Michael Rebstock
Darmstadt University of Applied Sciences
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Featured researches published by Michael Rebstock.
Wirtschaftsinformatik und Angewandte Informatik | 2001
Michael Rebstock
We analyze and discuss the state-of-the-art in electronic negotiations. Scientific projects as well as business applications are included into our survey. For our analysis, we use protocol category, degree of automation, number of attributes, number of positions, number of negotiations and mediation type as classification criteria. Projects are categorized and evaluated using these criteria. We find that the focus of application development and the needs of business practice differ. Three major challenges for electronic negotiations theory and practice are identified: degree of automation, application integration and semantic variety.
Computer Standards & Interfaces | 2008
Omid Tafreschi; Dominique Mähler; Janina Fengel; Michael Rebstock; Claudia Eckert
In this paper we first present a system architecture enabling market participants to carry out bilateral and multi-attributive electronic negotiations with each other. Since this system uses open and anonymous communication networks, market participants have to cope with much higher mount of uncertainty about the quality of products and the trustworthiness of other participants. Therefore, we present a reputation system, which facilitates trust building among business partners who interact in an ad-hoc manner with each other. The system enables market participants to rate the business performance of their partners as well as the quality of offered goods. These ratings are the basis for evaluating the trustworthiness of market participants and the quality of their goods. The ratings are aggregated using the concept of Web of Trust. This approach leads to robustness of the proposed system against malicious behavior aiming at manipulating the reputation of market participants.
business process management | 2004
Carlo Simon; Michael Rebstock
For the integration of electronic negotiation systems within information systems, it is essential to model both using the same modelling paradigm to avoid frictions. We develop a generic model of electronic negotiations using Petri nets as a formal base focussing especially on the underlying processes. We introduce a negotiation scenario from which we derive the relevant processes, protocols and information objects, explaining the motivation for negotiations as well. Our approach is modular and allows an extension in various dimensions – however in this paper we concentrate on the idea of integrating electronic negotiations within business processes. As such, our models can be used as formal guide for integrating negotiation environments within workflow management systems and for simulating and verifying electronic negotiation scenarios.
Journal of Cases on Information Technology | 2009
Janina Fengel; Heiko Paulheim; Michael Rebstock
Despite the development of e-business standards, the integration of business processes and business information systems is still a non-trivial issue if business partners use different e-business standards for formatting and describing information to be processed. Since those standards can be understood as ontologies, ontological engineering technologies can be applied for processing, especially ontology matching for reconciling them. However, as e-business standards tend to be rather large-scale ontologies, scalability is a crucial requirement. To serve this demand, we present our ORBI Ontology Mediator. It is linked with our Malasco system for partition-based ontology matching with currently available matching systems, which so far do not scale well, if at all. In our case study we show how to provide dynamic semantic synchronization between business partners using different e-business standards without initial ramp-up effort, based on ontological mapping technology combined with interactive user participation.
International Journal of Software Engineering and Knowledge Engineering | 2014
Christian Schalles; John Creagh; Michael Rebstock
Today, developing the conceptual design of information systems has become inconceivable without the support of graphical models. Models are developed using graph-based modeling languages such as UML. This study focuses on the impact of metamodel properties on different usability attributes in the domain of graphical modeling languages. The study is based on a model of hypotheses including a structural causal model developed under consideration of cognitive theories and usability theory. Survey data is collected and the causal hypotheses are assessed using a structure equation modeling approach. The study shows important findings for practical and theoretical issues of how differing modeling languages are influencing usability attributes on causal stages in the modeling domain. The main focus of this article is to define differences and similarities of how language metaproperties impact usability attributes in model interpretation scenarios.
Praxis Der Wirtschaftsinformatik | 2007
Michael Rebstock; Janina Fengel; Heiko Paulheim; Matthias Knoll
ZusammenfassungenHerkömmliche Projekte der Anwendungs-und Datenintegration befassen sich in der Regel mit statischen Integrationsproblemen. Daten-und Anwendungsstrukturen verändern sich dabei während und nach Abschluss des Integrationsprojektes nicht. In diesen Fällen lassen sich Strukturen und Inhalte mittels statischer Übersetzungstabellen ausreichend zueinander in Beziehung setzen. IT-Systeme und Daten für Geschäftsprozesse mit höherem Dynamikanteil —etwa im Rahmen elektronischer Markttransaktionen — lassen sich auf diese Weise jedoch nicht zufriedenstellend integrieren. In diesem Beitrag wird eine Anwendung auf Basis von Web-Services vorgestellt, die durch Auswertung der Semantik ausgetauschter Informationen auch dynamischen Integrationssituationen gewachsen ist. Für den elektronischen Datenaustausch ermittelt und adaptiert die Anwendung weitgehend eigenständig semantische Beziehungen sowohl für Datenstrukturen als auch für Dateninhalte, ohne dass dazu aufwendige Vorarbeiten notwendig werden. Für das selbstlernende Synchronisationssystem werden Methoden des Ontological Engineering und der künstlichen Intelligenz eingesetzt. Am Beispiel elektronischer Verhandlungsprozesse werden die Integrationsmöglichkeiten praktisch demonstriert.
Wirtschaftsinformatik und Angewandte Informatik | 2003
Michael Rebstock; Michael Lipp
Wir berichten von der Implementierung netzbasierter Kornmunikationsdienste zur Kopplung einer Verhandlungsanwendung an elektronische Marktplatze und betriebliche Anwendungssysteme (ERP-Systeme). Dazu werden zunachst konzeptionelle und technische Grundlagen hinsichtlich Web Services elektronischer Markte und Verhandlungen erlautert. Die den Anwendungskomponenten zugrunde liegende Gesamtanwendungsarchitektur wird vorgestellt. Anschliesend wird das Transaktionsszenario der Dienste aufgezeigt und ein Oberblick uber deren Zusammenspiel gegeben. Danach werden ausgewahlte implementierte Web Services der Anwendung naher dargestellt. Diskussion und Ausblick schliesen den Beitrag ab.
Archive | 2000
Michael Rebstock; Inga Kobrits
In einer empirischen Studie wurde untersucht, wie Kreditinstitute das Medium Internet heute nutzen und welche Anwendungen in den nachsten Jahren geplant sind. Gefragt wurde auserdem, weiche Geschaftsstrategien dem zugrunde liegen, weiche Rolle und welcher Stellenwert dem Internet also zugedacht wird. Schlieslich wurde erhoben, worin Hindernisse fur einen breiten Intemeteinsatz im Bankgeschaft und worin Chancen gesehen werden.
Archive | 2008
Michael Rebstock; Fengel Janina; Heiko Paulheim
electronic commerce and web technologies | 2001
Michael Rebstock