TY - CONF AU - Yasasin, Emrah AU - Schryen, Guido ID - 5541 T2 - 23rd European Conference on Information Systems (ECIS 2015) TI - Requirements for IT Security Metrics - An Argumentation Theory Based Approach ER - TY - CONF AB - 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. AU - Weishäupl, Eva AU - Yasasin, Emrah AU - Schryen, Guido ID - 5588 KW - Information Security KW - Investment KW - Literature review KW - Resource-based View KW - Organi-zational Learning Theory KW - Multi-theoretical Perspective T2 - International Conference on Information Systems TI - A Multi-Theoretical Literature Review on Information Security Investments using the Resource-Based View and the Organizational Learning Theory ER - TY - CONF AU - Weishäupl, Eva AU - Yasasin, Emrah AU - Schryen, Guido ID - 5589 T2 - 23rd European Conference on Information Systems (ECIS 2015) TI - IT Security Investments Through the Lens of the Resource-Based View: A new Theoretical Model and Literature Review ER - TY - CONF AB - 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. AU - Weishäupl, Eva AU - Kunz, Michael AU - Yasasin, Emrah AU - Wagner, Gerit AU - Prester, Julian AU - Schryen, Guido AU - Pernul, Günther ID - 5590 KW - Identity and Access Management KW - Economic Decision Making KW - Information Systems KW - Information Security Investment KW - Decision Theory T2 - 2nd International Workshop on Security in highly connected IT Systems (SHCIS?15) TI - Towards an Economic Approach to Identity and Access Management Systems Using Decision Theory ER - TY - JOUR AU - Schryen, Guido AU - Weishäupl, Eva ID - 5616 IS - 2 JF - Managementkompass TI - IT-Sicherheit: Ökonomisch Planen und Bewerten ER - TY - CONF AB - 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. AU - Schryen, Guido AU - Wagner, Gerit AU - Benlian, Alexander ID - 5618 KW - Literature review KW - Research methods/methodology KW - Theory of knowledge T2 - International Conference on Information Systems (ICIS) TI - Theory of Knowledge for Literature Reviews: An Epistemological Model, Taxonomy and Empirical Analysis of IS Literature ER - TY - JOUR AU - Schryen, Guido AU - Rauchecker, Gerhard AU - Comes, Martina ID - 5622 IS - 4 JF - Business & Information Systems Engineering (BISE) TI - Resource Planning in Disaster Response - Decision Support Models and Methodologies VL - 57 ER - TY - JOUR AU - Schryen, Guido ID - 5634 IS - Art 12 JF - Communications of the AIS TI - Writing qualitative IS literature reviews ? Guidelines for synthesis, interpretation and guidance of research VL - 37 ER - TY - CHAP AU - Frehe, Petra AU - Kremer, H.-Hugo ED - Gessler, M. ED - Freund, L. ID - 6503 T2 - Crossing Boundaries in Vocational Education and Training: Innovative Concepts for the 21st Century. Conference Proceedings. TI - Discovering (Hidden) Pathways within the Framework of Design Based Research (DBR) - Developing and "Arena of Innovation" in VET Contexts ER - TY - JOUR AB - We investigate the response of a polariton laser driven slightly off-resonantly using light fields differing from the routinely studied coherent pump sources. The response to driving light fields with thermal and displaced thermal statistics with varying correlation times shows significant differences in the transmitted intensity, its noise, and the position of the nonlinear threshold. We predict that adding more photons on average may actually reduce the transmission through the polariton system. AU - Assmann, Marc AU - Bayer, Manfred ID - 6520 IS - 5 JF - PHYSICAL REVIEW A SN - 1050-2947 TI - Stochastic pumping of a polariton fluid VL - 91 ER - TY - JOUR AB - An electric field applied to a semiconductor reduces its crystal symmetry and modifies its electronic structure which is expected to result in changes of the linear and nonlinear response to optical excitation. In GaAs, we observe experimentally strong electric