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See detailPhase-error correction by single-phase phase-locked loops based on transfer delay
Kobou Ngani, Patrick UL; Hadji-Minaglou, Jean-Régis UL; Marso, Michel UL et al

in Journal of Electrical & Electronic Systems (2015, November 04)

Comparative studies of different single-phase phase-locked loops (PLL) algorithms have been made. They show that the PLL based on sample delay (dPLL), presents the lowest computational load and is as ... [more ▼]

Comparative studies of different single-phase phase-locked loops (PLL) algorithms have been made. They show that the PLL based on sample delay (dPLL), presents the lowest computational load and is as robust as the three-phase synchronous reference frame PLL dqPLL by input signal amplitude and phase variations. Its weakness appears when the input signal frequency differs from its rated frequency: It depicts a steady error on the calculated signal phase-angle. After a brief review of the dqPLL which constitutes debase structure of the dPLL, the following work will present three methods that improve the phase detection accuracy of dPLL. It is shown that the modifications brought in the original structure do not influence the robustness and stability of the algorithm but reduce the phase angle offset error by input signal frequency variation. This is corroborated by tests including not only the fundamental input voltage disturbance like amplitude, phase and frequency variation but also harmonic voltage distortion. [less ▲]

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See detailAdaptive Activity and Context Recognition using Multimodal Sensors in Smart Devices
Faye, Sébastien UL; Frank, Raphaël UL; Engel, Thomas UL

in Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering - Mobile Computing, Applications, and Services (2015, November)

The continuous development of new technologies has led to the creation of a wide range of personal devices embedded with an ever increasing number of miniature sensors. With accelerometers and ... [more ▼]

The continuous development of new technologies has led to the creation of a wide range of personal devices embedded with an ever increasing number of miniature sensors. With accelerometers and technologies such as Bluetooth and Wi-Fi, today's smartphones have the potential to monitor and record a complete history of their owners' movements as well as the context in which they occur. In this article, we focus on four complementary aspects related to the understanding of human behaviour. First, the use of smartwatches in combination with smartphones in order to detect different activities and associated physiological patterns. Next, the use of a scalable and energy-efficient data structure that can represent the detected signal shapes. Then, the use of a supervised classifier (i.e. Support Vector Machine) in parallel with a quantitative survey involving a dozen participants to achieve a deeper understanding of the influence of each collected metric and its use in detecting user activities and contexts. Finally, the use of novel representations to visualize the activities and social interactions of all the users, allowing the creation of quick and easy-to-understand comparisons. The tools used in this article are freely available online under a MIT licence. [less ▲]

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See detailSome remarks on the influence of temperature-variations, non-linearities, repeatability and ageing on modal-analysis for structural health monitoring of real bridges
Maas, Stefan UL; Schommer, Sebastian UL; Nguyen, Viet Ha UL et al

in MATEC Web of Conferences (2015, October 19), 24(Article No. 05006),

Structural Health Monitoring (SHM) intends to identify damage by changes of characteristics as for instance the modal parameters. The eigenfrequencies, mode-shapes and damping-values are either directly ... [more ▼]

Structural Health Monitoring (SHM) intends to identify damage by changes of characteristics as for instance the modal parameters. The eigenfrequencies, mode-shapes and damping-values are either directly used as damage indicators or the changes of derived parameters are analysed, such as e.g. flexibilities or updated finite element models. One common way is a ontinuous monitoring under environmental excitation forces, such as wind or traffic, i.e. the so-called output-only modal analysis. Alternatively, a forced measured external excitation in distinct time-intervals may be used for input-output modal analysis. Both methods are limited by the precision or the repeatability under real-life conditions at site. The paper will summarize everal field tests of artificially step by step damaged bridges prior to their final demolishment and it will show the changes of eigenfrequencies due to induced artificial damage. Additionally, some results of a monitoring campaign of a healthy bridge in Luxembourg are presented. Reinforced concrete shows non-linear behaviour in the sense that modal parameters depend on the excitation force amplitude, i.e. higher forces lead often to lower eigenfrequencies than smaller forces. Furthermore, the temperature of real bridges is neither constant in space nor in time, while for instance the stiffness of asphalt is strongly dependant on it. Finally, ageing as uch can also change a bridge’s stiffness and its modal parameters, e.g. because creep and hrinkage of concrete or ageing of elastomeric bearing pads influence their modulus of elasticity. These effects cannot be considered as damage, though they influence the measurement of modal parameters and hinder damage detection. [less ▲]

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See detailRobot and Human safety in a semi-automated assembly workspace
Ahmad, Rafiq UL

in IEEE transactions (2015, October 02)

Robots used for automation in industries should be able to react to any uncomfortable situations in their vicinity in order to avoid harming humans, working product, other machinery and itself. The ... [more ▼]

Robots used for automation in industries should be able to react to any uncomfortable situations in their vicinity in order to avoid harming humans, working product, other machinery and itself. The manipulator robots might not only be able to predict potential collisions but should also be able to take intelligent decisions for automatically avoiding them with a safe detour around the obstacles. This paper introduces a 3D-Time- of-Flight sensor based SARPP algorithm which automatically plans path for the robot in a human robot collaborative semi- automated assembly environment. The application of algorithm can be foreseen in more complex Human-Robot-Collaborative industrial environment where the safety of human as well as robots are the highest priority. [less ▲]

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See detailUser Required? On the Value of User Research in the Digital Humanities
Kemman, Max UL; Kleppe, Martijn

in Linköping Electronic Conference Proceedings (2015, August 26), (116), 63-74

Although computational tools play an increasingly important role in the humanities, adoption of tools by scholars does not always reach its potential. One approach to this problem is user research to ... [more ▼]

Although computational tools play an increasingly important role in the humanities, adoption of tools by scholars does not always reach its potential. One approach to this problem is user research to uncover the needs of the users. However, it is uncertain whether such user requirements can be generalized to a wider group of humanities scholars, and whether users are able to explicate their requirements for methodological innovation. We ask what the role of user research is in the Digital Humanities by discussing gathered user requirements for two projects. We categorized the requirements as within- or out-of-scope of the projects’ goals, and found a tension between the specificity of humanities’ research methods, and generalizability for a broader applicable tool. With the out-of-scope requirements we are able to map the wider research workflow, showing DH tools will most likely take a spot in the wider workflow, and that it is infeasible to create a tool for the entire workflow that is generic enough for a larger user group. However, the within-scope requirements led to features that were sufficiently generic for the tool to be adopted, also for unintended purposes. These insights show user research has a clear benefit for DH projects. [less ▲]

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See detailBitloaded Modified Enhanced Subcarrier Index Modulation OFDM for Visible Light Communications
Monzon Baeza, Victor UL; Garcia Fernandez, Juan Jose; Garcia Armada, Ana

in 2nd International Conference on Wireless Communication Systems and Networks MIC-Wireless 2015 (2015, August)

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See detailTestbed for a LiFi system integrated in streetlights
Monzon Baeza, Victor UL; Sánchez-Fernández, Matilde; Garcia Armada, Ana et al

in European Conference on Networks and Communications (EuCNC) (2015, July)

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See detailValue Stream Management in the "Lean Manufacturing Laboratory"
Oberhausen, Christof UL; Plapper, Peter UL

in Procedia CIRP (2015, July), 32

The University of Luxembourg has recently launched its learning factory, the “Lean Manufacturing Laboratory”. With the help of this manual assembly line, students gain valuable insights in the operation ... [more ▼]

The University of Luxembourg has recently launched its learning factory, the “Lean Manufacturing Laboratory”. With the help of this manual assembly line, students gain valuable insights in the operation of a manufacturing line as well as in buffer, waste and congestion management. Currently, one of the main research topics at the University of Luxembourg in the field of Lean Management is the further development of the method Value Stream Management (VSM). The application of VSM in the “Lean Manufacturing Laboratory” with a projected focus on industry and service sectors reveals the need for a standardized VSM approach. Thus, one of the research objectives is the development of a common VSM method accompanied by standardized software and process interfaces to ensure robust product and information flows within a company and also throughout supply chains. On the way towards a VSM method as standard, existing VSM approaches have to be investigated and validated. By a detailed comparison of existing VSM approaches, all necessary fields of action for the development of a standardized Value Stream Management approach are shown. [less ▲]

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See detailEvaluation of basic motor competencies in primary school children: Development of a test instrument
Scheuer, Claude; Bund, Andreas UL; Herrmann, Christian

in Revista Espanola de Educación Física y Deporte (2015, July), 410 (Supl.)(3), 486

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See detailCu2SnS3-based thin film solar cell from electrodeposition-annealing route
Robert, Erika UL; De Wild, Jessica UL; Dale, Phillip UL

in IEEE Proceedings (2015, June)

Cu2SnS3 is a new emerging material for thin film photovoltaics, composed of three abundant and non toxic elements. Its p-type conductivity, bandgap of 0.93 eV and absorption coefficient above 104 cm-1 ... [more ▼]

Cu2SnS3 is a new emerging material for thin film photovoltaics, composed of three abundant and non toxic elements. Its p-type conductivity, bandgap of 0.93 eV and absorption coefficient above 104 cm-1 make it a promising absorber layer for p-n heterojunction devices. In this study, the Cu2SnS3 absorber is synthesized from electroplated stacked Cu-Sn precursors further annealed in chalcogen atmosphere (S and SnS). The electroplating has been processed on upscaled 45 x 50 mm2 Mo-coated soda-lime glass substrates on which the metallic layers seem to delaminate easily from the substrate due to increased stress between them. To reduce this stress the precursors are subjected to pre-alloying treatments. The effects of pre-alloying are investigated in terms of final absorber morphology, composition and crystal structure. Precursors are annealed at 250°C and 350°C. The prealloying at 350°C is far above the melting point of Sn around 230°C and these samples show de-wetting. The as-deposited and 250°C pre-alloyed samples are processed further into absorber layers and solar cells. The finished absorber layers show mainly monoclinic Cu2SnS3. Absorbers completed into devices show a device power conversion efficiency of 0.64%. The spectral response suggests the existence of two bandgaps, consistent with previous results. [less ▲]

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See detailMining Patterns of Unsatisfiable Constraints to Detect Infeasible Paths
DING, SUN; TAN, HEE BENG KUAN; Shar, Lwin Khin UL

in Automation of Software Test (AST 2015) (2015, May)

Detection of infeasible paths is required in many areas including test coverage analysis, test case generation, security vulnerability analysis, etc. Existing approaches typically use static analysis ... [more ▼]

Detection of infeasible paths is required in many areas including test coverage analysis, test case generation, security vulnerability analysis, etc. Existing approaches typically use static analysis coupled with symbolic evaluation, heuristics, or path-pattern analysis. This paper is related to these approaches but with a different objective. It is to analyze code of real systems to build patterns of unsatisfiable constraints in infeasible paths. The resulting patterns can be used to detect infeasible paths without the use of constraint solver and evaluation of function calls involved, thus improving scalability. The patterns can be built gradually. Evaluation of the proposed approach shows promising results. [less ▲]

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See detailVerification and Implementation of Pseudo-Random-Binary-Sequences for Online Determination of Grid Impedance Spectrum
Tewari, Udit; Neshvad, Surena UL; Sachau, Jürgen UL

in The Renewable Energy & Power Quality Journal (2015, March 25)

The number of inverter based distributed power generators connected to the power network has rapidly grown in recent years. The consequence of this phenomenon is an increasingly complex distribution grid ... [more ▼]

The number of inverter based distributed power generators connected to the power network has rapidly grown in recent years. The consequence of this phenomenon is an increasingly complex distribution grid, requiring advanced and intelligent monitoring and observation tools in order to guarantee satisfactory power quality and reliability. This paper describes a novel power line impedance estimation method, implementing an innovative technique based on modifications of the Pulse Width Modulator’s pulse pattern on the inverters, in order to generate Pseudo-Random Binary Sequence based pilot signals. The stimuli are generated at different locations in the distribution grid, and detected at the transformer sub-station through cross correlation between the received distorted signal and the sequence, the parameters of the propagation channel can be estimated. Simulations in typical grid situations verify that the proposed algorithm is robust to a realistic environment and would [less ▲]

