References of "Scientific congresses, symposiums and conference proceedings"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailWhat Is a Successful Career in Tourism and Hospitality Academia?
Gewinner, Irina UL

Scientific Conference (2019, June 25)

Detailed reference viewed: 9 (1 UL)
Full Text
Peer Reviewed
See detailBenefits, challenges, social learning and controversies around Local Food Systems
Reckinger, Rachel UL; Nemes, Gusztav; Lajos, Veronika

Scientific Conference (2019, June 25)

Objectives: Our WG touches upon three main elements among the themes of the conference: (1) innovation, (2) social justice and (3) knowledge production. Innovative local food systems and alternative food ... [more ▼]

Objectives: Our WG touches upon three main elements among the themes of the conference: (1) innovation, (2) social justice and (3) knowledge production. Innovative local food systems and alternative food networks, approached from a collaborative and participatory angle, bring about a cultural shift by associating prosumers through a renewed form of trust, reciprocity and community, thus reinforcing social and ecological justice. At the same time, such heterodox actors in the transition to more sustainable food systems create new forms of knowledge, that are contested, co-constructed and potentially conflictual – along with enabling or disabling policymaking and, often, in dialogue with research. Our main objective is in this topic to start the process of creating an edited special issue of a peer reviewed journal (Sociologia Ruralis, Studies of Agricultural Economics or similar) should raise from this WG. We invite researchers working in the area of (local) food systems, alternative food networks, short food supply chains and related topics (rural tourism, community supported agriculture, etc.). We consider both the benefits and possible conflicts/problems in the connected socio-economic, cultural and environmental processes and welcome theoretical papers and case studies, too. Topic: By welcoming case studies from all geographical areas, in a comparative manner, this Working Group’s aim is to address different understandings and dynamics happening within and around different types of Local Food Systems (LFS). Alternative food networks, local food systems and short food supply chains have long been viewed as a sustainable, green way of raising the value added and creating opportunities for sur/re-vival of rural economy and society. They induce many benefits in terms of environmental impact, cultural exemplification, ethical entrepreneurship, social justice or rural development. Conceptually, LFS can be understood as ‘local food for local people’, as for example in the Slow Food or the community supported agriculture (CSA) movements. They are then associated with low food miles, environmental protection (Jones 2002), enhanced social networks and revitalised local communities (Fenstra 1997). From a local economic development perspective, in particular when LFS produce high quality products, they can equally be considered as ‘local food for non-local people’, either transported to urban centres, or attracting flows of tourists into rural areas. Here LFS can still enhance local businesses, economic and rural development, yet social and environmental benefits (Guthman 2004) of such foodstuffs, marketed with the added value of environmental and social responsibility, are more difficult to trace. Therefore, besides benefits, we would also like to analyse potential dissonances, that the distinction between local or extra-local target groups help to identify – for instance: • established, certified organic producers might criticize non-certified yet organically producing CSAs as fragmenting an already minority market or showing a lack of solidarity by not contributing to organic labels; • when LFS end up producing high quality, expensive products, a dynamic of social exclusion might occur, favoring the wealthy; • enhanced local production, tourism, and visitor pressure can cause social, economic, and environmental degradation, multiplier effects do not always occur to build more businesses and sustain social and economic capital; • innovative alternative food networks tend to struggle with territorial competition over land and resources, but if they rely on external investments, they might additionally be confronted – more insidiously – with the risk of co-option by neoliberal corporate agendas. We welcome analyses focusing on negotiations and struggles among actors in a multifaceted foodscape, where some block and some enhance transitions. Viewing the relationships, interconnectedness and agency of niche innovations, local and non-local appropriations as well regime hegemonies opens up the theoretical perspective of contested knowledge claims. We look for questions and answers including: • How are dynamics of “knowing and growing food in a contested arena” (Goodman, DuPuis, Goodman, 2014) negotiated – sometimes in a mutually enhancing and locally beneficial way, sometimes in more conflictual ways? • What are the local and extra-local stakeholders’ (producers, intermediaries, customers, tourists) different and often conflicting interests and responsibilities in LFS? • What can we learn from the tensions and local problems of LFS in order to support relevant policies to solve current controversies within the sector? • How can rural sociologists use their knowledge and influence to support local rural stakeholders of LFS? [less ▲]

Detailed reference viewed: 193 (8 UL)
Full Text
Peer Reviewed
See detailCharacterizations and enumerations of classes of quasitrivial n-ary semigroups
Devillet, Jimmy UL; Couceiro, Miguel

Scientific Conference (2019, June 23)

Detailed reference viewed: 79 (4 UL)
Full Text
Peer Reviewed
See detailOverestimation of physical activity among young people: Does age and gender play a role?
Eckelt, Melanie UL; Hutmacher, Djenna UL; Steffgen, Georges UL et al

Scientific Conference (2019, June 22)

Background and purpose: Due to the continuous decrease of physical activity (PA) of people in industrialized countries (Kohl et al., 2012), PA behavior and its psychological foundations has become a key ... [more ▼]

Background and purpose: Due to the continuous decrease of physical activity (PA) of people in industrialized countries (Kohl et al., 2012), PA behavior and its psychological foundations has become a key issue in health-related research. Studies show that most people tend to overesti-mate their habitual PA (Skender et al., 2016), however, there is very little research on the role of demographic variables in this respect. Therefore, the aim of this study was to examine whether age and/or gender affect the (over)estimation of PA among children and adolescents. Methods: Data of 75 students (38 girls and 37 boys, 10 to 18 years) of various primary and sec-ondary schools were randomly included in the study. Habitual PA was assessed through an online self-report questionnaire (Schmidt et al., 2017) as well as by wearing an accelerometer (Acti-Graph GT3X-BT) over seven consecutive days. A multiple regression analysis was used to ana-lyze the impact of age and gender on the accuracy of PA estimation. Results: The students reported being active for at least 60 minutes on average on 4,0 ± 2,1 days per week, whereas the accelerometer data verify only 1,8 ± 1,6 days per week. Thus, a majority of 76% of the children and adolescents overestimated and 9% underestimated their PA. Almost 15% were correct in their PA estimation. However, results of the regression analysis indicate neither an effect of age ( = .003, p > .1) nor of gender ( = -.070, p > .1). Conclusions: Overestimation of PA is common not only among adults but also among children and adolescents. However, this misperception appears to be independent of age and gender, at least in the age group considered here. Future studies should examine further demographic and psychological variables in order to explain why most of the people significantly overestimate their habitual PA. [less ▲]

Detailed reference viewed: 120 (2 UL)
Full Text
Peer Reviewed
See detailAnytime Approximation in Probabilistic Databases via Scaled Dissociations
Van den Heuvel, Maarten; Ivanov, Peter; Gatterbauer, Wolfgang et al

in Proceedings of the 2019 International Conference on Management of Data, SIGMOD Conference 2019, Amsterdam, The Netherlands, June 30 - July 5, 2019 (2019, June 22)

Detailed reference viewed: 18 (1 UL)
Full Text
Peer Reviewed
See detailThe Werner Report: Principles, Values and Challenges for a Europe Built through Currency
Danescu, Elena UL

Scientific Conference (2019, June 20)

The work of the Werner Committee, which in October 1970 resulted in a plan for an economic and monetary union (the Werner Report), was characterised by political and doctrinal differences between ... [more ▼]

The work of the Werner Committee, which in October 1970 resulted in a plan for an economic and monetary union (the Werner Report), was characterised by political and doctrinal differences between ‘economists’ and ‘monetarists’. At issue was the question of whether monetary integration was the means or the ultimate goal of economic integration. On one side, there were the ‘monetarists‘ (whose standard-bearers were the countries with weak currencies – France, Belgium and, to a certain extent, Italy), who argued for ‘institutions‘. The priority should be to set up institutions and lay down requirements to be met. After that, there would be a coordinating of economic policies, driven forward by concerted action on the single currency which would already exist. The only way to give any credibility to the prospect of monetary union and influence the behavior of players in the economy was to set a timetable and lay down some rules of conduct. On the other side were the ‘economists‘ (the countries with strong currencies – Germany and the Netherlands). According to them, a convergence of economic policies — monetary and budgetary policies — was vital and must come before the setting up of institutions. A single currency would come only at the end of the process, as the ‘finishing touch‘ to a harmonization which would already have been carried out. This dispute was ultimately resolved by the adoption of a parallel approach between economic cooperation and monetary coordination in the Member States, a principle of balance on the basis of which Pierre Werner (Prime Minister of Luxembourg and chairman of the expert committee) was able to secure a consensus. This paper makes extensive use of Pierre Werner’s previously unpublished archives and original interviews, adopting an interdisciplinary approach in order to analyse the negotiations within the Werner Committee by examining the relationships between the members of the group, the emergence of their views on EMU, their political commitment to a European currency, the similarities and differences between their ideas, their personal networks, the influence of the states they represented, their theoretical and methodological input and their contribution to the political consensus. The paper demonstrates how transnational, network-based cooperation led to the emergence of a monetary elite, which had a significant influence both on the transfer of political ideas and solutions within the Member States and also on the decision-making process at supranational level in the area of European economic and monetary integration in the 1970s. Elite transnational networks and the consensuses they reinforce, cultivate, and disseminate, are critical to our understanding of progress and change in world politics. [less ▲]

Detailed reference viewed: 63 (1 UL)
Full Text
Peer Reviewed
See detailTaxation in Benelux countries
Danescu, Elena UL

Scientific Conference (2019, June 20)

The aim of this paper is to perform a comparative historical analysis of the development and specific characteristics of taxation in Luxembourg, as developed in a multidimensional context – national ... [more ▼]

The aim of this paper is to perform a comparative historical analysis of the development and specific characteristics of taxation in Luxembourg, as developed in a multidimensional context – national (Luxembourg), regional (relations with traditional partners – Belgium and the Netherlands but also Germany and France), European (ECSC, EEC and EU) and international (OECD, GATT/WTO) – in the second half of the 20th century. The two aspects of taxation will be addressed: direct taxation (a prerogative of states) and indirect taxation (subject to international regulation). The time frame stretches from the end of the war (1944) to the Maastricht Treaty (1992). [less ▲]

Detailed reference viewed: 45 (0 UL)
Peer Reviewed
See detail"Are you a boy or girl?" Who are the non-responders
Heinz, Andreas UL; Catunda, Carolina UL; van Duin, Claire UL et al

Scientific Conference (2019, June 20)

Background: In many studies, participants who do not state their gender are excluded from the analysis. This may be appropriate if they do not answer the questionnaire seriously. However, some ... [more ▼]

Background: In many studies, participants who do not state their gender are excluded from the analysis. This may be appropriate if they do not answer the questionnaire seriously. However, some participants may have understandable reasons for not reporting their gender, e.g. questioning their gender identity. Objective: How many students and which students do not answer the question on gender? Methods: HBSC 2018 raw data from Ireland, Luxembourg, Belgium and France are compared. To explore the reasons for non-response, we divided the participants into 3 groups: 1. Responders answered both sociodemographic questions (age and gender) 2. age non-responders did not answer the question on age. 3. Gender non-responders answered the question on age, but not the one on gender. Results: Between 0.8% (Ireland) and 1.2% (Luxembourg) of participants did not report their gender. About half of them did not answer the age question either. However, the other half belong to the group of gender non-responders and this group is disadvantaged compared to responders: they report lower life satisfaction, lower self-rated health, more health complaints, less peer support and their WHO-5 Well-being score is lower. Not answering the question on gender is rare. If the participants answered the question on age, but not the question on gender, then the variable gender is missing not at random. Implication: The question arises whether the group of gender non-responders should be included in the analysis and whether the question on gender should be asked differently in the future. [less ▲]

Detailed reference viewed: 155 (14 UL)
See detail„What’s a normal weight?“ – Weight assessment standards in Origin- and Receiving Country and Immigrant Adolescents’ Weight-Status Self-Assessment
Kern, Matthias Robert UL; Heinz, Andreas UL; Stevens, Gonneke et al

Scientific Conference (2019, June 19)

Background: Many young people struggle with correctly assessing their weight-status, often leaving over- or underweight to go unnoticed thereby preventing adequate intervention. The prevalence of weight ... [more ▼]

Background: Many young people struggle with correctly assessing their weight-status, often leaving over- or underweight to go unnoticed thereby preventing adequate intervention. The prevalence of weight-status misperception differs considerably cross-nationally, indicating that individual weight-status assessment is informed by culturally transmitted standards of evaluation. For adolescents with a migration background, this brings up the problem of multiple frames of reference, as their perception of weight-status may be influenced by different cultural standards. Objective: We investigate the extent to which the assessment of one's own weight-status is based on standards of the heritage country or the receiving country. Methods: Data are retrieved from the 2014 Health Behaviour in School-Aged Children study. The cross-national design of the study enabled us to aggregate weight-evaluation standards for 41 countries and subsequently identify a large sample of 8132 immigrant adolescents in 23 receiving countries from 41 heritage countries. The influence of heritage- and receiving country standards of evaluation was assessed using cross-classified multilevel models. Results: Descriptive analyses reveal considerable differences in weight-evaluation standards between the countries. We find evidence of a significant influence of both heritage- and receiving culture standards of evaluation, with a stronger impact of receiving culture standards. Stratified analyses reveal a stronger influence of heritage culture standards among first- than among second-generation immigrants, and a stronger influence of receiving culture standards among second- than among first-generation immigrants. Conclusions: The results corroborate our expectations regarding the persistency of cultural standards and help to understand inter-ethnic differences in weight-status assessment. [less ▲]

