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See detailA Conviviality Measure for Early Requirement Phase of Multiagent System Design
Caire, Patrice UL; van der Torre, Leon UL

in Normative Multiagent Systems (2009)

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See detailConviviality Measures
Caire, Patrice UL; Alcalde, Baptiste UL; van der Torre, Leon UL et al

in Proc. of 10th Int. Conf. on Autonomous Agents and Multiagent Systems (AAMAS 2011) (2011)

Conviviality has been introduced as a social science concept for multiagent systems to highlight soft qualitative requirements like user friendliness of systems. In this paper we introduce formal ... [more ▼]

Conviviality has been introduced as a social science concept for multiagent systems to highlight soft qualitative requirements like user friendliness of systems. In this paper we introduce formal conviviality measures for dependence networks using a coalitional game theoretic framework, which we contrast with more traditional efficiency and stability measures. Roughly, more opportunities to work with other people increases the conviviality, whereas larger coalitions may decrease the efficiency or stability of these involved coalitions. We first introduce assumptions and requirements, then we introduce a classification, and finally we introduce the conviviality measures. We use a running example from robotics to illustrate the measures. [less ▲]

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See detailConviviality-Driven Access Control Policy
El Kateb, Donia UL; Zannone, Nicola; Moawad, Assaad UL et al

in Requirements Engineering (2014)

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See detailConviviality-driven access control policy
El Kateb, Donia UL; Zannone, N.; Moawad, Assaad UL et al

in Requirements Engineering (2015), 20(4), 363-382

Nowadays many organizations experience security incidents due to unauthorized access to information. To reduce the risk of such incidents, security policies are often employed to regulate access to ... [more ▼]

Nowadays many organizations experience security incidents due to unauthorized access to information. To reduce the risk of such incidents, security policies are often employed to regulate access to information. Such policies, however, are often too restrictive, and users do not have the rights necessary to perform assigned duties. As a consequence, access control mechanisms are perceived by users as a barrier and thus bypassed, making the system insecure. In this paper, we draw a bridge between the social concept of conviviality and access control. Conviviality has been introduced as a social science concept for ambient intelligence and multi-agent systems to highlight soft qualitative requirements like user-friendliness of systems. To bridge the gap between conviviality and security, we propose a methodological framework for updating and adapting access control policies based on conviviality recommendations. Our methodology integrates and extends existing techniques to assist system designers in the derivation of access control policies from socio-technical requirements of the system, while taking into account the conviviality of the system. We illustrate our framework using the Ambient Assisted Living use case from the HotCity of Luxembourg. © 2014, Springer-Verlag London. [less ▲]

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See detailLe coopérateur ouvrier ou la signification du principe de double qualité dans les SCOP
Hiez, David UL

in Revue Internationale de l'Economie Sociale : Recma, Revue des Etudes Coopératives, Mutualistes et Associatives (2006), (299),

Detailed reference viewed: 62 (0 UL)
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See detailLe coopérateur ouvrier ou le principe de double qualité dans les SCOP
Hiez, David UL

in Revue des Etudes Coopératives Mutualistes et Associatives (2006), (299), 34-56

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See detailCooperation and exchange for sustainable urban development
Becker, Tom UL

Scientific Conference (2013, October)

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See detailLa coopération comme « formation transfrontalière de pratiques ». Une perspective d’analyse praxéologique
Wille, Christian UL; Connor, Ulla

Presentation (2018)

Les développements sociétaux récents ont remis la question de la frontière sur l'agenda scientifique. Dans un contexte de montée du populisme, de BREXIT ou de mouvements migratoires, différentes ... [more ▼]

Les développements sociétaux récents ont remis la question de la frontière sur l'agenda scientifique. Dans un contexte de montée du populisme, de BREXIT ou de mouvements migratoires, différentes disciplines activent des concepts nouveaux ou déjà éprouvés pour saisir les réalités contemporaines et pour repenser le projet européen, respectivement les frontières nationales. A cet effet, de plus en plus d’approches constructivistes prévalent, décentralisant le regard analytique de la frontière nationale en tant qu'objet ontologique aux processus de démarcation et de différenciation. Le décentrement méthodologique de la frontière en faveur des réalités sociétales de frontiérisation (bordering) a été reçu de manière productive au sein des border studies et s’est établi comme tournant praxéologique (practice turn). Ce développement n’a pas encore trouvé d’écho significatif au sein de la recherche sur la coopération transfrontalière. C’est pourquoi la présente communication propose d’analyser la coopération transfrontalière dans une perspective praxéologique. Celle-ci ne se limite pas à des systèmes ou structures, des frontières territoriales ou des normativités d’action en tant que facteurs explicatifs des dynamiques de la coopération transfrontalière ; au contraire, elle est centrée sur les réalités immédiates et contingentes de la coopération. La coopération sera donc conçue comme une « formation transfrontalière de pratiques », c.-à-d. comme un ensemble complexe de pratiques politiques et administratives interdépendantes dépassant une frontière nationale. De telles formations ne représentent pas des entités uniquement formées ; elles sont plutôt dynamiques et à caractère relationnel puisqu’elles sont constamment actualisées et en conséquence re/produites. Ces processus sociaux de mise à jour constituent les réalités de la coopération sur lesquelles porte l'intérêt d’une analyse praxéologique. Cette dernière ne construit donc pas la coopération transfrontalière comme un « objet entre-deux » situé entre différents systèmes politiques et administratifs. Il s’agit plutôt de développer une approche centrée sur les pratiques qui attribue à la coopération une identité propre. Pour ce faire, la présente communication, axée sur des questions théoriques, (1) donne un aperçu des hypothèses praxéologiques ; (2) présente ensuite la notion de « formation transfrontalière de pratiques » et (3) développe sur base de l'exemple des défis de coopération une perspective praxéologique sur la coopération transfrontalière. Enfin, (4) cette communication présentera quelques-unes des particularités méthodologiques liées à la perspective d’analyse proposée. La présente communication propose de sensibiliser à de nouvelles modalités d’analyse et de questionner les prémisses implicites de la recherche traditionnelle sur la coopération. En outre, la présente communication veut soumettre au débat une approche de connexions multidisciplinaires qui s’inscrit dans les développements récents au sein des border studies. [less ▲]

