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2010 MRS Fall Meeting

作者： Nakashima, Seiji Tsujita, Yosuke Fujisawa, Hironori Park, Jung Min Kanashima, Takeshi Okuyama, Masanori Shimizu, Masaru Depattment of Electrical Engineering and Computer Sciences Graduate School of Engineering University of Hyogo 2167 Shosya Himeji Hyogo 671-2280 Japan Department of Systems Innovation Graduate School of Engineering Science Osaka University 1-3 Machikaneyama-cho Toyonaka Osaka 560-8531 Japan Institute for NanoScience Design Osaka University 1-3 Machikaneyama-cho Toyonaka Osaka 560-8531 Japan

ISBN: (纸本)9781605112695

BiFeO3 (BFO) thin films have been deposited on SrRuO 3/SrTiO3 (001) substrate by using ion beam sputtering process. At low oxygen partial pressure of 11 m Pa, rhombohedral and large c/a mixed phase thin film have been obtained in spite of rhombohedral BFO single phase formation at high oxygen partial pressure of 73 mPa. From wide area 2θ-ψ mappings, diffraction peaks from large c/a phase BFO thin film were obtained with the same extinction rule as those of rhombohedral BFO. Reciprocal space mappings around BFO (003) and BFO (103) spots indicate that lattice parameters of large c/a phase BFO were a = 0.381 nm and c = 0.461 nm (c/a = 1.22), respectively. Moreover ferroelectric domain switching could be observed in both of rhombohedral BFO and mixed phase BFO thin films. © 2011 Materials Research Society.

关键词： Strontium compounds

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Partitioned latency insertion method (PLIM) with stability considerations

Partitioned latency insertion method (PLIM) with stability c...

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IEEE Workshop on Signal Propagation on Interconnects (SPI)

作者： Patrick Goh José E. Schutt-Ainé Dmitri Klokotov Jilin Tan Ping Liu Wenliang Dai Feras Al-Hawari Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA Cadence Design Systems Chelmsford MA USA

In this paper, we present a modular approach to the high frequency simulation of large networks by utilizing the latency insertion method (LIM) and considering the stability criteria of partitions of different latencies in the circuit. This results in a robust algorithm that is able to preserve the stability condition while improving the runtime of the overall transient simulation. An extension to the LIM to handle dependent sources is also presented, along with a generalized stability criteria for selecting a maximum stable time step.

关键词： Integrated circuit modeling Niobium RLC circuits Stability criteria Topology Equations

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WEC prototype advancement with consideration of a real-time damage accumulation algorithm

WEC prototype advancement with consideration of a real-time ...

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2011 IEEE PES Trondheim PowerTech: The Power of Technology for a Sustainable Society, POWERTECH 2011

作者： Stillinger, Chad J. Brekken, Ted K. A. Von Jouanne, Annette Paasch, Robert Naviaux, David Rhinefrank, Ken Prudell, Joseph Schacher, Al Hammagren, Erik IEEE United States Department of Energy Systems Oregon State University Corvallis OR United States United States School of Electrical Engineering and Computer Science Oregon State University United States Department of Mechanical Design School of Mechanical Industrial and Manufacturing Engineering Oregon State University United States Northwest National Marine Renewable Energy Center United States

ISBN: (纸本)9781424484195

Machine maintenance and repair is not a trivial issue when it comes to renewable energy devices. It has been said that one of the most important factors in enhancing the marketability of wind energy is to cut its overall maintenance costs, which is about 10% - 20% of the overall cost of energy [1]. The average maintenance and repair costs of ocean wave energy devices are yet to be determined, but it may be higher than wind energy. The harsh ocean environment, repeated cycling of the drive train, coastal storms, environmental concerns, loss of revenue due to long periods of machine downtime, safety issues concerning technicians working on the buoy while it's still in operation, and so forth, all add to the maintenance and repair costs of a WEC (Wave Energy Converter). This study proposes a unique damage accumulation prediction algorithm that enables real-time determination of bearing fatigue life. © 2011 IEEE.

关键词： Wind power

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Enhanced DHCP for the fast retrieval of the spectrum map for white space applications

Enhanced DHCP for the fast retrieval of the spectrum map for...

