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See detailUsing Models to Enable Compliance Checking against the GDPR: An Experience Report
Torre, Damiano UL; Soltana, Ghanem UL; Sabetzadeh, Mehrdad UL et al

in Proceedings of the IEEE / ACM 22nd International Conference on Model Driven Engineering Languages and Systems (MODELS 19) (2019, September)

The General Data Protection Regulation (GDPR) harmonizes data privacy laws and regulations across Europe. Through the GDPR, individuals are able to better control their personal data in the face of new ... [more ▼]

The General Data Protection Regulation (GDPR) harmonizes data privacy laws and regulations across Europe. Through the GDPR, individuals are able to better control their personal data in the face of new technological developments. While the GDPR is highly advantageous to citizens, complying with it poses major challenges for organizations that control or process personal data. Since no automated solution with broad industrial applicability currently exists for GDPR compliance checking, organizations have no choice but to perform costly manual audits to ensure compliance. In this paper, we share our experience building a UML representation of the GDPR as a first step towards the development of future automated methods for assessing compliance with the GDPR. Given that a concrete implementation of the GDPR is affected by the national laws of the EU member states, GDPR’s expanding body of case laws and other contextual information, we propose a two-tiered representation of the GDPR: a generic tier and a specialized tier. The generic tier captures the concepts and principles of the GDPR that apply to all contexts, whereas the specialized tier describes a specific tailoring of the generic tier to a given context, including the contextual variations that may impact the interpretation and application of the GDPR. We further present the challenges we faced in our modeling endeavor, the lessons we learned from it, and future directions for research. [less ▲]

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See detailCommunication with father and mother differently impacts suicidal behaviour
Catunda, Carolina UL; van Duin, Claire UL; Heinz, Andreas UL et al

Poster (2019, September)

Background: Positive relationships with parents can reduce the risk of suicidal behaviour in adolescents. Previous research has indicated that adolescents who report poor communication with their parents ... [more ▼]

Background: Positive relationships with parents can reduce the risk of suicidal behaviour in adolescents. Previous research has indicated that adolescents who report poor communication with their parents are more likely to display suicidal behaviour. The aim of this study is to find out whether communication with the father or mother is equally important for suicidal behaviour. Methods: A total of 5595 students aged from 12 to 18 years old in secondary school participated in the 2014 HBSC Luxembourg survey. They responded to a questionnaire including, among others: 4 questions regarding sadness, suicide ideation, planning and attempt, and 2 questions about ease of communication with their father and mother. Findings: Adolescents who indicate poorer communication with their mother or father have higher odds for all suicidal behaviours. Poor communication with fathers has a bigger influence on the odds for sadness, whereas poor communication with mothers has a bigger influence on the odds for attempted suicide. Lastly, adolescents who don`t have or don`t see their mother or father are at increased risk for the suicidal behaviours, although the odds are not as high as for those indicating very difficult communication with their parent(s). Discussion: The Luxembourgish findings confirm the results of previous research and go further showing that, as a determinant, communication with mother differs from the communication with father. More studies should confirm these findings and include other variables, such as social support and stress, in order to see their relation with the communication with both parental figures and suicidal behaviours. [less ▲]

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See detailTrends in cannabis consumption among youth in Luxembourg
Catunda, Carolina UL; van Duin, Claire UL; Heinz, Andreas UL et al

Scientific Conference (2019, September)

Background: Cannabis is the most widely consumed illegal drug worldwide. Among adolescents, cannabis use is a risk factor for cognitive decline, mental illness, social problems, and the use of other ... [more ▼]

Background: Cannabis is the most widely consumed illegal drug worldwide. Among adolescents, cannabis use is a risk factor for cognitive decline, mental illness, social problems, and the use of other psychoactive drugs. The current study presents trends in cannabis consumption among adolescents in Luxembourg. Methods: The Health Behaviour in School Aged Children (HBSC) Study in Luxembourg collected data in 2006, 2010, 2014 and 2018 using a standardized paper-pencil questionnaire. In total, 23,346 secondary schools students aged 11 to 18 years old (M=15.51, SD=1.53) responded to questions on cannabis, tobacco and alcohol consumption (lifetime and the past 30 days). Findings: In general, students who never used cannabis significantly increased over the four HBSC study waves (78%, 81.2%, 81%, 84%), whereas trends are similar for boys (74.5%, 77%, 78.2%, 81.4%), but not for girls (81.5%, 85%, 83.2%, 86.3%). Cannabis use (past 30 days) significantly differ for girls (94.1%, 94.1%, 92.8%, 93.7%), but not in general (91.7%, 92%, 90.9%, 91.7%), neither for boys (89.3%, 90.1%, 88.6%, 89.6%). Discussion: Cannabis lifetime use remains high for both genders. While consumption in the last 30 days remained stable for boys, it increased for girls over the past years. Tailored preventive interventions, based on health psychological models, are essential to educate adolescents about the social-cognitive risks of cannabis use and strengthen their capacities and resilience to resist experimental drug use and social pressure. In a context where legalization policies are discussed in various European countries, e-health approaches, for example, could be widely implemented in a cost-effective manner. [less ▲]

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See detailDie Stabilität von akademischen Selbstkonzept-Profilen: Befunde einer „latent transition analysis“
Franzen, Patrick UL; Arens, A Katrin; Niepel, Christoph UL

Scientific Conference (2019, September)

Nach dem „internal-external frame of reference“ Modell (Marsh, 1986), spielen u.a. dimensionale Vergleiche (Vergleich der eigenen Leistung in einem Fach mit der eigenen Leistung in einem anderen Fach ... [more ▼]

Nach dem „internal-external frame of reference“ Modell (Marsh, 1986), spielen u.a. dimensionale Vergleiche (Vergleich der eigenen Leistung in einem Fach mit der eigenen Leistung in einem anderen Fach) eine Rolle für die Ausbildung fachspezifischer akademischer Selbstkonzepte (ASKs). Dabei kommt es zu Kontrasteffekten: Eine gute Leistung in Mathematik stärkt das Mathematik-ASK, schwächt aber das Deutsch-ASK und vice versa. Schüler schätzen sich daher oft als fähiger in einem der beiden Fächer ein. Diese Typisierung ließ sich auch in personenzentrierten Ansätzen zeigen. Eine Profilanalyse von Marsh, Lüdtke, Trautwein und Morin (2009) ergab, dass ASK-Profile entweder einem Mathematik-Typ (höheres Mathe-ASK, niedrigeres Sprach-ASK), einem Sprach-Typ (niedrigeres Mathe-ASK, höheres Sprach-ASK) oder einem Mischtyp (gleich hohe ASKs in allen Domänen) folgten. Ob diese Profile über die Zeit hinweg stabil sind oder Schüler in Abhängigkeit ihrer Erfahrungen im Schulalltag zwischen den Typen wechseln können, ist bisher unklar. Ziel der vorliegenden Studie ist es, diese Frage zu beantworten. Eine Stichprobe von N = 382 Schülern aus 18 Klassen und vier Bundesländern beantwortete einen Fragebogen zum Mathematik-, Physik-, Deutsch- und Englisch-ASK an zwei Messzeitpunkten, mit einem Intervall von vier Wochen. Eine „latent transition analysis“ ergab eine Vier-State Lösung (BIC = 7797.8, Entropie = 0.884). Die vier States beschrieben einen Mathematik-Typ (höhere ASKs in Mathematik und Physik, niedrigere ASKs in Deutsch und Englisch), einen Sprach-Typ (höhere ASKs in Deutsch und Englisch, niedrigere ASKs in Mathematik und Physik), und zwei Mischtypen (gleich hohe ASKs für alle Fächer mit generell höheren ASKs bzw. niedrigeren ASKs). Die Ergebnisse zeigten eine hohe Stabilität der States: Alle Personen wurden an beiden Messzeitpunkten demselben State zugewiesen; die Transitionswahrscheinlichkeiten lagen bei 0% bis 5%. Weitere Ergebnisse zur Stabilität von ASK-Profilen bei noch kürzeren Zeitabständen, basierend auf „Experience Sampling“ Daten, werden diskutiert. Marsh, H.W. (1986). Verbal and math self-concepts: An internal/external frame of reference model. American Educational Research Journal, 23, 129-149. Marsh, H.W., Lüdtke, O., Trautwein, U., & Morin, A.J.S. (2009). Classical latent profile analysis of academic self-concept dimensions: Synergy of person- and variable-centered approaches to theoretical models of self-concept. Structural Equation Modeling, 16, 191–225. [less ▲]

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See detailCryptocurrencies and Blockchain Technology
Biryukov, Alex UL; García-Alfaro

in Data Privacy Management, Cryptocurrencies and Blockchain Technology - ESORICS 2019 International Workshops (2019, September)

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See detailMQLV: Optimal Policy of Money Management in Retail Banking with Q-Learning
Charlier, Jérémy Henri J. UL; Ormazabal, Gaston; State, Radu UL et al

in Proceedings of the Fourth Workshop on MIning DAta for financial applicationS (MIDAS 2019) co-located with the 2019 European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML-PKDD 2019) (2019, September)

Reinforcement learning has become one of the best approach to train a computer game emulator capable of human level performance. In a reinforcement learning approach, an optimal value function is learned ... [more ▼]

Reinforcement learning has become one of the best approach to train a computer game emulator capable of human level performance. In a reinforcement learning approach, an optimal value function is learned across a set of actions, or decisions, that leads to a set of states giving different rewards, with the objective to maximize the overall reward. A policy assigns to each state-action pairs an expected return. We call an optimal policy a policy for which the value function is optimal. QLBS, Q-Learner in the Black-Scholes(-Merton) Worlds, applies the reinforcement learning concepts, and noticeably, the popular Q-learning algorithm, to the financial stochastic model of Black, Scholes and Merton. It is, however, specifically optimized for the geometric Brownian motion and the vanilla options. Its range of application is, therefore, limited to vanilla option pricing within the financial markets. We propose MQLV, Modified Q-Learner for the Vasicek model, a new reinforcement learning approach that determines the optimal policy of money management based on the aggregated financial transactions of the clients. It unlocks new frontiers to establish personalized credit card limits or bank loan applications, targeting the retail banking industry. MQLV extends the simulation to mean reverting stochastic diffusion processes and it uses a digital function, a Heaviside step function expressed in its discrete form, to estimate the probability of a future event such as a payment default. In our experiments, we first show the similarities between a set of historical financial transactions and Vasicek generated transactions and, then, we underline the potential of MQLV on generated Monte Carlo simulations. Finally, MQLV is the first Q-learning Vasicek-based methodology addressing transparent decision making processes in retail banking. [less ▲]

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See detailBridging the Gap between Requirements Modeling and Behavior-driven Development
Alferez, Mauricio UL; Pastore, Fabrizio UL; Sabetzadeh, Mehrdad UL et al

in Proceedings of 22nd IEEE / ACM International Conference on Model Driven Engineering Languages and Systems (MODELS) (2019, September)

Acceptance criteria (AC) are implementation agnostic conditions that a system must meet to be consistent with its requirements and be accepted by its stakeholders. Each acceptance criterion is typically ... [more ▼]

Acceptance criteria (AC) are implementation agnostic conditions that a system must meet to be consistent with its requirements and be accepted by its stakeholders. Each acceptance criterion is typically expressed as a natural-language statement with a clear pass or fail outcome. Writing AC is a tedious and error-prone activity, especially when the requirements specifications evolve and there are different analysts and testing teams involved. Analysts and testers must iterate multiple times to ensure that AC are understandable and feasible, and accurately address the most important requirements and workflows of the system being developed. In many cases, analysts express requirements through models, along with natural language, typically in some variant of the UML. AC must then be derived by developers and testers from such models. In this paper, we bridge the gap between requirements models and AC by providing a UML-based modeling methodology and an automated solution to generate AC. We target AC in the form of Behavioral Specifications in the context of Behavioral-Driven Development (BDD), a widely used agile practice in many application domains. More specially we target the well-known Gherkin language to express AC, which then can be used to generate executable test cases. We evaluate our modeling methodology and AC generation solution through an industrial case study in the financial domain. Our results suggest that (1) our methodology is feasible to apply in practice, and (2) the additional modeling effort required by our methodology is outweighed by the benefits the methodology brings in terms of automated and systematic AC generation and improved model precision. [less ▲]

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See detailDifferent load‐bearing mechanisms in headed stud shear connections in composite beams with profiled steel sheeting
Vigneri, Valentino UL; Odenbreit, Christoph UL; Lam, Dennis

in ce/papers (2019, September), 3(3-4), 231-236

The current regulations of EN1994-1-1 for headed stud shear connections in composite beams with profiled sheeting lead, for some configurations, to an over-estimation of the load-bearing capacity. Since ... [more ▼]

