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International Conference on Parallel and Distributed systems (ICPADS)

作者： Wei Yan Vinod Muthusamy Zheng Xiao Mingwen Chen Xubin Pei Jianguang Hong Xingchen Heng Songlin Hu Dept. of Electrical Engineering and Computer Science Vanderbilt University TN USA IBM Thomas J. Waston Research Center NY USA State Grid Electricity Science Research Institute Beijing China Institute of Computing Technology Chinese Academy of Sciences Beijing China Zhejiang Electric Power Corporation Hangzhou China

This paper introduces the queue reorganization algorithm to alleviate congestion problem in pub/sub systems. Experimental studies show that our solution can greatly reduce the number of messages congested in the input... 详细信息

关键词： Subscriptions Routing Conferences Optimization Indexes Jacobian matrices Computational modeling

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Towards a large-scale, optical timing distribution system with sub-femtosecond residual timing jitter

Towards a large-scale, optical timing distribution system wi...

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IEEE International Frequency Control Symposium

作者： Michael Y. Peng Patrick T. Callahan Amir H. Nejadmalayeri Franz X. Kärtner Tony D. Roberts Philip Battle Stefano Valente Kemal Ahmed Ming Xin Eric Monberg Man Yan Lars Grüner-Nielsen John M. Fini Dept. of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Center for Free-Electron Laser Science Deutsches Elektronen-Synchrotron Hamburg Germany Deutsches Elektronen-Synchrotron Center for Free-Electron Laser Science Hamburg Germany AdvR Inc Bozeman MT USA OFS Laboratories Somerset NJ USA OFS Laboratories Somerset NJ US

We present here key technologies for an all-optical timing distribution system with sub-femtosecond precision. Timing distribution over a 1.2-km polarization-maintaining, fiber-optic link using balanced optical cross-correlators (BOC) for link stabilization was demonstrated for 16 days with 0.6 fs RMS timing drift and during a 3-day interval only 0.13 fs drift. Jitter characterization of two identical commercial femtosecond lasers using the BOC method verified sub-100-as timing jitter for frequencies above than 1 kHz. Preliminary operation of a fiber-coupled, hybrid-integrated BOC using periodically-poled KTiOPO 4 (PPKTP) waveguides indicate great potential for improved BOC timing sensitivities and overall system efficiency and robustness.

关键词： Timing Optical fiber polarization Optical fiber dispersion Ultrafast optics Timing jitter

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Spectral unmixing of three-algae mixtures using hyperspectral images

Spectral unmixing of three-algae mixtures using hyperspectra...

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IEEE Sensors Applications Symposium, SAS

作者： Mehrube Mehrubeoglu Paul V. Zimba Lifford L. McLauchlan Ming Y. Teng Mechanical Engineering and Engineering Technology Texas A&M University-Corpus Christi Corpus Christi Texas United States Dept. of Electrical Engineering and Computer Science Texas A&M University-Kingsville Kingsville Texas United States Center for Coastal Studies Texas A&M University-Corpus Christi Corpus Christi Texas United States Computer Science School of Engineering and Computing Sciences Texas A&M University-Corpus Christi Corpus Christi Texas United States

A hyperspectral imaging system has been used to acquire hyperspectral data representing various combinations of three pure algal mixtures in liquid media. Geometric and linear spectral unmixing methods have been applied to identify the ratiometric combinations of the algae in the mixtures. For the geometric method, two local spectral slopes have been identified as spectral features. Average feature values for each class of algae are used as vertices of a triangle, and then compared to the test features to predict algal ratios in the test mixture. The results are compared to those from classic linear spectral unmixing. In the two independent data sets prepared, the introduced geometric method produced more favorable results than the classical spectral unmixing method.

关键词： Algae Hyperspectral imaging Mathematical model Liquids Media Equations

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Liquid Sensing: Spoof Plasmon Surfaces: A Novel Platform for THz Sensing (Advanced Optical Materials 8/2013)

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Advanced Optical Materials 2013年第8期1卷 537-537页

作者： Ng, Binghao Wu, Jianfeng Hanham, Stephen M. Fernández-Domínguez, Antonio I. Klein, Norbert Liew, Yun Fook Breese, Mark B. H. Hong, Minghui Maier, Stefan A. Dept. of Physics Imperial College London London South Kensington United Kingdom Data Storage Institute Agency for Science Technology and Research 5 Engineering Drive 1 Singapore Center for Ion Beam Applications (CIBA) Dept. of Physics National University of Singapore 2 Science Drive 3 Singapore Dept. of Materials Imperial College London London South Kensington United Kingdom National Metrology Centre 1 Science Park Drive Singapore Dept. of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore

