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 - TY - JOUR AU - Zheng, Guoxing AU - Mühlenbernd, Holger AU - Kenney, Mitchell AU - Li, Guixin AU - Zentgraf, Thomas AU - Zhang, Shuang ID - 1700 IS - 4 JF - Nature Nanotechnology SN - 1748-3387 TI - Metasurface holograms reaching 80% efficiency VL - 10 ER - TY - JOUR AU - Flasskamp, Kathrin AU - Hage-Packhäuser, Sebastian AU - Ober-Blöbaum, Sina ID - 17039 IS - 1 JF - Journal of Computational Dynamics TI - Symmetry exploiting control of hybrid mechanical systems VL - 2 ER - TY - JOUR AU - Campos, Cédric M. AU - Ober-Blöbaum, Sina AU - Trélat, Emmanuel ID - 17041 IS - 9 JF - Discrete & Continuous Dynamical Systems - A TI - High order variational integrators in the optimal control of mechanical systems VL - 35 ER - TY - CONF AU - Gorbacheva, Elena AU - Stein, Armin AU - Schmiedel, Theresa AU - Müller, Oliver ID - 17105 SN - 978-3-00-050284-2 T2 - European Conference on Information Systems TI - A gender perspective on business process management competences offered on professional online social networks ER - TY - JOUR AU - vom Brocke, Jan AU - Müller, Oliver AU - Debortoli, Stefan AU - Reuter, Nadine ID - 17108 IS - 2 JF - Controlling SN - 0935-0381 TI - Potenzialbeurteilung neuer Technologien im Prozesscontrolling VL - 26 ER - TY - GEN AU - Ahmed, Abdullah Fathi ID - 10615 TI - Self-Optimizing Organic Cache ER - TY - THES AB - The use of heterogeneous computing resources, such as graphics processing units or other specialized co-processors, has become widespread in recent years because of their performance and energy efficiency advantages. Operating system approaches that are limited to optimizing CPU usage are no longer sufficient for the efficient utilization of systems that comprise diverse resource types. Enabling task preemption on these architectures and migration of tasks between different resource types at run-time is not only key to improving the performance and energy consumption but also to enabling automatic scheduling methods for heterogeneous compute nodes. This thesis proposes novel techniques for run-time management of heterogeneous resources and enabling tasks to migrate between diverse hardware. It provides fundamental work towards future operating systems by discussing implications, limitations, and chances of the heterogeneity and introducing solutions for energy- and performance-efficient run-time systems. Scheduling methods to utilize heterogeneous systems by the use of a centralized scheduler are presented that show benefits over existing approaches in varying case studies. AU - Beisel, Tobias ID - 10624 SN - 978-3-8325-4155-2 TI - Management and Scheduling of Accelerators for Heterogeneous High-Performance Computing ER - TY - GEN AU - Hangmann, Hendrik ID - 10668 TI - Evolution of Heat Flow Prediction Models for FPGA Devices ER - TY - GEN AU - Haupt, Christian ID - 10671 TI - Computer Vision basierte Klassifikation von HD EMG Signalen ER - TY - CONF AU - Ho, Nam AU - Ahmed, Abdullah Fathi AU - Kaufmann, Paul AU - Platzner, Marco ID - 10673 KW - cache storage KW - field programmable gate arrays KW - multiprocessing systems KW - parallel architectures KW - reconfigurable architectures KW - FPGA KW - dynamic reconfiguration KW - evolvable cache mapping KW - many-core architecture KW - memory-to-cache address mapping function KW - microarchitectural optimization KW - multicore architecture KW - nature-inspired optimization KW - parallelization degrees KW - processor KW - reconfigurable cache mapping KW - reconfigurable computing KW - Field programmable gate arrays KW - Software KW - Tuning T2 - Proc. NASA/ESA Conf. Adaptive Hardware and Systems (AHS) TI - Microarchitectural optimization by means of reconfigurable and evolvable cache mappings ER - TY - CONF AU - Kaufmann, Paul AU - Shen, Cong ID - 10693 T2 - Genetic and Evolutionary Computation (GECCO) TI - Generator Start-up Sequences Optimization for Network Restoration Using Genetic Algorithm