@inproceedings{5594, abstract = {{Design science is a fundamental research stream that contends its position in the information systems discipline. While ongoing debates address the relative importance of design science contributions in the information systems community, insights into the scientific impact of design science research (DSR) are missing and this lack of understanding arguably poses challenges to an informed discourse. To identify the most influential papers and those factors that explain their scientific impact, this paper presents an exploratory study of the scientific impact of DSR papers published in the AIS Senior Scholars' Basket of Journals. We uncover the current DSR landscape by taking stock of influential papers and theories and develop a model to explain the scientific impact of DSR papers. Our findings show that scientific impact is significantly explained by theorization and novelty. We discuss how the implications of our work can be projected on the overarching discourse on DSR.}}, author = {{Wagner, Gerit and Prester, Julian and Schryen, Guido}}, booktitle = {{38th International Conference on Information Systems}}, location = {{Seoul, South Korea}}, title = {{{Exploring the Scientific Impact of Information Systems Design Science Research: A Scientometric Study}}}, year = {{2017}}, } @article{5626, author = {{Schryen, Guido and Hristova, Diana}}, journal = {{Smart Data Radar (Deutsche Bank)}}, title = {{{High-Performance Business Computing - Effizienzsteigerung durch Parallelisierung}}}, year = {{2017}}, } @article{5633, abstract = {{Literature reviews (LRs) are recognized for their increasing impact in the information systems literature. Methodologists have drawn attention to the question of how we can leverage the value of LRs to preserve and generate knowledge. The panelists who participated in the discussion of ?Standalone Literature Reviews in IS Research: What Can Be Learnt from the Past and Other Fields?? at ICIS 2016 in Dublin acknowledged this significant issue and debated a) what the IS field can learn from other fields and where IS-specific challenges occur, b) how the IS field should move forward to foster the genre of LRs, and c) what best practices are to train doctoral IS students in publishing LRs. This article reports the key takeaways of this panel discussion. Guidance for IS scholars is provided on how to conduct LRs that contribute to the cumulative knowledge development within and across the IS field to best prepare the next generation of IS scholars.}}, author = {{Schryen, Guido and Benlian, Alexander and Rowe, Frantz and Shirley, Gregor and Larsen, Kai and Petter, Stacie and Par{\'e}, Guy and Wagner, Gerit and Haag, Steffi and Yasasin, Emrah}}, issn = {{1529-3181}}, journal = {{Communications of the AIS}}, keywords = {{Literature Review, Review Methodology, Research Methodology, Doctoral Training}}, pages = {{557 -- 569}}, publisher = {{Association for Information Systems (AIS)}}, title = {{{Literature Reviews in IS Research: What Can Be Learnt from the Past and Other Fields?}}}, volume = {{40}}, year = {{2017}}, } @article{5671, abstract = {{Multi-attribute value theory (MAVT)-based recommender systems have been proposed for dealing with issues of existing recommender systems, such as the cold-start problem and changing preferences. However, as we argue in this paper, existing MAVT-based methods for measuring attribute importance weights do not fit the shopping tasks for which recommender systems are typically used. These methods assume well-trained decision makers who are willing to invest time and cognitive effort, and who are familiar with the attributes describing the available alternatives and the ranges of these attribute levels. Yet, recommender systems are most often used by consumers who are usually not familiar with the available attributes and ranges and who wish to save time and effort. Against this background, we develop a new method, based on a product configuration process, which is tailored to the characteristics of these particular decision makers. We empirically compare our method to SWING, ranking-based conjoint analysis and TRADEOFF in a between-subjects laboratory experiment with 153 participants. Results indicate that our proposed method performs better than TRADEOFF and CONJOINT and at least as well as SWING in terms of recommendation accuracy, better than SWING and TRADEOFF and at least as well as CONJOINT in terms of cognitive load, and that participants were faster with our method than with any other method. We conclude that our method is a promising option to help support consumers' decision processes in e-commerce shopping tasks.