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See detailCoopération franco-américaine dans le cadre du Forum non conveniens : Note sous Paris, 6 mars 2008
Cuniberti, Gilles UL

in Journal du Droit International (2009)

Forum non conveniens et action en incompétence par voie d’action.

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See detailLa coopération transfrontalière comme formation de pratiques. Perspectives pour une approche de recherche alternative
Wille, Christian UL; Connor, Ulla UL

in Dziub (Ed.) Le Transfrontalier, pratiques et représentations (in press)

In order to achieve our objective, we will first provide an overview of the development of cooperation research, its characterizing orientations and establish a link to the topic of this contribution ... [more ▼]

In order to achieve our objective, we will first provide an overview of the development of cooperation research, its characterizing orientations and establish a link to the topic of this contribution (chapter 2). The following presentation of practice theories introduces praxeo-logical thinking and provides a condensed outline of the state of the art of this cultural soci-ological theory (chapter 3). Building on this, we will develop our idea of a cross-border practice formation that breaks with the premises of traditional cooperation research, and we provide an alternative perspectivation by outlining four challenges of CBC (chapter 4). In consideration of some research-practical particularities which are linked to the suggested analytical perspective, we eventually offer (chapter 5) an outlook on the development of an alternative research approach which is compatible within a multidisciplinary context. [less ▲]

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See detailCoopération transfrontalière des universités dans l’espace SaarLorLux
Lehners, Jean-Paul UL

in Schmeling, Manfred; Veith, Michael (Eds.) Universitäten in europäischen Grenzräumen / Universités et Frontières en Europe. Frankreich-Forum. Jahrbuch des Frankreichzentrums der Universität des Saarlandes (2005)

Detailed reference viewed: 57 (0 UL)
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See detailLa coopération transfrontalière, un levier potentiel des réconciliations interethniques en ex-Yougoslavie ? Une approche critique
Blondel, Cyril UL

in Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography (2013)

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See detailCoopération, Sécurité, Paix et Développement durable : Quelle nouvelle stratégie des Systèmes d'Alerte précoce (SAP) de la troisième génération pour plus d'efficacité dans la prévention et gestion des conflits violents?
Nadialine, Biagui Alexandre UL

Doctoral thesis (2019)

The atrocities associated with the wars in the Balkans in the 1990s and the Rwandan genocide represent a critical period leading to the questioning of the relevance of Conflict Early Warning Systems (CEWS ... [more ▼]