and Simulated Annealing ER - TY - CONF AU - Meisner, Sebastian AU - Platzner, Marco ID - 10711 T2 - Field Programmable Technology (FPT), 2015 International Conference on TI - Comparison of thread signatures for error detection in hybrid multi-cores ER - TY - GEN AU - Meißner, Roland ID - 10714 TI - Konzept und Implementation einer Benutzeroberfläche zur Generierung virtueller FPGAs ER - TY - GEN AU - Posewsky, Thorbjörn ID - 10726 TI - Acceleration of Artificial Neural Networks on a Zynq Platform ER - TY - BOOK AU - M. Mora, Antonio AU - Squillero, Giovanni AU - Agapitos, Alexandros AU - Burelli, Paolo AU - S. Bush, William AU - Cagnoni, Stefano AU - Cotta, Carlos AU - De Falco, Ivanoe AU - Della Cioppa, Antonio AU - Divina, Federico AU - Eiben, A.E. AU - I. Esparcia-Alc{\'a}zar, Anna AU - Fern{\'a}ndez de Vega, Francisco AU - Glette, Kyrre AU - Haasdijk, Evert AU - Ignacio Hidalgo, J. AU - Kampouridis, Michael AU - Kaufmann, Paul AU - Mavrovouniotis, Michalis AU - Thanh Nguyen, Trung AU - Schaefer, Robert AU - Sim, Kevin AU - Tarantino, Ernesto AU - Urquhart, Neil AU - Zhang (editors), Mengjie ID - 10757 TI - Applications of Evolutionary Computation - 18th European Conference, EvoApplications VL - 9028 ER - TY - CONF AU - H.W. Leong, Philip AU - Amano, Hideharu AU - Anderson, Jason AU - Bertels, Koen AU - M.P. Cardoso, Jo\~ao AU - Diessel, Oliver AU - Gogniat, Guy AU - Hutton, Mike AU - Lee, JunKyu AU - Luk, Wayne AU - Lysaght, Patrick AU - Platzner, Marco AU - K. Prasanna, Viktor AU - Rissa, Tero AU - Silvano, Cristina AU - So, Hayden AU - Wang, Yu ID - 10765 T2 - Proceedings of the 25th International Conference on Field Programmable Logic and Applications (FPL) TI - Significant papers from the first 25 years of the FPL conference ER - TY - CONF AU - Ghribi, Ines AU - Ben Abdallah, Riadh AU - Khalgui, Mohamed AU - Platzner, Marco ID - 10767 T2 - Proceedings of the 29th European Simulation and Modelling Conference (ESM) TI - New Codesign Solutions for Modelling and Partitioning of Probabilistic Reconfigurable Embedded Software ER - TY - JOUR AU - Ghasemzadeh Mohammadi, Hassan AU - Gaillardon, Pierre-Emmanuel AU - De Micheli, Giovanni ID - 10770 IS - 6 JF - IEEE Transactions on Nanotechnology TI - From Defect Analysis to Gate-Level Fault Modeling of Controllable-Polarity Silicon Nanowires VL - 14 ER - TY - CONF AU - Ghasemzadeh Mohammadi, Hassan AU - Gaillardon, Pierre-Emmanuel AU - Zhang, Jian AU - De Micheli, Giovanni AU - Sanchez, Eduardo AU - Reorda, Matteo Sonza ID - 10771 T2 - 2015 IEEE Computer Society Annual Symposium on VLSI TI - On the design of a fault tolerant ripple-carry adder with controllable-polarity transistors ER - TY - CONF AU - Ghasemzadeh Mohammadi, Hassan AU - Gaillardon, Pierre-Emmanuel AU - De Micheli, Giovanni ID - 10772 T2 - Proceedings of the 2015 Design, Automation & Test in Europe Conference \& Exhibition TI - Fault modeling in controllable polarity silicon nanowire circuits ER - TY - CONF AU - Guettatfi, Zakarya AU - Kermia, Omar AU - Khouas, Abdelhakim ID - 10779 KW - embedded systems KW - field programmable gate arrays KW - operating systems (computers) KW - scheduling KW - μC/OS-II KW - FPGAs KW - OS foundation KW - SafeRTOS KW - Xenomai KW - chip utilization ration KW - complex time constraints KW - embedded systems KW - hard real-time hardware task allocation KW - hard real-time hardware task scheduling KW - hardware-software real-time operating systems KW - partially reconfigurable field-programmable gate arrays KW - resource constraints KW - safety-critical RTOS KW - Field programmable gate arrays KW - Hardware KW - Job shop scheduling KW - Real-time systems KW - Shape KW - Software SN - 1946-147X T2 - 25th International Conference on Field Programmable Logic and Applications (FPL) TI - Over effective hard real-time hardware tasks scheduling and allocation ER - TY - CONF AB - Noise tracking is an important component of speech enhancement algorithms. Of the many noise