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See detailNonlinear and Neural Network-based Control of a Small Four-Rotor Aerial Robot
Voos, Holger UL

in IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM, Zurich, Switzerland, 2007 (2007)

Detailed reference viewed: 102 (0 UL)
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See detailReasoning About Norms, Obligations, Time and Agents
Broersen, Jan UL; van der Torre, Leon UL

in PRIMA (2007)

Reasoning about norms and time is of central concern to the regulation or control of the behavior of a multiagent system. In this paper we introduce a representation of normative systems that ... [more ▼]

Reasoning about norms and time is of central concern to the regulation or control of the behavior of a multiagent system. In this paper we introduce a representation of normative systems that distinguishes between norms and the detached obligations of agents over time, leading to a simple and therefore practical way to reason about norms, obligations, time and agents. We consider the reasoning tasks to determine whether a norm is redundant in a normative system and whether two normative systems are equivalent. In the former case the redundant norm might be removed. In the latter case one norm might be replaced by the other. It is well known that properties concerning iterated or deontic detachment no longer hold when reasoning with multiple agents or with obligations over time. Yet, earlier approaches to reasoning about norms rarely consider the intricacies of time. We show how norms can be used to define the persistence of obligations of agents over time. We illustrate our approach by discussing three ways to relate norms and obligations of agents over time. Also we show how these three ways can be characterized. [less ▲]

Detailed reference viewed: 70 (0 UL)
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See detailContextual Agent Deliberation in Defeasible Logic
Dastani, Mehdi UL; Governatori, Guido UL; Rotolo, Antonino UL et al

in PRIMA (2007)

This article extends Defeasible Logic to deal with the contextual de- liberation process of cognitive agents. First, we introduce meta-rules to reason with rules. Meta-rules are rules that have as a ... [more ▼]

This article extends Defeasible Logic to deal with the contextual de- liberation process of cognitive agents. First, we introduce meta-rules to reason with rules. Meta-rules are rules that have as a consequent rules for motivational components, such as obligations, intentions and desires. In other words, they in- clude nested rules. Second, we introduce explicit preferences among rules. They deal with complex structures where nested rules can be involved. [less ▲]

Detailed reference viewed: 76 (0 UL)
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See detailAn Attacker Model for Normative Multi-agent Systems
van der Torre, Leon UL; Boella, Guido

in Multi-Agent Systems and Applications V, 5th International Central and Eastern European Conference on Multi-Agent Systems, CEEMAS 2007, Leipzig, Germany, September 25-27, 2007, Proceedings (2007)

In this paper we introduce a formal attacker model for nor- mative multi-agent systems. In this context, an attacker is an agent try- ing to profit from norm violation, for example because the violation ... [more ▼]

In this paper we introduce a formal attacker model for nor- mative multi-agent systems. In this context, an attacker is an agent try- ing to profit from norm violation, for example because the violation is not detected, it is not being sanctioned, or the sanction is less than the profit of violation. To deliberate about norm violations, an attacker has a self model and a model of the normative multi-agent system, which in our case have the same structure. Moreover, we assume that an attacker violates a norm only when it profits from it, and the attacker therefore plays a violation game with the system. On a variety of examples, we show also how our model of violation games based also on agent abilities or power extends our earlier model based on motivations only [less ▲]

Detailed reference viewed: 79 (0 UL)
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See detailPrediction of Protein-Protein Interactions Using Bayesian Networks
Nguyen, Thanh-Phuong UL; Ho, Tu Bao; Nguyen, Ngoc Binh

in Proceeding of the 2nd International Conference on Knowledge, Information and Creativity Support Systems (KICSS 2007) (2007)

Detailed reference viewed: 28 (2 UL)
See detail'If I don't learn English I'm going to suffer': Gambian lower basic school's children's perspective on the importance of English
Juffermans, Kasper UL

in Cheung, Siu-Keung; Traver, Harold; Li, Xiuguo (Eds.) Proceedings of the 8th Annual Conference of the Hong Kong Sociological Association (2006, December)

Detailed reference viewed: 57 (0 UL)
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See detailSelbstgesteuerte Skifahren lernen?
Bund, Andreas UL

in Bach, Inge (Ed.) Skilauf und Snowboard in Forschung und Lehre (2006, December)

Detailed reference viewed: 87 (1 UL)
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See detailLes femmes entrepreneures et la transmission d’entreprise
Constantinidis, Christina UL; Cornet, Annie

in AIREPME (Ed.) Actes du 8ème CIFEPME (2006, October)

Cette communication présente des résultats de recherche afférant à la reprise d’entreprise familiale par des filles d’entrepreneurs. Nous identifions les différentes stratégies mises en oeuvre par les ... [more ▼]

Cette communication présente des résultats de recherche afférant à la reprise d’entreprise familiale par des filles d’entrepreneurs. Nous identifions les différentes stratégies mises en oeuvre par les femmes repreneuses dans ce contexte d’entreprise familiale pour asseoir leur crédibilité et affirmer leur identité de femmes chefs d’entreprise. Ces stratégies peuvent se concevoir en termes de choix des personnes-clés dans leur entourage, de développement de compétences spécifiques, de gestion des ressources humaines, ou de comportements en matière financière et bancaire. [less ▲]

Detailed reference viewed: 240 (0 UL)
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See detailImplementation and validation of a simple probabilistic tool for finite element codes
Van Baars, Stefan UL

in Numerical Methods in Geotechnical Engineering: Sixth European Conference on Numerical Methods in Geotechnical Engineering (Graz, Austria, 6-8 September 2006) (2006, August)

Both a circular slip surface stability calculation (Bishop or Fellenius) and a FEM calculation (c-phi reduction) produce a safety factor but not a probability of failure or reliability index. The mayor ... [more ▼]

Both a circular slip surface stability calculation (Bishop or Fellenius) and a FEM calculation (c-phi reduction) produce a safety factor but not a probability of failure or reliability index. The mayor problem with the probabilistical calculations is that variable soil parameters create a correlated and therefore also variable failure mechanism. The question is how much the value of the calculated probability of failure is influenced by this correlation. The Monte-Carlo method leads, because of the many slip surface calculations, to the most accurate calculation of the probability of safety. The disadvantage of this method is that it is far too time consuming for daily FEM calculations. The idea is therefore to replace the Monte-Carlo approach by another approach with only a limited amount of calculations. In this paper several methods are discussed and validated. An indication is given about the error, the number of necessary stability calculations and the optimal estimation points for an additional stability calculation. In this way a minimum number of FEM calculations is needed to obtain a certain desired accuracy. [less ▲]

Detailed reference viewed: 65 (2 UL)
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See detailSelf-controlled practice of decision-making skills
Bund, Andreas UL; Memmert, Daniel

in Hoppeler, H.; Reilly, T.; Tsolakidis, E. (Eds.) et al Book of Abstracts (2006, July)

Detailed reference viewed: 76 (0 UL)
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See detailWeighted lattice polynomials
Marichal, Jean-Luc UL

in Proc. 11th Int. Conf. on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU 2006), Paris, France, July 2-7, 2006 (2006, July)

We define the concept of weighted lattice polynomials as lattice polynomials constructed from both variables and parameters. We provide equivalent forms of these functions in an arbitrary bounded ... [more ▼]

We define the concept of weighted lattice polynomials as lattice polynomials constructed from both variables and parameters. We provide equivalent forms of these functions in an arbitrary bounded distributive lattice. We also show that these functions include the class of discrete Sugeno integrals and that they are characterized by a remarkable median based decomposition formula. [less ▲]

Detailed reference viewed: 83 (0 UL)
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See detailExamination of a model over self-controlled motion-learning
Bund, Andreas UL; Ferwagner, Dirk

in Hoppeler, H.; Reilly, T.; Tsolakidis, E. (Eds.) et al Book of Abstracts (2006, July)

Detailed reference viewed: 27 (1 UL)
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See detailMotivations- und Emotionsverläufe beim selbstgesteuerten Bewegungslernen
Bund, Andreas UL

in Halberschmidt, Barbara; Strauß, Bernd (Eds.) Elf Freunde sollt ihr sein!? (2006, May)

Detailed reference viewed: 34 (0 UL)
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See detailCCK: An Improved Coordinated Checkpoint/Rollback Protocol for Dataflow Applications in Kaapi
Besseron, Xavier UL; Jafar, Samir; Gautier, Thierry et al

in 2006 2nd International Conference on Information & Communication Technologies (2006, April)

Detailed reference viewed: 88 (0 UL)
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See detailThe weighted lattice polynomials as aggregation functions
Marichal, Jean-Luc UL

in Proc. 63rd Meeting of the Eur. Working Group "Multiple Criteria Decision Aiding" (MCDA 63) (2006, March)

