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IEEE Conference on Bioinformatics

作者： M. Song S. Boissinot R.M. Haralick I.T. Phillips Department of Computer Science Queen's College Flushing NY USA Department of Biology Queen's College Flushing NY USA Doctoral Program in Computer Science Graduate CenterCity College and Graduate Center City University of New York New York NY USA

We obtain recombination rate distribution functions for all human chromosomes using an optimal quantization method. This nonparametric method allows us to control over-/under-fitting. The piece-wise constant recombination rate distribution functions are convenient to store and retrieve. Our experimental results showed more abrupt distribution functions than two recently published results. In the previous results, the over-/under-fitting issues were not addressed explicitly. Our estimation had greater log likelihood over a previous result using Parzen window. It suggests that the optimal quantization technique might be of great advantage for estimation of other genomic feature distributions.

关键词： Quantization Biological cells Distribution functions Humans computer science Educational institutions Bioinformatics Evolution (biology) Biology Genomics

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Federation Web: a scheme to compound authorization chains on large-scale distributed systems

Federation Web: a scheme to compound authorization chains on...

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Reliable Distributed Systems

作者： A.O. Santin J. da Silva Fraga F. Siqueira E.R. de Mello Graduate Program in Applied Computer Science Exact Sciences and Technology Center Pontifical Catholic University of Paraná Brazil Department of Automation and Systems Federal University of Santa Catarina Brazil Department of Computer Science Federal University of Santa Catarina Brazil

Traditional security systems are not easily scalable and can become single points of failure or performance bottlenecks when used on a large-scale distributed system such as the Internet. This problem occurs also when using a public key infrastructure (PKI) with a hierarchical thrust model. SDSI/SPKI is a PKI that adopts a more scalable trust paradigm, which is focused on the client and based on authorization chains. However, the task of locating the chain that links a client to a server is not completely addressed by SDSI/SPKI. Aiming to overcome this limitation, the paper proposes extensions to the SDSI/SPKI authorization and authentication model. The proposed approach introduces the concept of Federation Webs, which allows the client to build new authorization chains linking it to a server when a direct path does not exist. A prototype implementation of this proposal has shown promising results.

关键词： Authorization Large-scale systems Authentication Internet Scalability computer science Public key Automation computer security Joining processes

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Fuzzy-neuro predictive control, tuned by genetic algorithms, applied to a fermentation process

Fuzzy-neuro predictive control, tuned by genetic algorithms,...

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IEEE International Symposium on Intelligent Control (ISIC)

作者： J.A. Fabro L.V.R. Arruda Automation and Advanced Control Systems Labratory-LASCA Graduate Program on Electrical Engineering and Applied Computer Science-CPGEI Federal Centre of Technological Education of Paraná Curitiba Parana Brazil

This paper proposes the development of a fuzzy predictive control. Genetic algorithms (GA's) are used to automatically tune the controller. A recurrent neural network is used to identify the process, and then provides predictions about the process behavior, based on control actions applied to the system. These predictions are used by the fuzzy controller, in order to accomplish a better control of an alcoholic fermentation process from chemical industry. This problem has been chosen due to its non-linearity and large accommodation time, that make it hard to control by standard controllers. Comparison of performance is made with non-predictive approaches(PID and Fuzzy-PD), and also with another predictive approach, GPC(Generalized Predictive Control).

关键词： Predictive control Genetic algorithms Control systems Fuzzy control Alcoholism Recurrent neural networks Nonlinear control systems Artificial intelligence Biomass Control system synthesis

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Performance issues of bandwidth reservations for grid computing

Performance issues of bandwidth reservations for grid comput...

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International Symposium on computer Architecture and High Performance Computing (SBAC-PAD)

作者： L.-O. Burchard H.-U. Heiss C.A.F. De Rose Communication and Operating Systems Group Technical University Berlin Germany Post-Graduate Program Computer Science Catholic University of Rio Grande do Sul Porto Alegre Brazil

In general, two types of resource reservations in computer networks can be distinguished: immediate reservations which are made in a just-in-time manner and advance reservations which allow to reserve resources a long time before they are actually used. Advance reservations are especially useful for grid computing but also for a variety of other applications that require network quality-of-service, such as content distribution networks or even mobile clients, which need advance reservation to support handovers for streaming video. With the emerged MPLS standard, explicit routing can be implemented also in IP networks, thus overcoming the unpredictable routing behavior which so far prevented the implementation of advance reservation services. The impact of such advance reservation mechanisms on the performance of the network with respect to the amount of admitted requests and the allocated bandwidth has so far not been examined in detail. We show that advance reservations can lead to a reduced performance of the network with respect to both metrics. The analysis of the reasons shows a fragmentation of the network resources. In advance reservation environments, additional new services can be defined such as malleable reservations and can lead to an increased performance of the network. Four strategies for scheduling malleable reservations are presented and compared. The results of the comparisons show that some strategies increase the resource fragmentation and are therefore unsuitable in the considered environment while others lead to a significantly better performance of the network. Besides discussing the performance issue, the software architecture of a management system for advance reservations is presented.

