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2005 ASME Summer Heat Transfer Conference, HT 2005

作者： Erdönmez, Cengiz Saygin, Hasan Institute of Informatics Computational Science and Engineering Program Istanbul Technical University Maslak Istanbul 34469 Turkey Institute of Energy Istabul Technical University Maslak Istanbul 34469 Turkey

ISBN: (纸本)0791847314

The method of fundamental solutions (MFS) is first proposed in 1964 by Kupradze and theoretical basis of this method is constructed at the end of 1980's. As a meshless method, no domain meshing is required for MFS. Fundamental solutions are used to solve problems without coping with the singularity on the boundary because of the fictitious boundary defined containing the domain of the problem. In this paper effectiveness of the MFS will be introduced by two test problem for the homogeneous and inhomogeneous modified helmholtz equations. Inhomogeneous terms are approximated by using the method of particular solutions through the dual reciprocity method. The conduction heat transfer problem is defined and transformed to the corresponding elliptic partial differential equation by using finite difference and the method of lines method which gives an inhomogeneous helmholtz equation. Then the problem is solved iteratively by using the MFS. Two test problem are solved by both the finite element method (FEM) and MFS and compared in the figures. It can be seen that as a meshless method, MFS gives very good results for the test problems. The thermal shock problem presented here also gives accurate solutions by using MFS and agrees well with the FEM solution. Copyright © 2005 by ASME.

关键词： Heat conduction

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Incomplete inverse preconditioners

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ARI Bulletin of the Istanbul Technical University 2005年第3期54卷 48-64页

作者： Alvarado, Fernando Dag, Hasan Department of Electrical and Computer Engineering University of Wisconsin Madison 53706 United States Computational Science and Engineering Program Informatics Institute Istanbul Technical University 34469 Maslak Istanbul Turkey

Incomplete LU factorization is a valuable preconditioning approach for sparse iterative solvers. An "ideal" but inefficient preconditioner for the iterative solution of Ax = b is A-1 itself. This paper describes a preconditioner based on sparse approximations to partitioned representations of A-1, in addition to the results of implementation of the proposed method in a shared memory parallel environment. The partitioned inverses are normally somewhat sparse. Their sparsity can be enhanced with suitable ordering and partitioning algorithms. Sparse approximations to these partitioned inverse representations can be obtained either by discarding selected nonzero entries of these inverses or by precluding the creation of some inversion fills. Experimental results indicate that the use of these partitioned incomplete inverses as preconditioners results in excellent highly parallel preconditioners.

关键词： Conjugate gradient Iterative methods Parallel computation Partitioned inverse method Preconditioner

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Optimal phase-tracking of the nonlinear circadian oscillator

Optimal phase-tracking of the nonlinear circadian oscillator

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2005 American Control Conference, ACC

作者： Bagheri, Neda Stelling, Jörg Doyle III, Francis J. Department of Electrical and Computer Engineering University of California Santa Barbara Santa Barbara CA 93106 United States Institute of Computational Science ETH Zentrum HRS H 28 8092 Zürich Switzerland Department of Chemical Engineering Biomolecular Science and Engineering Program University of California Santa Barbara Santa Barbara CA 93106 United States

Through investigation of transient phase characteristics, a methodology is developed to optimize the phase resetting properties of robust nonlinear biological oscillators;in particular, those of the circadian rhythm. This pacemaker is an autonomous chemical oscillator with a period close to 24 hours. Research in chronobiology indicates that light stimuli can be used to delay or advance the phase of the oscillator, allowing it to synchronize physiological processes and govern daily fluctuations in the core body. This paper proves that a circadian oscillator optimally recovers extreme phase difference (half the nominal period) within 4-days. © 2005 AACC.

关键词： Oscillators (electronic)

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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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Handling missing attribute values in preterm birth data sets

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10th International Conference on Rough Sets, Fuzzy Sets, Data Mining, and Granular Computing, RSFDGrC 2005

作者： Grzymala-Busse, Jerzy W. Goodwin, Linda K. Grzymala-Busse, Witold J. Zheng, Xinqun Department of Electrical Engineering and Computer Science University of Kansas Lawrence KS 66045 United States Institute of Computer Science Polish Academy of Sciences 01-237 Warsaw Poland Nursing Informatics Program Duke University Durham NC 27710 United States Filterlogix Lawrence KS 66049 United States

ISBN: (纸本)3540286608

The objective of our research was to find the best approach to handle missing attribute values in data sets describing preterm birth provided by the Duke University. Five strategies were used for filling in missing attribute values, based on most common values and closest fit for symbolic attributes, averages for numerical attributes, and a special approach to induce only certain rules from specified information using the MLEM2 approach. The final conclusion is that the best strategy was to use the global most common method for symbolic attributes and the global average method for numerical attributes. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Data handling

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Max-product shepard approximation operators 3

Max-product shepard approximation operators

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3rd Serbian-Hungarian Joint Symposium on Intelligent Systems, SISY 2005

作者： Bede, Barnabás Nobuhara, Hajime Fodor, János Hirota, Kaoru Department of Mechanical and System Engineering Bánki Donát Faculty of Mechanical Engineering Budapest Tech Népszinház u. 8 BudapestH-1081 Hungary Department of Computational Intelligence and Systems Science Tokyo Institute of Technology 4259 Nagatsuta Midoriku Yokohama226-8502 Japan Institute of Intelligent Engineering Systems Budapest Tech John von Neumann Faculty of Informatics Budapest Tech Bécsi út 96/b BudapestH-1034 Hungary

In crisp approximation theory the operations that are used are only the usual sum and product of reals. We propose the following problem: are sum and product the only operations that can be used in approximation theory? As an answer to this problem we propose max-product Shepard Approximation operators and we prove that these operators have very similar properties to those provided by the crisp approximation theory. In this sense we obtain uniform approximation theorem of Weierstrass type, and Jackson-type error estimate in approximation by these operators.