We define the concept of weighted lattice polynomials as lattice polynomials constructed from both variables and parameters. We provide equivalent forms of these functions in an arbitrary bounded ... [more ▼]

We define the concept of weighted lattice polynomials as lattice polynomials constructed from both variables and parameters. We provide equivalent forms of these functions in an arbitrary bounded distributive lattice. We also show that these functions include the class of discrete Sugeno integrals and that they are characterized by a remarkable median based decomposition formula. [less ▲]

Detailed reference viewed: 30 (1 UL)
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See detailCumulative distribution functions and moments of weighted lattice polynomials
Marichal, Jean-Luc UL

in Fodor, János; Klement, Erich Peter; Roubens, Marc (Eds.) Proc. 27th Linz Seminar on Fuzzy Set Theory (LINZ 2006): Preferences, Games and Decisions (2006, February)

We give the cumulative distribution functions, the expected values, and the moments of weighted lattice polynomials when regarded as real functions. Since weighted lattice polynomial functions include ... [more ▼]

We give the cumulative distribution functions, the expected values, and the moments of weighted lattice polynomials when regarded as real functions. Since weighted lattice polynomial functions include Sugeno integrals, lattice polynomial functions, and order statistics, our results encompass the corresponding formulas for these particular functions. [less ▲]

Detailed reference viewed: 39 (1 UL)
See detailMort et pouvoir: le choix du lieu de sépulture (espace Meuse-Moselle, XIe-XIIe siècles)
Margue, Michel UL

in Sépulture, mort et représentation du pouvoir au moyen âge. Tod: Grabmal und Herrschaftsrepräsentation im Mittelalter. Actes des 11es Journées Lotharingiennes, 26-29 septembre 2000 (2006)

Detailed reference viewed: 19 (0 UL)
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See detailPermissions and Uncontrollable Propositions in DSDL3: Non-monotonicity and Algorithms.
Kaci, Souhila UL; van der Torre, Leon UL

in Deontic Logic and Artificial Normative Systems, 8th International Workshop on Deontic Logic in Computer Science, DEON 2006, Utrecht, The Netherlands, July 12-14, 2006, Proceedings (2006)

In this paper we are interested in non-monotonic extensions of Bengt Hansson’s standard dyadic deontic logic 3, known as DSDL3. We study specificity principles for DSDL3 with both controllable and ... [more ▼]

In this paper we are interested in non-monotonic extensions of Bengt Hansson’s standard dyadic deontic logic 3, known as DSDL3. We study specificity principles for DSDL3 with both controllable and uncontrollable propositions. We introduce an algorithm for minimal specificity which not only covers obligations but also permissions, and we discuss the distinction between weak and strong permissions. Moreover, we introduce ways to combine algorithms for minimal and maximal specificity for DSDL3 with controllable and uncontrollable propositions, based on ‘optimistic’ and ‘pessimistic’ reasoning respectively. [less ▲]

Detailed reference viewed: 74 (0 UL)
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See detailSurvivable Passive Access Network (SPAN)
Wasim, Muhammad Umer UL; Zaidi, Syed Muhammad Hassan; Raja, Yasin et al

in Conference on Next-Generation Communication and Sensor Networks (Optics East), October 02-04, Boston, Massachusetts USA. (2006)

Wavelength Division Multiplexed based Passive Optical Networks (WDM-PON) are subjected to wide variety of incidental failures. It is preferred in WDM-PONs to provide fault management (survivability) at ... [more ▼]

Wavelength Division Multiplexed based Passive Optical Networks (WDM-PON) are subjected to wide variety of incidental failures. It is preferred in WDM-PONs to provide fault management (survivability) at link layer level. In this paper, our objective is to determine the factors, which can increase the scope of survivability at link layer, not available currently. We propose a cost-effective recovery mechanism, called "Survivable Passive Access Network" (SPAN). SPAN is a multi-level protection scheme that has potential to be highly efficient and scaleable in terms of performance budget. BER performance and power penalty factors remain acceptable while switching traffic from normal path to protection path in case of failure. [less ▲]

Detailed reference viewed: 78 (3 UL)
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See detailAnalyse prozessbezogener Einflussfaktoren zur Steigerung der Robustheit von Produktenwicklungsprojekten
Gericke, Kilian UL; Blessing, Lucienne UL

in Proceedings of 17th Symposium Design for X (2006)

Auf Basis des Konzeptes der Robustheit von Produktentwicklungsprojekten werden Effekte dargelegt, die zu Planungsabweichungen führen. Das Konzept wird durch eine Diskussion der Erfolgskriterien von ... [more ▼]

Auf Basis des Konzeptes der Robustheit von Produktentwicklungsprojekten werden Effekte dargelegt, die zu Planungsabweichungen führen. Das Konzept wird durch eine Diskussion der Erfolgskriterien von Projekten und möglichen Ansatzpunkten zur Steigerung der Robustheit umrissen. Als Ergebnis einer Literaturstudie wurden Problemschwerpunkte hinsichtlich der Ursachen von Planungsabweichungen und deren Erscheinungsformen identifiziert. Auf Grundlage dieser Studien lassen sich jedoch keine Ansätze zur Steigerung der Robustheit von Produktentwicklungsprojekten ableiten. Die Betrachtung der Studien bildet den Ausgangspunkt für eigene Untersuchungen, die zu einem besseren Verständnis der Ursachen von Planungsabweichungen in Produktentwicklungsprojekten und zur Ableitung von Handlungsempfehlungen führen sollen. [less ▲]

Detailed reference viewed: 42 (0 UL)
See detailIl contributo delle fiere e dei mercati all'integrazione europea nel primo medioevo
Pauly, Michel UL

in Cracco, Giorgio; Le Goff, Jacques; Keller, Hagen (Eds.) et al Europa in costruzione. La forza delle identità,la ricerca di unità (secoli IX-XIII) (2006)

Detailed reference viewed: 23 (0 UL)
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See detailClinical data based optimal STI strategies for HIV: a reinforcement learning approach
Ernst, D.; Stan, G.B.; Goncalves, Jorge UL et al

in Proceedings of the IEEE Conference on Decision and Control (2006)

This paper addresses the problem of computing optimal structured treatment interruption strategies for HIV infected patients. We show that reinforcement learning may be useful to extract such strategies ... [more ▼]

This paper addresses the problem of computing optimal structured treatment interruption strategies for HIV infected patients. We show that reinforcement learning may be useful to extract such strategies directly from clinical data, without the need of an accurate mathematical model of HIV infection dynamics. To support our claims, we report simulation results obtained by running a recently proposed batch-mode reinforcement learning algorithm, known as fitted Q iteration, on numerically generated data. [less ▲]

Detailed reference viewed: 96 (0 UL)
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See detailDecentralized planning under uncertainty for teams of communicating agents
Spaan, Matthijs T. J.; Gordon, Geoffrey J.; Vlassis, Nikos UL

in Proc. Int. Joint Conf. on Autonomous Agents and Multiagent Systems, Hakodate, Japan (2006)

Decentralized partially observable Markov decision processes (DEC-POMDPs) form a general framework for planning for groups of cooperating agents that inhabit a stochastic and partially observable ... [more ▼]

Decentralized partially observable Markov decision processes (DEC-POMDPs) form a general framework for planning for groups of cooperating agents that inhabit a stochastic and partially observable environment. Unfortunately, computing optimal plans in a DEC-POMDP has been shown to be intractable (NEXP-complete), and approximate algorithms for specific subclasses have been proposed. Many of these algorithms rely on an (approximate) solution of the centralized planning problem (i.e., treating the whole team as a single agent). We take a more decentralized approach, in which each agent only reasons over its own local state and some uncontrollable state features, which are shared by all team members. In contrast to other approaches, we model communication as an integral part of the agent's reasoning, in which the meaning of a message is directly encoded in the policy of the communicating agent. We explore iterative methods for approximately solving such models, and we conclude with some encouraging preliminary experimental results. [less ▲]

Detailed reference viewed: 61 (0 UL)
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See detailSafe Distributed Architecture for Image-based Computer Assisted Diagnosis
Varrette, Sébastien UL; Roch, J.-L.; Montagnat, J. et al

in Proc. of the IEEE Intl. Conf. on Pervasive Services, Workshop on Health Pervasive Systems (HPS'06) (2006)

Detailed reference viewed: 38 (0 UL)
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See detailDer "ehrsame Herr Johannes Baumgaerten in Bordeaux" (1632 - 1702). Ein preußischer Kaufmann im Frankreichhandel der Frühen Neuzeit.
Voss, Peter UL

in Richefort, Isabelle; Schmidt, Burghart (Eds.) Les relations entre la France et les villes hanséatiques de Hambourg, Brême et Lübeck. Moyen-Age - XIX siècle/Die Beziehungen zwischen Frankreich und den Hansestädten Hamburg, Bremen und Lübeck. Mittelalter - 19. Jahrhundert (2006)

