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Appointments for 2005-2006 term

IEEE Transactions on Very Large Scale Integration (VLSI) Systems 2005年第7期13卷 773-782页

作者： Ranganathan, Nagarajan Agrawal, Vishwani D. Chakradhar, Srimat T. Chakrabarty, Krishnendu Courtois, Bernard DeMara, Ronald Hu, Xiaobo Sharon Ismail, Yehea I. Jha, Niraj K. John, Lizy Kurian Ker, Ming-Dou Koren, Israel Liu, Bin-Da Marculescu, Diana Marculescu, Radu Narayanan, Vijaykrishnan Nassif, Sani R. Nowick, Steven M. Sapatnekar, Sachin S. Sherlekar, Sunil Sylvester, Dennis Vemuri, Ranga Pham, Michael Department of Computer Science and Engineering University of South Florida Tampa FL 33620 United States Department of Computer Science and Engineering Nanomaterials and Nanomanufacturing Research Center University of South Florida Tampa United States IEEE United States Systems United States Department of Electrical and Computer Engineering Rutgers University New Brunswick NJ United States IETE India ACM NEC Laboratories America Inc. Princeton NJ United States Duke University Durham NC United States ACM SIGDA Sigma Xi United States Laboratory of Techniques of Informatics and Microelectronics for Computer Architectecture ASME IMAPS IEEE Computer Society University of Central Florida Orlando United States Computer Engineering Program SEECS Department of Computer Science and Engineering University of Notre Dame Notre Dame IN United States Northwestern University Evanston IL United States Department of Electrical Engineering Princeton University Princeton NJ United States Association for Computing Machinery Austin United States UT Austin Engineering Foundation United States Department of Electronics Engineering National Chiao-Tung University Taiwan Department of Electrical and Computer Engineering University of Massachusetts Amherst United States Department of Electrical Engineering Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA United States Electrical and Computer Engineering Faculty Carnegie Mellon University Pittsburgh PA United States Computer Science and Engineering Department Pennsylvania State University University Park United States IBM Austin Research Laboratory Austin TX United States Columbia University New York NY United States Department of Electrical and Computer Engineering University of Minnesota Minneapolis United States Tata Consultancy Services Centre of Excellence for Embedded Systems India Department of Electrical Engineering IIT Bombay India Department of Electrical Engineering Uni

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Finding k disjoint triangles in an arbitrary graph

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30th International Workshop on Graph-Theoretic Concepts in computer Science, WG 2004

作者： Fellows, Mike Heggernes, Pinar Rosamond, Frances Sloper, Christian Telle, Jan Arne School of Electrical Engineering and Computer Science University of Newcastle Australia Department of Informatics University of Bergen Norway

ISBN: (纸本)9783540241324

We consider the NP-complete problem of deciding whether an input graph on n vertices has k vertex-disjoint copies of a fixed graph H. For H = K3 (the triangle) we give an O(22klogk+1.869k n2) algorithm, and for general H an O(2k|H|logk+2k|H|log|H| n|H|) algorithm. We introduce a preprocessing (kernelization) technique based on crown decompositions of an auxiliary graph. For H = K3 this leads to a preprocessing algorithm that reduces an arbitrary input graph of the problem to a graph on O(k3) vertices in polynomial time. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Computational complexity

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A comparative evaluation of competitive learning algorithms for edge detection enhancement

A comparative evaluation of competitive learning algorithms ...

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13th European Signal Processing Conference, EUSIPCO 2005

作者： Sirin, Tuba Saglam, Mehmet Izzet Erer, Isin Gokmen, Muhittin Ersoy, Okan Informatics Institute Advanced Technologies in Engineering Computer Science and Engineering Maslak Istanbul 34469 Turkey Informatics Institute Advanced Technologies in Engineering Satellite Communication and Remote Sensing Program Maslak Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Electronics and Communication Department Maslak Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Computer Engineering Department Istanbul Technical University Maslak Istanbul 34469 Turkey Purdue University School of Electrical and Computer Engineering West Lafayette IN United States

ISBN: (纸本)1604238216

Most edge detection algorithms include three main stages: smoothing, differentiation, and labeling. In this paper, we evaluate the performance of algorithms in which competitive learning is applied first to enhance edges, followed by an edge detector to locate the edges. In this way, more detailed and relatively more unbroken edges can be found as compared to the results when an edge detector is applied alone. The algorithms compared are K-Means, SOM and SOGR for clustering, and Canny and GED for edge detection. Perceptionally, best results were obtained with the GED-SOGR algorithm. The SOGR is also considerably simpler and faster than the SOM algorithm.