Detailed reference viewed: 76 (11 UL)
Peer Reviewed
See detailTrajectories of Steel – The Making Of A Transnational Migrant Community
Santana, Dominique UL

Scientific Conference (2019, June 18)

Detailed reference viewed: 37 (3 UL)
See detailLuxCube the First CubeSat Student Satellite in Luxembourg
Rabbadan Santana, E; Weiss, T; Djordjevic, A et al

Poster (2019, June 15)

Detailed reference viewed: 17 (0 UL)
See detailSSM Sanctions between Administrative and Criminal Law
Allegrezza, Silvia UL

Scientific Conference (2019, June 13)

Detailed reference viewed: 92 (0 UL)
See detailPhase field fracture model for viscoplastic materials in large deformations
Kabore, Brice Wendlassida UL; Loew, Pascal Juergen UL; Peters, Bernhard UL

Scientific Conference (2019, June 13)

Phase-field modeling approach to material fracture and damage has received a growing interest among researchers. It has proven to be an effective way to address crack related discontinuities in continuum ... [more ▼]

Phase-field modeling approach to material fracture and damage has received a growing interest among researchers. It has proven to be an effective way to address crack related discontinuities in continuum mechanics. Also, it solves the problem related to tracking the fracture surface by simply representing the fracture phase with a continuous field variable. Recently, phase-field fracture models have been extended to finite deformations, crack nucleation and applied to complex material behaviors such as plasticity and viscoplasticity. In this contribution we describe a viscoplastic model coupled with a phase-field dynamic fracture model in a large strain formulation. The model include damage, history, rate and temperature dependent behavior. A finite element implementation is presented in a staggered time integration. Moreover, we address the crack closure and crack surfaces interpenetration taking into account tension-compression strength asymmetry. Performance of the model on dynamic crack propagation are presented. [less ▲]

Detailed reference viewed: 89 (8 UL)
Full Text
See detailUser Experience challenges for designing and evaluating Computer-Based Assessments for children
Lehnert, Florence Kristin UL

in IDC '19 Proceedings of the 18th ACM International Conference on Interaction Design and Children (2019, June 12)

Computer-Based Assessment (CBA), i.e., the use of computers instead of paper & pencil for testing purposes is now increasingly used, both in education and in the workforce. Along with this trend, several ... [more ▼]

Computer-Based Assessment (CBA), i.e., the use of computers instead of paper & pencil for testing purposes is now increasingly used, both in education and in the workforce. Along with this trend, several issues regarding the usage of computers in assessment can be raised. With respect to CBA, test validity and acceptance appear at stake during interacting with a complex assessment system. For instance, individual differences in computer literacy (i.e. ability to handle technology) might cause different outcomes that are not related to the problem-solving task. Prior investigation has shown that there is a scarcity of research on the User Experience (UX) in the context of CBA, also due to a focus on adult users. This doctoral thesis aims to adapt and develop new evaluation methods from the Human-Computer Interaction (HCI) field, applied in the context of CBA. The contributions will result in the development of best practices guidelines for both research and practitioners by adopting design and evaluation methods drawn from the field of Child-computer Interaction (CCI). [less ▲]

Detailed reference viewed: 107 (5 UL)
Full Text
Peer Reviewed
See detailAn enhanced interface model for friction fatigue problems of axially loaded piles
Kullolli, Borana; Baeßler, Matthias; Cuéllar, Pablo et al

in Proceedings of the ASME 2019 38th, International Conference on Ocean, Offshore and Arctic Engineering, Glasgow 9-14 June 2019 (2019, June 09)

The shaft bearing capacity often plays a dominant role for the overall structural behaviour of axially loaded piles in offshore deep foundations. Under cyclic loading, a narrow zone of soil at the pile ... [more ▼]

The shaft bearing capacity often plays a dominant role for the overall structural behaviour of axially loaded piles in offshore deep foundations. Under cyclic loading, a narrow zone of soil at the pile-soil interface is subject to cyclic shearing solicitations. Thereby, the soil may densify and lead to a decrease of confining stress around the pile due to micro-phenomena such as particle crushing, migration and rearrangement. This reduction of radial stress has a direct impact on the shaft capacity, potentially leading in extreme cases to pile failure. An adequate interface model is needed in order to model this behaviour numerically. Different authors have proposed models that take typical interface phenomena in account such as densification, grain breakage, normal pressure effect and roughness. However, as the models become more complex, a great number of material parameters need to be defined and calibrated. This paper proposes the adoption and transformation of an existing soil bulk model (Pastor- Zienkiewicz) into an interface model. To calibrate the new interface model, the results of an experimental campaign with the ring shear device under cyclic loading conditions are here presented. The constitutive model shows a good capability to reproduce typical features of sand behaviour such as cyclic compaction and dilatancy, which in saturated partially-drained conditions may lead to liquefaction and cyclic mobility phenomena. [less ▲]

Detailed reference viewed: 91 (5 UL)
Full Text
See detailLe rôle du Pôle Européen de Développement entre le Luxembourg, la Belgique et la France dans l’émergence d’un territoire transfrontalier
Pigeron-Piroth, Isabelle UL; Belkacem, Rachid

Scientific Conference (2019, June 07)

Au pays des trois frontières (Athus en Belgique, Longwy en France, Pétange au Luxembourg), ces territoires ont connu une histoire commune du déclin industriel. Dans le cadre de programme européen de ... [more ▼]

Au pays des trois frontières (Athus en Belgique, Longwy en France, Pétange au Luxembourg), ces territoires ont connu une histoire commune du déclin industriel. Dans le cadre de programme européen de reconversion de ces espaces, l'implantation d'un pôle européen de développement au milieu des années 1980, a constitué le principal instrument de reconversion de ces territoires. Après 20 ans de fonctionnement, le PED a produit différents effets sur la structuration de ces territoires transfrontaliers : une diversification inégale de part et d'autre des frontières du tissu productif local, une accélération des mobilités transfrontalières avec le développement du travail frontalier, un accroissement de la population locale avec de nouveaux profils sociologiques qui marque de nouvelle logique de mobilité résidentielle, ... Si le PED a permis d'amortir fortement la crise du système productif local, il a néanmoins contribué à diversifier les trajectoires de développement territorial de part et d'autre des frontières. On voit se dessiner au pays des trois frontières, un nouveau modèle de segmentation territoriale traduisant la juxtaposition de zones d'activités dynamiques d'un côté de la frontière avec des territoires à vocation résidentielle de l'autre côté de la frontière. [less ▲]

Detailed reference viewed: 53 (2 UL)
Peer Reviewed
See detailNetworks and Governance of Local Food Systems. The case of Food Policy Councils
Reckinger, Rachel UL

Scientific Conference (2019, June 06)

Detailed reference viewed: 85 (5 UL)
See detailA Socially Balanced European Economic Governance?
Muñoz, Susana UL

Scientific Conference (2019, June 06)

Detailed reference viewed: 22 (1 UL)
See detailMagnetic neutron scattering studies on Nd-Fe-B magnets (Keynote Lecture)
Michels, Andreas UL

Scientific Conference (2019, June 05)

Detailed reference viewed: 58 (1 UL)
Full Text
See detailInvestment fund performance validation - Vine copulae estimation using a minimum spanning tree
Petijean, Simon; Schiltz, Jang UL

Scientific Conference (2019, June 03)

Catching the dependencies between financial time series is a complex exer- cise with a lot of challenges, both of theoretical and practical nature. We develop a metho- dology to model portfolio dynamics ... [more ▼]

Catching the dependencies between financial time series is a complex exer- cise with a lot of challenges, both of theoretical and practical nature. We develop a metho- dology to model portfolio dynamics using the minimum spanning tree methods combined with econometric models which solves a good part of these challenges. We use a tracking error that is equivalent to the Euclidean distance, to cluster the closest market indices. Financial risk is difficult to manage, because risk is evolving constantly and depends on very different factors like volatility, liquidity, asset class etc. To capture this evolution we develop a recursive portfolio validation method that reveals the true nature of the evolution of the risk structure of financial portfolios. We investigate several portfolio strategies to understand the dynamics behind the holdings. We thus validate the results of our portfolio analysis. We use a vine copula construction, which allows us to separate the marginal estimation from the dependence estimation and calibrate the underlying dynamics very precisely. The minimum spanning tree method helps us to create a robust tree foundation to support the entire vine structure. Starting from a portfolio analysis, we are thus able to validate the portfolio valuation over a specific period of time. [less ▲]

Detailed reference viewed: 39 (0 UL)
Full Text
See detailŽidé, identita, domov a rodinné dědictví
Bronec, Jakub UL

Scientific Conference (2019, June 01)

Detailed reference viewed: 46 (0 UL)
Full Text
Peer Reviewed
See detailDeep learning based semantic situation awareness system for multirotor aerial robots using LIDAR
Sanchez Lopez, Jose Luis UL; Sampedro, Carlos; Cazzato, Dario UL et al

in 2019 International Conference on Unmanned Aircraft Systems (ICUAS) (2019, June)

In this work, we present a semantic situation awareness system for multirotor aerial robots, based on 2D LIDAR measurements, targeting the understanding of the environment and assuming to have a precise ... [more ▼]

In this work, we present a semantic situation awareness system for multirotor aerial robots, based on 2D LIDAR measurements, targeting the understanding of the environment and assuming to have a precise robot localization as an input of our algorithm. Our proposed situation awareness system calculates a semantic map of the objects of the environment as a list of circles represented by their radius, and the position and the velocity of their center in world coordinates. Our proposed algorithm includes three main parts. First, the LIDAR measurements are preprocessed and an object segmentation clusters the candidate objects present in the environment. Secondly, a Convolutional Neural Network (CNN) that has been designed and trained using an artificially generated dataset, computes the radius and the position of the center of individual circles in sensor coordinates. Finally, an indirect-EKF provides the estimate of the semantic map in world coordinates, including the velocity of the center of the circles in world coordinates.We have quantitative and qualitative evaluated the performance of our proposed situation awareness system by means of Software-In-The-Loop simulations using VRep with one and multiple static and moving cylindrical objects in the scene, obtaining results that support our proposed algorithm. In addition, we have demonstrated that our proposed algorithm is capable of handling real environments thanks to real laboratory experiments with non-cylindrical static (i.e. a barrel) and moving (i.e. a person) objects. [less ▲]

Detailed reference viewed: 40 (1 UL)
Peer Reviewed
See detailResilience and innovative work behaviours of entrepreneurs: The moderating role of gender
Geraudel, Mickaël UL; Cesinger, Beate; Gundolf, Katherine et al

Scientific Conference (2019, June)

Detailed reference viewed: 67 (0 UL)
Peer Reviewed
See detailRe-thinking untraceability in the CryptoNote-style blockchain
Yu, Jiangshan; Au, Man Ho Allen; Verissimo, Paulo UL

Scientific Conference (2019, June)

We develop new foundations on transaction untrace- ability for CryptoNote-style blockchain systems. In particular, we observe new attacks; develop theoretical foundations to model transaction ... [more ▼]

We develop new foundations on transaction untrace- ability for CryptoNote-style blockchain systems. In particular, we observe new attacks; develop theoretical foundations to model transaction untraceability; provide the least upper bound of transaction untraceability guarantee; provide ways to efficiently and automatically verify whether a given ledger achieves optimal transaction untraceability; and provide a general solution that achieves provably optimal transaction untraceability. Unlike previous cascade effect attacks (ESORICS’ 17 and PETS’ 18) on CryptoNote-style transaction untraceability, we consider not only a passive attacker but also an active adaptive attacker. Our observed attacks allow both types of attacker to trace blockchain transactions that cannot be traced by using the existing attacks. We develop a series of new games, which we call “The Sun-Tzu Survival Problem”, to model CryptoNote-style blockchain transaction untraceability and our identified attacks. In addition, we obtain seven novel results, where three of them are negative and the rest are positive. In particular, thanks to our abstract game, we are able to build bipartite graphs to model transaction untraceability, and provide reductions to formally relate the hardness of calculating untraceability to the hardness of calculating the number of perfect matchings in all possible bipar- tite graphs. We prove that calculating transaction untraceability is a #P−complete problem, which is believed to be even more difficult to solve than NP problems. In addition, we provide the first result on the least upper bound of transaction untraceability. Moreover, through our theoretical results, we are able to provide ways to efficiently and automatically verify whether a given ledger achieves optimal transaction untraceability. Furthermore, we propose a simple strategy for CryptoNote-style blockchain systems to achieve optimal untraceability. We take Monero as a concrete example to demonstrate how to apply this strategy to optimise the untraceability guarantee provided by Monero. [less ▲]

