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22nd Annual International Symposium of the International Council on systems engineering, INCOSE 2012 and the 8th Biennial European systems engineering Conference 2012, EuSEC 2012

作者： Mastrofmi, Manuel Cantone, Giovanni Seaman, Carolyn Shull, Forrest Diep, Madeline Falessi, Davide University of Rome Tor Vergata Department of Computer Science and Systems and Production Via del Politecnico 1 00133 Rome Italy Fraunhofer Center for Experimental Software Engineering University of Maryland Baltimore County Department of Information Systems ITE. Building. 1000 Hilltop Circle Baltimore MD 21250 United States Fraunhofer Center for Experimental Software Engineering 5825 University Research Court Suite 1300 College Park MD 20740-3823 United States Simula Research Laboratory Oslo Norway University of Rome Tor Vergata Department of Computer Science Systems and Production Via del Politecnico 1 00133 Rome Italy

ISBN: (纸本)9781622769162

When planning or controlling the system development process, a project leader needs to make decisions which take into account a number of aspects, including: availability of assets and competences, previously enacted processes in the organization, certifications the system is required to obtain, standards to comply with, interactions among process activities, contextual factors and constraints, and allocated budget and schedule. In this paper we propose a value-based approach for supporting decision making. The aim is to provide supportive information for decisions related to the system verification process. This would in turn enhance the performance of system development process by supporting the decision making process for complex systems. We report both academic and industrial empirical evaluations, which demonstrate the feasibility and effectiveness of our proposal, and thus prompt us to refine and extend our approach to sub-processes other than verification. ©2012 by the authors.

关键词： Decision making

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Inter-carrier interference self-cancellation for CI/MC-CDMA system

Inter-carrier interference self-cancellation for CI/MC-CDMA ...

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International Waveform Diversity and Design Conference

作者： Xue Li Ruolin Zhou Jian Zhang Vasu Chakravarthy Zhiqiang Wu Department of Electrical Engineering Wright State University Department of Mathematics & Computer Science Texas Woman's University Air Force Research Laboratory

Multi-carrier code division multiple access (MC-CDMA) has been considered as a strong candidate for next generation wireless communication system due to its excellent performance in multi-path fading channel and simple receiver structure. Carrier Interferometry code for MC-CDMA (CI/MC-CDMA) provides better BER performance, less peak to average power ratio (PAPR) and higher design flexibility than conventional MC-CDMA systems employing Hadarmard-Walsh spreading code. However, like all the multi-carrier transmission technologies such as orthogonal frequency division multiplexing (OFDM), the inter-carrier interference (ICI) produced by the frequency offset between the transmitter and receiver local oscillators or by Doppler frequency shift due to high mobility causes significant bit error rate (BER) performance degradation in CI/MC-CDMA system. In this paper, we apply the ICI self-cancellation scheme previously proposed for OFDM system to orthogonal CI/MC-CDMA system to reduce ICI effect and improve BER performance. Unlike the traditional ICI self-cancellation scheme for OFDM which reduces the ICI at the price of lowing the transmission rate and reducing the bandwidth efficiency, we introduce a second set of orthogonal CI codes to maintain the throughput. Simulations of different leveled modulations over AWGN channel and multi-path fading channel confirmed the effectiveness and efficiency of the proposed self-embedded ICI cancellation scheme for CI/MC-CDMA system where significant BER performance gain has been observed when ICI is present.

关键词： Multicarrier code division multiple access OFDM Bit error rate Receivers AWGN channels Modulation Fading

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Attosecond photonics for optical communications

Attosecond photonics for optical communications

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Optical Fiber Communication Conference, OFC 2012

作者： Nejadmalayeri, Amir H. Grein, Matthew E. Spector, Steven J. Khilo, Anatol Peng, Michael Y. Sander, Michelle Y. Wang, Jade Benedick, Andrew J. Sorace, Cheryl M. Geis, Michael W. Willis, Matthew M. Lennon, Donna M. Yoon, Jung U. Lyszczarz, Theodore M. Ippen, Erich P. Kärtner, Franz X. Research Laboratory of Electronics Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States Lincoln Laboratory Massachusetts Institute of Technology 244 Wood Street Lexington MA 02420 United States Center for Free-Electron Laser Science DESY and University of Hamburg 85 Notkestrae Hamburg 22607 Germany

Recent experiments have demonstrated that low-jitter mode locked lasers enable unprecedented high-resolution high-speed analog to digital conversion. That capability may be leveraged to bring spectral efficiency of op... 详细信息

ISBN: (纸本)9781557529381

关键词： Analog to digital conversion

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Unifying software and product configuration: A research roadmap

Unifying software and product configuration: A research road...

