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Proceedings - 2004 IEEE Computational Systems Bioinformatics Conference, CSB 2004

作者： Liu, Dongqing Shi, Ting DiDonato, Joseph A. Carpten, John D. Zhu, Jianping Duan, Zhong-Hui Department of Computer Science University of Akron Akron OH 44325 Department of Cancer Biology Cleveland Clinic Foundation Cleveland OH 44195 Genetic Basis of Hum. Dis. Res. Div. Translational Genom. Res. Institute Tempe AZ 85281 Dept. of Theor. and Appl. Math. University of Akron Akron OH 44325

ISBN: (纸本)0769521940

In this study, we use a genetic algorithm and k-nearest neighbor method to classify two subtypes of renal cell carcinoma using a set of microarray gene expression profiles of nine samples (three clear cell tumors and six papillary tumors). We show that the genetic algorithm/k-nearest neighbor method can be efficiently used in identifying a panel of discriminator genes. To test the robustness of the algorithm, we perform a bootstrapping analysis that removes one sample from the data set at a time and uses the remaining samples for gene selection. We show that each of the removed samples can be classified correctly. We also analyze the stability of the algorithm and the sensitivity of the algorithm with respect to different samples.

关键词： Cells

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Estimation of warranty period for structural components of aircraft

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Aviation 2004年第3期8卷 3-9+41页

作者： Nechval, Nicholas A. Nechval, Konstantin N. Vasermanis, Edgars V. Mathematical Statistics Department University of Latvia Raina Blvd 19 LV-1050Riga Latvia Computer Science Department Inst. Transp. and Telecommunication Lomonosov Street 1 LV-1019 Riga Latvia Dept. of Math. and Computer Science University of Latvia Faculty of Economics and Management University of Latvia

One of the most important problems in fatigue analysis and design of aircraft structures is the prediction of fatigue crack growth in service. Available in-service inspection data for various types of aircraft indicate that the fatigue crack damage accumulation in service involves considerable statistical variability. In this paper, we consider the problem of estimating the minimum time to crack initiation (or warranty period) for a number of aircraft structural components, before which no cracks (that may be detected) in materials occur, based on the results of previous warranty period tests on the structural components in question. This problem is a special case of a general class of problems concerned with the analysis of fatigue crack damage accumulation in aircraft service. The technique proposed here for solving this problem emphasizes pivotal quantities relevant for obtaining ancillary statistics. Attention is restricted to invariant families of distributions. Numerical examples are given.

关键词： Aircraft

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Reconstruction of 2D PET data with monte carlo generated natural pixels

Reconstruction of 2D PET data with monte carlo generated nat...

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2004 2nd IEEE International Symposium on Biomedical Imaging: Macro to Nano

作者： Vandenberghe, S. Byrne, C.L. Soares, E.J. Lemahieu, I. Glick, S. FWO Flanders MEDISIP Ghent University University of Massachusetts Medical School Worcester MA Dept. of Mathematical Sciences University of Massachussetts Lowell Lowell MA Dept. of Math. and Computer Science College of the Holy Cross Worcester MA ELIS Department MEDISIP Ghent University Ghent Belgium Division of Nuclear Medicine University of Massachussetts Medical School Worcester MA

ISBN: (纸本)0780383885

In discrete detector PET, natural pixels are image basis functions calculated from responses of detector pairs. By using reconstruction with natural pixels the discretization of the object into a predefined grid can be avoided. Instead of trying to find the object x from system matrix A and measured data p by solving Ax = p, one solves Mq = AATq = p. The backprojection of the final q results in the estimated image of the object xˆ. In previous work natural pixels were calculated by intersections of strip functions or combinations of strip functions. However, in PET systems the detector response is not correctly described by a strip function. In PET the detector response is better described by a gaussian tube. It is quite difficult to calculate the intersections of all possible Lines Of Response (LOR) in the scanner. This paper proposes an easy and efficient way to generate the matrix M directly by Monte Carlo simulation. Using the natural pixel matrix M has several advantages over using the conventional system matrix A. The discretisation of the object into pixels, which requires an angular dependent projector and backprojector, is avoided. Due to rotational symmetry in the PET scanner the matrix M is block circulant and only the first block row needs to be stored. The block circulant property of the matrix allows use of fast direct methods to calculate the solution. Iterative methods to solve the system are preferred because of numerical stability. ©2004 IEEE.

