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See detailD2.1 The Specification and Overall Requirements of the eGlasses Platform
McCall, Roderick UL; Louveton, Nicolas UL; Rumiński, Jacek

Report (2014)

The purpose of this document is to review the requirements of the platform in terms of human factors issues that to be addressed, provide an update on the state of the art in augmented reality ... [more ▼]

The purpose of this document is to review the requirements of the platform in terms of human factors issues that to be addressed, provide an update on the state of the art in augmented reality requirements and to provide an early technical specification. Addressing these issues will ensure that the platform can deliver its full potential when actually operated by the end-users. Indeed, a poorly designed system will not only reduce utility and acceptance of the platform but also induce discomfort and frustration. The document keeps the requirements at a general level as it does not support specific use-case implementations. Instead this document provides a list of general specifications and requirements that must be addressed in order for the eGlasses platform to be a success. [less ▲]

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See detailFinal report of the effectiveness study in Virtual Coach Reaches Out to me project
Aleksic, Gabrijela UL; Roelofsma, Peter

Report (2014)

One out of three persons in our society suffers from social or emotional loneliness. This percentage is even higher in the population of people who suffer from chronic diseases. Loneliness has pervasive ... [more ▼]

One out of three persons in our society suffers from social or emotional loneliness. This percentage is even higher in the population of people who suffer from chronic diseases. Loneliness has pervasive effects on mental health but it also has negative effects on physical well-being. The aim of this paper is to present a series of pilot studies evaluating the development of an ambient virtual coaching system. This system, called V2me (Virtual Coach reaches Out to Me) offers a friendship enrichment course for people in need for improving their social network. Several pilot studies were performed with about 50 participants in total who evaluated the system that was developed using a living lab approach. In this approach new health media was developed from a user-centered process that allows frequent iterations of user evaluation and involvement. The paper presents the results of the first five iterations. The reactions on receiving the system and experiences during instruction were increasingly positive over these iterations of the system development phase. Over time the system has passed the user’s choice selection criteria. Participants have been expressing a clear interest for choosing and wanting to use the system in their daily lives. However, the system did not pass the persistent use selection criteria when the system was brought and left for independent use. It appeared that participants did not use it very much during the day as expected. Moreover, participants did not perform all the tasks (i.e., messaging, Skyping) that they were asked to achieve on a daily basis. The final goal of the V2me system, i.e. establishing social relations between elderly persons, was not achieved as well, although this might be due to the limited time space of using the system and its facilities. Given these observation, it is concluded that more iterations in the system development are needed for the system in order to pass the habitual use criteria which is needed for its effectiveness. [less ▲]

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See detailMIGRANT ACCESS TO SOCIAL SECURITY: POLICIES AND PRACTICE IN LUXEMBOURG
Sommarribas, Adolfo UL; Besch, Sylvain; Baltes-Löhr, Christel UL

Report (2014)

The social security system in Luxembourg is in principle a contributory-based system different to other countries, which have a residence-based system. The social protection system is composed of three ... [more ▼]

The social security system in Luxembourg is in principle a contributory-based system different to other countries, which have a residence-based system. The social protection system is composed of three major branches: a) Social security: This branch comprehends healthcare, sick cash benefits, maternity and paternity leave benefits, accidents at work and occupational diseases, long-term care, invalidity benefits, old-age pensions, survivors’ pensions and family allowances. The social security benefits are financed by contributions paid either by the employer, the employee or the State. We include in this branch unemployment because the employee contributes to the system. The only requirements that the beneficiary has to fulfill are the objective criteria for granting each one of the benefits. b) Social assistance system: This branch comprehends the guaranteed minimum income (RMG), which is financed by general taxation and is paid from the general budget of the State. The persons have to prove that they do not have sufficient means to live when their income does not reach a certain threshold. c) Social aid: This is considered the safety net of the system. This aid allows people in need and their families to have a life in dignity. As the social assistance system it is financed by general taxation and in principle any person residing in Luxembourg can benefit from it if s/he fulfills the criteria. This benefit is granted and distributed by the social assistance offices of the municipalities. [less ▲]

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See detailReport on the results of the UGC Thematic Task Force
Wieneke, Lars UL; Hazan, Susan

Report (2014)

The Europeana UGC Thematic Task Force was instigated as an initiative of Europeana network members to provide a deeper understanding about the current practices of user generated content (UGC) and to ... [more ▼]

The Europeana UGC Thematic Task Force was instigated as an initiative of Europeana network members to provide a deeper understanding about the current practices of user generated content (UGC) and to identify inter‐project services and practices that could become shared building blocks for the creation of a Europeana UGC ecosystem. [less ▲]

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See detailLe management humain face à la distanciation – Etat de l’art théorique et empirique
Constantinidis, Christina UL; Rousseau, Anne; Taskin, Laurent

Report (2014)

Detailed reference viewed: 54 (0 UL)
See detailPérimètre RH et rôle(s) des line managers, Etat de l’art et recherche empirique
Constantinidis, Christina UL; Nils, Frédéric; Rousseau, Anne et al

Report (2014)

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See detailOn the verifiability of (electronic) exams
Dreier, Jannik; Giustolisi, Rosario; Kassem, Ali et al

Report (2014)

The main concern for institutions that organize exams is to detect when students cheat. Actually more frauds are possible and even authorities can be dishonest. If institutions wish to keep exams a ... [more ▼]

The main concern for institutions that organize exams is to detect when students cheat. Actually more frauds are possible and even authorities can be dishonest. If institutions wish to keep exams a trustworthy business, anyone and not only the authorities should be allowed to look into an exam’s records and verify the presence or the absence of frauds. In short, exams should be verifiable. However, what verifiability means for exams is unclear and no tool to analyze an exam’s verifiability is available. In this paper we address both issues: we formalize several individual and universal verifiability properties for traditional and electronic exams, so proposing a set of verifiability properties and clarifying their meaning, then we implement our framework in ProVerif, so making it a tool to analyze exam verifiability. We validate our framework by analyzing the verifiability of two existing exam systems – an electronic and a paper-and-pencil system. [less ▲]

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See detailEducation and Social Progress in Switzerland
Samuel, Robin UL; Bergman, Manfred Max

Report (2014)

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See detailLes oeuvres complètes de Laurent Menager
Sagrillo, Damien UL; Nitschké, Alain UL

Report (2013)

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See detailSuburbaner Raum im Lebenszyklus
Reicher, Christa; Hesse, Markus UL

Report (2013)

The central part of the study deals with the question of how to approach the temporarily differentiated development dynamics of suburban spaces within a systematic, conceptual analysis framework. The ... [more ▼]

The central part of the study deals with the question of how to approach the temporarily differentiated development dynamics of suburban spaces within a systematic, conceptual analysis framework. The temporal variation and trajectory analysis however remains descriptive in this study, as the method still has not been developed into an autonomous explanatory system. The study concentrates on the integration of the particular phases and cycles into a broader context of the suburban system and - as far as possible - to describe interdependencies of trigger factors as well as of the local and regional framework. This makes the approach different to a static spatial analysis. Those phases contain, in most cases, the Growth, Maturity, Transition and Resiliency. The latter describes the capability of a system to encounter decline or even to reach a development turn. The phases develop into cycles when temporal periodic changes occur, following a certain logic determined by definable factors and strategies. [less ▲]

Detailed reference viewed: 121 (2 UL)
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See detailResearch & Innovation: Which priorities for structural funds in Luxembourg
Evrard, Estelle UL; Hachmann, Verena UL; Schulz, Christian UL

Report (2013)

It is a key aim of the EU2020 strategy and of the Luxembourg government to promote research and innovation (“smart growth”). The 2014-2020 programming period of the Structural Funds offers an opportunity ... [more ▼]