trackers proposed, Minimum Statistics (MS) is a particularly popular one due to its simple parameterization and at the same time excellent performance. In this paper we propose to further reduce the number of MS parameters by giving an alternative derivation of an optimal smoothing constant. At the same time the noise tracking performance is improved as is demonstrated by experiments employing speech degraded by various noise types and at different SNR values. AU - Chinaev, Aleksej AU - Haeb-Umbach, Reinhold ID - 11739 KW - speech enhancement KW - noise tracking KW - optimal smoothing T2 - Interspeech 2015 TI - On Optimal Smoothing in Minimum Statistics Based Noise Tracking ER - TY - CONF AB - We present a semantic analysis technique for spoken input using Markov Logic Networks (MLNs). MLNs combine graphical models with first-order logic. They areparticularly suitable for providing inference in the presence of inconsistent and incomplete data, which are typical of an automatic speech recognizer's (ASR) output in the presence of degraded speech. The target application is a speech interface to a home automation system to be operated by people with speech impairments, where the ASR output is particularly noisy. In order to cater for dysarthric speech with non-canonical phoneme realizations, acoustic representations of the input speech are learned in an unsupervised fashion. While training data transcripts are not required for the acoustic model training, the MLN training requires supervision, however, at a rather loose and abstract level. Results on two databases, one of them for dysarthric speech, show that MLN-based semantic analysis clearly outperforms baseline approaches employing non-negative matrix factorization, multinomial naive Bayes models, or support vector machines. AU - Despotovic, Vladimir AU - Walter, Oliver AU - Haeb-Umbach, Reinhold ID - 11748 T2 - INTERSPEECH 2015 TI - Semantic Analysis of Spoken Input using Markov Logic Networks ER - TY - CONF AB - This contribution presents a Direction of Arrival (DoA) estimation algorithm based on the complex Watson distribution to incorporate both phase and level differences of captured micro- phone array signals. The derived algorithm is reviewed in the context of the Generalized State Coherence Transform (GSCT) on the one hand and a kernel density estimation method on the other hand. A thorough simulative evaluation yields insight into parameter selection and provides details on the performance for both directional and omni-directional microphones. A comparison to the well known Steered Response Power with Phase Transform (SRP-PHAT) algorithm and a state of the art DoA estimator which explicitly accounts for aliasing, shows in particular the advantages of presented algorithm if inter-sensor level differences are indicative of the DoA, as with directional microphones. AU - Drude, Lukas AU - Jacob, Florian AU - Haeb-Umbach, Reinhold ID - 11755 T2 - 23th European Signal Processing Conference (EUSIPCO 2015) TI - DOA-Estimation based on a Complex Watson Kernel Method ER - TY - CONF AU - Heymann, Jahn AU - Drude, Lukas AU - Chinaev, Aleksej AU - Haeb-Umbach, Reinhold ID - 11810 T2 - Automatic Speech Recognition and Understanding Workshop (ASRU 2015) TI - BLSTM supported GEV Beamformer Front-End for the 3RD CHiME Challenge ER - TY - CONF AB - The parametric Bayesian Feature Enhancement (BFE) and a datadriven Denoising Autoencoder (DA) both bring performance gains in severe single-channel speech recognition conditions. The first can be adjusted to different conditions by an appropriate parameter setting, while the latter needs to be trained on conditions similar to the ones expected at decoding time, making it vulnerable to a mismatch between training and test conditions. We use a DNN backend and study reverberant ASR under three types of mismatch conditions: different room reverberation times, different speaker to microphone distances and the difference between