Detailed reference viewed: 26 (0 UL)
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See detailApplicative Solutions for Safe Computations in Distributed Environments
Varrette, Sébastien UL; Roch, J.-L.; Leprévost, Franck UL

in Workshop "Trustworthy Software" (2006)

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See detailThe guided Tour and the leisure’s visitors
Schall, Céline UL; Davallon, Jean; Vilatte, Jean-Christophe

in Gottesdiener, Hana; Vilatte, Jean-Christophe (Eds.) Culture & Communication, Proceedings of the 19th Congress of the International Association of Empirical Aesthetics (2006)

Detailed reference viewed: 21 (3 UL)
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See detailComposing transformation operations based on complex source pattern definitions
Göknil, Arda UL; Topaloglu, N. Y.

in First European Workshop on Composition of Model Transformations-CMT (2006)

Detailed reference viewed: 22 (0 UL)
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See detailAgency and learning in the lifecourse
Biesta, Gert UL; Tedder, M.

in Proceedings of the 26th Annual Conference of SCUTREA: Inter-cultural perspectives on research into adult learning: A global dialogue. (2006)

Detailed reference viewed: 48 (3 UL)
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See detailModelling the Interaction Between Objects: Roles as Affordances
Baldoni, Matteo UL; Boella, Guido UL; van der Torre, Leon UL

in Knowledge Science, Engineering and Management, First International Conference, KSEM 2006 (2006)

In this paper we present a new vision of objects in ontologies where the objects’ attributes and operations depend on who is interacting with them. This vision is based on a new definition of the notion ... [more ▼]

In this paper we present a new vision of objects in ontologies where the objects’ attributes and operations depend on who is interacting with them. This vision is based on a new definition of the notion of role, which is inspired by the concept of affordance as developed in cognitive science. The current vision of objects considers attributes and operations as being objective and independent from the interaction. In contrast, in our model interaction with an object always passes through a role played by another object manipulating it. The advantage is that roles allow to define operations whose behavior changes depending on the role and the requirements it imposes, and to define session aware interaction, where the role maintains the state of the interaction with an object. Finally, we provide a description of the model in UML and we discuss how roles as affor- dances have been introduced in Java [less ▲]

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See detailA Logic of Abstract Argumentation
Boella, Guido; Hulstijn, J.; van der Torre, Leon UL

in Argumentation in Multi-Agent Systems, Second International Workshop, ArgMAS 2005, Utrecht, The Netherlands, July 26, 2005, Revised Selected and Invited Papers (2006)

In this paper we introduce a logic of abstract argumentation capturing Dung’s theory of abstract argumentation, based on connectives for attack and defend. We extend it to a modal logic of abstract ... [more ▼]

In this paper we introduce a logic of abstract argumentation capturing Dung’s theory of abstract argumentation, based on connectives for attack and defend. We extend it to a modal logic of abstract argumentation to generalize Dung’s theory and define variants of it. Moreover, we use the logic to relate Dung’s theory of abstract argumentation to more traditional conditional and comparative formalisms, and we illustrate how to reason about arguments in meta-argumentation [less ▲]

Detailed reference viewed: 68 (0 UL)
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See detailImplementation of efficient proactive computing using lazy evaluation in a learning management system
Zampunieris, Denis UL

in Proceedings of "m-ICTE - International Conference on Multimedia and Information & Communication Technologies in Education" (2006)

In [Zampunieris, 2006] we proposed a new kind of Learning Management Systems: proactive LMS, designed to help their users to better interact online by providing programmable, automatic and continuous ... [more ▼]

In [Zampunieris, 2006] we proposed a new kind of Learning Management Systems: proactive LMS, designed to help their users to better interact online by providing programmable, automatic and continuous analyses of users (inter-) actions augmented with appropriate actions initiated by the LMS itself. The proactive part of our LMS is based on a dynamic rules-based system. But the main algorithm we proposed in order to implement the rules running system, suffers some efficiency problems. In this paper, we propose a new version of the main rules running algorithm that is based on lazy evaluation in order to avoid unnecessary and time-costly requests to the LMS database when a rule is not activated, that is: when its actions part will not be performed because preliminary checks failed. [less ▲]

Detailed reference viewed: 172 (16 UL)
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See detailZIB Structure Prediction Pipeline: Composing a Complex Biological Workflow through Web Services
May, Patrick UL; Ehrlich, Hans-Christian; Steinke, Thomas

in Nagel, Wolfgang E.; Walter, Wolfgang V.; Lehner, Wolfgang (Eds.) Euro-Par 2006 Parallel Processing (2006)

In life sciences, scientists are confronted with an exponential growth of biological data, especially in the genomics and proteomics area. The efficient management and use of these data, and its ... [more ▼]

In life sciences, scientists are confronted with an exponential growth of biological data, especially in the genomics and proteomics area. The efficient management and use of these data, and its transformation into knowledge are basic requirements for biological research. Therefore, integration of diverse applications and data from geographically distributed computing resources will become a major issue. We will present the status of our efforts for the realization of an automated protein prediction pipeline as an example for a complex biological workflow scenario in a Grid environment based on Web services. This case study demonstrates the ability of an easy orchestration of complex biological workflows based on Web services as building blocks and Triana as workflow engine. [less ▲]

Detailed reference viewed: 207 (3 UL)
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See detailLa pratique de la vengeance et ses avatars : éléments pour une poétique de la vengeance-événement
Colas-Blaise, Marion UL

in La vengeance et ses discours. Actes du 26e colloque d'Albi (2006)

Detailed reference viewed: 42 (1 UL)
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See detailAn analytic solution to discrete Bayesian reinforcement learning
Poupart, Pascal; Vlassis, Nikos UL; Hoey, Jesse et al

in Proc Int. Conf. on Machine Learning, Pittsburgh, USA (2006)

Reinforcement learning (RL) was originally proposed as a framework to allow agents to learn in an online fashion as they interact with their environment. Existing RL algorithms come short of achieving ... [more ▼]

Reinforcement learning (RL) was originally proposed as a framework to allow agents to learn in an online fashion as they interact with their environment. Existing RL algorithms come short of achieving this goal because the amount of exploration required is often too costly and/or too time consuming for online learning. As a result, RL is mostly used for offline learning in simulated environments. We propose a new algorithm, called BEETLE, for effective online learning that is computationally efficient while minimizing the amount of exploration. We take a Bayesian model-based approach, framing RL as a partially observable Markov decision process. Our two main contributions are the analytical derivation that the optimal value function is the upper envelope of a set of multivariate polynomials, and an efficient point-based value iteration algorithm that exploits this simple parameterization. [less ▲]

Detailed reference viewed: 78 (0 UL)
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See detailMetamodeling of semantic web enabled multiagent systems
Kardas, G.; Göknil, Arda UL; Dikenelli, O. et al

in Multiagent Systems and Software Architecture (MASSA), Erfurt, Germany 2013-12-05 15:30:26 +0000 (2006)

Detailed reference viewed: 31 (0 UL)
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See detailInquiring the Potential of Evoking Small-World Properties for Self- Organizing Communication Networks
Brust, Matthias R. UL; Rothkugel, Steffen UL; Ribeiro, Carlos H. C.

in Proceedings of International Conference on Systems and International Conference on Mobile Communications and Learning Technologies (ICNICONSMCL'06) (2006)

Detailed reference viewed: 76 (3 UL)
See detailLa figure du détective/espion comme métaphore de l'identité hybride
Glesener, Jeanne UL

in Rinner, Fridrun (Ed.) Identité et métamorphose dans l'écriture contemporaine (2006)

Detailed reference viewed: 56 (0 UL)
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See detailCompétences relatives à l'employabilité et qualité de vie des étudiants
Amara, Marie-Emmanuelle UL; Baumann, Michèle UL

in Scientific, Committee (Ed.) European Summer University for Research and Innovations. (2006)

Detailed reference viewed: 61 (2 UL)
Peer Reviewed
See detailSimulating Realistic Mobility Models for Large Heterogeneous MANETs
Hogie, Luc UL; Bouvry, Pascal UL; Guinand, Frédéric et al

in 9th ACM/IEEE International Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWIM'06) (2006)

Detailed reference viewed: 78 (0 UL)
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See detailExtended Survivable Passive Access Network (e-SPAN)
Wasim, Muhammad Umer UL; Zaidi, Syed Muhammad Hassan; Raja, Yasin et al

in Symposium on High Capacity Optical Networks and Enabling Technologies (HONET), September 6-8, Charlotte (NC) USA. (2006)

