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14th International Workshop on THERMal INvestigation of ICs and systems, THERMINIC 2008

作者： Janicki, M. Vermeersch, B. Banaszczyk, J. Kaminski, M. De Mey, G. Napieralski, A. Radon Institute for Computational and Applied Mathematics Austrian Academy of Sciences Altenbergerstrasse 69 4040 Linz Austria Department of Microelectronics and Computer Science Technical University of Lodz Al. Politechniki 11 93-590 Lodz Poland Department of Electronics and Information Systems University of Ghent Sint Pietersnieuwstraat 41 9000 Ghent Belgium

ISBN: (纸本)9782355000089

This paper investigates the possibility of assessing the die attach quality by the spectral analysis of the recorded device time response. The conducted analyses of the measured and the simulated time constant spectra of the thermal response allowed the explanation of the anomalous electrical oscillations observed during the operation of a power converter.© EDA Publishing/THERMINIC 2008.

关键词： Spectrum analysis

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Efficient nonlocal-means denoising using the SVD

Efficient nonlocal-means denoising using the SVD

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IEEE International Conference on Image Processing

作者： Jeff Orchard Mehran Ebrahimi Alexander Wong Cheriton School of Computer Science University of Waterloo Waterloo ONT Canada Department of Applied Mathematics University of Waterloo Waterloo ONT Canada Systems Design Engineering Department University of Waterloo Waterloo ONT Canada

Nonlocal-means (NL-means) is an image denoising method that replaces each pixel by a weighted average of all the pixels in the image. Unfortunately, the method requires the computation of the weighting terms for all possible pairs of pixels, making it computationally expensive. Some short-cuts assign a weight of zero to any pixel pairs whose neighbourhood averages are too dissimilar. In this paper, we propose an alternative strategy that uses the SVD to more efficiently eliminate pixel pairs that are dissimilar. Experiments comparing this method against other NL-means speed-up strategies show that its refined discrimination between similar and dissimilar pixel neighbourhoods significantly improves the denoising effect.

关键词： Noise reduction Pixel Additive white noise Filters Image denoising computer science mathematics Design engineering systems engineering and theory Gaussian noise

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Assessment of die attach quality by analysis of circuit thermal response spectrum

Assessment of die attach quality by analysis of circuit ther...

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International Workshop on Thermal Investigation of ICs and systems (THERMINIC)

作者： M. Janicki B. Vermeersch J. Banaszczyk M. Kaminski G. De Mey A. Napieralski Department of Microelectronics and Computer Science Technical University of Lodz Lodz Poland Austrian Academy of Sciences Radon Institute for Computational and Applied Mathematics Linz Austria Department of Electronics and Information Systems University of Ghent Ghent Belgium

关键词： Microassembly Circuit analysis Spectral analysis Time factors Power measurement Electric variables measurement Time measurement Analytical models Circuit simulation Thermal conductivity

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Performance of a rack of liquid-cooled servers

Performance of a rack of liquid-cooled servers

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2007 Winter Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers

作者： Cader, Tahir McAllister, Herley Westra, Levi Regimbal, Kevin Marquez, Andres Government Computing Group Isothermal Systems Research Liberty Lake WA Applied Computer Science Department Computational Sciences and Mathematics Division Pacific North-west National Laboratory Richland WA

Electronics densification is continuing at an unrelenting pace at the server, rack, and facility level. With increasing facility density levels, airflow management has become a major challenge and concern. In an effort to deal with the resulting thermal management challenges, manufacturers are increasingly turning to liquid cooling as a practical solution. The majority of manufacturers have turned to liquid-cooled enclosed racks or rear-door heat exchangers, in which chilled water is delivered to the racks. Some manufacturers are now looking to cold plate cooling solutions that take the heat directly off problem components, such as the CPUs, to get it directly out of the facility. This paper describes work done at the Pacific Northwest National Labs (PNNL) under a Department of Energy-funded program titled "Energy Smart Data Center." An 8.2 kW (27,980 Btu/h) rack of HP rx2600 2U servers has been converted from air-cooling to liquid spray cooling (CPUs only). The rack has been integrated into PNNL's main cluster and subjected to a suite of acceptance tests. Under the testing, the spray-cooled CPUs ran an average of 10°C (18°F) cooler than the air-cooled CPUs. Other peripheral devices, such as the memory D1MMs, ran an average of 8°C (14.4°F) cooler, and the power pod board was measured at 15°C(27°F) cooler. Since installation in July 2005, the rack has been undergoing a one-year uptime and reliability investigation. As part of the investigation, the rack has been subjected to monthly robustness testing and ongoing performance evaluation while running applications such as High Performance Linpack, parts of the NASA NPB-2 Benchmark Suite, and NW Chem. The rack has undergone three months' worth of robustness testing with no major events. Including the robustness testing, the rack uptime is at 95.54% over 299 days. While undergoing application testing, no computational performance differences have been observed between the liquid-cooled and standard air-cooled racks. A sm

