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Workshops and Symposia on Models in Software engineering, MODELS 2011

作者： Mussbacher, Gunter Al Abed, Wisam Alam, Omar Ali, Shaukat Beugnard, Antoine Bonnet, Valentin Bræk, Rolv Capozucca, Alfredo Cheng, Betty H.C. Fatima, Urooj France, Robert Georg, Geri Guelfi, Nicolas Istoan, Paul Jézéquel, Jean-Marc Kienzle, Jörg Klein, Jacques Lézoray, Jean-Baptiste Malakuti, Somayeh Moreira, Ana Phung-Khac, An Troup, Lucy Department of Systems and Computer Engineering Carleton University Canada Software Engineering Laboratory McGill University Montreal Canada Simula Research Laboratory Norway Département Informatique TELECOM Bretagne France Department of Telematics Norwegian University of Science and Technology Norway LASSY Research Team University of Luxembourg Luxembourg Department of Computer Science and Engineering Michigan State University United States Computer Science Department Colorado State University Fort Collins United States ISC Department CRP Gabriel Lippmann Luxembourg INRIA Centre Rennes - Bretagne Atlantique Rennes France Laboratory for Advanced Software Systems University of Luxembourg Luxembourg Software Engineering Group University of Twente Netherlands Universidade Nova de Lisboa Lisbon Portugal Department of Psychology Colorado State University Fort Collins United States

ISBN: (纸本)9783642296444

While there are many aspect-oriented modeling (AOM) approaches, from requirements to low-level design, it is still difficult to compare them and know under which conditions different approaches are most applicable. This comparison, however, is crucially important to unify existing AOM and more traditional object-oriented modeling (OOM) approaches and to generalize individual approaches into a comprehensive end-to-end method. Such a method does not yet exist. This paper reports on work done at the inaugural Comparing Modeling Approaches (CMA) workshop towards the goal of identifying potential comprehensive methodologies: (i) a common, focused case study for six modeling approaches, (ii) a set of criteria applied to each of the six approaches, and (iii) the assessment results. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Artificial intelligence

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Robust non-negative matrix factorization for joint spectrum sensing and primary user localization in cognitive radio networks

Robust non-negative matrix factorization for joint spectrum ...

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International Waveform Diversity and Design Conference, WDD 2012

作者： Hu, Z. Ranganathan, Raghuram Zhang, Changchun Qiu, R.C. Bryant, Michael Wicks, M.C. Li, Lily Cognitive Radio Insitute Department of Electrical and Computer Engineering Center for Manufacturing Research Tennessee Technological University CookevilleTN38505 United States Air Force Research Laboratory Wright Paterson AFBOH45433 United States Sensor Systems Division University of Dayton Research Institute 300 College Park DaytonOH45469 United States Department of Computer Science Tennessee Technological University CookevilleTN38505 United States

ISBN: (纸本)9781509005987

In this paper, a novel approach based on non-negative matrix factorization is applied for joint spectrum sensing and primary user localization in cognitive radio networks. This approach is robust and tolerant to sparse, yet strong interference caused by malicious attack or false data injection. Simulation results clearly indicate that the proposed method is highly effective in yielding low localization error for various strengths and degrees of sparsity of interferer. It is also shown that the localization performance significantly increases with the number of cognitive radios deployed. © 2012 IEEE.

关键词： Non-negative matrix factorization

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A recursive local linear estimator for identification of nonlinear ARX systems

A recursive local linear estimator for identification of non...

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Universite Libre de Bruxelles

作者： Zhao, Wen-Xiao Zheng, Wei Xing Bai, Er-Wei Key Laboratory of Systems and Control Academy of Mathematics and Systems Science CAS Beijing China National Center for Mathematics and Interdisciplinary Sciences CAS Beijing China School of Computing Engineering and Mathematics University of Western Sydney Penrith NSW 2751 Australia Department of Electrical and Computer Engineering University of Iowa Iowa City IA 52242 United States

In this work, we propose a recursive local linear estimator (RLLE) for identification of nonlinear autoregressive systems with exogenous inputs, along with an analysis of its strong consistency and asymptotical mean s... 详细信息

ISBN: (纸本)9783902823069

关键词： Mean square error

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Radar chirp waveform selection and circuit optimization using ACPR load-pull measurements

Radar chirp waveform selection and circuit optimization usin...