关键词： Bandwidth Grid computing computer networks Application software Quality of service Mobile computing Streaming media Multiprotocol label switching IP networks Software architecture

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Project management model for a physically distributed software development environment

Project management model for a physically distributed softwa...

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Annual Hawaii International Conference on System sciences (HICSS)

作者： R. Zanoni J.L.N. Audy PPGCC Graduate Program in Computer Science Scholarship Holder of DELL/PUCRS E-business Research Center Pontifícal Catolic University of Rio Grande do Sul Porto Alegre Brazil FACIN Computer Science School Pontifícal Catolic University of Rio Grande do Sul Porto Alegre Brazil

The objective of this study is to propose a project management model which includes the unified process (UP) and UML language, for e-business software development in a physically distributed environment. The research is a qualitative study, aiming to develop methods and models. The main research method is the case study, according to Yin (1992). Initial results point towards a model, which includes the spiral life cycle type, the development process of object-oriented systems (using UML specification language and the unified process as proposed by RUP), and the incorporation of the procedural approach proposed by PMBOK (2000). The proposed model is divided into 6 phases, where each one of these phases contains a set of associated activities. In the future, the intention is to develop a support software for the model and apply this software into the environment in study. This extremely important study line demonstrates that the business world and business practices in the software development area are moving ahead of existent theories and conceptual models in this area. This study, yet in its initial phases, starts to bring significant results that contribute to meet market expectations nowadays.

关键词： Project management programming Object oriented modeling Unified modeling language Risk management computer science Application software Costs Productivity Scholarships

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The use of research activities as learning instrument in electrical engineering and computer science graduations

The use of research activities as learning instrument in ele...

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Frontiers in Education (FIE) Conference

作者： C.A.P.S. Martins M.B. Carvalho C.V. Pousa D.O. Penha Computer Science Department and Graduate Program in Electrical Engineering (PPGEE) Computational and Digital System Laboratoty (LSDC) Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil PUC-Minas PPGEE LSDC Belo Horizonte Minas Gerais Brazil Computer Science Department LSDC PUC-Minas Belo Horizonte Minas Gerais Brazil

In this paper we analyze the use of research activities as learning instrument in electrical engineering and computer science. This pedagogic approach was applied in undergraduate disciplines, undergraduate teaching assistance and undergraduate research projects. Our main goals are optimize the learning process using research and motivate the use of research activities as learning instrument.

关键词： Instruments computer science Education Performance analysis Electrical engineering Learning systems Proposals Humans Microprocessors Cache memory

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computer arcwtecture education: application of a new learning method based on design and simulator development

Computer arcwtecture education: application of a new learnin...

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Frontiers in Education (FIE) Conference

作者： C.A.P.S. Martins C.V. Pousa M.B. Carvalho D.O. Penha Carlos Augusto Paiva da Silva Manins Computer Science Depamnent and Graduate Program in Electrical Engineering (PPGEE) Computational and Digital Systems Laboratory (LSDC) Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil Computer Science Depament LSDC PUCMi nas Christiane Vilaga Pousa Belo Horizonte Minas Gerais Brazil Milene Barbora Carvalha PUC-Minas PF'GEE LSDC Belo Horizonte Minas Gerais Brazil

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Optimal grid quantization

Optimal grid quantization

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作者： Mingzhou, Song Haralick, Robert M. Department of Computer Science Queens College of CUNY Flushing NY 11367 Computer Science Doctoral Program Graduate Center of CUNY New York NY 10016

Optimal quantization, a non-parametric technique for pattern recognition, determines a compact and efficient density representation of data by optimizing a global quantizer performance measure, which is a weighted combination of average log likelihood, entropy and correct classification probability. In multi-dimensions, we obtain the quantization grid using genetic algorithms. Smoothing is an important aspect as it affects the generalization ability of the quantizer. We propose a fast k neighborhood smoothing algorithm. Optimal quantization is much more efficient than other non-parametric methods. For not very well separated Gaussian mixture models, it produces much better results than the EM algorithm, which fails to converge to the true parameters of the underlying density. © 2002 IEEE.