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IEEE Conference on Wireless Communications and Networking

作者： Seungil Yoon Kyutae Lim Jongman Kim Georgia Electronic Design Center School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA KORUS Research Center of Informersive Systems School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

As white space, unused local TV spectrum, will be allowed for the broadband Internet access, we can use white space network as the supplementary network of licensed and/or unlicensed access networks such as cellular and WiFi™ networks. Thus, after setting up the connection over a cellular or WiFi™ system, mobile devices equipped with a white space interface will connect to a radio resource management server to retrieve a location-based list of open white space channels, “a so-called spectrum map”. This paper aims to reduce a signaling overhead for the setup of a cellular or WiFi™ connection and the retrieval of the spectrum map. To achieve the goal, we suggest embedding the retrieval operations of the spectrum map inside the Dynamic Host Configuration Protocol (DHCP) operations for the IP assignment during the connection setup of the cellular or WiFi™ networks. The theoretical analysis demonstrates that our proposal, the fast provision of the spectrum map, can contribute to accommodating one or more white space devices when the total number of open white space channels is 30.

关键词： Servers White spaces Proposals IP networks IEEE 802.11 Standards Sensors Resource management

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Structural and Ferroelectric Properties of Large c/a Phase Bismuth Ferrite Thin Films Prepared by Ion Beam Sputtering

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MRS Online Proceedings Library 2011年第1期1292卷 3-8页

作者： Seiji Nakashima Yosuke Tsujita Hironori Fujisawa Jung Min Park Takeshi Kanashima Masanori Okuyama Masaru Shimizu Depattment of Electrical Engineering and Computer Sciences Graduate School of Engineering University of Hyogo Himeji Hyogo Japan Department of Systems Innovation Graduate School of Engineering Science Osaka University Toyonaka Osaka Japan Institute for NanoScience Design Osaka University Toyonaka Osaka Japan

BiFeO3 (BFO) thin films have been deposited on SrRuO3/SrTiO3 (001) substrate by using ion beam sputtering process. At low oxygen partial pressure of 11 m Pa, rhombohedral and largec/a mixed phase thin film have been obtained in spite of rhombohedral BFO single phase formation at high oxygen partial pressure of 73 mPa. From wide area 2θ-Ψ mappings, diffraction peaks from large c/a phase BFO thin film were obtained with the same extinction rule as those of rhombohedral BFO. Reciprocal space mappings around BFO (003) and BFO (103) spots indicate that lattice parameters of largec/a phase BFO werea = 0.381 nm andc = 0.461 nm (c/a =1.22), respectively. Moreover ferroelectric domain switching could be observed in both of rhombohedral BFO and mixed phase BFO thin films.

关键词： ion-beam processing ferroelectric thin film

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SMC methods: A review and discussion

SMC methods: A review and discussion

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IEEE International Conference on systems, Man and Cybernetics

作者： Mo Jamshidi Keith W. Hipel James M. Tien Department of Electrical and Computer Engineering University of Texas San Antonio TX USA Systems Design Engineering University of Waterloo Waterloo ONT Canada College of Engineering University of Miami Coral Gables FL USA

Motivated by example problems arising in energy, environment and service systems, the panelists will review those systems, man and cybernetics methods that are essential in dealing with these problems. The focus will be on new model-based and computational techniques, including approaches concerned with systems of systems, conflict resolution and adaptive real-time decision making. Although the organizers will initially serve as panel presenters, it is expected that they will also act as facilitators in an ensuing discussion among conference attendees who are cordially invited to participate in this specially organized panel.

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Compressive System Identification of LTI and LTV ARX Models

Compressive System Identification of LTI and LTV ARX Models

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IEEE Conference on Decision and Control

作者： Borhan M. Sanandaji Tyrone L. Vincent Michael B. Wakin Roland Toth Kameshwar Poolla Department of Electrical Engineering and Computer Science Colorado School of Mines Golden CO 80401 USA Delft Center for Systems and Control Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands Departments of Electrical Engineering and Computer Sciences and Mechanical Engineering University of California Berkeley CA 94720 USA

ISBN: (纸本)9781612848006

In this paper, we consider identifying Auto Regressive with eXternal input (ARX) models for both Linear Time-Invariant (LTI) and Linear Time-Variant (LTV) systems. We aim at doing the identification from the smallest possible number of observations. This is inspired by the field of Compressive Sensing (CS), and for this reason, we call this problem Compressive System Identification (CSI). In the case of LTI ARX systems, a system with a large number of inputs and unknown input delays on each channel can require a model structure with a large number of parameters, unless input delay estimation is performed. Since the complexity of input delay estimation increases exponentially in the number of inputs, this can be difficult for high dimensional systems. We show that in cases where the LTI system has possibly many inputs with different unknown delays, simultaneous ARX identification and input delay estimation is possible from few observations, even though this leaves an apparently ill-conditioned identification problem. We discuss identification guarantees and support our proposed method with simulations. We also consider identifying LTV ARX models. In particular, we consider systems with parameters that change only at a few time instants in a piecewise-constant manner where neither the change moments nor the number of changes is known a priori. The main technical novelty of our approach is in casting the identification problem as recovery of a block-sparse signal from an underdetermined set of linear equations. We suggest a random sampling approach for LTV identification, address the issue of identifiability and again support our approach with illustrative simulations.