It is a key aim of the EU2020 strategy and of the Luxembourg government to promote research and innovation (“smart growth”). The 2014-2020 programming period of the Structural Funds offers an opportunity to support projects in this field at national, cross-border and transnational levels. This leaflet synthesises the results of a consultation process organised by the ESPON Contact Point of Luxembourg in summer and autumn 2013 in the framework of the USESPON project. First, it aimed at analysing the relevance of ESPON results in the field of research, development and innovation (RDI) in Luxembourg. Second, this process reflected on possible priorities for the future operational programmes of the structural funds. This process involved either experts in the field of RDI or those responsible for drafting operational programmes. The consultation process has been framed by a Delphi technique. First, participants received “support material” presenting the situation of Luxembourg according to the ESPON results. Second, they participated in a workshop on 11th July 2013. Third, a synthesis based on the results of the workshop was provided together with a questionnaire giving the experts the opportunity to deepen and concretise their contribution. By summarising this consultation process, this leaflet aims at 1) working out a profile of Luxembourg on the basis of ESPON results in the field of RDI and 2) developing recommendations of how future-oriented innovation strategies can be implemented in the context of European Territorial Cooperation. The final version of this document was published on the ECP Luxembourg website in autumn 2013. [less ▲]

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See detailWolfgang Suppan und die Blasmusikforschung
Sagrillo, Damien UL

Report (2013)

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See detailAn empirical analysis of heavy-tails behavior of financial data: the case for power laws
Champagnat, Nicolas; Deaconu, Madalina; Lejay, Antoine et al

Report (2013)

This work aims at underlying the importance of a correct modelling of the heavy-tail behavior of extreme values of financial data for an accurate risk estimation. Many financial models assume that prices ... [more ▼]

This work aims at underlying the importance of a correct modelling of the heavy-tail behavior of extreme values of financial data for an accurate risk estimation. Many financial models assume that prices follow normal distributions. This is not true for real market data, as stock (log-)returns show heavy-tails. In order to overcome this, price variations can be modeled using stable distribution, but then, as shown in this study, we observe that it over-estimates the Value-at-Risk. To overcome these empirical inconsistencies for normal or stable distributions, we analyze the tail behavior of price variations and show further evidence that power-law distributions are to be considered in risk models. Indeed, the efficiency of power-law risk models is proved by comprehensive backtesting experiments on the Value-at-Risk conducted on NYSE Euronext Paris stocks over the period 2001-2011. [less ▲]

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See detailSecurity Analysis of the Block Cipher SC2000
Biryukov, Alex UL; Nikolic, Ivica

Report (2013)

Detailed reference viewed: 73 (2 UL)
See detailFrom SOLOIST to CLTLB(D): Checking quantitative properties of service-based applications
Bianculli, Domenico UL; Krstic, Srđan; Ghezzi, Carlo et al

Report (2013)

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See detailGuidelines for the dissemination of ESPON results in different spatial contexts
Hohmann, Kirsten; Schmidt-Seiwert, Volker; Schön, Karl Peter et al

Report (2013)

From 2010 to 2013, the ESPON Contact Points (ECPs) from Austria, Germany, Hungary, Luxembourg and Switzerland/Liechtenstein worked together on the project “Breakdown and capitalisation of ESPON results on ... [more ▼]

From 2010 to 2013, the ESPON Contact Points (ECPs) from Austria, Germany, Hungary, Luxembourg and Switzerland/Liechtenstein worked together on the project “Breakdown and capitalisation of ESPON results on different scales/SCALES”. This report presents different sets of strategies to facilitate the transferability of ESPON results on various territorial levels. [less ▲]

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See detailRapport politique sur les migrations et l’asile 2012 - Luxembourg
Baltes-Löhr, Christel UL; Sommarribas, Adolfo UL; Li, Lisa et al

Report (2013)

Le rapport politique sur les migrations et l’asile destiné au Réseau Européen des Migrations donne un aperçu des principaux débats politiques et développements dans ce domaine au Luxembourg au cours de ... [more ▼]

Le rapport politique sur les migrations et l’asile destiné au Réseau Européen des Migrations donne un aperçu des principaux débats politiques et développements dans ce domaine au Luxembourg au cours de l’année 2012. Si plusieurs sujets ont dominé le débat politique général comme la gestion de la crise économique, la réforme du système de pensions, ou encore la réforme du système d’enseignement, ces questions ont été thématisées le plus souvent sans qu’un lien ne soit établi avec la situation démographique particulière du Luxembourg caractérisée d’une part, par une population composée de 43% de non-nationaux et un emploi intérieur dont la maind’oeuvre étrangère, résidente ou transfrontalière, représente 68,5%. Dans ce contexte, trois thématiques ont dominé le débat politique en 2012 - les flux migratoires en relation avec la libre circulation des citoyens de l’Union européenne, l’accueil et l’aide sociale des demandeurs de protection internationale et le débat sur la réforme de la loi sur la nationalité. [less ▲]

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See detailÉtablissement de l'identité pour la protection internationale: Défis et pratiques
Sommarribas, Adolfo UL; Koch, Anne UL; Baltes-Löhr, Christel UL

Report (2012)

L'objectif principal de la Convention de Genève et de la directive 2004/83/CE est d'accorder l'asile et la protection subsidiaire (protection internationale) aux personnes qui ont réellement besoin de ... [more ▼]

L'objectif principal de la Convention de Genève et de la directive 2004/83/CE est d'accorder l'asile et la protection subsidiaire (protection internationale) aux personnes qui ont réellement besoin de protection, d'assurer que tous les États membres appliquent des critères communs pour l'identification des personnes ainsi que d'assurer un niveau minimal d'avantages à ces personnes dans tous les États membres. Afin de décider si un demandeur remplit les conditions pour bénéficier de la protection internationale, les autorités nationales doivent prendre en compte tous les éléments présentés lors de la demande. Un élément essentiel de toute demande est l'identité et/ou la nationalité du demandeur de protection internationale, permettant aux autorités d’évaluer les déclarations du demandeur par rapport aux raisons pour demander la protection internationale, et éviter ainsi l'octroi du statut de protection internationale aux personnes qui ne remplissent pas les conditions requises ou qui utilisent abusivement le système d'asile pour d’autres raisons, p.ex. de nature économique. Au Luxembourg, la procédure de vérification/établissement de l'identité dans le cadre de la protection internationale est séparée de la procédure de prise de décision en tant que telle. Alors que le pouvoir d'accorder le statut de protection internationale incombe au Ministère de l'Immigration, la Police judiciaire est chargée de la vérification/l'établissement de l'identité (article 8 de la Loi du 5 mai 2006 sur le droit d'asile). À cet effet, le demandeur est interrogé sur son itinéraire de voyage, y compris sur le passage de la frontière et les moyens de transports utilisés pour arriver au Luxembourg. [less ▲]

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See detailAbus du droit au regroupement familial: mariages de complaisance et fausses déclarations de parenté
Sommarribas, Adolfo UL; Besch, Sylvain; Baltes-Löhr, Christel UL

Report (2012)

Les mariages de complaisance représentent un phénomène rencontré dans plusieurs sociétés, étant cependant très controversé dans la société occidentale. L’institution du mariage a changé depuis l’entrée en ... [more ▼]

Les mariages de complaisance représentent un phénomène rencontré dans plusieurs sociétés, étant cependant très controversé dans la société occidentale. L’institution du mariage a changé depuis l’entrée en vigueur du Code civil luxembourgeois le 27 mars 1808. Les mariages de complaisance peuvent être utilisés, par les ressortissants de pays tiers, comme un moyen de contourner les obstacles pour entrer dans l’Union européenne en prétextant le regroupement familial. Les voies légales de migration se font rares puisque la législation sur la migration des ressortissants de pays tiers vers l’Union européenne est devenue plus restrictive. Globalement, il n’existe que deux voies légales pour les ressortissants de pays tiers qui ne correspondent pas à l’image de la migration que le Luxembourg promeut (migrations des travailleurs et chercheurs hautement qualifiés) mais qui restent valables : la protection internationale et le regroupement familial. Le droit d’asile et le droit à la vie familiale sont des droits fondamentaux que les États membres ne peuvent pas restreindre sans une approche proportionnelle fait conforme à plusieurs reprises par la Cour Européenne des Droits de l’Homme. [less ▲]

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See detailProfils individuels et trajectoires migratoires de travailleurs frontaliers ressortissants de pays tiers – le cas du Luxembourg
Baltes-Löhr, Christel UL; Sommarribas, Adolfo UL; Monteiro, Joaquim UL

Report (2012)