Wavelength Division Multiplexed based Passive Optical Networks (WDM-PON) are subjected to wide variety of incidental failures. It is preferred in WDM-PONs to provide fault management (survivability) at ... [more ▼]

Wavelength Division Multiplexed based Passive Optical Networks (WDM-PON) are subjected to wide variety of incidental failures. It is preferred in WDM-PONs to provide fault management (survivability) at link layer level. In this paper, our objective is to determine the factors, which can increase the scope of survivability at link layer, not available currently. We propose a cost-effective recovery mechanism, called ldquoExtended Survivable Passive Access Networkrdquo (e-SPAN). e SPAN is a multi-level protection scheme that has potential to corrects eventual errors that are caused by the transmission system by using different forward error correcting codes at receiver end, thus allowing us to have better performance budget in terms of BER and extended transmission distance of 8 to 12 Km. [less ▲]

Detailed reference viewed: 83 (4 UL)
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See detailAcyclic Argumentation: Attack = Conflict + Preference
Kaci, S.; van der Torre, Leon UL; Weydert, Emil UL

in Acyclic Argumentation: Attack = Conflict + Preference (2006)

Detailed reference viewed: 52 (1 UL)
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See detailComparison of AlGaN/GaN MSM varactor diodes based on HFET and MOSHFET layer structures
Marso, Michel UL; Fox, A.; Heidelberger, G. et al

in Proc. 6th Intern. Conf. Advanced Semicon. Dev. & Microsystems ASDAM’06 (2006)

In this comparative study we investigate the performance of AlGaN/GaN based MSM varactor diodes based on HFET and MOSHFET layer systems. Device fabrication uses standard HFET fabrication technology ... [more ▼]

In this comparative study we investigate the performance of AlGaN/GaN based MSM varactor diodes based on HFET and MOSHFET layer systems. Device fabrication uses standard HFET fabrication technology, allowing easy integration in MMICs. Devices with different electrode geometries are characterized by DC and by S-parameter measurements up to 50 GHz. The HFET based varactors show capacitance ratios up to 14. The MOSHFET based devices, on the other hand, exhibit lower capacitance ratios and poorer stability because of theinsulation layer between electrodes and semiconductor. [less ▲]

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See detailRF characterization and modeling of AlGaN/GaN based HFETs and MOSHFETs
Fox, A.; Marso, Michel UL; Heidelberger, G. et al

in Proc. 6th Intern. Conf. Advanced Semicon. Dev. & Microsystems ASDAM’06 (2006) (2006)

An increased RF-Performance of heterojunction field-effect transistor was found to be due to passivation and in addition a SiO2 insulation underneath the gate metallization. This leads to an increase of ... [more ▼]

An increased RF-Performance of heterojunction field-effect transistor was found to be due to passivation and in addition a SiO2 insulation underneath the gate metallization. This leads to an increase of cutoff frequency from 17 GHz up to 24 GHz for devices with 500 nm gate length. The RF output power increased from 4.1 to 6.7 W/mm at 7 GHz. RF simulation based on measured S-parameter showed a decrease of gate-source-capacitance and transconductance for devices with a dielectric layer underneath the gate metallization. The increase of the ratio gm/Cgs of about 25% is in agreement with the measured cutoff frequency ft. [less ▲]

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See detailPlurilinguisme entre valorisation et dévalorisation. Quelques résultats à l’issu d’une recherche sur le rôle des ‘langues d’origine’ dans les classes de LE en Allemagne
Hu, Adelheid UL

in Bach, G.; Holtzer, G. (Eds.) Pourquoi apprendre les langues? Orientations pragmatiques et pédagogiques. (2006)

Detailed reference viewed: 40 (0 UL)
Peer Reviewed
See detailSensitivity analysis of programmed cell death and implications for crosstalk phenomena during Tumor Necrosis Factor stimulation
Eissing, Thomas; Bullinger, Eric; Waldherr, Steffen et al

in Proceedings of IEEE International Conference on Control Applications (CCA), October 4-6, 2006, Technische Universität München, Germany (2006)

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See detailUsing the max-plus algorithm for multiagent decision making in coordination graphs
Kok, Jelle R.; Vlassis, Nikos UL

in Proc. RoboCup Int. Symposium, Osaka, Japan (2006)

Coordination graphs offer a tractable framework for cooperative multiagent decision making by decomposing the global payoff function into a sum of local terms. Each agent can in principle select an ... [more ▼]

Coordination graphs offer a tractable framework for cooperative multiagent decision making by decomposing the global payoff function into a sum of local terms. Each agent can in principle select an optimal individual action based on a variable elimination algorithm performed on this graph. This results in optimal behavior for the group, but its worst-case time complexity is exponential in the number of agents, and it can be slow in densely connected graphs. Moreover, variable elimination is not appropriate for real-time systems as it requires that the complete algorithm terminates before a solution can be reported. In this paper, we investigate the max-plus algorithm, an instance of the belief propagation algorithm in Bayesian networks, as an approximate alternative to variable elimination. In this method the agents exchange appropriate payoff messages over the coordination graph, and based on these messages compute their individual actions. We provide empirical evidence that this method converges to the optimal solution for tree-structured graphs (as shown by theory), and that it finds near optimal solutions in graphs with cycles, while being much faster than variable elimination. [less ▲]

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See detailCrePes-Towards a Collaborative M-Learning Platform Leveraging Algorithmic Understanding in Schools
Gratz, Patrick UL; Rothkugel, Steffen UL; Scholtes, Ingo et al

in Proceedings of IADIS-2006: International Conference Mobile Learning 2006 (2006)

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See detailImplementation of a Proactive Learning Management System
Zampunieris, Denis UL

in Proceedings of "E-Learn - World Conference on E-Learning in Corporate, Government, Healthcare & Higher Education" (2006)

This paper proposes a new kind of Learning Management Systems: proactive LMS, designed to help their users to better interact online in an educational or training environment, by providing programmable ... [more ▼]

This paper proposes a new kind of Learning Management Systems: proactive LMS, designed to help their users to better interact online in an educational or training environment, by providing programmable, automatic and continuous analyses of users (inter)actions augmented with appropriate actions initiated by the LMS itself. We explain how to implement such a proactive LMS on the basis of a dynamic rules-based software system. We also give examples of rules e.g. to show how the proactive system can automatically take care of users and check some awaited users’ behaviors and react if these actions do not happen. [less ▲]

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See detailModular Neural Network and Classical Reinforcement Learning for Autonomous Robot Navigation: Inhibiting Undesirable Behaviors
Antonelo, Eric Aislan UL; Baerlvedt, Albert-Jan; Rognvaldsson, Thorsteinn et al

in The 2006 IEEE International Joint Conference on Neural Network Proceedings (2006)

Classical reinforcement learning mechanisms and a modular neural network are unified to conceive an intelligent autonomous system for mobile robot navigation. The conception aims at inhibiting two common ... [more ▼]

Classical reinforcement learning mechanisms and a modular neural network are unified to conceive an intelligent autonomous system for mobile robot navigation. The conception aims at inhibiting two common navigation deficiencies: generation of unsuitable cyclic trajectories and ineffectiveness in risky configurations. Different design apparatuses are considered to compose a system to tackle with these navigation difficulties, for instance: 1) neuron parameter to simultaneously memorize neuron activities and function as a learning factor, 2) reinforcement learning mechanisms to adjust neuron parameters (not only synapse weights), and 3) a inner-triggered reinforcement. Simulation results show that the proposed system circumvents difficulties caused by specific environment configurations, improving the relation between collisions and captures. [less ▲]

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See detailAufgabenorientierung. Überlegungen zu einem pragmatischen Konzept sprachlichen Lernens zwischen Tasked Based Learning und Testaufgaben.
Hu, Adelheid UL

in Bausch, K.-R.; Burwitz-Melzer, E.; Königs, F. (Eds.) et al Dokumentation der Frühjahrskonferenz zur Erforschung des Fremdsprachenlernens Februar 2006 (2006)

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See detailLandscape Maps for Enterprise Architectures
van der Torre, Leon UL; Lankhorst, M.; ter Doest, H. et al

in Advanced Information Systems Engineering, 18th International Conference, CAiSE 2006, Luxembourg, Luxembourg, June 5-9, 2006, Proceedings (2006)

Landscape maps are a technique for visualizing enterprise architectures. They present architectural elements in the form of an easy to understand 2D ’map’. A landscape map view on architectures provides ... [more ▼]