}}, author = {{Scholz, Michael and Dorner, Verena and Schryen, Guido and Benlian, Alexander}}, journal = {{European Journal of Operational Research}}, keywords = {{E-Commerce, Recommender System, Attribute Weights, Configuration System, Decision Support}}, number = {{1}}, pages = {{205 -- 215}}, publisher = {{Elsevier}}, title = {{{A configuration-based recommender system for supporting e-commerce decisions}}}, volume = {{259}}, year = {{2017}}, } @inbook{14857, author = {{Beckschäfer, Michaela and Malberg, Simon and Tierney, Kevin and Weskamp, Christoph}}, booktitle = {{Lecture Notes in Computer Science}}, isbn = {{9783319684956}}, issn = {{0302-9743}}, title = {{{Simulating Storage Policies for an Automated Grid-Based Warehouse System}}}, doi = {{10.1007/978-3-319-68496-3_31}}, year = {{2017}}, } @article{5676, author = {{Rauchecker, Gerhard and Schryen, Guido}}, journal = {{Im Einsatz}}, pages = {{44--46}}, publisher = {{Stumpf & Kossendey}}, title = {{{Projekt KUBAS: Koordination ungebundener Vor-Ort-Helfer}}}, volume = {{23}}, year = {{2016}}, } @inproceedings{5595, author = {{Wagner, Gerit and Prester, Julian and Roche, Maria and Benlian, Alexander and Schryen, Guido}}, booktitle = {{International Conference on Information Systems}}, title = {{{Factors Affecting the Scientific Impact of Literature Reviews: A Scientometric Study}}}, year = {{2016}}, } @article{5617, abstract = {{CAPTCHAs are challenge-response tests that aim at preventing unwanted machines, including bots, from accessing web services while providing easy access for humans. Recent advances in artificial-intelligence based attacks show that the level of security provided by many state-of-the-art text-based CAPTCHAs is declining. At the same time, techniques for distorting and obscuring the text, which are used to maintain the level of security, make text-based CAPTCHAs diffcult to solve for humans, and thereby further degrade usability. The need for developing alternative types of CAPTCHAs which improve both, the current security and usability levels, has been emphasized by several researchers. With this study, we contribute to research through (1) the development of two new face recognition CAPTCHAs (Farett-Gender and Farett-Gender&Age), (2) the security analysis of both procedures, and (3) the provision of empirical evidence that one of the suggested CAPTCHAs (Farett-Gender) is similar to Google's reCAPTCHA and better than KCAPTCHA concerning effectiveness (error rates), superior to both regarding learnability and satisfaction but not effciency.}}, author = {{Schryen, Guido and Wagner, Gerit and Schlegel, Alexander}}, journal = {{Computers & Security}}, keywords = {{CAPTCHA, Usability, Facial features, Gender classiffcation, Age classification, Face recognition reverse Turing test}}, number = {{July}}, pages = {{95--116}}, publisher = {{Elsevier}}, title = {{{Development of two novel face-recognition CAPTCHAs: a security and usability study}}}, volume = {{60}}, year = {{2016}}, } @inproceedings{5678, abstract = {{Many academic disciplines - including information systems, computer science, and operations management - face scheduling problems as important decision making tasks. Since many scheduling problems are NP-hard in the strong sense, there is a need for developing solution heuristics. For scheduling problems with setup times on unrelated parallel machines, there is limited research on solution methods and to the best of our knowledge, parallel computer architectures have not yet been taken advantage of. We address this gap by proposing and implementing a new solution heuristic and by testing different parallelization strategies. In our computational experiments, we show that our heuristic calculates near-optimal solutions even for large instances and that computing time can be reduced substantially by our parallelization approach.}}, author = {{Rauchecker, Gerhard and Schryen, Guido}}, booktitle = {{Australasian Conference on Information Systems}}, keywords = {{scheduling, decision support, heuristic, high performance computing, parallel algorithms}}, pages = {{1--13}}, title = {{{High-Performance Computing for Scheduling Decision Support: A Parallel Depth-First Search Heuristic}}}, year = {{2015}}, } @article{5679, abstract = {{Cloud computing promises the flexible delivery of computing services in a pay-as-you-go manner. It allows customers to easily scale their infrastructure and save on the overall cost of operation. However Cloud service offerings can only thrive if customers are satisfied with service performance. Allow-ing instantaneous access