An Otto prism coupling setup with a spoof plasmon surface underneath is the centerpiece of work by S. A. Maier and co-workers, in which terahertz liquid sensing with figures-of-merit as high as 49 are demonstrated. On page 543, water molecules are shown to go onto the spoof plasmon surface, which consists of linear arrays of subwavelength grooves, tightly confining the spoof plasmons. The plasmons are sensitive to the refractive index of the dielectric filling the grooves, and phase jumps at spoof plasmon resonances provide the readout response. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Metamaterials Plasmonics Sensors Subwavelength materials THz

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Temperature distribution in a disc-type transformer winding

Temperature distribution in a disc-type transformer winding

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2012 7th IEEE Conference on Industrial Electronics and Applications, ICIEA 2012

作者： Wijaya, Jaury Guo, Wenyu Czaszejko, Tadeusz Martin, Daniel Lelekakis, Nick Susa, Dejan Dept. of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia Electric Power Technology SINTEF Energy Research Trondheim Norway

ISBN: (纸本)9781457721175

The winding hot-spot temperature is an extremely important factor limiting the loading capability of a power transformer. High temperature also accelerates the aging of paper insulation and thus reduces the lifetime of a transformer. Ohmic losses in the winding are the main source of heat inside a transformer. Precise knowledge of these losses is very important to determine the winding temperature distribution. Furthermore, in an oil-immersed power transformer, oil is used both as insulation and as liquid coolant. In a disc-type winding, a non-uniform coolant flow, in horizontal ducts, can contribute to local overheating. This article describes a new approach to estimate the winding temperature distribution, in which losses are computed by the finite element method whereas the coolant circulation and the temperature distribution are obtained from a thermal-hydraulic network representation of the winding. © 2012 IEEE.

关键词： Power transformers

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Effect of static eccentricity in back-EMF of Axial Flux Permanent Magnet Machines

Effect of static eccentricity in back-EMF of Axial Flux Perm...

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21st International Symposium on Power Electronics, electrical Drives, Automation and Motion, SPEEDAM 2012

作者： Mirimani, Seyyed Mehdi Vahedi, Abolfazl Marignetti, Fabrizio Center of Excellence for Power Systems Automation and Operation Dept. of Electrical Engineering Iran University of Science and Technology Tehran Iran Department of Electrical and Information Engineering University of Cassino and Southern Latium Italy

ISBN: (纸本)9781467312998

This paper studies the effects of static eccentricity on back-EMF of Axial Flux Permanent Magnet Machines (AFPMM). Effect of static eccentricity on back-EMF of AFPMs has not been studied before. Many studies have demonstrated that accurately assessing the behavior of Axial Flux PM Machines is not an easy task. Use of numerical modeling makes it possible to precisely study the eccentricity in these types of machines. Recently, modeling of AFPMs has been done by finite-element (FE) analysis. Most of the models are based on the reduction of the 3D problem to a 2D problem that is not accurate. In this paper a surface mounted axial flux permanent magnet (AFPM) motor with a core of soft magnetic composite (SMC) material is modeled using 3-D finite element method. The proposed model in this paper takes into account MMF harmonics, stator and rotor core. 3-D electromagnetic finite element method (FEM) is used to calculate flux density in the air-gap, rotor back iron, and stator iron and to simulate the electromotive force (back EMF). This study indicates that static eccentricity has noticeable effects on back-EMF of coils of a phase and it introduces a good criterion for fault detection. © 2012 IEEE.

关键词： Finite element method

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Adaptive light field sampling and sensor fusion for smart lighting control

Adaptive light field sampling and sensor fusion for smart li...

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15th International Conference on Information Fusion, FUSION 2012

作者： Dong, Fangxu Hombal, Vadiraj Sanderson, Arthur C. Smart Lighting Engineering Research Center Dept. of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 United States Dept. of Civil and Environmental Engineering Vanderbilt University Nashville TN 37201 United States

ISBN: (纸本)9780982443859

For the development of flexible and adaptive control in smart lighting, it is important to have a systematic methodology for monitoring the generated light field and for fusion of the sensor information. This paper introduces a systematic approach to light field sampling using a distributed sensor network. This approach is based on the multiscale representation of the light field and adaptive selection of sample locations to maximize the information obtained from the field. Experimental results have shown that a systematic selection of sensor locations can significantly reduce the error in representation of the light field with corresponding improvement in the lighting control. © 2012 ISIF (Intl Society of Information Fusi).

