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Asia-Pacific Microwave Conference

作者： Jonmei J. Yan Chan-Sei Yoo Elizabeth M. Trask Dongsu Kim Peter M. Asbeck Electrical and Computer Engineering Dept. University of California San Diego La Jolla CA USA. Electronic Materials & Device Research Center Korea Electronics Technology Institute Korea. Packaging Research Center Korea Electronics Technology Institute Korea.

ISBN: (纸本)9781479914739

Although envelope tracking power amplifiers have significantly higher efficiency in back-off than constant supply Class AB amplifiers, there is nonetheless an impact of modulation peak-to-average power ratio (PAPR) on the overall system efficiency. This paper provides experimental results and analysis of efficiency of a GaN RF amplifier with peak power 100W under envelope tracking, as a function of PAPR over the range 6.5dB to 10dB. The analysis shows that the RF transistor knee voltage relative to its maximum drain voltage, and the output power of the envelope amplifier relative to its maximum output power, are major determinants of the efficiency roll-off.

关键词： envelope tracking (ET) power amplifier efficiency crest factor gallium nitride (GaN) peak-to-average power ratio (PAPR)

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Hardware Architecture of Polyphase Filter Banks Performing Embedded Resampling for Software-Defined Radio Front-Ends

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ZTE Communications 2012年第1期10卷 54-62,70页

作者： Mehmood Awan Yannick Le Moullec Peter Koch Fred Harris Technology Platforms Section Dept. of Electronic Systems Aalborg University Dept. of Electrical & Computer Engineering San Diego State University

In this paper, we describe resourceefficient hardware architectures for softwaredefined radio （SDR） frontends. These architectures are made efficient by using a polyphase channelizer that performs arbitrary sample rate changes, frequency selection, and bandwidth control. We discuss area, time, and power optimization for field programmable gate array （FPGA） based architectures in an Mpath polyphase filter bank with modified Npath polyphase filter. Such systems allow resampling by arbitrary ratios while simultaneously performing baseband aliasing from center frequencies at Nyquist zones that are not multiples of the output sample rate. A nonmaximally decimated polyphase filter bank, where the number of data loads is not equal to the number of M subfilters, processes M subfilters in a time period that is either less than or greater than the Mdataload ＇ s time period. We present a loadprocess architecture （LPA） and a runtime architecture （RA）（based on serial polyphase structure） which have different scheduling. In LPA, Nsubfilters are loaded, and then M subfilters are processed at a clock rate that is a multiple of the input data rate. This is necessary to meet the output time constraint of the down-sampled data. In RA, Msubfilters processes are efficiently scheduled within Ndataload time while simultaneously loading N subfilters. This requires reduced clock rates compared with LPA, and potentially less power is consumed. A polyphase filter bank that uses different resampling factors for maximally decimated, underdecimated, overdecimated, and combined upand downsampled scenarios is used as a case study, and an analysis of area, time, and power for their FPGA architectures is given. For resourceoptimized SDR frontends, RA is superior for reducing operating clock rates and dynamic power consumption. RA is also superior for reducing area resources, except when indices are prestored in LUTs.

关键词： SDR FPGA Digital Frontends Polyphase Filter Bank Embedded Resampling

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Introducing agent evictions to improve application placement in wireless distributed systems

Introducing agent evictions to improve application placement...

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41st International Conference on Parallel Processing, ICPP 2012

作者： Tziritas, Nikos Lampsas, Petros Lalis, Spyros Loukopoulos, Thanasis Khan, Samee Ullah Xu, Cheng-Zhong Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518067 China Dept. of Informatics and Computer Technology Technological Educational Institute of Lamia Lamia Greece Computer and Communication Engineering Dept. University of Thessaly Volos Greece Department of Electrical and Computer Engineering North Dakota State University Fargo ND 58108-6050 United States Department of Electrical and Computer Engineering Wayne State University Detroit MI 48202 United States Center for Research and Technology Institute of Thessaly Volos Greece

ISBN: (纸本)9780769547961

With the development of mobile code frameworks for embedded systems, an application can be structured as a set of cooperating components (agents) that are placed on the nodes of the system in a flexible way. Reducing the network traffic caused by the application components is a crucial issue for the increase in the lifetime of wireless embedded systems, since it is widely known that the communication cost plays the most significant role in the energy consumption of embedded devices. To this end, most placement algorithms place or move an agent towards the center of gravity of the communication workload. However, if the target node does not have enough capacity, the attempt is usually aborted. In this paper, we introduce eviction-enabled algorithms that allow nodes to free capacity by forcing a locally hosted agent to move to another node, even at a loss, to accept a new and potentially more beneficial agent. To the best of our knowledge, this is the first time that agents are evicted by local hosts to enable beneficial agent migrations and eventually improve the total network cost. In this paper, we provide algorithms tackling the aforementioned problem in a fully distributed manner. We also present and discuss the results of extensive simulations, showing that eviction-enabled algorithms can outperform their counterparts by up to 300%. © 2012 IEEE.