关键词： Image reconstruction

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Reducing bullwhip effect using delayed generalized predictive control (DGPC)

Reducing bullwhip effect using delayed generalized predictiv...

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2004 IEEE International Conference on Systems, Man and Cybernetics, SMC 2004

作者： Yu, Hongnian Gomma, Hesham Chen, Wende Cang, Shuang Yusuf, Yahaya School of Informatics Bradford University Bradford BD7 1DP United Kingdom Acad. of Math. and System Sciences Chinese Academy of Sciences Beijing China Department of Computer Science University of Wales Aberystwyth SY23 3DB United Kingdom Business School University of Hull Hull HU6 7RX United Kingdom

ISBN: (纸本)0780385667

In supply chains, the phenomenon of bullwhip effect (the variance amplification of order quantities observed in supply chain) has received a considerable attention by both theoretical researchers and practioners as it leads to tremendous losses and poor customer services. This paper introduces a new control engineering technique called delayed generalized predictive control (DGPC) method proposed by one of authors in control of the gas turbine engine. The proposed method can reduce bullwhip effect. This would help the decision makers in supply chains to reduce the negative consequences of the bullwhip effect. © 2004 IEEE.

关键词： Predictive control systems

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Using Web services for dynamically re-purposing reusable online learning resources

Using Web services for dynamically re-purposing reusable onl...

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International Conference on Advanced Learning Technologies (ICALT)

作者： R. Fraser P. Mohan Department of Mathematics and Computer Science The University of the West Indies Saint Augustine USA Dept. of Math. & Comput. Sci. West Indies Univ. St. Augustine Trinidad and Tobago

The IMS content packaging specification provides a framework for deploying learning content based on an XML data structure known as a manifest. A content package is described by metadata and optionally incorporates IMS simple sequencing rules and an IMS learning design, both of which are hard-coded when the package is created. Though these provide some measure of adaptation, the paths through the learning material are pre-determined at design time and it is clear that the current specifications are not robust enough to support the kind of adaptation that caters to the need of all types of learners. In this paper, we propose that Web services can be used to support the dynamic adaptation of content for different learners based on the content packaging specification. We identify the kinds of Web services that would be useful and explain how these services are connected to content packages of reusable online resources. We also discuss the role of pedagogical agents in accessing Web services on behalf of a learner.

关键词： Web services Packaging Assembly XML math.matics computer science Data structures Current measurement Time measurement Robustness

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On the queueing behavior of multiple first-order autoregressive sources

On the queueing behavior of multiple first-order autoregress...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Gang Uk Hwan K. Sohraby Div. of Appl. Math. Korea Adv. Inst. of Sci. & Technol. Taejeon South Korea School of Computing and Engineering Department of Computer Science and Electrical Engineering University of Missouri Kansas City Kansas City MO USA Division of Applied Mathematics Korea Advanced Institute of Science and Technology Yuseong-gu Taejeon South Korea

It is generally believed that the queueing behavior of an arrival process is most sensitive to its first and second order statistics. In this paper, we show that this is not generally true. We consider the queueing behavior of two classes of sources. The first class is the superposition of multiple discrete autoregressive sources of order 1 (referred to as DAR(1) sources), and the second class is a single DAR(1) source having the same first and second order statistics as the superposed source. In particular, we show that in the homogeneous case, the mean queue lengths of the two models are identical, but the queue length variances of the two models are significantly different depending on the correlation of individual sources.

关键词： Random variables Cities and towns Statistics math.matical model Equations math.matics computer science Teleconferencing Traffic control Steady-state

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Identifying a type of Markov chain via observation of two neighboring states

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Journal of Natural science of Hunan Normal University 2004年第3期27卷 12-16页

作者： Xiang, Xu-Yan Deng, Ying-Chun Department of Mathematics Coll. of Math. and Computer Science Hunan Normal University Changsha 410081 Department of Mathematics Hunan University of Arts and Science Changde 415000 China

We prove that all transition rates with respect to reversible cyclic Markov chains with continuous time are uniquely determined by the distributions of their hitting time and sojourn time at two neighboring states. As a result, we can estimate all the statistical characteristics based upon the statistics of the hitting time and sojourn time. As an example, we give its applications to modelling of ion channels in biology.