and flexible scaling while maintaining the service levels and offering competitive prices poses a significant challenge to Cloud Computing providers. Furthermore services will remain available in the long run only if this business generates a stable revenue stream. To address these challenges we introduce novel policy-based service admission control mod-els that aim at maximizing the revenue of Cloud providers while taking in-formational uncertainty regarding resource requirements into account. Our evaluation shows that policy-based approaches statistically significantly out-perform first come first serve approaches, which are still state of the art. Furthermore the results give insights in how and to what extent uncertainty has a negative impact on revenue.}}, author = {{Püschel, Tim and Schryen, Guido and Hristova, Diana and Neumann, Dirk}}, journal = {{European Journal of Operational Research}}, keywords = {{admission control, informational uncertainty, revenue management, cloud computing}}, number = {{2}}, pages = {{637--647}}, publisher = {{Elsevier}}, title = {{{Revenue Management for Cloud Computing Providers: Decision Models for Service Admission Control under Non-probabilistic Uncertainty}}}, volume = {{244}}, year = {{2015}}, } @inproceedings{5541, author = {{Yasasin, Emrah and Schryen, Guido}}, booktitle = {{23rd European Conference on Information Systems (ECIS 2015)}}, title = {{{Requirements for IT Security Metrics - An Argumentation Theory Based Approach}}}, year = {{2015}}, } @inproceedings{5588, abstract = {{The protection of information technology (IT) has become and is predicted to remain a key economic challenge for organizations. While research on IT security investment is fast growing, it lacks a theoretical basis for structuring research, explaining economic-technological phenomena and guide future research. We address this shortcoming by suggesting a new theoretical model emerging from a multi-theoretical perspective adopt-ing the Resource-Based View and the Organizational Learning Theory. The joint appli-cation of these theories allows to conceptualize in one theoretical model the organiza-tional learning effects that occur when the protection of organizational resources through IT security countermeasures develops over time. We use this model of IT security invest-ments to synthesize findings of a large body of literature and to derive research gaps. We also discuss managerial implications of (closing) these gaps by providing practical ex-amples.}}, author = {{Weishäupl, Eva and Yasasin, Emrah and Schryen, Guido}}, booktitle = {{International Conference on Information Systems}}, keywords = {{Information Security, Investment, Literature review, Resource-based View, Organi-zational Learning Theory, Multi-theoretical Perspective}}, title = {{{A Multi-Theoretical Literature Review on Information Security Investments using the Resource-Based View and the Organizational Learning Theory}}}, year = {{2015}}, } @inproceedings{5589, author = {{Weishäupl, Eva and Yasasin, Emrah and Schryen, Guido}}, booktitle = {{23rd European Conference on Information Systems (ECIS 2015)}}, title = {{{IT Security Investments Through the Lens of the Resource-Based View: A new Theoretical Model and Literature Review}}}, year = {{2015}}, } @inproceedings{5590, abstract = {{Nowadays, providing employees with failure-free access to various systems, applications and services is a crucial factor for organizations? success as disturbances potentially inhibit smooth workflows and thereby harm productivity. However, it is a challenging task to assign access rights to employees? accounts within a satisfying time frame. In addition, the management of multiple accounts and identities can be very onerous and time consuming for the responsible administrator and therefore expensive for the organization. In order to meet these challenges, firms decide to invest in introducing an Identity and Access Management System (IAMS) that supports the organization by using policies to assign permissions to accounts, groups, and roles. In practice, since various versions of IAMSs exist, it is a challenging task to decide upon introduction of an IAMS. The following study proposes a first attempt of a decision support model for practitioners which considers four alternatives: Introduction of an IAMS with Role-based Access Control RBAC) or without and no introduction of IAMS again with or without RBAC. To underpin the practical applicability of the proposed model, we parametrize and operationalize it based on a real world use case using input from an expert interview.