OPUS 4 | Wirtschaftswissenschaften

Tagungsband zum Doctoral Consortium der WI 2013 (2013)

Bereits seit Anfang der 1990er Jahre wird jungen Wissenschaftlern im Vorfeld der Tagung "Wirtschaftsinformatik" ein Doctoral Consortium als unterstützendes Forum angeboten. Diese Einrichtung wurde auch zur größten internationalen Konferenz der Wirtschaftsinformatik, der WI 2013 in Leipzig, fortgeführt. Dieser Band fasst die zum Vortrag ausgewählten Beiträge zusammen.

Performance Evaluation - Annual Report Year 2 (2006)

Oscar Ardaiz Michele Catalano Pablo Chacin Isaac Chao Juan Carlos Cruellas Felix Freitag Manuel Medina Leandro Navarro Miguel Valero Liviu Joita Omer F. Rana Björn Schnizler Torsten Eymann

In this paper a performance measuring infrastructure,developed for the prototype and simulator, concering the experiment configuration, data measurement, and data collection, is presented. A corresponding performance evaluation framework is defined to obtain the metrics from the measured data. Initial experiments were carried out to test the developed prototype, simulator and the performance measuring infrastructure.

Proof-of-Concept Application - Annual Report Year 2 (2006)

Oscar Ardaiz Pablo Chacin Isaac Chao Juan Carlos Cruellas Felix Freitag Manuel Medina Leandro Navarro Miguel Valero Loviu Joita Omer F. Rana Torsten Eymann

Proof-of-Concept Application - Annual Report Year 3 (2007)

Oscar Ardaiz Pablo Chacin Isaac Chao Felix Freitag Leandro Navarro Liviu Joita Omer F. Rana Werner Streitberger Sebastian Hudert Torsten Eymann

In this report the progress of developing the proof-of-concept application in the CATNETS project is presented. Hence the development of the necessary performance measuring components as well as a distributed application to execute on economic-enhanced Grid/P2P platforms and middleware integration are described.

Towards the Governance of Open Distributed Grids - A Case Study in Wireless Mobile Grids (2011)

Tina Balke

New networking technologies such as wireless mobile grids and peer-to-peer middleware are examples of a growing class of open distributed systems whose strength is the absence of a central controlling instance and which function through the cooperation of autonomous entities that voluntarily commit resources to a common pool. The social dilemma in such systems is that it is advantageous for rational users to access the common pool resources without making any commitment of their own. This is commonly known as “free-riding”. However, if a substantial number of users followed this selfish strategy, the system itself would fail, depriving all users of its benefits. In this dissertation, we demonstrate how governance decisions can induce cooperation in such systems and how normative frameworks in combination with multi-agent system simulations can be successfully employed to analyse their effects, even at an early development stage. We show that our approach is not only practical and powerful, but also easily accessible. We demonstrate its functionality by implementing a prototype to explore the impact of enforcement mechanisms on wireless mobile grids, a concept which has been proposed to address the energy issues arising in the next generation of mobile phones and the networks that connect them. We also infer lessons from this example for open distributed systems in general. Simulation experiments quantify the benefits of enforcement mechanisms for wireless mobile grids. We analyse these results with respect to the costs of enforcement as well as further criteria that reflect the interests of the multiple stakeholders in the system. We conclude with some observations on how the lessons learned from both process and outcomes may be applicable to the broader context of open distributed systems. In particular, we highlight (i) the use of simulation using intelligent agents and a normative framework as a means for in silico exploration of complex systems for both business and technological objectives, and (ii) the insight offered into a range of enforcement mechanisms and a better understanding of the conditions and constraints under which they are applicable.

A Survey on Reputation Systems for Artificial Societies (2009)

Tina Balke Stefan König Torsten Eymann

The Internet has caused a revolution in trading. Especially cheap items are now easy to buy and sell on the Internet. As a consequence, sellers nowadays offer a wide range of products on the web, creating an abundance of choice for consumers. Consumers have the opportunity to browse on different auction sites for the item they really want. Along with this success story, however, came the stories of people being cheated by fraudulent online sellers. These frauds cover a range from not delivering what has been promised, the overrating of a product´s condition, to deliberate acts of theft. They are a result of so-called asymmetric information. Trust and reputation mechanisms are intended to address this asymmetric information distribution. This article surveys the most common trust and reputation systems.