Selon l’historien luxembourgeois Gilbert Trausch, le Grand-Duché est devenu une terre d’immigration avec son industrialisation, aux environ de 1871 . Depuis, la présence d’étrangers demeure un trait ... [more ▼]

Selon l’historien luxembourgeois Gilbert Trausch, le Grand-Duché est devenu une terre d’immigration avec son industrialisation, aux environ de 1871 . Depuis, la présence d’étrangers demeure un trait caractéristique de l’histoire sociale du pays et la pierre angulaire de ses politiques migratoires. Un des aspects plus récents de cette politique nationale migratoire a été de, à partir des années 90 , recourir à une main-d’œuvre frontalière. En effet, la Grande Région, qui se compose du Luxembourg, la Sarre et de la région Rhin-Palatinat (Allemagne), de la Lorraine (France) et de la Wallonie (Belgique), représente le plus grand espace politique transnational d’Europe et compte près de 25% de la totalité des TF dans l’UE-27, figurant ainsi à la 2e place, derrière la Suisse . Bien que, historiquement, on puisse retracer ses dynamiques et réseaux jusqu’à la période romaine et même au-delà , ce n’est qu’à partir des années 90 que la croissance d’espaces frontaliers devient progressivement visible en Europe. Pour ce qui est du Luxembourg, le nombre de TF a augmenté de façon continue au cours de ces années, pour finalement représenter près de 42% de la main-d’œuvre nationale en 2010 . En outre, pour la même année de référence, la part des ressortissants luxembourgeois dans la main-d’œuvre totale se limitait à 29% . En d’autres termes, si 100 emplois étaient disponibles sur le marché du travail, 27 ont été occupés par des résidents étrangers, 29, par des ressortissants luxembourgeois et 44, par des TF . La présente étude se concentre sur les TF-RPT. En effet, s’il est vrai que les TF ont fait l’objet de nombreuses études en raison notamment, de leur importance pour le marché de l’emploi, les TF-RPT ont, quant à eux, été largement ignorés dans le débat public jusqu’à présent. [less ▲]

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See detailImmigration des étudiants internationaux vers l’UE - Luxembourg
Sommarribas, Adolfo UL; Besch, Sylvain; Baltes-Löhr, Christel UL et al

Report (2012)

Jusqu’en 2003, le Luxembourg n’avait pas d’université. Avant cette date, la formation de l’élite du pays avait lieu dans des universités étrangères, en particulier dans les universités et établissements ... [more ▼]

Jusqu’en 2003, le Luxembourg n’avait pas d’université. Avant cette date, la formation de l’élite du pays avait lieu dans des universités étrangères, en particulier dans les universités et établissements d’enseignement supérieur de la Grande Région (Belgique, France et Allemagne). Seules certaines années d’enseignement supérieur pouvaient être suivies dans quatre établissements d’enseignement supérieur, ou dans certains établissements étrangers qui mettent en place des programmes spéciaux dans le pays (en particulier dans le domaine de la gestion d’entreprise). Cette situation a commencé à changer avec la transformation de l’économie luxembourgeoise passant d’une économie industrialisée à une économie centrée sur les secteurs des services et financiers. Le besoin en personnel qualifié et hautement qualifié ne pouvant être satisfait par la population locale a forcé le Luxembourg à continuer à dépendre du réservoir de ressources humaines de la Grande Région. L’éventuel problème de cette situation était que ce réservoir n’est pas illimité et que certaines des qualifications requises ne pouvaient pas être remplies par cette population active que l’on ne pouvait trouver qu’à l’étranger. De plus, un grand nombre d’étudiants nationaux ayant reçu un enseignement et une formation à l’étranger ont fait carrière à l’extérieur du pays. Ce sont quelques-uns des éléments pris en compte par le gouvernement luxembourgeois pour créer l’Université du Luxembourg. Ses principaux objectifs sont que l’université réponde aux besoins et aux exigences du monde académique moderne et qu’elle puisse être suffisamment flexible pour s’adapter aux réalités sociales et économiques du pays. L’Université du Luxembourg s’est centrée sur la recherche et sur une éducation de haut niveau, à vocation internationale (« ouverte au monde ») encourageant le multilinguisme et l’inter-mobilité de tous ses étudiants y compris des ressortissants de pays tiers. [less ▲]

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See detailEstablishing identity for international protection: challenges and practices
Sommarribas, Adolfo UL; Koch, Anne UL; Besch, Sylvain

Report (2012)

In Luxembourg, the procedure for identity verification/establishment in the context of international protection is separated from the decision-making procedure as such. While the authority for granting ... [more ▼]

In Luxembourg, the procedure for identity verification/establishment in the context of international protection is separated from the decision-making procedure as such. While the authority for granting international protection status lies with the Ministry of Immigration, the Judicial Police is in charge of identity verification/establishment (Article 8 of Law of 5 May 2006). For this means, the applicant will be interviewed with regard to his/her travel itinerary, including questions on border crossing and used means of transports to arrive in Luxembourg. [less ▲]

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See detailImmigration of International Students to the EU - Luxembourg
Sommarribas, Adolfo UL; Baltes-Löhr, Christel UL; Besch, Sylvain

Report (2012)

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See detailMigration und Integration in der Kreisstadt Merzig, Abschlussbericht
Nienaber, Birte UL; Roos, Ursula

Report (2012)

Zunächst wird der derzeitige Forschungsstand in Bezug auf die Migrations- und Integ-rationsforschung im ländlichen Kontext sowie die Theorie des Integrationsbegriffs vorgestellt. Es schließen sich die ... [more ▼]

Zunächst wird der derzeitige Forschungsstand in Bezug auf die Migrations- und Integ-rationsforschung im ländlichen Kontext sowie die Theorie des Integrationsbegriffs vorgestellt. Es schließen sich die Charakterisierung der Kreisstadt Merzig, die Beschreibung des methodischen Vorgehens und die Darstellung der Untersuchungsergebnisse an. Aus den Untersuchungsergebnissen, die lediglich eine Momentaufnahme liefern, werden abschließend Handlungsempfehlungen für die Kreisstadt Merzig abgeleitet [less ▲]

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See detailA Logic of Interactive Proofs
Kramer, Simon UL

Report (2012)

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See detailVisa policy as a migration channel
Sommarribas, Adolfo UL; Baltes-Löhr, Christel UL; Besch, Sylvain

Report (2011)

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See detailRapport politique sur les migrations et l’asile 2010 - Luxembourg
Baltes-Löhr, Christel UL; Koch, Anne UL; Besch, Sylvain

Report (2011)

L’année 2010 a été fortement marquée par le contexte de la crise économique et financière, déclenchée au cours du premier trimestre 20082, ainsi que par les propositions de réformes du Gouvernement pour y ... [more ▼]

L’année 2010 a été fortement marquée par le contexte de la crise économique et financière, déclenchée au cours du premier trimestre 20082, ainsi que par les propositions de réformes du Gouvernement pour y faire face. Etant donné ce contexte de crise, il faut souligner qu’en termes de préoccupation politique générale, le domaine de la migration, de l’asile et de l’intégration a plutôt joué un rôle secondaire comparé à d’autres domaines. Nonobstant, le domaine des migrations a fait l’objet de quelques débats politiques importants en 2010, liés soit à des changements législatifs, soit à des thèmes concrets. [less ▲]

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See detailRapport intermédiaire de la première phase de la recherche PSE/VE. Santé, absentéisme et travail.
Askenazy, Philippe; Cartron, Damien; Prunier-Poulmaire, Sophie et al

Report (2011)

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See detailPolicy Report on migration and asylum 2010 - Luxembourg
Baltes-Löhr, Christel UL; Koch, Anne UL; Besch, Sylvain

Report (2011)

The Policy report on migration and asylum is destined for the European Migration Network (EMN) and gives an idea of the main political debates and developments in this area in Luxembourg during the year ... [more ▼]

The Policy report on migration and asylum is destined for the European Migration Network (EMN) and gives an idea of the main political debates and developments in this area in Luxembourg during the year 2010. The year 2010 was highlighted in particular by the financial and economic crisis, which was set off during the first quarter of 2008, and the reform proposals presented by the government in order to meet this crisis. Given this context, it must be understood that in terms of general political preoccupation in Luxembourg, the subject areas of migration, asylum and integration took on a more or less secondary role compared to other subject areas. Notwithstanding, the field of migration was subject to important political debates in 2010, related either to legislative changes or to concrete themes. [less ▲]