The atrocities associated with the wars in the Balkans in the 1990s and the Rwandan genocide represent a critical period leading to the questioning of the relevance of Conflict Early Warning Systems (CEWS), which purpose consists in preventing violent conflicts. On the one hand, the supporters of these mechanisms are enthusiatic about the invaluable contributions of CEWS and the notion that these mechanisms are crucial in understanding the underlying causes and dynamics of violent conflicts in order to enable their prevention, resolution and peaceful transformation. The critics, on the other hand, believe that these mechanisms are incapable of fulfilling their assigned mission. Thus, in order to fully understand these mechanisms and to verify the validity of the argument supporting their modest contribution in the process of preventing violent conflicts, a large-scale literature review was undertaken. With regards to all generations of CEWS, from 1990 to 2016, the main objective consisted in identifying difficulties in the literature and recommendations for the improvement of these mechanisms. Considering that CEWS and response mechanisms interact constantly, identifying difficulties and recommendations related to response mechanisms for the same time period in the relevant literature was also a focus. In order to strengthen our investigation, a focus-group with CEWS practitioners was held in March 2018 in Senegal. With regard to the online literature review, a search strategy was set up. It allowed the exploration of several documents from a variety of sources. As for the focus-group, inclusion criteria for participant’s selection were also defined. On the one hand, 14504 documents were explored, of which 259 thoroughly reviewed, of which 153 were selected. In addition, 20 other so-called mixed documents, focusing on the main concepts of the thesis (5 documents per concept) were selected. On the other hand, 5 participants took part in the focus-group. As for the online literature review’s results, several types of difficulties and recommendations related to CEWS and response mechanisms were identified and divided into categories and sub-categories. Similarly, with regard to the focus-group’s results, several types of difficulties and recommendations related to CEWS and response mechanisms were identified and dispatched into the corresponding categories and sub-categories. Consequently, a compendium of difficulties and recommendations related to CEWS and response mechanisms from 1990 to 2016 was established. By associating the Maxqda software to the document and content analysis methods, the two types of data (review and empirical) were valorized through the principal of inference. A cross-analysis of these two types of data made it possible to invalidate and confirm the existence of certain failures, but also to confirm the persistence of several difficulties that CEWS and response mechanisms face. A critical analysis of these mechanisms has demonstrated that, despite their contributions and progress, much work is still to be done, especially when it comes to the collection and management of information for early warning purposes. Indeed, the failure to take into account a number of technical issues could have negative effects on the whole Collection-Verification-Transmission-Analysis-Referal process (CVTAR) and on the management of intra- or inter-state conflicts. Thus, with regard to the later, the geopolitical and geostrategic game dictating the outcome of international mediation degrades its image by promoting a distorted and selfish culture of violent conflicts prevention. As a result, such flaws have prompted the formulation of alternative and relevant strategies with the aim of optimazing the effectiveness of violent conflict prevention and management. In addition to theoretical and practical contributions, the provision of a product, currently under conceptualization, to a federal structure of CEWS and response mechanisms at the national level, promises an invaluable contribution to social unrests and/ or violent conflicts prevention, but also a transparent management of public affairs and the promotion of good governance. [less ▲]

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See detailA Cooperative Advanced Driver Assistance System to Mitigate Vehicular Traffic Shock Waves
Forster, Markus UL; Frank, Raphaël UL; Gerla, Mario et al

in IEEE INFOCOM 2014 - IEEE Conference on Computer Communications (2014)

We address the problem of shock wave formation in uncoordinated highway traffic. First, we identify the combination of heavy traffic and small traffic perturbations or unexpected driver actions as the ... [more ▼]

We address the problem of shock wave formation in uncoordinated highway traffic. First, we identify the combination of heavy traffic and small traffic perturbations or unexpected driver actions as the main causes of highway traffic jams. Then we introduce a novel distributed communication protocol that enables us to eliminate upstream shock wave formation even with low system penetration rates. Based on traffic information ahead, we propose a Cooperative Advanced Driver Assistance System (CADAS) that recommends non-intuitive velocity reductions in order to redistribute traffic more uniformly thereby eliminating traffic peaks. Simulation results show that CADAS significantly increases the average velocity and therewith reduces the overall travel time and avoids unnecessary slowdowns. [less ▲]

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See detailCooperative and Cognitive Satellite Systems
Chatzinotas, Symeon UL; Ottersten, Björn UL; DeGaudenzi, Riccardo

Book published by Elsevier (2015)

Detailed reference viewed: 341 (21 UL)
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See detailCooperative and Mobile Learning in Ad-Hoc Networks
Brust, Matthias R. UL; Rothkugel, Steffen UL

in Proceedings of World Conference on Engineering and Technology Education (WCETE 2004) (2004)

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See detailCooperative cognitive networks: Optimal, distributed and low-complexity algorithms
Zheng, Gan UL; Song, Shenghui; Wong, Kai-Kit et al

in IEEE Transactions on Signal Processing (2013), 11(61), 2778-2790

This paper considers the cooperation between a cognitive system and a primary system where multiple cognitive base stations (CBSs) relay the primary user's (PU) signals in exchange for more opportunity to ... [more ▼]

This paper considers the cooperation between a cognitive system and a primary system where multiple cognitive base stations (CBSs) relay the primary user's (PU) signals in exchange for more opportunity to transmit their own signals. The CBSs use amplify-and-forward (AF) relaying and coordinated beamforming to relay the primary signals and transmit their own signals. The objective is to minimize the overall transmit power of the CBSs given the rate requirements of the PU and the cognitive users (CUs). We show that the relaying matrices have unity rank and perform two functions: Matched filter receive beamforming and transmit beamforming. We then develop two efficient algorithms to find the optimal solution. The first one has a linear convergence rate and is suitable for distributed implementation, while the second one enjoys superlinear convergence but requires centralized processing. Further, we derive the beamforming vectors for the linear conventional zero-forcing (CZF) and prior zero-forcing (PZF) schemes, which provide much simpler solutions. Simulation results demonstrate the improvement in terms of outage performance due to the cooperation between the primary and cognitive systems. [less ▲]

Detailed reference viewed: 109 (1 UL)