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See detailDie aktuellen Familienkonzepte der Europäischen Kommission und ihre Umsetzung in der Volkszählung 2011 – Ein Erfahrungsbericht aus Luxemburg
Heinz, Andreas UL; Willems, Helmut UL

in DGD-Online-Publikation (2015, March 13), (01/2015), 114-121

In der luxemburgischen Volkszählung 2001 wurde die Haushaltszusammensetzung erhoben, indem abgefragt wurde, in welcher Beziehung jedes Haushaltsmitglied zur Referenzperson steht. Diese Frage ist leicht zu ... [more ▼]

In der luxemburgischen Volkszählung 2001 wurde die Haushaltszusammensetzung erhoben, indem abgefragt wurde, in welcher Beziehung jedes Haushaltsmitglied zur Referenzperson steht. Diese Frage ist leicht zu beantworten und die Methode wird bis heute in zahlreichen Umfragen genutzt. Das Hauptproblem dieser Methode besteht darin, dass nicht erhoben wird, in welcher Beziehung die Nichtreferenzpersonen untereinander stehen. Damit ist die Information über die Haushaltszusammensetzung davon abhängig, wer den Fragebogen ausfüllt: Über ein und denselben Haushalt können unterschiedliche Angaben vorliegen, je nachdem ob die Mutter, der Großvater oder eine sonstige Person den Fragebogen ausfüllt. Diese Methode ist für die familiensoziologische Forschung wenig ergiebig und sie reicht nicht aus, um die Vorgaben der EU für die Volkszählungen 2011 zu erfüllen. Daher wurden zum einen Antwortkategorien ergänzt und zum anderen wurden die Beziehungen von jedem Haushaltsmitglied zu jedem anderen erhoben. Bei der ersten Umsetzung im Jahr 2011 bedeutet dies einen höheren Aufwand für die Aufbereitung der Daten vor der Eingabe sowie für die Einteilung gemäß der EU-Klassifikation. Allerdings ist mit dieser Methode ein deutlich höherer Informationsgehalt verbunden. Des Weiteren ist davon auszugehen, dass der Aufwand für erneute Anwendung im Jahr 2021 deutlich geringer ausfällt, sofern mehr Personen den Fragebogen der Volkszählung online ausfüllen und die EU-Klassifikation beibehalten wird. Inhaltlich eignet sich die EU-Klassifikation sehr gut, um familiensoziologische Fragen zu beantworten. Exemplarisch wird dies anhand unterschiedlichen private Übergänge von der Jugend zum Erwachsenenalter sowie der Übergänge vom mittleren zum höheren Erwachsenenalter der luxemburgischen und portugiesischen Bevölkerung Luxemburgs gezeigt. [less ▲]

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See detailBluetooth Low Energy Robustness Analysis for V2V Communications
Bronzi, Walter UL

in Ulmer Informatik-Berichte (2015, March)

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See detailAdaptive methods for multiscale fracture
Bordas, Stéphane UL; Kerfriden, Pierre; Akbari, Ahmad et al

in International Journal of Engineering Science (2015, January 01)

Adaptive methods for multiscale fracture In this work, we discuss two classes of methods to reduce the complexity of (multi scale) fracture simulations. In a first part, we discuss algebraic model ... [more ▼]

Adaptive methods for multiscale fracture In this work, we discuss two classes of methods to reduce the complexity of (multi scale) fracture simulations. In a first part, we discuss algebraic model reduction. We show that algebraic model reduction such as the proper orthogonal decomposition cannot be used directly because of the lack of corelation introduced by the damage or cracks. We demonstrate the use of proper orthogonal decompositions by subdomains as a candidate to reduce computational expenses in non-linear fracture simulations whilst controlling the error level. We then consider algebraic model reduction, namely the proper orthogonal decomposition(POD) to drastically reduce the computational time associated with computing the response of representative volume elements (RVEs) used in homogenization, e.g. by the FE2 method. The snapshots are obtained by solving the RVE boundary value problem for various loading paths. To speed-up the computations, system approximation through the discrete empirical interpolation (DEIM) is used and allows the evaluation of the internal forces for only a small subset of the elements making the RVE structure. In a second part, we propose an adaptive hybrid multiscale method for modelling fracture in a heterogeneous material that is composed of orthotropic grains with cohesive interfaces between the grains. Instead of a direct solver, FE2 method [1] based on homogenisation is employed in order to compute the effective behaviour of the heterogeneous microscopic material on the coarser scale. At this scale the modelling error due to the homogenisation is still low [3]. The coarse scale is discretized with unstructured triangular finite elements, and adaptive mesh refinement is used to control the discretizsation error. While the mesh refinement keeps the discretisation error with in a certain range, the modelling error increases due to the fact that by refining the coarse elements, the scale separation assumption which is a key issue for homogenisation may no longer be fulfilled [4]. Whereas the modelling error is inversely proportional to the size of the coarse elements, a critical element size can be found that corresponds to the critical value of the modelling error. A critical zone emerges when the size of a coarse element reaches the critical size, or if the underlying representative volume element of the microstructure loses stability due to localisation (lack of scale separation). Thereafter, a zoom-in process is triggered that replaces the corresponding coarse elements of the critical zone with high resolution microscale mesh to which it glues the coarse scale mesh through a strong coupling technique using Lagrange multipliers [5]. The high resolution region can gradually be extended to include the newly emerging critical zones. A local arc-length technique is adopted to trace the highly non-linear curve of the global load-displacement by controlling the opening of microscopic cohesive cracks in the fully resolved regions. The proposed adaptive multiscale method allows us to introduce progressive discrete micro cracks at the macroscale. The unstructured mesh enables us to model problems with non-regular shapes, and the arc-length method, defined over multiple scales, allows the regularisation of softening problems that are treated in quasi-statics. We exercise this method on the simulation of polycrystalline fracture, where each grain is considered orthotropic and compare results to direct numerical simulation. [less ▲]

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See detailDesign optimization of front and rear aerodynamic wings of a high performance race car with modified airfoil structure
Muralidharan, Vivek UL; Balakrishnan, Abhijith; Kumar, Suresh Y.

in 2015 International Conference on Nascent Technologies in the Engineering Field (ICNTE) (2015, January)

Formula Student Racing competitions are international events organized by Society of Automotive Engineers globally at various Formula SAE Circuits. Teams comprising of college students worldwide thrive to ... [more ▼]

Formula Student Racing competitions are international events organized by Society of Automotive Engineers globally at various Formula SAE Circuits. Teams comprising of college students worldwide thrive to build a Formula style race car to compete at these events. In this high octane racing event every team tries to have an inch over their opponents by reducing lap timings. The best way for minimal lap timings is better performance along the straights and a good cornering. It becomes difficult for cars to get good traction when traveling at high speeds as well as they need to reduce their speeds drastically to take sharp corners. To maximize the performance of team NITK Racing car for such events an aerodynamic wings package at the front and the rear is proposed which produces sufficient down-force when accelerating in the straights as well as allowing sharp corners at relatively higher speeds. Being a student based competition intense amount of care is given to the safety precautions. Cars having sharp corners and protrusions are liable to be disqualified and hence the wing tip needs to be modified in order to satisfy the safety rules of the competition. [less ▲]

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See detailTowards a full support of obligations in XACML
El Kateb, Donia UL; Elrakaiby, Yehia UL; Mouelhi, T. et al

in Lecture Notes in Computer Science (2015), 8924

Policy-based systems rely on the separation of concerns, by implementing independently a software system and its associated security policy. XACML (eXtensible Access Control Markup Language) proposes a ... [more ▼]

Policy-based systems rely on the separation of concerns, by implementing independently a software system and its associated security policy. XACML (eXtensible Access Control Markup Language) proposes a conceptual architecture and a policy language to reflect this ideal design of policy-based systems.However, while rights are well-captured by authorizations, duties, also called obligations, are not well managed by XACML architecture. The current version of XACML lacks (1) well-defined syntax to express obligations and (2) an unified model to handle decision making w.r.t. obligation states and the history of obligations fulfillment/ violation. In this work, we propose an extension of XACML reference model that integrates obligation states in the decision making process.We have extended XACML language and architecture for a better obligations support and have shown how obligations are managed in our proposed extended XACML architecture: OB-XACML. © Springer International Publishing Switzerland 2015. [less ▲]

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See detailUpward social mobility and life satisfaction: the cases of United Kingdom and Switzerland
Samuel, Robin UL; Hadjar, Andreas UL

in Longitudinal and Life Course Studies (2015), 6(3), 13-14

Status is a major determinant of subjective well-being (SWB). This is one of the primary assumptions of social production function theory. In contrast, the dissociative hypothesis holds that upward social ... [more ▼]

Status is a major determinant of subjective well-being (SWB). This is one of the primary assumptions of social production function theory. In contrast, the dissociative hypothesis holds that upward social mobility may be linked to identity problems, cognitive distress, and reduced levels of SWB because of lost ties to one’s class of origin. In our paper, we use panel data from the United Kingdom (British Household Panel Survey) and Switzerland (Swiss Household Panel) to test these hypotheses. These two countries are compared because historically, social inequality and upward mobility have played distinct roles in each country’s popular discourse. We conduct longitudinal multilevel analyses to gauge the effects of intragenerational and intergenerational upward mobility on life satisfaction (as a cognitive component of SWB), controlling for previous levels of life satisfaction, dynamic class membership, and well-researched determinants of SWB such as age and health problems. Our results provide some evidence for effects of social class and social mobility on well-being in the UK sample, however, there are no such effects in the Swiss sample. The UK findings support the idea of dissociative effects, that is, intergenerational upward mobility is negatively associated with SWB. [less ▲]

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See detailHow can we promote cognitive reserve during the life course? Social, behavioral, contextual factors
Leist, Anja UL

in Gerontologist (2015), 55(Suppl 2), 210

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See detailSafe and Automated Assembly Process using Vision assisted Robot Manipulator
Ahmad, Rafiq UL; Plapper, Peter UL

in Procedia CIRP (2015)

Many manufacturing industries especially small and medium size (SMEs) industries are reluctant to automatize their production using robots. This is due to the fact that mostly industrial robots are not ... [more ▼]

Many manufacturing industries especially small and medium size (SMEs) industries are reluctant to automatize their production using robots. This is due to the fact that mostly industrial robots are not properly equipped to recognize their surrounding and take intelligent decisions regarding path planning especially for low volume, flexible production with versatile production lines. The proposed idea is that a robot manipulator performing assembly or disassembly tasks should be able to predict potential collisions even with unknown obstacles and must be able to prevent i.e. react automatically for safe detour around obstacle. Currently, industrial robots have tactile sensing abilities, which detect collisions after a real contact but the existing proposals for its avoidance are either computationally expensive, need prior information about the obstacles or not very well adapted to the safety standards. Therefore, this paper introduces a ToF sensor based information collection and intelligent decision methodology in order to localize the un-known, un-programmed obstacles and propose a safe peg-in-hole automated assembly process. In the case of collisions, the proposed method will provide various solutions and decides for the best solution according to the scenario on-hand. The proposed solution is quick and robust and currently applied for static environment, whereas dynamic obstacles will be treated in future. [less ▲]

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See detailFeasibility study of full-duplex relaying in satellite networks
Bhavani Shankar, M. R.; Zheng, G.; Maleki, Sina UL et al

in IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC (2015), 2015-August

With the successful implementation of full-duplex radio prototypes, traditional orthogonal half-duplex communications is deemed to be inefficient in certain terrestrial applications. While full-duplex ... [more ▼]

With the successful implementation of full-duplex radio prototypes, traditional orthogonal half-duplex communications is deemed to be inefficient in certain terrestrial applications. While full-duplex techniques are gaining interest in terrestrial communications, thanks to the trend of short-distance and low-power transmissions, their application to satellite communications has drawn little attention. Motivated by this, the paper explores the use of the full-duplex relaying operation on-board the satellite in a DVB-S2 compliant network. Self-interference, whose management is the key component of a full-duplex communication, is the focus of study in this paper. Modelling the effects of self-interference and power amplifier nonlinearities on the quality of the received signal in undertaken. Subsequently, closed-form expressions for the various interference components are derived. The numerical evaluations of derived expressions rely on realistic link budgets and indicate substantial gains in spectral efficiency when self-interference can be well calibrated and measured. This confirms that the satellite full-duplex communications could be a promising solution for the efficient use of satellite spectrum, at least from a technical point of view. © 2015 IEEE. [less ▲]

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See detailFormal Specification, Verification, and Implementation of Fault-Tolerant Systems using EventML
Rahli, Vincent UL; Guaspari, David; Bickford, Mark et al

in EASST (2015)