The current regulations of EN1994-1-1 for headed stud shear connections in composite beams with profiled sheeting lead, for some configurations, to an over-estimation of the load-bearing capacity. Since these design equations are based on empirical considerations, they are not able to capture the real mechanical behaviour of the connector and they do not consider appropriately the influence of the geometry of sheeting on the shear capacity. For this reason, the load-bearing mechanisms of the shear connection are identified in this work with the support of experimental and numerical results. According to the static system presented, the concrete rib is modelled as a system of diagonal struts acting simultaneously in combination with the stud in bending. It is observed that at 2÷4 mm slip, a ?Strut and beam? mechanism prevails where the resistance of the connector depends mostly on the plastic hinges activated in the stud and on the capacity of the diagonal strut in front of it. By increasing the slip (ca. 4÷10 mm), the surrounding concrete progressively crushes while the tensile stresses at the edge of the rib reach the tensile strength of the material. As a consequence of this loss of rotational stiffness, the bending capacity developed in the stud reduces and the upper hinges gradually moves towards the slab. At higher displacements (ca. 20÷40 mm), due to nonlinear geometric effects, high tensile forces develop in the stud and the load is carried through a ?Strut and Tie? resistance mechanism, if the embedment of the stud is sufficient. By further increasing the slip, the whole rib rotates or the failure occurs either for concrete pull-out or stud rupture. This contribution describes the sequence of the activated load-bearing mechanisms in headed stud shear connections with profiled steel sheeting at different displacements. [less ▲]

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See detailDifferences between students’ and teachers’ fairness perceptions: Exploring the potential of a self-administered questionnaire to improve teachers’ assessment practices
Sonnleitner, Philipp UL; Kovacs, Carrie

Scientific Conference (2019, September)

The ability to assess learning outcomes is vital to effective teaching. Without understanding what students have learned, it is impossible to tailor information, tasks or feedback adequately to their ... [more ▼]

The ability to assess learning outcomes is vital to effective teaching. Without understanding what students have learned, it is impossible to tailor information, tasks or feedback adequately to their individual needs. Thus, so-called assessment literacy has been increasingly recognized as a core teacher competency in educational research, with many empirical studies investigating teachers’ abilities, knowledge and subjective views in relation to classroom assessment. In contrast, relatively few studies have focused on students’ perspectives of assessment. This is surprising, since gathering students’ feedback on their teachers’ assessment practices seems a logical step toward improving those practices. To help fill this gap, we present an explorative study using the recently developed Fairness Barometer as a tool to help identify specific strengths and weaknesses in individual teachers’ assessment methods. Viewing assessment through the lens of classroom justice theory, the Fairness Barometer asks students and teachers to rate aspects of procedural and informational justice in their own (teachers’) classroom assessment practices. We examined the resulting fairness discrepancy profiles for 10 Austrian secondary school classes (177 students). Results showed wide variation in profile pattern, evidence that both students and teachers can differentiate between different aspects of assessment fairness. Further exploration of the resulting discrepancy-profiles revealed certain problem types with some teachers differing from their students’ perception in almost every rated aspect, some showing specific assessment-related behaviors that require improvement (e.g. explaining grading criteria of oral exams), and others demonstrating almost identical responses as their students to the addressed fairness aspects. Results clearly indicate the potential of the Fairness Barometer to be used for teacher training and teacher self-development within the domain of teacher assessment literacy. [less ▲]

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See detailJoint User Grouping and Power Allocation for MISO Systems: Learning to Schedule
Yuan, Yaxiong; Vu, Thang Xuan UL; Lei, Lei UL et al

in IEEE European Signal Processing Conference 2019 (2019, September)

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See detailAutomated evaluation of embedded-system design alternatives
Cordy, Maxime UL; Lazreg, Sami

in Proceedings of the 23rd International Systems and Software Product Line Conference, SPLC 2019, Volume A, Paris, France, September 9-13, 2019 (2019, September)

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See detailAssociations between perceived discrimination and life satisfaction: An ecological momentary assessment pilot study of adolescents
Stogianni, Maria UL; Murdock, Elke UL

Poster (2019, August 31)

Perceived discrimination is an important predictor of life satisfaction in ethnic minority groups (Villegas-Gold & Hyung Chol Yoo, 2014). Discriminatory practices are related to lower levels of subjective ... [more ▼]

Perceived discrimination is an important predictor of life satisfaction in ethnic minority groups (Villegas-Gold & Hyung Chol Yoo, 2014). Discriminatory practices are related to lower levels of subjective well-being and greater anxiety (Clark, Anderson, Clark, & Williams, 1999). The present study aims to extend these findings by assessing the affective consequences of perceived discrimination with the use of experience sampling methodology. We are interested in within person changes in subjective well-being that occur as a result of perceived discrimination. International high-school students (N = 30) attending at European school of Luxembourg were recruited to participate in an e-diary study for a period of 10 days. Participants were first and second generation immigrants (Mage = 14.63, SD = .62) from different European and non-European countries, growing up in multicultural Luxembourg. Perceptions of discrimination by peers and teachers were assessed with a self-report questionnaire daily after school. Our measures captured different experiences of discrimination including discrimination based on gender, social status, ethnic origin, and physical appearance. Each evening, participants completed the Brief Multidimensional Students’ Life Satisfaction Scales (BMSLSS), which assesses satisfaction with life in general and satisfaction in five domains that are considered important for adolescents: self, family, friends, living environment, and school context. The findings suggest that experiences of discrimination were associated with lower levels of subjective well-being. Participants were less satisfied with themselves, their relationships, and their school environment during the days they reported higher levels of discrimination experiences. With this pilot study using ecological momentary assessment, we develop a more dynamic understanding of the within-person variability of different facets of well-being among first and second generation adolescent immigrants and their discrimination experiences in different domains. [less ▲]

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See detailARCHITECTURES AND SYNCHRONIZATION TECHNIQUES FOR COHERENT DISTRIBUTED REMOTE SENSING SYSTEMS
Merlano Duncan, Juan Carlos UL; Querol Borras, Jorge UL; Camps, Adriano et al

in 2019 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) (2019, August 31)

Phase, frequency and time synchronization is a crucial requirement for many applications as such as multi-static remote sensing and distributed beamforming for communications. The literature on the field ... [more ▼]

Phase, frequency and time synchronization is a crucial requirement for many applications as such as multi-static remote sensing and distributed beamforming for communications. The literature on the field is very wide, and in some cases, the requirements of the proposed synchronization solution may surpass the ones set by the application itself. Moreover, the synchronization solution becomes even more challenging when the nodes are flying or hovering on aerial or space platforms. In this work, we compare and classify the synchronization technologies available in the literature according to a common proposed framework, and we discuss the considerations of an implementation for distributed remote sensing applications. The general framework considered is based on a distributed collection of autonomous nodes that try to synchronize their clocks with a common reference. Moreover, they can be classified in non-overlapping, adjacent and overlapping frequency band scenarios [less ▲]

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See detailEffect of firm regulatory focus on risk disclosure: Evidence from UK strategic reports
Weber, Véronique UL

Scientific Conference (2019, August 29)

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See detailAn Approximate Solution for Symbol-Level Multiuser Precoding Using Support Recovery
Haqiqatnejad, Alireza UL; Kayhan, Farbod UL; Ottersten, Björn UL

in IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Cannes 2-5 July 2019 (2019, August 29)

In this paper, we propose a low-complexity method to approximately solve the SINR-constrained optimization problem of symbol-level precoding (SLP). First, assuming a generic modulation scheme, the ... [more ▼]

In this paper, we propose a low-complexity method to approximately solve the SINR-constrained optimization problem of symbol-level precoding (SLP). First, assuming a generic modulation scheme, the precoding optimization problem is recast as a standard non-negative least squares (NNLS). Then, we improve an existing closed-form SLP (CF-SLP) scheme using the conditions for nearly perfect recovery of the optimal solution support, followed by solving a reduced system of linear equations. We show through simulation results that in comparison with the CF-SLP method, the improved approximate solution of this paper, referred to as ICF-SLP, significantly enhances the performance with a negligible increase in complexity. We also provide comparisons with a fast-converging iterative NNLS algorithm, where it is shown that the ICF-SLP method is comparable in performance to the iterative algorithm with a limited maximum number of iterations. Analytic discussions on the complexities of different methods are provided, verifying the computational efficiency of the proposed method. Our results further indicate that the ICF-SLP scheme performs quite close to the optimal SLP, particularly in the large system regime. [less ▲]

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See detailModelling of interfacial crack propagation in strongly heterogeneous materials by using phase field method
Nguyen, Thanh-Tung; Yvonnet, Julien; Waldmann, Danièle UL et al

in Proceedings of the 8th GACM Colloquium on Computational Mechanics for Young Scientists from Academia and Industry (2019, August 28)

Phase field model has been proved to be a useful tool to study the fracture behaviors in heterogeneous materials. This method is able to model complex, multiple crack fronts, and branching in both 2D/3D ... [more ▼]

Phase field model has been proved to be a useful tool to study the fracture behaviors in heterogeneous materials. This method is able to model complex, multiple crack fronts, and branching in both 2D/3D without ad-hoc numerical treatments. In this study, a new interfacial cracking model in the phase field framework is proposed. The effects of both stiff and soft interphases on the fracture response of composite materials are considered. A dimensional-reduced model based on a rigorous asymptotic analysis is adapted to derive the null thickness imperfect interface models from an original configuration containing thin interphase. The idea of mixing the bulk and interfacial energy within the phase field framework is then used to describe the material degradation both on the interface and in bulk. Moreover, in order to ensure the physical crack propagation patterns, a unilateral contact condition is also proposed for the case of spring imperfect interface. The complex cracking phenomena on interfaces such as initiation, delamination, coalescence, deflection, as well as the competition between the interface and bulk cracking are successfully predicted by the present method. Concerning the numerical aspect, the one-pass staggered algorithm is adapted, providing an extremely robust approach to study interfacial cracking phenomena in a broad class of heterogeneous materials. [less ▲]

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See detailFear and Euphoria
Lehnert, Thorsten UL

Scientific Conference (2019, August 28)

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See detailPotential of the Deformation Area Difference (DAD)-Method for Condition Assessment of Bridge Structures
Waldmann, Danièle UL; Erdenebat, Dolgion UL

Scientific Conference (2019, August 27)

The construction industry ranks in the back rows in terms of digitalization. The numerous existing bridge structures require considerable effort for inspection and reliable assessment of their condition ... [more ▼]

The construction industry ranks in the back rows in terms of digitalization. The numerous existing bridge structures require considerable effort for inspection and reliable assessment of their condition. However, the state-of-the-art for inspecting these structures still relies on the visual inspection realized by bridge inspectors. The current paper summarizes several research projects in the field of condition assessment of bridge structures at the University of Luxembourg by analysing the structural response due to dynamic excitation and static loading tests. The latest development aims at using the most modern measurement techniques by combining them to a new method, the Deformation Area Difference (DAD)-Method in order to simplify and automatize at most the inspection process. The proposed DAD-Method is based on conventional static load deflection tests. It allows the localization of stiffness-reducing damage by using a very precise measurement of the deflection line and by combining this outcome to the deflection line generated by a simplified finite element model of the bridge. In order to investigate the condition of a bridge by the DAD-Method modern measurement techniques such as photogrammetry and laser scanning are used. In the framework of the conducted research, these techniques are also compared to traditional measurement systems such as total station and inductive displacement sensors as well as to digital levelling sensors. By theoretical examples and experimental tests, it can be shown that the DAD-Method is able to detect and localize damage when the damage level is dominant on the measurement noise. This paper investigates also the application of the method on a real bridge structure in Luxembourg. All of the above-mentioned measurement techniques were used, whereby the photogrammetry is applied using both, stable tripods and an autonomous flying drone. This allows examining the accuracy of the different measurement systems when applied on a real-size structure. [less ▲]

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See detailTowards context-aware automated writing evaluation systems
Patout, Pierre-André; Cordy, Maxime UL

in Proceedings of the 1st ACM SIGSOFT International Workshop on Education through Advanced Software Engineering and Artificial Intelligence, EASEAI@ESEC/SIGSOFT FSE 2019, Tallinn, Estonia, August 26, 2019 (2019, August 26)

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See detailHarnessing Higher-Order (Meta-)Logic to Represent and Reason with Complex Ethical Theories
Fuenmayor, David; Benzmüller, Christoph UL

in Nayak, A.; Sharma, A. (Eds.) PRICAI 2019: Trends in Artificial Intelligence (2019, August 23)

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See detailFaster Visual-Based Localization with Mobile-PoseNet
Cimarelli, Claudio UL; Cazzato, Dario UL; Olivares Mendez, Miguel Angel UL et al

in International Conference on Computer Analysis of Images and Patterns (2019, August 22)