关键词： Markov processes

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Unsupervised segmentation of the POL-SAR image using similarity parameters in sequential projection pursuit model

Unsupervised segmentation of the POL-SAR image using similar...

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International Conference on Signal Processing Proceedings (ICSP)

作者： Wei Lin Zheng Tian Xian-bin Wen Fan He Northwestern Polytechnical University Xi'an Shaanxi CN Dept. of Math. & Inf. Sci. Northwestern Polytech. Univ. Xi'an China Department of Computer Science and Technology Northwestern Polytechnical University Xi'an China Department of Mathematics and Information Science Northwestern Polytechnical University Xi'an China

A sequential projection pursuit model (SPPM) for unsupervised segmentation of the polarimetric synthetic aperture radar (POL-SAR) image is proposed in this paper. The features of the high dimension data are extracted out via orthogonal projection and the classification is accomplished by the Bayesian decision rule. Also the similarity parameters of POL-data are expressed as the characters of a target and form new target data. The SPPM utilizes new target data to classify the target into various subclasses. Good-segmented results have been obtained for the POL-SAR image processing. The segmented results using the SPPM are better than that of using entropy-alpha plane.

关键词： Image segmentation Radar scattering Scattering parameters math.matical model Remote sensing Radar imaging Statistical distributions Reflection Entropy Vectors

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Approximate reflectional symmetries of fuzzy objects with an application in model-based object recognition

Approximate reflectional symmetries of fuzzy objects with an...

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作者： Colliot, Olivier Tuzikov, Alexander V. Cesar, Roberto M. Bloch, Isabelle Département TSI Ecl. Natl. Sup. des Telecom. CNRS UMR S141 LTCI 46 rue Barrault 75634 Paris Cedex 13 France U. Institute of Informatics Problems Natl. Academy of Sciences of Belarus Surganova 6 220012 Minsk Belarus Department of Computer Science Inst. of Math. and Statistics - IME University of São Paulo USP Rua do Matão 1010 S. Paulo SP CEP 05508-090 Brazil

This paper is devoted to the study of reflectional symmetries of fuzzy objects. We introduce a symmetry measure which defines the degree of symmetry of an object with respect to a given plane. It is computed by measuring the similarity between the original object and its reflection. The choice of an appropriate measure of comparison is based on the desired properties of the symmetry measure. Then, an algorithm for computing the symmetry plane of fuzzy objects is proposed. This is done using an optimization technique in the space of plane parameters. Finally, we illustrate our approach with an application where the symmetry measure is used as an attribute in graph matching for model-based object recognition. © 2003 Elsevier B.V. All rights reserved.

关键词： Fuzzy sets

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Fuzzy reference gain-scheduling approach as intelligent agents: FRGS agent

Fuzzy reference gain-scheduling approach as intelligent agen...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： J.E. Araujo K.H. Kienitz A. Sandri J.D.S. da Silva Integration and Testing Laboratory - LIT São José dos Campos SP BRAZIL Department of Electronics Engineering Instituto Tecnológico de Aeronáutica - ITA São José dos Campos SP BRAZIL Computer Sci. and Applied Math. Associated Lab - LAC Instituto Nacional de Pesquisas Espaciais - INPE São José dos Campos SP BRAZIL

Goal driven intelligent agents and fuzzy reference gain-scheduling (FRGS) approach are described As interchangeable concepts that are able to deal with dynamic complex problems. It is advocated that the FRGS approach may be viewed as an autonomous goal-based agent, that is, a fuzzy logic based agent able to autonomously adapt itself to environmental changes introduced by external inputs. The concept of fuzzy systems and intelligent agent are employed in decision-making problems to lead to a certain degree of autonomy in decision support system. Although the FRGS method was originally proposed for control application, this approach was extended to decision-making tasks due to its ability of emulating human reasoning. This new agent approach uses the external input information also denominated reference (goal) as the driven mechanism to determine the behavior of the system in order to achieve the desired objectives (goal). Thus, the FRGS approach can be modeled in the framework of an adaptive and goal (also context or environment) driven agent.

关键词： Intelligent agent Decision making Humans Control systems Fuzzy logic Fuzzy systems Decision support systems Intelligent systems Knowledge based systems Testing

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