Detailed reference viewed: 125 (8 UL)
Full Text
See detailA survey: Scheduling of Automated Guided Vehicles in Flexible (Re-)Manufacturing Systems
Groß, Sebastian UL; Gerke, Wolfgang; Plapper, Peter UL

in Müller, Rainer; Brüls, Oliver; Abba, Gabriel (Eds.) et al Robotix-Academy Conference for Industrial Robotics (RACIR) 2019 (2019, June)

This work gives a state-of-the-art overview regarding the scheduling of Automated Guided Vehicles (AGV) in Flexible (Re-)Manufacturing Systems (FMS/FRMS). Different, general approaches are available to ... [more ▼]

This work gives a state-of-the-art overview regarding the scheduling of Automated Guided Vehicles (AGV) in Flexible (Re-)Manufacturing Systems (FMS/FRMS). Different, general approaches are available to solve this task. In this regard an overview of currently available fleet management software and research in this field as well as the simultaneous scheduling of machines and AGVs is given. Production scheduling and transport scheduling have been vastly studied by many researchers, but most of the works address these both problems separately. However, these two problems are closely linked and influence each other. By looking at them together, it is possible to achieve an improvement in the overall scheduling. The different works are examined regarding the consideration of one available machine for each tasks, or if alternative machines are available and if the approaches are static or dynamic. Especially the appropriability of the presented works regarding the use in remanufacturing systems is examined. Remanufacturing is a process for used products to make them “as good as new or better”. Due to unknown condition of the used products many challenges occur during the remanufacturing process 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 and dynamic of the scheduling and control of the remanufacturing system. In order to meet the challenges of a real remanufacturing system, the scheduling algorithm should consider alternative machines as well as be dynamic. None of the approaches examined can meet these requirements, which is why new methods have to be developed. [less ▲]

Detailed reference viewed: 132 (0 UL)
Full Text
Peer Reviewed
See detailMixed hybrid and electric bus dynamic fleet management in urban networks: a model predictive control approach
Rinaldi, Marco UL; Picarelli, Erika UL; D'Ariano, Andrea et al

Scientific Conference (2019, June)

Abstract—Reducing pollutant emissions and promoting sustainable mobility solutions, including Public Transport, are increasingly becoming key objectives for policymakers worldwide. In order to jointly ... [more ▼]

Abstract—Reducing pollutant emissions and promoting sustainable mobility solutions, including Public Transport, are increasingly becoming key objectives for policymakers worldwide. In order to jointly achieve these goals, careful consideration should be put on the operational cost and management of PT services, in order to promote the adoption of green mobility solutions and advanced management techniques by operators. In this work we develop a dynamic fleet management approach for next generation Public Transportation systems, considering the instance of mixed electric / hybrid fleet. Our objective is that of investigating to what extent electrification, coupled with optimal fleet management, can yield operational cost savings for PT operators, explicitly considering real-time disturbances, including delays, service disruptions etc. We propose a Mixed Integer Linear Program to address the problem of optimal scheduling of a mixed fleet of electric and hybrid / non-electric buses, and employ it as predictor in a Model Predictive Control approach. Test results based upon a real-life scenario showcase how the proposed approach is indeed capable of yielding a sizable reduction in operational costs, even when considerable disturbances arise from the underlying system. [less ▲]

Detailed reference viewed: 56 (4 UL)
Full Text
See detailMagnetic Guinier Law
Malyeyev, Artem UL; Michels, Andreas UL

Poster (2019, June)

We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of ... [more ▼]

We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of this novel approach is discussed and the quantities derived are analyzed in the framework of the existing research literature. [less ▲]

Detailed reference viewed: 88 (14 UL)
See detailEine Krise der Öffentlichkeit : Protest, Populismus, "Neue Medien"
Kohns, Oliver UL

Scientific Conference (2019, June)

Detailed reference viewed: 75 (3 UL)
Full Text
Peer Reviewed
See detailDesigning collaborative scenarios on tangible tabletop interfaces - insights from the implementation of paper prototypes in the context of a multidisciplinary design workshop
Sunnen, Patrick UL; Arend, Béatrice UL; Heuser, Svenja UL et al

in Proceedings of the 17th European Conference on Computer-Supported Cooperative Work: The International Venue on Practice-centred Computing and the Design of Cooperation Technologies - Exploratory Papers, Reports of the European Society for Socially Embedded Technologies (2019, June)

Within the context of the research project ORBIT (Overcoming Breakdowns in Teams with Interactive Tabletops), we design and study a joint problem-solving activity at an interactive tabletop, that gives ... [more ▼]

Within the context of the research project ORBIT (Overcoming Breakdowns in Teams with Interactive Tabletops), we design and study a joint problem-solving activity at an interactive tabletop, that gives participants the opportunity to develop their collaboration methods. To gain design insights for the development of a scenario soliciting participants to collaborate, we set up a multidisciplinary design workshop. During the latter, we explored and discussed three different collaborative scenarios, implemented as paper prototypes. In this paper, we report on first results gained from an exploratory analysis of the video data that was recorded in the context of this workshop. [less ▲]

Detailed reference viewed: 107 (13 UL)
Full Text
Peer Reviewed
See detailTowards a high-resolution drone-based 3D mapping dataset to optimise flood hazard modelling
Backes, Dietmar UL; Schumann, Guy; Teferle, Felix Norman UL et al

in International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2019, June), XLII-2/W13

The occurrence of urban flooding following strong rainfall events may increase as a result of climate change. Urban expansion, ageing infrastructure and an increasing number of impervious surfaces are ... [more ▼]

The occurrence of urban flooding following strong rainfall events may increase as a result of climate change. Urban expansion, ageing infrastructure and an increasing number of impervious surfaces are further exacerbating flooding. To increase resilience and support flood mitigation, bespoke accurate flood modelling and reliable prediction is required. However, flooding in urban areas is most challenging. State-of-the-art flood inundation modelling is still often based on relatively low-resolution 2.5 D bare earth models with 2-5m GSD. Current systems suffer from a lack of precise input data and numerical instabilities and lack of other important data, such as drainage networks. Especially, the quality and resolution of the topographic input data represents a major source of uncertainty in urban flood modelling. A benchmark study is needed that defines the accuracy requirements for highly detailed urban flood modelling and to improve our understanding of important threshold processes and limitations of current methods and 3D mapping data alike. This paper presents the first steps in establishing a new, innovative multiscale data set suitable to benchmark urban flood modelling. The final data set will consist of high-resolution 3D mapping data acquired from different airborne platforms, focusing on the use of drones (optical and LiDAR). The case study includes residential as well as rural areas in Dudelange/Luxembourg, which have been prone to localized flash flooding following strong rainfall events in recent years. The project also represents a cross-disciplinary collaboration between the geospatial and flood modelling community. In this paper, we introduce the first steps to build up a new benchmark data set together with some initial flood modelling results. More detailed investigations will follow in the next phases of this project. [less ▲]

Detailed reference viewed: 78 (11 UL)
Full Text
Peer Reviewed
See detailSupply characteristics and membership choice in round-trip and free-floating carsharing systems
Cisterna, Carolina UL; Giorgione, Giulio UL; Cipriani, Ernesto et al

Scientific Conference (2019, June)

Detailed reference viewed: 77 (21 UL)
Peer Reviewed
See detailIs Life Satisfaction Contagious?
Catunda, Carolina UL; Heinz, Andreas UL; van Duin, Claire UL et al

Scientific Conference (2019, June)

Background: Life satisfaction (LS) is a major component of adolescents’ subjective well-being, facilitating adaptive development and influencing health. Literature shows that social support influences ... [more ▼]

Background: Life satisfaction (LS) is a major component of adolescents’ subjective well-being, facilitating adaptive development and influencing health. Literature shows that social support influences adolescents LS. In addition, the social network can affect health-related behaviors of adults - individuals that smoke or exercise tend to group together. However, the effects of others` LS on adolescents’ individual evaluation of LS (the contagion hypothesis) is still to be addressed. Objective(s): To test the contagion hypothesis of adolescents’ life satisfaction (how LS of proxies influences the individual LS appraisal). Method: Data is from 9738 students (aged 9-20) from the 2018 HBSC Luxembourg survey. A multilevel analysis was used to evaluate LS, with the school classes as subjects (model 1) to estimate the influence of being in a certain school class. Later, FAS, age and gender were entered as control variables (model 2). Results: The grand mean (intercept) for LS in model 1 was 7.57 (SE=.03, p<.001). For model 2, FAS (b=.47, SE=.03, p<.001), age (b=-.14, SE=.01, p<.001) and gender (b=-.23, SE=.04, p<.001) were significantly predictive of LS. The grand mean for LS, conditioned on the presence of FAS, age and gender, was 9.02 (SE=.05, p<.001). Interclass Correlation Coefficient decreased from model 1 (ICC=.08) to model 2 (ICC=.04). Conclusions: Results suggest that part of the variance of LS can be explained by the school class level. In other words, school class clusters have an influence on their LS, indicating that the LS of adolescents from a class partially accounts for individual LS. [less ▲]

Detailed reference viewed: 68 (7 UL)
Full Text
Peer Reviewed
See detailLeveraging GIS Data and Topological Information to Infer Trip Chaining Behaviour at Macroscopic Level
Carrese, Filippo; Fusco, Gaetano; Cantelmo, Guido et al

Scientific Conference (2019, June)

One of the open challenges in transport modelling is to estimate within-day demand flows that reflect the complexity of individual activity-travel behaviour. While disaggregate (Activity-Based) demand ... [more ▼]

One of the open challenges in transport modelling is to estimate within-day demand flows that reflect the complexity of individual activity-travel behaviour. While disaggregate (Activity-Based) demand models can recreate realistic daily mobility patterns at an individual level, they usually require an accurate knowledge of individual user behaviour (i.e. via travel surveys), which is not always available. As a result, practitioners often turn to aggregate demand models, that have the advantage of being less demanding in terms of data but typically under represent the demand for secondary activities. In this work, we take research on within-day demand modelling one step forward by proposing a framework that combines traditional methodologies with heterogeneous data sources in order to explicitly represent trip chaining at an aggregated level. We show that the combination of web-based crowd sensed data, network data and behavioural constraints allows to capture complex spatial and temporal correlations between demand patterns. The methodology is applied on the classical Gravity model to show how to incorporate within-day dynamics. Yet, any alternative demand model can be adopted. In our case, Generation and Attraction are used to estimate the systematic demand, that is enriched of information about individual activity patterns, and then a novel definition of impedance function based on Hagestraand ellipse theory plays a central role in spatially distributing locations of trips using geographic relationships and constraints deriving from space-time behaviour. A case study for Luxembourg City has been presented to show the potential of the methodology: the choice of using data from a different spatial context to account for the temporal dimension has been validated through comparisons with official statistics. The results of simulating a workplace relocation show the advantages of this new approach in representing demand related to secondary activities. [less ▲]

Detailed reference viewed: 92 (7 UL)
Peer Reviewed
See detailToward a contingent model of talent management: The case of Aerospace SMEs in Luxembourg
USANOVA, Ksenia; Geraudel, Mickaël UL

Scientific Conference (2019, June)

Detailed reference viewed: 60 (2 UL)
Full Text
Peer Reviewed
See detailMachine Learning based Antenna Selection and Power Allocation in Multi-user MISO Systems
Vu, Thang Xuan UL; Lei, Lei UL; Chatzinotas, Symeon UL et al

in 2019 IEEE International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt) (2019, June)

Detailed reference viewed: 43 (13 UL)
Peer Reviewed
See detailCraving for violence: The role of Dark Personality traits in violent video game preference
Melzer, André UL

Scientific Conference (2019, June)

Background: Violent and antisocial video games are popular, but little is known why players are drawn to these kinds of games. This present research tested whether there is a connection between player ... [more ▼]

Background: Violent and antisocial video games are popular, but little is known why players are drawn to these kinds of games. This present research tested whether there is a connection between player preferences for violent games and characteristics of so called “dark” personality traits. Method: Relying on a user-centered approach, three online studies (N=662) examined the role of “dark” personality traits together with a novel violent game preference short scale. Results: Study 1 and 2 indicated strong correlations between trait aggression and players’ interest in explicit depictions of blood and gore and games that provide experiences of domination and antisocial behavior. In Study 3, the new scale was tested together with participants’ trait aggression, trait empathy, and the Dark Triad traits of psychopathy, Machiavellianism, and narcissism. Games featuring violence and the possibility of antisocial behavior were found to meet the needs of players who lack empathy and show callous, impulsive, and exploitive (but not narcissistic) attributes. Conclusions: Findings of individual motivators for game violence significantly extend the literature that is predominantly focusing on the effects of playing these games. Apparently, game preferences and playing habits fulfill individual needs that are at least partly determined by particular, i.e. “dark”, personality characteristics. [less ▲]

Detailed reference viewed: 398 (2 UL)
Full Text
See detailGrenze als multiple (Sozio-)Materialität
Wille, Christian UL

Scientific Conference (2019, June)

Detailed reference viewed: 80 (3 UL)
Full Text
Peer Reviewed
See detailA real time hybrid controller for regulating bus operations and reducing stops at signals
Laskaris, Georgios UL; Seredynski, Marcin; Viti, Francesco UL

Scientific Conference (2019, June)