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See detailLa politique des visas comme canal migratoire
Sommarribas, Adolfo UL; Besch, Sylvain; Baltes-Löhr, Christel UL et al

Report (2011)

La délivrance d'un visa relève de la souveraineté nationale. La politique en matière de visas englobe un certain nombre de paramètres qui sont déterminés par la législation nationale (Constitution, lois ... [more ▼]

La délivrance d'un visa relève de la souveraineté nationale. La politique en matière de visas englobe un certain nombre de paramètres qui sont déterminés par la législation nationale (Constitution, lois, règlements et arrêts), et qui habilitent l'administration à déterminer quels sont les étrangers qui sont autorisés à pénétrer sur son territoire et à y résider de façon provisoire. Il s'agit d'un phénomène social, car ce processus réagit et interagit avec l'ensemble du système social de l'État. Les sous-systèmes sociaux, économiques, politiques, éducatifs et éthiques interviennent dans ce processus. Par exemple, durant des périodes de guerre ou de conflits sociaux, la politique des visas a servi d'instrument efficace pour stopper l'immigration d'un certain type de population. D'autre part, dans les cas de croissance économique élevée, et ce, pour éviter les pénuries de main d'œuvre et soutenir cette croissance , la politique des visas peut autoriser l'immigration des étrangers sur une base plus flexible que celle qui est imposée en cas d'économie en récession . Ce groupe de paramètres, basés sur des termes objectifs et parfois subjectifs, permet de réguler l'entrée de ressortissants étrangers sur le territoire de l'État. Cette régulation se manifeste de deux façons : sous la forme d'une permission qui est accordée par l'État à une personne en particulier, et en même temps sous la forme d'une restriction via un filtrage des personnes qui sont considérées comme une menace potentielle pour l'intérêt public. [less ▲]

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See detailBevölkerungsstrukturen, Umweltverhalten und Regionalökonomische Aktivitäten
Nienaber, Birte UL; Lübke, Stephanie

Report (2011)

Biosphärenreservate bieten die Chance und haben den Auftrag, neue Perspektiven für eine regionale Entwicklung zu erproben. Dabei stehen der wirtschaftende Mensch und seine Umwelt im Mittelpunkt. Die ... [more ▼]

Biosphärenreservate bieten die Chance und haben den Auftrag, neue Perspektiven für eine regionale Entwicklung zu erproben. Dabei stehen der wirtschaftende Mensch und seine Umwelt im Mittelpunkt. Die sozialwissenschaftliche Untersuchung der Universität des Saarlandes und der TU Kaiserslautern zum Biosphärenreservat Bliesgau sollen Informationen zur Bevölkerungsstruktur, zu Lebensstilen, Umweltwahrnehmung und Umweltverhalten sowie zum ökonomischen Handeln ermitteln. [less ▲]

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See detailIst Wirtschaftswachstum systemimmanent?
Irmen, Andreas UL

Report (2011)

No abstract is available for this item.

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See detailThe Type System of VCL Structural and Assertion Diagrams
Amalio, Nuno UL

Report (2011)

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See detailFrom state- to delta-based bidirectional model transformations: the symmetric case
Diskin, Zinovy; Xiong, Yingfei; Czarnecki, Krzysztof et al

Report (2011)

Success and efficiency of software and system design fundamentally relies on its models. The more they are based on formal methods the more they can be automatically transformed to execution models and ... [more ▼]

Success and efficiency of software and system design fundamentally relies on its models. The more they are based on formal methods the more they can be automatically transformed to execution models and finally to implementation code. This paper presents model transformation and model integration as specific problem within bidirectional model transformation, which has shown to support various purposes, such as analysis, optimization, and code generation. The main purpose of model integration is to establish correspondence between various models, especially between source and target models. From the analysis point of view, model integration supports correctness checks of syntactical dependencies between different views and models. The overall concept is based on the algebraic approach to triple graph grammars, which are widely used for model transformation. The main result shows the close relationship between model transformation and model integration. For each model transformation sequence there is a unique model integration sequence and vice versa. This is demonstrated by a quasi-standard example for model transformation between class models and relational data base models. [less ▲]

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See detailCorrectness of Model Synchronization Based on Triple Graph Grammars - Extended Version
Hermann, Frank UL; Ehrig, Hartmut; Orejas, Fernando et al

Report (2011)

Success and efficiency of software and system design fundamentally relies on its models. The more they are based on formal methods the more they can be automatically transformed to execution models and ... [more ▼]

Success and efficiency of software and system design fundamentally relies on its models. The more they are based on formal methods the more they can be automatically transformed to execution models and finally to implementation code. This paper presents model transformation and model integration as specific problem within bidirectional model transformation, which has shown to support various purposes, such as analysis, optimization, and code generation. The main purpose of model integration is to establish correspondence between various models, especially between source and target models. From the analysis point of view, model integration supports correctness checks of syntactical dependencies between different views and models. The overall concept is based on the algebraic approach to triple graph grammars, which are widely used for model transformation. The main result shows the close relationship between model transformation and model integration. For each model transformation sequence there is a unique model integration sequence and vice versa. This is demonstrated by a quasi-standard example for model transformation between class models and relational data base models. [less ▲]

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See detailMigration circulaire et temporaire Données empiriques, pratiques politiques actuelles et futures options au LUXEMBOURG
Besch, Sylvain; Koch, Anne UL; Thormann, Anne et al

Report (2011)

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See detailProperty Rights, Optimal Public Enforcement, and Growth
Irmen, Andreas UL; Kuehnel, Johanna

Report (2011)

We study the link between public enforcement of property rights, innovation investments, and economic growth in an endogenous growth framework with an expanding set of product varieties. We find that a ... [more ▼]

We study the link between public enforcement of property rights, innovation investments, and economic growth in an endogenous growth framework with an expanding set of product varieties. We find that a government may assure positive equilibrium growth through public employment in the enforcement of property rights, if the economic environment is sufficiently favorable to growth and/or public enforcement is sufficiently effective. However, in terms of welfare an equilibrium path without property rights protection and growth might be preferable. In this case the enforcement of property rights involves too much reallocation of labor from production and research towards the public sector. [less ▲]

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See detailIst Wirtschaftswachstum systemimmanent?
Irmen, Andreas UL

Report (2011)

No abstract is available for this item.

Detailed reference viewed: 85 (4 UL)
See detailExternal Sovereign Debt in a Monetary Union: Bailouts and the Role of Corruption
Achury, Carolina; Koulovatianos, Christos UL; Tsoukalas, John

Report (2011)

We build a tractable stylized model of external sovereign debt and endogenous international interest rates. In corrupt economies with rent-seeking groups stealing public resources, a politico-economic ... [more ▼]

We build a tractable stylized model of external sovereign debt and endogenous international interest rates. In corrupt economies with rent-seeking groups stealing public resources, a politico-economic equilibrium is characterized by permanent fiscal impatience which leads to excessive issuing of sovereign bonds. External creditors envision the corrupt economy’s fiscal impatience and buy its bonds at higher interest rates. In turn, this interest-rate increase exacerbates the problem of oversupplying debt, leading the economy to a perfect-foresight trap. In incorrupt countries which have entered a high-interest-rate/high debt-GDP-ratio trap because an immediately recent disaster has caused a sudden jump to a high outstanding debt-GDP ratio, we show that bailout plans with controlled interest rates can help in reducing debt-GDP ratios after some time. On the contrary, under corruption, we show that bailouts are ineffective unless rent-seeking groups are eradicated. [less ▲]

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See detailConcurrent Model Synchronization with Conflict Resolution Based on Triple Graph Grammars-Extended Version
Hermann, Frank UL; Ehrig, Hartmut; Ermel, Claudia et al

Report (2011)

Triple graph grammars (TGGs) have been used successfully to analyse correctness of bidirectional model transformations. Most recently, also a corresponding formal approach to model synchronization has ... [more ▼]