}}, author = {{Weishäupl, Eva and Kunz, Michael and Yasasin, Emrah and Wagner, Gerit and Prester, Julian and Schryen, Guido and Pernul, Günther}}, booktitle = {{2nd International Workshop on Security in highly connected IT Systems (SHCIS?15)}}, keywords = {{Identity and Access Management, Economic Decision Making, Information Systems, Information Security Investment, Decision Theory}}, title = {{{Towards an Economic Approach to Identity and Access Management Systems Using Decision Theory}}}, year = {{2015}}, } @article{5616, author = {{Schryen, Guido and Weishäupl, Eva}}, journal = {{Managementkompass}}, number = {{2}}, pages = {{17--18}}, publisher = {{Frankfurt Business Media, Der F.A.Z.-Fachverlag}}, title = {{{IT-Sicherheit: Ökonomisch Planen und Bewerten}}}, year = {{2015}}, } @inproceedings{5618, abstract = {{Literature reviews play an important role in the development of knowledge. Yet, we observe a lack of theoretical underpinning of and epistemological insights into how literature reviews can contribute to knowledge creation and have actually contributed in the IS discipline. To address these theoretical and empirical research gaps, we suggest a novel epistemological model of literature reviews. This model allows us to align different contributions of literature reviews with their underlying knowledge conversions - thereby building a bridge between the previously largely unconnected fields of literature reviews and epistemology. We evaluate the appropriateness of the model by conducting an empirical analysis of 173 IS literature reviews which were published in 39 pertinent IS journals between 2000 and 2014. Based on this analysis, we derive an epistemological taxonomy of IS literature reviews, which complements previously suggested typologies.}}, author = {{Schryen, Guido and Wagner, Gerit and Benlian, Alexander}}, booktitle = {{International Conference on Information Systems (ICIS)}}, keywords = {{Literature review, Research methods/methodology, Theory of knowledge}}, title = {{{Theory of Knowledge for Literature Reviews: An Epistemological Model, Taxonomy and Empirical Analysis of IS Literature}}}, year = {{2015}}, } @article{5622, author = {{Schryen, Guido and Rauchecker, Gerhard and Comes, Martina}}, journal = {{Business & Information Systems Engineering (BISE)}}, number = {{4}}, pages = {{243--259}}, publisher = {{Springer}}, title = {{{Resource Planning in Disaster Response - Decision Support Models and Methodologies}}}, volume = {{57}}, year = {{2015}}, } @article{5634, author = {{Schryen, Guido}}, journal = {{Communications of the AIS}}, number = {{Art 12}}, pages = {{286--325}}, publisher = {{Association for Information Systems (AIS); Association for Computing Machinery (ACM)}}, title = {{{Writing qualitative IS literature reviews ? Guidelines for synthesis, interpretation and guidance of research}}}, volume = {{37}}, year = {{2015}}, } @inproceedings{5672, author = {{Rauchecker, Gerhard and Yasasin, Emrah and Schryen, Guido}}, booktitle = {{11th International Conference on Trust, Privacy, and Security in Digital Business (TRUSTBUS)}}, title = {{{A Decision Support System for IT Security Incident Management}}}, year = {{2014}}, } @article{5686, author = {{Fink, Andreas and Kliewer, Natalia and Mattfeld, Dirk and Mönch, Lars and Rothlauf, Franz and Schryen, Guido and Suhl, Leena and Voß, Stefan}}, journal = {{Business & Information Systems Engineering (BISE)}}, number = {{1}}, pages = {{17--24}}, publisher = {{Gabler}}, title = {{{Model-based Decision Support in Manufacturing and Service Networks}}}, volume = {{6}}, year = {{2014}}, } @article{5687, author = {{Fink, Andreas and Kliewer, Natalia and Mattfeld, Dirk and Mönch, Lars and Rothlauf, Franz and Schryen, Guido and Suhl, Lena and Voß, Stefan}}, journal = {{Wirtschaftsinformatik}}, number = {{1}}, pages = {{21--29}}, publisher = {{Gabler}}, title = {{{Modellbasierte Entscheidungsunterstützung in Produktions- und Service-Netzwerken}}}, volume = {{56}}, year = {{2014}}, } @techreport{6197, author = {{Schryen, Guido}}, title = {{{The Epistemological Impact of Literature Reviews in Information Systems Research}}}, year = {{2014}}, } @inproceedings{5573, author = {{Yasasin, Emrah and Rauchecker, Gerhard and Prester, Julian and Schryen, Guido}}, booktitle = {{1st Workshop on Security in highly connected IT systems (SHCIS 14)}}, title = {{{A Fuzzy Security Investment Decision Support Model for Highly Distributed Systems}}}, year = {{2014}}, } @article{5585, author = {{Wex, Felix and Schryen, Guido and Feuerriegel, Stefan and Neumann, Dirk}}, journal = {{European Journal of Operational Research}}, publisher = {{Elsevier}}, title = {{{Emergency Response in Natural Disaster Management: Allocation and Scheduling of Rescue Units}}}, year = {{2014}}, } @article{5614, abstract = {{Natural disasters, including earthquakes, Tsunamis, floods, hurricanes, and volcanic eruptions, have caused tremendous harm and continue to threaten millions of humans and various infrastructure capabilities each year. In their efforts to take countermeasures against the threats posed by future natural disasters, the United Nations formulated the ?Hyogo Framework for Action?, which aims at assessing and reducing risk. This framework and a global review of disaster reduction initiatives of the United Nations acknowledge the need for information systems research contributions in addressing major challenges of natural disaster management. In this paper, we provide a review of the literature with regard to how information systems research has addressed risk assessment and reduction in natural disaster management. Based on the review we identify research gaps that are centered around the need for acquiring general knowledge on how to design IS artifacts for risk assessment and reduction. In order to close these gaps in further research, we develop a research agenda that follows the IS design science paradigm.}}, author = {{Schryen, Guido and Wex, Felix}}, journal = {{International Journal of Information Systems for Crisis Response and Management (IJISCRAM)}}, keywords = {{Natural Disaster Management, Risk Reduction, Hyogo Framework, IS Design Science, Literature review}}, number = {{1}}, title = {{{Risk Reduction in Natural Disaster Management Through Information Systems: A Literature review and an IS design science research agenda}}}, volume = {{6}}, year = {{2014}}, } @article{5627, author = {{Schryen, Guido and Hristova, Diana}}, journal = {{OR -Spectrum}}, number = {{1}}, pages = {{1--48}}, publisher = {{Springer}}, title = {{{Duality in fuzzy linear programming: A survey}}}, volume = {{37}}, year = {{2014}}, } @article{5636, author = {{Schryen, Guido}}, journal = {{Communications of the AIS}}, title = {{{Writing qualitative IS literature reviews ? Guidelines for synthesis, interpretation and guidance of research}}}, year = {{2014}}, } @article{5682, author = {{de Meer, Hermann and Diener, Michael and Herkenhöner, Ralph and Kucera, Markus and Niedermeier, Michael and Reisser, Andreas and Schryen, Guido and Vetter, Michael and Waas, Thomas and Yasasin, Emrah}}, journal = {{PIK - Praxis der Informationsverarbeitung und Kommunikation}}, number = {{3}}, pages = {{153--159}}, publisher = {{de Gruyter}}, title = {{{Sicherheitsherausforderungen in hochverteilten Systemen}}}, volume = {{36}}, year = {{2013}}, } @article{6166, author = {{Wex, Felix and Schryen, Guido}}, journal = {{Blick in die Wissenschaft}}, number = {{28}}, pages = {{27--32}}, title = {{{Effektiver Einsatz von Rettungskräften bei Naturkatastrophen - Modelle und Verfahren zur Entscheidungsunterstützung}}}, year = {{2013}}, } @article{5575, author = {{Wex, Felix and Schryen, Guido and Neumann, Dirk}}, journal = {{International Journal of Information Systems for Crisis Response and Management}}, number = {{4}}, pages = {{63--80}}, publisher = {{IGI Publ.}}, title = {{{Assignments of Collaborative Rescue Units during Emergency Response}}}, volume = {{5}}, year = {{2013}}, } @inproceedings{5576, author = {{Wex, Felix and Schryen, Guido and Neumann, Dirk}}, booktitle = {{Proceedings of the 46th Hawaii International Conference on System Science}}, title = {{{Decision Modeling for Assignments of Collaborative Rescue Units during Emergency Response}}}, year = {{2013}}, } @article{5637, author = {{Schryen, Guido}}, journal = {{European Journal of Information Systems (EJIS)}}, number = {{2}}, pages = {{139--169}}, title = {{{Revisiting IS Business Value Research: What we already know, what we still need to know, and how we can get there}}}, volume = {{22}}, year = {{2013}}, } @inproceedings{5680, author = {{Püschel, Tim and Schryen, Guido and Hristova, Diana and Neumann, Dirk}}, booktitle = {{European Conference on Information Systems}}, title = {{{Cloud Service Revenue Management}}}, year = {{2012}}, } @inproceedings{5683, author = {{Lang, Fabian and Schryen, Guido and Fink, Andreas}}, booktitle = {{International Conference on Information Systems}}, title = {{{Elicitating, modeling, and processing uncertain human preferences for software agents in electronic negotiations: An empirical study}}}, year = {{2012}}, } @article{5688, author = {{Bodenstein, Christian and Schryen, Guido and Neumann, Dirk}}, journal = {{European Journal of Operational Research : EJOR}}, number = {{1}}, pages = {{157--167}}, publisher = {{Elsevier}}, title = {{{Energy-Aware Workload Management Models for Operating Cost Reduction in Data Centers}}}, volume = {{222}}, year = {{2012}}, } @article{5578, author = {{Wex, Felix and Schryen, Guido and Neumann, Dirk}}, journal = {{International Journal of Information Systems for Crisis Response and Management}}, number = {{3}}, pages = {{23--41}}, publisher = {{IGI Publ.