We propose a hybrid controller which consists of holding and a Driver Advisory System (DAS). It combines the objectives of seeking the regularization of operation and the reduction of stop and go actions ... [more ▼]

We propose a hybrid controller which consists of holding and a Driver Advisory System (DAS). It combines the objectives of seeking the regularization of operation and the reduction of stop and go actions at signalized intersections. A simple headway based holding criterion is applied at stops to define the time needed to maintain even spaced headways between buses and additionally a speed recommendation is given to traverse during green indication at the downstream signalized intersection. The controller is tested using simulation for a bus line of the city of Luxembourg, Luxembourg and compared to a benchmark scenario, the single application of bus holding, two advisory systems and different levels of transit signal priority. Results show that there are additional benefits compared to traditional holding in terms of regularity while similar performance to strong transit signal priority is achieved in terms of time spent at traffic lights. [less ▲]

Detailed reference viewed: 61 (7 UL)
Peer Reviewed
See detailReading in a new technology environment: Are reading assessments still in the ballpark?
Reichert, Monique UL; Krämer, Charlotte UL; Wollschläger, Rachel UL

Scientific Conference (2019, May 31)

Using digital technologies for daily activities such as communicating or learning has become ubiquitous today. This trend is also clearly visible within the field of reading habits, especially among ... [more ▼]

Using digital technologies for daily activities such as communicating or learning has become ubiquitous today. This trend is also clearly visible within the field of reading habits, especially among adolescents: Recent studies underline that traditional text types (e.g., fiction books) are no longer part of the more commonly read text materials (Duncan et al., 2016). The question addressed in the presentation will deal with the degree to which different reading habits impact on adolescents’ reading competence, and is intended to encourage a discussion about the construct of reading competence as generally operationalized in reading competence assessments. We base our considerations on the analyses of two data sets: The first one deals with the extra-curricular reading habits of 3074 9th grade students, and the impact of these practices on their German reading competence. The corresponding data are taken from a survey regarding their reading habits in terms of ten different types of texts (e.g., non-fiction books, e-mails). A regression analysis reveals the strongest impact on reading competence for narrative texts, whilst reading digital texts – although highly attractive among the students – is found to be of minor importance. The second data set differentiates between the reading habits of around 4500 adolescents regarding 1) traditional (printed) texts, 2) digitalised texts (e.g., e-books), and 3) text types that have emerged with new technologies (e.g., social media texts). The ensuing discussion compares particularities of classical and digital texts, and raises questions concerning the construct of reading competence (to be) targeted by standardized tests. [less ▲]

Detailed reference viewed: 132 (6 UL)
Full Text
Peer Reviewed
See detailMotivationsregulation im Sportunterricht und ihre Relevanz für die körperliche Aktivität in der Freizeit
Hutmacher, Djenna UL; Eckelt, Melanie UL; Bund, Andreas UL et al

Scientific Conference (2019, May 30)

Hintergrund: Angesichts der kontinuierlichen Abnahme der körperlichen Aktivität von Kindern und Jugendlichen erweist sich die Stärkung der Motivation im Sportunterricht als ein bedeutsamer Ansatz zur ... [more ▼]

Hintergrund: Angesichts der kontinuierlichen Abnahme der körperlichen Aktivität von Kindern und Jugendlichen erweist sich die Stärkung der Motivation im Sportunterricht als ein bedeutsamer Ansatz zur Sportaktivierung (Standage, Duda, & Ntoumanis, 2005). Die Selbstbestimmungstheorie (Deci & Ryan, 2000) postuliert, dass ein eher intrinsischer Regulationstyp sowie ein autonomie-förderndes Klima im Sportunterricht die Intention körperlicher Aktivität steigern. Basierend auf dem trans-kontextuellen Modell (Hagger, Chatzisarantis, Culverhouse, & Biddle, 2003) wird in der vorliegenden Studie geprüft, ob der motivationale Regulationstyp aus dem Sportunterricht selbigen hinsichtlich der körperlichen Aktivität im Freizeitbereich vorhersagen kann. Methode: 264 Schüler von 11 bis 21 Jahren (52.6% Mädchen) aus Luxemburg nahmen an der Studie teil. Neben der Bedürfnisunterstützung (Autonomie, Geselligkeit und Kompetenz; Standage, Duda, & Ntoumis, 2005), dem Regulationstyp im Sportunterricht (BPNES; Vlachopoulos, Ntoumanis, & Smith, 2010) sowie zur körperlichen Aktivität in der Freizeit (BREQ-II; Markland & Tobin, 2004) wurde auch die Intention zu körperlicher Aktivität erfasst (Hagger, et al. 2003). Ergebnisse: Eine SEM-Analyse belegt einen signifikanten Zusammenhang zwischen dem intrinsischen Regulationstyp im Sportunterricht und der intrinsischen Regulation zur körperlichen Aktivität in der Freizeit. Letztere erweist sich hierbei als positiver Prädiktor der Intentionsbildung. Zudem geht die Unterstützung der drei Grundbedürfnisse durch den Sportlehrer mit einer signifikant höheren intrinsischen Regulation sowie niedrigeren Amotivation im Sportunterricht einher. Schlussfolgerung: Die Befunde zeigen auf, dass ein intrinsischer Regulationstyp im Sportunterricht kontextübergreifend mit dem Regulationstyp im Freizeitbereich zusammenhängt, welcher wiederum die Aktivitätsintention erhöht. Die Implikationen dieser Befunde für den Sportunterricht werden im Rahmen des Vortrags diskutiert. [less ▲]

Detailed reference viewed: 143 (5 UL)
Full Text
Peer Reviewed
See detailWHY IS THE MARKET SKEWNESS-RETURN RELATIONSHIP NEGATIVE?
Lehnert, Thorsten UL

Scientific Conference (2019, May 30)

Detailed reference viewed: 46 (10 UL)
Full Text
Peer Reviewed
See detailIs the effect of workplace bullying exposure on subjective well-being mediated through the frustration of the need for relatedness? A longitudinal six-wave study.
Sischka, Philipp UL; Steffgen, Georges UL

Scientific Conference (2019, May 30)

Workplace bullying is a serious phenomenon that has serious detrimental effects on victim’s health, attitudes, and work-related behavior. Drawing on self-determination theory, we propose that bullying ... [more ▼]

Workplace bullying is a serious phenomenon that has serious detrimental effects on victim’s health, attitudes, and work-related behavior. Drawing on self-determination theory, we propose that bullying exposure thwarts employee’s need for relatedness with the result of decreased well-being. Studies examining these mechanisms used either a cross-sectional design (Trépanier et al., 2013) or a longitudinal design with (not theoretically justified) long time intervals (i.e., 12-month time lag; Trépanier et al., 2015). Therefore, the aim of our study was to test this mediation in a longitudinal design with much shorter time intervals (i.e. monthly), whether to see if the bullying exposure also shows short-term effects on well-being. A six-wave online survey design with monthly time lag was employed and data were collected among U.S. employees. The sample consists of 1,595 respondents (55.8% females, n=890, ageM = 36.9, ageSD =10.3). Workplace bullying exposure was assessed with the S-NAQ (Notelaers et al., 2018), frustration of the need for relatedness with the Psychological Needs Thwarting Scale (Bartholomew et al., 2011) and well-being with the WHO-5 well-being-index (Topp et al., 2015). Cross-lagged mediation analysis within a structural equation modeling framework confirmed the mediation model: Bullying exposure was significantly related to a change in frustration of relatedness and frustration of relatedness was significantly related to a change in well-being across all waves. The study findings advance the field through showing that bullying exposure has not only a long-term effect on well-being but also a short one, and that this effect is mediated through the frustration of relatedness. [less ▲]

Detailed reference viewed: 10 (0 UL)
Full Text
Peer Reviewed
See detailSocial and behavioral factors in cognitive aging: Applying the causal inference framework in observational studies
Leist, Anja UL

Scientific Conference (2019, May 25)

Rationale: There is an urgent need to better understand how to maintain cognitive functioning at older ages with lifestyle interventions, given that there is currently no medical cure available to prevent ... [more ▼]

Rationale: There is an urgent need to better understand how to maintain cognitive functioning at older ages with lifestyle interventions, given that there is currently no medical cure available to prevent, halt or reverse the progression of cognitive decline and dementia. However, in current models, it is still not well established which social and behavioral modifiable factors (e.g. education, BMI, physical activity, sleep, depression) matter most at which ages, and which behavioral profiles are most protective against cognitive decline. In the last years, advances in the fields of causal inference have equipped epidemiology and social sciences with methods and models to approach causal questions in observational studies. Method: The presentation will give an overview of the causal inference framework to investigate the value of behavior changes in cognitive aging. Motivated by conflicting recent publications if physical activity should or should not be recommended to reduce individual risk of cognitive decline, we emulate a target trial where sedentary people are followed over the course of the Survey of Health, Ageing and Retirement in Europe (SHARE) and compare their cognitive development depending on initiating or not physical activity at a later measurement. Extended inclusion/exclusion criteria, and concepts of incident versus prevalent users and multiple eligibility are introduced. Discussion: The causal inference framework applied to observational studies is able to guide study design to reconcile conflicting evidence from intervention and observational studies. Investigations under the new framework have fewer ethical considerations compared to intervention research and, considering the need to follow up individuals over several decades, are considerably more cost-effective. Limitations are discussed. [less ▲]

Detailed reference viewed: 181 (32 UL)
Peer Reviewed
See detailOlder adult’s mental health networks: first results of the ARPA ageing project regarding expectations and needs of health professionals
Tournier, Isabelle UL; Hanon, Cécile; Vasseur-Bacle, Simon et al

Poster (2019, May 25)

The European project “ARPA ageing” (co-funded by the Erasmus+ strategic partnerships programme) aims to improve the efficiency of mental health networks for older people. In order to have a better ... [more ▼]

The European project “ARPA ageing” (co-funded by the Erasmus+ strategic partnerships programme) aims to improve the efficiency of mental health networks for older people. In order to have a better knowledge of the perceived strengths and weakness of these networks, we investigated by a survey the needs and expectations of health professionals such as geriatrists, nurses or nursing assistants. A questionnaire of 24 items with an estimated duration of 20 minutes was published online from the 1 March 2018 to the 1 April 2018 in Belgium, France, and Luxembourg. Preliminary data concern 90 health professionals (main categories: 15.6% of nurses, 10% of psychologists, 7.8% of geriatricians and 7.8% of nursing assistants) in the domain of mental health and/or elder care. Notably due to the fact that not all participants already worked with health networks, levels of “no answer” varied between 24.4% to 33.3 according the questions. First results on the total sample reveal that health professionals globally perceived health networks as beneficial to a holistic care approach and care continuity (both 51.1%), and to care access (48.9%). These networks were estimated as beneficial to the increase of professional knowledge regarding older adults (38.9%) and mental health (34.4%), and to the improvement of professional skills (38.9%). Main reported difficulties working with these networks were the lack of information about these networks (56.7%) and the related health professions (50.1%), the lack of time and financial compensation (both 36.7%), and of coordinating tools (36.7%). This study is being extended to more participants and countries (i.e., Greece and Romania) in order to have a larger and more representative understanding of the European situation and cultural differences regarding mental health networks. This information will guide the next steps of the ARPA ageing project: the development of a European Internet platform and the production of guidelines to facilitate the implementation and monitoring of efficient mental health networks in Europe. [less ▲]

Detailed reference viewed: 77 (1 UL)
Peer Reviewed
See detailSubjective Reasons for Using versus not Using Assistive Technologies in Aging Population: A Meta-Synthesis of Qualitative Studies
Abri, Diana UL; Boll, Thomas UL

Poster (2019, May 24)

The number of older people with limitations of activities of daily living in developing countries is predicted to increase by a factor of four between 2015 and 2050. One possibility to overcome such ... [more ▼]

The number of older people with limitations of activities of daily living in developing countries is predicted to increase by a factor of four between 2015 and 2050. One possibility to overcome such limitations is to promote the use of assistive technologies (ATs) in the aging population. Despite evident benefits of ATs in this context, the use rate is still low. To find out why this is the case, we performed systematic literature searches in PsycINFO, MEDLINE, and Google Scholar databases about subjective reasons of older people for use and non-use of these devices. We then performed a meta-synthesis of the relevant studies in order to arrive at a comprehensive view of older people’s reasons for the use or non-use of ATs. Beliefs about ease to use and reliability of AT use as well as perceived suggestion by significant others to use ATs were important reasons for using them. Beliefs about insecurity, uselessness and other attributes of ATs as well as desires to avoid burden for others were major reasons for not using of ATs. We systematized the identified subjective reasons for using versus not using as referring to (1) situation of need and demand for an AT, (2) suggestion by significant others, (3) act of using, and (4) consequences of AT use. Most of the reasons were reasons for non-use such as beliefs about negative attributes of ATs, and the consequences of their use. In contrast, desires were only rarely mentioned as reasons for use or non-use of ATs. Comparing subjective reasons of our meta-synthesis with predictors in ATs use models, we found that only 5 out of 25 identified subjective reasons have already been considered in these models. Thus, these models appear not yet to be sufficiently comprehensive. We suggest integrating the identified subjective reasons from our meta-synthesis as additional predictors in a comprehensive AT use model with an improved predictive power. [less ▲]