Triple graph grammars (TGGs) have been used successfully to analyse correctness of bidirectional model transformations. Most recently, also a corresponding formal approach to model synchronization has been presented, where a forward propagation operation updates a source model modification from source to target, and symmetrically, a backward propagation operation takes care of updates from target to source models. However, a corresponding formal approach of concurrent model synchronization, where a source and a target modification have to be synchronized simultaneously, has not yet been presented and analysed. This paper closes this gap taking into account that the given and propagated source or target model modifications are in conflict with each other. Our conflict resolution strategy is semi-automatic, where a formal resolution strategy – known from previous work – can be combined with a user-specific strategy. As first main result, we show correctness of concurrent model synchronization with respect to the TGG. This means that each result of our nondeterministic concurrent update leads to a consistent correspondence between source and target models, where consistency is defined by the TGG. As second main result, we show compatibility of concurrent with basic model synchronization. In other words, concurrent model synchronization can be realized either to coincide with forward or with backward propagation. The main results are illustrated by a running example on updating organizational models. [less ▲]

Detailed reference viewed: 63 (4 UL)
See detailAsset Pricing under Rational Learning about Rare Disasters
Koulovatianos, Christos UL; Wieland, Volker

Report (2011)

This paper proposes a new approach for modeling investor fear after rare disasters. The key element is to take into account that investors' information about fundamentals driving rare downward jumps in ... [more ▼]

This paper proposes a new approach for modeling investor fear after rare disasters. The key element is to take into account that investors' information about fundamentals driving rare downward jumps in the dividend process is not perfect. Bayesian learning implies that beliefs about the likelihood of rare disasters drop to a much more pessimistic level once a disaster has occurred. Such a shift in beliefs can trigger massive declines in price-dividend ratios. Pessimistic beliefs persist for some time. Thus, belief dynamics are a source of apparent excess volatility relative to a rational expectations benchmark. Due to the low frequency of disasters, even an infinitely-lived investor will remain uncertain about the exact probability. Our analysis is conducted in continuous time and offers closed-form solutions for asset prices. We distinguish between rational and adaptive Bayesian learning. Rational learners account for the possibility of future changes in beliefs in determining their demand for risky assets, while adaptive learners take beliefs as given. Thus, risky assets tend to be lower-valued and price-dividend ratios vary less under adaptive versus rational learning for identical priors. [less ▲]

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See detailLes mesures pratiques mises en oeuvre afin de réduire la migration irrégulière
Koch, Anne UL; Monteiro, Joaquim UL; Besch, Sylvain et al

Report (2011)

Dans cette étude, le EMN NCP LU essaie de donner, dans la mesure du possible, les différentes perspectives et initiatives par rapport à la migration irrégulière au niveau national, en particulier les ... [more ▼]

Dans cette étude, le EMN NCP LU essaie de donner, dans la mesure du possible, les différentes perspectives et initiatives par rapport à la migration irrégulière au niveau national, en particulier les mesures pratiques mises en place pour essayer de la contenir. Du point de vue du cadre politique, la lutte contre la migration irrégulière est progressivement devenue une priorité au fil de la dernière décennie comme le démontrent les différents programmes gouvernementaux analysés dans l’étude. En effet, les autorités nationales situent la lutte contre la migration irrégulière dans une politique dite cohérente des flux migratoires. Le frein à la migration irrégulière va de pair avec une stimulation des migrations régulières en accord avec les besoins en main-d’œuvre des secteurs d’activités économiques. En ce sens, la politique nationale suit les grandes lignes d’orientation de la politique européenne en la matière. Cette dernière affirmation se reflète également par la transposition des principales directives relatives à la migration, en particulier la directive dite « retour » et la directive dite « sanctions » . D’un autre côté, la législation nationale reste toutefois également le reflet des volontés politiques nationales. Au-delà des transpositions du droit communautaire, nous pouvons constater que le cadre législatif peut être adapté pour faire face à une situation particulière. Ainsi, face aux pressions exercées par les associations qui militent pour les droits des étrangers, les autorités nationales prévoient des voies pour sortir de l’irrégularité ; certes considérées largement inefficaces par les associations mais cependant consacrées dans la loi. [less ▲]

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See detailLa force de l’emploi intérieur et la politique migratoire - Luxembourg
Sommarribas, Adolfo UL; Besch, Sylvain; Baltes-Löhr, Christel UL

Report (2011)

L’immigration économique est considérée par les États membres de l’Union Européenne comme un facteur important pour résoudre non seulement le problème de vieillissement de la population général de l’Union ... [more ▼]

L’immigration économique est considérée par les États membres de l’Union Européenne comme un facteur important pour résoudre non seulement le problème de vieillissement de la population général de l’Union, les taux de natalité négative et la manque de main-d’oeuvre hautement qualifié. Après la crise économique et financière des dernières trois années la problématique ne perds pas d’actualité, même si la crise a eu un impact direct sur les marchés du travail des états membres et sur la demande de main-d’oeuvre. Comme principe général, la matière d’immigration est une compétence primaire de chaque état membre qui a le droit à règlementer non seulement les volumes sinon aussi les formes et conditions des étrangers sur le marché du travail national. Tout cela en répondant à sa propre politique et intérêts économiques. Néanmoins, l’Union Européen à travers de ses diverses institutions et politiques à légiférer de manière approfondie sur le sujet avec l’objectif de maintenir la compétitivité et la croissance économique. [less ▲]

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See detailCircular and Temporary Migration, Empirical Evidence, Current Policy Practice and Future Options in LUXEMBOURG
Koch, Anne UL; Thormann, Anne; Besch, Sylvain et al

Report (2011)

Circular and temporary migrations have become important concepts at the global and EU-level and have elicited remarkable interest among policy-makers and scholars, notably in relation to the wider issue ... [more ▼]

Circular and temporary migrations have become important concepts at the global and EU-level and have elicited remarkable interest among policy-makers and scholars, notably in relation to the wider issue of migration and development. The preparation of the national contribution to the EMN study on circular and temporary migration has shown that, in Luxembourg, both political and civil society actors are unfamiliar with the concept of circular migration, which is virtually absent in political or societal debates. To a lesser degree, this also applies to temporary migration. There are no empirical studies on the subject-matter in Luxembourg. The present report therefore constitutes the first publication that addresses the topic in the national context, systematically brings together relevant sources and analyses national policy, legislation and available data. Given the lack of a national definition of both circular and temporary migration based on national legislation, the first part of the report has focused on the elaboration of working definitions of these terms. The national policy approach and vision on circular and temporary migration have been analysed in the main part of the report. In order to identify the approach to circular and temporary migration and policy preferences in the context of Luxembourg, an analysis of national legislation (including the legal provisions for relevant categories of immigrants, long-term residence status, plural nationality and the portability of social benefits) and public documents was conducted. The co [less ▲]

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See detailPractical Measures for Reducing Irregular Migration
Koch, Anne UL; Monteiro, Joaquim UL; Besch, Sylvain et al

Report (2011)

In this study, the EMN NCP LU attempts to provide, as far as possible, an overview of existing approaches, mechanisms and measures implemented in Luxembourg in order to address irregular migration. The ... [more ▼]

In this study, the EMN NCP LU attempts to provide, as far as possible, an overview of existing approaches, mechanisms and measures implemented in Luxembourg in order to address irregular migration. The analysis of different governmental programmes has shown that the fight against irregular migration has gradually become a priority on policy level over the last decade. As a matter of fact, for national authorities the fight against irregular migration is one part of a general immigration policy. Addressing irregular migration thus goes hand-in-hand with the promotion of legal migration in accordance with labour force requirements of the economic activity sectors. In this sense, national policy largely follows the guiding lines of European policy on the subject. This latest assertion is equally reflected by the transposition of two main EU directives relating to irregular migration into national law, in particular the “return” directive and the "sanctions" directive. On the other hand, the national legislation remains nevertheless the reflection of national political wills. Beyond the transpositions of Community law, it can be observed that the national legislative framework can and has been adapted as a response to a particular situation. Faced with pressures exerted by several associations which argue for the rights of foreigners, national authorities have stipulated pathways out of irregularity. Even if these provisions are considered widely ineffective by the associations, they are nonetheless enshrined in national law. [less ▲]