field effects on the optical second (SHG) and third (THG) harmonic generation. The SHG signal for the laser-light k vector parallel to the [001] crystal axis is symmetry forbidden in the electric-dipole approximation, but can be induced by an applied electric field in the vicinity of the 1s exciton energy. Surprisingly, the THG signal, which is allowed in this geometry, is considerably reduced by the electric field. We develop a theory which provides good agreement with the experimental data. In particular, it shows that the optical nonlinearities for the 1s exciton resonance are modified in an electric field by the Stark effect, which mixes the 1s and 2p exciton states of opposite parity. This mixing acts in opposite way on the SHG and THG processes, as it leads to the appearance of forbidden SHG in (001)-oriented GaAs and decreases the crystallographic THG. AU - Brunne, D. AU - Lafrentz, M. AU - Pavlov, V. V. AU - Pisarev, R. V. AU - Rodina, A. V. AU - Yakovlev, D. R. AU - Bayer, M. ID - 6522 IS - 8 JF - Physical Review B SN - 1098-0121 TI - Electric field effect on optical harmonic generation at the exciton resonances in GaAs VL - 92 ER - TY - JOUR AB - We use a picosecond acoustics technique to modulate the laser output of electrically pumped GaAs/AlAs micropillar lasers with InGaAs quantum dots. The modulation of the emission wavelength takes place on the frequencies of the nanomechanical extensional and breathing (radial) modes of the micropillars. The amplitude of the modulation for various nanomechanical modes is different for every micropillar which is explained by a various elastic contact between the micropillar walls and polymer environment. AU - Czerniuk, T. AU - Tepper, J. AU - Akimov, A. V. AU - Unsleber, S. AU - Schneider, C. AU - Kamp, M. AU - Höfling, S. AU - Yakovlev, D. R. AU - Bayer, M. ID - 6524 IS - 4 JF - Applied Physics Letters SN - 0003-6951 TI - Impact of nanomechanical resonances on lasing from electrically pumped quantum dot micropillars VL - 106 ER - TY - JOUR AB - We introduce photon-statistics excitation spectroscopy and exemplarily apply it to a quantum-dot micropillar laser. Both the intensity and the photon number statistics of the emission from the micropillar show a strong dependence on the photon statistics of the light used for excitation of the sample. The results under coherent and pseudothermal excitation reveal that a description of the laser properties in terms of mean input photon numbers is not sufficient. It is demonstrated that the micropillar acts as a superthermal light source when operated close to its threshold. Possible applications for important spectroscopic techniques are discussed. AU - Kazimierczuk, T. AU - Schmutzler, J. AU - Aßmann, M. AU - Schneider, C. AU - Kamp, M. AU - Höfling, S. AU - Bayer, M. ID - 6526 IS - 2 JF - Physical Review Letters SN - 0031-9007 TI - Photon-Statistics Excitation Spectroscopy of a Quantum-Dot Micropillar Laser VL - 115 ER - TY - CONF AU - Yakovlev, D. R. AU - Warkentin, W. AU - Brunne, D. AU - Mund, J. AU - Pavlov, V. V. AU - Rodina, A. V. AU - Pisarev, R. V. AU - Bayer, M. ED - Bertolotti, Mario ED - Haus, Joseph W. ED - Zheltikov, Alexei M. ID - 6529 T2 - Nonlinear Optics and Applications IX TI - Novel mechanisms of optical harmonic generation on excitons in semiconductors ER - TY - CONF AU - Claes, Leander AU - Bause, Fabian AU - Rautenberg, Jens AU - Henning, Bernd ID - 6554 KW - piezoceramics KW - strip transducers KW - plate waveguide KW - dispersion diagram T2 - Proceedings SENSOR 2015 TI - Detection of ultrasonic plate waves using ceramic strip transducers ER - TY - JOUR AU - Scheer, David AU - Scholz, Markus AU - Rank, Astrid AU - Donie, Christian ID - 6612 IS - 3 JF - Journal of Cognitive Education and Psychology TI - Inclusive Beliefs and Self-Efficacy Concerning Inclusive Education Among German Teacher Trainees and Student Teachers VL - 14 ER - TY - JOUR AU - Scheer, David AU - Scholz, Markus AU - Rank, Astrid AU - Donie, Christian ID - 6613 IS - 8 JF - Zeitschrift für Heilpädagogik TI - „Alle außer Aaron...