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See detailIncome inequality and health: Age-related health gains for those better-off, in more equal societies
Chauvel, Louis UL; Leist, Anja UL

in Gerontologist (2015), 55(Suppl 2), 459-460

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See detailRelative breathless: Comparison with others can affect feelings of breathlessness.
Petersen, Sibylle UL; Van den Bergh, Omer

in Biological Psychology (2015), 104

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See detailDynamic Thermal Simulations for Developing Early-Stage Assessments for Office Buildings
Degens, Anja; Scholzen, Frank UL; Odenbreit, Christoph UL

in EPFL scientific publications (2015)

Office buildings account for a large portion of the total energy consumption in Europe because due to increased comfort requirements almost all recent buildings are air-conditioned. This project is ... [more ▼]

Office buildings account for a large portion of the total energy consumption in Europe because due to increased comfort requirements almost all recent buildings are air-conditioned. This project is focused on the influence of thermal storage capacity of commonly used structure types of office buildings and different technical strategies on energy efficiency and thermal comfort. The technical parameter ventilation strategy is essential compared to the parameters structure type or window-to-wall ratio. Additionally a lighting control system based on solar radiation shows a high influence on the internal gains and in consequence on the overheating hours. The slab type respectively the accessibiltiy of the thermal mass has a significantly higher influence than the differences of “massivity” between solid and light weight structures. [less ▲]

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See detailPrediction of Photovoltaic Cu(In,Ga)Se2 p-n Device Performance by forward Bias Electrochemical Analysis of Only the p-Type Cu(In,Ga)Se2 Films
Colombara, Diego UL; Bertram, Tobias UL; Depredurand, Valérie UL et al

in Electrochemical Society Transactions (2015), 66(6), 19-25

This work is an attempt to rate the quality of Mo/Cu(In,Ga)Se2 films intended for fabrication of photovoltaic devices. The procedure is based on the simple current-voltage electrochemical analysis of the ... [more ▼]

This work is an attempt to rate the quality of Mo/Cu(In,Ga)Se2 films intended for fabrication of photovoltaic devices. The procedure is based on the simple current-voltage electrochemical analysis of the bilayer in a Eu2+/3+-containing electrolyte solution. Two series of bilayer samples were tested electrochemically, while sister samples were completed into Mo/Cu(In,Ga)Se2/CdS/i-ZnO/Al:ZnO/Ni-Al solid state devices and their current-voltage characteristics measured in the dark. A correlation was found between the reverse saturation current density of the solid state devices and an analogous parameter extracted from the electrochemical response in forward bias. While Eu2+ was found to be metastable in water posing restrictions to the application, reproducible measurements were achieved with a methanol-based solution. The intrinsic simplicity of the proposed methodology makes it particularly suitable for the implementation of a low-cost diagnostic tool. [less ▲]

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See detailBody or cup? Alterations in featural and configural body image processing in anorexia nervosa
Lutz, Annika UL; Herbert, Cornelia; Schulz, André UL et al

in Psychophysiology (2015), 52(supplement 1), 123

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See detailAnticipation of brain shift in Deep Brain Stimulation automatic planning
Bilger, Alexandre UL; Cotin, Stephane; Duriez, Christian et al

in IEEE Engineering in Medicine and Biology Society (2015)

Deep Brain Stimulation is a neurosurgery procedure consisting in implanting an electrode in a deep structure of the brain. This intervention requires a preoperative planning phase, with a millimetric ... [more ▼]

Deep Brain Stimulation is a neurosurgery procedure consisting in implanting an electrode in a deep structure of the brain. This intervention requires a preoperative planning phase, with a millimetric accuracy, in which surgeons decide the best placement of the electrode depending on a set of surgical rules. However, brain tissues may deform during the surgery because of the brain shift phenomenon, leading the electrode to mistake the target, or moreover to damage a vital anatomical structure. In this paper, we present a patient-specific automatic planning approach for DBS procedures which accounts for brain deformation. Our approach couples an optimization algorithm with FEM based brain shift simulation. The system was tested successfully on a patient-specific 3D model, and was compared to a planning without considering brain shift. The obtained results point out the importance of performing planning in dynamic conditions. [less ▲]

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See detailA randomized controlled non-inferiority trial of primary care-based facilitated access to an alcohol reduction website (EFAR-FVG): preliminary results
Struzzo, Pierluigi; Vedova, Roberto; Ferrante, Donatella et al

in Addiction Science and Clinical Practice (2015), 10(Suppl 2), 29

Background The effectiveness of brief interventions for risky drinkers by GPs is well documented.[1] However, implementation levels remain low. Facilitated access to an alcohol reduction website offers an ... [more ▼]

Background The effectiveness of brief interventions for risky drinkers by GPs is well documented.[1] However, implementation levels remain low. Facilitated access to an alcohol reduction website offers an alternative to standard face-to-face intervention, but it is unclear whether it is as effective.[2] This study evaluates whether online brief intervention, through GP facilitated access to an alcohol reduction website for risky drinkers, is not inferior to the face-to-face brief intervention conducted by GPs. Material and methods In a northern Italy region participating GPs actively encouraged all patients age 18 attending their practice, to access an online screening website based on AUDIT-C.[3] Those screening positive underwent a baseline assessment with the AUDIT-10[4] and EQ-5D[5] questionnaires and subsequently, were randomly assigned to receive either online counselling on the alcohol reduction website (intervention) or face-to-face intervention based on the brief motivational interview[6] by their GP (control). Follow-up took place at 3 and 12 months and the outcome was calculated on the basis of the proportion of risky drinkers in each group according to the AUDIT-10. Results More than 50% (n= 3974) of the patients who received facilitated access logged-on to the website and completed the AUDIT-C. Just under 20% (n = 718) screened positive and 94% (n= 674) of them completed the baseline questionnaires and were randomized. Of the 310 patients randomized to the experimental Internet intervention, 90% (n = 278) logged-on to the site. Of the 364 patients of the control group, 72% (263) were seen by their GP. A follow-up rate of 94% was achieved at 3 months. Conclusions The offer of GP facilitated access to an alcohol reduction website appears to be an effective way of identifying risky drinkers and enabling them to receive brief intervention. [less ▲]

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See detailDynamic and complex optical patterns from colloids of cholesteric liquid crystal droplets
Noh, Junghyun UL; Drevensek-Olenik, Irena; Yamamoto, Jun et al

in Proceedings of the SPIE (2015), 9384

Drops or shells of a planar-aligned short-pitch cholesteric liquid crystal exhibit unique optical properties due to the combination of Bragg reflection in the cholesteric helix and a radial orientation of ... [more ▼]

Drops or shells of a planar-aligned short-pitch cholesteric liquid crystal exhibit unique optical properties due to the combination of Bragg reflection in the cholesteric helix and a radial orientation of the helix axis. If such a droplet is illuminated from above, light is reflected into a continuous set of cones, the opening angles of which depend on where on the droplet the light hits its surface. For the wavelength that fulfills the Bragg condition the reflection is dramatically enhanced, yielding the light cones colored. A photonic cross communication scheme arises for certain angles, reflecting light back to the observer from a different droplet than the one originally illuminated. This gives rise to an intricate pattern of colored and circularly polarized spots. A number of interesting applications may be developed based on this pattern, e.g. in identification and authentication devices. We have carried out a detailed spectrophotometric analysis of the patterns, localized to individual spot maxima. A quantitative comparison between the measured spectra and the reflection wavelength expected from a model for the pattern generation allows us to conclude that the droplets are in fact not spherical but slightly ellipsoidal. [less ▲]

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See detailTransitively Consistent and Unbiased Multi-Image Registration Using Numerically Stable Transformation Synchronisation
Bernard, Florian UL; Thunberg, Johan UL; Salamanca Mino, Luis UL et al

in MIDAS Journal (2015)

Abstract. Transitive consistency of pairwise transformations is a desir- able property of groupwise image registration procedures. The transfor- mation synchronisation method [4] is able to retrieve ... [more ▼]

Abstract. Transitive consistency of pairwise transformations is a desir- able property of groupwise image registration procedures. The transfor- mation synchronisation method [4] is able to retrieve transitively con- sistent pairwise transformations from pairwise transformations that are initially not transitively consistent. In the present paper, we present a numerically stable implementation of the transformation synchronisa- tion method for a ne transformations, which can deal with very large translations, such as those occurring in medical images where the coor- dinate origins may be far away from each other. By using this method in conjunction with any pairwise (a ne) image registration algorithm, a transitively consistent and unbiased groupwise image registration can be achieved. Experiments involving the average template generation from 3D brain images demonstrate that the method is more robust with re- spect to outliers and achieves higher registration accuracy compared to reference-based registration. [less ▲]

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See detailL’influence des représentations du « public populaire » sur la conception d’une exposition d’archéologie
Schall, Céline UL; Vilatte, Jean-Christophe

in Questions de Communication (2015)

Lors du montage d’une exposition, un des éléments importants du projet est le choix du public auquel les professionnels des musées souhaitent s’adresser. De quelle(s) manière(s) l’objectif de toucher le « ... [more ▼]

Lors du montage d’une exposition, un des éléments importants du projet est le choix du public auquel les professionnels des musées souhaitent s’adresser. De quelle(s) manière(s) l’objectif de toucher le « public populaire » ou le « grand public » joue-t-il sur les procédures de concep-tion et de réalisation d’une exposition ? Pour répondre à cette question, nous analyserons le cas d’une exposition temporaire d’archéologie à travers le discours de ses concepteurs et son étude sémiotique. Si les représentations spontanées que les différents corps professionnels (scienti-fiques, médiateurs, scénographes) ont de ce « grand public » sont assez proches, elles divergent quand il s’agit d’écrire les textes ou de concevoir des dispositifs de médiation. La notion s’avère peu précise et en définitive peu opérante. Elle conduit les participants à avoir tendance à produire leurs propres stratégies muséographiques, au risque d’incohérences et d’un certain manque de lisibilité. [less ▲]

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See detailDo graphical cues effectively inform users? A socio-technical security study in accessing wifi networks.
Ferreira, Ana UL; Huynen, Jean-Louis UL; Koenig, Vincent UL et al

in Lecture Notes in Computer Science (2015), 9190

We study whether the padlock and the signal strength bars, two visual cues shown in network managers, convey their intended messages. Since users often choose insecure networks when they should not ... [more ▼]

We study whether the padlock and the signal strength bars, two visual cues shown in network managers, convey their intended messages. Since users often choose insecure networks when they should not, finding the answer is not obvious; in our study we clarify whether the problem lies in uninformative and ambiguous cues or in the user who, despite understanding the cues, chooses otherwise. This paper describes experiments and comments the results that bring evidence to our study. [less ▲]

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See detailComputational Complexity of Input/Output Logic
Sun, Xin UL; Ambrossio, Diego Agustin UL

in Lecture Notes in Computer Science (2015), 9426

Input/output logics are abstract structures designed to represent conditional norms. The complexity of input/output logic has been sparsely developed. In this paper we study the complexity of input/output ... [more ▼]

Input/output logics are abstract structures designed to represent conditional norms. The complexity of input/output logic has been sparsely developed. In this paper we study the complexity of input/output logics. We show that the lower bound of the complexity of the fulfillment problem of 4 input/output logics is coNP, while the upper bound is either coNP or P^NP. [less ▲]

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See detailA discrete/continuous numerical approach to multi-physics
Peters, Bernhard UL; Besseron, Xavier UL; Estupinan Donoso, Alvaro Antonio UL et al

in IFAC-PapersOnLine (2015), 28(1), 645-650

A variety of technical applications are not only the physics of a single domain, but include several physical phenomena, and therefore are referred to as multi-physics. As long as the phenomena being ... [more ▼]

A variety of technical applications are not only the physics of a single domain, but include several physical phenomena, and therefore are referred to as multi-physics. As long as the phenomena being taken into account is either continuous or discrete i.e. Euler or Lagrangian a homogeneous solution concept can be employed. However, numerous challenges in engineering include continuous and discrete phase simultaneously, and therefore cannot be solved only by continuous or discrete approaches. Problems include both a continuous and a discrete phase are important in applications of the pharmaceutical Industry e.g. drug production, agriculture and food processing industry, mining, construction and Agricultural machinery, metal production, power generation and systems biology. The Extended Discrete Element Method (XDEM) is a novel technique, which provides a significant advance for the coupled discrete and continuous numerical simulation concepts. It expands the dynamics of particles as described by the classical discrete element method (DEM) by a thermodynamic state or stress/strain coupled as fluid flow or structures for each particle in a continuum phase. XDEM additionally estimates properties such as the interior temperature and/or species distribution. These predictive capabilities are extended to fluid flow through an interaction by heat, mass and momentum transfer important for process engineering. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved. [less ▲]

