TY - JOUR A1 - Fabian, Benjamin A1 - Kunz, Steffen A1 - Müller, Sebastian A1 - Günther, Oliver T1 - Secure federation of semantic information services JF - Decision support systems : DSS ; the international journal N2 - fundamental challenge for product-lifecycle management in collaborative value networks is to utilize the vast amount of product information available from heterogeneous sources in order to improve business analytics, decision support, and processes. This becomes even more challenging if those sources are distributed across multiple organizations. Federations of semantic information services, combining service-orientation and semantic technologies, provide a promising solution for this problem. However, without proper measures to establish information security, companies will be reluctant to join an information federation, which could lead to serious adoption barriers. Following the design science paradigm, this paper presents general objectives and a process for designing a secure federation of semantic information services. Furthermore, new as well as established security measures are discussed. Here, our contributions include an access-control enforcement system for semantic information services and a process for modeling access-control policies across organizations. In addition, a comprehensive security architecture is presented. An implementation of the architecture in the context of an application scenario and several performance experiments demonstrate the practical viability of our approach. KW - Information federation KW - Service orientation KW - Semantic web KW - Information security Y1 - 2013 U6 - https://doi.org/10.1016/j.dss.2012.05.049 SN - 0167-9236 VL - 55 IS - 1 SP - 385 EP - 398 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Krasnova, Hanna A1 - Veltri, Natasha F. A1 - Spengler, Klaus A1 - Günther, Oliver T1 - "Deal of the Day" Platforms what drives Consumer loyalty? JF - Business & information systems engineering : the international journal of Wirtschaftsinformatik N2 - "Deal of the Day" (DoD) platforms have quickly become popular by offering savings on local services, products and vacations. For merchants, these platforms represent a new marketing channel to advertise their products and services and attract new customers. DoD platform providers, however, struggle to maintaining a stable market share and profitability, because entry and switching costs are low. To sustain a competitive market position, DoD providers are looking for ways to build a loyal customer base. However, research examining the determinants of user loyalty in this novel context is scarce. To fill this gap, this study employs Grounded Theory methodology to develop a conceptual model of customer loyalty to a DoD provider. In the next step, qualitative insights are enriched and validated using quantitative data from a survey of 202 DoD users. The authors find that customer loyalty is in large part driven by monetary incentives, but can be eroded if impressions from merchant encounters are below expectations. In addition, enhancing the share of deals relevant for consumers, i.e. signal-to-noise ratio, and mitigating perceived risks of a transaction emerge as challenges. Beyond theoretical value, the results offer practical insights into how customer loyalty to a DoD provider can be promoted. KW - Deal of the Day KW - Loyalty KW - Grounded theory KW - Structural equation modeling Y1 - 2013 U6 - https://doi.org/10.1007/s12599-013-0268-2 SN - 1867-0202 VL - 5 IS - 3 SP - 165 EP - 177 PB - Springer CY - Heidelberg ER - TY - JOUR A1 - Günther, Oliver A1 - van Putten, Bart-Jan A1 - Brecht, Franziska T1 - Challenges in Business Case Development and Requirements for Business Case Frameworks JF - Supporting Reuse in Business Case Development N2 - Business cases (BC) are often used to support information systems (IS) investment evaluation. Unfortunately, business case development (BCD) is a complex task, especially identifying and quantifying the benefits of a proposed investment. Although