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Workshop on Configuration at ECAI, ConfWS 2012

作者： Hubaux, Arnaud Jannach, Dietmar Drescher, Conrad Murta, Leonardo Männistö, Tomi Czarnecki, Krzysztof Heymans, Patrick Nguyen, Tien Zanker, Markus PReCISE Research Center University of Namur Belgium Department of Computer Science TU Dortmund Germany Computing Laboratory University of Oxford United Kingdom Fluminense Federal University Niterói Brazil Aalto University School of Science Finland Generative Software Development Lab University of Waterloo Canada Electrical and Computer Engineering Department Iowa State University United States Alpen-Adria-Universität Klagenfurt Austria

For more than 30 years, knowledge-based product configuration systems have been successfully applied in many industrial domains. Correspondingly, a large number of advanced techniques and algorithms have been developed in academia and industry to support different aspects of configuration reasoning. While traditional research in the field focused on the configuration of physical artefacts, recognition of the business value of customizable software products led to the emergence of software product line engineering. Despite the significant overlap in research interests, the two fields mainly evolved in isolation. Only limited attempts were made at combining the approaches developed in the different fields. In this paper, we first aim to give an overview of commonalities and differences between software product line engineering and product configuration. We then identify opportunities for cross-fertilization between these fields and finally develop a research agenda to combine their respective techniques. Ultimately, this should lead to a unified configuration approach.

关键词： Knowledge based systems

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Combining gait research of the quadruped/biped reconfigurable walking chair with parallel leg mechanism

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4th International Conference on Social Robotics, ICSR 2012

作者： Hu, Xing Wang, Hongbo Sang, Lingfeng Gu, Qifang Yuan, Lin School of Mechanical and Electrical Engineering Xi'an University of Architecture and Technology Xi'an Shanxi 710055 China Ministry of Education Key Laboratory of Advanced Forging Technology and Science Hebei Province Key Laboratory of Parallel Robot and Mechatronics Systems Yanshan University Qinhuangdao Hebei 066004 China Department of Computer Wuxi City College of Vocational Technology Wuxi 214063 China

ISBN: (纸本)9783642341021

The quadruped/biped reconfigurable walking robot with parallel leg mechanism can realize not only the quadruped walking, but also the biped walking. The converting process from the quadruped to the biped includes locking the vertical revolute pair hinged with the upper platform and combining the corresponding lower platforms. Based on the previous study, the combining schemes of walking chair are researched in this paper, and then the correctness of the combining schemes is analyzed by using the position workspace of the swing leg and the body mechanism in different states which are obtained by the MATLAB software and anti-solution search method. Compared with the stability margin and the adjustment coordination of the body in the different combining schemes, the optimal combining gaits of walking chair are selected, which lays the theoretical foundation for the quadruped/biped converting control of walking chair. © 2012 Springer-Verlag.

关键词： MATLAB

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Multiple versus single quantum well transistor laser performances

Multiple versus single quantum well transistor laser perform...

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Integrated Photonics research, Silicon and Nanophotonics, IPRSN 2012

作者： Taghavi, Iman Kaatuzian, Hassan Leburton, Jean-Pierre Photonics Research Laboratory Amirkabir University of Technology Tehran 15914 Iran Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Urbana IL 61801 United States Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States

We present a transport-based model that can be used to investigate the optoelectronic operations of transistor lasers with multiple quantum well. Significant enhancement in device performances is anticipated when the ... 详细信息

ISBN: (纸本)9781557529466

关键词： Semiconductor quantum wells

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An effective use of spectrum usage estimation for IEEE 802.22 networks

An effective use of spectrum usage estimation for IEEE 802.2...

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IEEE Conference on Wireless Communications and Networking

作者： Saptarshi Debroy Shameek Bhattacharjee Mainak Chatterjee Kevin Kwiat Department of Electrical Engineering & Computer Science University of Central Florida Orlando Florida Air Force Research Laboratory Information Directorate Rome NY

IEEE 802.22 networks consist of base stations and consumer premise equipments (CPEs) where the base station in each cell opportunistically accesses and allocates (uplink and downlink) channels to all the CPEs in its cell. Information on white space (unused primary channels) availability is reported by the CPEs to the base stations. Thus, a base station's effectiveness to allocate channels are based on its ability to gauge the spectrum usage at various locations. In this paper, we propose a channel usage estimation framework where a base station uses the spectrum reports from other neighboring base stations to estimate the spectrum usage scenario at any arbitrary location within its cell. Our estimation framework is based on Shepard's interpolation technique for irregular points. We propose a channel allocation scheme that minimizes interference among CPEs and maximizes white space utilization. Through simulation experiments, we demonstrate the accuracy of the estimation technique, utilization of the available spectrum, and efficiency of allocation scheme. We also show that our scheme achieves very low false positives and no false negatives. Finally, we show that the optimal number of base stations that need to be consulted is in accordance with Shepard's bounds 1 .

