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See detailThe influence of the Design Task Description on the course and outcome of idea generation meetings
Gericke, Kilian UL; Schmidt-Kretschmer, Michael; Blessing, Lucienne UL

in McDonnell, Janet; Lloyd, Peter (Eds.) About: Designing - Analysing Design Meetings (2009)

This paper presents the results of an explorative, comparative protocol analysis of two design meetings that focused on identifying how the style of the Design Task Description influences the course and ... [more ▼]

This paper presents the results of an explorative, comparative protocol analysis of two design meetings that focused on identifying how the style of the Design Task Description influences the course and the outcome of an idea generation meeting. A framework is used to allocate potential influencing factors, including the DTD, and to discuss the various relationships and influences in order to understand the differences in course and outcome of the meetings. The style of the DTD was found to influence the length of the analysis phase and lead to differences in the course of the two idea generation meetings and to a higher idea generation rate. [less ▲]

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See detailInfluence of the microstructure on the stress state of solder joints dusing thermal cycling
Menk, A.; Bordas, Stéphane UL

in Proceedings of 10th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2009 (2009)

The lifetime of a solder joint is mainly determined by its creep behaviour. Creep arises from the stresses inside the solder joints as a consequence of the thermomechanical mismatch of the board and the ... [more ▼]

The lifetime of a solder joint is mainly determined by its creep behaviour. Creep arises from the stresses inside the solder joints as a consequence of the thermomechanical mismatch of the board and the substrate. The stress state is heavily influenced by the anisotropy of tin. To understand the damage process in solder joints, the influence of the anisotropic microstructure must be understood. In this paper the influence of different grain sizes, shapes and orientations on the stress state is evaluated, based on numerical experiments. [less ▲]

Detailed reference viewed: 37 (2 UL)
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See detailInsider Threats to Information Security, Digital Espionage, and Counter-Intelligence
You, Ilsun; Lenzini, Gabriele UL; De Santis, Alfredo

in IEEE Systems Journal (2017), 11(2),

Detailed reference viewed: 99 (19 UL)
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See detailAn integrated approach to adaptive anticipatory traffic control and parameter estimation
Huang, Wei; Tampere, Chris M.J.; Viti, Francesco UL

in Proceedings of the MT-ITS Conference (2015, June)

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See detailAn integrated approach to apdative anticipatory traffic control and parameter estimation
Huang, Wei; Tampere, Chris M.J.; Viti, Francesco UL

in Proceedings of the MT-ITS Conference (2015, June)

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See detailAn integrated design-analysis framework for three dimensional composite panels
Nguyen, Vinh-Phu; Kerfriden, Pierre; Bordas, Stéphane UL et al

in Computer-Aided Design (2014)

We present an integrated design-analysis framework for three dimensional composite panels. The main components of the proposed framework consist of (1) a new curve/surface offset algorithm and (2) the ... [more ▼]

We present an integrated design-analysis framework for three dimensional composite panels. The main components of the proposed framework consist of (1) a new curve/surface offset algorithm and (2) the isogeometric concept recently emerged in the computational mechanics community. Using the presented approach, finite element analysis of composite panels can be performed with the only input is the geometry representation of the composite surface. In this paper, non-uniform rational B-splines (NURBS) are used to represent the panel surfaces. A stress analysis of curved composite panel with stiffeners is provided to demonstrate the proposed framework. [less ▲]

Detailed reference viewed: 276 (6 UL)
See detailDer Integrated Function Modelling (IFM) Framework
Eisenbart, Boris UL; Gericke, Kilian UL; Blessing, Lucienne UL

Article for general public (2013)

Detailed reference viewed: 89 (5 UL)
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See detailAn Integrated Perspective on Traffic Management and Logistic Optimization
Amaral, R. R.; Aghezzaf, E.-H.; Rinaldi, Marco UL et al

in Proceedings of the 18th IEEE International Conference on Intelligent Transportation Systems, ITSC 2015 (2015)

Traffic Management and Logistic Optimization have been extensively studied as two separate classes of problems, for which numerous methodologies, mathematical models and algorithmic solutions were made ... [more ▼]

Traffic Management and Logistic Optimization have been extensively studied as two separate classes of problems, for which numerous methodologies, mathematical models and algorithmic solutions were made available in literature. However, little attention has been devoted to the interactions between the variables involved in these problems and the consequences of the decision making processes carried independently by Traffic Managers and Logistic Players. We believe this to be of considerable importance, since partial or incomplete knowledge on one another's decisions might yield sub-optimality for either or both of them. In this work, we propose an integrated view on both classes of problems, providing mathematical formulations to support the assessment of the impact which the two players may have on each other. © 2015 IEEE. [less ▲]

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See detailIntegrating Different Functional Modeling Perspectives
Eisenbart, Boris UL; Qureshi, Ahmed Jawad UL; Gericke, Kilian UL et al

in Charkrabarti, Amaresh; Prakash, Raghu (Eds.) ICoRD'13, Global Product Development (2013)

The paper proposes a modular functional modeling framework, which aims at integrating the different functional modeling perspectives, relevant to different disciplines. The results of two extensive ... [more ▼]