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See detailWhy medication or tobacco consumption enhance the life satisfaction of cardiovascular patients?
Bucki, Barbara UL; Tchicaya, Anastase; Baumann, Michèle UL

in European Health Psychologist (2015), special

While life satisfaction (LS) promotes the health of cardiovascular patients, LS may be affected by a range of primary and secondary determinants. We analysed LS and its relationships with cardiovascular ... [more ▼]

While life satisfaction (LS) promotes the health of cardiovascular patients, LS may be affected by a range of primary and secondary determinants. We analysed LS and its relationships with cardiovascular risk factors and unhealthy behaviours. Methods. In 2013, 3,632 survivors who underwent coronary angiography in 2008-2009 at the Luxembourgish National Institute of Cardiac Surgery and Cardiological Intervention (INCCI), living at home were asked to estimate, five years after, their LS [1-10] and other health-related variables. Data were analysed via multiple regression models including interaction effects. Findings. LS of the 1,289 participants (age: 69.2±11.1) was 7.3/10. Most were men, employees or manual workers, had secondary education and a 36,000€ or more/year income. The interactions between hypercholesterolemia and hypertension (regression coefficient= 0.628) and with smoking (rc= 0.941) were positively related with LS, but physical inactivity was negatively associated (rc= -0.630). Discussion. Taking medications or maintaining tobacco consumption produces better LS than being ambivalent towards physical activity. Further research is needed to evaluate the efficacy of health interventions eliciting and promoting the behaviour change wheel based on capabilities, opportunities, and motivations. [less ▲]

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See detailResource allocation for cognitive satellite uplink and fixed-service terrestrial coexistence in ka-band
Lagunas, E.; Sharma, Shree Krishna UL; Maleki, Sina UL et al

in Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST (2015), 156

This paper addresses the cognitive Geostationary Orbit (GSO) satellite uplink where satellite terminals reuse frequency bands of Fixed-Service (FS) terrestrial microwave links which are the incumbent ... [more ▼]

This paper addresses the cognitive Geostationary Orbit (GSO) satellite uplink where satellite terminals reuse frequency bands of Fixed-Service (FS) terrestrial microwave links which are the incumbent users in the Ka 27.5-29.5 GHz band. In the scenario considered herein, the transmitted power of the cognitive satellite user has to ensure that the interference impact on potentially present FS links does not exceed the regulatory interference limitations. In order to satisfy the interference constraint and assuming the existence of a complete and reliable FS database, this paper proposes a Joint Power and Carrier Allocation (JPCA) strategy to enable the cognitive uplink access to GSO Fixed Satellite Service (FSS) terminals. The proposed approach identifies the worst FS link per user in terms of interference and divides the amount of tolerable interference among the maximum number of FSS terminal users that can potentially interfere with it. In so doing, the cognitive system is guaranteed to never exceed the prescribed interference threshold. Subsequently, powers and carriers are jointly allocated so as to maximize the throughput of the FSS system. Supporting results based on numerical simulations are provided. It is shown that the proposed cognitive approach represents a promising solution to significantly boost the performance of conventional satellite systems. © Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2015. [less ▲]

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See detailCombining Input/Output logic and Rei cation for representing real-world obligations
Robaldo, Livio UL; Humphreys, Llio UL; Sun, Xin et al

in Proceedings of the 9th International Workshop on Juris-informatic (JURISIN 2015) (2015)

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See detailMotivations to care and health motivations: A qualitative study exploring the experience of family caregivers
Spitz, Elisabeth; Bucki; Baumann, Michèle UL

in European Health Psychologist (2015)

Background. The COM-B system adapted to family caregivers analyses health capability through capabilities, opportunities, and motivations. Focusing on motivations, this study investigated the motivations ... [more ▼]

Background. The COM-B system adapted to family caregivers analyses health capability through capabilities, opportunities, and motivations. Focusing on motivations, this study investigated the motivations to be a family caregiver and the motivations to maintain one’s own health. Methods. Semi-structured interviews were conducted with 14 caregivers of stroke victims (France: n=8; Luxembourg: n=6; 50% male; age 63.6±10.1) about how they preserve their health and their resources to attain optimal health. Verbatims about their motivations to care for their relative and their motivation to maintain their own health were open-coded. Items were built and validated by consensus with an expert group. Findings. Motivations to care for a relative included the sense of duty, fear of guilt or deception, perceived need and feelings like love. The motivations to maintain personal health were intrinsic (self-; family-oriented), related to caregiving, and extrinsic (induced by relatives and material needs) and encompass amotivation. Discussion. It is relevant to integrate feelings, anticipated regret, moral norms and health value to the COM-B system adapted to family caregivers. Identifying their contribution to health capability will help orient psycho-educational interventions implementation. [less ▲]

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See detailTopological States in Multi-Orbital Honeycomb Lattices of HgTe (CdTe) Quantum Dots
Beugeling, Wouter; Kalesaki, Efterpi UL; Delerue, Christophe et al

in ECS Transactions (2015), 69(5), 81-88

We summarize recent theoretical works on artificial graphene realized by honeycomb lattices of semiconductor (CdSe, HgTe, CdTe) quantum dots forming a two-dimensional single-crystalline sheet. In the case ... [more ▼]

We summarize recent theoretical works on artificial graphene realized by honeycomb lattices of semiconductor (CdSe, HgTe, CdTe) quantum dots forming a two-dimensional single-crystalline sheet. In the case of CdSe, we predict conduction bands with Dirac cones at two distinct energies and nontrivial flat bands. An analogous behavior is found in HgTe but, in addition, the strong spin-orbit coupling opens large topologically nontrivial gaps, leaving a flattened band detached from the others. We deduce that honeycomb lattices of HgTe quantum dots may constitute promising platforms for the observation of a fractional Chern insulator or a fractional quantum spin Hall phase. Similar predictions are made for CdTe but with smaller nontrivial gaps. [less ▲]

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See detailStudents’ Well-being: Impacts of studying out-EU and perceived autonomy on the Psychological Quality of Life
Bucki, Barbara UL; Karavdic, Senad UL; Karathanasi, Chrysoula UL et al

in European Health Psychologist (2015), special

Introduction: With an increasing number of university students in preparation of their entrance in the labor market, the wellbeing of the postgraduates became a priority for many universities. Despite ... [more ▼]

Introduction: With an increasing number of university students in preparation of their entrance in the labor market, the wellbeing of the postgraduates became a priority for many universities. Despite numerous studies on this topic, respective relationships of wellbeing and other psychosocial factors still remain unclear. Aims: (1) to assess Psychological Quality of Life of postgraduates who study in Grand Duchy of Luxembourg (GDL), EU and non – EU countries; (2) to analyze its associations with their socio-economic,health and employability related cofactors. Method: All masters’ students registered at the Centre for Documentation and Information on Higher Education (CEDIES) database in GDL were contacted by mail to participate at an online questionnaire (in English or French) measuring: 1. Psychological Whoqol-bref (6 items) (dependent variable) 2. Wellbeing attributes: Quality of Life Autonomy, Health Satisfaction, and Penn state worry questionnaire (Worries). 3. Employability attributes: Search for Work Self Efficacy scale (SWSES), Career Goals setting. 4. Perceived financial situation and socio-demographic characteristics. Respondents who did not mention the country of their studies were excluded from the analysis. Bivariate tests and correlations were performed for association analyses between the variables. Only significant relationships (p<0.05) were used in the multiple linear model. Results: 490 participants were volunteers from which 13.5% study in Luxembourg, 77.8% in an EU country and 8.7% in a non EU country. Majority were women, with exception for those studying in non-EU countries who were mainly men. Participants studying in GDL were older than those studying abroad. Natives of Luxembourg were prevalent with higher percentages among those who study in a non EU-country. Those studying in non-EU showed significantly (p<0.05) higher Psychological Quality of Life (M=76.8; SD=12.8) than those in GDL (M=74.5;SD=12.6) respectively in EU (M=71.4; SD=15.3). While participants differ in their QoL-Autonomy score there isn’t any significant difference in their career goals setting, Search for work self efficacy, Health satisfaction, Worries and Perceived financial situation across the country of study.Conclusion: Better psychological quality of life mobilized the capability of students to study abroad, which is related to better wellbeing attributes. However this relationship remains true only for students studying in Non-EU countries. Implementing workshops to increase individual self-efficacy towards a future employment may improve and/or maintain wellbeing of academics and limit so, respective social inequalities. [less ▲]

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See detailSystematic assessment of local & global signal control policies: A methodological perspective
Cantelmo, Guido UL; Viti, Francesco UL; Rinaldi, Marco UL et al

in Proceedings of 2015 International Conference on Models and Technologies for Intelligent Transportation Systems, MT-ITS 2015 (2015)

Traffic control performance on networks depends on the flow response to the policy adopted, which in turn contributes to determine the optimal signal settings. This paper focuses on the relationship ... [more ▼]

Traffic control performance on networks depends on the flow response to the policy adopted, which in turn contributes to determine the optimal signal settings. This paper focuses on the relationship between local and network wide traffic control policies within the combined traffic control and assignment problem. Through a full exploration of the solution space, an in depth cross comparison is performed between the well-known local policies P0 and Equisaturation, versus the global policies Maximum Throughput and Minimum Delay, to verify how the two local policies approximate the optimal settings for signalized intersections. Realistic traffic dynamics, such as congestion, multiple controllers and spillback are considered, to empirically determine the conditions under which the local policies are able to approximate global performances. After presenting the different local and global control policies, experiments are performed on simple toy networks. The complexity of the underlying network and, therefore, of the problems' boundary conditions is then increased, allowing us to showcase how the different metrics perform in different situations. Finally, conclusions on the results are drawn. © 2015 BME. [less ▲]

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See detailFull scale BWR containment loca response test at the INKA test facility
Wagner, T.; Leyer, Stephan UL

in International Conference on Nuclear Engineering, Proceedings, ICONE (2015), 2015-January

KERENA is an innovative boiling water reactor concept with passive safety systems (Generation III+) of AREVA. The reactor is an evolutionary design of operating BWRs (Generation II). In order to verify ... [more ▼]

KERENA is an innovative boiling water reactor concept with passive safety systems (Generation III+) of AREVA. The reactor is an evolutionary design of operating BWRs (Generation II). In order to verify the functionality and performance of the KERENA safety concept required for the transient and accident management, the test facility "Integral Teststand Karlstein" (INKA) was built at Karlstein (Germany). It is a mock-up of the KERENA boiling water reactor containment, with integrated pressure suppression system. The complete chain of passive safety components is available. The passive components and the levels are represented in full scale. The volume scaling of the containment compartments is approximately 1:24. The reactor pressure vessel (RPV) is simulated via the steam accumulator of the Karlstein Large Valve Test Facility. This vessel provides an energy storage capacity of approximately 1/6 of the KERENA RPV and is supplied by a Benson boiler with a thermal power of 22 MW. With respect to the available power supply, the containment- and system-sizing of the facility is by far the largest one of its kind worldwide. From 2009 to 2012, several single component tests were conducted (Emergency Condenser, Containment Cooling Condenser, Core Flooding System etc.). On March 21st, 2013, the worldwide first large-scale only passively managed integral accident test of a boiling water reactor was simulated at INKA. The integral test measured the combined response of the KERENA passive safety systems to the postulated initiating event was the "Main Steam Line Break" (MSLB) inside the Containment with decay heat simulation. The results of the performed integral test (MSLB) showed that the passive safety systems alone are capable to bring the plant to stable conditions meeting all required safety targets with sufficient margins. Therefore the test verified the function of those components and the interplay between them as response to an anticipated accident scenario. The test provided evidence that the INKA is worldwide the first large scale test facility to perform integral verification tests of passive safety concepts under plant-like scaling and thermodynamic conditions. Hence, the test facility also shows that it is capable to perform containment response tests for existing Generation II BWRs (with active safety systems) and advanced (passive) reactor designs besides KERENA. These test results can be used to strengthen existing containment codes with regard to heat transfer, natural circulation, gas- and temperature stratification and others. Copyright © 2015 by JSME. [less ▲]