关键词： Edge detection

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Spectral consistent satellite image fusion: Using a high resolution panchromatic and low resolution multi-spectral images

Spectral consistent satellite image fusion: Using a high res...

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2005 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2005

作者： Vesteinsson, Ari Sveinsson, Johannes R. Benediktsson, Jon Atli Aanaes, Henrik Department of Electrical and Computer Engineering University of Iceland Hjardarhaga 2-6 107 Reykjavik Iceland Informatics and Mathematical Modelling Technical University of Denmark Denmark

ISBN: (纸本)0780390504

Several widely used methods have been proposed for fusing high resolution panchromatic data and lower resolution multi-channel data. However, many of these methods fail to maintain spectral consistency of the fused high resolution image, which is of high importance to many of the applications based on satellite data. Additionally, most conventional methods are loosely connected to the image forming physics of the satellite image, giving these methods an ad hoc feel. In this paper a new method for image fusion of satellite images is proposed. The method is based on the properties of imaging physics in a statistically meaningful way. Based on our analysis, it is seen, that spectral consistency is a direct consequence of imaging physics and hence guaranteed by our method. This is achieved while exploiting the high resolution single-channel data in what can be seen as a statistical optimal way. This yields a framework to which additional constraints can be added in a straight forward manner. In this work we have exploited this framework and added some simple optimization terms for smoothing the fused image. © 2005 IEEE.

关键词： Sensor data fusion

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Some new algorithms for knowledge discovery in local hypertext corpora

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WSEAS Transactions on Circuits and Systems 2005年第11期4卷 1493-1500页

作者： Vassiliadis, B. Stefani, A. Drossos, L. Ioannou, K. Computer Science Hellenic Open University 13-15 Tsamadou st. GR-26222 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece

The wealth of information available in the internet or local corpora has increased while our ability to search and retrieve relevant information is being reduced. Hypermedia, being complex information objects, are difficult to manage. In this paper we propose some new algorithms for searching and retrieving hypermedia documents from a local server by taking advantage content and context information. Besides presenting new solutions for hypertext, we review the state of the art in multimedia data mining and present future trends in this research area.

关键词： Data mining

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Optical transmitter bandwidth requirements for POF telecom links

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WSEAS Transactions on Circuits and Systems 2005年第11期4卷 1608-1613页

作者： Louvros, S. Ioannou, K. Vassiliadis, B. Drossos, L. Kotsopoulos, S. Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece Computer Science Hellenic Open University 13-15 Tsamadou st. GR-26222 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece

Light emitting diodes (LED) are usually the alternative optoelectronic devices for optical communications with moderate bandwidth efficiency and bit rates, compared to semiconductor lasers. Laser applications dominate the long distance communication networks. However LED seems to be a very good solution, especially in very short distance communication networks, where Plastic Optical Fibers, (POF) are used as the optical transmission medium. This paper investigates a qualitative technique of calculating the bandwidth, based on first principles of semiconductor physics. This technique is more convenient for a first approach of the subject on optical communication networks and its simplicity provides a very useful analytical tool. Finally these results are compared with the existing experimental ones.