Precise and robust localization is of fundamental importance for robots required to carry out autonomous tasks. Above all, in the case of Unmanned Aerial Vehicles (UAVs), efficiency and reliability are ... [more ▼]

Precise and robust localization is of fundamental importance for robots required to carry out autonomous tasks. Above all, in the case of Unmanned Aerial Vehicles (UAVs), efficiency and reliability are critical aspects in developing solutions for localization due to the limited computational capabilities, payload and power constraints. In this work, we leverage novel research in efficient deep neural architectures for the problem of 6 Degrees of Freedom (6-DoF) pose estimation from single RGB camera images. In particular, we introduce an efficient neural network to jointly regress the position and orientation of the camera with respect to the navigation environment. Experimental results show that the proposed network is capable of retaining similar results with respect to the most popular state of the art methods while being smaller and with lower latency, which are fundamental aspects for real-time robotics applications. [less ▲]

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See detailTowards an understanding of biculturalism: The dynamic tension of being bicultural
Murdock, Elke UL

Scientific Conference (2019, August 22)

One facet of contemporary societies is their increasingly diverse composition – a consequence of accelerated movement of people across the globe. There is a growing number of individuals who are living ... [more ▼]

One facet of contemporary societies is their increasingly diverse composition – a consequence of accelerated movement of people across the globe. There is a growing number of individuals who are living with more than one cultural influence. This requires new theoretical understanding of biculturalism. How do individuals with significant and prolonged second culture exposure negotiate their cultural identities? Past research has relied on additive models, which conceptualize biculturalism simply as the sum of their cultural experiences, emphasizing the relative influence of each culture. The transformative theory of biculturalism goes beyond this model by focusing on the process of negotiation (hybridization, integrating and frame switching) recognizing that this process itself is already transforming the cultural experience. I will present a theory of biculturalism as a self-stabilizing tensegrity network. Previous models fall short in understanding the process of bicultural identity construal. Building on Dialogical Self theory and the idea of tensional integrity or tensegrity (Marsico & Tateo, 2017) I will show how applying such a framework captures the everyday reality of those living in a boundary-crossing world. Human beings are involved in constant positioning and counter-positioning the forms of which go beyond simple dual systems views – a co-genetic logic being more appropriate allowing for a third way. Tension may lead to a dialectical synthesis—a concept that will be elaborated in concrete ways. Tension is viewed as a positive force, stabilizing the self and at the same time dynamic allowing for the emergence of a qualitatively new whole. [less ▲]

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See detailForging and Paving a Future: Immigrant Status and Academic Achievement in Luxembourg
Rivas, Salvador UL; Reichel, Yanica UL; Krämer, Charlotte UL et al

Scientific Conference (2019, August 21)

In the United States, much has been written about the upward or downward social mobility of the so-called, “New Second Generation”. In Europe, this topic has only recently begun to take shape; mostly in ... [more ▼]

In the United States, much has been written about the upward or downward social mobility of the so-called, “New Second Generation”. In Europe, this topic has only recently begun to take shape; mostly in regard to the Netherlands, Germany, France and the UK. In the context of Luxembourg, however, there is very little literature on this topic even though nearly 50% of its population is now of immigrant status. Though small in geography and population, Luxembourg is a founding member of the E.U. and quite literally in the heart of continental Europe. It hosts a diverse set of immigrant groups, continuously attracting economic and some political immigrants, most notably from Italy, the former Yugoslavia and Portugal. Each of these groups arriving at a specific sociohistorical moment: Italians at the height of the steel industry, former Yugoslavians fleeing war, and Portuguese to meet construction and service industry needs. Consequently, Luxembourg is truly a multilingual and multicultural country that makes for a fascinating microcosm to test and explore existing theories of immigrant integration. Its context presents a unique opportunity to study and extrapolate from to anticipate the needs of immigrants elsewhere. Using 2016 data from Luxembourg’s school monitoring programme (ÉpStan), we investigate existing and emerging differences in academic achievement among 1st, 2nd, and later generation immigrant groups in Luxembourg. We analyse math and language proficiencies (German and French) among a cohort of secondary school students (9th grade, N=6286). Preliminary results indicate clear generational differences. These are interpreted in relation to immigrant group characteristics and acculturation in Luxembourg. Implications for the new second generation in the European context will be discussed. [less ▲]

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See detailA new model selection criterion for finite mixture models
Schiltz, Jang UL

in Proceedings of the 62nd ISI World Statistics Congress (2019, August 20)

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See detailPANAS- Project: Heat Transfer Model Development for Passive Safety Systems,
Leyer, Stephan UL; Hampel; Schuster, C et al

in NURETH-18 (2019, August 18)

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See detailDimensional Comparison Effects on Facets of Subject-Specific Anxieties: A Nested Modelling Approach
Talic, Irma UL; Sparfeldt, Jörn; Möller, Jens et al

Scientific Conference (2019, August 16)

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See detailAssimilation and Contrast Effects of Dimensional Comparisons in Self-Concepts, Interests & Anxieties
van der Westhuizen, Lindie UL; Arens, Katrin; Greiff, Samuel UL et al

Scientific Conference (2019, August 16)

Research on the internal/external frame of reference (I/E) model has frequently found contrast effects of dimensional comparisons (i.e. a negative relationship between achievement and self-concept across ... [more ▼]

Research on the internal/external frame of reference (I/E) model has frequently found contrast effects of dimensional comparisons (i.e. a negative relationship between achievement and self-concept across domains) between math and verbal domains. The generalised internal/external frame of reference (GI/E) model extends the I/E model to multiple domains including multiple languages and to other academic self-beliefs and attitudes. When considering multiple languages, achievement-self-concept relations across languages have been found to be either negative (i.e. contrast effect), positive (i.e. assimilation effect), or non-significant. The present study contributes to the ongoing debate concerning the effect of dimensional comparisons among languages by (1) examining dimensional comparisons across two languages and (2) extending the examination to interest and anxiety as outcome variables beyond self-concept. We analysed domain-specific self-concepts, interest, anxieties, and achievement regarding French, German and math in a representative sample (N=5,789) of Luxembourgish ninth-graders. Findings indicated (1) clear contrast effects in the formation of self-concept and interest in German, French and math, and (2) a combination of contrast, assimilation and/or no effects in the formation of anxiety in math, German, and French. With regard to the latter, contrast effects were found for achievement-anxiety paths from German to French, French to German, and French to math. Achievement-anxiety paths from math to French and German to math were non-significant, while the path from math achievement to German anxiety showed a small, yet significant assimilation effect. Results are contextualised within the multilingual Luxembourgish educational system and implications for research on dimensional comparisons are discussed. [less ▲]

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See detailImplementing intelligence facets as predictors into the generalised I/E model
Hausen, Jennifer UL; Möller, Jens; Greiff, Samuel UL et al

Scientific Conference (2019, August 13)

The internal/external (I/E) frame of reference model postulates that achievement influences the formation of academic self-concept (ASC) via social and dimensional comparison processes. Its recent ... [more ▼]

The internal/external (I/E) frame of reference model postulates that achievement influences the formation of academic self-concept (ASC) via social and dimensional comparison processes. Its recent extension as the generalized I/E model allows further domains than math and verbal achievement. However, intelligence facets as an indicator of achievement have been neglected within the GI/E model framework. Therefore, the purpose of this research is to explore the influences of three intelligence facets (verbal, numerical, figural) on domain-specific ASCs beyond grades and achievement scores. We drew on N=382 German students to analyze verbal, numerical, and figural intelligence, German and math achievement, self-reported grades and ASCs in four domains. We performed a structural equation model using Mplus with grades, achievement scores and intelligence facets specified as predictors and domain-specific ASCs as criteria. Positive paths were found from math, physics, German and English grade to their corresponding self-concepts. A positive path was found between physics grade and math ASC while negative paths were found from English grade to math and physics ASC and from math grade to German, physics and English ASC. The path coefficients from math achievement to math ASC as well as to physics ASC were positive; German achievement was negatively related to math ASC. Lastly, numerical intelligence was positively related to physics ASC, and verbal intelligence was positively related to English ASC. Thus, intelligence, specifically numerical and verbal intelligence, seem to be valid predictors of domain-specific ACSs beyond grades and achievement test scores. [less ▲]

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See detailThe Long 19th Century of Music in Luxembourg. Music History, Sociology and Ethnology
Sagrillo, Damien UL

Scientific Conference (2019, August 09)

Music historiography is multifaceted. The historiography of music in Luxembourg is divided into various aspects. Firstly, it is part of regional music research in Europe and, as far as Luxembourg is ... [more ▼]

Music historiography is multifaceted. The historiography of music in Luxembourg is divided into various aspects. Firstly, it is part of regional music research in Europe and, as far as Luxembourg is concerned, national music research. A first point of view is music ethnology: citizens, nations have their songs and pass them on orally across national and linguistic borders and over generations. Folksongs originate from the music of the people, and patriotic music in Luxembourg is often music based on folksong styles. A further aspect of music in Luxembourg is that art music originated since the independence of the Grand Duchy in the 19th century. Sociological considerations deal with community music in Luxembourg. The starting point is a more liberal constitution, which for the first time offered citizens the right of assembly. Finally, my lecture will offer some insights of musical activities of people who left their homeland. [less ▲]

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See detailDatabase Processing-in-Memory: A Vision
Kepe, Tiago rodrigo; Almeida, Eduardo Cunha; Alves, Marcos A.Z. et al

in Database Processing-in-Memory: A Vision (2019, August 03)

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See detailFirst Reflections on Identity Constructions of International Mobiles based on Data of from the German Emigration and Remigration Panel Study (GERPS)
Decieux, Jean Philippe Pierre UL

Scientific Conference (2019, August)

International mobile persons usually live in multicultural contexts and have frequent opportunities for cultural contact. They live for example in mixed-national households or interact with different ... [more ▼]

International mobile persons usually live in multicultural contexts and have frequent opportunities for cultural contact. They live for example in mixed-national households or interact with different cultures in their everyday live. An interesting question is how they organize and experience their nationalities, identities and feelings of belongings and how these develop over time. Based on data from the first two waves of the new and unique German Emigration and Remigration Panel Study (GERPS) the paper tries to answer the following questions: How are the identities and belongings experienced? Do they self-identify in a mono- or bi or transcultural way, and what factors (sociodemographic, personality) contribute to either identification? GERPS will provide information on approximately 11.000 international mobile individuals which have recently emigrated from Germany to any other country in the world or recently re-migrated to Germany. As GERPS is a panel study, I will be able to present first results concerning developments and changes over time, which is important as modern theories reflect identity and cultural construction as dynamic negotiation processes. [less ▲]

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See detailKeynote lecture: Potential of the Deformation Area Difference (DAD)-Method for Condition Assessment of Bridge Structures
Waldmann, Danièle UL; Erdenebat, Dolgion

in Proceedings of SMAR 2019 - Fifth Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures (2019, August)

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See detailGet to know your geek: towards a sociological understanding
Karadeniz, Oguz Özgür; Schiffner, Stefan UL

in Data for Better Living: AI and Privacy (2019, August)

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See detailiFixR: bug report driven program repair
Koyuncu, Anil UL; Liu, Kui UL; Bissyande, Tegawendé François D Assise UL et al

in ESEC/FSE 2019 Proceedings of the 2019 27th ACM Joint Meeting on European Software Engineering Conference and Symposium on the Foundations of Software Engineering (2019, August)

Issue tracking systems are commonly used in modern software development for collecting feedback from users and developers. An ultimate automation target of software maintenance is then the systematization ... [more ▼]

Issue tracking systems are commonly used in modern software development for collecting feedback from users and developers. An ultimate automation target of software maintenance is then the systematization of patch generation for user-reported bugs. Although this ambition is aligned with the momentum of automated program repair, the literature has, so far, mostly focused on generate-and- validate setups where fault localization and patch generation are driven by a well-defined test suite. On the one hand, however, the common (yet strong) assumption on the existence of relevant test cases does not hold in practice for most development settings: many bugs are reported without the available test suite being able to reveal them. On the other hand, for many projects, the number of bug reports generally outstrips the resources available to triage them. Towards increasing the adoption of patch generation tools by practitioners, we investigate a new repair pipeline, iFixR, driven by bug reports: (1) bug reports are fed to an IR-based fault localizer; (2) patches are generated from fix patterns and validated via regression testing; (3) a prioritized list of generated patches is proposed to developers. We evaluate iFixR on the Defects4J dataset, which we enriched (i.e., faults are linked to bug reports) and carefully-reorganized (i.e., the timeline of test-cases is naturally split). iFixR generates genuine/plausible patches for 21/44 Defects4J faults with its IR-based fault localizer. iFixR accurately places a genuine/plausible patch among its top-5 recommendation for 8/13 of these faults (without using future test cases in generation-and-validation). [less ▲]