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See detailMulticast multigroup beamforming for per-antenna power constrained large-scale arrays
Christopoulos, Dimitrios UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC (2015), 2015-August

Large in the number of transmit elements, multi-antenna arrays with per-element limitations are in the focus of the present work. In this context, physical layer multigroup multicasting under per-antenna ... [more ▼]

Large in the number of transmit elements, multi-antenna arrays with per-element limitations are in the focus of the present work. In this context, physical layer multigroup multicasting under per-antenna power constrains, is investigated herein. To address this complex optimization problem low-complexity alternatives to semi-definite relaxation are proposed. The goal is to optimize the per-antenna power constrained transmitter in a maximum fairness sense, which is formulated as a non-convex quadratically constrained quadratic problem. Therefore, the recently developed tool of feasible point pursuit and successive convex approximation is extended to account for practical per-antenna power constraints. Interestingly, the novel iterative method exhibits not only superior performance in terms of approaching the relaxed upper bound but also a significant complexity reduction, as the dimensions of the optimization variables increase. Consequently, multicast multigroup beamforming for large-scale array transmitters with per-antenna dedicated amplifiers is rendered computationally efficient and accurate. A preliminary performance evaluation in large-scale systems for which the semi-definite relaxation constantly yields non rank-1 solutions is presented. © 2015 IEEE. [less ▲]

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See detailPower control in cognitive radio networks using cooperative modulation and coding classification
Tsakmalis, Anestis UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST (2015), 156

In this paper, a centralized Power Control (PC) scheme aided by interference channel gain learning is proposed to allow a Cognitive Radio (CR) network to access the frequency band of a Primary User (PU ... [more ▼]

In this paper, a centralized Power Control (PC) scheme aided by interference channel gain learning is proposed to allow a Cognitive Radio (CR) network to access the frequency band of a Primary User (PU) operating based on an Adaptive Coding and Modulation (ACM) protocol. The main idea is the CR network to constantly probe the band of the PU with intelligently designed aggregated interference and sense whether the Modulation and Coding scheme (MCS) of the PU changes in order to learn the interference channels. The coordinated probing is engineered by the Cognitive Base Station (CBS), which assigns appropriate CR power levels in a binary search way. Subsequently, each CR applies a Modulation and Coding Classification (MCC) technique and sends the sensing information through a control channel to the CBS, where all the MCC information is combined using a fusion rule to acquire an MCS estimate of higher accuracy and monitor the probing impact to the PU MCS. After learning the normalized interference channel gains towards the PU, the CBS selects the CR power levels to maximize total CR network throughput while preserving the PU MCS and thus its QoS. The effectiveness of the proposed technique is demonstrated through numerical simulations. © Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2015. [less ▲]

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See detailWeight loss associated with socioeconomic status in patients with angina pectoris, 5 years after an angiography
Tchicaya, Anastase; Baumann, Michèle UL

in Cardiology (2015), (132 (suppl 1)), 60

The aim of the study is to assess the association between weight loss and socioeconomic status (SES) in patients with cardiovascular disease (CVD) such as angina pectoris. Method:In 2013-2014, 1,873 ... [more ▼]

The aim of the study is to assess the association between weight loss and socioeconomic status (SES) in patients with cardiovascular disease (CVD) such as angina pectoris. Method:In 2013-2014, 1,873 patients out of 4,391 that had undergone an angiography in 2008 -2009 participated in a follow-up study. Among these patients, 457 suffered from angina pectoris and were obese or overweight at baseline. A self-administered questionnaire was completed. Moderate weight loss was defined as the loss of 5%-10%, severe weigh loss as more than 10 % of baseline weight. Household-income was used as proxy for SES. Logistic regression was applied to assess the association between weight loss and SES. Results:During the reference period, 28% of the participants lost weight. A moderate weight loss was higher in patients with a household income between 3000€ and 4500€ per month (OR: 2.3; CI 95%: 1.0-5.2) and higher than 4500€ per month (OR: 3.0; CI 95%: 1.3-7.2) compared to the lowest income group (less than 3000€ per month). A severe weight loss was not associated with income. However, a severe weight loss was higher for retired patients (OR: 4.3; CI 95%: 1.1-17.0) compared to non-retired.Conclusion: The potential reduction of health inequality by an elimination of social inequalities in weight loss among patients with angina pectoris might be substantial. Moderate weight loss in overweight patients with angina pectoris at baseline could be associated with household income. Intervention strategies in secondary prevention should address these social inequalities in order to support equity in health. [less ▲]

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See detailGeneralized direct predistortion with adaptive crest factor reduction control
Piazza, Roberto UL; Bhavani Shankar, M. R.; Ottersten, Björn UL

in Proceedings of ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing (2015), 2015-August

Efficient power amplification is inherently a non linear operation that introduces unwanted interference in the amplified signal. Strong inter-symbol interference is generated when the amplifier non ... [more ▼]

Efficient power amplification is inherently a non linear operation that introduces unwanted interference in the amplified signal. Strong inter-symbol interference is generated when the amplifier non linearity is combined with channel memory effects. Further, signals with very high peak to average power ratio, typical of multiple carrier systems, are even more sensitive to the non linearities resulting in severe distortion effects. Signal pre-clipping (crest factor reduction) and predistortion are conventional countermeasure techniques to reduce the generated non linear distortion and improve power and spectral efficiency. In this work, novel optimization methods for predistortion and pre-clipping are analytically derived for a general non-linear communication channel with memory. A combined architecture in which crest factor reduction is followed by signal predistortion is proposed and the parameters are estimated resorting to iterative algorithms based on least squares method. Performance evaluation of the estimation techniques shows the effectiveness of the derived algorithms and significant gain compared to previously known methods. © 2015 IEEE. [less ▲]

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See detailLogic and Games for Ethical Agents in Normative Multi-agent Systems
sun, xin; Robaldo, Livio UL

in Proceedings of 13th European Conference on Multi-Agent Systems/3rd International Conference on Agreement Technologies (2015)

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See detailWillibrord et son action. Une historiographie entre ancrage local et perspectives nationales et internationales (début 19e-début 21e siècle)
Pettiau, Hérold UL

in Hemecht : Zeitschrift für Luxemburger Geschichte = Revue d'Histoire Luxembourgeoise (2014, December), 66(3/4), 317-336

This is an historiographical study of Willibrord, abbot of Echternach and bishop of Utrecht, focussing on the local, luxembourgian context at Echternach, set within a broader national and international ... [more ▼]

This is an historiographical study of Willibrord, abbot of Echternach and bishop of Utrecht, focussing on the local, luxembourgian context at Echternach, set within a broader national and international scholarly context, from the beginning of the 19th century and the beginning of the 21st century. [less ▲]

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See detailWorkplace Relocation and Mobility Changes in a Transnational Metropolitan Area: The Case of the University of Luxembourg
Sprumont, François UL; Viti, Francesco UL; Caruso, Geoffrey UL et al

in Transportation Research Procedia (2014, December), 4

The aim of this paper is to study the utility variation related to the commuting mobility of University staff members due to their future workplace relocation. During the year 2012, a travel survey was ... [more ▼]

The aim of this paper is to study the utility variation related to the commuting mobility of University staff members due to their future workplace relocation. During the year 2012, a travel survey was completed by a total of 397 staff members, representing 36.4% of the university employees, who filled in a questionnaire which revealed complex decision making patterns due to the special traveling scenario involving four countries at once. A Multinomial Logit model has been used to anticipate the impact of university relocation from the capital city to a developing area in the south of the country which will happen between 2015 and 2018 and that will affect most of the employees. The effects of several Travel Demand Management measures are discussed based on the analysis of alternative scenarios [less ▲]

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See detailHuman-Robot Collaboration: Twofold strategy algorithm to avoid collisions using ToF sensor
Ahmad, Rafiq UL; Plapper, Peter UL

in Applied Mechanics and Materials Journal (2014, December)

The importance of Human Robot Interaction to complement human skills in a manufacturing environment with industrial robots increases the concerns over safety of human and the robot. It is necessary to ... [more ▼]

The importance of Human Robot Interaction to complement human skills in a manufacturing environment with industrial robots increases the concerns over safety of human and the robot. It is necessary to identify collision risks and avoid them otherwise production stops may cost a huge amount to the industry. A robot working at manufacturing facility should be able to predict potential collisions and must be able to prevent i.e. react automatically for safe detour around obstacle/human. Currently, industrial robots are able to detect collisions after a real contact but the existing proposals for avoiding collisions are either computationally expensive or not very well adapted to human safety. The objective of this paper is to provide intelligence to the industrial robot to predict collision risks and react automatically without stopping the production in a static environment. The proposed approach using Time of Flight (TOF) camera, provides decision regarding trajectory correction and improvement by shifting robot to a secure position. The application presented in this paper is for safe KUKA robot trajectory generation in peg-in-hole assembly process in the laboratory context. [less ▲]

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See detailAnt-Air self-learning algorithm for path planning in a cluttered environment
Ahmad, Rafiq UL; Plapper, Peter UL

in Applied Mechanics and Materials Journal (2014, December)

Path planning in unstructured area while dealing with narrow spaces is an area of research which is receiving extensive interest. Many existing algorithms are able to produce safe paths but the presented ... [more ▼]

Path planning in unstructured area while dealing with narrow spaces is an area of research which is receiving extensive interest. Many existing algorithms are able to produce safe paths but the presented concepts are either not adapted to narrow spaces or they are unable to learn from the past experience to improve repeated movements from the same agent or followed trajectories by other agents. This paper introduces an original concept based on Ant-Air phenomenon for safe path planning in a cluttered environment where narrow passages are treated. The algorithm presented is able to learn from the past experience and hence improve the already generated trajectory further by using some lessons learned from the past experience. The concept is applicable in various domains such as mobile robot path planning, manipulator trajectory generation and part movement in narrow passages in real or virtual assembly/disassembly process. [less ▲]

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See detailSafe and Automated Tool-Path Generation for Multi-Axis Production Machines
Ahmad, Rafiq UL; Plapper, Peter UL

in Transactions of the American Society of Mechanical Engineers (2014, November 14), 2B(Advanced Manufacturing), 0202034-7

Multi-axis machines are growing rapidly their precision and complexity with the increasing importance of machine intelligence, automation, optimization and safety. It is necessary to identify collision ... [more ▼]

Multi-axis machines are growing rapidly their precision and complexity with the increasing importance of machine intelligence, automation, optimization and safety. It is necessary to identify collision risks and avoid them in manufacturing otherwise production stops may cost a huge amount to the manufacturing company. This study has focused on safe trajectory generation for CNC machines especially focusing on high risked non-functional trajectories. These machines should be able to see any unwilling situation (i.e. collisions) in their vicinity and must be able to detect and react automatically in real-time for safe tool movements. Currently CAM software and some multi-axis machines are able to detect collisions but they do not have any solution to avoid such collisions automatically. The main objective is to make multi-axis machine vision system effective enough that it can see all its activities regarding collisions and can react or command automatically online as well as off-line for real and virtual productions. In presence of obstacles during manufacturing, the proposed approach will provide decisions regarding trajectory correction and improvement automatically. The proposed vision concept is able to take into account the evolution of the scene i.e. the aspects of changes to the obstacle like shape, size or presence during production. The application presented in this paper is for 2D traversal safe online trajectories generation in virtual simulated dynamic environment, which will be adapted to the real-time real machining scenarios at shop-floor by integrating it with STEP-NC technology in future. [less ▲]

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See detailPhishScore: Hacking Phishers' Minds
Marchal, Samuel UL; François, Jérôme UL; State, Radu UL et al

in Proceedings of the 10th International Conference on Network and Service Management (2014, November)

Despite the growth of prevention techniques, phishing remains an important threat since the principal countermeasures in use are still based on reactive URL blacklisting. This technique is inefficient due ... [more ▼]

Despite the growth of prevention techniques, phishing remains an important threat since the principal countermeasures in use are still based on reactive URL blacklisting. This technique is inefficient due to the short lifetime of phishing Web sites, making recent approaches relying on real-time or proactive phishing URLs detection techniques more appropriate. In this paper we introduce PhishScore, an automated real-time phishing detection system. We observed that phishing URLs usually have few relationships between the part of the URL that must be registered (upper level domain) and the remaining part of the URL (low level domain, path, query). Hence, we define this concept as intra-URL relatedness and evaluate it using features extracted from words that compose a URL based on query data from Google and Yahoo search engines. These features are then used in machine learning based classification to detect phishing URLs from a real dataset. [less ▲]