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IEEE Annual Conference on Wireless and Microwave Technology (WAMICON)

作者： Josh Martin Matthew Moldovan Charles Baylis Robert J. Marks Lawrence Cohen Jean de Graaf Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX USA Radar Division U.S. Naval Research Laboratory Washington DC DC USA

Due to tightening spectral criteria, joint optimization of radar transmitter waveform and circuit is considered to minimize the nonlinearity and waveform induced spectral spreading of radar transmitters. This work demonstrates the ACPR load-pull measurement of a power amplifier under excitation from two chirp waveforms. The results are compared to allow selection of the optimum chirp and transmitter load impedance. This work represents a beginning effort toward the real-time, computationally intelligent transmitter optimization in future reconfigurable radar systems.

关键词： Chirp Radar Power amplifiers Optimization Power measurement Linearity Power generation

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New Materials-Theory-Based Model for Output Characteristics of AlGaN/GaN Heterostructure Field Effect Transistors

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MRS Online Proceedings Library 2012年第1期595卷 1-6页

作者： J. D. Albrecht P. P. Ruden M. G. Ancona Department of Electrical and Computer Engineering University of Minnesota Minneapolis USA Electronic Science and Technology Division U.S. Naval Research Laboratory Washington USA

A new model is used to examine the DC output characteristics of AlGaN/GaN heterostructure field effect transistors. The model is based on the charge-control/gradualchannel approximation and takes into account the non-linear current vs. voltage characteristics of the ungated AlGaN/GaN heterostructure channel regions. The model also includes thermal effects associated with device self-heating. For the power dissipation levels considered for many applications, the thermal degradation of the carrier drift velocity is shown to cause a negative output conductance in saturation. The temperature is incorporated self-consistently into the model through the field and temperature dependent mobility obtained from Monte Carlo transport simulations for electron transport in GaN. Calculated results presented for the DC output characteristics of several AlGaN/GaN field effect transistors show a strong dependence on the thermal properties of the substrate material. The substrate materials considered in this work are sapphire, SiC, AlN, and GaN.

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Dynamic shortest path algorithms for hypergraphs

Dynamic shortest path algorithms for hypergraphs

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2012 10th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks, WiOpt 2012

作者： Gao, Jianhang Zhao, Qing Ren, Wei Swami, Ananthram Ramanathan, Ram Bar-Noy, Amotz Department of Electrical and Computer Engineering University of California Davis CA United States Microsoft Corperation Redmond WA United States Army Research Laboratory Adelphi MD United States Raytheon BBN Technologies Cambridge MA United States Department of Computer Science City University of New York NY United States

ISBN: (纸本)9783901882456

A hypergraph is a set V of vertices and a set of non-empty subsets of V , called hyperedges. Unlike graphs, hypergraphs can capture higher-order interactions in social and communication networks that go beyond a simple union of pairwise relationships. In this paper, we consider the shortest path problem in hypergraphs. We develop two algorithms for finding and maintaining the shortest hyperpaths in a dynamic network with both weight and topological changes. These two algorithms are the first to address the fully dynamic shortest path problem in a general hypergraph. They complement each other by partitioning the application space based on the nature of the change dynamics and the type of the hypergraph. We analyze the time complexity of the proposed algorithms and perform simulation experiments for both random geometric hypergraphs and the Enron email data set. The latter illustrates the application of the proposed algorithms in social networks for identifying the most important actor based on the closeness centrality metric. © 2012 IFIP.

关键词： Graph theory

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Liquid‐Crystal Polymers: Topography from Topology: Photoinduced Surface Features Generated in Liquid Crystal Polymer Networks (Adv. Mater. 41/2013)

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Advanced Materials 2013年第41期25卷

作者： Michael E. McConney Angel Martinez Vincent P. Tondiglia Kyung Min Lee Derrick Langley Ivan I. Smalyukh Timothy J. White Air Force Research Laboratory Materials and Manufacturing Directorate 3005 Hobson Way WPAFB OH 45434 USA Department of Physics Liquid Crystal Materials Research Center Department of Electrical Computer and Energy Engineering and Materials Science Engineering Program University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA Air Force Institute of Technology Department of Electrical and Computer Engineering 2950 Hobson Way WPAFB OH 45433 USA