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See detailGenerating Automated and Online Test Oracles for Simulink Models with Continuous and Uncertain Behaviors
Menghi, Claudio UL; Nejati, Shiva UL; Gaaloul, Khouloud UL et al

in Proceedings of the 27th ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE ’19), (2019, August)

Test automation requires automated oracles to assess test outputs. For cyber physical systems (CPS), oracles, in addition to be automated, should ensure some key objectives: (i) they should check test ... [more ▼]

Test automation requires automated oracles to assess test outputs. For cyber physical systems (CPS), oracles, in addition to be automated, should ensure some key objectives: (i) they should check test outputs in an online manner to stop expensive test executions as soon as a failure is detected; (ii) they should handle time- and magnitude-continuous CPS behaviors; (iii) they should provide a quantitative degree of satisfaction or failure measure instead of binary pass/fail outputs; and (iv) they should be able to handle uncertainties due to CPS interactions with the environment. We propose an automated approach to translate CPS requirements specified in a logic-based language into test oracles specified in Simulink - a widely-used development and simulation language for CPS. Our approach achieves the objectives noted above through the identification of a fragment of Signal First Order logic (SFOL) to specify requirements, the definition of a quantitative semantics for this fragment and a sound translation of the fragment into Simulink. The results from applying our approach on 11 industrial case studies show that: (i) our requirements language can express all the 98 requirements of our case studies; (ii) the time and effort required by our approach are acceptable, showing potentials for the adoption of our work in practice, and (iii) for large models, our approach can dramatically reduce the test execution time compared to when test outputs are checked in an offline manner. [less ▲]

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See detailA Lightweight Implementation of NTRUEncrypt for 8-bit AVR Microcontrollers
Cheng, Hao UL; Groszschädl, Johann UL; Roenne, Peter UL et al

Scientific Conference (2019, August)

Introduced in 1996, NTRUEncrypt is not only one of the earliest but also one of the most scrutinized lattice-based cryptosystems and a serious contender in NIST’s ongoing Post-Quantum Cryptography (PQC ... [more ▼]

Introduced in 1996, NTRUEncrypt is not only one of the earliest but also one of the most scrutinized lattice-based cryptosystems and a serious contender in NIST’s ongoing Post-Quantum Cryptography (PQC) standardization project. An important criterion for the assessment of candidates is their computational cost in various hardware and software environments. This paper contributes to the evaluation of NTRUEncrypt on the ATmega class of AVR microcontrollers, which belongs to the most popular 8-bit platforms in the embedded domain. More concretely, we present AvrNtru, a carefully-optimized implementation of NTRUEncrypt that we developed from scratch with the goal of achieving high performance and resistance to timing attacks. AvrNtru complies with version 3.3 of the EESS#1 specification and supports recent product-form parameter sets like ees443ep1, ees587ep1, and ees743ep1. A full encryption operation (including mask generation and blinding- polynomial generation) using the ees443ep1 parameters takes 834,272 clock cycles on an ATmega1281 microcontroller; the decryption is slightly more costly and has an execution time of 1,061,683 cycles. When choosing the ees743ep1 parameters to achieve a 256-bit security level, 1,539,829 clock cycles are cost for encryption and 2,103,228 clock cycles for decryption. We achieved these results thanks to a novel hybrid technique for multiplication in truncated polynomial rings where one of the operands is a sparse ternary polynomial in product form. Our hybrid technique is inspired by Gura et al’s hybrid method for multiple-precision integer multiplication (CHES 2004) and takes advantage of the large register file of the AVR architecture to minimize the number of load instructions. A constant-time multiplication in the ring specified by the ees443ep1 parameters requires only 210,827 cycles, which sets a new speed record for the arithmetic component of a lattice-based cryptosystem on an 8-bit microcontroller. [less ▲]

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See detailValue-added modeling in primary school: What covariates to include?
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Scientific Conference (2019, August)

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See detailChapter 18: Luxembourg
Sinnig, Julia UL

in Maisto, Guglielmo (Ed.) New Trends in the Definition of Permanent Establishment (2019, August)

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See detailM-QAM Modulation Symbol-Level Precoding for Power Minimization: Closed-Form Solution
Krivochiza, Jevgenij UL; Merlano Duncan, Juan Carlos UL; Chatzinotas, Symeon UL et al

Scientific Conference (2019, August)

In this paper, we derive a closed-form algorithm of the computationally efficient Symbol-Level Precoding (SLP) for power efficient communications when using M-QAM modulated waveforms. The channel state ... [more ▼]

In this paper, we derive a closed-form algorithm of the computationally efficient Symbol-Level Precoding (SLP) for power efficient communications when using M-QAM modulated waveforms. The channel state information (CSI) based and data-aided SLP technique optimizes power efficiency by solving a non-negative convex quadratic optimization problem per time frame of transmitted symbols. The optimization combines constructive inter-user interference to minimize the sum power of precoded symbols at the transmitter side under constraints for minimum SNR at the receiver side. The SLP implementation incurs extra computational complexity of the transmitter. We propose a convex quadratic optimization problem for M-QAM constellations and derive a closed-form algorithm with a fixed number of iterations to solve the problem. [less ▲]

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See detailPresent-Day Land and Sea Level Changes around South Georgia Island: Results from Precise Levelling, GNSS, Tide Gauge and Satellite Altimetry Measurements
Teferle, Felix Norman UL; Dalziel, I W D; Hunegnaw, Addisu UL et al

Scientific Conference (2019, July 25)

South Georgia Island, the main land outcrop on the South Georgia microcontinent (SGM), is located approximately 1,400 km east of the Falkland Islands and approximately 1,400 km northeast of the ... [more ▼]

South Georgia Island, the main land outcrop on the South Georgia microcontinent (SGM), is located approximately 1,400 km east of the Falkland Islands and approximately 1,400 km northeast of the northernmost tip of the Antarctic peninsular. The SGM is believed to lie south of the North Scotia Ridge (NSR), which forms the boundary to the South America Plate, while to the south it is bordered by the Scotia Plate (SP). In its sub-Antarctic location, the island is largely covered by mountain glaciers which have been reported to be retreating due to climatic change. Furthermore, during past glaciation periods the island and its shelf area, stretching much of the SGM, have been ice covered as was revealed by scarring of the sub-oceanic topography. Together with ongoing tectonics along the NSR and recent seismicity at the SP boundary, these processes have the ability to produce significant uplift on local to regional scales. With its mid-ocean location in the Southern Atlantic Ocean South Georgia Island is in a key position for the oceanic and geodetic global monitoring networks. As these net-works suffer from a Hemisphere imbalance with the number of stations in the Northern Hemisphere outnumbering those in the Southern Hemisphere, operating these stations to the highest standards is of key scientific value. It is of particular interest to monitor the tide gauge (GLOSS ID 187) at King Edward Point (KEP) for vertical land movements to establish a continuous record of its datum within the Permanent Service for Mean Sea Level (PSMSL), which in turn makes it useful for long-term sea level studies and satellite altimetry calibrations. With the establishment of five GNSS stations on the islands by teams from Luxembourg, the UK and the USA during 2013 to 2015, and the scientific analysis of these data within a global network of stations, it has now become possible to study present-day vertical land movements and their impacts. Furthermore, together with four precise levelling campaigns of the KEP benchmark network in 2013, 2014 and two in 2017, it has also been possible to investigate the very local character of the vertical motions near KEP, i.e. the stability of the jetty upon which the tide gauge is mounted. In this study, we will present the still preliminary results from the GNSS and levelling measurements and will discuss their impact on the sea level record from the KEP tide gauge. Our measurements show that while South Georgia Island and the area around KEP are rising, the jetty and tide gauge are subsiding, leading to a lower magnitude of the observed sea level change than expected from satellite altimetry. In order to improve the agreement between these measurements both local and regional vertical land movements need to be monitored. [less ▲]

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See detailOn idempotent n-ary uninorms
Devillet, Jimmy UL; Kiss, Gergely; Marichal, Jean-Luc UL

in Torra, Vicenç; Narukawa, Yasuo; Pasi, Gabriella (Eds.) et al Modeling Decisions for Artifical Intelligence (2019, July 24)

In this paper we describe the class of idempotent n-ary uninorms on a given chain.When the chain is finite, we axiomatize the latter class by means of the following conditions: associativity ... [more ▼]

In this paper we describe the class of idempotent n-ary uninorms on a given chain.When the chain is finite, we axiomatize the latter class by means of the following conditions: associativity, quasitriviality, symmetry, and nondecreasing monotonicity. Also, we show that associativity can be replaced with bisymmetry in this new axiomatization. [less ▲]

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See detailBracketing in student writing: its uses (and abuses)
Deroey, Katrien UL

Scientific Conference (2019, July 23)

This paper reports on the use of bracketed text in a large corpus of student writing. The function of bracketing has been neglected in academic writing research and coursebooks. Yet it is closely related ... [more ▼]

This paper reports on the use of bracketed text in a large corpus of student writing. The function of bracketing has been neglected in academic writing research and coursebooks. Yet it is closely related to important text construction issues such as information packaging, coherence, clarity, conciseness, intertextual framing and sourcing. With a view to informing academic writing description and instruction, we examined the relationship between bracketed text and its cotext in a wide variety of disciplines and assignment genres. The relationships are described using an adaptation of Halliday and Matthiessen’s (2014) logico-semantic framework of clausal relationships. To better understand and teach the use of this information packaging feature, we studied the relationship between bracketed text and its cotext in the British Academic Written English (BAWE) corpus of high-graded student assignments. Using Sketch Engine and corpus query language, we extracted a random sample of 2000 instances of bracketing in running text only. This subcorpus is composed of 500 instances from each of the four main disciplinary groupings (Arts and Humanities, Life Sciences, Physical Sciences, Social Sciences) and contains instances from most of the BAWE assignment genres. The concordances were imported into a database table in FileMaker Pro. This database programme facilitates coding by limiting choices depending on previous selections and thus guiding the coder through the analytical steps. For the analysis of the data, it offers flexibility for grouping records and aggregating results on different levels. The logico-semantic framework used in systemic functional linguistics to classify the relationships between clauses (Halliday & Matthiessen, 2014) served as our starting point to classify the relationships between bracketed text and cotext. This framework distinguishes two fundamental logico-semantic relationships: expansion, which ‘relates phenomena as being of the same order of experience’, and projection, which ‘relates phenomena of one order of experience (the processes of saying and thinking) to phenomena of a higher order (semiotic phenomena – what people say and think)’ (p. 443). The latter contains three subtypes: elaboration (‘one clause elaborates on the meaning of another by further specifying or describing it’) (p. 461), enhancement (‘one clause (or subcomplex) enhances the meaning of another by qualifying it) (p. 476) and extension (‘one clause extends the meaning of another by adding something new to it’) (p. 471). This framework was refined and expanded through several stages of interrating and discussion in order to reflect our findings. We first analysed a random sample of 1000 instances from the whole BAWE corpus. With the resulting adapted classificatory framework we next independently analysed a quarter of our subcorpus of 2000 concordances. This led to further refinement of the framework and classificatory criteria. Finally, we each analyzed a different set of concordances from the disciplinary groupings. Disciplinary informants were consulted where needed. Our analysis revealed four major logico-semantic relationships between the bracketed text and cotext: in addition to Halliday & Matthiessen’s (2014) projection (1) and expansion (elaboration (2), enhancement (3, 4), extension (5)), we identified bracketed text functioning as intratextual reference (6) and code (7). The few instances that could not be confidently classified were assigned to a ‘hard to classify’ category. (1) However the anticipated number of children per woman in Europe and the USA is still near or above two (Bongaarts, 1999), showing that many are still having children. (2) Many of these injures are healed fractures and breaks occurring around the torso (upper body). (3) It is dated to the reign of Nectanebo II (360-343 BC). (4) Acetanilide (4.78g, 35.4 mmol) was dissolved in cold, glacial acetic acid (25ml, 437.1 mmol) (5) Parmenides decision to include a cosmology that he has already (apparently) proved to be flawed is an interesting one to say the least. (6) This is called circular polarization (figure 5) and is the natural state of white light. (7) Stronger field ligands such as (PPh 3) and (NCS) increase the splitting. Projection was –perhaps not surprisingly- the most common relationship by far, although markedly less frequent in the Physical Sciences. Expansion was mainly achieved through elaboration, with restatements (2) and abbreviations predominating. Enhancement relationships were mostly temporal locations (3) or measurements (4). Extension was relatively rare (5). Intratextual references (6) took various forms, such as figures, appendices, equations, and line numbers for quoted text. Bracketed code was a marked feature of the Physical Sciences, occurring in formulae and enclosing symbols or abbreviations (7). Overall, students’ use of bracketed text appeared to reflect disciplinary conventions and reflected the genre goals of assignments by demonstrating knowledge, understanding and appropriate source use. Contrary to expectations, instances where the bracketed text seemed superfluous or adversely affected coherence were rare. We conclude by discussing what these findings mean for academic writing instruction. Reference Halliday, M. A. K., & Matthiessen, C. M. I. M. (2014). Halliday's introduction to functional grammar (4 ed.). Abingdon: Routledge. [less ▲]