关键词： Mobile agents

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An exponential moving average algorithm

An exponential moving average algorithm

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2012 IEEE Congress on Evolutionary Computation, CEC 2012

作者： Haynes, David Corns, Steven Venayagamoorthy, Ganesh Kumar Systems Design Aclara St. Louis MO United States Engineering Management and Systems Engineering Dept. Missouri University of Science and Technology Rolla MO United States Holcombe Department of Electrical and Computer Engineering Clemson University Clemson SC 29634 United States

ISBN: (纸本)9781467315098

Techniques to reduce the search space when an optimizer seeks an optimal value are studied in this paper. A new mutation technique called the "Exponential Moving Average" algorithm (EMA) is introduced. The performance of EMA algorithms is compared to two other similar Computational Intelligence (CI) algorithms (an ordinary Evolutionary Algorithm (EA) and a "Mean-Variance Optimization" (MVO)) to solve a multi-dimensional problem which has a large search space. The classic Sudoku puzzle is chosen as the problem with a large search space. © 2012 IEEE.

关键词： Evolutionary algorithms

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Corrigendum to “Jamming effect analysis of infrared reticle seeker for directed infrared countermeasures” [Infrared Phys. Technol. 55/5 (2012) 431–441]

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Infrared Physics & technology 2013年 56卷 100-100页

作者： Tae-Wuk Bae Byoung-Ik Kim Young-Choon Kim Sang-Ho Ahn Stanford Center for Image Systems Engineering Stanford University CA 94305 USA School of Electrical Engineering and Computer Science Kyungpook National University South Korea Dept. of Information and Communication Engineering Youngdong University South Korea Dept. of Electronic Engineering Inje University South Korea

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Dynamic network structure identification with prediction error methods - Basic examples

Dynamic network structure identification with prediction err...

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Universite Libre de Bruxelles

作者： Dankers, Arne G. Van Den Hof, Paul M.J. Heuberger, Peter S.C. Bombois, Xavier Delft Center for Systems and Control Delft University of Technology Mekelweg 2 2628 CD Delft Netherlands Dept. of Electrical Engineering Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven Netherlands

ISBN: (纸本)9783902823069

Modeling of dynamical properties of highly complex and interconnected systems becomes important in different fields of science. When identifying the structure and dynamics of a network of interconnected dynamical systems, including cause-effect relations, there is a tendency to use nonparametric or FIR models of the output error type. In this paper it is shown, and illustrated by some simple examples, that appropriate attention should be given to using flexible noise models, in order to allow consistent identification of the dynamics, while the use of external excitation/probing signals may reduce this need. It is a first step towards using prediction error identification tools to identify the structure of a network. © 2012 IFAC.

关键词： Network topology

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The DeSyRe project: On-demand system reliability

The DeSyRe project: On-demand system reliability

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15th Euromicro Conference on Digital System Design, DSD 2012

作者： Sourdis, I. Strydis, C. Bouganis, C.S. Falsafi, B. Gaydadjiev, G.N. Malek, A. Mariani, R. Pnevmatikatos, D. Pradhan, D.K. Rauwerda, G. Sunesen, K. Tzilis, S. Chalmers University of Technology Computer Science and Engineering Dept. Sweden University of Bristol Computer Science Dept. United Kingdom École Polytechnique Fédérale de Lausanne Computer and Communication Sciences EPFL Switzerland Greece Imperial College London Electrical and Electronic Engineering Dept. United Kingdom Neurasrnus B.V. Netherlands Yogitech SpA Italy Recore Systems B.V. Netherlands

ISBN: (纸本)9780769547985

The DeSyRe project builds on-demand adaptive and reliable systems-on-Chips (SoCs). As fabrication technology scales down, chips are becoming less reliable, thereby incurring increased power and performance costs for fault tolerance. To make matters worse, power density is becoming a significant limiting factor in SoC design, in general. In the face of such changes in the technological landscape, current solutions for fault tolerance are expected to introduce excessive overheads in future systems. Moreover, attempting to design and manufacture a totally defect-/fault-free system, would impact heavily, even prohibitively, the design, manufacturing, and testing costs, as well as the system performance and power consumption. In this context, DeSyRe will deliver a new generation of systems that are reliable by design at well-balanced power, performance, and design costs. © 2012 IEEE.