Landscape maps are a technique for visualizing enterprise architectures. They present architectural elements in the form of an easy to understand 2D ’map’. A landscape map view on architectures provides non-technical stakeholders, such as managers, with a high-level overview, without burdening them with technicalities of architectural drawings. In this paper we discuss the use of and techniques for landscape maps. A formal model for landscape maps is introduced as the basis of visualization and interaction techniques. Moreover, we show how a landscape map can be generated from its underlying model. Finally we show several interaction techniques, for example to build a landscape map from scratch, independently of an underlying model, or to change a landscape map together with its underlying model [less ▲]

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See detailhLCGA: A Hybrid Competitive Coevolutionary Genetic Algorithm
Danoy, Grégoire UL; Bouvry, Pascal UL; Martins, Tomy

in HIS'06: Proceedings of the 6th international conference on Hybrid Intelligent Systems (2006)

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See detailZu gutem Frieden und Eintracht strebend - Norm und Praxis in Leprosorien des 15. Jahrhunderts im Spiegel ihrer Statuten. Das Beispiel Trier
Uhrmacher, Martin UL

in Schmitt, Sebastian; Aspelmeier, Jens (Eds.) Norm und Praxis der Armenfürsorge in Spätmittelalter und früher Neuzeit (2006)

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See detailSocial inequalities of health and handicap. The example of the cerebral vascular attack
Aïach, P.; Baumann, Michèle UL

in Scientific, Committee (Ed.) European Society for Health and Medical Sociology (2006)

The social inequalities of health are observed in the field of illness and death. What about the inequalities with a handicap?. The studies and surveys that highlight the relationship between handicap and ... [more ▼]

The social inequalities of health are observed in the field of illness and death. What about the inequalities with a handicap?. The studies and surveys that highlight the relationship between handicap and social health inequalities are cruelly lacking. It is for this reason that we tried to explore this relationship in the scope of a survey carried out in France on the social and family repercussions of a cerebral vascular attack. The method used, a significant national survey in France (1000 people questioned in 260 families where a stroke took place in the previous year), carried out in 2004/2005 taking into account the family repercussion of a cerebral vascular attack, we tried to highlight the differences and the social inequalities that exist as much in the frequency and the gravity of deficiencies due to a stroke, as in the effects produced on the family life, in particular to the spouse. This survey, conducted in the home, is made up of three questionnaires, one of which is the main one( particularly the spouse’s) takes into account all the aspects of family life and the social relationships whilst trying to highlight the repercussions following the stroke. The results. The results show the extent of the impact on the family, especially in the relationship of the couple. On the whole, they confirm the assumption of social inequalities between social groups defined according to the income, the educational level and the profession, in particular with regards to the gravity of deficiencies, progress of rehabilitation, the quality of the financial responsibility, the standard of living and in several dimensions of social life (leisure and cultural activities). However it is necessary to underline the difficulty in isolating the social inequalities which are expressed apart from the situation due to the stroke; inequalities which can be enhanced or which take on a particular character because of this accident. Conclusion We can hold on to the hypothesis that the stroke represents an event that can be considered as an indicator of the previous social state and relationship, bringing on in some way aggravating effects that can be as positive as they can be negative. Social health inequalities must be analyses whilst taking this hypothesis into account. [less ▲]

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See detailMort et pouvoir. Le choix du lieu de sépulture (Xe-XIIe siècles)
Margue, Michel UL

in Actes du colloque international "Sépultures, mort et symbolique du pouvoir au moyen âge (11es Journées Lotharingiennes) (2006)

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See detailSigismund und Europa. Einleitung
Pauly, Michel UL

in Pauly, Michel; Reinert, Frank (Eds.) Sigismund von Luxemburg. Ein Kaiser in Europa. Tagungsband des internationalen historischen und kunsthistorischen Kongresses in Luxemburg (2006)

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See detailFrüherkennung und Förderung von Problemen im Umgang mit Zahlen bei Kindern von 5-6 Jahren Psychomotorik in Deutschland: Bewegung in Bildung und Gesundheit
Wantz, Marc UL

in Fischer, Klaus; Knab, Eckhart; Behrens, Melanie (Eds.) Früherkennung und Förderung von Problemen im Umgang mit Zahlen bei Kindern von 5-6 Jahren (2006)

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See detailConstitutive Norms in the Design of Normative Multiagent Systems
Boella, Guido; van der Torre, Leon UL

in Computational Logic in Multi-Agent Systems, 6th International Workshop (CLIMA VI) (2006)

In this paper, we consider the design of normative multiagent systems composed of both constitutive and regulative norms. We analyze the properties of constitutive norms, in particular their lack of ... [more ▼]

In this paper, we consider the design of normative multiagent systems composed of both constitutive and regulative norms. We analyze the properties of constitutive norms, in particular their lack of reflexivity, and the trade-off between constitutive and regulative norms in the design of normative systems. As methodology we use the metaphor of describing social entities as agents and of attributing them mental attitudes. In this agent metaphor, regulative norms expressing obligations and permissions are modelled as goals of social entities, and constitutive norms expressing “counts-as” relations are their beliefs. [less ▲]

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See detailSépulture princière et capitale
Pauly, Michel UL

in Margue, Michel (Ed.) Sépulture, mort et symbolique du pouvoir au moyen âge/Tod, Grabmal und Herrschaftsrepräsentation im Mittelalter. Actes des 11es Journées Lotharingiennes (2006)

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See detailA Foundational Ontology of Organizations and Roles
Boella, Guido; van der Torre, Leon UL

in Declarative Agent Languages and Technologies IV, 4th International Workshop (DALT'06) (2006)

In this paper we propose a foundational ontology of the social con- cepts of organization and role which structure institutions. We identify which axioms model social concepts like organization and role ... [more ▼]

In this paper we propose a foundational ontology of the social con- cepts of organization and role which structure institutions. We identify which axioms model social concepts like organization and role and which properties distinguish them from other categories like objects and agents: the organizational structure of institutions, the relation between roles and organizations, and the powers among the components of an organization. All social concepts depend on descriptions defining them, which are collectively accepted, and the description defining the components of organizations, including roles, are included in the description of the organizations they belong to. Thus, the relational dependence of roles means that they are defined in the organizations they belong to. Finally, powers inside organizations are defined by the fact that components of an orga- nization can access the state of the organization whose definition they depend on and of the other components, thus violating the standard encapsulation principle of objects [less ▲]

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See detailFormalisation and Analysis of the Temporal Dynamics of Conditioning
Bosse, T.; Jonker, C.; Los, S. et al

in Agent-Oriented Software Engineering VI (2006)

In order to create adaptive Agent Systems with abilities matching those of their biological counterparts, a natural approach is to incorporate classical conditioning mechanisms into such systems. However ... [more ▼]

In order to create adaptive Agent Systems with abilities matching those of their biological counterparts, a natural approach is to incorporate classical conditioning mechanisms into such systems. However, existing models for classical conditioning are usually based on differential equations. Since the design of Agent Systems is traditionally based on qualitative conceptual languages, these differential equations are often not directly appropriate to serve as an input for Agent System design. To deal with this problem, this paper explores a formal description and analysis of a conditioning process based on logical specification and analysis methods of dynamic properties of conditioning. Specific types of dynamic properties are global properties, describing properties of the process as a whole, or local properties, describing properties of basic steps in a conditioning process. If the latter type of properties are specified in an executable format, they provide a temporal declarative specification of a simulation model. Global properties can be checked automatically for simulated or other traces. Using these methods the properties of conditioning processes informally expressed by Los and Heuvel [8] have been formalised and verified against a specification of local properties based on Machado [9]’s mathematical model [less ▲]

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See detailCollisions of slow highly charged ions with surfaces
Burgdoerfer, J.; Lemell, C.; Schiessl, K. et al

in Fainstein, P.D.; Lima, M.A.P.; Miraglia, J.E. (Eds.) et al Photonic, Electronic and Atomic Collisions, Proceedings of the XXIV International Conference (2006)

Progress in the study of collisions of multiply charged ions with surfaces is reviewed with the help of a few recent examples. They range from fundamental quasi-one electron processes to highly complex ... [more ▼]

Progress in the study of collisions of multiply charged ions with surfaces is reviewed with the help of a few recent examples. They range from fundamental quasi-one electron processes to highly complex ablation and material modification processes. Open questions and possible future directions will be discussed. [less ▲]

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See detailParoles et images de l'immigration: langue, littérature et cinéma, témoins de la présence italienne au Luxembourg et dans la Grande Région. Actes du colloque international, Luxembourg 3-4 juin 2005.
Caldognetto, Maria Luisa; Cicotti, Claudio UL; Reuter, Antoinette UL et al

in Paroles et images de l'immigration: langue, littérature et cinéma, témoins de la présence italienne au Luxembourg et dans la Grande Région. Actes du colloque international, Luxembourg 3-4 juin 2005. (2006)