关键词： Optical links

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Edge detection in multispectral remote sensing images

Edge detection in multispectral remote sensing images

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RAST 2005 - 2nd International Conference on Recent Advances in Space Technologies

作者： Sirin, Tuba Saglam, Mehmet Izzet Erer, Isin Gökmen, Muhittin Ersoy, Okan Istanbul Technical University Informatics Institute Advanced Technologies in Engineering Maslak/Istanbul Turkey Istanbul Technical University Informatics Institute Satellite Communication and Remote Sensing Program Maslak/Istanbul Turkey Istanbul Technical University Faculty of Electrical and Electronic Engineering Electronics and Communication Department Maslak/Istanbul Turkey Istanbul Technical University Faculty of Electrical and Electronic Engineering Computer Engineering Department Maslak/Istanbul Turkey Purdue University School of Electrical and Computer Engineering West Lafayette IN United States

ISBN: (纸本)0780389778

In this paper, we discuss edge detection by first using a clustering algorithm followed by a known edge detection filter such as Canny or Generalized Edge Detector (GED). We developed a new clustering method called Self-Organizing Global Ranking (SOGR). Comparative results with multispectral satellite images including SOGR, SOM and K-Means clustering methods are discussed. The results show that the two-stage algorithms are better than single stage edge detector algorithms. © 2005 IEEE.

关键词： Edge detection

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The weighted gradient: A color image gradient applied to morphological segmentation

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Journal of the Brazilian computer Society 2005年第3期11卷 53-63页

作者： Flores, Franklin César Polidório, Airton Marco Lotufo, Roberto de Alencar Department of Informatics State University of Maringá Av. Colombo Zona 75790 Maringá PRZip 13081-970 Brazil Department of Computer Engineering and Industrial Automation School of Electrical and Computing Engineering State University of Campinas P.O. Box 6101 CampinasSPZip 13083-852 Brazil

This paper proposes a method for color gradient computation applied to morphological segmentation of color images. The weighted gradient (with weights estimated automatically), proposed in this paper, applied in conjunction with the watershed from markers technique, provides excelent segmentation results, according to a subjective visual criterion. The weighted gradient is computed by linear combination of the gradients from each band of an image under the IHS color space model. The weights to each gradient are estimated by a systematic method that computes the similarity between the image to compute the gradient and an "ideal image", whose histogram has an uniform distribution. Several experiments were done in order to compare the segmentation results provided by the weighted gradient to the results provided by other color space metrics, also according to a subjective criterion, and such comparison is present in this paper. © 2006, The Brazilian computer Society.

关键词： Watersheds

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Providing service standardisation for virtual enterprises

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WSEAS Transactions on Circuits and Systems 2005年第11期4卷 1545-1552页

作者： Vassiliadis, B. Tsaknakis, J. Drossos, L. Sirmakessis, S. Ioannou, K. Internet and Multimedia Technologies Academic Research Computer Technology Institute Patras Greece Computer Science Hellenic Open University 13-15 Tsamadou st. GR-26222 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece

Virtual Enterprises are a, relatively, new business model that is greatly depended on network technology. Providing services in such an environment is a challenge in itself;architectural, technological and organisational difficulties have not permitted yet the development of a framework for Virtual Enterprise enaction. In this paper we describe a Virtual Private Network architecture that uses special monitor and coordination processes in order to achieve efficient delivery of services and activities in Virtual Enterprise environments. We discuss the general architecture of the system, emphasising on the solutions used to monitor and co-ordinate various activities.

关键词： Virtual reality

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A compact mathematical formulation for shared path protection with general shared risk groups

A compact mathematical formulation for shared path protectio...

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2005 International Conference on Wirelessand Optical Communications Networks

作者： Tapolcai, János Ho, Pin-Han Cinkler, Tibor Department of Telecommunications and Media Informatics Budapest University of Technology and Economics Magyar Tudósok könitja 2 Budapest Hungary Department of Electrical and Computer Engineering University of Waterloo Ont. Canada

ISBN: (纸本)0780390199

This paper provides a compact mathematical formulation for shared protection in communication networks with bandwidth guaranteed tunnels. The formulation is characterized by taking the most general definition of the Shared Risk Group (SRG) with the complete routing information in the single failure scenario, which can facilitate solving the Shared Path Protection Problem on various network topologies and various graph models of networks. The general SRGs are essential for survivable routing in multi-layer grooming networks as well as in multi-domain networks. With the formulation, a general approach and a unified expression for solving the dynamic survivable routing problem can be developed. A case study is given at the end to verify the proposed formulation on a well studied special case, namely protecting against a single node or a single link failure. © 2005 IEEE.

关键词： Wireless telecommunication systems

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