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See detailH2-Based Network Volatility Measures
Goncalves, Jorge UL; Huang, Qingqing; Yuan, Ye et al

in American Control Conference (2014, June)

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See detailComparison of ODE-based models for reactive oxygen species regulation system
Ignatenko, Andrew UL; Kolodkin, Alexey UL; Peters, Bernhard UL et al

in Proceedings of ICCSA 2014 (2014, June)

Reactive oxygen species (ROS) play important role in the functioning of any cell and especially in the lifecycle of mitochondria. Since the action of ROS can be both positive and negative then the ... [more ▼]

Reactive oxygen species (ROS) play important role in the functioning of any cell and especially in the lifecycle of mitochondria. Since the action of ROS can be both positive and negative then the remarkable role can be played by ROS regulation system. We constructed three different ODE based kinetic models of different complexity for the ROS management system and shown the difference in the dynamics of these systems under different conditions. Using results of numerical simulation we showed that extraction of some subsystems can make the model more unstable. We also introduced the objective function for comparison of the models with structure of different complexity [less ▲]

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See detailComparative study of the effect of untreated, silanized and grafted alumina nanoparticles on thermal and dynamic mechanical properties of the styrene-butadiene rubber
Sushko, Rymma UL; Baller, Jörg UL; Filimon, Marlena UL et al

in AIP Conference Proceedings (2014, May 15), 1599

Elastomers filled with hard nanoparticles are of great technical importance for the rubber industry. In general, fillers improve mechanical properties of polymer materials, e.g. elastic moduli, tensile ... [more ▼]

Elastomers filled with hard nanoparticles are of great technical importance for the rubber industry. In general, fillers improve mechanical properties of polymer materials, e.g. elastic moduli, tensile strength etc. The smaller the size of the particles the larger is the interface where interactions between polymer molecules and fillers can generate new properties. Using Temperature Modulated Differential Scanning Calorimetry (TMDSC) and Dynamic Mechanical Analysis (DMA), we investigated the properties of the pure styrene-butadiene rubber (SBR), SBR/ alumina nanoparticles, SBR/silanized alumina and SBR/alumina grafted to polymer chains. Beside a general reinforcement effect seen in the complex elastic moduli, the studies revealed that: i) small concentrations of nanoparticles (of 1.5-2 wt%) lead to a minimum in the glass transition temperature as a function of nanoparticle content; ii) for the grafted nanocomposites increasing the nanoparticle concentration beyond 4 wt% yields an increase of Tg by 4 K; iii) DMA mastercurves showed that in case of untreated and silanized alumina mechanical behaviour of the composite systems is rather near to the one of the SBR matrix, but the grafting of elastomer molecules to the silanized fillers induces a quasi-solid like response of the system in the low frequency regime. [less ▲]

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See detailRobust Primary User Identification using Compressive Sensing for Cognitive Radios
Lagunas, Eva UL; Najar, Montse

in IEEE Int. Conf. on Acoustics, Speech, and Signal Processing (ICASSP) (2014, May)

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See detailSpecific language impairment in language minority children from low-income families
Engel de Abreu, Pascale UL; Cruz-Santos, Anabela; Puglisi, Marina

in Developmental Medicine and Child Neurology (2014, May), 56(S3), 7-23

Background: This study seeks to determine whether executive functioning represents an area of difficulty for bilingual children with SLI and if so, which specific executive processes are affected. Methods ... [more ▼]

Background: This study seeks to determine whether executive functioning represents an area of difficulty for bilingual children with SLI and if so, which specific executive processes are affected. Methods: The data from 81 eight-year-olds from the following groups was analyzed: (1) 15 Portuguese-Luxembourgish bilinguals from Luxembourg with an SLI diagnosis; (2) 33 typically developing Portuguese-Luxembourgish bilinguals from Luxembourg; (3) 33 typically developing Portuguese-speaking monolinguals from Portugal. Groups were matched on first language, ethnicity, chronological age, socioeconomic status, and nonverbal intelligence. Children completed tests tapping: expressive and receptive vocabulary, syntactic comprehension, verbal and visuospatial working memory, selective attention and interference suppression. Results: The bilingual SLI group performed equally well to their typically developing peers on measures of visuospatial working memory but had lower scores than both control groups on tasks of verbal working memory. On measures of selective attention and interference suppression, typically developing children who were bilingual outperformed their monolingual counterparts. For selective attention, performance of the bilingual SLI group did not differ significantly from the controls. For interference suppression the bilingual SLI group performed significantly less well than typically developing bilinguals but not monolinguals. Discussion: The study indicates that although bilingual children with SLI do not demonstrate the same advantages in selective attention and interference suppression as typically developing bilinguals, they do not lag behind typically developing monolinguals in these domains of executive functioning. This finding raises the possibility that bilingualism might represent a protective factor against some of the cognitive limitations that are associated with SLI in monolinguals. [less ▲]

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See detailPrincipe d’intégration et pouvoir des Etats membres
Neframi, Eleftheria UL

in Revue des Affaires Européennes [= RAE] = Law & European Affairs (2014, April)

La fonction permissive du principe d'intégration permet de justifier le critère d'établissement de lien personnel en l'absence de lien économique ou malgré l'existence du lien économique. La fonction ... [more ▼]

La fonction permissive du principe d'intégration permet de justifier le critère d'établissement de lien personnel en l'absence de lien économique ou malgré l'existence du lien économique. La fonction limitative du principe d'intégration encadre la justification d'une mesure discriminatoire et couvre le rapport horizontal entre deux Etats membres en cas de dualité de rattachement. [less ▲]

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See detailBenchmarX
Anjorin, Anthony; Cunha, Alcino; Giese, Holger et al

in CEUR Workshop Proceedings (2014, March 28), 1133

Bidirectional transformation (BX) is a very active area of research interest. There is not only a growing body of theory, but also a rich set of tools supporting BX. The problem now arises that there is ... [more ▼]

Bidirectional transformation (BX) is a very active area of research interest. There is not only a growing body of theory, but also a rich set of tools supporting BX. The problem now arises that there is no commonly agreed-upon suite of tests or benchmarks that shows either the conformance of tools to theory, or the performance of tools in particular BX scenarios. This paper sets out to improve the state of affairs in this respect, by proposing a template and a set of required criteria for benchmark descriptions, as well as guide- lines for the artifacts that should be provided for each included test. As a proof of concept, the paper additionally provides a detailed description of one concrete benchmark. [less ▲]

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See detailPreparation and study of 2-D semiconductors with Dirac type bands due to the honeycomb nanogeometry
Kalesaki, Efterpi UL; Boneschanscher, M. P.; Geuchies, J. J. et al

in Proceedings of SPIE (2014, March 07), 8981

The interest in 2-dimensional systems with a honeycomb lattice and related Dirac-­type electronic bands has exceeded the prototype graphene [1]. Currently, 2-­dimensional atomic [2,3] and nanoscale [4-­8 ... [more ▼]

The interest in 2-dimensional systems with a honeycomb lattice and related Dirac-­type electronic bands has exceeded the prototype graphene [1]. Currently, 2-­dimensional atomic [2,3] and nanoscale [4-­8] systems are extensively investigated in the search for materials with novel electronic properties that can be tailored by geometry. The immediate question that arises is how to fabricate 2-­D semiconductors that have a honeycomb nanogeometry, and as a consequence of that, display a Dirac-­type band structure? Here, we show that atomically coherent honeycomb superlattices of rocksalt (PbSe, PbTe) and zincblende (CdSe, CdTe) semiconductors can be obtained by nanocrystal self-­assembly and facet-­to-­facet atomic bonding, and subsequent cation exchange. We present a extended structural analysis of atomically coherent 2-­D honeycomb structures that were recently obtained with self-assembly and facet-­to-­facet bonding [9]. We show that this process may in principle lead to three different types of honeycomb structures, one with a graphene type-­, and two others with a silicene-­type structure. Using TEM, electron diffraction, STM and GISAXS it is convincingly shown that the structures are from the silicene-­type. In the second part of this work, we describe the electronic structure of graphene-­type and silicene type honeycomb semiconductors. We present the results of advanced electronic structure calculations using the sp3d5s* atomistic tight-­binding method10. For simplicity, we focus on semiconductors with a simple and single conduction band for the native bulk semiconductor. When the 3-­D geometry is changed into 2-­D honeycomb, a conduction band structure transformation to two types of Dirac cones, one for S-­ and one for P-­orbitals, is observed. The width of the bands depends on the honeycomb period and the coupling between the nanocrystals. Furthermore, there is a dispersionless P-­orbital band, which also forms a landmark of the honeycomb structure. The effects of considerable intrinsic spin-­orbit coupling are briefly considered. For heavy-­element compounds such as CdTe, strong intrinsic spin-­‐orbit coupling opens a non-­trivial gap at the P-orbital Dirac point, leading to a quantum Spin Hall effect [10-­12]. Our work shows that well known semiconductor crystals, known for centuries, can lead to systems with entirely new electronic properties, by the simple action of nanogeometry. It can be foreseen that such structures will play a key role in future opto-­electronic applications, provided that they can be fabricated in a straightforward way. [less ▲]

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See detailCompatible systems of symplectic Galois representations and the inverse Galois problem
Arias De Reyna Dominguez, Sara UL

in Oberwolfach Reports (2014, February 05)

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See detailMOBAQ-LUX8 – Elaboration of competence-oriented test items for 8year-old luxembourgish students
Scheuer, Claude UL; Bund, Andreas UL; Becker, Werner UL

in Journal of the International Federation of Physical Education (2014, February), 83

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See detailSpatial play effects in a tangible game with an f-formation of multiple players
Jungmann, Manuela UL; Cox, Richard; Fitzpatrick, Geraldine

in Proceedings of the Fifteenth Australasian User Interface Conference (2014, January), 150

Drawing on Kendon's F-formation framework of social interaction, we analysed the game-space activity of collocated players engaged in a tangible multiplayer game. Game input from groups of 3 players ... [more ▼]

Drawing on Kendon's F-formation framework of social interaction, we analysed the game-space activity of collocated players engaged in a tangible multiplayer game. Game input from groups of 3 players interacting competitively in a natural spatial arrangement via balance-boards requiring whole-body movements was logged and analysed quantitatively. The spatial analysis of a range of players' activities in game-space revealed synergistic effects combining perceptual-motor factors with game-strategy behaviour which were reflected in preferred game-board playing regions. The findings illustrate the importance for HCI designers of considering interactions between human spatial behaviour, physical space and virtual game-space as games become increasingly embodied and social. [less ▲]

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See detailSpatial Sparsity Based Direct Positioning for IR-UWB in IEEE 802.15.4a Channels
Lagunas, Eva UL; Najar, Montse; Navarro, Monica et al

in IEEE Int. Conf. UltraWide-Band (ICUWB) (2014)

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See detailHow independent are public audit oversight systems? An interdisciplinary approach to accounting regulation. (forthcoming)
Löhlein, Lukas UL

in SIBR Conference Proceedings (2014)

The independence of audit oversight systems is the most essential prerequisite for restoring public confidence in audits after the past accounting scandals and financial crisis. Thus, over the last years ... [more ▼]

The independence of audit oversight systems is the most essential prerequisite for restoring public confidence in audits after the past accounting scandals and financial crisis. Thus, over the last years, the European Union passed various provisions to strengthen the independence of European oversight systems. However, a systematic and encompassing comparison of the reform outcomes across the European Member States is still missing. This study is the first that provides insights into the question as to how independent the “independent” audit oversight boards are. Their independence is measured both in terms of their institutional composition (e.g. appointment procedures of the board members) and regulatory competencies (e.g. the way audit firms are inspected). The results are visualized by a Partial Order Scalogram Analysis (POSAC), which allows conclusions about the similarities of various countries and their relative levels of independence. Both measurements are then equally combined into one value of material independence and to a rank order of all European oversight systems and the U.S. PCAOB is set up. The study shows that, while the oversight of financial reporting is conducted by securities regulators in most European Member States, the field of auditing still has a long way to go to achieve regulatory harmonization. The analysis reveals considerable diversity with regard to the way the various European oversight systems are organized and operate. While countries such as Luxembourg, Italy, Latvia and the UK possess relatively independent oversight systems, the systems of Ireland, Portugal and Slovakia show low levels of independence. Since the different systems are strongly interrelated with the accounting profession, I point out that these countries have focused on creating “independent” oversight entities rather than on implementing truly independent regulation. The paper also questions the role of the PCAOB as regulatory “benchmark”: Although the PCAOB shows the most independent values in terms of regulatory competencies, the institutional independence of the PCAOB from the accounting profession seems to be less strong than the literature suggests. [less ▲]