Detailed reference viewed: 87 (14 UL)
Full Text
Peer Reviewed
See detailAgeing and Care in Cultural Perspective
Albert, Isabelle UL

Scientific Conference (2019, May 24)

Population ageing and migration are key issues in many societies today. Despite globalisation and cultural contact, cultures still differ in their ideas and expectations with respect to ageing and late ... [more ▼]

Population ageing and migration are key issues in many societies today. Despite globalisation and cultural contact, cultures still differ in their ideas and expectations with respect to ageing and late life. This becomes particularly evident regarding old age provision. Whereas old age care preferences in western, individualistically oriented cultures rather highlight autonomy and staying independent as long as possible, collectivistic cultures traditionally rely on family care and co-residence. Cultural preferences are also expressed in different policies and extent of state provision for old-age. The question of how care decisions are taken becomes particularly prominent in light of societal transitions or migration when old care patterns might no longer hold. The present symposium focusses on cultural aspects of ageing and care from different parts of the world, drawing on both qualitative and quantitative methodologies. Starting with a general view on how people prepare for later life, the symposium deepens the focus on transitions to old age care in different cultural contexts and in light of migration. The first presentation draws on a large cross-cultural comparison between Germany, Hong Kong, and the US, and examines how personal timing of late-life preparation is associated with subjective residual life expectation. In the next contribution, we have then a closer look into cultural influences on older people’s transition into a nursing home, taking into account also family and context factors. This is followed by an in-depth look into decisional processes related to care home entry in a non-western cultural context. Afterwards, we address the context of migration, thereby comparing more independently oriented vs. family oriented cultural contexts and how the transition between the two might have an impact on preferences for different care arrangements. Finally, we focus on the emerging topic of specific needs of migrants in nursing homes, increasingly important in light of growing numbers of ageing first generation migrants. [less ▲]

Detailed reference viewed: 41 (1 UL)
See detailGrenzüberschreitende Berufsausbildung als grenzüberschreitender Lernprozess in der grenzregion Lothringen - Saarland
Funk, Ines; Nienaber, Birte UL; Dörrenbächer, Peter

Scientific Conference (2019, May 24)

Detailed reference viewed: 47 (3 UL)
Full Text
Peer Reviewed
See detailPierre Werner and Luxembourg: A vision for Europe
Danescu, Elena UL

Scientific Conference (2019, May 24)

Pierre Werner was one of the rare politicians to be associated with all the major milestones in the building of a united Europe, from the 1950 Schuman Plan to the Fontainebleau European Council in 1984 ... [more ▼]

Pierre Werner was one of the rare politicians to be associated with all the major milestones in the building of a united Europe, from the 1950 Schuman Plan to the Fontainebleau European Council in 1984. He placed the European integration process at the centre of Luxembourg domestic policy, convinced of the need to preserve national identity and sovereignty by adopting an international outlook. Determined to set the country on a forward-looking path, he pursued a pragmatic yet ambitious approach to economic diversification, focusing in particular on consolidating the international financial centre from the 1960s onwards, nurturing the idea for a national shipping flag, developing the audiovisual sector and launching the innovative satellite project [less ▲]

Detailed reference viewed: 15 (0 UL)
Peer Reviewed
See detailCare preferences in the context of migration: nursing home, mobile assistance or family?
Albert, Isabelle UL; Barros, Stephanie; Coimbra, Susana

Scientific Conference (2019, May 24)

Theoretical background: Cultures differ in how they arrange old age care and intergenerational co-residence patterns. Whereas Southern European countries rely more on family support, in Western/Northern ... [more ▼]

Theoretical background: Cultures differ in how they arrange old age care and intergenerational co-residence patterns. Whereas Southern European countries rely more on family support, in Western/Northern European countries state provision is higher with a clear preference for paid care work. 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. Objectives: The aims of our study were to examine 1) if different care preferences can be found between three subsamples - from independently-oriented vs. more family oriented contexts as well as migrants from one to the other, and 2) in how far differences can be explained by relationship indicators, value orientations and sociodemographic variables. Methods: Drawing on data from the FNR-funded IRMA study, we compared three subgroups of N = 359 adults between the ages of 46 and 80 - Luxembourgers and Portuguese as well as Portuguese immigrants living in Luxembourg. Results/Discussion: Controlling for socio-demographic variables, our results showed differences in care preferences as well as in how these could be explained by further variables. Most Luxembourgers preferred to be cared for at home with a mobile service; this preference was followed by institutional care and only few preferred to live with their adult children. In contrast, institutional care was rarely chosen as a preference by Portuguese living in Luxembourg and in Portugal where care provision from children was preferred more often. Whereas relationship quality, expectations of adult children and current support exchange were high for participants who preferred care by adult children in all three subsamples, differences were found with regard to family orientation which was more important for care preferences of participants living in Luxembourg than Portugal. Results are discussed in a theoretical framework of intergenerational relations in light of migration and ageing. [less ▲]

Detailed reference viewed: 41 (0 UL)
Peer Reviewed
See detailTransition into a Nursing Home: Theoretical Framework on the Influence of Cultural Factors
Boll, Thomas UL

Scientific Conference (2019, May 23)

OBJECTIVES: To create a theoretical framework for analyzing cultural influences on older people’s transition into a nursing home (NH). THEORIES: Action theories in cultural and developmental psychology ... [more ▼]

OBJECTIVES: To create a theoretical framework for analyzing cultural influences on older people’s transition into a nursing home (NH). THEORIES: Action theories in cultural and developmental psychology (Boesch, 2001; Brandtstädter, 2006), social representations theory (Marková, 2012), theory of culture as a semiotic regulation system (Valsiner, 2007). METHODS: (1) Conceptualization of NH care and family care as alternative action paths for meeting the needs of older persons and their relatives. (2) Conceptualization of culture as a product of human actions and as offering different possibilities of care-related actions. (3) Systematization of care-related goals and instrumental values of NH care versus family care. (4) Theoretical mapping of cultural factors on proximal determinants of elder care decisions and actions. RESULTS: The framework contains the following propositions. Older people and family caregivers hold multiple goals (e.g., welfare of family carers, welfare of old person). NH care can meet some goals and simultaneously frustrate others. The effects and choice of NH care depends on a variety of cultural factors: Legal regulations for warranting care quality (e.g., nursing home laws), economic concepts and practices (e.g., business models of elder care) and professionalization (e.g., staff training). Family care depends on institutionalized options for reconciling job-, care- and other family-related duties (e.g., mobile care services, day care units) and for compensating expenses (e.g., care insurance). Cultural concepts of care dependency influence the meanings that individuals attribute to NH care. CONCLUSIONS: The framework specifies cultural factors relevant for older peoples’ transition into a NH and delineates mediating paths. It invites other sciences specialized on relevant cultural factors (e.g., law, political science, social economics) to further refine the analysis. An identification of cultural factors affecting NH care opens new options for improving care quality or living conditions of older persons, family and professional carers. [less ▲]

Detailed reference viewed: 28 (3 UL)
Full Text
Peer Reviewed
See detailCompetence support in physical education: a predictor towards a more self-determined physical activity behavior?
Hutmacher, Djenna UL; Eckelt, Melanie UL; Bund, Andreas UL et al

Scientific Conference (2019, May 22)

Objectives: Given a widespread continuous decrease in children’s and adolescents’ physical activity (PA), the potential of physical education (PE) in promoting young people’s PA motivation and behavior ... [more ▼]

Objectives: Given a widespread continuous decrease in children’s and adolescents’ physical activity (PA), the potential of physical education (PE) in promoting young people’s PA motivation and behavior has become a key issue. Research in line with the trans-contextual model highlights the support of perceived autonomy in PE as a significant predictor for self-determined PA behavior in a leisure-time (LT) context (Hagger et al., 2003). However, the impact of competence and relatedness support still remains unclear. Therefore, the present study aimed to investigate the role of support during PE, differentiated into three basic needs for behavioral regulation in PE and LT. It was expected that, in addition to perceived autonomy, competence and relatedness would be relevant predictors. Method: 244 students (139 girls) from Luxembourg, ranging from 11 to 21 years, participated in the study. Via a digital questionnaire, the scales need support (perceived autonomy, competence and relatedness; Standage, Duda, & Ntoumanis, 2005), basic needs (BPNES; Vlachopoulos, Ntoumanis, & Smith, 2010), and external and intrinsic motivation in PE (PLOC-R; Vlachopoulos et al., 2011) as well as in LT (BREQ-II; Markland & Tobin, 2004) were applied in the classroom. With regard to the theory of planned behavior (Ajzen, 1985), the attitudes, perceived behavioral control, and intentions toward PA were assessed (Hagger et al., 2003). Results: A SEM analysis showed that competence support in PE was the major predictor for self-determined behavior in PE, while perceived autonomy produced mixed findings. Relatedness support had a negative effect on external regulated behavior in PE. In accordance with the assumptions of the trans-contextual model, similar behavioral regulations in PE and LT were found. Furthermore, a more self-determined behavior in LT predicted higher attitudes, subjective norms, and perceived behavioral control towards PA, which increased the intention of doing sports. Discussion: Results suggest that the children’s perceived support of competence from the teacher during PE is an important factor to increase self-determined PA behavior. Further intervention programs may focus on improving the perception of competence during PE in order to increase motivation. In addition, these findings underline the importance for future research to consider the different roles of perceived support of competence, autonomy and relatedness in PE. [less ▲]

Detailed reference viewed: 71 (2 UL)
See detailThe interplay of deliberative legitimacy, constituent power and constitutional form
Burks, Deven UL

Scientific Conference (2019, May 21)

Enhanced legitimacy is a driving force behind deliberative innovations (Fung 2015, Curato and Böker 2016). This is no less the case for constitutional deliberative innovations. Assessing deliberative ... [more ▼]

Enhanced legitimacy is a driving force behind deliberative innovations (Fung 2015, Curato and Böker 2016). This is no less the case for constitutional deliberative innovations. Assessing deliberative constitutionalism’s success in generating legitimacy necessitates a better grasp of the distinct legitimacy standards which constitutional deliberative innovations may meet. Bound up with those standards is deliberative constitutionalism’s attempt to navigate the tension between politics and law, constituent power (CP) and constituted form (CF). How do factors of deliberative legitimacy interact with standard ways of modelling that tension? To answer this question, I proceed in three parts, the first of which maps ten factors of deliberative legitimacy at four levels: personal, interpersonal, institutional, and systemic. The second lays out four ways of modelling the tension between CP and CF from Loughlin and Walker (2007): the containment, mutual articulation, radical potential, and irritant models. The last part sets out to determine whether the four models directly or indirectly support or neglect the realization of the forms of deliberative legitimacy and casts in a different light from Parkinson (2016) the landscape of deliberative democracy and constitutions. I conclude that certain forms of deliberative legitimacy may be more sensitive to and better served by some models of CP and CF than by others. [less ▲]

Detailed reference viewed: 62 (0 UL)
Full Text
Peer Reviewed
See detailUltrareliable SWIPT using Unscheduled Short Packet Transmissions
Kisseleff, Steven UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in IEEE International Conference on Communications (ICC), B5G-URLLC Workshop, Shanghai, May 2019 (2019, May 20)

Large communication networks, e.g. Internet of Things (IoT), are known to be vulnerable to the co-channel interference from simultaneous transmissions. In the recent time, this problem has been ... [more ▼]

Large communication networks, e.g. Internet of Things (IoT), are known to be vulnerable to the co-channel interference from simultaneous transmissions. In the recent time, this problem has been extensively studied in various contexts. Due to a potentially very long duty cycle, orthogonal multiple access techniques are not well suited for such schemes. Instead, random medium access (RMA) seems promising, since it guarantees a lower bound for the network throughput even in presence of an infinite number of simultaneous transmissions while reducing the average length of the duty cycle. Such an RMA scheme is based on transmission of short data packets with unknown scheduling. Of course, a reliable symbol detection for this type of communication is very challenging not only due to a large amount of interference from the adjacent nodes, but also because of the uncertainty related to the presence or absence of overlapping packets. Interestingly, with increasing number of network nodes also the amount of energy, which can be harvested from the received signal, increases. This is especially beneficial for powering of a relay device, which may utilize the energy for further information processing and retransmission. In this paper, we address the design of a simultaneous information and power transfer scheme based on unscheduled short packet transmissions for ultrareliable communication. [less ▲]

Detailed reference viewed: 46 (4 UL)
Full Text
Peer Reviewed
See detailA GP Hyper-Heuristic Approach for Generating TSP Heuristics
Duflo, Gabriel UL; Kieffer, Emmanuel UL; Brust, Matthias R. UL et al

in 33rd IEEE International Parallel & Distributed Processing Symposium (IPDPS 2019) (2019, May 20)

Detailed reference viewed: 187 (50 UL)
Full Text
Peer Reviewed
See detailMint Centrality: A Centrality Measure for the Bitcoin Transaction Graph
Fiz Pontiveros, Beltran UL; Steichen, Mathis UL; State, Radu UL

Poster (2019, May 17)