关键词： Lighting

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Data sharing in multi-threaded applications and its impact on chip design

Data sharing in multi-threaded applications and its impact o...

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2012 IEEE International Symposium on Performance Analysis of systems and Software, ISPASS 2012

作者： Krishna, Anil Samih, Ahmad Solihin, Yan Systems and Technology Group International Business Machines Inc. United States Dept. of Electrical and Computer Engineering North Carolina State University United States

ISBN: (纸本)9781467311441

Analytical modeling is becoming an increasingly important technique used in the design of chip multiprocessors. Most such models assume multi-programmed workload mixes and either ignore or oversimplify the behavior of multi-threaded applications. In particular, data sharing observed in multi-threaded applications, and its impact on chip design decisions, has not been well characterized in prior analytical modeling work. In this work we describe why data sharing behavior is hard to capture in an analytical model, and study why, and by how much, past attempts have fallen short. We propose a new methodology to measure the impact of data sharing, which quantifies the reduction in on-chip cache miss rates attributable solely to the presence of data sharing. We then extend an existing analytical performance model for a many-core chip by incorporating into it the impact of data sharing in contemporary multi-threaded workloads. We use this analytical model to explore the chip design space for a hypothetical many-core chip of the future. We find that the optimal design point is substantially different when the impact of data sharing is modeled compared to when it is not. Data sharing can enable reassigning a significant fraction of the total chip area (up to 16%, per our model of a future many-core) from cache resources to core resources, which, in turn, improves the overall chip throughput (by up to 58%). © 2012 IEEE.

关键词： Analytical models

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Formal abstraction of linear systems via polyhedral Lyapunov functions?

Formal abstraction of linear systems via polyhedral Lyapunov...

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4th IFAC Conference on Analysis and Design of Hybrid systems, ADHS'12

作者： Ding, Xuchu Lazar, Mircea Belta, Calin Dept. of Systems United Technologies Research Center East Hartford CT 06108 United States Dept. of Electrical Engineering at Eindhoven University of Technology Eindhoven Netherlands Dept. of Mechanical Engineering Boston University Brookline MA 02446 United States

ISBN: (纸本)9783902823007

In this paper we present an abstraction algorithm that produces a finite bisimulation quotient for an autonomous discrete-time linear system. We assume that the bisimulation quotient is required to preserve the observations ovxer an arbitrary, finite number of polytopic subsets of the system state space. We generate the bisimulation quotient with the aid of a sequence of contractive polytopic sublevel sets obtained via a polyhedral Lyapunov function. The proposed algorithm guarantees that at iteration i, the bisimulation of the system within the i-th sublevel set of the Lyapunov function is completed. We then show how to use the obtained bisimulation quotient to verify the system with respect to arbitrary Linear Temporal Logic formulas over the observed regions. © 2012 IFAC.

关键词： Lyapunov functions

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Self-learning of edge-preserving single image super-resolution via contourlet transform

Self-learning of edge-preserving single image super-resoluti...

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2012 13th IEEE International Conference on Multimedia and Expo, ICME 2012

作者： Yang, Min-Chun Huang, De-An Tsai, Chih-Yun Wang, Yu-Chiang Frank Dept. Computer Science and Information Engineering National Taiwan University Taipei Taiwan Dept. Electrical Engineering National Taiwan University Taipei Taiwan Research Center for Information Technology Innovation Academia Sinica Taipei Taiwan

ISBN: (纸本)9781467316590

We present a self-learning approach for single image super-resolution (SR), with the ability to preserve high frequency components such as edges in resulting high resolution (HR) images. Given a low-resolution (LR) input image, we construct its image pyramid and produce a super pixel dataset. By extracting context information from the super-pixels, we propose to deploy context-specific contour let transform on them in order to model the relationship (via support vector regression) between the input patches and their associated directional high-frequency responses. These learned models are applied to predict the SR output with satisfactory quality. Unlike prior learning-based SR methods, our approach advances a self-learning technique and does not require the self similarity of image patches within or across image scales. More importantly, we do not need to collect training LR/HR image data in advance and only require a single LR input image. Empirical results verify the effectiveness of our approach, which quantitatively and qualitatively outperforms existing interpolation or learning-based SR methods. © 2012 IEEE.

关键词： Frequency response

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