}}, title = {{{A Fuzzy Decision Support Model for Natural Disaster Response under Informational Uncertainty}}}, volume = {{4}}, year = {{2012}}, } @inproceedings{5579, author = {{Wex, Felix and Schryen, Guido and Neumann, Dirk}}, booktitle = {{International Conference on Information Systems for Crisis Response and Management (ISCRAM) 2012}}, title = {{{Operational Emergency Response under Informational Uncertainty: A Fuzzy Optimization Model for Scheduling and Allocating Rescue Units}}}, year = {{2012}}, } @inproceedings{5615, author = {{Schryen, Guido and Wex, Felix}}, booktitle = {{45th Hawaii International Conference on System Sciences}}, title = {{{IS Design Thinking in Disaster Management Research}}}, year = {{2012}}, } @article{5638, author = {{Schryen, Guido}}, journal = {{Die Zeit}}, title = {{{Profis im Netz: Soziale Netzwerke könnten in Unternehmen viel mehr Nutzen stiften - woran hakt es?, in: Die Zeit (12.04.2012)}}}, year = {{2012}}, } @article{5639, author = {{Schryen, Guido}}, journal = {{IM Information Management & Consulting}}, publisher = {{Information Multimedia Communication imc}}, title = {{{Soziale Netzwerke in Unternehmenskontexten - Potentiale und Anforderungen, in: Information Management & Consulting, to appear}}}, year = {{2012}}, } @inproceedings{5684, author = {{Lang, Fabian and Schryen, Guido and Fink, Andreas}}, booktitle = {{Proceedings of the 2011 International Conference on Information Systems (ICIS 2011)}}, title = {{{Automated Negotiations Under Uncertain Preferences}}}, year = {{2011}}, } @inproceedings{5689, author = {{Bodenstein, Christian and Schryen, Guido and Neumann, Dirk}}, booktitle = {{Proceedings of the 19th European Conference on Information Systems (ECIS 2011)}}, title = {{{Reducing Datacenter Energy Usage through Efficient Job Allocation}}}, year = {{2011}}, } @inproceedings{5581, author = {{Wex, Felix and Schryen, Guido and Neumann, Dirk}}, booktitle = {{Proceedings of the 8th International Conference on Information Systems for Crisis Response and Management (ISCRAM 2011)}}, title = {{{Intelligent Decision Support for Centralized Coordination during Emergency Response}}}, year = {{2011}}, } @inproceedings{5619, author = {{Schryen, Guido and Volkamer, Melanie and Ries, Sebastian}}, booktitle = {{Proceedings of the 26th Annual ACM Symposium on Applied Computing}}, title = {{{A formal approach towards measuring trust in distributed systems}}}, year = {{2011}}, } @article{5640, author = {{Schryen, Guido}}, journal = {{Communications of the ACM (CACM)}}, number = {{No. 5}}, pages = {{130--139}}, publisher = {{Association for Computing Machinery}}, title = {{{Is open source security a myth? What do vulnerability and patch data say?}}}, volume = {{Vol. 54}}, year = {{2011}}, } @inproceedings{5641, author = {{Schryen, Guido}}, booktitle = {{IS Capabilities Change, and IS Innovation, Proceedings of the 19th European Conference on Information Systems (ECIS 2011), Helsinki}}, title = {{{Seeking the VALUE in IS Business Value Research - An Agenda for investigating Synergies Between Socio-organizational Change, IS Capabilities Change, and IS Innovation}}}, year = {{2011}}, } @inproceedings{5685, abstract = {{In double-sided markets for computing resources an optimal allocation schedule among job offers and requests subject to relevant capacity constraints can be determined. With increasing storage demands and emerging storage services the question how to schedule storage jobs becomes more and more interesting. Since such scheduling problems are often in the class NP-complete an exact computation is not feasible in practice. On the other hand an approximation to the optimal solution can easily be found by means of using heuristics. The problem with this attempt is that the suggested solution may not be exactly optimal and is thus less satisfying. Considering the two above mentioned solution approaches one can clearly find a trade-off between the optimality of the solution and the efficiency to get to a solution at all. This work proposes to apply and combine heuristics in optimization to gain from both of their benefits while reducing the problematic aspects. Following this method it is assumed to get closer to the optimal solution in a shorter time compared to a full optimization.