关键词： LTI System identification delay estimation Mathematic Identifiability Model structures

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Performance analysis of space-time block codes over generalized-K fading MIMO channels

Performance analysis of space-time block codes over generali...

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IEEE Swedish Communication Technologies Workshop (Swe-CTW)

作者： Michail Matthaiou Nestor D. Chatzidiamantis Himal A. Suraweera George K. Karagiannidis Department of Signals and Systems Chalmers University of Technology Gothenburg Sweden Department of Electrical & Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece Engineering Product Development Singapore University of Technology and Design Singapore

This paper elaborates on the performance of orthogonal space-time block codes (STBCs) for multiple-input multiple-output (MIMO) systems operating in generalized-K fading conditions. The considered fading model is generic since it intimately encompasses both small-scale fading (modeled via the Nakagami-m distribution) and large-scale fading (modeled via the gamma distribution). In the following, new exact analytical expressions are derived for the Shannon capacity along with asymptotic expressions in the high and low Signal-to-Noise ratio (SNR) regimes. We also present exact tractable expressions followed by first-order expansions for the marginal outage probability and symbol error rate (SER); further, we quantify the performance of STBCs in terms of diversity order and coding gain. The derived analytical expressions are validated via a set of Monte-Carlo simulations which also demonstrate the implications of the model parameters on the overall performance.

关键词： Signal to noise ratio MIMO Shadow mapping Wideband Rayleigh channels Analytical models

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Cochlear Implant Speech Processing Using Wavelet Transform

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International Scholarly Research Notices 2012年第1期2012卷

作者： M. Mehrzad M. D. Abolhassani A. H. Jafari J. Alirezaie M. Sangargir Medical Physics & Biomedical Engineering Department Tehran University of Medical Sciences Tehran *** Irantums.ac.ir Biomedical Group Research Centre for Science and Technology in Medicine Tehran 14185615 Iran Department of Electrical and Computer Engineering Ryerson University Toronto ON Canada M5B 2K3ryerson.ca Department of Systems Design Engineering University of Waterloo Waterloo ON Canada N2L 3G1uwaterloo.ca

We present a method for coding speech signals for the simulation of a cochlear implant. The method is based on a wavelet packet decomposition strategy. We used wavelet packet db4 for 7 levels, generated a series of channels with bandwidths exactly the same as nucleus device, and applied an input stimulus to each channel. The processed signal was then reconstructed and compared to the original signal, which preserved the contents to a high percentage. Finally, performance of the wavelet packet decomposition in terms of computational complexity was compared to other commonly used strategies in cochlear implants. The results showed the power of this method in processing of the input signal for implant users with less complexity than other methods, while maintaining the contents of the input signal to a very good extent.

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A Small-Gain Methodology for Networks of iISS Retarded systems based on Lyapunov-Krasovskii Functionals

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IFAC Proceedings Volumes 2011年第1期44卷 5100-5105页

作者： Hiroshi Ito Zhong-Ping Jiang Pierdomenico Pepe Department of Systems Design and Informatics Kyushu Institute of Technology Iizuka Fukuoka 820-8502 Japan Department of Electrical and Computer Engineering Polytechnic Institute of New York University Brooklyn NY 11201 USA Department of Electrical and Information Engineering University of L'Aquila 67040 Poggio di Roio L'Aquila Italy

Abstract A problem of assessing stability of retarded dynamical networks is solved in this paper. Subsystems are assumed to be integral input-to-state stable (iISS). Time-delays are allowed to reside in both subsystems and interconnection channels, and may be both discrete and distributed. No assumption is made on the interconnection topology. This paper develops a small-gain methodology for constructing a Lyapunov-Krasovskii functional of such a network.

关键词： Time delay Large-scale systems Nonlinear systems Lyapunov-Krasovskii functionals Integral input-to-state stability (iISS)

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