TY - GEN AU - Maaz, Mohammad Urf AU - Sprenger, Alexander AU - Hellebrand, Sybille ID - 8112 KW - WORKSHOP TI - A Hybrid Space Compactor for Varying X-Rates ER - TY - JOUR AB - The ongoing softwarization of networks creates a big need for automated testing solutions to ensure service quality. This becomes even more important if agile environments with short time to market and high demands, in terms of service performance and availability, are considered. In this paper, we introduce a novel testing solution for virtualized, microservice-based network functions and services, which we base on TTCN-3, a well known testing language defined by the European standards institute (ETSI). We use TTCN-3 not only for functional testing but also answer the question whether TTCN-3 can be used for performance profiling tasks as well. Finally, we demonstrate the proposed concepts and solutions in a case study using our open-source prototype to test and profile a chained network service. AU - Peuster, Manuel AU - Dröge, Christian AU - Boos, Clemens AU - Karl, Holger ID - 8113 JF - ICT Express SN - 2405-9595 TI - Joint testing and profiling of microservice-based network services using TTCN-3 ER - TY - CONF AU - Dräxler, Sevil AU - Karl, Holger ID - 8240 T2 - 5th IEEE International Conference on Network Softwarization (NetSoft) 2019 TI - SPRING: Scaling, Placement, and Routing of Heterogeneous Services with Flexible Structures ER - TY - GEN AU - Bäumer, Frederik Simon AU - Geierhos, Michaela ID - 8312 KW - OTF Computing KW - Natural Language Processing KW - Requirements Engineering T2 - encyclopedia.pub TI - Requirements Engineering in OTF-Computing ER - TY - JOUR AB - In disaster operations management, a challenging task for rescue organizations occurs when they have to assign and schedule their rescue units to emerging incidents under time pressure in order to reduce the overall resulting harm. Of particular importance in practical scenarios is the need to consider collaboration of rescue units. This task has hardly been addressed in the literature. We contribute to both modeling and solving this problem by (1) conceptualizing the situation as a type of scheduling problem, (2) modeling it as a binary linear minimization problem, (3) suggesting a branch-and-price algorithm, which can serve as both an exact and heuristic solution procedure, and (4) conducting computational experiments - including a sensitivity analysis of the effects of exogenous model parameters on execution times and objective value improvements over a heuristic suggested in the literature - for different practical disaster scenarios. The results of our computational experiments show that most problem instances of practically feasible size can be solved to optimality within ten minutes. Furthermore, even when our algorithm is terminated once the first feasible solution has been found, this solution is in almost all cases competitive to the optimal solution and substantially better than the solution obtained by the best known algorithm from the literature. This performance of our branch-and-price algorithm enables rescue organizations to apply our procedure in practice, even when the time for decision making is limited to a few minutes. By addressing a very general type of scheduling problem, our approach applies to various scheduling situations. AU - Rauchecker, Gerhard AU - Schryen, Guido ID - 5674 IS - 1 JF - European Journal of Operational Research KW - OR in disaster relief KW - disaster operations management KW - scheduling KW - branch-and-price TI - An Exact Branch-and-Price Algorithm for Scheduling Rescue Units during Disaster Response VL - 272 ER - TY - CONF AU - Wolf, Verena AU - Bartelheimer, Christian AU - Beverungen, Daniel ID - 4517 T2 - Proceedings of the 52nd Hawaii International Conference on System Sciences (HICSS-52) TI - Digitalization of Work Systems—An Organizational Routines’ Perspective ER - TY - JOUR AB - We exploit a unique sample of structured financial products (SFPs) to analyze pricing and issuance dependencies among different types of such market‐linked investment vehicles. Our study provides evidence of cross‐pricing between products with complementary payoff profiles. Such dependencies may be explained by issuers’ efforts to generate order flow for products that supplement their current SFP risk exposure. Additionally, we observe issuance patterns in line with the argument that issuers exploit the complementarity payout profiles when bringing SFPs to market. Our study emphasizes cross‐pricing from a perspective not previously considered in the literature. AU - Pelster, Matthias AU - Schertler, Andrea ID - 4561 IS - 3 JF - Journal of Futures Markets KW - cross‐pricing KW - discount certificate KW - hedging KW - issuance decisions KW - put warrants KW - structured financial products TI - Pricing and issuance dependencies in SFP portfolios VL - 39 ER - TY - JOUR AU - Schmiedel, T. AU - Müller, Oliver AU - vom Brocke, J. ID - 4682 JF - Organizational Research Methods KW - online reviews KW - organizational culture KW - structural topic model KW - topic modeling KW - tutorial TI - Topic Modeling as a Strategy of Inquiry in Organizational Research: A Tutorial With an Application Example on Organizational Culture ER - TY - JOUR AU - Beverungen, Daniel AU - Müller, Oliver AU - Matzner, Martin AU - Mendling, Jan AU - vom Brocke, Jan ID - 4684 JF - Electronic Markets KW - Boundary object KW - Internet of things KW - Service science KW - Smart products KW - Smart service SN - 14228890 TI - Conceptualizing smart service systems ER - TY - CHAP AU - Harteis, Christian ED - Bahl, Anke ED - Dietzen, Anke ID - 4798 T2 - Work-based learning as a pathway to competence-based education TI - Supporting learning at work in an era of digitalization of work ER -