artificially reverberated data and the recordings in a reverberant environment. We show that for these mismatch conditions BFE can provide the targets for a DA. This unsupervised adaptation provides a performance gain over the direct use of BFE and even enables to compensate for the mismatch of real and simulated reverberant data. AU - Heymann, Jahn AU - Haeb-Umbach, Reinhold AU - Golik, P. AU - Schlueter, R. ID - 11813 KW - codecs KW - signal denoising KW - speech recognition KW - Bayesian feature enhancement KW - denoising autoencoder KW - reverberant ASR KW - single-channel speech recognition KW - speaker to microphone distances KW - unsupervised adaptation KW - Adaptation models KW - Noise reduction KW - Reverberation KW - Speech KW - Speech recognition KW - Training KW - deep neuronal networks KW - denoising autoencoder KW - feature enhancement KW - robust speech recognition T2 - Acoustics, Speech and Signal Processing (ICASSP), 2015 IEEE International Conference on TI - Unsupervised adaptation of a denoising autoencoder by Bayesian Feature Enhancement for reverberant asr under mismatch conditions ER - TY - JOUR AB - Joint audio-visual speaker tracking requires that the locations of microphones and cameras are known and that they are given in a common coordinate system. Sensor self-localization algorithms, however, are usually separately developed for either the acoustic or the visual modality and return their positions in a modality specific coordinate system, often with an unknown rotation, scaling and translation between the two. In this paper we propose two techniques to determine the positions of acoustic sensors in a common coordinate system, based on audio-visual correlates, i.e., events that are localized by both, microphones and cameras separately. The first approach maps the output of an acoustic self-calibration algorithm by estimating rotation, scale and translation to the visual coordinate system, while the second solves a joint system of equations with acoustic and visual directions of arrival as input. The evaluation of the two strategies reveals that joint calibration outperforms the mapping approach and achieves an overall calibration error of 0.20m even in reverberant environments. AU - Jacob, Florian AU - Haeb-Umbach, Reinhold ID - 11830 JF - ArXiv e-prints TI - Absolute Geometry Calibration of Distributed Microphone Arrays in an Audio-Visual Sensor Network ER - TY - BOOK AU - Li, Jinyu AU - Deng, Li AU - Haeb-Umbach, Reinhold AU - Gong, Y. ID - 11868 TI - Robust Automatic Speech Recognition ER - TY - CONF AB - Only a few studies exist on automatic emotion analysis of speech from children with Autism Spectrum Conditions (ASC). Out of these, some preliminary studies have recently focused on comparing the relevance of selected prosodic features against large sets of acoustic, spectral, and cepstral features; however, no study so far provided a comparison of performances across different languages. The present contribution aims to fill this white spot in the literature and provide insight by extensive evaluations carried out on three databases of prompted phrases collected in English, Swedish, and Hebrew, inducing nine emotion categories embedded in short-stories. The datasets contain speech of children with ASC and typically developing children under the same conditions. We evaluate automatic diagnosis and recognition of emotions in atypical childrens voice over the nine categories including binary valence/arousal discrimination. AU - Marchi, Erik AU - Schuller, Bjoern AU - Baron-Cohen, Simon AU - Golan, Ofer AU - Boelte, Sven AU - Arora, Prerna AU - Haeb-Umbach, Reinhold ID - 11875 T2 - INTERSPEECH 2015 TI - Typicality and Emotion in the Voice of Children with Autism Spectrum Condition: Evidence Across Three Languages ER - TY - CONF AB - In this paper we present a source counting algorithm to determine the number of speakers in a speech mixture. In our proposed method, we model the histogram of