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See detailSecurity@Runtime: A flexible MDE approach to enforce fine-grained security policies
Elrakaiby, Yehia UL; Amrani, Moussa UL; Le Traon, Yves UL

in Lecture Notes in Computer Science (2014), 8364 LNCS

In this paper, we present a policy-based approach for automating the integration of security mechanisms into Java-based business applications. In particular, we introduce an expressive Domain Specific ... [more ▼]

In this paper, we present a policy-based approach for automating the integration of security mechanisms into Java-based business applications. In particular, we introduce an expressive Domain Specific modeling Language (Dsl), called Security@Runtime, for the specification of security configurations of targeted systems. The Security@Runtime Dsl supports the expression of authorization, obligation and reaction policies, covering many of the security requirements of modern applications. Security requirements specified in security configurations are enforced using an application-independent Policy Enforcement Point Pep)-Policy Decision Point (Pdp) architecture, which enables the runtime update of security requirements. Our work is evaluated using two systems and its advantages and limitations are discussed. © 2014 Springer International Publishing Switzerland. [less ▲]

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See detailThe extended discrete element method (XDEM) applied to drying of a packed bed
Peters, Bernhard UL; Besseron, Xavier UL; Estupinan Donoso, Alvaro Antonio UL et al

in Industrial Combustion (2014), 14

A vast number of engineering applications involve physics not solely of a single domain but of several physical phenomena, and therefore are referred to as multi-physical. As long as the phenomena ... [more ▼]

A vast number of engineering applications involve physics not solely of a single domain but of several physical phenomena, and therefore are referred to as multi-physical. As long as the phenomena considered are to be treated by either a continuous (i.e. Eulerian) or discrete (i.e. Lagrangian) approach, numerical solution methods may be employed to solve the problem. However, numerous challenges in engineering exist and evolve; those include modelling a continuous and discrete phase simultaneously, which cannot be solved accurately by continuous or discrete approaches only. Problems that involve both a continuous and a discrete phase are important in applications as diverse as the pharmaceutical industry, the food processing industry, mining, construction, agricultural machinery, metals manufacturing, energy production and systems biology. A novel technique referred to as Extended Discrete Element Method (XDEM) has been developed that offers a significant advancement for coupled discrete and continuous numerical simulation concepts. XDEM extends the dynamics of granular materials or particles as described through the classical discrete element method (DEM) to include additional properties such as the thermodynamic state or stress/strain for each particle coupled to a continuous phase such as a fluid flow or a solid structure. Contrary to a continuum mechanics concept, XDEM aims at resolving the particulate phase through the various processes attached to particles. While DEM predicts the spatial-temporal position and orientation for each particle, XDEM additionally estimates properties such as the internal temperature and/or species distribution during drying, pyrolysis or combustion of solid fuel material such as biomass in a packed bed. These predictive capabilities are further extended by an interaction with fluid flow by heat, mass and momentum transfer and the impact of particles on structures. © International Flame Research Foundation, 2014. [less ▲]

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See detailDistribution Grid Monitoring through Pilot Injection and Successive Interference Cancellation
Neshvad, Surena UL; Chatzinotas, Symeon UL; Sachau, Jürgen UL

in Proceedings of IAEE Conference (2014)

Due to the push for renewable energy in the last decades, European countries have witnessed an exponential growth of Distributed Generation (DG) on the Medium Voltage (MV) network. An increasingly large ... [more ▼]

Due to the push for renewable energy in the last decades, European countries have witnessed an exponential growth of Distributed Generation (DG) on the Medium Voltage (MV) network. An increasingly large portion of the electricity demand is fed in through the distribution grid, whose good health and operational status will be important for guaranteeing grid stability. In Luxembourg, the distribution network is sparsely monitored and controlled, thus instabilities arising due to line overvoltage or DG malfunctioning are not rapidly detected and resolved. This research discusses a novel and low infrastructure methodology for online monitoring of the distribution grid. Such a tool will be increasingly necessary in order to guarantee the stability, reliability and security of the power network, as a larger and larger portion of the energy demand will be satisfied by DG in future years. In this research, advanced system identification techniques utilized in communications, such as Pseudo-Random Binary Sequences, Successive Interference Cancellation are applied to estimate the transfer function of power network propagation paths. The developed method proposes an online monitoring tool that computes grid parameters in real time during operation, without extensive infrastructure addition, by utilizing the PWM based inverters on the grid for active system identification. [less ▲]

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See detailA Conceptual Framework to Study Socio-Technical Security
Ferreira, Ana UL; Huynen, Jean-Louis UL; Koenig, Vincent UL et al

in Lecture Notes in Computer Science (2014)

We propose an operational framework for a social, technical and contextual analysis of security. The framework provides guidelines about how to model a system as a layered set of interacting elements, and ... [more ▼]

We propose an operational framework for a social, technical and contextual analysis of security. The framework provides guidelines about how to model a system as a layered set of interacting elements, and proposes two methodologies to analyse technical and social vulnerabilities. We show how to apply the framework in a use case scenario. [less ▲]

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See detailA Survey on Stability and Rigidity Results for Lie algebras
Crainic, Marius; Struchiner, Ivan; Schatz, Florian UL

in Indagationes Mathematicae (2014), 25(5), 957-976

We give simple and unified proofs of the known stability and rigidity results for Lie algebras, Lie subalgebras and Lie algebra homomorphisms. Moreover, we investigate when a Lie algebra homomorphism is ... [more ▼]

We give simple and unified proofs of the known stability and rigidity results for Lie algebras, Lie subalgebras and Lie algebra homomorphisms. Moreover, we investigate when a Lie algebra homomorphism is stable under all automorphisms of the codomain (including outer automorphisms). [less ▲]

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See detailDining Cryptographers with 0.924 Verifiable Collision Resolution
Franck, Christian UL

in Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica (2014), 14(1), 49-59

The dining cryptographers protocol implements a multiple access channel in which senders and recipients are anonymous. A problem is that a malicious participant can disrupt communication by deliberately ... [more ▼]

The dining cryptographers protocol implements a multiple access channel in which senders and recipients are anonymous. A problem is that a malicious participant can disrupt communication by deliberately creating collisions. We propose a computationally secure dining cryptographers protocol with collision resolution that achieves a maximum stable throughput of 0.924 messages per round and which allows to easily detect disruptors. [less ▲]

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See detailSocio-technical Security Analysis of Wireless Hotspots
Ferreira, Ana UL; Huynen, Jean-Louis UL; Koenig, Vincent UL et al

in Lecture Notes in Computer Science (2014)

We present a socio-technical analysis of security of Hotspot and Hotspot 2.0. The analysis focuses is user-centric, and aim at understanding which user action can compromise security in presence of a ... [more ▼]

We present a socio-technical analysis of security of Hotspot and Hotspot 2.0. The analysis focuses is user-centric, and aim at understanding which user action can compromise security in presence of a attacker. We identify research questions about possible factors that may affect user’s security decisions, and propose experiments to answer them. [less ▲]

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See detailThe frequency of acute medication intake relates to its perceived effectiveness in chronic headache patients
Van Ryckeghem, Dimitri UL; Wens, T.; Paemeleire, K. et al

in Journal of Headache and Pain (2014), 15(1),

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See detailOn complex analytic 1|3-dimensional supermanifolds associated with CP^1
Vishnyakova, Elizaveta UL

in Proceedings of the XXXII Workshop on Geometric Methods in Physics (2014)

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See detailSocioeconomic inequalities in fatal opiate and cocaine related overdoses: Transgenerational baggage versus individual attainments
Origer, Alain UL; Bucki, Barbara UL; Baumann, Michèle UL

in European Health Psychologist (2014)

Background. To determine socioeconomic inequalities in opiates and cocaine related Fatal OverDose (FOD) cases and their implications in terms of preventive measures. Methods. Cross-examination of law ... [more ▼]

Background. To determine socioeconomic inequalities in opiates and cocaine related Fatal OverDose (FOD) cases and their implications in terms of preventive measures. Methods. Cross-examination of law enforcement and healthcare data sources and of forensic evidence in a nested case-control study design. FOD cases were individually matched with 4 controls, according to sex, year of birth, drug administration route and duration of drug use. 272 cases vs. 1,056 controls were compared through conditional logistic regression. Findings. Being professionally active [OR=0.662 (95% CI 0.446–0.985)], reporting salary as main income source [OR=0.417 (95% CI 0.258–0.674)], and education attainment higher than primary school [OR=0.501 (95% CI 0.344-0.729)] revealed to be protective factors, whereas parental professional status was not associated to FOD. Discussion. Compared to their peers, drug users with lower socioeconomic profiles show increased odds of FOD. However, actual and self-referred socioeconomic characteristics of drug users, impacting on daily life quality, such as educational attainment, employment and revenue, appeared to be more predictive of FOD than transgenerational factors such as the parental socioeconomic status. Thus, motivational interventions aimed at socio-professional reintegration should be given due attention in dedicated harm prevention policies. [less ▲]

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See detailSemiconductors for Photovoltaic Devices: Electrochemical Approaches using Ionic Liquids
Dale, Phillip UL; Malaquias, Joao Corujo Branco UL; Steichen, Marc UL

in ECS Transactions (2014), 58(18), 1-12

Can electrodeposition be used to create high quality p-type inorganic compound semiconductors for photovoltaic applications? Thin film photovoltaic devices offer similar power conversion efficiencies to ... [more ▼]

Can electrodeposition be used to create high quality p-type inorganic compound semiconductors for photovoltaic applications? Thin film photovoltaic devices offer similar power conversion efficiencies to polycrystalline silicon devices and have the inherent advantages of consisting of less material and requiring less energy expenditure during processing. Thin film devices consist of a semiconductor pn heterojunction with front and back contacts to extract the excited charge carriers. The materials properties of the p-type layer are the most stringent, and determine the overall performance of the device. Common p-type semiconductors are CdTe, Cu(In,Ga)Se2, and Cu2ZnSn(S,Se)4. Typically the p-type semiconductor must form a continuous dense single phase layer two micron thick over metre squared areas. Most commercial producers of thin film photovoltaic modules choose evaporation or sputtering methods to deposit this layer. Of importance is the speed, cost, and quality of deposition. Electrodeposition offers the ability to deposit thin films over large areas with high materials usage, potentially at high speed. Can electrodeposition be used to create high quality p-type inorganic compound semiconductors? This talk will show that it is possible to directly deposit a working p-type semiconductor, but that a two step approach of depositing metals and then annealing them in a reactive atmosphere is a simpler, easier, and more robust approach. Both approaches can lead to semiconductors which provide working photovoltaic devices. However, improvements to the electrodepostion process are still required and the main challenges are outlined below. Challenges in directly electrodepositing a p-type semiconductor are (i) the inherent lack of electrons necessary for a reductive deposition process and (ii) the low thermal energy available at normal deposition temperatures to create micron sized well ordered crystals. Challenges for directly electrodepositing the metal alloys CuInGa or CuSnZn from aqueous solution are (iii) competition with hydrogen reduction leading to inefficient deposition, embrittlement, and dendritic growth (iv) control of the alloy composition over the micrometer and centimeter length scales due to the different reduction potentials, nucleation densities, and diffusion coefficients. In this talk it will be shown how these challenges can be met by using ionic liquids to replace aqueous solvents. Ionic liquids offer larger electrochemical windows, higher processing temperatures, and the choice of new forms of starting reagent. Furthermore, task specific ionic liquids or liquid metal salts, may even be employed to allow extremely high speed deposition. [less ▲]

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See detailCoverage-based Test Cases Selection for XACML Policies
Bertolino, Antonia; Le Traon, Yves UL; Lonetti, Francesca et al

in IEEE International Conference on Software Testing Verification and Validation Workshops (2014)

XACML is the de facto standard for implementing access control policies. Testing the correctness of policies is a critical task. The test of XACML policies involves running requests and checking manually ... [more ▼]

