@article{KrasnovaVeltriGuenther2012, author = {Krasnova, Hanna and Veltri, Natasha F. and G{\"u}nther, Oliver}, title = {Self-disclosure and privacy calculus on social networking sites the role of culture intercultural dynamics of privacy calculus}, series = {Business \& information systems engineering : the international journal of Wirtschaftsinformatik}, volume = {4}, journal = {Business \& information systems engineering : the international journal of Wirtschaftsinformatik}, number = {3}, publisher = {Springer}, address = {Heidelberg}, issn = {1867-0202}, doi = {10.1007/s12599-012-0216-6}, pages = {127 -- 135}, year = {2012}, abstract = {Social Network Sites (SNSs) rely exclusively on user-generated content to offer engaging and rewarding experience to its members. As a result, stimulating user communication and self-disclosure is vital for the sustainability of SNSs. However, considering that the SNS users are increasingly culturally diverse, motivating this audience to self-disclose requires understanding of their cultural intricacies. Yet existing research offers only limited insights into the role of culture behind the motivation of SNS users to self-disclose. Building on the privacy calculus framework, this study explores the role of two cultural dimensions - individualism and uncertainty avoidance - in self-disclosure decisions of SNS users. Survey responses of US and German Facebook members are used as the basis for our analysis. Structural equation modeling and multi-group analysis results reveal the distinct role of culture in the cognitive patterns of SNS users. The authors find that trusting beliefs play a key role in the self-disclosure decisions of users from individualistic cultures. At the same time, uncertainty avoidance determines the impact of privacy concerns. This paper contributes to the theory by rejecting the universal nature of privacy calculus processes. The findings provide for an array of managerial implications for SNS providers as they strive to encourage content creation and sharing by their heterogeneous members.}, language = {en} } @article{FabianKunzMuelleretal.2013, author = {Fabian, Benjamin and Kunz, Steffen and M{\"u}ller, Sebastian and G{\"u}nther, Oliver}, title = {Secure federation of semantic information services}, series = {Decision support systems : DSS ; the international journal}, volume = {55}, journal = {Decision support systems : DSS ; the international journal}, number = {1}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0167-9236}, doi = {10.1016/j.dss.2012.05.049}, pages = {385 -- 398}, year = {2013}, abstract = {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.}, language = {en} } @article{GuentherSchueleZurelletal.2023, author = {G{\"u}nther, Oliver and Sch{\"u}le, Manja and Zurell, Damaris and Jeltsch, Florian and Roeleke, Manuel and Kampe, Heike and Zimmermann, Matthias and Scholz, Jana and Mikulla, Stefanie and Engbert, Ralf and Elsner, Birgit and Schlangen, David and Agrofylax, Luisa and Georgi, Doreen and Weymar, Mathias and Wagener, Thorsten and Bookhagen, Bodo and Eibl, Eva P. S. and Korup, Oliver and Oswald, Sascha and Thieken, Annegret and van der Beek, Peter}, title = {Portal Wissen = Excellence}, series = {Portal Wissen: The research magazine of the University of Potsdam}, journal = {Portal Wissen: The research magazine of the University of Potsdam}, number = {02/2023}, issn = {2198-9974}, doi = {10.25932/publishup-61145}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-611456}, pages = {58}, year = {2023}, abstract = {When something is not just good or very good, we often call it excellent. But what does that really mean? Coming from the Latin word "excellere," it describes things, persons, or actions that are outstanding or superior and distinguish themselves from others. It cannot get any better. Excellence is the top choice for being the first or the best. Research is no exception. At the university, you will find numerous exceptional researchers, outstanding projects, and, time and again, sensational findings, publications, and results. But is the University of Potsdam also excellent? A question that will certainly create a different stir in 2023 than it did perhaps 20 years ago. Since the launch of the Excellence Initiative in 2005, universities that succeed in winning the most comprehensive funding program for research in Germany have been considered - literally - excellent. Whether in the form of graduate schools, research clusters, or - since the program was continued in 2019 under the title "Excellence Strategy" - entire universities of excellence: Anyone who wants to be among the best research universities needs the seal of excellence. The University of Potsdam is applying for funding with three cluster proposals in the recently launched new round of the "Excellence Strategy of the German Federal and State Governments." One proposal comes from ecology and biodiversity research. The aim is to paint a comprehensive picture of ecological processes by examining the role of single individuals as well as the interactions among many species in an ecosystem to precisely determine the function of