estimated directions of arrival with a nonparametric Bayesian infinite Gaussian mixture model. As an alternative to classical model selection criteria and to avoid specifying the maximum number of mixture components in advance, a Dirichlet process prior is employed over the mixture components. This allows to automatically determine the optimal number of mixture components that most probably model the observations. We demonstrate by experiments that this model outperforms a parametric approach using a finite Gaussian mixture model with a Dirichlet distribution prior over the mixture weights. AU - Walter, Oliver AU - Drude, Lukas AU - Haeb-Umbach, Reinhold ID - 11919 T2 - 40th International Conference on Acoustics, Speech and Signal Processing (ICASSP 2015) TI - Source Counting in Speech Mixtures by Nonparametric Bayesian Estimation of an infinite Gaussian Mixture Model ER - TY - JOUR AB - Besides the core learning algorithm itself, one major question in machine learning is how to best encode given training data such that the learning technology can efficiently learn based thereon and generalize to novel data. While classical approaches often rely on a hand coded data representation, the topic of autonomous representation or feature learning plays a major role in modern learning architectures. The goal of this contribution is to give an overview about different principles of autonomous feature learning, and to exemplify two principles based on two recent examples: autonomous metric learning for sequences, and autonomous learning of a deep representation for spoken language, respectively. AU - Walter, Oliver AU - Haeb-Umbach, Reinhold AU - Mokbel, Bassam AU - Paassen, Benjamin AU - Hammer, Barbara ID - 11922 JF - KI - Kuenstliche Intelligenz KW - Representation learning KW - Metric learning KW - Deep representation KW - Spoken language TI - Autonomous Learning of Representations ER - TY - GEN AB - In this paper we show that recently developed algorithms for unsupervised word segmentation can be a valuable tool for the documentation of endangered languages. We applied an unsupervised word segmentation algorithm based on a nested Pitman-Yor language model to two austronesian languages, Wooi and Waima'a. The algorithm was then modified and parameterized to cater the needs of linguists for high precision of lexical discovery: We obtained a lexicon precision of of 69.2\% and 67.5\% for Wooi and Waima'a, respectively, if single-letter words and words found less than three times were discarded. A comparison with an English word segmentation task showed comparable performance, verifying that the assumptions underlying the Pitman-Yor language model, the universality of Zipf's law and the power of n-gram structures, do also hold for languages as exotic as Wooi and Waima'a. AU - Walter, Oliver AU - Haeb-Umbach, Reinhold AU - Strunk, Jan AU - P. Himmelmann, Nikolaus ID - 11923 TI - Lexicon Discovery for Language Preservation using Unsupervised Word Segmentation with Pitman-Yor Language Models (FGNT-2015-01) ER - TY - CONF AU - Altintas, Onur AU - Dressler, Falko AU - Hagenauer, Florian AU - Matsumoto, Makiko AU - Sepulcre, Miguel AU - Sommer, Christoph ID - 11969 SN - 9781467371315 T2 - 2015 IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS) TI - Making cars a main ICT resource in smart cities ER - TY - JOUR AU - Bloessl, Bastian AU - Puschmann, Andre AU - Sommer, Christoph AU - Dressler, Falko ID - 11980 JF - ACM SIGMOBILE Mobile Computing and Communications Review SN - 1559-1662 TI - Timings Matter ER - TY - CONF AU - Bloessl, Bastian AU - Sommer, Christoph AU - Dressler, Falko ID - 11981 SN - 9781467371315 T2 - 2015 IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS) TI - Power matters: Automatic Gain Control for a Software Defined Radio IEEE 802.11a/g/p receiver ER - TY - CONF AU - Bloessl, Bastian AU - Sommer, Christoph AU - Dressier, Falko AU - Eckhoff, David ID - 11982 SN - 9781479969593 T2 - 2015 International