XACML is the de facto standard for implementing access control policies. Testing the correctness of policies is a critical task. The test of XACML policies involves running requests and checking manually the correct response. It is therefore important to reduce the manual test effort by automatically selecting the most important requests to be tested. This paper introduces the XACML smart coverage selection approach, based on a proposed XACML policy coverage criterion. The approach is evaluated using mutation analysis and is compared on the one side with a not-reduced test suite, on the other with random and greedy optimal test selection approaches. We performed the evaluation on a set of six real world policies. The results show that our selection approach can reach good mutation scores, while significantly reducing the number of tests to be run. [less ▲]

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See detail""Au début, il n'y a rien" : L'origine du roman chez Queneau et Perec"
Raus, Tonia UL

in Cahiers Raymond Queneau (2014), 4

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See detailLocal solutions of the generalized Dhombres functional equation in a neighbourhood of infinity
Tomaschek, Jörg UL; Reich, Ludwig

in ESAIM: Proceedings and Surveys (2014), 46

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See detailIsogeometric finite element analysis using polynomial splines over hierarchical T-meshes
Nguyen-Thanh, Nhon; Nguyen-Xuan, Hung; Bordas, Stéphane UL et al

in IOP Conference Series: Materials Science and Engineering (2014), 10(1),

Isogeometric finite element analysis has become a powerful alternative to standard finite elements due to their flexibility in handling complex geometries. One major drawback of NURBS based isogeometric ... [more ▼]

Isogeometric finite element analysis has become a powerful alternative to standard finite elements due to their flexibility in handling complex geometries. One major drawback of NURBS based isogeometric finite elements is their less effectiveness of local refinement. In this study, we present an alternative to NURBS based isogeometric finite elements that allow for local refinement. The idea is based on polynomial splines and exploits the flexibility of T-meshes for local refinement. The shape functions satisfy important properties such as non-negativity, local support and partition of unity. We will demonstrate the efficiency of the proposed method by two numerical examples. [less ▲]

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See detailA Toolchain for Model-Based Design and Testing of Access Control Systems
Daoudagh, Said; El Kateb, Donia UL; Lonetti, Francesca et al

in MODELSWARD (2014)

In access control systems, aimed at regulating the accesses to protected data and resources, a critical component is the Policy Decision Point (PDP), which grants or denies the access according to the ... [more ▼]

In access control systems, aimed at regulating the accesses to protected data and resources, a critical component is the Policy Decision Point (PDP), which grants or denies the access according to the defined policies. Due to the complexity of the standard language, it is recommended to rely on model-driven approaches which allow to overcome difficulties in the XACML policy definition. We provide in this paper a toolchain that involves a model-driven approach to specify and generate XACML policies and also enables automated testing of the PDP component. We use XACML-based testing strategies for generating appropriate test cases which are able to validate the functional aspects, constraints, permissions and prohibitions of the PDP. An experimental assessment of the toolchain and its use on a realistic case study are also presented. [less ▲]

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See detailEditorial: The Best Practice Principles for Proxy Advisor
Zetzsche, Dirk Andreas UL

in Ethical Boardroom (2014)

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See detailSocial Interaction Based Audience Segregation for Online Social Networks.
van der Torre, Leon UL; Ahmed, Javed; Governatori, Guido et al

in Proceedings of the European Conference on Social Intelligence (2014)

Online social networking is the latest craze that has captured the attention of masses, people use these sites to communicate with their friends and family. These sites o er attractive means of social ... [more ▼]

Online social networking is the latest craze that has captured the attention of masses, people use these sites to communicate with their friends and family. These sites o er attractive means of social interac- tions and communications, but also raise privacy concerns. This paper examines user's abilities to control access to their personal information posted in online social networks. Online social networks lack common mechanism used by individuals in their real life to manage their privacy. The lack of such mechanism signi cantly a ects the level of user control over their self presentation in online social networks. In this paper, we present social interaction based audience segregation model for online so- cial networks. This model mimics real life interaction patterns and makes online social networks more privacy friendly. Our model uses type, fre- quency, and initiation factor of social interactions to calculate friendship strength. The main contribution of the model is that it considers set of all possible interactions among friends and assigns a numerical weight to each type of interaction in order to increase or decrease its contribu- tion in calculation of friendship strength based on its importance in the development of relationship ties. [less ▲]

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See detailIs Adult Education and Training Policy (1999-2011) in Portugal based on a Dilemma? The Critical Construction of the Employable Learner
Guimarães, Paula; Alves, Natália; Cavaco, Carmen et al

in Procedia Social and Behavioral Sciences (2014)

The concepts of competences and employability have been oftenly used in educational policy discourses. They have been based on a category, the employable learner both in the European Union and Portugal ... [more ▼]

The concepts of competences and employability have been oftenly used in educational policy discourses. They have been based on a category, the employable learner both in the European Union and Portugal. This paper set out to discuss how is the adult learner constructed within adult education and training policy, that is, under two programmes launched since 1999 in Portugal within the European Union's lifelong learning guidelines. A qualitative and interpretative approach was preferred for this paper. Two national policy discourses were subjected to content analysis. The conclusions state an ambiguous understanding of the employable learner. [less ▲]

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See detailFamily caregivers’ health capability: Contribution of, and relations between its dimensions
Bucki, Barbara UL; Baumann, Michèle UL

in European Health Psychologist (2014)

Background. Being family caregiver poses certain risks for physical, mental and social health. The health capability paradigm (Ruger, 2010) explores the capacity to achieve one’s optimal health. Family ... [more ▼]

Background. Being family caregiver poses certain risks for physical, mental and social health. The health capability paradigm (Ruger, 2010) explores the capacity to achieve one’s optimal health. Family caregivers’ health capability partly consists of 8 dimensions: physical and psychological functioning, lifestyle value, self-efficacy, family support, social capital, socio-economic conditions and access to health services. Which relations exist between these dimensions, and which ones contribute the most to health capability? Methods. Home-based structured interviews were led among 62 family caregivers living in Luxembourg 2 years after their relatives’ stroke. Twenty items measured the 8 dimensions of health capability. Using a Bayesian approach, a structural equation modelling was applied. Findings. Socio-economic conditions were positively correlated with all the other dimensions. Family caregivers’ fatigue and feeling abandoned by their families impeded their health capability the most. Discussion. Enhancing family caregivers’ well-being involves finding interventions relieving them physically and fostering family networking around the ill, giving priority to the socially disadvantaged. [less ▲]

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See detailAn ASPIC-based legal argumentation framework for deontic reasoning
van der Torre, Leon UL; Villata, Serena

in Computational Models of Argument (2014)

In the last years, argumentation theory has been exploited to reason about norms, argue about enforced obligations and permissions, and establish the validity of norms seen as argumentative claims. In ... [more ▼]

In the last years, argumentation theory has been exploited to reason about norms, argue about enforced obligations and permissions, and establish the validity of norms seen as argumentative claims. In this paper, we start from the dynamic legal argumentation framework recently proposed by Prakken and Sartor, and we extend their ASPIC-based system by introducing deontic modalities, to include also normative concepts like factual and deontic detachment, and normative dynamics. Properties of the original and proposed legal argumentation system are presented and discussed, and related to deontic logic and logics of normative systems. [less ▲]

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See detail“School Means Nothing to me”. Vocationalism and School Disaffiliation in Education and Training Courses in Portugal
Alves, Natália; Guimarães, Paula; Marques, Marcelo UL et al

in Procedia Social and Behavioral Sciences (2014)

Education and Training Courses for young people have assumed great relevance in the Portuguese education system. Aimed at fighting school failure and dropout these courses fall within the compensatory ... [more ▼]

Education and Training Courses for young people have assumed great relevance in the Portuguese education system. Aimed at fighting school failure and dropout these courses fall within the compensatory education framework policies. Based on interviews, an analysis of the students attending Education and Training Courses, school pathways, experiences and representations on how this form of provision was achieved. Data collected pointed to a general feeling of disaffiliation towards school, seen as a necessary evil, as well as the understanding of Education and Training Courses as the last chance to conclude the 9 th year of basic education. [less ▲]

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See detailPOD-based model order reduction for the simulation of strong nonlinear evolutions in structures: Application to damage propagation
Kerfriden, P.; Gosselet, P.; Adhikari, S. et al

in IOP Conference Series: Materials Science and Engineering (2014), 10(1),

In this paper, we develop a bridge between POD-based model order reduction techniques and the classical Newton-Krylov solvers to derive an efficient solution procedure for highly nonlinear problems ... [more ▼]

In this paper, we develop a bridge between POD-based model order reduction techniques and the classical Newton-Krylov solvers to derive an efficient solution procedure for highly nonlinear problems undergoing strong topological changes. [less ▲]

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See detailBreaking bad news in different medical conditions : exploring the physicians and patients perspectives
Muller, Laurent; Kretsch, Marina; Hannachi, Nawel et al

in European Health Psychologist (2014)

Background: We aim to explore factors influencing the breaking bad news process in different medical contexts with irreversible conditions (others than cancer). Methods: 23 patients and 18 physicians ... [more ▼]

Background: We aim to explore factors influencing the breaking bad news process in different medical contexts with irreversible conditions (others than cancer). Methods: 23 patients and 18 physicians concerned by different chronic diseases were interviewed by psychologists. They received/broke bad news in the few months preceding the interview. Findings: Thematic analysis of interviews allowed to identify higher-order themes, and more specific themes for both, patients and physicians. The main topics covered by physicians concerned the determinants of the strategies to communicate with patients, the encountered difficulties, the initial training, the information, interpersonal relationships, emotional reactions, perception of its role, the specifics of the disease. The discourse of patients referred to three stages including specifics topics: the communication of bad news, the health care pathways, and the life with disease. Discussion: Data analysis highlight importance of patient and physician’s profiles, and specifics of disease, in the breaking bad news process. Recommendations to build tailored intervention for physicians by using formative self-assessment will be exposed. [less ▲]

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See detailBuilding the social graph of the history of European integration: A pipeline for humanist-machine interaction in the digital humanities
Wieneke, Lars UL; Düring, M.; Silaume, G. et al

in Lecture Notes in Computer Science (2014), 8359 LNCS

The breadth and scale of multimedia archives provides a tremendous potential for historical research that hasn't been fully tapped up to know. In this paper we want to discuss the approach taken by the ... [more ▼]

The breadth and scale of multimedia archives provides a tremendous potential for historical research that hasn't been fully tapped up to know. In this paper we want to discuss the approach taken by the History of Europe application, a demonstrator for the integration of human and machine computation that combines the power of face recognition technology with two distinctively different crowd-sourcing approaches to compute co-occurrences of persons in historical image sets. These co-occurrences are turned into a social graph that connects persons with each other and positions them, through information about the date and location of recording, in time and space. The resulting visualization of the graph as well as analytical tools can help historians to find new impulses for research and to un-earth previously unknown relationships. As such the integration of human expertise and machine computation enables a new class of applications for the exploration of multimedia archives with significant potential for the digital humanities. © 2014 Springer-Verlag. [less ▲]

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See detailOrientare l'analisi. Una semiotica critica e materiale è possibile?
Treleani, Matteo UL

in STS Italia (2014)

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See detailApplying modular Galois representations to the Inverse Galois Problem
Wiese, Gabor UL

in Oberwolfach Reports (2014), 11(1), 305-309

For many finite groups, the Inverse Galois Problem can be approached through modular/automorphic Galois representations. This is a report explaining the basic strategy, ideas and methods behind some ... [more ▼]

For many finite groups, the Inverse Galois Problem can be approached through modular/automorphic Galois representations. This is a report explaining the basic strategy, ideas and methods behind some recent results. It focusses mostly on the 2-dimensional case and underlines in particular the importance of understanding coefficient fields. [less ▲]

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See detailFinite-time road grade computation for a vehicle platoon
Yang, Tao; Yuan, Ye; Li, Kezhi et al

in IEEE (2014)

Given a platoon of vehicles traveling uphill, this paper considers the finite-time road grade computation problem. We propose a decentralized algorithm for an arbitrarily chosen vehicle to compute the ... [more ▼]

Given a platoon of vehicles traveling uphill, this paper considers the finite-time road grade computation problem. We propose a decentralized algorithm for an arbitrarily chosen vehicle to compute the road grade in a finite number of time-steps by using only its own successive velocity measurements. Simulations then illustrate the theoretical results. These new results can be applied to real-world vehicle platooning problems to reduce fuel consumption and carbon dioxide emissions. [less ▲]

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