In this work, we consider the graph of confirmed transactions in Bitcoin. Understanding this graph is essential to discern the different economic activities conducted by the pseudonymous actors. In ... [more ▼]

In this work, we consider the graph of confirmed transactions in Bitcoin. Understanding this graph is essential to discern the different economic activities conducted by the pseudonymous actors. In addition to traditional graph analysis methods, new metrics need to be engineered specifically for the bitcoin transaction graph. Hence, we propose a new centrality measure named mint centrality. The measure uses the inherent tree structure of transactions in bitcoin and their relation to the corresponding set of coinbase transactions, and can be evaluated with linear complexity. We evaluate the mint centrality on the first 200,000 blocks of the public bitcoin blockchain. [less ▲]

Detailed reference viewed: 115 (0 UL)
Peer Reviewed
See detailPreschool teachers’ language-supporting strategies in multilingual education in Luxembourg
Kirsch, Claudine UL

Scientific Conference (2019, May 16)

Detailed reference viewed: 59 (1 UL)
See detailThe social stratification of higher education trajectories: A sequence-analytical approach
Haas, Christina UL

Scientific Conference (2019, May 16)

Detailed reference viewed: 24 (1 UL)
Peer Reviewed
See detailThe Effect of Professional Development on Multilingual Education in Early Childhood in Luxembourg.
Kirsch, Claudine UL; Aleksic, Gabrijela; Andersen, Katja Natalie UL et al

Scientific Conference (2019, May 15)

In sum, these findings show that the PD made the practitioners reflect on their language use, which, in turn, contributed to a positive stance towards multilingualism (Egert et al., 2018; Garrity et al ... [more ▼]

In sum, these findings show that the PD made the practitioners reflect on their language use, which, in turn, contributed to a positive stance towards multilingualism (Egert et al., 2018; Garrity et al., 2015; Peeters, Cameron, Lazzari, et al., 2014). The partly contradictory findings – embracing translanguaging while holding on to language separation - are reminiscent of other studies showing that practitioners do not simply substitute one set of beliefs with a different one but can hold contradictory beliefs (Levin and Wadmany, 2006). Reflecting on the professional development carried out in New York, Seltzer (2018) reported that the participating teachers simultaneously evidenced ideological shifts and deficit thinking, such as defining children’s linguistic skills as baby talk. [less ▲]

Detailed reference viewed: 105 (7 UL)
Full Text
Peer Reviewed
See detailDemo: Blockchain for the Simplification and Automation of KYC Result Sharing
Norvill, Robert UL; Steichen, Mathis UL; Shbair, Wazen UL et al

in IEEE International Conference on Blockchain and Cryptocurrency (ICBC 2019) (2019, May 14)

Know Your Customer (KYC) processes performed by banks on their customers are redundant, cumbersome and costly. Therefore, a system is proposed to automate menial tasks and allow sharing of data related to ... [more ▼]

Know Your Customer (KYC) processes performed by banks on their customers are redundant, cumbersome and costly. Therefore, a system is proposed to automate menial tasks and allow sharing of data related to KYC. A blockchain dictates the collaboration between different participants and several services are built around it to support the functionality of the system as a whole. An access control system is used to share data legitimately. [less ▲]

Detailed reference viewed: 136 (14 UL)
Full Text
Peer Reviewed
See detailBlockZoom: Large-Scale Blockchain Testbed
Shbair, Wazen UL; Steichen, Mathis UL; Francois, Jerome et al

in IEEE International Conference on Blockchain and Cryptocurrency (ICBC 2019) (2019, May 14)

Future blockchain applications are anticipated to serve millions of users. Thus the evaluation of new blockchain applications have to consider large-scale assessment of the technologies behind the scene ... [more ▼]

Future blockchain applications are anticipated to serve millions of users. Thus the evaluation of new blockchain applications have to consider large-scale assessment of the technologies behind the scene. Most of current testing approaches have been done either on simulators or via local small blockchain networks. Hence, the performance in real world conditions is unpredictable. This demonstration introduces BlockZoom, a large-scale blockchain testbed that runs on top of a highly reconfigurable and controllable HPC platform. BlockZoom presents a reproducible environment for experimenting distributed ledgers technologies and smart contract applications. Through different configuration scenarios developers can evaluate the applications performance and the blockchain behavior at a scale comparable to the production environment. The target audience of this demonstration includes researchers and developers in blockchain technology. [less ▲]

Detailed reference viewed: 113 (8 UL)
Full Text
Peer Reviewed
See detailMultiscale fracture: a natural connection between reduced order models and homogenisation
Bordas, Stéphane UL; Beex, Lars UL; Chen, Li UL et al

Scientific Conference (2019, May 13)

Detailed reference viewed: 102 (9 UL)
Full Text
Peer Reviewed
See detailDisplacement based polytopal elements a strain smoothing and scaled boundary approach
Bordas, Stéphane UL; Natarajan, Sundararajan

Scientific Conference (2019, May 03)

Detailed reference viewed: 149 (9 UL)
See detailCanonical quantization for compact quantizable Kaehler manifolds
Schlichenmaier, Martin UL

Scientific Conference (2019, May 02)

Detailed reference viewed: 53 (1 UL)
Full Text
Peer Reviewed
See detailMCP: A Security Testing Tool Driven by Requirements
Mai, Xuan Phu UL; Pastore, Fabrizio UL; Goknil, Arda et al

in 2019 IEEE/ACM 41st International Conference on Software Engineering (2019, May)

We present MCP, a tool for automatically generating executable security test cases from misuse case specifications in natural language (i.e., use case specifications capturing the behavior of malicious ... [more ▼]

We present MCP, a tool for automatically generating executable security test cases from misuse case specifications in natural language (i.e., use case specifications capturing the behavior of malicious users). MCP relies on Natural Language Processing (NLP), a restricted form of misuse case specifications, and a test driver API implementing basic utility functions for security testing. NLP is used to identify the activities performed by the malicious user and the control flow of misuse case specifications. MCP matches the malicious user’s activities to the methods of the provided test driver API in order to generate executable security test cases that perform the activities described in the misuse case specifications. MCP has been successfully evaluated on an industrial case study. [less ▲]

Detailed reference viewed: 166 (28 UL)
Full Text
Peer Reviewed
See detailConvex Combination of Constraint Vectors for Set-membership Affine Projection Algorithms
Nagashima Ferreira, Tadeu; Alves Martins, Wallace UL; Lima, Markus et al

in Proc. of IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) (2019, May)

Set-membership affine projection (SM-AP) adaptive filters have been increasingly employed in the context of online data-selective learning. A key aspect for their good performance in terms of both ... [more ▼]

Set-membership affine projection (SM-AP) adaptive filters have been increasingly employed in the context of online data-selective learning. A key aspect for their good performance in terms of both convergence speed and steady-state mean-squared error is the choice of the so-called constraint vector. Optimal constraint vectors were recently proposed relying on convex optimization tools, which might some- times lead to prohibitive computational burden. This paper proposes a convex combination of simpler constraint vectors whose performance approaches the optimal solution closely, utilizing much fewer computations. Some illustrative examples confirm that the sub-optimal solution follows the accomplishments of the optimal one. [less ▲]

Detailed reference viewed: 63 (10 UL)
Full Text
Peer Reviewed
See detailParallel coordinate descent algorithms for sparse phase retrieval
Yang, Yang UL; Pesavento, Marius; Eldar, Yonina C. et al

in Proc. 2019 IEEE International Conference on Acoustics, Speech and Signal (ICASSP) (2019, May)

Detailed reference viewed: 212 (23 UL)
Full Text
Peer Reviewed
See detailLearning to Spot and Refactor Inconsistent Method Names
Liu, Kui UL; Kim, Dongsun; Bissyande, Tegawendé François D Assise UL et al

in 41st ACM/IEEE International Conference on Software Engineering (ICSE) (2019, May)

To ensure code readability and facilitate software maintenance, program methods must be named properly. In particular, method names must be consistent with the corresponding method implementations ... [more ▼]

To ensure code readability and facilitate software maintenance, program methods must be named properly. In particular, method names must be consistent with the corresponding method implementations. Debugging method names remains an important topic in the literature, where various approaches analyze commonalities among method names in a large dataset to detect inconsistent method names and suggest better ones. We note that the state-of-the-art does not analyze the implemented code itself to assess consistency. We thus propose a novel automated approach to debugging method names based on the analysis of consistency between method names and method code. The approach leverages deep feature representation techniques adapted to the nature of each artifact. Experimental results on over 2.1 million Java methods show that we can achieve up to 15 percentage points improvement over the state-of-the-art, establishing a record performance of 67.9% F1-measure in identifying inconsistent method names. We further demonstrate that our approach yields up to 25% accuracy in suggesting full names, while the state-of-the-art lags far behind at 1.1% accuracy. Finally, we report on our success in fixing 66 inconsistent method names in a live study on projects in the wild. [less ▲]

Detailed reference viewed: 269 (20 UL)
Full Text
Peer Reviewed
See detailVIEW-INVARIANT ACTION RECOGNITION FROM RGB DATA VIA 3D POSE ESTIMATION
Baptista, Renato UL; Ghorbel, Enjie UL; Papadopoulos, Konstantinos UL et al

in IEEE International Conference on Acoustics, Speech and Signal Processing, Brighton, UK, 12–17 May 2019 (2019, May)

In this paper, we propose a novel view-invariant action recognition method using a single monocular RGB camera. View-invariance remains a very challenging topic in 2D action recognition due to the lack of ... [more ▼]

In this paper, we propose a novel view-invariant action recognition method using a single monocular RGB camera. View-invariance remains a very challenging topic in 2D action recognition due to the lack of 3D information in RGB images. Most successful approaches make use of the concept of knowledge transfer by projecting 3D synthetic data to multiple viewpoints. Instead of relying on knowledge transfer, we propose to augment the RGB data by a third dimension by means of 3D skeleton estimation from 2D images using a CNN-based pose estimator. In order to ensure view-invariance, a pre-processing for alignment is applied followed by data expansion as a way for denoising. Finally, a Long-Short Term Memory (LSTM) architecture is used to model the temporal dependency between skeletons. The proposed network is trained to directly recognize actions from aligned 3D skeletons. The experiments performed on the challenging Northwestern-UCLA dataset show the superiority of our approach as compared to state-of-the-art ones. [less ▲]

Detailed reference viewed: 209 (31 UL)
Full Text
Peer Reviewed
See detailTowards sampling and simulation-based analysis of featured weighted automata
Cordy, Maxime UL; Legay, Axel; Lazreg, Sami et al

in Proceedings of the 7th International Workshop on Formal Methods in Software Engineering (2019, May)

Detailed reference viewed: 16 (0 UL)
Full Text
Peer Reviewed
See detailMultifaceted automated analyses for variability-intensive embedded systems
Lazreg, Sami; Cordy, Maxime UL; Collet, Philippe et al

in Proceedings of the 41st International Conference on Software Engineering, ICSE 2019, Montreal, QC, Canada, May 25-31, 2019 (2019, May)

Detailed reference viewed: 22 (0 UL)
Full Text
Peer Reviewed
See detailSymposium: Early detection and prevention of cognitive decline and dementia: Findings from major European collaborative and research initiatives
Leist, Anja UL

Scientific Conference (2019, May)

With still no medical cure for dementia available, major research initiatives have been set up to investigate and target the development of dementia at earlier stages. Several ongoing projects focus on ... [more ▼]

With still no medical cure for dementia available, major research initiatives have been set up to investigate and target the development of dementia at earlier stages. Several ongoing projects focus on early detection of dementia with the hope to be able to administer personalized interventions for individuals at high risk. Ongoing clinical trials test different interventions on their potential to prevent or delay the onset of dementia. Complementing those efforts, large and long-spanning observational studies can be used to detect long-term precursors of cognitive aging. Indeed, there is increasing evidence for a large window of opportunity for intervention of several decades that could be used for preventative efforts in dementia. The symposium will bring together major European collaborative and research initiatives in the field of early detection and prevention of dementia. The first part of the symposium will present findings from clinical trials, the second part new findings coming from a range of observational studies. The first paper will report on the design and study cohorts of the European Prevention of Alzheimer’s Dementia Consortium (EPAD) and the TriBEKa project. The second paper will focus on new multifactorial models to quantify prevention potential based on the FINGER trial. The third paper will report an integrated analysis of four longitudinal studies of ageing (OCT0, H70, LASA, and MAP) to evaluate the role of cognitively stimulating activities in the transitions from cognitively normal to slightly impaired, severely impaired, and death with multi-state models. The fourth paper will present the contribution of environmental factors over the life course, in particular air pollution, on cognitive change in the Lothian Birth Cohort of 1936. The last paper makes use of recent developments in approaching causal inference in observational studies and applies these to predict cognitive aging and dementia with data from the Survey of Health, Ageing and Retirement in Europe. [less ▲]

Detailed reference viewed: 38 (4 UL)
Full Text
Peer Reviewed
See detailPredicting Sparse Clients' Actions with CPOPT-Net in the Banking Environment
Charlier, Jérémy Henri J. UL; State, Radu UL; Hilger, Jean UL

in 32nd Canadian Conference on Artificial Intelligence Proceedings (2019, May)