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See detailTies that bind: Unearthing shared treasures between Luxemoburg and Brazil
Santana, Dominique UL; Luciano, Alessandra

Scientific Conference (2019, July 18)

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See detailSoviet psychologist turned American educational entrepreneur: Lev Landa and “the repatriation” of the theory of programmed learning
Boretska, Viktoria UL

Scientific Conference (2019, July 18)

The theory of programmed instruction (PI), developed by a Harvard psychologist B. F. Skinner and heavily invested into in the spur of the Sputnik shock, became the toast of educational world during the ... [more ▼]

The theory of programmed instruction (PI), developed by a Harvard psychologist B. F. Skinner and heavily invested into in the spur of the Sputnik shock, became the toast of educational world during the decade of 1960s (Spaulding, 1967). Surprisingly for this peak decade of the Cold War, it also reached the Soviet Union: More than that, PI’s Soviet promoters did everything in order to secure place for research on programmed learning: PI was legitimated in front of thorough Communist Party ideologists who didn’t allow for any “Western import”, it was protected by the former military-turned-educational scientists, and established in the Institute of Cybernetics (Berg, 1961). During this time, PI was translated through and connected to a body of work and the network of psychological concepts that the discipline in the Soviet Union operated (Leontiev, 1959). Specifically, among others, educational psychologist and a devoted promoter of PI in the Soviet Union, Lev Landa, has developed the theory of algo-heuristic instruction and generically connected it to the theory of programmed learning (Landa, 1962). Soon in 1970s, Lev Landa expatriated to the United States and brought this Soviet version of programmed instruction back to its “homeland”. He established his company Landamatics in the heart of New York and started providing other companies’ middle management with educational services. His training constituted of a set of algorithms, units of information in a logically assembled and coherent way, very much like Skinner's conception of programmed learning decades ago. But this time, the algorithm became a certain externalized idealized structure of thought - that should be learnt and practised. Technically, Landa's enterprise represented the general and, to a large extent, shared belief of the time that is sometimes called the "Cold War rationality", the reinvention of the ideals of Enlightenment during the Cold War. The unique loop that programmed instruction travelled allows for a more profound understanding of the reinvention, the constant morphing of educational ideas in space and time. [less ▲]

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See detailHow is parental activity related to children's physical activity behavior?
Hutmacher, Djenna UL; Eckelt, Melanie UL; Bund, Andreas UL et al

Poster (2019, July 18)

Objectives: Social support from parents is considered a primary influence of youth’ physical activity (PA; Beets, Cardinal & Alderman, 2010). However, the mechanisms of parental influence are still poorly ... [more ▼]

Objectives: Social support from parents is considered a primary influence of youth’ physical activity (PA; Beets, Cardinal & Alderman, 2010). However, the mechanisms of parental influence are still poorly understood. As the theory of planned behavior (TPB; Ajzen, 1985) is a well-supported theoretical framework to study youth’ engaging in PA, this study wants to investigate if an increased PA of the parents is enhancing the PA of their children and is related to different constructs of the TPB. Method: 264 students (52,6% females) from 11 to 21 years participated in the study. Via a digital questionnaire the students indicated if they are active at least 60 minutes a day, if their mother and father is physically active on a regular basis and if they are active together with their parents. Regarding the TPB, attitudes, subjective norms, perceived behavioral control and intentions towards PA were assessed (Hagger, Chatzisarantis, Culverhouse & Biddle, 2003). Results: A multivariate ANOVA revealed that children reported higher PA rates, more intense attitudes and higher subjective norms towards PA when the father was physically active and when being active together with their parents. However, the perceived behavioral control was higher when children indicated that their mother was physically active. Discussion: As expected, results suggest that the reported PA of parents are related to the self-reported PA of children, and furthermore to the different constructs of the TPB. Especially fathers seem to be an important role model regarding PA, attitudes and subjective norms toward PA. [less ▲]

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See detailAnalysis of Multi-path Onion Routing-based Anonymization Networks
de La Cadena Ramos, Augusto Wladimir UL; Kaiser, Daniel UL; Mitseva, Asya UL et al

in Data and Applications Security and Privacy XXXIII, 2019 (2019, July 15)

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See detailMining Android Crash Fixes in the Absence of Issue- and Change-Tracking Systems
Kong, Pingfan UL; li, li; Gao, Jun et al

Scientific Conference (2019, July 15)

Android apps are prone to crash. This often arises from the misuse of Android framework APIs, making it harder to debug since official Android documentation does not discuss thoroughly potential ... [more ▼]

Android apps are prone to crash. This often arises from the misuse of Android framework APIs, making it harder to debug since official Android documentation does not discuss thoroughly potential exceptions.Recently, the program repair community has also started to investigate the possibility to fix crashes automatically. Current results, however, apply to limited example cases. In both scenarios of repair, the main issue is the need for more example data to drive the fix processes due to the high cost in time and effort needed to collect and identify fix examples. We propose in this work a scalable approach, CraftDroid, to mine crash fixes by leveraging a set of 28 thousand carefully reconstructed app lineages from app markets, without the need for the app source code or issue reports. We developed a replicative testing approach that locates fixes among app versions which output different runtime logs with the exact same test inputs. Overall, we have mined 104 relevant crash fixes, further abstracted 17 fine-grained fix templates that are demonstrated to be effective for patching crashed apks. Finally, we release ReCBench, a benchmark consisting of 200 crashed apks and the crash replication scripts, which the community can explore for evaluating generated crash-inducing bug patches. [less ▲]

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See detailWind music and scholarship. IGEB and WASBE
Sagrillo, Damien UL

Scientific Conference (2019, July 13)

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See detailRecent Activities on Tristan da Cunha Island: Geodetic Installations, Local Tie Measurements and their Analysis
Teferle, Felix Norman UL; Hunegnaw, Addisu UL; Backes, Dietmar UL et al

Scientific Conference (2019, July 11)

During 2017 a team from the University of Luxembourg and the National Oceanography Centre, Liverpool, established a permanent Global Navigation Satellite System (GNSS) station and two new tide gauges on ... [more ▼]

During 2017 a team from the University of Luxembourg and the National Oceanography Centre, Liverpool, established a permanent Global Navigation Satellite System (GNSS) station and two new tide gauges on Tristan da Cunha Island in the South Atlantic Ocean. These installations were funded through various projects at both collaborating institutions under the umbrella of the International GNSS Service (IGS) Tide Gauge Benchmark Monitoring (TIGA) Working Group and the Global Geodetic Observing System (GGOS) focus area on Sea Level Change, Variability and Forecasting. While this was the first scientific installation of a GNSS station on the main island within the Tristan da Cunha archipelago, IGS station GOUG, located on Gough Island which lies 412 km to the south, has been in operation since 1998. Unfortunately GOUG was decommissioned in 2018. Sea level observations on Tristan da Cunha have a longer history than GNSS with various tide gauges having been in operation since 1984. Tristan da Cunha also hosts a Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) station which was established in 2012 after a previous installation was upgraded and moved to the current site. The antenna TCTA is located on the concrete monument of the previous DORIS antenna. Furthermore, in order for future International Terrestrial Reference Frame (ITRF) computations to fully benefit from the proximity of the sensors, the geodetic ties between the respective antennas (and reference markers in case of the tide gauges) need to be determined at the millimeter level using various terrestrial surveying methods and a local benchmark network. This contribution provides details of the activities on Tristan da Cunha including the installations, the established benchmark network, the terrestrial surveys of the geodetic ties and the analysis of these measurements in order to geometrically link the GNSS and DORIS antennas to each other as well as to the tide gauges. [less ▲]

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See detailFacial perception and implicit prejudice: An eye-tracking study
Stogianni, Maria UL; Murdock, Elke UL

Poster (2019, July 09)

Racial bias can affect the way of processing visual stimuli that are targets of prejudice. Different levels of prejudice and the type of prejudice (implicit vs. explicit) were related to automatic and ... [more ▼]

Racial bias can affect the way of processing visual stimuli that are targets of prejudice. Different levels of prejudice and the type of prejudice (implicit vs. explicit) were related to automatic and controlled processes of visual exploration (Hansen Rakhshan, Ho, & Pannasch, 2015). The proposed study aims to extend these findings by including pictures of individuals that belong to different racial and ethnic groups (White, Asian, Black, Latino) and vary in prototypical characteristics. Images of the Chicago Face Database will be presented in an online study. Eye movements will be recorded during the presentation of visual stimuli. We will examine differences in exploratory looking behavior among natives in a western European country and individuals with migratory background. [less ▲]

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See detailWHY IS THE MARKET SKEWNESS-RETURN RELATIONSHIP NEGATIVE?
Lehnert, Thorsten UL

Scientific Conference (2019, July 09)

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See detailNamenskunde – Gender(re)konstruktionen in Autobiographien von Transpersonen
Artuso, Sandy Kathy UL

Scientific Conference (2019, July 05)

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See detailInformation Content of Systematic and Idiosyncratic Risk Disclosure
Weber, Véronique UL; Muessig, Anke UL

Scientific Conference (2019, July 04)

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See detailCharacterisation of demountable shear connector systems in composite beams
Kozma, Andras UL; Odenbreit, Christoph UL; Braun, Matthias Volker UL

Scientific Conference (2019, July 04)

Reusable structures can contribute to a resource-efficient low-carbon future on the basis of the principles of the circular economy. This paper presents a comparison of different demountable shear ... [more ▼]

Reusable structures can contribute to a resource-efficient low-carbon future on the basis of the principles of the circular economy. This paper presents a comparison of different demountable shear connector systems that facilitate recyclability and reusability of steel-concrete composite structures with the performance of traditional ones. In the Laboratory of the ArcelorMittal Chair of Steel and Façade Engineering at the University of Luxembourg 15 push-out tests and 2 full-scale beam tests have been carried out using different bolted shear connection systems suitable for reuse after the end of life of the respective building. The analysed shear connector systems have been evaluated based on their resistance, slip capacity, stiffness, ductility and ease of fabrication, assembly and disassembly. The experimental work was supplemented by numerical simulations performed with the finite element software Abaqus®. The developed numerical models were validated against the experimental observations. The experimental and numerical results provide information for future design guidance concerning the use of demountable shear connectors in composite beams. [less ▲]

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See detailStatement of the Board on Cultural and Ethnic Diversity towards intercultural and individual Diversity
De Ponte, Ulrike; Albert, Isabelle UL; Žegura, Iva

Scientific Conference (2019, July 03)

Cultural and individual diversity is getting more and more part of the daily work of each psychologist nowadays, but still this issue is less or insufficiently addressed in the study programmes all over ... [more ▼]

Cultural and individual diversity is getting more and more part of the daily work of each psychologist nowadays, but still this issue is less or insufficiently addressed in the study programmes all over Europe. Therefore, psychologists work repeating in situations of the quality of a cultural overlap being not or insufficient prepared for this yet. The psychologists’ core work of understanding and supporting people from a psychological point of view lacks knowledge as well as the performance of taking in account multiple and differentiated perspectives. The conclusion is: The subject Intercultural psychology needs to be mandatorily included into the curricula of study programmes of Psychology and this already on Bachelor levels. This joint-symposium is supposed to aim in working groups after the input-presentations in order to collect all kind of psychologists’ views on the needs that are seen out of the view of the divers working fields of psychologists. [less ▲]

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See detailElder Care in the Context of Migration
Albert, Isabelle UL; Kretschmer, Mirjam; Malerba, Angela et al

Scientific Conference (2019, July 03)

Background: Demographic changes related to ageing and migration are key societal issues of our days. Cultural diversity in elder care will increase considerably in the next years especially in Northern ... [more ▼]