biodiversity. A second proposal has been submitted by the cognitive sciences. Here, the complex coexistence of language and cognition, development and learning, as well as motivation and behavior will be researched as a dynamic interrelation. The projects will include cooperation with the educational sciences to constantly consider linked learning and educational processes. The third proposal from the geo and environmental sciences concentrates on extreme and particularly devastating natural hazards and processes such as floods and droughts. The researchers examine these extreme events, focusing on their interaction with society, to be able to better assess the risks and damages they might involve and to initiate timely measures in the future. "All three proposals highlight the excellence of our performance," emphasizes University President Prof. Oliver G{\"u}nther, Ph.D. "The outlines impressively document our commitment, existing research excellence, and the potential of the University of Potsdam as a whole. The fact that three powerful consortia have come together in different subject areas shows that we have taken a good step forward on our way to becoming one of the top German universities." In this issue, we are looking at what is in and behind these proposals: We talked to the researchers who wrote them. We asked them about their plans in case their proposals are successful and they bring a cluster of excellence to the university. But we also looked at the research that has led to the proposals, has long shaped the university's profile, and earned it national and international recognition. We present a small selection of projects, methods, and researchers to illustrate why there really is excellent research in these proposals! By the way, "excellence" is also not the end of the flagpole. After all, the adjective "excellent" even has a comparative and a superlative. With this in mind, I wish you the most excellent pleasure reading this issue!}, language = {en} } @article{Guenther2012, author = {G{\"u}nther, Oliver}, title = {More politics in the GI - More GI in politics}, series = {Informatik-Spektrum}, volume = {35}, journal = {Informatik-Spektrum}, number = {6}, doi = {10.1007/s00287-012-0657-9}, pages = {397 -- 398}, year = {2012}, language = {en} } @article{GuentherLeopoldMendling2016, author = {G{\"u}nther, Oliver and Leopold, Henrik and Mendling, Jan}, title = {Learning from quality issues of BPMN models from industry}, series = {CEUR Workshop Proceedings}, volume = {1701}, journal = {CEUR Workshop Proceedings}, issn = {1613-0073}, pages = {36 -- 38}, year = {2016}, abstract = {Many organizations use business process models for documenting their business operations. In recent years, the Business Process Model and Notation (BPMN) evolved into the leading standard for process modeling. However, BPMN is complex: The specification offers a huge variety of different elements and often several representational choices for the same semantics. This raises the question of how well modelers can deal with these choices. Empirical insights into BPMN usage from the perspective of practitioners are still missing. We close this gap by analyzing a large set of BPMN 2.0 process models from practice. We found that particularly representational choices for splits and joins, the correct use of message flow, the proper decomposition of models, and the consistent labeling appear to be connected with quality issues. Based on our findings we give five recommendations how these issues can be avoided in the future. The work summarized in this extended abstract has been published in [LMG16].}, language = {en} } @article{GuentherLeopoldMendling2016, author = {G{\"u}nther, Oliver and Leopold, Henrik and Mendling, Jan}, title = {Learning from quality issues of BPMN models from industry}, series = {IEEE Software}, volume = {33}, journal = {IEEE Software}, number = {4}, publisher = {Inst. of Electr. and Electronics Engineers}, address = {Los Alamitos}, issn = {0740-7459}, doi = {10.1109/MS.2015.81}, pages = {26 -- 33}, year = {2016}, abstract = {Many organizations use business process models to document business operations and formalize business requirements in software-engineering projects. The Business Process Model and Notation (BPMN), a specification by the Object Management Group, has evolved into the leading standard for process modeling. One challenge is BPMN's complexity: it offers a huge variety of elements and often several representational choices for the same semantics. This raises the question of how well modelers can deal with these choices. Empirical insights into BPMN use from the practitioners' perspective are still missing. To close this gap, researchers analyzed 585 BPMN 2.0 process models from six companies. They found that split and join representations, message flow, the lack of proper model decomposition, and labeling related to quality issues. They give five specific recommendations on how to avoid these issues.