The digital revolution of the banking system with evolving European regulations have pushed the major banking actors to innovate by a newly use of their clients' digital information. Given highly sparse ... [more ▼]

The digital revolution of the banking system with evolving European regulations have pushed the major banking actors to innovate by a newly use of their clients' digital information. Given highly sparse client activities, we propose CPOPT-Net, an algorithm that combines the CP canonical tensor decomposition, a multidimensional matrix decomposition that factorizes a tensor as the sum of rank-one tensors, and neural networks. CPOPT-Net removes efficiently sparse information with a gradient-based resolution while relying on neural networks for time series predictions. Our experiments show that CPOPT-Net is capable to perform accurate predictions of the clients' actions in the context of personalized recommendation. CPOPT-Net is the first algorithm to use non-linear conjugate gradient tensor resolution with neural networks to propose predictions of financial activities on a public data set. [less ▲]

Detailed reference viewed: 74 (0 UL)
Full Text
Peer Reviewed
See detailRise of the machines - Moral decisions in Detroit: Become Human
Holl, Elisabeth UL

Scientific Conference (2019, May)

Moral decisions in video games have become increasingly popular. This work in progress project applies established theories on mediated morality (e.g., MIME; Tamborini, 2011) to the cutting-edge video ... [more ▼]

Moral decisions in video games have become increasingly popular. This work in progress project applies established theories on mediated morality (e.g., MIME; Tamborini, 2011) to the cutting-edge video game Detroit: Become Human. The in the game implemented feature of displaying world statistics provides valuable information on how players engage in meaningful moral decision within a virtual world. Statistics will be aggregated and analyzed in relation to the available decision time span, the involved characters and different moral foundations. [less ▲]

Detailed reference viewed: 708 (8 UL)
Peer Reviewed
See detailAre dates processed like words rather than like numbers? A study of transposition priming effects
Lochy, Aliette UL; Golinvaux, Fanny; Schiltz, Christine UL

Poster (2019, May)

Neuropsychological case-studies suggested that dates and encyclopedic numbers may be processed differently than unknown numbers. However, this issue was not yet investigated in reading in healthy ... [more ▼]

Neuropsychological case-studies suggested that dates and encyclopedic numbers may be processed differently than unknown numbers. However, this issue was not yet investigated in reading in healthy participants, so that it is unclear if dates are read like words and processed as lexical items, or like numbers where each position strictly defines the digit value in a base-10 system. Here, we compared processing of known dates to unknown numbers in a group of 26 experts (students and teachers in History). Participants performed an explicit recognition task on dates (e.g., 1789, 1945, …) and on acronyms (e.g., FNRS, HDMI, …), half known and half unknown. They were preceded by an identical prime (e.g., 1945-1945), a transposed-character prime (e.g., 1495-1945) or a substituted-character prime (e.g., 1635-1945). Results show that for dates, there is a significant transposition gain (-57ms), while for unknown numbers as well as for acronyms (known and unknown), the transposed-character prime induced a cost (from +17 to +257ms) rather than a gain. The facilitation due to transposed characters found here on dates is similar to what is observed in studies of lexical decision on words. Therefore, it suggests that dates may be processed with similar types of orthographical mechanisms than words. [less ▲]

Detailed reference viewed: 37 (3 UL)
Full Text
Peer Reviewed
See detailNon-Intrusive Cognitive Measurement for the Amplitude Response of Wideband Transponders
Mazalli, N.; Andrenacci, Stefano UL; Chatzinotas, Symeon UL

in International Conference on Communications (2019, May)

In this paper we propose a new measurement procedure for the amplitude response of a wideband transponder in an in-orbit testing (IOT) context. The proposed procedure resorts to a direct sequence spread ... [more ▼]

In this paper we propose a new measurement procedure for the amplitude response of a wideband transponder in an in-orbit testing (IOT) context. The proposed procedure resorts to a direct sequence spread spectrum (DSSS) technique in order to limit the interference caused by the measurement signals to the traffic. Further, an adaptive approach exploiting the knowledge of the inband traffic power has been introduced. Such knowledge, acquired either a priori or by sensing the channel, allows to easily design measurement signals satisfying multiple performance requirements (i.e., accuracy, resolution, interference, duration, and complexity). The proposed procedure can be used as a design tool to optimize the dimensioning of the IOT system parameters, and to flexibly trade off a performance indicator against another. [less ▲]

Detailed reference viewed: 19 (13 UL)
Full Text
Peer Reviewed
See detailOutage Performance of Integrated Satellite-Terrestrial Relay Networks with Opportunistic Scheduling
Huang, Qingquan; Zhu, Wei-Ping; Chatzinotas, Symeon UL et al

in ICC 2019 - 2019 IEEE International Conference on Communications (ICC) (2019, May)

In this paper, we investigate the outage performance of a multiuser threshold-based decode-and-forward integrated satellite-terrestrial relay network (ISTRN) with opportunistic user scheduling, where the ... [more ▼]

In this paper, we investigate the outage performance of a multiuser threshold-based decode-and-forward integrated satellite-terrestrial relay network (ISTRN) with opportunistic user scheduling, where the satellite link and terrestrial links undergo Shadowed-Rician (SR) fading and correlated Rayleigh fading, respectively. First, we propose a new probability density function (PDF) to statistically characterize the square sum of independent and identically distributed SR random variables, which is more accurate and concise than existing expressions. Next, based on the new PDF, we derive an analytical expression of outage probability (OP) of the considered network. Furthermore, the asymptotic OP expression is developed at high signal-to-noise ratio to reveal the achievable diversity order of the considered ISTRN. Finally, computer simulation is conducted to validate the analytical results, and show the impact of various parameters on the outage performance. [less ▲]

Detailed reference viewed: 12 (0 UL)
Full Text
Peer Reviewed
See detailWho’s afraid of Donkey Kong? Testing the Stereotype Threat Effect in Video Gaming
Holl, Elisabeth UL; Wagener, Gary L.; Melzer, André UL

Scientific Conference (2019, May)

In two studies (Study 1: N = 130; Study 2: N = 56) participants played a video game (Bejeweled 3; SkyChasers) and were either confronted with a stereotype threat (ST) or not. ST is defined as the risk of ... [more ▼]

In two studies (Study 1: N = 130; Study 2: N = 56) participants played a video game (Bejeweled 3; SkyChasers) and were either confronted with a stereotype threat (ST) or not. ST is defined as the risk of confirming a negative stereotype about one’s own group and has been investigated in various field, i.a. in gaming. In the first study participants were confronted with the stereotype that women would perform worse in video games than men. In the second study we worked with a reversed stereotype, namely that women would have now outpaced males in some genres of video games. Our results show that performance varies across gender and genre. Although we did not find the hypothesized interaction effect of gender and ST condition in performance, self-reported measures, such as perceived frustration, and moderating variables indicate performance differences both for women and men, but on different psychological dimensions. [less ▲]

Detailed reference viewed: 164 (13 UL)
Peer Reviewed
See detailInnovative work behaviors of entrepreneurs: The role of resilience and satisfaction with life
Palmer, Carolin; Jaouen, Annabelle; Gundolf, Katherine et al

Scientific Conference (2019, May)

We examine the antecedents of entrepreneurs’ innovative work behavior through the prism of two personality variables: resilience and satisfaction with life. Based on a sample of 325 French entrepreneurs ... [more ▼]

We examine the antecedents of entrepreneurs’ innovative work behavior through the prism of two personality variables: resilience and satisfaction with life. Based on a sample of 325 French entrepreneurs, we find a direct effect of both variables. [less ▲]

Detailed reference viewed: 56 (0 UL)
Full Text
Peer Reviewed
See detailTowards Systematic Specification of Non-Functional Requirements for Sharing Economy Services
Symeonidis, Iraklis UL; Schroers, Jessica; Mustafa A. Mustafa, Mustafa A. et al

in Towards Systematic Specification of Non-Functional Requirements for Sharing Economy Services (2019, May)

Sharing Economy (SE) systems use technologies to enable sharing of physical assets and services among individuals. This allows optimisation of resources, thus contributing to the re-use principle of ... [more ▼]

Sharing Economy (SE) systems use technologies to enable sharing of physical assets and services among individuals. This allows optimisation of resources, thus contributing to the re-use principle of Circular Economy. In this paper, we assess existing SE services and identify their challenges in areas that are not technically connected to their core functionality but are essential in creating trust: information security and privacy, personal data protection and fair economic incentives. Existing frameworks for elicitation of non-functional requirements are heterogeneous in their focus and domain specific. Hence, we propose to develop a holistic methodology for non-functional requirements specification for SE systems following a top-down-top approach. A holistic methodology considering non-functional requirements is essential and can assist in the analysis and design of SE systems in a systematic and unified way applied from the early stages of the system development. [less ▲]

Detailed reference viewed: 87 (4 UL)
Full Text
Peer Reviewed
See detailROS-Defender: SDN-based Security Policy Enforcement for Robotic Applications
Rivera, Sean UL; Lagraa, Sofiane UL; State, Radu UL et al

in IEEE Workshop on the Internet of Safe Things, Co-located with IEEE Security and Privacy 2019 (2019, May)

Abstract—In this paper we propose ROS-Defender, a holistic approach to secure robotics systems, which integrates a Security Event Management System (SIEM), an intrusion prevention system (IPS) and a ... [more ▼]

Abstract—In this paper we propose ROS-Defender, a holistic approach to secure robotics systems, which integrates a Security Event Management System (SIEM), an intrusion prevention system (IPS) and a firewall for a robotic system. ROS-Defender combines anomaly detection systems at application (ROS) level and network level, with dynamic policy enforcement points using software defined networking (SDN) to provide protection against a large class of attacks. Although SIEMs, IPS, and firewall have been previously used to secure computer networks, ROSDefender is applying them for the specific use case of robotic systems, where security is in many cases an afterthought. [less ▲]

Detailed reference viewed: 78 (6 UL)
Full Text
Peer Reviewed
See detailMulticultural society - multiple ways to negotiate identity
Murdock, Elke UL

Scientific Conference (2019, April 30)

The 21st century has been called the “age of migration” (Castles & Miller, 2009). International migration is a growing phenomenon, both in terms of scope and complexity and affects virtually all countries ... [more ▼]

The 21st century has been called the “age of migration” (Castles & Miller, 2009). International migration is a growing phenomenon, both in terms of scope and complexity and affects virtually all countries in the world (United Nations, 2009). The global migration system has changed over recent decades with regard to origins and destinations for migration. In the 20th century, Europe was a major area for emigration, but has now become a target for immigration, with most European countries, including Iceland, hosting significant minority immigrant populations. In Luxembourg, nearly half of the population is foreign – the foreign population percentage currently stands at 48%. Within this context majority and minority become fluid with the migration process itself being fluid, ranging from daily migration (transnational commuters), to medium-term stays, return visits and permanent immigration including uptake of citizenship. Within such a plurally composed society, culture contact is a permanent feature in daily life. Nationality becomes a salient feature as culture contact tends to prompt reflection, resulting in questioning and (re-)negotiation of national identity. This affects both the native and the diverse immigrant population – with diversity going beyond the level of country of origin as many individuals have very complex biographies. Using multicultural, multilingual Luxembourg as a case study example, I will present examples for the construal process of national identity for different groups, illustrating how (national) identity is negotiated at individual level. As can be expected, the identity construal process becomes more complex within a multicultural context. [less ▲]

Detailed reference viewed: 80 (8 UL)
Full Text
Peer Reviewed
See detailEmotion Regulation Difficulties in Adolescents with ADHD and/or Dyslexia
Battistutta, Layla UL; Steffgen, Georges UL

Poster (2019, April 26)

Objectives: ADHD is commonly associated with emotion regulation (ER) problems. Although around 10-45% of adolescents with ADHD also present with specific learning disorders such as dyslexia, studies on ER ... [more ▼]

Objectives: ADHD is commonly associated with emotion regulation (ER) problems. Although around 10-45% of adolescents with ADHD also present with specific learning disorders such as dyslexia, studies on ER in dyslexia or comorbid cases of ADHD/dyslexia remain limited. The aim was to examine potential differences in ER abilities between 11 to 16-year-old adolescents diagnosed with ADHD, dyslexia as well as comorbid dyslexia/ADHD. Method: Preliminary data from an ongoing research project was analyzed for 3 diagnostic groups (AD(H)D: n=15; dyslexia: n=12; dyslexia/AD(H)D: n=9) paired on age (F<1, n.s.), gender (X2(2)=0.68, p=.71) and IQ (F<1, n.s.). ER was investigated experimentally using a frustration inducing task (Behavioral Indicator of Resiliency to Distress; BIRD; Lejuez et al., 2006) while assessing adolescents’ subjective positive and negative affect before and after the task (PANAS-C; Laurent et al., 1999). Additionally, adolescents completed questionnaires on alexithymia (AQC, Rieffe, Oosterveld & Terwogt, 2006) and difficulties in ER (DERS-SF; Kaufman et al., 2016). Results: Preliminary findings showed a significant effect of time (F(1,33)=6.46, p=.02, n2=.16) with higher negative affect reported after the task and a marginal diagnostic group effect (F(2,33)=3.05, p=.06, n2=.16) showing marginally higher negative affect for the comorbid group compared to the dyslexia group (p=.06). Marginally significant group differences (F(2, 33)=3.21, p=.05, n2=.16) also showed higher alexithymia scores for the comorbid group compared to the dyslexia group (p=.06) but alexithymia and post-task negative affect were not found to be correlated (r=.25, p=.13). No differences in self-reported ER difficulties were found (F(2,33)=2.52, p=.10, n2=.13) between the three diagnostic groups. Conclusion: These preliminary findings indicate that, compared to a single diagnosis of dyslexia, a dyslexia/ADHD comorbidity might potentially entail less developed ER skills. The ongoing data collection (bigger sample, control group) will help to further elucidate these tentative results in the future. [less ▲]