The paper proposes a modular functional modeling framework, which aims at integrating the different functional modeling perspectives, relevant to different disciplines. The results of two extensive literature studies on diverse functional modeling approaches proposed in a variety of disciplines are consolidated. These studies identified specific needs for an integrated functional modeling approach to support interdisciplinary conceptual design. The presented framework aims at fulfilling these needs. It consists of a variety of associated views, represented through different matrices. This matrix-based representation facilitates the analysis of different functional modeling perspectives and their interdependencies. Finally, the implications of the presented approach are discussed. [less ▲]

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See detailIntegrating strong and weak discontinuities without integration subcells and example applications in an XFEM/GFEM framework
Natarajan, S.; Roy Mahapatra, D.; Bordas, Stéphane UL

in International Journal for Numerical Methods in Engineering (2010), 83(3), 269-294

Partition of unity methods, such as the extended finite element method, allows discontinuities to be simulated independently of the mesh (Int. J. Numer. Meth. Engng. 1999; 45:601-620). This eliminates the ... [more ▼]

Partition of unity methods, such as the extended finite element method, allows discontinuities to be simulated independently of the mesh (Int. J. Numer. Meth. Engng. 1999; 45:601-620). This eliminates the need for the mesh to be aligned with the discontinuity or cumbersome re-meshing, as the discontinuity evolves. However, to compute the stiffness matrix of the elements intersected by the discontinuity, a subdivision of the elements into quadrature subcells aligned with the discontinuity is commonly adopted. In this paper, we use a simple integration technique, proposed for polygonal domains (Int. J. Numer. Meth. Engng 2009; 80(1):103-134. DOI: 10.1002/nme.2589) to suppress the need for element subdivision. Numerical results presented for a few benchmark problems in the context of linear elastic fracture mechanics and a multi-material problem show that the proposed method yields accurate results. Owing to its simplicity, the proposed integration technique can be easily integrated in any existing code. © 2010 John Wiley & Sons, Ltd. [less ▲]

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See detailInteractions between residential and daily mobility: Luxembourg case study in the MOEBIUS project (extended abstract)
Gerber, Philippe; Caruso, Geoffrey UL; Cornélis, Eric et al

in Hesse, Markus; Caruso, Geoffrey; Gerber, Philippe (Eds.) et al Proceedings of the BIVEC-GIBET Transport Research Days 2013 (2013)

We present the modelling strategy of the research project MOEBIUS, which aims at simulating future urbanisation and commuting mobility, including modal split, under various planning conditions. MOEBIUS is ... [more ▼]

We present the modelling strategy of the research project MOEBIUS, which aims at simulating future urbanisation and commuting mobility, including modal split, under various planning conditions. MOEBIUS is similar in its objectives to a Land Use and Transport Interaction (LUTI) model, although very modular in its implementation and with ability to deal with very fine spatial resolution inputs and outputs. We simulate (i) the future potential urbanisation in Luxembourg, (ii) the population and its spatial distribution, and (iii) the daily mobility (commuting pattern and travel mode choice) at a disaggregated level. [less ▲]

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See detailInteraktive Transitionsforschung und Wissensgenerierung im Bereich nachhaltiges Bauen
JUNG ép. PRELLER, Bérénice UL; Affolderbach, Julia UL; Schulz, Christian UL et al

in PND online (2014), 2014(2), 1-14

Basierend auf den Erfahrungen eines internationalen Forschungsprojekts zu den institutionellen Rahmenbedingungen für Innovativität im nachhaltigen Bauen illustriert der Beitrag das Potenzial interaktiver ... [more ▼]

Basierend auf den Erfahrungen eines internationalen Forschungsprojekts zu den institutionellen Rahmenbedingungen für Innovativität im nachhaltigen Bauen illustriert der Beitrag das Potenzial interaktiver Methoden für die Produktion von »Transitionswissen«. Die frühe Einbindung von lokalen Praktikern, Unternehmern, Wissenschaftlern, politischen Entscheidungsträgern und Vertretern von Nichtregierungsorganisationen dient dabei nicht nur den Forschenden zur Exploration des jeweiligen Forschungskontexts, sondern schafft eine Plattform für produktiven Austausch von Wissen. Methodisch unterstützt durch interaktive Workshops sowie Delphi-basierte Feedback- und Validierungsrunden entsteht über die Projektlaufzeit ein wechselseitiger Lernprozess, der zusätzlich durch den Austausch von Erfahrungen aus vier Fallstudienregionen in Europa, Australien und Kanada inspiriert wird. Er liefert für alle Beteiligten wichtige Erkenntnisse über die Gestaltbarkeit von nachhaltigkeitsorientierten Transitionsprozessen im Baubereich. [less ▲]

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See detailInterdisciplinary Ignorance
Kemman, Max UL

Scientific Conference (2017)

Detailed reference viewed: 59 (9 UL)
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See detailAn Interdisciplinary Methodology to Validate Formal Representations of Legal Text Applied to the GDPR
Bartolini, Cesare UL; Lenzini, Gabriele UL; Santos, Cristiana

Scientific Conference (2018, November 12)