关键词： Distributed computer systems

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Human systems integration and advanced technology in engineering department workload and manpower reduction

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NAVAL ENGINEERS JOURNAL 2003年第1期115卷 57-65页

作者： Lively, KA Seman, AJ Kirkpatrick, M KENNETH A. LIVELY graduated from the University of Colorado with a BS in applied mathematics and an MS in mathematics in 1976 and from the Massachusetts Institute of Technology with an MS in electrical engineering and the degree ocean engineer in naval architecture and marine engineering in 1984. He retired from the U.S. Navy in 1989 after 23 years of service. Assignments included electrical officer on the USS Constellation (CV 64) project engineer for the DDG 51 machinery control system (NAVSEA) and DDG 51 Technical Director (NAVSEA). He was vice president of the PDI Division of Bird-Johnson Company from July 1989 to November 1998 where he managed various gas turbine and machinery controls related development projects. He joined Anteon Corporation's Systems Engineering Group as senior controls engineer in December 1998 where he provided technical support to the integrated power systems program (NAVSEA PMS 510) and managed the Office of Naval Research Afloat Laboratory. DR. MARK KIRKPATRICK is currently an independent consultant in human factors and work-load/manning analysis and modeling. He holds a Ph.D. degree in experimental psychology from The Ohio State University and has 34 years of experience in applied human factors. From 1982 through 2000 Dr. Kirkpatrick served as the senior vice president of Carlow International. Prior to joining Carlow in 1982 Dr. Kirkpatrick served as a member of the technical staff at North American Rockwell's Missiles Division and as a project director and vice president for Essex Corporation. His areas of expertise include workload simulation task analysis operator-in-the-loop simulation human performance experimentation statistical analysis and human factors T&E. He has directed and/or participated in human factors projects for the U.S. Navy U.S. Army NASA Department of Transportation the U.S. Nuclear Regulatory Commission and private industry. ANTHONY J. SEMAN III is the technical manager for the reduced ship's crew by virtual presence (RSVP) advanced technology d

Aboard current ships, such as the DDG 51, engineering control and damage control activities are manpower intensive. It is anticipated that, for future combatants, the workload demand arising from operation of systems under conditions of normal steaming and during casualty response will need to be markedly reduced via automated monitoring, autonomous control, and other technology initiatives. Current DDG 51 class ships can be considered as a manpower baseline and under Condition III typical engineering control involves seven to eight watchstanders at manned stations in the Central Control Station, the engine rooms and other machinery spaces. In contrast to this manning level, initiatives such as DD 21 and the integrated engineering plant (IEP) envision a partnership between the operator and the automation system, with more and more of the operator's functions being shifted to the automation system as manning levels decrease. This paper describes some human systems integration studies of workload demand reduction and, consequently, manning reduction that can be achieved due to application of several advanced technology concepts. Advanced system concept studies in relation to workload demand are described and reviewed including. Piecemeal applications of diverse automation and remote control technology concepts to selected high driver tasks in current DDG 51 activities. Development of the reduced ship's crew by virtual presence system that will provide automated monitoring and display to operators of machinery health, compartment conditions, and personnel health. The IEP envisions the machinery control system as a provider of resources that are used by various consumers around the ship. Resource needs and consumer priorities are at all times dependent upon the ship's current mission and the availability of equipment pawnbrokers.

关键词： Naval warfare

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Optimal grid quantization

Optimal grid quantization

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16th International Conference on Pattern Recognition, ICPR 2002

作者： Song, Mingzhou Haralick, Robert M. Department of Computer Science Queens College of CUNY FlushingNY11367 United States Computer Science Doctoral Program Graduate Center of CUNY New YorkNY10016 United States

ISBN: (纸本)0769516963

Optimal quantization, a non-parametric technique for pattern recognition, determines a compact and efficient density representation of data by optimizing a global quantizer performance measure, which is a weighted combination of average log likelihood, entropy and correct classification probability. In multi-dimensions, we obtain the quantization grid using genetic algorithms. Smoothing is an important aspect as it affects the generalization ability of the quantizer. We propose a fast k neighborhood smoothing algorithm. Optimal quantization is much more efficient than other non-parametric methods. For not very welt separated Gaussian mixture models, it produces much better results than the EM algorithm, which fails to converge to the true parameters of the underlying density. © 2002 IEEE.

关键词： Pattern recognition

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