}}, author = {{Finkbeiner, Josef and Bodenstein, Christian and Schryen, Guido and Neumann, Dirk}}, booktitle = {{18th European Conference on Information Systems (ECIS 2010)}}, keywords = {{Decision Support System, Algorithms, Optimization, Market Engineering}}, title = {{{Applying heuristic methods for job scheduling in storage markets}}}, year = {{2010}}, } @inproceedings{5690, abstract = {{In a world, where more and more businesses seem to trade in an online market, the supply of online services to supply the ever-growing demand could quickly reach its capacity limits. Online service providers may find themselves maxed out at peak operation levels during high-traffic timeslots but too little demand during low-traffic timeslots, although the latter is becoming less frequent. At this point not only deciding which user is allocated what level of service becomes essential, but also the magnitude of the service provided, can be controlled by pricing. Pricing is an important factor when efficient and acceptable allocation of resources between individuals must be reached. Without prices, transferring or sharing goods would be impossible. In sharing information, pricing a product however is not as simple as relatively pricing an apple or a pear. Often the costs, and hence the prices are simply unknown. Backed by this scenario, the online services market could be combined with the market design mechanism of diamonds. For this we propose an ultimatum pricing strategy which effectively allows for valuations to be accounted for, but no longer a necessity when pricing in grid, cloud or other online computing environments.}}, author = {{Bodenstein, Christian and Schryen, Guido and Neumann, Dirk}}, booktitle = {{18th European Conference on Information Systems (ECIS 2010)}}, keywords = {{Posted Price, Ultimatum Game, Energy Efficiency, Mechanism Design}}, title = {{{From "Take-it-or-leave-it" offers to "Take-it-or-be-left-out" Ultimatum - A trade mechanism for Online Services}}}, year = {{2010}}, } @inproceedings{5598, abstract = {{Emerging digital environments and infrastructures, such as distributed services and computing services, have generated new options of communication, information sharing, and resource utilization in past years. Different distributed trust concepts are applied to increase trust in such systems. However, these concepts yield to rather complex architectures which make it difficult to determine which component or system needs to be trusted. This paper presents a novel trust measurement method for distributed systems which enables the t identification of weak points in the overall system architecture. The measurement method includes the specification of a formal trust language and its representation by means of propositional logic formulas. The applicability of the proposed concepts is demonstrated by conducting a case study on the Internet voting system that was used in the 2007 parliamentary elections in Estonia.}}, author = {{Volkamer, Melanie and Schryen, Guido}}, booktitle = {{Proceedings of the 23rd Bled eConference}}, keywords = {{distributed trust concepts, measuring etrust, Internet voting}}, title = {{{Measuring eTrust in distributed systems - General Concept and Application to Internet Voting}}}, year = {{2010}}, } @inproceedings{5631, abstract = {{While many theoretical arguments against or in favor of open source and closed source software development have been presented, the empirical basis for the assessment of arguments and the development of models is still weak. Addressing this research gap, this paper presents the first comprehensive empirical investigation of published vulnerabilities and patches of 17 widely deployed open source and closed source software packages, including operating systems, database systems, web browsers, email clients, and office systems. The empirical analysis uses comprehensive vulnerability data contained in the NIST National Vulnerability Database and a newly compiled data set of vulnerability patches. The results suggest that it is not the particular software development style that determines the severity of vulnerabilities and vendors? patching behavior, but rather the specific application type and the policy of the particular development community, respectively.}}, author = {{Schryen, Guido and Eliot, Rich}}, booktitle = {{43rd Annual Hawaii International Conference on System Sciences}}, title = {{{Increasing software security through open source or closed source development? Empirics suggest that we have asked the wrong question}}}, year = {{2010}}, }