Background: Demographic changes related to ageing and migration are key societal issues of our days. Cultural diversity in elder care will increase considerably in the next years especially in Northern and Western European countries due to a large share of first generation immigrants from the 1950s to 1970s. Culture-specific needs, expectations and behavioral tendencies become particularly salient in times of frailty. Cultures differ in how they arrange old age care and intergenerational co-residence patterns. When families migrate from a more collectivist, family-oriented to a more individualist cultural context, the question arises in how far traditional care patterns from the country of origin are retained or adapted to the host cultural context. Ageing migrants have been found to be more reluctant regarding formal care due to cultural, religious or language issues which might put specific pressure on their close family members who are often responsible for care arrangements, even if not providing hands-on care. Objectives: The aim of the present study was to examine how established formal assistance should be modified in order to fit the special needs of both informal caregivers and care receivers with migration background. For this purpose, we will draw on two sub-studies: a) a qualitative study with n = 3 in-depth expert-interviews in the field of elder care and migration, and b) a survey in a daycare center with a large population of elder care receivers with migrant background. Results/Discussion: Preliminary results show different starting points for a culture-sensitive adaptation of the services. First, as the existence of help services is often unknown to migrants, it is important to provide low-threshold information, involving multipliers. Second, an important aspect is the culture-sensitive training of staff, increasing their awareness of cultural aspects in care and introducing an individualized as well as relationship-oriented approach. Finally, the exchange of caregivers with other concerned turned out to be a helpful resource and therefore it shall be facilitated and supported by formal services. A structural integration of cultural sensitive care services in the existing elder care system is highly suggested in order to meet the future challenges. [less ▲]

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See detailTranslanguaging as a pedagogy, a practice or a strategy? Examples from a preschool and a primary school class in Luxembourg
Kirsch, Claudine UL; Degano, Sarah UL; Mortini, Simone UL

Scientific Conference (2019, July 01)

The concept of translanguaging has been continuously redefined in education, psycholinguistics and sociolinguistics, which has led to some loss of meaning. Regarding teacher translanguaging, studies show ... [more ▼]

The concept of translanguaging has been continuously redefined in education, psycholinguistics and sociolinguistics, which has led to some loss of meaning. Regarding teacher translanguaging, studies show that it has been used as a strategy to further comprehension and learning, and as a pedagogy. The latter recognizes the existence of multiple languages in class and leverages the students’ semiotic system to make meaning and learn (García et al. 2017). Translanguaging has thereby been understood either as a resource-oriented pedagogy that challenges traditional conceptualizations of bilingualism and language learning, or as a pedagogy that fights social inequalities. Most research studies adopt the first view (Poza, 2017). The present paper combines two longitudinal doctoral studies and investigates the ways in which a preschool and a primary school teacher use translanguaging in their classes in Luxembourg. Drawing on interviews and observations, the findings show that the preschool teacher implemented a translanguaging pedagogy. She planned for the use of several languages, opened translanguaging spaces, and systematically translanguaged where she believed it would support learning (Kirsch et al. submitted). By contrast, the primary school teacher used translanguaging as a pedagogical strategy. She used the curricular languages and only translanguaged to support particular students. These differences are explained by the curriculum and the preschool teacher’s attendance of a professional development course. The findings contribute to our understanding of possible ways of implementing translanguaging as a pedagogy. [less ▲]

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See detailTranslanguaging Course for Teachers
Aleksic, Gabrijela UL; Bebic-Crestany, Dzoen

Scientific Conference (2019, July 01)

Amongst the many terms to describe the natural linguistic experiences of bilinguals, translanguaging is standing out as the socio-linguistic theory that consciously recognises a unitary linguistic ... [more ▼]

Amongst the many terms to describe the natural linguistic experiences of bilinguals, translanguaging is standing out as the socio-linguistic theory that consciously recognises a unitary linguistic repertoire of bilinguals. Translanguaging is used without regards to boundaries imposed by socio-politically constructed named languages and the unnatural differentiation of various forms of communication. The extensive research of many scholars, most notably by Li Wei and Ofelia García, confronts the social and educational suppression of minorities’ languages and cultures in schools. Their analyses and proposed solutions for social justice, therefore, serve as the theoretical and pedagogical basis of our research in Luxembourg’s multilingual education. The understanding that bilinguals translanguage naturally in conversation and for sense- and meaning-making purposes has also been shown in Luxembourg: 64% of four-year olds in Luxembourg do not speak Luxembourgish and translanguaging happens naturally. Research also shows that students of minority groups generally underperform at school. The implementation of translanguaging in Luxembourg’s multilingual education would therefore enable a better development of school and home language, metalinguistic awareness, linguistic tolerance, socio-emotional development and multilingual identity. To address the challenges of multilingual education in Luxembourg, we firstly offer a professional development (PD) course that aims to help teachers take a translanguaging stance, vital for its success. Secondly, we adapt the general translanguaging pedagogical methodology to incorporate home languages in teachers’ daily classroom activities. Our project has been supported by the Luxembourg National Research Fund* to deliver 8 sessions from the Translanguaging guide developed at the City University of New York. Given the local multilingual context, introducing translanguaging and adapting the guide is a challenge for us as researchers. We will use quantitative and qualitative methods to assess the success of the PD and better understand translanguaging as a theory, practice and pedagogy. [less ▲]

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See detailA Model-driven Approach to Trace Checking of Temporal Properties with Aggregations
Boufaied, Chaima UL; Bianculli, Domenico UL; Briand, Lionel UL

in Journal of Object Technology (2019, July), 18(2), 151-21

The verification of complex software systems often requires to check quantitative properties that rely on aggregation operators (e.g., the average response time of a service). One way to ease the ... [more ▼]

The verification of complex software systems often requires to check quantitative properties that rely on aggregation operators (e.g., the average response time of a service). One way to ease the specification of these properties is to use property specification patterns, such as the ones for “service provisioning”, previously proposed in the literature. In this paper we focus on the problem of performing offline trace checking of temporal properties containing aggregation operators. We first present TemPsy-AG, an extension of TemPsy—an existing pattern-based language for the specification of temporal properties—to support service provisioning patterns that use aggregation operators. We then extend an existing model-driven procedure for trace checking, to verify properties expressed in TemPsy-AG. The trace checking procedure relies on the efficient mapping of temporal properties written in TemPsy-AG into OCL constraints on a meta-model of execution traces. We have implemented this procedure in the TemPsy-Check-AG tool and evaluated its performance: our approach scales linearly with respect to the length of the input trace and can deal with much larger traces than a state-of-the-art tool. [less ▲]

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See detailCrowdsensed Data Learning-Driven Prediction of Local Businesses Attractiveness in Smart Cities
Capponi, Andrea UL; Vitello, Piergiorgio UL; Fiandrino, Claudio UL et al

in IEEE Symposium on Computers and Communications (ISCC), Barcelona, Spain, 2019 (2019, July)

Urban planning typically relies on experience-based solutions and traditional methodologies to face urbanization issues and investigate the complex dynamics of cities. Recently, novel data-driven ... [more ▼]

Urban planning typically relies on experience-based solutions and traditional methodologies to face urbanization issues and investigate the complex dynamics of cities. Recently, novel data-driven approaches in urban computing have emerged for researchers and companies. They aim to address historical urbanization issues by exploiting sensing data gathered by mobile devices under the so-called mobile crowdsensing (MCS) paradigm. This work shows how to exploit sensing data to improve traditionally experience-based approaches for urban decisions. In particular, we apply widely known Machine Learning (ML) techniques to achieve highly accurate results in predicting categories of local businesses (LBs) (e.g., bars, restaurants), and their attractiveness in terms of classes of temporal demands (e.g., nightlife, business hours). The performance evaluation is conducted in Luxembourg city and the city of Munich with publicly available crowdsensed datasets. The results highlight that our approach does not only achieve high accuracy, but it also unveils important hidden features of the interaction of citizens and LBs. [less ▲]

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See detailThe use of value-added models for the identification of schools that perform “against the odds”
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Poster (2019, July)

Value-added (VA) modeling aims to quantify the effect of pedagogical actions on students’ achievement, independent of students’ backgrounds. VA modeling is primarily used for accountability and high ... [more ▼]

Value-added (VA) modeling aims to quantify the effect of pedagogical actions on students’ achievement, independent of students’ backgrounds. VA modeling is primarily used for accountability and high-stakes decisions. To date, there seems to be no consensus concerning the calculation of VA models. Our study aims to systematically analyze and compare different school VA models by using longitudinal large-scale data emerging from the Luxembourg School Monitoring Programme. Regarding the model covariates, first findings indicate the importance of language (i.e., language(s) spoken at home and prior language achievement) in VA models with either language or math achievement as a dependent variable, with the highest amount of explained variance in VA models for language. Concerning the congruence of different VA approaches, we found high correlations between school VA scores from the different models, but also high ranges between VA scores for single schools. We conclude that VA models should be used with caution and with awareness of the differences that may arise from methodological choices. Finally, we discuss the idea that VA models could be used for the identification of schools that perform “against the odds”, especially for those schools that have positive VA scores over several years. [less ▲]

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See detailYes, we can! Mining Arguments in 50 Years of US Presidential Campaign Debates
Haddadan, Shohreh UL; Villata, Serena; Cabrio, Elena

Scientific Conference (2019, July)

Political debates offer a rare opportunity for citizens to compare the candidates’ positions on the most controversial topics of the campaign. Thus they represent a natural application scenario for ... [more ▼]

Political debates offer a rare opportunity for citizens to compare the candidates’ positions on the most controversial topics of the campaign. Thus they represent a natural application scenario for Argument Mining. As existing research lacks solid empirical investigation of the typology of argument components in political debates, we fill this gap by proposing an Argument Mining approach to political debates. We address this task in an empirical manner by annotating 39 political debates from the last 50 years of US presidential campaigns, creating a new corpus of 29k argument components, labeled as premises and claims. We then propose two tasks: (1) identifying the argumentative components in such debates, and (2) classifying them as premises and claims. We show that feature-rich SVM learners and Neural Network architectures outperform standard baselines in Argument Mining over such complex data. We release the new corpus USElecDeb60To16 and the accompanying software under free licenses to the research community. [less ▲]

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See detailTogether or Alone: The Price of Privacy in Collaborative Learinig
Pejo, Balazs UL; Tang, Qiang; Biczók, Gergely

in Proceedings on Privacy Enhancing Technologies (2019, July)

Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training ... [more ▼]

Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training dataset; in reality a small or medium sized organization often does not have the necessary data to train a reasonably accurate model. For such organizations, a realistic solution is to train their machine learning models based on their joint dataset (which is a union of the individual ones). Unfortunately, privacy concerns prevent them from straightforwardly doing so. While a number of privacy-preserving solutions exist for collaborating organizations to securely aggregate the parameters in the process of training the models, we are not aware of any work that provides a rational framework for the participants to precisely balance the privacy loss and accuracy gain in their collaboration. In this paper, by focusing on a two-player setting, we model the collaborative training process as a two-player game where each player aims to achieve higher accuracy while preserving the privacy of its own dataset. We introduce the notion of Price of Privacy, a novel approach for measuring the impact of privacy protection on the accuracy in the proposed framework. Furthermore, we develop a game-theoretical model for different player types, and then either find or prove the existence of a Nash Equilibrium with regard to the strength of privacy protection for each player. Using recommendation systems as our main use case, we demonstrate how two players can make practical use of the proposed theoretical framework, including setting up the parameters and approximating the non-trivial Nash Equilibrium. [less ▲]

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See detailSurface characterization of epitaxial Cu-rich CuInSe2 absorbers
Martin Lanzoni, Evandro UL; Spindler, Conrad UL; Ramirez Sanchez, Omar UL et al

in IEEE Photovoltaic Specialists Conference. Conference Record (2019, July)

We investigated the electrical properties of epitaxial Cu-rich CuInSe 2 by Kelvin probe force microscopy (KPFM) under ambient and ultra-high vacuum conditions. We first measured the sample under ambient ... [more ▼]

We investigated the electrical properties of epitaxial Cu-rich CuInSe 2 by Kelvin probe force microscopy (KPFM) under ambient and ultra-high vacuum conditions. We first measured the sample under ambient conditions before and after potassium cyanide (KCN) etching. In both cases, we do not see any substantial contrast in the surface potential data; furthermore, after the KCN etching we observed outgrowths with a height around 2nm over the sample surface. On the other hand, the KPFM measurements under ultra-high vacuum conditions show a work function dependence according to the surface orientation of the Cu-rich CuInSe 2 crystal. Our results show the possibility to increase the efficiency of epitaxial Cu-rich CuInSe 2 by growing the materials in the appropriated surface orientation where the variations in work function are reduced. [less ▲]

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See detailTBar: Revisiting Template-based Automated Program Repair
Liu, Kui UL; Koyuncu, Anil UL; Kim, Dongsun et al

in 28th ACM SIGSOFT International Symposium on Software Testing and Analysis (ISSTA) (2019, July)

We revisit the performance of template-based APR to build com-prehensive knowledge about the effectiveness of fix patterns, andto highlight the importance of complementary steps such as faultlocalization ... [more ▼]