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See detailVersorgungsatlas Rheinland-Pfalz: Versorgungssurvey - Berufsmonitoring - Hochrechnungen
Siegert, Michael; Leidinger, Erwin; Pitzius, Oliver et al

Report (2010)

Die wohl bedeutendste sozio-ökonomische Entwicklung, die auf unsere Gesellschaft zukommt, ist der demografische Wandel: Die Bevölkerung wird insgesamt älter und die Bevölkerungszahl wird abnehmen. Dabei ... [more ▼]

Die wohl bedeutendste sozio-ökonomische Entwicklung, die auf unsere Gesellschaft zukommt, ist der demografische Wandel: Die Bevölkerung wird insgesamt älter und die Bevölkerungszahl wird abnehmen. Dabei wird diese Entwicklung in ländlichen Gebieten früher beginnen als in städtischen Gebieten. Bis zum Jahr 2020 wird sich der Altersaufbau der Bevölkerung Deutschland verglichen mit dem heutigen Aufbau wenig ändern – danach aber umso stärker. Vor diesem Hintergrund dient der Versorgungsatlas zum einen als Bestandsaufnahme von Angebot und Nachfrage der ambulanten Versorgung in Rheinland-Pfalz. Zum anderen wird hochgerechnet, wie sich Angebot und Nachfrage in Zukunft entwickeln könnten. Dazu werden verschiedene Datenquellen zusammengeführt. Es handelt sich dabei um Befragungsdaten aus einem erstmals in Rheinland-Pfalz durchgeführten Versorgungssurvey in der allgemeinen Bevölkerung und einem Berufsmonitoring bei Medizinstudenten der Universität Mainz sowie Sekundärdaten der KV RLP. Diese Berechnungen sind Basis für die Beantwortung der Frage, ob die ambulante Versorgung in Rheinland-Pfalz auch in Zukunft qualitativ und quantitativ ausreichend gesichert ist. Der Versorgungsatlas ist das Resultat einer intensiven Zusammenarbeit von Wissenschaft und Praxis. Die KV RLP, zuständig für die Sicherstellung der ambulanten Versorgung hat die Stabsstelle Versorgungsforschung eingerichtet, um bislang brachliegende Daten und ungenutzte Ressourcen für die Versorgungsforschung zu nutzen. Der Atlas soll exemplarisch zeigen, welche Möglichkeiten der Darstellung und Analyse diese Daten und das von der Versorgungsforschung entwickelte Datenbank- und Analysesystem bietet. Dabei hat die vorliegende Printversion nur exemplarischen Charakter. Der Innovationsgehalt liegt in der Online-Nutzung der Daten. Hier verfolgt die KV RLP zwei Strategien. Zum einen werden Karten auf der Internetseite der KV RLP unter www.kv-rlp.de in kontinuierlich aktualisierter Form für die Öffentlichkeit bereitgestellt, zum anderen sind aktuelle und sehr differenzierte Analysen – zum Beispiel für die kleinräumige Niederlassungsberatung – auf Anfrage möglich. [less ▲]

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See detailEnterprise Modelling using Algebraic Graph Transformation - Extended Version
Brandt, Christoph; Hermann, Frank UL; Ehrig, Hartmut et al

Report (2010)

An analysis of today's situation at Credit Suisse has shown severe problems, because it is based on current best practices and ad-hoc modelling techniques to handle important aspects of security, risk and ... [more ▼]

An analysis of today's situation at Credit Suisse has shown severe problems, because it is based on current best practices and ad-hoc modelling techniques to handle important aspects of security, risk and compliance. Based on this analysis we propose in this paper a new enterprise model which allows the construction, integration, transformation and evaluation of di erent organizational models in a big decentralized organization like Credit Suisse. The main idea of the new model framework is to provide small decentralized models and intra-model evaluation techniques to handle services, processes and rules separately for the business and IT universe on one hand and for human-centric and machine-centric concepts on the other hand. Furthermore, the new framework provides inter-modelling techniques based on algebraic graph transformation to establish the connection between di erent kinds of models and to allow integration of the decentralized models. In order to check for security, risk and compliance in a suitable way, our models and techniques are based on di erent kinds of formal methods. In this paper, we show that algebraic graph transformation techniques are useful not only for intra-modelling { using graph grammars for visual languages and graph constraints for requirements { but also for inter-modelling { using triple graph grammars for model transformation and integration. Altogether, we present the overall idea of our new model framework and show how to solve speci c problems concerning intra- and inter-modelling as rst steps. This should give evidence that our framework can also ? This work is partially supported by Credit Suisse (Luxembourg) S.A., 56, Grand Rue BP 40, L-1660 Luxembourg, Telephone: +352 46 00 11-1, Fax: +352 46 32 70 handle important other requirements for enterprise modelling in a big decentralized organization like Credit Suisse. [less ▲]

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See detailConfronting the Representative Consumer with Household-Size Heterogeneity
Koulovatianos, Christos UL; Schroeder, Carsten; Schmidt, Ulrich

Report (2010)

Much analysis in macroeconomics empirically addresses economy-wide incentives behind consumer/investment choices by using insights from the way a single representative household would behave ... [more ▼]

Much analysis in macroeconomics empirically addresses economy-wide incentives behind consumer/investment choices by using insights from the way a single representative household would behave. Heterogeneity at the micro level can jeopardize attempts to back up the representative consumer construct with microfoundations. One complex aspect of micro-level heterogeneity is household size, as individuals living in multi-member households have the potential to share goods within the household, benefiting from household-size economies. Theoretically, we show that validating the role of a representative consumer would require that the way individuals benefit from intra-household sharing is strictly aligned across the rich and the poor: once expenditures for subsistence needs are subtracted from disposable household income, household-size economies the remainder (discretionary) household incomes entail must be the same across the rich and the poor. We have designed a survey method that allows the testing of this stringent property of intra-household sharing and find that it holds. [less ▲]

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See detailSteady-State Growth and the Elasticity of Substitution
Irmen, Andreas UL

Report (2010)

In a neoclassical economy with endogenous capital- and labor-augmenting technical change the steady-state growth rate of output per worker is shown to increase in the elasticity of substitution between ... [more ▼]

In a neoclassical economy with endogenous capital- and labor-augmenting technical change the steady-state growth rate of output per worker is shown to increase in the elasticity of substitution between capital and labor. This confirms the assessment of Klump and de La Grandville (2000) that the elasticity of substitution is a powerful engine of economic growth. However, unlike their findings my result applies to the steady-state growth rate. Moreover, it does not hinge on particular assumptions on how aggregate savings come about. It holds for any household sector allowing savings to grow at the same rate as aggregate output. [less ▲]

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See detailAnalyse des élections au Luxembourg de Juin 2009
Dumont, Patrick UL; Kies, Raphaël UL; Spreitzer, Astrid et al

Report (2010)

Le chapitre 1 Législations, partis et campagne électorale au Luxembourg retrace d’une part les transformations du système politique luxembourgeois (avec la modification de la loi électorale, la ... [more ▼]