关键词： System-on-chip

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Multi-genome core pathway identification through gene clustering

Multi-genome core pathway identification through gene cluste...

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8th International Workshop on Artificial Intelligence Applications and Innovations, AIAI 2012: AIAB, AIeIA, CISE, COPA, IIVC, ISQL, MHDW, and WADTMB

作者： Vitsios, Dimitrios M. Psomopoulos, Fotis E. Mitkas, Pericles A. Ouzounis, Christos A. Dept. of Electrical and Computer Engineering Aristotle University of Thessaloniki GR541 24 Thessaloniki Greece Institute of Agrobiotechnology Center for Research and Technology Hellas GR570 01 Thessaloniki Greece

ISBN: (纸本)9783642334115

In the wake of gene-oriented data analysis in large-scale bioinformatics studies, focus in research is currently shifting towards the analysis of the functional association of genes, namely the metabolic pathways in which genes participate. The goal of this paper is to attempt to identify the core genes in a specific pathway, based on a user-defined selection of genomes. To this end, a novel methodology has been developed that uses data from the KEGG database, and through the application of the MCL clustering algorithm, identifies clusters that correspond to different "layers" of genes, either on a phylogenetic or a functional level. The algorithm's complexity, evaluated experimentally, is presented and the results on a characteristic case study are discussed. © 2012 IFIP International Federation for Information Processing.

关键词： Clustering algorithms

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Development of memorizing system with action selection based on consciousness and behavior of animal on robot systems

Development of memorizing system with action selection based...

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2012 21st IEEE International Symposium on Robot and Human Interactive Communication, RO-MAN 2012

作者： Jitviriya, Wisanu Yoshida, Motoki Tanaka, Kyoko Hayashi, Eiji Graduated School of Electrical Engineering King Mongkut's University of Technology North Bangkok 10800 Thailand Graduated School of Computer Science and Systems Engineering Kyushu Institute of Technology 820-8502 Kyushu Japan Dept. of Mechanical Information Science and Technology Kyushu Institute of Technology 820-8502 Kyushu Japan

ISBN: (纸本)9781467346054

This paper focuses on the development of interaction between humans and robots, we decided to give the robotic arm has a consciousness and an emotional behavior in the same way as humans and animals. Thus, we have developed the hierarchical structure model which is the relationship between consciousness field and behavior module. The model is called Consciousness-Base Architecture (CBA) that was combined with the motivation module. Moreover, the ability to learn and remember the situations, it is necessary to make for more intelligent robot. Thereby, we attempt to build a memory module in the robot system. The memory for such system needs to efficiently organize and recognize previous experience in order to retrieve the relevant data and compared with the current situation. In this paper, we present the evaluation function for autonomous action selection, the memory module has been built and the behavior of the robotic arm has been verified in the experiment. © 2012 IEEE.

关键词： Motivation

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Comparison of two independent lidar-based pitch control designs 50

Comparison of two independent lidar-based pitch control desi...

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50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

作者： Dunne, Fiona Schlip, David Pao, Lucy Y. Wright, Alan D. Jonkman, Bonnie Kelley, Neil Simley, Eric Dept. of Electrical Computer and Energy Engineering University of Colorado Boulder CO United States Institute of Aircraft Design Universität Stuttgart Germany National Wind Technology Center NREL Golden CO United States

ISBN: (数字)9781600869365

Two different lidar-based feedforward controllers have previously been designed for the NREL 5 MW wind turbine model under separate studies. One uses a finite-impulse-response design, with 5 seconds of preview, and three rotating lidar measurements. The other uses a static-gain design, with the preview time defined by the pitch actuator dynamics, a simulation of a real nacelle-based scanning lidar system, and a lowpass filter defined by the lidar configuration. These controllers are now directly compared under the same lidar configuration, in terms of fatigue load reduction, rotor speed regulation, and power capture. The various differences in design choices are discussed and compared. We also compare frequency plots of individual pitch feedforward and collective pitch feedforward load reductions, and we see that individual pitch feedforward is effective mainly at the once-per-revolution and twice-per-revolution frequencies. We also explain how to determine the required preview time by breaking it down into separate parts, and we then compare it to the expected preview time available. © 2012 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Optical radar

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