关键词： Electronic equipment

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Automated social hierarchy detection through email network analysis

Automated social hierarchy detection through email network a...

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Joint 9th WebKDD and 1st SNA-KDD Workshop 2007 on Web Mining and Social Network Analysis. Held in conjunction with 13th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, KDD 2007

作者： Rowe, Ryan Creamer, German Hershkop, Shlomo Stolfo, Salvatore J. Columbia University Department of Applied Mathematics New York NY 10027 Columbia University Center for Computational Learning Systems New York NY 10027 Columbia University Computer Science Department New York NY 10027

ISBN: (纸本)9781595938480

This paper provides a novel algorithm for automatically extracting social hierarchy data from electronic communication behavior. The algorithm is based on data mining user behaviors to automatically analyze and catalog patterns of communications between entities in a email collection to extract social standing. The advantage to such automatic methods is that they extract relevancy between hierarchy levels and are dynamic over time. We illustrate the algorithms over real world data using the Enron corporation's email archive. The results show great promise when compared to the corporations work chart and judicial proceeding analyzing the major players. Copyright 2007 ACM.

关键词： Hierarchical systems

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Improvement of a retinal blood vessel segmentation method using the Insight Segmentation and Registration Toolkit (ITK)

Improvement of a retinal blood vessel segmentation method us...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： M. Elena Martinez-Perez Alun. D. Hughes Simon A. Thom Kim H. Parker Department of Computer Science Institute of Research in Applied Mathematics and Systems UNAM Mexico Mexico Department of Computer Science Institute of Research in Applied Mathematics and Systems. UNAM México D.F. NHLI Division St Mary's Hospital and Imperial College London UK Department of Bioengineering Imperial College London London UK

We describe an improved implementation of a segmentation method for retinal blood vessels based on a multi- scale approach and region growing employing modules from the Insight Segmentation and Registration Toolkit (ITK). We present the results of segmentation of retinal blood vessels using this improved method and compare these with results obtained using the original implementation in Matlab, as well as with expert manual segmentations obtained from a public database. We show that the ITK implementation achieves high quality segmentations with markedly improved computational efficiency. The ITK version has greater segmentation accuracy, from 0.94 to 0.96, than the Matlab version due to a decrease in FPR values and it is between 8 and 12 times faster than the original version. Furthermore, the ITK implementation is able to segment high-resolution images in an acceptable timescale.

关键词： Retina Blood vessels Image segmentation Biomedical imaging Databases Diabetes Cardiovascular diseases Field programmable gate arrays Testing Kernel

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AAA architectures applied in multi-domain IMS (IP Multimedia Subsystem)

AAA architectures applied in multi-domain IMS (IP Multimedia...

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IEEE Globecom Workshops

作者： W.S. Ooms G. Karagiannis M.O. van Deventer J. Veldhuizen Design and Analysis of Communication Systems Department of Electrical Engineering Mathematics and Computer Science University of Twente Enschede Netherlands Information and Communication Technology Netherlands Organisation for Applied Scientific Research Delft Netherlands

There is a group of communication services that use resources from multiple domains in order to deliver their service. Authorization of the end-user is important for such services, because several domains are involved. There are no current solutions for delivering authentication, authorization and accounting (AAA) to multi-domain services. In our study we present two architectures for the delivery of AAA to such services. The architectures are analyzed on their qualitative aspects. A result of this analysis is that direct interconnection of AAA servers is an effective architectural solution. In current multi-domain IP Multimedia Subsystem (IMS) architectures, direct interconnection of AAA servers, such as the Home Subscriber Servers (HSS), is not yet possible. In this paper we argue and recommend to extend the IMS specification by adding a new interface to HSS in order to support the direct interconnection of HSS/AAA servers located in different IMS administrative domains.