关键词： Estimation Channel allocation Interpolation Channel estimation Resource management Base stations Downlink

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Picosecond Photoinduced Reflectivity Studies of GaN Prepared by Lateral Epitaxial Overgrowth

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

作者： M. Wraback H. Shen C. J. Eiting J. C. Carrano R. D. Dupuis U.S. Army Research Laboratory Sensors and Electron Devices Directorate Adelphi USA Microelectronics Research Center Department of Electrical Engineering University of Texas at Austin Austin USA WPAFB USA Photonics Research Center Department of Electrical Engineering and Computer Science U.S. Military Academy West Point USA

The pump-probe technique has been used to perform room temperature studies of the photoinduced changes in the reflectivity ΔR associated with exciton and carrier dynamics in GaN prepared by lateral epitaxial overgrowth. For resonant excitation of cold excitons, the ΔR decay possesses a 720 ps component attributed to the free exciton lifetime in this high quality material. For electrons with small excess energy (< 50 meV), the strong increase in the ΔR decay rate with decreasing excitation density suggests that screening of the Coulomb interaction may play an important role in the processes of carrier relaxation and exciton formation. The faster decay times at a given carrier density observed for hot (> 100 meV) electron relaxation are attributed to electron-hole scattering in conjunction with the screened electron-LO phonon interaction.

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Single-event transient sensitivity to gate bias in InAlSb/InAs/AlGaSb high electron mobility transistors

Single-event transient sensitivity to gate bias in InAlSb/In...

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2012 International Conference on Indium Phosphide and Related Materials, IPRM 2012

作者： Ramachandran, V. Schrimpf, R.D. Reed, R.A. Zhang, E. Shen, X. Pantelides, S.T. McMorrow, D. Brad Boos, J. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Institute for Space and Defense Electronics Vanderbilt University Nashville TN 37235 United States Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 United States Naval Research Laboratory Washington DC 20375 United States

ISBN: (纸本)9781467317252

We have characterized the single-event transient sensitivity to gate bias of InAlSb/InAs/AlGaSb high electron mobility transistors through experiments and simulations. These depletion-mode transistors exhibit increased charge collection as the gate bias moves from depletion toward threshold, similar to the response observed in floating body silicon-on-insulator devices. Maximum charge collection occurs near threshold, decreasing as the gate bias moves toward accumulation. The interplay between the longitudinal electric field in the channel and the vertical electric field underneath the gate affects the net radiation-generated charge in the InAs channel, which is responsible for the observed experimental trends. © 2012 IEEE.

关键词： High electron mobility transistors

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Building the case for automated building energy management 12

Building the case for automated building energy management

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4th ACM Workshop on Embedded systems for Energy Efficiency in Buildings, BuildSys 2012

作者： Marchiori, Alan Han, Qi Navidi, William C. Earle, Lieko United Technologies Research Center East Hartford CT United States Department of Electrical Engineering and Computer Science Colorado School of Mines Golden CO United States Department of Applied Mathematics and Statistics Colorado School of Mines Golden CO United States National Renewable Energy Laboratory Golden CO United States

ISBN: (纸本)9781450311700

Energy consumption in buildings comprises a significant fraction of total worldwide energy consumption and is strongly influenced by occupant behavior. To explore the quantitative effect of particular occupant actions on building energy consumption, we have evaluated eight energy-saving behaviors, as well as the use of an in-home display (IHD), in 10 homes over the course of ten weeks. The results showed maximum savings ranging from 0%-20% attributed to the IHD, indicating that real-time feedback combined with actionable suggestions can motivate substantial conservation. By examining the data along with pre and post-experiment surveys, we conclude that automation is necessary to ease the more tedious tasks such as "unplug when not in use" and "unplug the TV," where fewer than half of the highly capable and motivated participants performed the actions. © 2012 ACM.

关键词： Energy conservation

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