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See detailBridging Agent Theory and Object Orientation: Importing Social Roles in Object Oriented Languages
Baldoni, Matteo; Boella, Guido; van der Torre, Leon UL

in Programming Multi-Agent Systems, Third International Workshop, ProMAS 2005 (2006)

Social roles structure social institutions like organizations in Multi-Agent Systems (MAS). In this paper we describe how to introduce the notion of social role in programming languages. To avoid the ... [more ▼]

Social roles structure social institutions like organizations in Multi-Agent Systems (MAS). In this paper we describe how to introduce the notion of social role in programming languages. To avoid the commitment to a particular agent model, architecture or language, we decided to extend Java, the most prominent object oriented programming language, by adding social roles. The obtained language allows an easier implementation of MAS’s w.r.t. the Java language. We also show that many important properties of social roles, studied in the MAS field, can be applied to objects. Two are the essential features of social roles according to an analysis reported in the paper: social roles are defined by other entities (called institutions), and when an agent plays a role it is endowed with powers by the institution that defines it. We interpret these two features into the object oriented paradigm as the fact that social roles are objects, which are defined in and exist only inside other objects (corresponding to institutions), and that, through a role, external objects playing the role can access to the object (institution) the role belongs to. [less ▲]

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See detailA Logical Architecture of a Normative System
Boella, Guido; van der Torre, Leon UL

in Deontic Logic and Artificial Normative Systems, 8th International Workshop on Deontic Logic in Computer Science ($$EON'06) (2006)

Logical architectures combine several logics into a more complex logical system. In this paper we study a logical architecture using input/output operations corresponding to the functionality of logical ... [more ▼]

Logical architectures combine several logics into a more complex logical system. In this paper we study a logical architecture using input/output operations corresponding to the functionality of logical components. We illustrate how the architectural approach can be used to develop a logic of a normative system based on logics of counts-as conditionals, institutional constraints, obligations and permissions. In this example we adapt for counts-as conditionals and institutional constraints a proposal of Jones and Sergot, and for obligations and permissions we adapt the input/output logic framework of Makinson and van der Torre. We use our architecture to study logical relations among counts-as conditionals, institutional constraints, obligations and permissions. We show that in our logical architecture the combined system of counts-as conditionals and institutional constraints reduces to the logic of institutional constraints, which again reduces to an expression in the underlying base logic. Counts-as conditionals and institutional constraints are defined as a pre-processing step for the regulative norms. Permissions are defined as exceptions to obligations and their interaction is characterized. [less ▲]

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See detailSymbolizing and modeling to promote a flexible use of the minus sign in algebraic operations
Vlassis, Joëlle UL

in Jarmila, Novotná (Ed.) Proceedings of the 30th International Conference for the Psychology of Mathematics Education (2006)

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See detailAufbau und Strukturprinzipien der öffentlich-rechtlichen Gerichtsbarkeiten – Zur Situation in Luxemburg
Ravarani, Georges UL

in Aufbau und Strukturprinzipien der öffentlich-rechtlichen Gerichtsbarkeiten (2006)

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See detailNon-Linear State-dependent Riccati Equation Control for a Quadrotor UAV
Voos, Holger UL

in IEEE Conference on Control Applications, CCA, Munich, Germany, 2006 (2006)

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See detailDelegation of Power in Normative Multiagent Systems
Boella, Guido; van der Torre, Leon UL

in Deontic Logic and Artificial Normative Systems, 8th International Workshop on Deontic Logic in Computer Science ($$EON'06) (2006)

In this paper we reconsider the definition of counts-as relations in normative multiagent systems: counts-as relations do not always provide directly an abstract interpretation of brute facts in terms of ... [more ▼]

In this paper we reconsider the definition of counts-as relations in normative multiagent systems: counts-as relations do not always provide directly an abstract interpretation of brute facts in terms of institutional facts. We argue that in many cases the inference of institutional facts from brute facts is the result of actions of agents acting on behalf of the normative systems and who are in charge of recognizing which institutional facts follow from brute facts. We call this relation delegation of power: it is composed of a counts-as relation specifying that the effect of an action of an agent is an institutional fact and by a goal of the normative system that the fact is considered as an institutional fact. This relation is more complex than institutional empowerment, where an action of an agent counts-as an action of the normative system but no goal is involved, and than delegation of goals, where a goal is delegated to an agent without giving it any power. With two case studies we show the importance of the delegation of power. Finally, we show how the new definition can be related with existing ones by using different levels of abstraction. [less ▲]

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See detailDesign By Contract Deontic Design Language for Multiagent Systems
Garion, C.; van der Torre, Leon UL

in Coordination, Organizations, Institutions, and Norms in Multi-Agent Systems AAMAS 2005 International Workshops on Agents, Norms, and Institutions for Regulated Multiagent Systems, ANIREM 2005 and on Organizations in Multi-Agent Systems, OOOP 2005 (2006)

Design by contract is a well known theory that views software construction as based on contracts between clients (callers) and suppliers (routines), relying on mutual obligations and benefits made ... [more ▼]

Design by contract is a well known theory that views software construction as based on contracts between clients (callers) and suppliers (routines), relying on mutual obligations and benefits made explicit by assertions. However, there is a gap between this theory and software engineering concepts and tools. For example, dealing with contract violations is realized by exception handlers, whereas it has been observed in the area of deontic logic in computer science that violations and exceptions are distinct concepts that should not be confused. To bridge this gap, we propose a software design language based on temporal deontic logic. Moreover, we show how preferences over the possible outcomes of a supplier can be added. We also discuss the relation between the normative stance toward systems implicit in the design by contract approach and the intentional or BDI stance popular in agent theory. [less ▲]

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See detailMeasuring Changes in Ground Level at Tide Gauges using Continuous GPS and Absolute Gravimetry to Improve Estimates of Changes in Sea Level Around Britain
Bingley, Richard M; Teferle, Felix Norman UL; Dodson, Alan H et al

in Proceedings of the 41st Defra Flodd and Coastal Management Conference 2006 (2006)

Researchers studying climate change have used historical tide gauge measurements from all over the world to investigate the changes in sea level that have occurred over the last century or so. However ... [more ▼]

Researchers studying climate change have used historical tide gauge measurements from all over the world to investigate the changes in sea level that have occurred over the last century or so. However, such estimates are a combination of any true sea level variations and any changes in ground level at the specific tide gauge. For a tide gauge record to be used to determine the climate related changes in sea level it is necessary to correct for any changes in ground level. The development in geodetic techniques for monitoring changes in ground level at British tide gauges has been on-going at the IESSG and POL since 1990, based on research funded by both Defra and the Environment Agency. Since 1996, this research has focused on the establishment of continuous GPS (CGPS) stations and the use of absolute gravity (AG), as independent geodetic techniques for measuring changes in ground level. This paper details the results of Defra/EA R&D project FD2319, which is part of the Risk Evaluation and Understanding of Uncertainty Theme. The paper shows how CGPS and AG have been used on a national scale to monitor changes in ground level at tide gauges and obtain estimates of changes in sea level, decoupled from changes in ground level. [less ▲]

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See detailSesqui-Pushout Rewriting
Corradini, Andrea; Heindel, Tobias; Hermann, Frank UL et al

in Graph Transformation (2006)

Sesqui-pushout (sqpo) rewriting – ''sesqui´´ means ``one and a half'' in Latin – is a new algebraic approach to abstract rewriting in any category. sqpo rewriting is a deterministic and conservative ... [more ▼]

Sesqui-pushout (sqpo) rewriting – ''sesqui´´ means ``one and a half'' in Latin – is a new algebraic approach to abstract rewriting in any category. sqpo rewriting is a deterministic and conservative extension of double-pushout (dpo) rewriting, which allows to model ``deletion in unknown context'', a typical feature of single-pushout (spo) rewriting, as well as cloning. After illustrating the expressiveness of the proposed approach through a case study modelling an access control system, we discuss sufficient conditions for the existence of final pullback complements and we analyze the relationship between sqpo and the classical dpo and spo approaches. [less ▲]

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See detailImproving Approximate Value Iteration Using Memories and Predictive State Representations
James, M. R.; Wessling, T.; Vlassis, Nikos UL

in Proc. National Conf. on Artificial Intelligence (2006)

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See detailAn infinite descending chain of Boolean subfunctions consisting of threshold functions
Lehtonen, Erkko UL

in Proceedings of the Vienna Conference 2005 (AAA70) (2006)

For a class C of Boolean functions, a Boolean function f is a C-subfunction of a Boolean function g, if f=g(h1,...,hn), where all the inner functions hi are members of C. Two functions are C-equivalent ... [more ▼]