The modelling of a legal text into a machine-processable form, such as a list of logic formulæ, enables a semi-automatic reasoning about legal compliance but might entail some anticipation of legal ... [more ▼]

The modelling of a legal text into a machine-processable form, such as a list of logic formulæ, enables a semi-automatic reasoning about legal compliance but might entail some anticipation of legal interpretation in the modelling. The formulæ need therefore to be validated by legal experts, but it is unlikely that they are familiar with the formalism used. This calls for an interdisciplinary validation methodology to ensure that the model is legally coherent with the text it aims to represent but that could also close the communication gap between formal modellers and legal evaluators. This paper discusses such a methodology, providing an human-readable representation that preserves the formulæ's meaning but that presents them in a way that is usable by non-experts. We exemplify the methodology on a use case where Articles of the GDPR are translated in the Reified I/O logic encoded in LegalRuleML. [less ▲]

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See detailInterfence mitigation and synchronization for satellite communications
Grotz, Joel UL

Doctoral thesis (2008)

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See detailInterference Mitigation and Synchronization for Satellite Communications
Grotz, Joel UL

Book published by KTH (2008)

Within this thesis, the satellite broadcast scenario of geostationary satellites is reviewed. The densely crowded geostationary arc in the common broadcast frequencies may create significant interference ... [more ▼]

Within this thesis, the satellite broadcast scenario of geostationary satellites is reviewed. The densely crowded geostationary arc in the common broadcast frequencies may create significant interference from adjacent satellites (ASI). The possible use of multiple-input receivers and of interference processing techniques is analyzed in this specific context. In addition the synchronization problem is studied under interference limited conditions for broadcast as well as broadband satellite systems.We address fixed satellite broadcast reception with the goal of decreasing the aperture of the receiving antenna. The front-end antenna size is commonly defined by the presence of interference from adjacent satellites. A small antenna aperture leads to interference from neighboring satellites utilizing the same frequency bands. We propose a multi-input reception system with subsequent joint detection which provides reliable communication in the presence of multiple interfering signals. An iterative least square technique is adopted combining spatial and temporal processing. This approach achieves robustness against pointing errors and against changing interference scenarios. Different temporal interference processing methods are evaluated, including Minimum Mean Square Error (MMSE) based iterative soft-decision interference cancellation as well as Iterative Least Square with Projection (ILSP) based approaches, which include spatial and temporal iterations. Furthermore the potential of an additional convolutional channel decoding step in the interference cancellation mechanism is verified.Also, we demonstrate how to accurately synchronize the signals as part of the detection procedure. The technique is evaluated in a realistic simulation study representing the conditions encountered in typical broadcast scenarios.In a second part of the thesis the problem of synchronization is reviewed in the context of interference limited scenarios for broadband satellite return channels. Spectral efficiency is of great concern in the return channel of satellite based broadband systems. In recent work the feasibility of increased efficiency by reducing channel spacing below the Symbol Rate was demonstrated using joint detection and decoding for a synchronized system. We extend this work by addressing the critical synchronization problem in the presence of adjacent channel interference (ACI) which limits performance as carrier spacing is reduced.A pilot sequence aided joint synchronization scheme for a multi-frequency time division multiple access (MF-TDMA) system is proposed. Based on a maximum likelihood (ML) criterion, the channel parameters, including frequency, time and phase are jointly estimated for the channel of interest and the adjacent channels. The impact of ACI on the synchronization and detection performance is investigated. It is shown that joint channel parameter estimation outperforms single carrier synchronization with reasonable additional computational complexity in the receiver. Based on the proposed synchronization scheme in conjunction with an appropriate joint detection mechanism the carrier spacing can be reduced significantly compared to current systems providing a substantial increase in spectral efficiency. [less ▲]

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See detailAn internal version of epistemic logic
Aucher, Guillaume UL

in Studia Logica (2010), 94(1), 1-22

Representing an epistemic situation involving several agents obviously depends on the modeling point of view one takes. We start by identifying the types of modeling points of view which are logically ... [more ▼]

Representing an epistemic situation involving several agents obviously depends on the modeling point of view one takes. We start by identifying the types of modeling points of view which are logically possible. We call the one traditionally followed by epistemic logic the perfect external approach, because there the modeler is assumed to be an omniscient and external observer of the epistemic situation. In the rest of the paper we focus on what we call the internal approach, where the modeler is one of the agents involved in the situation. For this approach we propose and axiomatize a logical formalism based on epistemic logic. This leads us to formalize some intuitions about the internal approach and about its connections with the external ones. Finally, we show that our internal logic is decidable and PSPACE-complete. [less ▲]

Detailed reference viewed: 68 (0 UL)
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See detailThe Introduction of a Design Heuristics Extraction Method
Matthews, P. C.; Blessing, Lucienne UL; Wallace, K. M.

in Advanced Engineering Informatics (2002), 16

Detailed reference viewed: 63 (1 UL)
See detailIntroduction of the European Association for Data Science
Krolak-Schwerdt, Sabine; Böhmer, Matthias UL

Scientific Conference (2015, November)

Detailed reference viewed: 18 (0 UL)