“ – Fallbezogene Selbstwirksamkeitserwartungen, Einstellungen und Überzeugungen zukünftiger Lehrkräfte im Kontext Inklusion VL - 66 ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6656 T2 - Proceedings of the 95th AMS Annual Meeting TI - Measurement and Analysis of offshore fog occurrences ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Bermpohl, Wolfgang ID - 6657 T2 - Wissenschaftliche Verhandlungen 2015 der Deutschen Physikalischen Gesellschaft TI - Messtechnisches Prinzip eines neuen Einstrahlungsmessgerätes ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6658 T2 - Proceedings of the DEWEK 2015 TI - Performance of MERRA Data in Offshore Wind Energy Applications ER - TY - CONF AU - Bendfeld, Jörg AU - Bouyraaman, Yassin AU - Balluff, Stefan AU - Krauter, Stefan ID - 6659 T2 - Proceedings of the DEWEK 2015 TI - Advanced Integration of Offshore Wind Energy into the Grid System by Power to Gas ER - TY - CONF AU - Sadati, A.M. AU - Krauter, Stefan AU - Bendfeld, Jörg ID - 6661 SN - 9781467371711 T2 - 2015 5th International Youth Conference on Energy (IYCE) TI - Comparison of micro inverters based on practical analysis ER - TY - CONF AU - Krauter, Stefan ID - 6662 SN - 9781479979448 T2 - 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) TI - Effective large-scale PV integration: Methods to match load profile with actual PV output ER - TY - CONF AU - Pendieu Kwaye, M. AU - Bendfeld, Jörg AU - Anglani, N. ID - 6663 SN - 9781467371711 T2 - 2015 5th International Youth Conference on Energy (IYCE) TI - Assessment of renewable energy resources in cameroon and special regards on energy supply ER - TY - CONF AU - Pendieu Kwaye, M. AU - Bendfeld, Jörg AU - Anglani, N. ID - 6664 SN - 9781467371711 T2 - 2015 5th International Youth Conference on Energy (IYCE) TI - Assessment of renewable energy resources and the use of hydro power for fluctuation compensation in Cameroon ER - TY - CONF AU - Krauter, Stefan AU - Bendfeld, Jörg ID - 6665 SN - 9781479979448 T2 - 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) TI - Cost, performance, and yield comparison of eight different micro-inverters ER - TY - CONF AU - Krauter, Stefan ID - 6666 SN - 9781479979448 T2 - 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) TI - BOS cost reduction via direct PV charging of electrical vehicles ER - TY - CONF AU - Bendfeld, Jörg AU - Bouyraaman, Yassin AU - Balluff, Stefan AU - Krauter, Stefan ID - 6667 T2 - Proceedings of the Karlsruhe Institute of Technology (KIT) - Energy Science Technology 2015 TI - Stabilizing offshore wind farm power feed-in via power to gas storage systems ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6668 T2 - Proceedings of the Karlsruhe Institute of Technology (KIT) - Energy Science Technology 2015 TI - Discovering the potential for offshore windfarms trough measurements ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6669 T2 - Proceedings of the 10th Conference on Sustainable Development of Energy, Water and Enviroment Systems - SDEWES TI - Wind power forecasting for offshore wind farms ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6670 T2 - Proceedings of the 10th Conference on Sustainable Development of Energy, Water and Enviroment Systems - SDEWES TI - Offshore wind energy development based on Merra data ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6671 T2 - Proceedings of the 10th Conference on Sustainable Development of Energy, Water and Enviroment Systems - SDEWES TI - Offshore metocean station for energy purposes ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6672 T2 - EWEA Forecasting 2015 Technology Workshop TI - Short term wind and energy