}, language = {en} } @article{WinklerGoebelBidaultetal.2012, author = {Winkler, Till J. and Goebel, Christoph and Bidault, Francis and G{\"u}nther, Oliver}, title = {Information technology and business practieses in Germany}, series = {The UCLA Anderson Business and Information Technologies (BIT) Project}, journal = {The UCLA Anderson Business and Information Technologies (BIT) Project}, publisher = {world scientific}, address = {Singapore}, doi = {10.1142/9789814390880_0005}, pages = {81 -- 114}, year = {2012}, language = {en} } @article{GuentherBrechtEckhardtetal.2012, author = {G{\"u}nther, Oliver and Brecht, Franziska and Eckhardt, Andreas and Berger, Christian}, title = {Corporate career presences on social network sites: an analysis of hedonic and utilitarian value}, series = {CHI '12 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems}, journal = {CHI '12 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems}, publisher = {ACM}, address = {Texas}, isbn = {978-1-4503-1015-4}, doi = {10.1145/2207676.2208408}, pages = {2441 -- 2450}, year = {2012}, abstract = {Due to the shortage of skilled workforce and the increasing usage of social network sites, companies increasingly apply social network sites to attract potential applicants. This paper explores how corporate career presences on network sites should be realized in order to attract potential applicants. Therefore, we tested the impact of seven individual characteristics (namely Appointments, Daily Working Routine, Jobs, Corporate News, Entertainment, Media Format, and Features) of these corporate career presences that we extracted by a comprehensive pre-study on users' perceived hedonic and utilitarian value of these presences on social network sites. Based on an online survey with 470 participants, the results reveal a highly significant impact of five characteristics that corporate career presences provide both a hedonic as well as a utilitarian value to the user}, language = {en} } @article{GuenthervanPuttenBrecht2013, author = {G{\"u}nther, Oliver and van Putten, Bart-Jan and Brecht, Franziska}, title = {Challenges in Business Case Development and Requirements for Business Case Frameworks}, series = {Supporting Reuse in Business Case Development}, journal = {Supporting Reuse in Business Case Development}, publisher = {Springer}, address = {Wiesbaden}, isbn = {978-3-658-01170-3}, doi = {10.1007/978-3-658-01171-0_2}, pages = {8 -- 22}, year = {2013}, abstract = {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}, language = {en} } @article{Guenther2014, author = {G{\"u}nther, Oliver}, title = {Big Data: What is it? And what does it mean for science, economy and society?}, series = {Informatik-Spektrum}, volume = {37}, journal = {Informatik-Spektrum}, number = {2}, publisher = {Springer Verlag}, address = {Heidelberg}, issn = {0170-6012}, doi = {10.1007/s00287-014-0783-7}, pages = {85 -- 86}, year = {2014}, language = {en} } @article{FabianKunzKonnegenetal.2012, author = {Fabian, Benjamin and Kunz, Steffen and Konnegen, Marcel and M{\"u}ller, Sebastian and G{\"u}nther, Oliver}, title = {Access control for semantic data federations in industrial product-lifecycle management}, series = {Computers in industry : an international, application oriented research journal}, volume = {63}, journal = {Computers in industry : an international, application oriented research journal}, number = {9}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0166-3615}, doi = {10.1016/j.compind.2012.08.015}, pages = {930 -- 940}, year = {2012}, abstract = {Information integration across company borders becomes increasingly important for the success of product lifecycle management in industry and complex supply chains. Semantic technologies are about to play a crucial role in this integrative process. However, cross-company data exchange requires mechanisms to enable fine-grained access control definition and enforcement, preventing unauthorized leakage of confidential data across company borders. Currently available semantic repositories are not sufficiently equipped to satisfy this important requirement. This paper presents an infrastructure for controlled sharing of semantic data between cooperating business partners. First, we motivate the need for access control in semantic data federations by a case study in the industrial service sector. Furthermore, we present an architecture for controlling access to semantic repositories that is based on our newly developed SemForce security service. Finally, we show the practical feasibility of this architecture by an implementation and several performance experiments.}, language = {en} } @article{KrasnovaVeltriSpengleretal.2013, author = {Krasnova, Hanna and Veltri, Natasha F. and Spengler, Klaus and G{\"u}nther, Oliver}, title = {"Deal of the Day" Platforms what drives Consumer loyalty?}, series = {Business \& information systems engineering : the international journal of Wirtschaftsinformatik}, volume = {5}, journal = {Business \& information systems engineering : the international journal of Wirtschaftsinformatik}, number = {3}, publisher = {Springer}, address = {Heidelberg}, issn = {1867-0202}, doi = {10.1007/s12599-013-0268-2}, pages = {165 -- 177}, year = {2013}, abstract = {"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.}, language = {en} }