We revisit the performance of template-based APR to build com-prehensive knowledge about the effectiveness of fix patterns, andto highlight the importance of complementary steps such as faultlocalization or donor code retrieval. To that end, we first investi-gate the literature to collect, summarize and label recurrently-usedfix patterns. Based on the investigation, we buildTBar, a straight-forward APR tool that systematically attempts to apply these fixpatterns to program bugs. We thoroughly evaluateTBaron the De-fects4J benchmark. In particular, we assess the actual qualitative andquantitative diversity of fix patterns, as well as their effectivenessin yielding plausible or correct patches. Eventually, we find that,assuming a perfect fault localization,TBarcorrectly/plausibly fixes74/101 bugs. Replicating a standard and practical pipeline of APRassessment, we demonstrate thatTBarcorrectly fixes 43 bugs fromDefects4J, an unprecedented performance in the literature (includ-ing all approaches, i.e., template-based, stochastic mutation-basedor synthesis-based APR). [less ▲]

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See detailLearning-Based Resource Allocation: Efficient Content Delivery Enabled by Convolutional Neural Network
Lei, Lei UL; Yaxiong, Yuan UL; Vu, Thang Xuan UL et al

in IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) 2019 (2019, July)

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See detailJoint Power Allocation and Distributed Beamforming Design for Multi-Carrier Asynchronous Two-Way Relay Networks
KianiHarchehgani, Sharareh; Shahbazpanahi, Shahram UL; Dong, Min et al

in IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) 2019, Cannes, July 2019 (2019, July)

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See detailA Critical Security Analysis of the Password-Based Authentication Honeywords System Under Code-Corruption Attack
Genç, Ziya Alper UL; Lenzini, Gabriele UL; Ryan, Peter UL et al

in Information Systems Security and Privacy (2019, July)

Password-based authentication is a widespread method to access into systems, thus password files are a valuable resource often target of attacks. To detect when a password file has been stolen, Juels and ... [more ▼]

Password-based authentication is a widespread method to access into systems, thus password files are a valuable resource often target of attacks. To detect when a password file has been stolen, Juels and Rivest introduced the Honeywords System in 2013. The core idea is to store the password with a list of decoy words that are ``indistinguishable'' from the password, called honeywords. An adversary that obtains the password file and, by dictionary attack, retrieves the honeywords can only guess the password when attempting to log in: but any incorrect guess will set off an alarm, warning that file has been compromised. In a recent conference paper, we studied the security of the Honeywords System in a scenario where the intruder also manages to corrupt the server's code (with certain limiting assumptions); we proposed an authentication protocol and proved it secure despite the corruption. In this extended journal version, we detail the analysis and we extend it, under the same attacker model, to the other two protocols of the original Honeywords System, the setup and change of password. We formally verify the security of both of them; further, we discuss that our design suggests a completely new approach that diverges from the original idea of the Honeywords System but indicates an alternative way to authenticate users which is robust to server's code-corruption. [less ▲]

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See detailEquations to predict the shear connection capacity of composite beams with slender profiled steel sheeting
Odenbreit, Christoph UL; Vigneri, Valentino UL; Lam, Dennis

Scientific Conference (2019, July)

The rules of EN1994-1-1 for shear connections in composite beams with deep profiled sheeting sometimes lead to an overestimation of the load bearing capacity of the respective shear connection. The ... [more ▼]

The rules of EN1994-1-1 for shear connections in composite beams with deep profiled sheeting sometimes lead to an overestimation of the load bearing capacity of the respective shear connection. The estimation of the impact of the sheeting shape on the calculated connection resistance is based on test results from the late seventies until the early nineties. Meanwhile, new products have appeared on the market with the target to reduce the volume and weight of the concrete in order to maximize the slab efficiency. However, the corresponding effects onto the shear connection have been underestimated because the use of deeper and more narrow deck rib lead to a more slender profile with a changed failure behaviour. Instead of the shearing-off failure of the stud, a combination of concrete cone failure and plastic bending of the stud – with one or two plastic hinges - was identified in laboratory tests. Based on the observed failure mechanisms, a new mechanical model with respective analytical equations for the shear resistance of headed studs in profiled steel sheeting was proposed. The new model extends the yield hinge mechanism, which was developed by Lungershausen [1], to more precisely predict the formation of the number of yield hinges depending on the mechanical and geometrical properties with the support of a finite element model. The complete equations consider the geometry of the stud and the steel decking as well as the material strengths of the stud and concrete. The statistical evaluation shows a good accordance with the developed model and analytical design equations. This contribution presents the new design equations and their background describing the mechanical model, the numerical study and statistical evaluation of push-out test results. [less ▲]

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See detailAmbitious Amateurs – The Greater Region's Amateur Film Clubs in the long 1960s
Wack, Julia UL

Scientific Conference (2019, July)

Ambitious Amateurs aims to investigate the mass taste of its time through the lens of the participatory cultural practice of filming. The film makers were consumers of a medium they were co-creating ... [more ▼]

Ambitious Amateurs aims to investigate the mass taste of its time through the lens of the participatory cultural practice of filming. The film makers were consumers of a medium they were co-creating themselves, largely producing for a circle of peers. The aesthetic form of these films and genres, the excess of meaning, as well as the moral political ideals represent central axes of the analysis. Additionally, relations between the club members and their activities in national umbrella associations, collaborations, as well as contexts of transnational encounters (i.e. UNICA, the international association of amateur film clubs) shall be further observed. This is being executed on the examples of selected clubs in bordering locations in the ‘Greater Region’: Luxembourg, Wallonia (Belgium), Lorraine (France) and Saarland (Germany) - an artificial construct of an economic trade union within the European Union on the one hand, with a shared cultural heritage shaped by the coal and steel industries and their demise on the other. Besides archive research and Oral History, the film documents themselves are the core piece of the analysis. The topic is of particular relevance for general Culture and Media History, due to the historical evolution of censorship and auto-censorship tendencies regarding sexual permissiveness, political militancy or religious statements in the long 1960s. On the particular European transnational level, the material is investigated considering the issue of Americanisation, respectively the rejection of the latter within the discourse of European film creators and the topical press. The international comparison additionally facilitates the display of national specificities and diverse temporalities within (Western)Europe. It currently appears that the demographics of the clubs were transnationally rather homogenous. The comparison of topics, genres, visual and technical styles the authors were interested in and the notable exceptions within the scope, are thus mirroring the zeitgeist of the research period. [less ▲]

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See detailPLASTIC DESIGN FOR COMPOSITE BEAMS - ARE THERE ANY LIMITS?
Schäfer, Markus UL; Zhang, Qingjie UL; Braun et al

in Proceedings of the 9th International Conference on Steel and Aluminium Structures ICSAS19 (2019, July)

Due to the demand for sustainable constructions, composite structures have become more important and lead to slim and economic solutions with a low structural self-weight. EN 1994-1-1 differentiate four ... [more ▼]

Due to the demand for sustainable constructions, composite structures have become more important and lead to slim and economic solutions with a low structural self-weight. EN 1994-1-1 differentiate four different cross-section classes for the determination of moment resistance. For the plastic design of the moment resistance it is assumed, that each cross-sectional fibre can plastify without any limitation of the strains. For standard composite beams in case of sagging moments and a high-lying plastic neutral axis, plastic design and strain-limited design give similar results. In the case of sections with a large compression zone height xpl and limited rotation capacity, a concrete failure in the compression zone can occur before the plastic moment resistance Mpl,Rd, is reached. The strain limit design becomes decisive. This paper points out the impact of the concrete part on the design of composite beams. A parametric study comparing plastic and strain limited moment resistance of a considerable variety of cross-sections has been carried out to develop the beam design methods considering high compression zone height of next generation of Eurocodes. [less ▲]

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See detailA DEM approach for modeling biomass fast pyrolysis in a double auger reactor
Qi, Fenglei UL

Scientific Conference (2019, July)

Thermochemical conversion of biomass via fast pyrolysis process is a promising way to produce renewable fuels and chemicals. In this paper, an extended discrete element method (DEM) is developed to ... [more ▼]

Thermochemical conversion of biomass via fast pyrolysis process is a promising way to produce renewable fuels and chemicals. In this paper, an extended discrete element method (DEM) is developed to predict the biomass fast pyrolysis process in a double auger reactor, which is described as a reacting granular flow. The thermodynamic state of each particle is properly predicted with an addition of a heat transfer model and a reaction model on top of the traditional DEM method. The results suggest that the predictions of the thermochemical decomposition kinetics of biomass components are consistent with the experimental observations. The results also indicate that the fast pyrolysis in the reactor is controlled by the heat transfer process. Any operating condition variation in favor of enhancing heat transfer is beneficial to the fast pyrolysis process and vice versa. [less ▲]

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See detailTechnological risks and political challenges: the emergence of Luxembourg’s satellite policy
Danescu, Elena UL

Scientific Conference (2019, June 29)

In the early 1970s, in a bid to diversify its economy – at that time primarily based on a declining steel industry and a still nascent international financial centre –, the Luxembourg government decided ... [more ▼]

In the early 1970s, in a bid to diversify its economy – at that time primarily based on a declining steel industry and a still nascent international financial centre –, the Luxembourg government decided to invest in the country’s audiovisual sector and to pursue a policy to develop telecommunications satellites that would be used to broadcast European television programmes. This ambitious yet risky objective represented a major challenge in five specific areas: in technological terms (choosing to invest in medium-range rather than the more dominant long-range satellites), in political terms (opting for US hardware and technology at the expense of the European leaders in the field, France and Germany), and with regard to culture (favouring the broadcast of programmes in English over those in French and German), management (the satellites were run via a private company with the government as the only shareholder), and standardisation, regulation and competition (especially at pan-European level). The Société Européenne des Satellites (SES) was finally set up in 1985, and Luxembourg’s first satellite for television broadcasts (GDL/ASTRA) was launched in 1987. Drawing on new sources, this paper looks back at the emergence of the GDL/ASTRA project from a historical perspective, highlighting the main political, financial, technological and regulatory hurdles that had to be overcome, the influence of the project on Luxembourg’s relationship with the USA and with EEC Member States (especially France and Germany but also the UK, which at that time was embarking on the accession process) and its role in the completion of a common market for new media technologies and ultimately in the development of a European audiovisual area. The impact of the policy as a driver for the financial centre (especially the Luxembourg Stock Exchange) and for various niche markets will also be emphasised. [less ▲]

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See detailForced migrants in Luxembourg: an LE approach to linguistic integration
Kalocsanyiova, Erika UL

Scientific Conference (2019, June 28)

This paper outlines the core contributions that a linguistic ethnography (LE) approach can make to forced migration and integration research. LE provides multiple tools for capturing the complexity and ... [more ▼]

This paper outlines the core contributions that a linguistic ethnography (LE) approach can make to forced migration and integration research. LE provides multiple tools for capturing the complexity and transient character of the real social environments in which forced migrants integrate. After summarising the main arguments of the literature which examines the language–displacement nexus, this contribution moves on to discuss the nature and focus of the proposed approach. It then turns to specific examples from a two-year LE research project that addressed the impact of multilingualism on forced migrants’ trajectories in Luxembourg. [less ▲]

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See detailExpansion nach Belgien als Verwaltungstätigkeit: der Kölner Beamte Franz Thedieck im NS
Brüll, Christoph UL

Scientific Conference (2019, June 28)

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See detail“I’m much better off…” - Comparative Processes and Future Intentions of Elder Portuguese Immigrants in Luxembourg
Albert, Isabelle UL

Scientific Conference (2019, June 28)

Ageing and migration have become key issues in many European countries as a large number of first generation immigrants are approaching retirement age in the next years. Focusing on elder Portuguese ... [more ▼]

Ageing and migration have become key issues in many European countries as a large number of first generation immigrants are approaching retirement age in the next years. Focusing on elder Portuguese immigrants in the Grand Duchy of Luxembourg, the present study had the aim to explore the roles of social and temporal comparisons for future intentions to stay in the receiving country, return to the country of origin or commute between both. Whereas earlier studies have examined the roles of social or cultural links, economic or health aspects, we focused here on the participants’ personal evaluation of their migratory project by asking them to evaluate their current situation compared with the past and with peers. A sample of N = 109 Portuguese first generation immigrants (49.5% female; average age: M = 55.35, SD = 7.42) who had been living in Luxembourg for about M = 30.69 (SD = 8.55) years were interviewed by use of a standardized questionnaire. Analyses showed that about half of participants preferred to stay in Luxembourg, whereas the remainder planned to return to Portugal or to commute. The appraisal of the current (vs. past) situation was significantly more positive for those who planned to stay or commute compared to those who wanted to return after retirement. Interestingly, both those who planned to return and those who wanted to stay engaged more frequently in social or temporal comparisons than those who preferred to commute. Results will be discussed taking into consideration regulatory processes of subjective well-being and different migration experiences. [less ▲]

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See detailLandscape typology of urban forest ecosystem services across European urban areas
Boura, Marlène Delphine Fabienne UL; Caruso, Geoffrey UL

Scientific Conference (2019, June 28)