Conference on Computing, Networking and Communications (ICNC) TI - The scrambler attack: A robust physical layer attack on location privacy in vehicular networks ER - TY - CHAP AU - Eckhoff, David AU - Sommer, Christoph ID - 12004 SN - 9781782422112 T2 - Vehicular Communications and Networks TI - Simulative performance evaluation of vehicular networks ER - TY - CONF AU - Hagenauer, Florian AU - Dressler, Falko AU - Sommer, Christoph ID - 12010 SN - 9781479976607 T2 - 2014 IEEE Vehicular Networking Conference (VNC) TI - Poster: A simulator for heterogeneous vehicular networks ER - TY - CONF AU - Joerer, Stefan AU - Bloessl, Bastian AU - Segata, Michele AU - Sommer, Christoph AU - Cigno, Renato Lo AU - Dressler, Falko ID - 12024 SN - 9781479949120 T2 - 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC) TI - Fairness kills safety: A comparative study for intersection assistance applications ER - TY - JOUR AU - Joerer, Stefan AU - Bloessl, Bastian AU - Segata, Michele AU - Sommer, Christoph AU - Cigno, Renato Lo AU - Jamalipour, Abbas AU - Dressler, Falko ID - 12026 JF - IEEE Transactions on Mobile Computing SN - 1536-1233 TI - Enabling Situation Awareness at Intersections for IVC Congestion Control Mechanisms ER - TY - JOUR AU - Klingler, Florian AU - Dressler, Falko AU - Cao, Jiannong AU - Sommer, Christoph ID - 12030 JF - Ad Hoc Networks SN - 1570-8705 TI - MCB – A multi-channel beaconing protocol ER - TY - CONF AU - Segata, Michele AU - Bloessl, Bastian AU - Joerer, Stefan AU - Sommer, Christoph AU - Gerla, Mario AU - Cigno, Renato AU - Dressler, Falko ID - 12047 SN - 9781479952700 T2 - 2014 7th International Workshop on Communication Technologies for Vehicles (Nets4Cars-Fall) TI - Towards inter-vehicle communication strategies for platooning support ER - TY - CONF AU - Segata, Michele AU - Joerer, Stefan AU - Bloessl, Bastian AU - Sommer, Christoph AU - Dressler, Falko AU - Cigno, Renate Lo ID - 12048 SN - 9781479976607 T2 - 2014 IEEE Vehicular Networking Conference (VNC) TI - Plexe: A platooning extension for Veins ER - TY - JOUR AU - Segata, Michele AU - Bloessl, Bastian AU - Joerer, Stefan AU - Sommer, Christoph AU - Gerla, Mario AU - Lo Cigno, Renato AU - Dressler, Falko ID - 12050 JF - IEEE Transactions on Vehicular Technology SN - 0018-9545 TI - Toward Communication Strategies for Platooning: Simulative and Experimental Evaluation ER - TY - JOUR AU - Sommer, Christoph AU - Joerer, Stefan AU - Segata, Michele AU - Tonguz, Ozan K. AU - Cigno, Renato Lo AU - Dressler, Falko ID - 12069 JF - IEEE Transactions on Mobile Computing SN - 1536-1233 TI - How Shadowing Hurts Vehicular Communications and How Dynamic Beaconing Can Help ER - TY - CHAP AU - Sommer, Christoph AU - Dressler, Falko ID - 12070 SN - 9781782422112 T2 - Vehicular Communications and Networks TI - Information dissemination in vehicular networks ER - TY - CHAP AU - Sommer, Christoph AU - Härri, Jérôme AU - Hrizi, Fatma AU - Schünemann, Björn AU - Dressler, Falko ID - 12071 SN - 9783319154961 T2 - Vehicular ad hoc Networks TI - Simulation Tools and Techniques for Vehicular Communications and Applications ER - TY - JOUR AU - Beutner, Marc AU - Eggert, Denise ID - 12927 JF - Kölner Zeitschrift für Wirtschaft und Pädagogik TI - Möglichkeiten der Audio-Unterstützung insbesondere mit Blick auf Podcasts in Lerneinheiten und E-Learning Kontexten – Ergebnisse, Eindrücke und Handlungsempfehlungen auf Basis des Projekts SEEL ER - TY - JOUR AU - Röwenstrunk, Daniel AU - Prätzlich, Thomas AU - Betzwieser, Thomas AU - Müller, Meinard AU - Szwillus, Gerd AU - Veit, Joachim ID - 12934 JF - Datenbank-Spektrum SN - 1618-2162 TI - Das Gesamtkunstwerk Oper aus Datensicht ER - TY - CONF AU - Kampmann, Matthias AU - A. Kochte, Michael AU - Schneider, Eric AU - Indlekofer, Thomas AU - Hellebrand, Sybille AU - Wunderlich, Hans-Joachim ID - 12976 T2 - 24th IEEE Asian Test Symposium (ATS'15) TI - Optimized Selection of Frequencies for Faster-Than-at-Speed Test ER -