For a class C of Boolean functions, a Boolean function f is a C-subfunction of a Boolean function g, if f=g(h1,...,hn), where all the inner functions hi are members of C. Two functions are C-equivalent, if they are C-subfunctions of each other. The C-subfunction relation is a preorder on the set of all functions if and only if C is a clone. An infinite descending chain of U∞-subfunctions is constructed from certain threshold functions (U∞ denotes the clone of clique functions). [less ▲]

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See detailThe Sacralization of Childhood in a Secularized World: Another Paradox in the History of Education? An Exposition of the Problem on the Basis of the open-Air School Diesterweg in Heide-Kalmthout
Thyssen, Geert UL; Depaepe, Marc

in Dillen, Annemie; Pollefeyt, Didier (Eds.) Children’s Voices: Children’s Perspective in Ethics, Theology and Religious Education. Expert Seminar, 11-13 January 2007 (2006)

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See detailGame-Theoretic Foundations for Norms
Boella, Guido; van der Torre, Leon UL

in Procs. of Artificial Intelligence Studies (2006)

In this paper we study game-theoretic foundations for norms. We assume that a norm is a mechanism to obtain desired multi-agent system behavior, and must therefore under normal or typical circumstances be ... [more ▼]

In this paper we study game-theoretic foundations for norms. We assume that a norm is a mechanism to obtain desired multi-agent system behavior, and must therefore under normal or typical circumstances be fulfilled by a range of agent types, such as norm internalizing agents, respectful agents fulfilling norms if pos- sible, and selfish agents obeying norms only due to the associated sanctions. [less ▲]

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See detailOrganizations in Artificial Social Systems
Boella, Guido; van der Torre, Leon UL

in Coordination, Organizations, Institutions, and Norms in Multi-Agent Systems AAMAS 2005 International Workshops on Agents, Norms, and Institutions for Regulated Multiagent Systems, ANIREM 2005 and on Organizations in Multi-Agent Systems, OOOP 2005 (2006)

In this paper we introduce organizations and roles in Shoham and Tennenholtz’ artificial social systems, using a normative system. We model how real agents determine the behavior of organizations by ... [more ▼]

In this paper we introduce organizations and roles in Shoham and Tennenholtz’ artificial social systems, using a normative system. We model how real agents determine the behavior of organizations by playing roles in the organization, and how the organization controls the behavior of agents playing a role in it. We consider the design of an organization in terms of roles and the assignment of agents to roles, and the evolution of organizations. We do not present a complete formalization of the computational problems, but we illustrate our approach by examples. [less ▲]

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See detailLes intérêts précoces et la variable sexe: Effets sur l’intérêt pour les branches sociales et techniques.
Kerger, Sylvie UL; Martin, Romain UL

in Actes de la 17e Journées internationales de psychologie différentielle. (2006)

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See detailDiglwssia kai Glwssiki Metakinisi: Alvanoi mathites sto elliniko scholeio.
Gogonas, Nikolaos UL

in 9th International Conference 'Intercultural Education: Greek as a foreign language" University of Patras, Greece. (2006)

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See detailTowards Translating Graph Transformation Systems by Model Transformation
Kastenberg, Harmen; Hermann, Frank UL; Modica, Tony

in Proc. Int. Workshop on Graph and Model Transformation (GraMoT'06) (2006)

Recently, many researchers are working on semantics preserving model transformation. In the field of graph transformation one can think of translating graph grammars written in one approach to a ... [more ▼]

Recently, many researchers are working on semantics preserving model transformation. In the field of graph transformation one can think of translating graph grammars written in one approach to a behaviourally equivalent graph grammar in another approach. In this paper we translate graph grammars developed with the GROOVE tool to AGG graph grammars by first investigating the set of core graph transformation concepts supported by both tools. Then, we define what it means for two graph grammars to be behaviourally equivalent, and for the regar/ded approaches we actually show how to handle different definitions of both - application conditions and graph structures. The translation itself is explained by means of intuitive examples. [less ▲]

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See detailMultimedia content distribution in hybrid wireless networks using weighted clustering
Andronache, Adrian UL; Brust, Matthias R. UL; Rothkugel, Steffen UL

in Proceedings of the 2nd ACM international workshop on Wireless multimedia networking and performance modeling (2006)

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See detailPrediction of domain-domain interactions using inductive logic programming from multiple genome databases
Nguyen, Thanh-Phuong UL; Ho, Tu Bao

in Lecture Notes in Artificial Intelligence LNAI 4265 (2006)

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See detailLe portfolio au service des compétences transversales
Bernard, H.; Vlassis, Joëlle UL

in Actes du 19e colloque de l'Association pour le Développement des Méthodologies et Evaluation en Education (ADMEE) (2006)

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See detailSecurity and Privacy in the Digital Economy: the Case of Electronic Commerce
Dagorn, Nathalie; Bernard, Nicolas UL

in Proceedings of the IADIS e-Society International Conference (Dublin, 13-16 July 2006) (2006)

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See detailThe Parallel Nash Memory for Asymmetric Games
Oliehoek, Frans A.; de Jong, Edwin D.; Vlassis, Nikos UL

in Proc. Genetic and Evolutionary Computation Conference, Seattle, WA (2006)

Coevolutionary algorithms search for test cases as part of the search process. The resulting adaptive evaluation function takes away the need to define a fixed evaluation function, but may also be ... [more ▼]

Coevolutionary algorithms search for test cases as part of the search process. The resulting adaptive evaluation function takes away the need to define a fixed evaluation function, but may also be unstable and thereby prevent reliable progress. Recent work in coevolution has therefore focused on algorithms that guarantee progress with respect to a given solution concept. The Nash Memory archive guarantees monotonicity with respect to the game-theoretic solution concept of the Nash equilibrium, but is limited to symmetric games. We present an extension of the Nash Memory that guarantees monotonicity for asymmetric games. The Parallel Nash Memory is demonstrated in experiments, and its performance on general sum games is discussed. [less ▲]

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See detailEvaluations of Strategies for Co-Evolutionary Genetic Algorithms: dLCGA Case Study
Danoy, Grégoire UL; Bouvry, Pascal UL; Seredynski, Franciszek

in ANNIE 2006: Proceedings of the 16th international conference on Artificial Neural Networks In Engineering (2006)

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See detailUsing XML Transformations for Enterprise Architectures
Stam, A.; Jacob, J.; de Boer, F. S. et al

in Leveraging Applications of Formal Methods, First International Symposium, ISoLA 2004, Paphos, Cyprus, October 30 - November 2, 2004, Revised Selected Papers (2006)

In this paper we report on the use of XML transformations in the context of Enterprise Architectures. We show that XML transformation techniques can be applied to visualize and analyze enterprise ... [more ▼]

In this paper we report on the use of XML transformations in the context of Enterprise Architectures. We show that XML transformation techniques can be applied to visualize and analyze enterprise architectures in a formal way. We propose transformational techniques to extract views from an XML document containing architectural information and indicate how to perform a specific form of impact analysis on this information. The transformations are formally expressed with the language RML, a compact yet powerful transformation language developed at CWI, which obtains its power from regular expressions defined on XML documents. We discuss a tool that has been built on top of it to visualize the results of the transformations and illustrate the advantages of our approach: the genericity of XML, the application of a single technique (namely XML transformations) for various tasks, and the benefits of having a model viewer which is in complete ignorance of the architectural language used. [less ▲]

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See detailRole-Based Semantics for Agent Communication: Embedding of the `Mental Attitudes' and `Social Commitments' Semantics
Boella, Guido UL; Damiano, R. UL; Hulstijn, Joris UL et al

in Procs. of the 5th International Joint Conference on Autonomous Agents and Multiagent Systems (AAMAS'06) (2006)

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See detailEtat constitutionnel, souveraineté et intégration politique
Heuschling, Luc UL

in Salcedo Castro, Myriam (Ed.) Constitucion e integracion (2006)

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See detailModeling Control Mechanisms with Normative Multiagent Systems: The Case of the Renewables Obligation
Boella, Guido; Hulstijn, J.; Tan, Y. et al

in Coordination, Organizations, Institutions, and Norms in Multi-Agent Systems AAMAS 2005 International Workshops on Agents, Norms, and Institutions for Regulated Multiagent Systems, ANIREM 2005 and on Organizations in Multi-Agent Systems, OOOP 2005 (2006)

This paper is about control mechanisms for virtual organizations. As a case study, we discuss the Renewables Obligation (RO), a control mechanism that was introduced in the United Kingdom to stimulate the ... [more ▼]

This paper is about control mechanisms for virtual organizations. As a case study, we discuss the Renewables Obligation (RO), a control mechanism that was introduced in the United Kingdom to stimulate the production of renewable energy. We apply a conceptual model based on normative multiagent systems (NMAS). We propose to model both the participants and the normative system as autonomous agents, having beliefs and goals. Norms, which can be internalized by the agents as obligations, are translated into conditional beliefs and goals of the normative system, which concern both detection and sanctioning measures. We show that the model can handle both the regulative and the evidential aspects of the case. [less ▲]