prediction for offshore wind farms using neural networks ER - TY - CONF AU - Czerwinski, Wojciech AU - Martens, Wim AU - van Rooijen, Lorijn AU - Zeitoun, Marc ID - 6726 T2 - Fundamentals of Computation Theory - 20th International Symposium, (FCT) 2015, Gdańsk, Poland, August 17-19, 2015, Proceedings TI - A Note on Decidable Separability by Piecewise Testable Languages ER - TY - JOUR AU - Tönnies, Merle ID - 6769 JF - Dramatic Minds. Performance, Cognition, and the Representation of Interiority TI - Between Authenticity and Objectification: Narrating the Self in Contemporary British Drama ER - TY - GEN AU - Stilow, Georg ID - 694 TI - Mobile Agenten in Netzwerken: Analyse von Hotspots ER - TY - CHAP AU - Bouyraaman, Yassin AU - Bendfeld, Jörg AU - Breymann, Philipp AU - Krauter, Stefan ID - 6952 SN - 9783319177762 T2 - Renewable Energy in the Service of Mankind Vol I TI - Integration of Wind Energy in Power System—Modelling of a Market Oriented Energy Concept ER - TY - BOOK ED - Kremer, H.-Hugo ED - Beutner, Marc ID - 6978 TI - Individuelle Kompetenzentwicklungswege: Bildungsarbeit in einer dualisierten Ausbildungsvorbereitung. Ergebnisse und Reflexionen aus dem Forschungs- und Entwicklungsprojekt InBig ER - TY - GEN AB - We consider the following variant of the two dimensional gathering problem for swarms of robots: Given a swarm of $n$ indistinguishable, point shaped robots on a two dimensional grid. Initially, the robots form a closed chain on the grid and must keep this connectivity during the whole process of their gathering. Connectivity means, that neighboring robots of the chain need to be positioned at the same or neighboring points of the grid. In our model, gathering means to keep shortening the chain until the robots are located inside a $2\times 2$ subgrid. Our model is completely local (no global control, no global coordinates, no compass, no global communication or vision, \ldots). Each robot can only see its next constant number of left and right neighbors on the chain. This fixed constant is called the \emph{viewing path length}. All its operations and detections are restricted to this constant number of robots. Other robots, even if located at neighboring or the same grid point cannot be detected. Only based on the relative positions of its detectable chain neighbors, a robot can decide to obtain a certain state. Based on this state and their local knowledge, the robots do local modifications to the chain by moving to neighboring grid points without breaking the chain. These modifications are performed without the knowledge whether they lead to a global progress or not. We assume the fully synchronous $\mathcal{FSYNC}$ model. For this problem, we present a gathering algorithm which needs linear time. This result generalizes the result from \cite{hopper}, where an open chain with specified distinguishable (and fixed) endpoints is considered. AU - Abshoff, Sebastian AU - Cord-Landwehr, Andreas AU - Fischer, Matthias AU - Jung, Daniel AU - Meyer auf der Heide, Friedhelm ID - 16449 T2 - arXiv:1510.05454 TI - Gathering a Closed Chain of Robots on a Grid ER - TY - GEN AB - We consider the problem of dominating set-based virtual backbone used for routing in asymmetric wireless ad-hoc networks. These networks have non-uniform transmission ranges and are modeled using the well-established disk graphs. The corresponding graph theoretic problem seeks a strongly connected dominating-absorbent set of minimum cardinality in a digraph. A subset of nodes in a digraph is a strongly connected dominating-absorbent set if the subgraph induced by these nodes is strongly connected and each node in the graph is either in the set or has both an in-neighbor and an out-neighbor in it. Distributed algorithms for this problem are of practical significance due to the dynamic nature of ad-hoc networks. We present a first