today’s business case frameworks (BCF) support BCD to some extent, they have several limitations Y1 - 2013 SN - 978-3-658-01170-3 U6 - https://doi.org/10.1007/978-3-658-01171-0_2 SP - 8 EP - 22 PB - Springer CY - Wiesbaden ER - TY - JOUR A1 - Günther, Oliver A1 - Sütterlin, Sabine A1 - Görlich, Petra A1 - Kampe, Heike A1 - Scheuble, Sabrina A1 - Rost, Sophia A1 - Jäger, Sophie A1 - Eckardt, Barbara A1 - Jaeger, Felix A1 - Zimmermann, Matthias A1 - Hummel, Detlev A1 - Horn-Conrad, Antje T1 - Portal = Herausforderung und Chance: Forschung zum Demografischen Wandel BT - Das Potsdamer Universitätsmagazin N2 - Aus dem Inhalt: - Herausforderung und Chance: Forschung zum Demografischen Wandel - Am Patienten orientiert - Welt der Steine T3 - Portal: Das Potsdamer Universitätsmagazin - 01/2013 Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-440519 SN - 1618-6893 IS - 01/2013 ER - TY - JOUR A1 - Günther, Oliver A1 - Zimmermann, Matthias A1 - Görlich, Petra A1 - Rost, Sophia A1 - Korbach, Rebecca A1 - Eckardt, Barbara A1 - Jäger, Sophie A1 - Szameitat, Ulrike A1 - Schwaibold, Julia A1 - Kampe, Heike T1 - Portal = Historische Zäsur: Jüdische Theologie an Uni Potsdam BT - Das Potsdamer Universitätsmagazin N2 - Aus dem Inhalt: - Historische Zäsur: Jüdische Theologie an Uni Potsdam - Wegen Umbau geöffnet - Eine ungewöhnliche Reise T3 - Portal: Das Potsdamer Universitätsmagazin - 04/2013 Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-440555 SN - 1618-6893 IS - 04/2013 ER - TY - JOUR A1 - Günther, Oliver T1 - Vorwort Y1 - 2013 SN - 978-3-941880-75-7 ER - TY - JOUR A1 - Günther, Oliver T1 - Big Data: What is it? And what does it mean for science, economy and society? JF - Informatik-Spektrum Y1 - 2014 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84897396415&partnerID=MN8TOARS U6 - https://doi.org/10.1007/s00287-014-0783-7 SN - 0170-6012 VL - 37 IS - 2 SP - 85 EP - 86 PB - Springer Verlag CY - Heidelberg ER - TY - JOUR A1 - Günther, Oliver A1 - Sütterlin, Sabine A1 - Görlich, Petra A1 - Eckardt, Barbara A1 - Mangelsdorf, Birgit A1 - Horn-Conrad, Antje A1 - Brückner, Cornelia A1 - Lux, Nadine A1 - Szameitat, Ulrike A1 - Weller, Nina A1 - Kagels, Melanie A1 - Stahl, Anna-Lena A1 - Temme, Jens A1 - Jäger, Sophie A1 - Kampe, Heike A1 - Zimmermann, Matthias T1 - Portal = Auf Humboldts Spuren: Feldforschung an der Universität Potsdam BT - Das Potsdamer Universitätsmagazin N2 - Aus dem Inhalt: - Auf Humboldts Spuren: Feldforschung an der Universität Potsdam - Bevor es knallt - Kein Kommentar! T3 - Portal: Das Potsdamer Universitätsmagazin - 02/2014 Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-440607 SN - 1618-6893 IS - 02/2014 ER - TY - JOUR A1 - Günther, Oliver A1 - Weller, Nina A1 - Jäger, Sophie A1 - Grabsch, Gabriele A1 - Eckardt, Barbara A1 - Sütterlin, Sabine A1 - Kampe, Heike A1 - Szameitat, Ulrike A1 - Lange, Ruth A1 - Zimmermann, Matthias A1 - Horn-Conrad, Antje T1 - Portal = Investition in die Zukunft: Forschung für die digitale Gesellschaft BT - Das Potsdamer Universitätsmagazin N2 - Aus dem Inhalt: - Investition in die Zukunft: Forschung für die digitale Gesellschaft - Doppelt stark - Eine für alles T3 - Portal: Das Potsdamer Universitätsmagazin - 01/2014 Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-442712 SN - 1618-6893 IS - 01/2014 ER - TY - JOUR A1 - Schmidt, Anna A1 - Eckardt, Barbara A1 - Marszałek, Magdalena A1 - Görlich, Petra A1 - Bieber, Sabine A1 - Kampe, Heike A1 - Jäger, Sophie A1 - Horn-Conrad, Antje A1 - Günther, Oliver A1 - Seckler, Robert A1 - Seppä, Silvana A1 - Guske, Katja A1 - Szameitat, Ulrike A1 - Bezzenberger, Tilman A1 - Sütterlin, Sabine A1 - Weller, Nina A1 - Klauke, Lars T1 - Portal = Sommer an der Uni: Leere Hörsäle? Volle Terminkalender! BT - Das Potsdamer Universitätsmagazin N2 - Aus dem Inhalt: - Sommer an der Uni: Leere Hörsäle? Volle Terminkalender! - Stärken stärken - Unter Stress T3 - Portal: Das Potsdamer Universitätsmagazin - 03/2014 Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-443021 IS - 03/2014 ER -