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See detailAnalysis of biochemical networks using linear programming
Simeonidis, Vangelis UL; Dartnell, Lewis; Bogle, I. David L. et al

in Proceedings of the 7th World Congress of Chemical Engineering on CD-ROM (2005, December)

The application of mathematical programming methodologies to biochemical systems is demonstrated with the presentation of a linear programming (LP) algorithm for calculating minimal pathway distances in ... [more ▼]

The application of mathematical programming methodologies to biochemical systems is demonstrated with the presentation of a linear programming (LP) algorithm for calculating minimal pathway distances in biochemical networks. Minimal pathway distances are identified as the smallest number of steps separating two nodes in the network. Two case studies are examined: 1) the minimal distances for Escherichia coli Small Molecule Metabolism (SMM) enzymes are calculated and their correlations with genome distance and enzyme function are considered; 2) a study of the p53 cell cycle and apoptosis control network is performed in order to assess the survivability of the network to both random node failures and a directed assault, by studying the modification of the network’s diameter for successive protein knockouts. The results verify the applicability of the algorithm to problems of biochemical nature. [less ▲]

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See detailDistributed Authentication in GRID5000
Varrette, Sébastien UL; Georget, Sebastien; Montagnat, Johan et al

in Proc. of OTM Confederated Int. Workshops on Grid Computing and its Application to Data Analysis (GADA'05) (2005, November)

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See detailDeveloping a taste for quality ? Educationg palates through wine (dis)courses
Reckinger, Rachel UL

in Blogowski, Alain; Lagrange, Louis; Valceschini, Egizio (Eds.) Actes du colloque international SFER (Société Français d’Economie Rurale) : Au nom de la qualité. Quelle(s) qualité(s) demain, pour quelle(s) demande(s)? (2005, October)

‘Exigence de qualité’ et ‘vin’ sont devenus presque des synonymes pour quiconque veut acheter une bouteille. Peu d’autres composants que le vin ne sont convoqués pour juger de la qualité d’ensemble d’un ... [more ▼]

‘Exigence de qualité’ et ‘vin’ sont devenus presque des synonymes pour quiconque veut acheter une bouteille. Peu d’autres composants que le vin ne sont convoqués pour juger de la qualité d’ensemble d’un repas, indiquant un statut similaire du commentaire sur la ‘qualité individuelle’ du vin servi et sur le ‘talent d’ensemble’ de la personne qui a conçu et préparé le repas. Mais qui dit ‘juger’, dit ‘communiquer’, ‘donner un avis’ tant soit peu argumenté – chose délicate, étant donné que les discours sur le vin se sont peu à peu complexifiés et multipliés . D’où le succès public des cours du soir en œnologie, censés enseigner le discernement sur la qualité, si utile lors de la consommation du vin. Mais peut-on parler d’apprentissage de la qualité ? La consommation de vin peut être schématisée en trois étapes actives – en omettant ici l’étape passive de l’encavement domestique : l’achat après une sélection, le service (en général combiné à un repas), et le fait de boire le vin. Quand la filière professionnelle parle de la nécessité d’ « éducation du consommateur », elle fait référence surtout à un aiguisement sensoriel, permettant d’affiner la perception au nez et en bouche de ce produit très nuancé, dans le double but de faire valoir la qualité intrinsèque de vins élaborés dans cet esprit et, en conséquence, d’infléchir les comportements de consommation, plus conscients car formés et informés, dans cette direction . Or, dans la verbalisation de personnes fréquentant des cours du soir en œnologie, c’est précisément cette troisième étape de la consommation qui est majoritairement présentée comme non problématisée. Ce n’est pas la perception sensorielle de la qualité qui soulève des questions aux yeux des buveurs, mais la sélection lors de l’achat, ainsi que le service de vins de qualité, combinés de manière avantageuse à un plat – c’est-à-dire de sorte que la qualité initiale du vin soit manifeste à tous les convives. De plus, le service devient seulement « difficile » quand il a lieu dans une situation publique : avec des invités ou au restaurant – alors que le choix du vin à apprécier en famille se fait « juste comme ça », de lui-même, sans élaboration de discours. Paraît ainsi une distinction opératoire entre ‘qualité en sphère privée’ et ‘qualité en sphère publique’, plus normée et du coup plus subtile à mettre en œuvre. En conformité avec les attentes générales de la filière professionnelle, les œnologues chargé(e)s des cours du soir en œnologie, se positionnant « dans le sens du terroir », entendent – chacun dans son style d’enseignement individuel – à la fois construire et consolider des compétences cognitives et développer des savoir-faire sensoriels. Afin d’atteindre l’objectif consensuel d’une plus grande autonomie « du consommateur », capable de juger et de départir sans aide extérieure, ce sont les capacités de perception et d’évaluation sensorielle de la qualité qui constituent l’outil ultime. Tandis que les connaissances sur le contexte et le mode de production du vin, constituent un savoir en toile de fond, utile seulement dans ses combinaisons pratiques avec des expériences gustatives directes. Mais les personnes fréquentant ces cours sont surtout attentives à l’exposé oral fait par l’œnologue et voient la dégustation (composée de vins aux propriétés sensorielles ‘didactiques’ et ‘démonstratives’, car toujours « typiques » de leur origine) comme un simple agrément. Les questions qui reviennent le plus souvent sont celles de ‘recettes’ toutes faites sur l’achat et le service des vins, dans un désir de transposabilité à l’identique. Les œnologues résistent à ces pressions en prônant l’entraînement sensoriel (« l’on ne peut que recommander aux gens de goûter »), aboutissant à des opinions individuelles – ce dans un cadre qualitatif maîtrisé, tel qu’il a été présenté dans le cours : « après le cours, les gens ont une possibilité de trouver si un vin est bon ou pas bon ». Au terme de cette interaction entre ‘consommateur apprenant’, désireux de se retrouver dans la jungle des vins espérés de qualité, et les chargé(e)s de cours, on pourrait parler de « malentendu culturel » (Pedler, 2004 : 127) diffus. Comme dans d’autres domaines culturels, effectivement « rien n’indique qu’il existe une adéquation entre offres et réceptions cultivées » (idem : 130). Entre le fait d’entendre ‘dire la qualité’ (par l’œnologue) et l’apprendre dans un cours (pour soi), les médiations semblent incertaines, et les inhibitions ne se lèvent qu’à des conditions individuelles particulières. Notamment la famille et la curiosité affranchie sont des incitateurs puissants pour dépasser la renonciation majoritaire d’aller au bout du voyage entamé. Ces facteurs permettent d’aboutir du « j’aime » ou « je n’aime pas » vers un plaisir de découverte, d’expérimentation et d’énonciation du ‘pourquoi’ de la qualité. [less ▲]

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See detailA complete description of comparison meaningful functions
Marichal, Jean-Luc UL; Mesiar, Radko; Rückschlossová, Tatiana

in Montseny, Eduard; Sobrevilla, Pilar (Eds.) Proceedings of the Joint 4th Conference of the European Society for Fuzzy Logic and Technology and the 11th Rencontres Francophones sur la Logique Floue et ses Applications, Barcelona, Spain, September 7-9, 2005. (2005, September)

Comparison meaningful functions acting on some real interval E are completely described as transformed coordinate projections on minimal invariant subsets. The case of monotone comparison meaningful ... [more ▼]

Comparison meaningful functions acting on some real interval E are completely described as transformed coordinate projections on minimal invariant subsets. The case of monotone comparison meaningful functions is further specified. Several already known results for comparison meaningful functions and invariant functions are [less ▲]

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See detailEntropy of bi-capacities
Kojadinovic, Ivan; Marichal, Jean-Luc UL

in Montseny, Eduard; Sobrevilla, Pilar (Eds.) Proceedings of the Joint 4th Conference of the European Society for Fuzzy Logic and Technology and the 11th Rencontres Francophones sur la Logique Floue et ses Applications, Barcelona, Spain, September 7-9, 2005. (2005, September)

The notion of Shannon entropy, recently generalized to capacities, is extended to bi-capacities and its main properties are studied.

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See detailAn extension of the Shannon entropy to bi-capacities
Kojadinovic, Ivan; Marichal, Jean-Luc UL

in Proc. 3rd Int. Summer School on Aggregation Operators and their Applications (AGOP 2005), Lugano, Switzerland, July 10-15, 2005 (2005, July)

The notion of Shannon entropy, recently generalized to capacities, is extended to bi-capacities and its main properties are studied.

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