Detailed reference viewed: 93 (3 UL)
Full Text
Peer Reviewed
See detailDeep Reinforcement Learning based Continuous Control for Multicopter Systems
Manukyan, Anush UL; Olivares Mendez, Miguel Angel UL; Geist, Matthieu et al

in International Conference on Control, Decision and Information CoDIT, Paris 23-26 April 2019 (2019, April 26)

In this paper we apply deep reinforcement learning techniques on a multicopter for learning a stable hovering task in a continuous action state environment. We present a framework based on OpenAI GYM ... [more ▼]

In this paper we apply deep reinforcement learning techniques on a multicopter for learning a stable hovering task in a continuous action state environment. We present a framework based on OpenAI GYM, Gazebo and RotorS MAV simulator, utilized for successfully training different agents to perform various tasks. The deep reinforcement learning method used for the training is model-free, on-policy, actor-critic based algorithm called Trust Region Policy Optimization (TRPO). Two neural networks have been used as a nonlinear function approximators. Our experiments showed that such learning approach achieves successful results, and facilitates the process of controller design. [less ▲]

Detailed reference viewed: 31 (2 UL)
Peer Reviewed
See detailChair and Commentator: European Union: Immigration and Border Control
Venken, Machteld UL

Scientific Conference (2019, April 25)

Detailed reference viewed: 1 (1 UL)
Full Text
Peer Reviewed
See detailEnseignants non spécialisés et (trans)disciplinarité. L’exemple de l’enseignement musical
Sagrillo, Damien UL

in Karsenti, T.; Goyer, S. (Eds.) Programme du colloque international en éducation et du Somme du numérique en éducation, 25 et 26 avril 2019. Montréal, QC: Centre de recherche interuniversitaire sur la formation et la profession enseignante, Chaire de recherche du Canada sur les technologies de l’information et de la communication (TIC) en éducation. (2019, April 25)

L’effet bénéfique qu’apportent la musique et l’enseignement musical à l’enseignement général, mais aussi à l’individu a été le sujet d’un certain nombre d’études (d’ailleurs controversées), comme ... [more ▼]

L’effet bénéfique qu’apportent la musique et l’enseignement musical à l’enseignement général, mais aussi à l’individu a été le sujet d’un certain nombre d’études (d’ailleurs controversées), comme l’observation à long terme dans des écoles fondamentales à Berlin. H. G. Bastian et son équipe (2002) ont démontré l’effet social bénéfique d’un enseignement musical approfondi. D’autres recherches ont dévoilé un manque de confiance tenace à l’égard de l’enseignement musical chez les étudiants et les enseignants (Holden et Button, 2006). D’autres encore ont analysé les potentialités d’un enseignement musical extrascolaire (Kivi, 2018). L’angoisse des formateurs non spécialisés devant l’éducation musicale se reflète souvent dans les arguments clichés comme : « Je n’ai pas fait du solfège; je ne suis pas musical; je ne peux pas chanter ». Le manque de connaissances déclaratives empêche donc le développement des savoir-faire. Nous présenterons des concepts développés relativement à deux traditions musicales (allemande et française) au Grand-Duché de Luxembourg. Notre objectif est de mettre à la disposition des futurs enseignants un éventail didactique. [less ▲]

Detailed reference viewed: 64 (2 UL)
Full Text
Peer Reviewed
See detailYou Cannot Fix What You Cannot Find! An Investigation of Fault Localization Bias in Benchmarking Automated Program Repair Systems
Liu, Kui UL; Koyuncu, Anil UL; Bissyande, Tegawendé François D Assise UL et al

in The 12th IEEE International Conference on Software Testing, Verification and Validation (ICST-2019) (2019, April 24)

Properly benchmarking Automated Program Repair (APR) systems should contribute to the development and adoption of the research outputs by practitioners. To that end, the research community must ensure ... [more ▼]

Properly benchmarking Automated Program Repair (APR) systems should contribute to the development and adoption of the research outputs by practitioners. To that end, the research community must ensure that it reaches significant milestones by reliably comparing state-of-the-art tools for a better understanding of their strengths and weaknesses. In this work, we identify and investigate a practical bias caused by the fault localization (FL) step in a repair pipeline. We propose to highlight the different fault localization configurations used in the literature, and their impact on APR systems when applied to the Defects4J benchmark. Then, we explore the performance variations that can be achieved by "tweaking'' the FL step. Eventually, we expect to create a new momentum for (1) full disclosure of APR experimental procedures with respect to FL, (2) realistic expectations of repairing bugs in Defects4J, as well as (3) reliable performance comparison among the state-of-the-art APR systems, and against the baseline performance results of our thoroughly assessed kPAR repair tool. Our main findings include: (a) only a subset of Defects4J bugs can be currently localized by commonly-used FL techniques; (b) current practice of comparing state-of-the-art APR systems (i.e., counting the number of fixed bugs) is potentially misleading due to the bias of FL configurations; and (c) APR authors do not properly qualify their performance achievement with respect to the different tuning parameters implemented in APR systems. [less ▲]

Detailed reference viewed: 180 (18 UL)
Peer Reviewed
See detailMixed Integer Linear Programming Model for the Optimal Operation of a Dual Source Heat Pump
Rafii-Tabrizi, Sasan UL; Hadji-Minaglou, Jean-Régis UL; Scholzen, Frank UL

Scientific Conference (2019, April 24)

This paper presents a mixed integer linear programming (MILP) model to optimally operate a dual source heat pump (DSHP). The DSHP draws environmental energy from an underground ice storage tank (IST) or ... [more ▼]

This paper presents a mixed integer linear programming (MILP) model to optimally operate a dual source heat pump (DSHP). The DSHP draws environmental energy from an underground ice storage tank (IST) or wind infrared sensitive collectors (WISC). WISC is further used to regenerate the IST. The thermal output of the DSHP is stored in a thermal energy storage (TES). A single-objective optimization approach is applied to minimize the operational cost of the DSHP over a scheduling horizon of 24h. The developed framework is tested on various days, which are representative for each season of the year. Furthermore, it is investigated how variable electricity price market data influence the dynamic behaviour of the DSHP. [less ▲]

Detailed reference viewed: 19 (3 UL)
Full Text
Peer Reviewed
See detailClosed Form Discrete Unimodular MIMO Waveform Design Using Block Circulant Decomposition
Hammes, Christian UL; Shankar, Bhavani UL; Ottersten, Björn UL

Poster (2019, April 22)

This paper deals with the waveform design under the constraint of discrete multiphase unimodular sequences. It relies on Block Circulant decomposition of the slow-time transmitted waveform. The presented ... [more ▼]

This paper deals with the waveform design under the constraint of discrete multiphase unimodular sequences. It relies on Block Circulant decomposition of the slow-time transmitted waveform. The presented closed-form solution is capable of designing orthogonal signals, such that the virtual MIMO paradigm is enabled leading to enhanced angular resolution. On the other hand, the proposed method is also capable of approximating any desired radiation pattern within the physical limits of the transmitted array size. Simulation results prove the effectiveness in terms computational complexity, orthogonal signal design and the transmit beam pattern design under constant modulus constraint. [less ▲]

Detailed reference viewed: 30 (2 UL)
Full Text
Peer Reviewed
See detailIoT Device Fingerprinting: Machine Learning based Encrypted Traffic Analysis
Msadek, Mohamed Nizar UL; Soua, Ridha UL; Engel, Thomas UL

in The IEEE Wireless Communications and Networking Conference (WCNC) (2019, April 19)

Even in the face of strong encryption, the spectacular Internet of Things (IoT) penetration across sectors such as e-health, energy, transportation, and entertainment is expanding the attack surface ... [more ▼]

Even in the face of strong encryption, the spectacular Internet of Things (IoT) penetration across sectors such as e-health, energy, transportation, and entertainment is expanding the attack surface, which can seriously harm users’ privacy. We demonstrate in this paper that an attacker is able to disclose sensitive information about the IoT device, such as its type,by identifying specific patterns in IoT traffic. To perform the fingerprint attack, we train machine-learning algorithms based on selected features extracted from the encrypted IoT traffic.Extensive simulations involving the baseline approach show that we achieve not only a significant mean accuracy improvement of 18.5% and but also a speedup of 18.39 times for finding the best estimators. Obtained results should spur the attention of policymakers and IoT vendors to secure the IoT devices they bring to market. [less ▲]

Detailed reference viewed: 531 (14 UL)
Full Text
Peer Reviewed
See detailThe Importance of Socio-Emotional Skills and Behaviour in Preschool for Later Outcomes
Aleksic, Gabrijela UL; Christine, Merrell; Peter, Tymms

Scientific Conference (2019, April 18)

Background to the Study In order to meet the socio-economic challenges of the 21st century, a blend of cognitive and socio-emotional skills is required (Temple, 2002). Socio-emotional skills are important ... [more ▼]

Background to the Study In order to meet the socio-economic challenges of the 21st century, a blend of cognitive and socio-emotional skills is required (Temple, 2002). Socio-emotional skills are important for personal well-being, life satisfaction, healthy life styles, active citizenship and safer societies (OECD, 2015). No study in Serbia has investigated the development of young children’s socio-emotional skills and behaviour, and the relationship with academic progress in Serbia before and this directly responds to the urgent call for more information concerning the Serbian preschool education (Baucal et al., 2016). The findings are of broader relevance to other countries; as noted in the OECD (2015) report, socio-emotional development continues through late childhood and adolescence which gives a space for intervention programmes that can help reduce social inequalities among children. Theoretical Framework Socio-emotional skills are a range of competences including emotion knowledge, emotional and behavioural regulatory abilities and social skills (Denham, 2006). When children enter school and have positive peer and teacher interactions, they will develop more positive attitudes towards school tasks, engage more into school activities, be more persistent and perform higher (e.g., Arnold et al., 2012; Fantuzzo et al., 2007). Furthermore, studies have shown that children with behavioural difficulties such as inattention, hyperactivity and impulsivity display more delinquent behaviour as adolescents and achieve academically lower than their peers (e.g., Frazier et al., 2007; Merrell et al., 2017). Data In this empirical study we explored the links between socio-emotional skills, behaviour, mathematics and literacy performance of preschool children in Serbia over the course of 14 months. Teachers rated 159 children (51% of girls) aged 5-8 by Personal, social and emotional development scale, and Behaviour rating scale on inattention, hyperactivity and impulsivity. These scales were included in the Performance Indicators in Primary School (PIPS; Tymms, 1999), an adaptive test that measures early literacy and mathematics. Results • At all three times, girls were rated more positively than boys in socio-emotional skills and behaviour, except for adjustment to school setting where there were no differences. • At Time 3, when children entered school, their socio-emotional skills and behaviour were associated with gender, mathematics at Time 1 and their socio-emotional and behaviour ratings at Time 2, controlling for maternal education at Time 1. • Mathematics at Time 3 was not associated with socio-emotional skills nor with specific behaviour. • Literacy at Time 3 was associated with mathematics and social skills at Time 1, and literacy at Time 2, controlling for gender and maternal education. Significance of the Study This study offers the first insight into the links between socio-emotional skills, behaviour and mathematics and literacy performance of preschool children in Serbia which will inform the development and evaluation of interventions. Attrition of the sample limits the findings. [less ▲]

Detailed reference viewed: 129 (2 UL)
Full Text
Peer Reviewed
See detailA Calibrated Learning Approach to Distributed Power Allocation in Small Cell Networks
Zhang, Xinruo; Nakhai; Zheng, Gan UL et al

in ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) (2019, April 17)

This paper studies the problem of max-min fairness power allocation in distributed small cell networks operated under the same frequency bandwidth. We introduce a calibrated learning enhanced time ... [more ▼]

This paper studies the problem of max-min fairness power allocation in distributed small cell networks operated under the same frequency bandwidth. We introduce a calibrated learning enhanced time division multiple access scheme to optimize the transmit power decisions at the small base stations (SBSs) and achieve max-min user fairness in the long run. Provided that the SBSs are autonomous decision makers, the aim of the proposed algorithm is to allow SBSs to gradually improve their forecast of the possible transmit power levels of the other SBSs and react with the best response based on the predicted results at individual time slots. Simulation results validate that in terms of achieving max-min signal-to-interference-plus-noise ratio, the proposed distributed design outperforms two benchmark schemes and achieves a similar performance as compared to the optimal centralized design. [less ▲]

Detailed reference viewed: 27 (0 UL)