Le chapitre 1 Législations, partis et campagne électorale au Luxembourg retrace d’une part les transformations du système politique luxembourgeois (avec la modification de la loi électorale, la promulgation de loi sur le financement des partis politiques et les évènements qui ont marqué la législature 2004-2009) et, d’autre part analyse les enjeux et challenges de la législature 2004-2009. Il se focalise sur la campagne électorale de septembre 2008 à juin 2009 (aussi bien à travers les sondages que par un dépouillement exhaustif de la presse quotidienne et hebdomadaire luxembourgeoise de langue allemande et française à caractère politique). Le chapitre 2 Formation de l’opinion et candidats aux législatives et européennes a pour objet les conditions de la formation de l’opinion, de la représentation et de la médiation en politique au Grand-Duché. Ce chapitre informe particulièrement sur comment les citoyens forment leurs intentions de vote, les stratégies des partis tant dans le choix des candidatures que dans la mise en forme de leurs identités politiques et leurs relations avec les autres acteurs du système politique, communément appelés la « société civile ». Le chapitre 3 Résultats des élections législatives et européennes introduit non seulement de nouveaux modes de calculs pour la présentation des résultats, mais établit aussi des corrélations entre des caractéristiques socio-démographiques, tirées des données du recensement de 2001, des données statistiques sur la population en 2008 et en 2009 du STATEC et de l’IGSS de 2009 et des résultats des partis au niveau des 116 communes du Luxembourg. Les chapitre 4 et 5 Électorats dans les sondages pré & post-électoral visent, quant à eux, à établir le portrait sociologique des électorats des partis et leurs valeurs à travers tant les classiques déterminants du vote, comme la structure par âge, par genre, par niveau d’instruction et par situation face à l’emploi que par l’échelle des valeurs « matérialistes »/ »post-matérialistes » conceptualisée par Ronald Inglehart et ses disciples. En plus de l’étude des Luxembourgeois, pour la première fois, nous analysons aussi les étrangers résidents au Luxembourg. Le chapitre 6 Étude des bulletins marque la continuité avec les études précédentes sur les élections législatives et européennes, puisque c’est la huitième fois qu’il est procédé à un échantillonnage des bulletins réels pour les élections législatives. Cette analyse permet, d’une part, d’évaluer les proximités entre les partis eux-mêmes et, d’autre part, de mesurer les performances des politiques électorales personnelles des candidats, indépendamment de leurs affiliations personnelles. Nouveauté en 2009, il a été étudié également les bulletins pour les élections européennes. [less ▲]

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See detailA constraint system for a SML type error slicer
Rahli, Vincent UL; Wells, J. B.; Kamareddine, Fairouz

Report (2010)

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See detailELER - Plan zur Entwicklung des ländlichen Raums im Saarland 2007-2013, Halbzeitbewertung 2007-2009
Doluschitz, Rainer; Grosskopf, Werner; Nienaber, Birte UL

Report (2010)

This is the mid-term evaluation of the EAFRD programme (2007-2013) in Saarland, Germany.

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See detailModeling and Reconfiguration of critical Business Processes for the purpose of a Business Continuity Management respecting Security Risk and Compliance requirements at Credit Suisse using Algebraic Graph Transformation: Extended Version
Brandt, Christoph; Hermann, Frank UL; Groote, Jan-Friso

Report (2010)

Critical business processes can fail. A Business Continuity Management System is a special management system that will de ne how to recover from such failures and speci es temporary work-arounds to make ... [more ▼]

Critical business processes can fail. A Business Continuity Management System is a special management system that will de ne how to recover from such failures and speci es temporary work-arounds to make sure a company is not going out of business in the worst case. However, because today's implementations are primarily organizational best-practice solutions, their security, risk and compliance issues in such a recovery situation are mostly unknown. Algebraic graph theory can be used as a formal method supporting employees when running business processes need to be recon gured to recover from speci c failures. The example discussed is a loan granting process in a real-world banking environment. Because such a process has to respect certain laws, regulations and rules even in emergency situations, we sketch how this can be done during the process recon guration by looking at security, risk and compliance issues, compatible with the graph technique. Furthermore, we show how the analysis can be extended to requirements concerning the information ow using the process algebra mCRL2. [less ▲]

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See detailEfficient Process Analysis of Transformation Systems Based on Petri nets
Hermann, Frank UL; Corradini, Andrea; Ehrig, Hartmut et al

Report (2010)

In the framework of adhesive transformation systems with Negative Application Conditions (NACs), we show how the problem of computing the set of equivalent derivations to a given one can be reduced to the ... [more ▼]

In the framework of adhesive transformation systems with Negative Application Conditions (NACs), we show how the problem of computing the set of equivalent derivations to a given one can be reduced to the analysis of the reachability graph of a generated Place/Transition Petri net. This net encodes the dependencies among rule applications of the derivation, including the inhibiting e ects of the NACs. We show the e ectiveness of this approach by comparing the cost of a brute force-approach with the cost of the presented analysis applied to a derivation of a simple system, showing a signi cant improvement in speed. [less ▲]

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See detailEfficient Analysis and Execution of Correct and Complete Model Transformations Based on Triple Graph Grammars - Extended Version
Hermann, Frank UL; Ehrig, Hartmut; Golas, Ulrike et al

Report (2010)

Triple Graph Grammars are a well-established, formal and intuitive concept for the specification and analysis of bidirectional model transformations. In previous work we have formalized and analyzed ... [more ▼]

Triple Graph Grammars are a well-established, formal and intuitive concept for the specification and analysis of bidirectional model transformations. In previous work we have formalized and analyzed already termination, correctness, completeness, local confluence and functional behaviour. In this paper, we show how to improve the efficiency of the execution and analysis of model transformations in practical applications by using triple rules with negative application conditions (NACs). In addition to specification NACs, which improve the specification of model transformations, the generation of filter NACs improves the efficiency of the execution and the analysis of functional behaviour supported by critical pair analysis of the tool AGG. We illustrate the results for the well-known model transformation from class diagrams to relation database models. [less ▲]

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See detailFormal Analysis of Functional Behaviour for Model Transformations Based on Triple Graph Grammars - Extended Version
Hermann, Frank UL; Ehrig, Hartmut; Orejas, Fernando et al

Report (2010)

Triple Graph Grammars (TGGs) are a well-established concept for the specification of model transformations. In previous work we have formalized and analyzed already crucial properties of model ... [more ▼]

Triple Graph Grammars (TGGs) are a well-established concept for the specification of model transformations. In previous work we have formalized and analyzed already crucial properties of model transformations like termination, correctness and completeness, but functional behaviour - especially local confluence - is missing up to now. In order to close this gap we generate forward translation rules, which extend standard forward rules by translation attributes keeping track of the elements which have been translated already. In the first main result we show the equivalence of model transformations based on forward resp. forward translation rules. This way, an additional control structure for the forward transformation is not needed. This allows to apply critical pair analysis and corresponding tool support by the tool AGG. However, we do not need general local confluence because confluence for source graphs not belonging to the source language is not relevant for the functional behaviour of a model transformation. For this reason we only have to analyze a weaker property, called translation confluence. This leads to our second main result, the functional behaviour of model transformations, which is applied to our running example, the model transformation from class diagrams to database models. [less ▲]

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See detailLow- and High-Level Petri Nets with Individual Tokens
Modica, Tony; Gabriel, Karsten; Ehrig, Hartmut et al

Report (2010)

In this article, we present a new variant of Petri nets with markings called Petri nets with individual tokens, together with rule-based transformation following the double pushout approach. The most ... [more ▼]

In this article, we present a new variant of Petri nets with markings called Petri nets with individual tokens, together with rule-based transformation following the double pushout approach. The most important change to former Petri net transformation approaches is that the marking of a net is no longer a collective set of tokens, but each each has an own identity leading to the concept of Petri nets with individual tokens. This allows us to formulate rules that can change the marking of a net arbitrarily without necessarily manipulating the structure. As a first main result that depends on nets with individual markings we show the equivalence of transition firing steps and the application of firing-simulating rules. We define categories of low-level and of algebraic high-level nets with individual tokens, called PTI nets and AHLI nets, respectively and relate them with each other and their collective counterparts by functors. To be able to use the properties and analysis results of \MCALM-adhesive HLR systems (formerly know as weak adhesive high-level replacement systems) we show in further main results that both categories of PTI nets and AHLI nets are \MCALM-adhesive categories. By showing how to construct initial pushouts we also give necessary and sufficient conditions for the applicability of transformation rules in these categories, known as gluing condition in the literature. [less ▲]

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See detailWunnéngshëllef: Eine Institution im Wandel. Anlayse der Erfahrungen, Interessen und Motive der Mitarbeiter als Grundlage der Konzept- und Strategieentwicklung
Biewers, Sandra UL; Joachim, Patrice UL

Report (2009)

Der vorliegende Evaluationsbericht dokumentiert die Ergebnisse einer Studie, die im Sommer 2005 durch die Wunnéngshëllef beim luxemburgischen Forschungsinstitut CESIJE (Centre d'Etudes sur la Situation ... [more ▼]