Urban areas exhibit a large variety of patterns which may affect the negative externalities of human settlements on ecosystems. Ecosystem Services (ES) can help assessing the urban pressure on the ... [more ▼]

Urban areas exhibit a large variety of patterns which may affect the negative externalities of human settlements on ecosystems. Ecosystem Services (ES) can help assessing the urban pressure on the environment and its impact on the well-being of inhabitants. Compactness or densities have often been associated to potential ES. Yet, the effects of the relative spatial arrangement of vegetation, forests and water bodies, with respect to the urban lands - which are source of anthropogenic CO2 emissions - on potential ES are still not systematically analysed. In this work we propose a typology, for about 800 European urban areas (>50,000 inhabitants) based on the intra-urban structure of cities and the associated ES potentials. The GMES/Copernicus Urban Atlas 2012 database provides a comparable definition of urban area and land use categories, necessary to a systematic cross-European analysis. More particularly, we investigate the share of different land uses and the distance between human settlements, forests and the other vegetated lands as well as their relative spatial distribution within urban settlements. We then use spatial metrics as proxies for urban ES associated with urban forests – e.g., micro climate regulation (air cooling, shade), air pollution removal (canopy), rainwater runoff (impervious lands). The typology is created using an unsupervised machine learning approach (clustering) with standardized spatial metrics as input data. Different urban “forest cultures” across the continent are observable. Urban areas around the Mediterranean sea - facing warmer temperatures - attribute significantly more space to herbaceous lands (10 to 70%), but generally less than 10% for forests. Transport networks and infrastructures are more present along the axe going from central UK, to Italy and on the east coast of Spain (5 to 9%). Similarly, Industrial built up lands are more present along this axe, including west Germany, Romania and the east coast of Spain (5 to 22%). [less ▲]

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See detailOn the single-peakedness property
Devillet, Jimmy UL

Scientific Conference (2019, June 28)

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See detailN point Virasoro algebras are multi-point Krichever Novikov type algebras
Schlichenmaier, Martin UL

Scientific Conference (2019, June 28)

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See detailA small country in a global context: the case of Luxembourg’s cultural policy
Spirinelli, Fabio UL

Scientific Conference (2019, June 27)

This paper focuses on a small nation state instead of a big country to provide a different perspective on cultural policy history. Due to its small size, the Grand Duchy of Luxembourg has been influenced ... [more ▼]

This paper focuses on a small nation state instead of a big country to provide a different perspective on cultural policy history. Due to its small size, the Grand Duchy of Luxembourg has been influenced by the cultures of its neighbouring countries and looked beyond its national boundaries for inspirations. Members of the political, cultural and economic elite studied abroad and brought ideas and transnational contacts to Luxembourg. Hence, Luxembourg’s national cultural policy needs to be examined within the international context. Throughout the cultural policy of the 20th century, we discover numerous examples of how European and international developments have affected Luxembourg’s cultural policy. During the interwar period, a national era initiated by the First World War, the increasingly interventionist state promoted a national culture alongside a high culture imported from France and Germany. Intellectuals developed the idea that Luxembourgish culture was created by the mixture of French and German cultures. For its cultural policy, the government took inspiration from examples abroad: Luxembourg’s first law on the protection of national monuments and sites (1927) was influenced by a French law of 1913. In the 1970s, the development of a new cultural policy around concepts such as democratization of culture cannot be understood without the developments in other countries. From the 1980s onwards, European and global developments have increasingly influenced Luxembourg’s cultural policy. The promotion of the creative industries, for instance, is the most recent example of how Luxembourg follows a global trend. This paper has several aims. First, it wishes to analyse how Luxembourg has adapted models and reacted to developments abroad. Second, it wants to investigate to what extent Luxembourg has shifted its geographic horizon when looking for models and ideas. Third, it advocates for a cultural policy history that does not limit itself to national borders. [less ▲]

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See detailOpening Remarks / Chair / Program Chair
Schafer, Valerie UL

Scientific Conference (2019, June 27)

Decoding Europe. Technological Pasts in the Digital Age. The conference will study – in an interdisciplinary way – the impact of digitisation on historical developments and the consequences of the digital ... [more ▼]

Decoding Europe. Technological Pasts in the Digital Age. The conference will study – in an interdisciplinary way – the impact of digitisation on historical developments and the consequences of the digital turn on the writing and shaping of European history. The Tensions of Europe (ToE) conference is organised biennially. ToE is an interdisciplinary community of scholars who study the shaping of Europe by paying attention to the role of technology and material culture. It welcomes fruitful interaction between historians of technology and scholars who study technology from all other fields of the humanities and the social sciences. [less ▲]

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See detailChanges in Demography and Resulting Changes in Citizenship Law: The Case Study of Luxembourg
Wronska, Iwona; Murdock, Elke UL

Scientific Conference (2019, June 27)

The vast majority of democratic theory assumes the need for widespread political participation. The right to vote constitutes the most essential political right but in the era of migration the idea of ... [more ▼]

The vast majority of democratic theory assumes the need for widespread political participation. The right to vote constitutes the most essential political right but in the era of migration the idea of universal suffrage is far from being realized. The Grand Duchy of Luxembourg within its current borders is the result of 19th century diplomacy. In the space of less than 150 years the population of this state more than doubled - largely attributable to immigration. Today, 48% of the population are foreigners. The history of the creation of the Grand Duchy and the Law on Luxembourg Nationality are closely intertwined – the latter having undergone several changes – reflecting historic circumstances. The evolution of the Law on Luxembourgish Nationality and the discussions around “what constitutes a Luxembourger” illustrate the changes in perception of “Luxembourg nationality”. The underlying fundamental question is whether naturalization is the mid – or endpoint of successful integration into the host society. In this paper we will outline the different phases of the Luxembourg Law on Nationality, starting with the period of the French civil Code and ending with the current amendments of the naturalization law. This paper reflects the relation between migration and changes in the naturalization law in Luxembourg. The authors show how successive Luxembourgish governments have accommodated citizenship rights of foreign nationals, but are constrained by political groups defending national preferences. Overall, Luxembourg can be described as an immigration success story, facing the future challenge of accommodating all groups living in Luxembourg. [less ▲]

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See detailLaser polishing of Aluminum and Polyamide for dissimilar laser welded assemblies
Amne Elahi, Mahdi UL; Koch, Marcus; Plapper, Peter UL

Scientific Conference (2019, June 27)

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See detailLaser overlap joining from copper to aluminum and analysis of failure zone
Mathivanan, Karthik UL; Plapper, Peter UL

Scientific Conference (2019, June 26)

Joining of copper and aluminum sheets are very crucial for battery application. When joining from copper sheet, keyhole mode of welding is essential to overcome the reflectivity and melting threshold of ... [more ▼]

Joining of copper and aluminum sheets are very crucial for battery application. When joining from copper sheet, keyhole mode of welding is essential to overcome the reflectivity and melting threshold of copper. However, in dissimilar material interaction the resulting intermetallic (IMC) phases are brittle, which result in reduced performance.This paper analyses the joint with laser beam irradiated from the copper side (Cu on top). The idea is to distribute the intermetallic compounds inside the joint to obtain a ductile behavior. The zones of failure and the distribution of the intermetallic phase is studied. The microstructural analysis of the fusion zone and mechanical strength of the joint are presented. [less ▲]

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See detailThe real problem with Rawisian reasonableness
Burks, Deven UL

Scientific Conference (2019, June 26)

Reactions to Rawlsian “reasonableness” range from its being “loaded” (Stout 2004: 184) or “chimerical” (Young 2005: 308) to “entirely circular” (Mulhall and Swift 2003: 483). Yet more critical reactions ... [more ▼]

Reactions to Rawlsian “reasonableness” range from its being “loaded” (Stout 2004: 184) or “chimerical” (Young 2005: 308) to “entirely circular” (Mulhall and Swift 2003: 483). Yet more critical reactions often employ external standards or equivocal senses of reasonableness to their detriment (Freeman 2004: 2045, 2063-5). In this paper, I put forward a narrow, immanent criticism whereon the two basic aspects of reasonableness are shown to be in tension: the “burdens of judgment” may give the person reason to disagree over the need to propose and to abide by a common basis of fair terms of cooperation. I proceed in two steps. First, I shall recall the two aspects of reasonableness and hold that their conjunction is necessary for a person to qualify as “reasonable”. In particular, this involves showing a biconditional: a person is reasonable if and only if the two basic aspects of reasonableness obtain. Secondly, I shall examine whether any burden gives reason to doubt the need to propose and to abide by a common basis of fair terms of cooperation. I find that each of the burdens, in its own way, leaves room to doubt whether reasonable persons in a well-ordered society would assent to such a need. For the first burden (complexity of evidence), the evidence backing the requirement of shared terms of cooperation defined ex ante is not obviously less complex than that contained in reasonable comprehensive doctrines. Regarding the second (relative weight of reasons), even supposing agreement on which reasons are relevant to deciding questions of justice, there may be still be disagreement over the relative priority of those reasons in deciding a given question. As to the third (conceptual indeterminacy and hard cases), such concepts as justice and fairness, cooperation and equality are all subject to the difficulties of identifying hard cases and probing a concept’s limits. Of the fourth (divergent total life experience), it is clear that, through her life experience, a person acquires a set of beliefs (political, moral, epistemological, religious, etc.) which could give the person reason to doubt or otherwise reject the first basic aspect of reasonableness, especially given its significant complexity. Finally, for the fifth burden (conflicting distinct normative considerations), persons may disagree over whether the first basic aspect in fact realizes these different considerations, the priority ordering to be fixed for such considerations and whether a common currency might be found so as to make such considerations commensurable, any of which may suffice for persons to be unable to reach agreement on the requirement, not simply on the reasons why it holds, but also on whether it holds at all. Thus, I parallel Clarke’s (1999: 639-41) claim that the burdens of judgment apply both to contractarianism’s “reasonable rejection procedure” and principles but do so from narrower, immanent grounds. This analysis yields two striking conclusions. First, public reason becomes looser and shifts to the domain of politics where one sees what public reasons others may in fact accept (Laden 2001). Seen from a different angle, one need not accept the idea that the first basic aspect and, hence, Rawlsian reasonableness are necessary conditions of political justification under conditions of reasonable pluralism (contra Krasnoff 2014: 696-7): rejecting this aspect and reasonableness in no way means that there can be no political justification under conditions of (reasonable) pluralism. Second, when conceiving justification and discourse, Rawls may be committed, despite himself, to accepting “reasonableness pluralism”, i.e. the view that there exist distinct, possibly irreconcilable accounts of reasonableness to which one may appeal when conceiving justification and discourse. Their combination may lead to a public reason liberalism framework which is at once looser and more actionable. [less ▲]

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See detailRécits visuels de la Grande Guerre au Luxembourg : cent ans de manuels d'histoire
Camarda, Sandra UL; Scuto, Denis UL

Scientific Conference (2019, June 26)

Detailed reference viewed: 61 (7 UL)
See detailHistory of networks: evolution, issues, challenges
Schafer, Valerie UL

Scientific Conference (2019, June 26)

This conference described and analyzed the recent evolutions in the field of the history of Internet and of the Web, underlining new trends and challenges.

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See detailWhat Is a Successful Career in Tourism and Hospitality Academia?
Gewinner, Irina UL

Scientific Conference (2019, June 25)

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See detailSimulation-based optimization using multi-agent technology for efficient and flexible production planning and control in remanufacturing
Groß, Sebastian UL; Gerke, Wolfgang; Plapper, Peter UL

in International Conference on Remanufacturing (ICoR) 2019 (2019, June 25)

Remanufacturing is a process for used products to make them “as good as new or better”. A remanufacturing system typically consists of the processes disassembly, cleaning, inspection, reconditioning ... [more ▼]

Remanufacturing is a process for used products to make them “as good as new or better”. A remanufacturing system typically consists of the processes disassembly, cleaning, inspection, reconditioning reassembly and testing. Due to unknown condition of the used products many challenges occur which are special to the domain of remanufacturing and not know from manufacturing. The resulting stochastic routing of products and material in particular places special demands on the flexibility of the production planning and control (PPC) in remanufacturing systems. In order to enable stochastic routing, Automated Guided Vehicles (AGVs) are used, which also contributes to increasing the complexity of the PPC. Especially the simultaneous scheduling of machines and AGVs has to be addressed in order to enable an optimal remanufacturing process. This paper provides an overview about current research activities in the field of PPC in remanufacturing and scheduling approaches for AGVs. Furthermore, a promising approach to enable the required flexibility of the remanufacturing system and to control the dynamics contained therein is the use of a multi-agent technology. The proposed approach consists of an optimization of the PPC using a multi-agent based simulation. The multi agent-based simulation consists of intelligent agents that negotiate with each other in order to find an optimal solution and achieve high flexibility. [less ▲]

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