Proceedings of the 11th European Agent Systems Summer School Student Session (2009)

Tina Balke Serena Villata Daniel Villatoro

This volume contains the papers presented at the Student Session of the 11th European Agent Systems Summer School (EASSS) held on 2nd of September 2009 at Educatorio della Providenza, Turin, Italy. The Student Session, organised by students, is designed to encourage student interaction and feedback from the tutors. By providing the students with a conference-like setup, both in the presentation and in the review process, students have the opportunity to prepare their own submission, go through the selection process and present their work to each other and their interests to their fellow students as well as internationally leading experts in the agent field, both from the theoretical and the practical sector.

Proceedings of the 12th European Agent Systems Summer School Student Session (2010)

Tina Balke Reda Yaich

This volume contains the papers presented at the Student Session of the 12th European Agent Systems Summer School (EASSS) held on 25th of August 2010 at Ecole Nationale Superieure des Mines de Saint-Etienne, France. The Student Session, organised by students, is designed to encourage student interaction and feedback from the tutors. By providing the students with a conference-like setup, both in the presentation and in the review process, students have the opportunity to prepare their own submission, go through the selection process and present their work to each other and their interests to their fellow students as well as internationally leading experts in the agent field,both from the theoretical and the practical sector.

Topics in health economics and social policy - abstracts of the 7th DIBOGS-Workshop, Düsseldorf 2012 (2013)

Carolin Banduhn Oxana Bechtold Toufic M. El Masri Laura Birg Annika Herr Christian Pfarr Andreas Schmid Hendrik Schmitz Ansgar Wübker

Der DIBOGS e.V. ist aus dem Duisburg-Ilmenau-Bayreuther Oberseminar zur Gesund-heitsökonomik und Sozialpolitik (DIBOGS) hervorgegangen. Der Verein hat sich zum Ziel gesetzt, den wissenschaftlichen Nachwuchs auf dem Gebiet der Wirtschaftswissenschaften in den Forschungsfeldern Gesundheitsökonomik, Gesundheitspolitik und Sozialpolitik zu fördern. Zu den Aktivitäten des Vereins zählt u.a. ein gesundheitsökonomischer Workshop, der erstmalig im Jahr 2005 ausgerichtet wurde und der sich zentral an gesundheitsökonomische Nachwuchswissenschaftler richtet. Ziel ist es, einen möglichst regen Erfahrungsaustausch herbeizuführen und insofern Unterstützung bei der Vorbereitung und Durchführung von Dissertations- oder Habilitationsvorhaben, sowie sonstigen wissenschaftlichen Projekten oder Publikationen zu bieten. Der Workshop stellt nicht die Präsentation an sich, sondern den Austausch über das jeweilige Thema in den Mittelpunkt. Alle Papiere gehen den Teilnehmern im Vorfeld zu. Während des Workshops stehen für jedes Papier 45 Minuten zur Verfügung. Ein Koreferent setzt sich in-tensiv mit dem Papier auseinander, darauf schließt sich eine Diskussion unter den Teilnehmern an. Mittlerweile (seit 2006) gibt es zu jedem Workshop einen Sammelband, der die (fach)politische Öffentlichkeit über diskutierte Themen informieren soll. Der vorliegende Band „DIBOGS-Beiträge zur Gesundheitsökonomik und Sozialpolitik“ enthält - im Gegensatz zu den Überblicksartikeln aus den Vorjahren - die Zusammenfassungen/Abstracts ausgewählter Beiträge des siebten Duisburg-Ilmenau-Bayreuther Oberseminars zur Gesundheitsökonomik und Sozialpolitik (DIBOGS), das am 23. November 2012 in Düsseldorf stattgefunden hat. Die Zusammenfassung soll einen ersten Überblick über die diskutierten Papiere geben, die unter den ggf. jeweils angegeben Links auch im Detail gelesen werden können. Weitere Informationen zum Sammelband sowie zur Teilnahme am Workshop entnehmen Sie bitte der Webseite www.dibogs.biz.

Performance Evaluation - Annual Report Year 3 (2007)

Georg Buss Nils Parasie Daniel Veit Michele Catalano Pablo Chacin Isaac Chao Felix Freitag Leandro Navarro Omer F. Rana Liviu Joita Björn Schnizler Werner Streitberger Torsten Eymann

This report describes the work done and results obtained in third year of the CATNETS project. Experiments carried out with the different configurations of the prototype are reported and simulation results are evaluated with the CATNETS metrics framework. The applicability of the Catallactic approach as market model for service and resource allocation in application layer networks is assessed based on the results and experience gained both from the prototype development and simulations.

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