Der vorliegende Evaluationsbericht dokumentiert die Ergebnisse einer Studie, die im Sommer 2005 durch die Wunnéngshëllef beim luxemburgischen Forschungsinstitut CESIJE (Centre d'Etudes sur la Situation des Jeunes en Europe) in Auftrag gegeben wurde. Sie hat das Ziel, die strukturellen und konzeptionellen Leistungen der Institution Wunnéngshëllef mit sozialwissenschaftlichen Instrumenten zu beleuchten und zu analysieren, um hieraus Einschätzungen zur Ist-Situation der institutionellen und organisatorischen Abläufe, ihrer Qualität, aber auch des Entwicklungsbedarfs und des Entwicklungspotentzials zu erhalten. [less ▲]

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See detailKeep It Small, Keep It Real: Efficient Run-time Verification of Web Service Compositions
Baresi, Luciano; Bianculli, Domenico UL; Guinea, Sam et al

Report (2009)

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See detailAutomated Performance Assessment for Service-Oriented Middleware
Bianculli, Domenico UL; Binder, Walter; Drago, Mauro Luigi

Report (2009)

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See detailReconciliation between work, private and family life in the European Union
Margherita, Antonia UL; O'Dorchai, Sile; Bosch, Jelle et al

Report (2009)

Work is a source of income, professional satisfaction and social contact. However, work is not always easy to combine with family life and other private activities, especially for parents. Reconciling ... [more ▼]

Work is a source of income, professional satisfaction and social contact. However, work is not always easy to combine with family life and other private activities, especially for parents. Reconciling both demands is an important issue for many citizens in the European Union. This publication looks at various aspects of the issue of reconciliation of work with family life. It features discussions of the data sources used and gives an overview of the differences in the relevant legal arrangements in the Member States. The report starts with a description of the labour market situation, including developments in part-time work, fixed-term contracts and household composition. The following chapters cover working hours with special attention to unpaid family work, childcare and other care services, maternity and parental leave and flexibility in working time arrangements, including atypical working times such as working at night or at the weekend. [less ▲]

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See detailShe Figures 2009 – Statistics and Indicators on Gender Equality in Science
O'Dorchai, Sile; Meulders, Danièle; Crippa, Francesca et al

Report (2009)

She Figures 2009 is the third publication (following She Figures 2003 and She Figures 2006) of a key set of indicators that are essential to correctly comprehend the situation of women in science and ... [more ▼]

She Figures 2009 is the third publication (following She Figures 2003 and She Figures 2006) of a key set of indicators that are essential to correctly comprehend the situation of women in science and research. [less ▲]

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See detailPermutation Equivalence of DPO Derivations with Negative Application Conditions based on Subobject Transformation Systems: Long Version
Hermann, Frank UL

Report (2009)

Switch equivalence for transformation systems has been successfully used in many domains for the analysis of concurrent behaviour. When using graph transformation as modelling framework for these systems ... [more ▼]

Switch equivalence for transformation systems has been successfully used in many domains for the analysis of concurrent behaviour. When using graph transformation as modelling framework for these systems the concept of negative application conditions (NACs) is widely used -- in particular for the specification of operational semantics. In this paper we show that switch equivalence can be improved essentially for the analysis of systems with NACs by our new concept of permutation equivalence. Two derivations respecting all NACs are called permutation-equivalent if they are switch-equivalent disregarding the NACs. In fact, there are permutation-equivalent derivations which are not switch-equivalent with NACs. As main result of the paper, we solve the following problem: Given a derivation with NACs, we can efficiently derive all permutation-equivalent derivations to the given one by static analysis. The results are based on extended techniques for subobject transformation systems which have been introduced recently. [less ▲]

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See detailCompleteness and Correctness of Model Transformations based on Triple Graph Grammars with Negative Application Conditions (Long Version)
Ehrig, Hartmut; Hermann, Frank UL; Sartorius, Christoph

Report (2009)

Model transformations are a key concept for modular and distributed model driven development. In this context, triple graph grammars have been investigated and applied to several case studies and they ... [more ▼]

Model transformations are a key concept for modular and distributed model driven development. In this context, triple graph grammars have been investigated and applied to several case studies and they show a convenient combination of formal and intuitive specification abilities. Especially the automatic derivation of forward and backward transformations out of just one specified set of rules for the integrated model simplifies the specification and enhances usability as well as consistency. Since negative application conditions (NACs) are key ingredient for many model transformations based on graph transformation we embed them in the concept of triple graph grammars. As a first main result we can extend the composition/decomposition result for triple graph grammars to the case with NACs. This allows us to show completeness and correctness of model transformations based on rules with NACs and furthermore, we can extend the characterization of information preserving model transformations to the case with NACs. The presented results are applicable to several model transformations and in particular to the well known model transformation from class diagrams to relational data bases, which we present as running example with NACs. [less ▲]

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See detailOn-the-Fly Construction, Correctness and Completeness of Model Transformations based on Triple Graph Grammars: Long Version
Ehrig, Hartmut; Ermel, Claudia; Hermann, Frank UL et al

Report (2009)

Triple graph grammars (TGGs) are a formal and intuitive concept for the specification of model transformations. Their main advantage is an automatic derivation of operational rules for bidirectional model ... [more ▼]

Triple graph grammars (TGGs) are a formal and intuitive concept for the specification of model transformations. Their main advantage is an automatic derivation of operational rules for bidirectional model transformations, which simplifies specification and enhances usability as well as consistency. In this paper we continue previous work on the formal definition of model transformations based on triple graph rules with negative application conditions (NACs). The new notion of partial source consistency enables us to construct consistent model transformations on-the-fly instead of analyzing consistency of completed model transformations. We show the crucial properties termination, correctness and completeness (including NAC-consistency) for the model transformations resulting from our construction. Moreover we define parallel independence for model transformation steps which allows us to perform partial-order reduction in order to improve efficiency. The results are applicable to several relevant model transformations and in particular to our example transformation from class diagrams to database models. [less ▲]

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See detailKnowledge Structures
Müller, Moritz; COWAN, Robin; Duysters, Geert et al

Report (2009)

This paper investigates how technological distance between firms affects their network of R\&D alliances. Our theoretic model assumes that the benefit of an alliance between two firms is given by their ... [more ▼]

This paper investigates how technological distance between firms affects their network of R\&D alliances. Our theoretic model assumes that the benefit of an alliance between two firms is given by their technological distance. This benefit-distance relationship determines the ego-network of each firm as well as the overall network structure. Empirical relevance is confirmed for the bio-pharmaceutical industry. Although we find that the network structure is largely explained by firm size, technological distance determines the positioning of firms in the network. [less ▲]

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See detailYouth in Europe - A statistical portrait
Desurmont, Arnaud; Margherita, Antonia UL; Alciator, Marco et al

Report (2009)

This publication attempts to draw a portrait of young people living in Europe. ‘Youth in Europe’ is based on data available at EU level, using mainly a broad selection of harmonised data sources available ... [more ▼]

This publication attempts to draw a portrait of young people living in Europe. ‘Youth in Europe’ is based on data available at EU level, using mainly a broad selection of harmonised data sources available at Eurostat. The reader will find statistical information on a wide range of topics relating to youth in Europe, including demographic aspects (ageing of the population, founding a family), health and living conditions, education and starting out in working life, and participation in cultural and social activities. The data presented in ‘Youth in Europe’ show that the situation of young people differs considerably from one country to another, which can be explained by a range of cultural, social and economic factors. This publication aims to encourage further interest and research into the fascinating world of young people in order to better understand the Europe of today and of tomorrow. [less ▲]

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See detailProcess Definition of Adhesive HLR Systems
Hermann, Frank UL

Report (2008)

Process models of graph transformation systems are based on the concept of occurrence grammars, which are a generalization of Petri net processes given by occurrence nets. Recently, subobject ... [more ▼]

Process models of graph transformation systems are based on the concept of occurrence grammars, which are a generalization of Petri net processes given by occurrence nets. Recently, subobject transformation systems were proposed as an abstract framework for occurrence grammars in adhesive categories, but they are restricted to monomorphic matches for transformation steps. In this paper we review the construction of STSs as processes for plain graph grammars and present an extension to weak adhesive HLR categories with non-monomorphic matching, such that e.g. attributed graph grammars are included. [less ▲]

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