关键词： Approximation theory

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Numerical Simulation of Nanopulse Penetration of Biological Matter Using the z -Transform

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Journal of Mathematical Modelling and Algorithms 2005年第1期4卷 99-110页

作者： S. Su W. Dai D. T. Haynie R. Nassar N. Simicevic Ph.D. Program in Computational Analysis and Modeling College of Engineering & Science Louisiana Tech University Ruston USA Mathematics & Statistics College of Engineering & Science Louisiana Tech University Ruston USA Biomedical Engineering College of Engineering & Science Louisiana Tech University Ruston USA Physics College of Engineering & Science Louisiana Tech University Ruston USA Institute for Micromanufacturing College of Engineering & Science Louisiana Tech University Ruston USA

Short duration, fast rise time ultra-wideband (UWB) electromagnetic pulses (“nanopulses”) are generated by numerous electronic devices in use today. Moreover, many new technologies involving nanopulses are under development and expected to become widely available soon. Study of nanopulse bioeffects is needed to probe their useful range in possible biomedical and biotechnological applications, and to ensure human safety. In this work we develop a computational approach to investigate electromagnetic fields in biological cells exposed to nanopulses. The simulation is based on a z-transformation of the electric displacement and a second-order Taylor approximation of a Cole–Cole expression for the frequency dependence of the dielectric properties of tissues, useful for converting from the frequency domain to the time domain. Maxwell’s equations are then calculated using the finite difference time domain method (FDTD), coupled with a perfectly matched layer to eliminate reflections from the boundary. Numerical results for a biological cell model are presented and discussed.

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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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European Signal Processing Conference (EUSIPCO)

作者： Tuba Sirin Mehmet Izzet Saglam Isin Erer Muhittin Gokmen Okan Ersoy Informatics Institute Computer Science and Engineering Informatics Institute Satellite Communication and Remote Sensing Program Faculty of Electrical and Electronic Engineering Electronics and Communication Department Faculty of Electrical and Electronic Engineering Istanbul Technical University Maslak Istanbul TURKEY Purdue University School of Electrical and Computer Engineering West Lafayette Indiana USA

关键词： Image edge detection Image segmentation Vectors Abstracts Filtering algorithms Erbium Training

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Edge detection using clustering algorithms

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WSEAS Transactions on Computers 2005年第5期4卷 417-423页

作者： Sirin, Tuba Saglam, Mehmet Izzet Erer, Isin Gokmen, Muhittin Informatics Institute Advanced Technologies in Engineering Computer Science and Engineering Istanbul Technical University Istanbul 34469 Turkey Informatics Institute Advanced Technologies in Engineering Satellite Communication and Remote Sensing Program Istanbul Technical University Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Electronics and Communication Department Istanbul Technical University Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Computer Engineering Department Istanbul Technical University Istanbul 34469 Turkey

Edge detection is an important topic in image processing and a main tool in pattern recognition and image segmentation. Many edge detection techniques are available in the literature. 'A number of recent edge detectors are multiscale and include three main processing steps: smoothing, differentiation and labeling' (Ziau and Tabbone, 1997). This paper, presents a proposed method which is suitable for edge detection in images. This method is based on the use of the clustering algorithms (Self-Organizing Map (SOM), K-Means) and a gray scale edge detector (Canny, Generalized Edge Detector (GED)). It is shown that using the grayscale edge detectors may miss some parts of the edges which can be found using the proposed method.

关键词： Edge detection

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ICDAR2005 page segmentation competition

ICDAR2005 page segmentation competition

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International Conference on Document Analysis and Recognition

作者： A. Antonacopoulos B. Gatos D. Bridson Pattern Recognition and Image Analysis (PRImA) Research Laboratory School of Computing Science and Engineering University of Sanford Manchester UK Computational Intelligence Laboratory National Center for Scientific Research Demokritos Institute of Informatics and Telecommunications Athens Greece

There is an established need for objective evaluation of layout analysis methods, in realistic circumstances. This paper describes the page segmentation competition (modus operandi, dataset and evaluation criteria) held in the context of ICDAR2005 and presents the results of the evaluation of four candidate methods. The main objective of the competition was to compare the performance of such methods using scanned documents from commonly-occurring publications. The results indicate that although methods seem to be maturing, there is still a considerable need to develop robust methods that deal with everyday documents.

关键词： Image analysis Performance analysis Image segmentation Text analysis Optical character recognition software Pattern recognition Telecommunication computing computational intelligence Laboratories informatics

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