distributed approximation algorithm, with a constant approximation factor and O(Diam) running time, where Diam is the diameter of the graph. Moreover we present a simple heuristic algorithm and conduct an extensive simulation study showing that our heuristic outperforms previously known approaches for the problem. AU - Abu-Khzam, Faisal N. AU - Markarian, Christine AU - Meyer auf der Heide, Friedhelm AU - Schubert, Michael ID - 16452 T2 - arXiv:1510.01866 TI - Approximation and Heuristic Algorithms for Computing Backbones in Asymmetric Ad-Hoc Networks ER - TY - CONF AB - Consider n nodes connected to a single coordinator. Each node receives an individual online data stream of numbers and, at any point in time, the coordinator has to know the k nodes currently observing the largest values, for a given k between 1 and n. We design and analyze an algorithm that solves this problem while bounding the amount of messages exchanged between the nodes and the coordinator. Our algorithm employs the idea of using filters which, intuitively speaking, leads to few messages to be sent, if the new input is "similar" to the previous ones. The algorithm uses a number of messages that is on expectation by a factor of O((log {\Delta} + k) log n) larger than that of an offline algorithm that sets filters in an optimal way, where {\Delta} is upper bounded by the largest value observed by any node. AU - Mäcker, Alexander AU - Malatyali, Manuel AU - Meyer auf der Heide, Friedhelm ID - 16460 T2 - Proceedings of the 29th International Parallel and Distributed Processing Symposium (IPDPS) TI - Online Top-k-Position Monitoring of Distributed Data Streams ER - TY - JOUR AU - Demoures, F. AU - Gay-Balmaz, F. AU - Leyendecker, S. AU - Ober-Blöbaum, S. AU - Ratiu, T. S. AU - Weinand, Y. ID - 16582 JF - Numerische Mathematik SN - 0029-599X TI - Discrete variational Lie group formulation of geometrically exact beam dynamics ER - TY - CONF AU - Keuck, L. AU - Frohleke, N. AU - Bocker, J. AU - Ziessler, A. ID - 16622 SN - 9789075815221 T2 - 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe) TI - PFC-control for improved inductor utilization ER - TY - JOUR AU - Ober-Blöbaum, Sina AU - Padberg-Gehle, Kathrin ID - 16642 JF - PAMM SN - 1617-7061 TI - Multiobjective optimal control of fluid mixing ER - TY - JOUR AU - Ringkamp, Maik AU - Ober-Blöbaum, Sina AU - Leyendecker, Sigrid ID - 16660 JF - PAMM SN - 1617-7061 TI - Relaxing mixed integer optimal control problems using a time transformation ER - TY - JOUR AU - Krimphove, Dieter ID - 1682 IS - 15 JF - Zeitschrift für das gesamte Kreditwesen (ZfgK) TI - MIFID II Wertpapierhandel und -beratung in Veränderung ER - TY - JOUR AU - Bader, Christina A. AU - Zeuner, Franziska AU - Bader, Manuel H. W. AU - Zentgraf, Thomas AU - Meier, Cedrik ID - 1696 IS - 21 JF - Journal of Applied Physics SN - 0021-8979 TI - Nonlinear optical sub-bandgap excitation of ZnO-based photonic resonators VL - 118 ER - TY - JOUR AU - Zeuner, Franziska AU - Muldarisnur, Mulda AU - Hildebrandt, Andre AU - Förstner, Jens AU - Zentgraf, Thomas ID - 1697 IS - 6 JF - Nano Letters KW - tet_topic_plasmonics SN - 1530-6984 TI - Coupling Mediated Coherent Control of Localized Surface Plasmon Polaritons VL - 15 ER - TY - JOUR AU - Huang, Lingling AU - Mühlenbernd, Holger AU - Li, Xiaowei AU - Song, Xu AU - Bai, Benfeng AU - Wang, Yongtian AU - Zentgraf, Thomas ID - 1698 IS - 41 JF - Advanced Materials SN - 0935-9648 TI - Broadband Hybrid Holographic Multiplexing with Geometric Metasurfaces VL - 27 ER - TY - JOUR AU - Li, Guixin AU - Chen, Shumei AU - Pholchai, Nitipat AU - Reineke, Bernhard AU - Wong, Polis Wing Han AU - Pun, Edwin Yue Bun AU - Cheah, Kok Wai AU - Zentgraf, Thomas AU - Zhang, Shuang ID - 1699 IS - 6 JF - Nature Materials SN - 1476-1122 TI - Continuous control of the nonlinearity phase for harmonic generations VL - 14 ER -