关键词： TV Telephony Authorization Multimedia systems computer architecture mathematics computer science Authentication 3G mobile communication Information security

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Optimisation of the antenna placement for an airport surveillance system

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International Journal of Mobile Network Design and Innovation 2007年第3-4期2卷 209-215页

作者： Formella, Arno Aguado-Agelet, Fernando Álvarez-Vázquez, Lino J. Martínez, Aurea Neufeldt, Holger Department of Computer Science University of Vigo Spain Department of Signal Theory and Communications University of Vigo Spain Department of Applied Mathematics University of Vigo Spain Thales ATM Navigation GmbH Air Systems Division Korntal-Münchingen 70825 Germany

We present an optimisation method for the placement of the antennas of a surveillance system on an airport which is based on multilateration. The system takes advantage of a signal sent by an aircraft (for example, SSR Mode S). The measurement error in such a multilateration system is influenced by the Dilution Of Precision (DOP) which reflects the geometry of the surveillance antennas in relation to the position of the aircraft. We derive the mathematical background for the DOP calculation where no timing information is available in the transmitted signal and introduce a gradient free optimisation method to optimise the locations at which to place the antennas. The cost function of the optimisation is based on the distribution of the DOP values in the regions where an aircraft is expected. Further propagation characteristics such as power delay profiles, directions of arrival and received power diagrams, help the engineer to fine tune the design of the system. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Cost functions

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Special Issue on Variable Structure System Control — New Designs and Applications

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Asian Journal of Control 2008年第4期5卷

作者： Prof. Jian-Xin Xu Prof. Leonid Fridman Department of Electrical and Computer Eng. National University of Singapore 4 Engineering Drive 3 Singapore 117576 Tel +65 6874-2566 Fax +65 6779-1103 Dr Jian-Xin Xu received his Bachelor degree from Zhejiang University China in 1982. He attended the University of Tokyo Japan where he received his Master's and Ph.D. degrees in 1986 and 1989 respectively. All his degrees are in Electrical Engineering. He worked for one year in the Hitachi research Laboratory Japan and for more than one year in Ohio State University U.S.A. as a Visiting Scholar. In 1991 he joined the National University of Singapore and is currently an associate professor in the Department of Electrical Engineering. His research interests lie in the fields of learning control variable structure control fuzzy logic control discontinuous signal processing and applications to motion control and process control problems. He is the associate editor of Asian Journal of Control member of TC on variable structure systems and sliding mode control of IEEE Control Systems Society and a senior member of IEEE. He has produced more than 90 peer-refereed journal papers near 160 technical papers in conference proceedings and authored/edited 4 books. Division de Estudios de Posgrado Facultad de Ingenieria National Autonomous University of Mexico DEP-FI UNAM Edificio “A” Circuito Exterior Ciudad Universitaria A. P. 70–256 C.P.04510 Mexico D.F. Mexico Tel +52 55 56223014 Fax +52 55 56161719 Dr. Leonid M. Fridman received his M.S in mathematics from Kuibyshev (Samara) State University Russia Ph.D. in Applied Mathematics from Institute of Control Science (Moscow) and Dr. of Science degrees in Control Science from Moscow State University of Mathematics and Electronics in 1976 1988 and 1998 respectively. In 1976–1999 Dr. Fridman was with the Department of Mathematics at the Samara State Architecture and Civil Engineering Academy Samara Russia. In 2000–2002 he was with the Department of Postgraduate Study and Investigations at the Chihuahu

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Approximating the largest eigenvalue of network adjacency matrices

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Physical Review E 2007年第5期76卷 056119-056119页

作者： Juan G. Restrepo Edward Ott Brian R. Hunt Center for Interdisciplinary Research in Complex Systems Northeastern University Boston Massachusetts 02115 USA Department of Physics Department of Electrical and Computer Engineering and Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742 USA Department of Mathematics and Institute for Physical Science and Technology University of Maryland College Park Maryland 20742 USA

The largest eigenvalue of the adjacency matrix of a network plays an important role in several network processes (e.g., synchronization of oscillators, percolation on directed networks, and linear stability of equilibria of network coupled systems). In this paper we develop approximations to the largest eigenvalue of adjacency matrices and discuss the relationships between these approximations. Numerical experiments on simulated networks are used to test our results.

关键词： COMPLEX NETWORKS RANDOM GRAPHS

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