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A survey on routing protocols in Wireless Sensor Networks

A survey on routing protocols in Wireless Sensor Networks

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IEEE International Conference on Networks

作者： Mallanagouda Patil Rajashekhar C. Biradar Department of Computer Science and Engineering Wireless Information Systems Research Laboratory Reva Institute of Technology and Management Bangalore India

ISBN: (纸本)9781467345217

This paper presents a survey of state-of-the-art routing techniques in Wireless Sensor Networks (WSNs). Compared with traditional wireless networks, WSNs are characterized with denser levels of node deployment, higher unreliability of sensor nodes and severe power, computation and memory constraints. Various design challenges such as energy efficiency, data delivery models, quality of service, overheads etc., for routing protocols in WSNs are highlighted. We addressed most of the proposed routing methods along with scheme designs, benefits and result analysis wherever possible. The routing protocols discussed are classified into seven categories such as Data centric routing, Hierarchical routing, Location based routing, Negotiation based routing, Multipath based routing, Quality of Service (QoS) routing and Mobility based routing. This paper also compares the routing protocols against parameters such as power consumption, scalability, mobility, optimal routing and data aggregation. The paper concludes with possible open research issues in WSNs.

关键词： Routing Wireless sensor networks Routing protocols Quality of service Energy consumption Mobile communication

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Auditory detection of infrapitch signals for several spatial configurations of pink noise maskers

Auditory detection of infrapitch signals for several spatial...

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41st International Congress and Exposition on Noise Control engineering 2012, INTER-NOISE 2012

作者： Wakefield, Gregory H. Roginska, Agnieszka Santoro, Thomas Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 United States New York University New York NY 10012 United States Naval Submarine Medical Research Laboratory Groton CT 06349 United States

ISBN: (纸本)9781627485609

Listening for engine sounds in an underwater environment is modeled using spatialized infrapitch signals and pink noise maskers. Detection thresholds for such signals were measured for various spatial configurations of maskers. All stimuli were delivered over headphones, and rendered using individually measured Head-Related Transfer Functions. In single-masker environments, no significant effect of signal bearing in azimuth or elevation on detection threshold was observed. In multi-masker environments, the largest detection threshold increase was observed when increasing the number of maskers from 1 to 2. Thereafter, a linear increase in threshold detection (in dB) for every doubling of maskers, up to 32 maskers was observed. Randomizing the spatial presentation of the signal and maskers for each trial did not affect thresholds. Results suggest that prior knowledge of the spatial configuration of the signal and maskers does not appear to be necessary in performing such detection tasks.

关键词： Signal detection

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Online map-matching based on Hidden Markov model for real-time traffic sensing applications

Online map-matching based on Hidden Markov model for real-ti...

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International IEEE Conference on Intelligent Transportation systems

作者： C. Y. Goh J. Dauwels N. Mitrovic M. T. Asif A. Oran P. Jaillet School of Electrical and Electronic Engineering Nanyang Technological University Center for Future Urban Mobility Singapore-MIT Alliance for Research and Technology (SMART) Laboratory for Information and Decision Systems Department of Electrical Engineering and Computer Science and Operations Research Center MIT

ISBN: (纸本)9781467330640

In many Intelligent Transportation System (ITS) applications that crowd-source data from probe vehicles, a crucial step is to accurately map the GPS trajectories to the road network in real time. This process, known as map-matching, often needs to account for noise and sparseness of the data because (1) highly precise GPS traces are rarely available, and (2) dense trajectories are costly for live transmission and storage. We propose an online map-matching algorithm based on the Hidden Markov Model (HMM) that is robust to noise and sparseness. We focused on two improvements over existing HMM-based algorithms: (1) the use of an optimal localizing strategy, the variable sliding window (VSW) method, that guarantees the online solution quality under uncertain future inputs, and (2) the novel combination of spatial, temporal and topological information using machine learning. We evaluated the accuracy of our algorithm using field test data collected on bus routes covering urban and rural areas. Furthermore, we also investigated the relationships between accuracy and output delays in processing live input streams. In our tests on field test data, VSW outperformed the traditional localizing method in terms of both accuracy and output delay. Our results suggest that it is viable for low-latency applications such as traffic sensing.

关键词： Hidden Markov models Intelligent transportation systems bus routes Probe vehicles real-time traffic road network field experimentation Noise

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