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33rd Annual Frontiers in Education, FIE 2003

作者： Cordeiro, Eduardo Santos Abdanur Stefani, Italo Giovani Do Amaral Pales Soares, Tays Cristina Da Silva Martins, Carlos Augusto Paiva Pontifical Catholic University of Minas Gerais Graduate Program in Computer Science 500 Av. Dom Cabral Coração Eucaristico Belo HarizonteMinas Gerais Brazil Pontifical Catholic University of Minas Gerais Graduate Program in Computer Science Graduate Program in Electrical Engineering 500 Av. Dom Cabral Coração Eucaristico Belo HarizonteMinas Gerais Brazil

ISBN: (纸本)0780379616

We present a functional and structural didactic simulator of Cache Memory Systems developed at the Pontifical Catholic University of Minas Gerais, Brazil. The development occurred during the undergraduate computer Architecture discipline, in the computer science course. Its implementation is one part of a new didactic method, in which developers (students of the computer Architecture discipline) must learn the concepts and theory of the discipline topics to correctly apply them in the simulator. In our simulator, DCMSim, there are features to allow students to construct and verify knowledge, testing and comparing several different configurations and memory access traces. © 2003 IEEE.

关键词： Cache memory

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Helical CT reconstruction from wide cone-beam angle data using ART

Helical CT reconstruction from wide cone-beam angle data usi...

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Brazilian Symposium on computer Graphics and Image Processing (SIBGRAPI)

作者： B.M. Carvalho G.T. Herman Doctoral Program in Computer Science The Graduate Center City College and Graduate Center City University of New York New York NY USA

We report on new results on the use of algebraic reconstruction techniques (ART) for reconstructing from helical cone-beam computerized tomography (CT) data. We investigate two variants of ART for this task: a standard one that considers a single ray in an iterative step and a block version which groups several cone-beam projections when calculating an iterative step. Both algorithms were implemented using modified Kaiser-Bessel window functions, also known as blobs, placed on the body-centered cubic (bcc) grid. The algorithms were used to reconstruct a modified 3D Shepp-Logan phantom from data collected for the PI-geometry for two different maximum cone-beam angles (/spl plusmn/9.46/spl deg/ and /spl plusmn/18.43/spl deg/). Both scattering and quantum noise (for three different noise levels) were introduced to create noisy projections. The results presented here (for both noiseless and noisy data sets) point to the fact that, as opposed to filtered backprojection algorithms, the quality of the reconstructions produced by the ART methods does not suffer from the increase in the cone-beam angle.

关键词： Subspace constraints Image reconstruction Computed tomography X-ray detection X-ray detectors Noise level Object detection Iterative algorithms X-ray imaging Sensor arrays

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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 36

Project management model for a physically distributed softwa...

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36th Annual Hawaii International Conference on System sciences, HICSS 2003

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

ISBN: (纸本)0769518745

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. © 2003 IEEE.

关键词： Project management

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A rule-based XML access control model

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2876卷 35-48页

作者： Anutariya, Chutiporn Chatvichienchai, Somchai Iwiahara, Mizuho Wuwongse, Vilas Kambayashi, Yahiko Computer Science Program Shinawatra University Pathumthani Thailand Department of Social Informatics Graduate School of Informatics Kyoto University Kyoto Japan Computer Science and Information Management Program Asian Institute of Technology Pathumthani Thailand

Due to a widely use of XML language in various application domains, a well-established mechanism for the definition and enforcement of security controls on specific accesses to XML documents is demanded, in order to ensure that only authorized entities can perform certain actions on the protected data. The proposed rule-based, declarative approach supports definition of (possibly implicit and complex) authorization rules on particular nodes within a document as well as enforcement of multiple user-defined policies, specifying selected mechanisms to resolve conflicts or to apply default authorization. Moreover, by founded on both RDF and XDD theory, the developed approach yields a simple yet flexible and interchangeable XML access control model with well-defined declarative semantics. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Access control models

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Possibilities to use the practice of telemedicine in actual technological conditions to remote areas

Possibilities to use the practice of telemedicine in actual ...

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

作者： O.K. Filho M.F. de Amorim Graduate Program in Applied Computer Science Exact Sciences and Technology Center Pontifical Catholic University of Paraná Brazil

One of the main factors that impede the practice of the telemedicine is not the lack of new technologies for the communication, but the lack of studies on the use of the technology already installed in the distant areas, in way to be used of a rational way. The objective of the telemedicine is to provide help to the cares with the health with quality the distant areas of the great attendance centers. Therefore, it cannot ignore the fact that these areas do not make use of point technologies for communication. Then, it is justified the need to accomplish studies that facilitate the practice of the independent telemedicine of the installed technology. Then, the objective of this work is to use as pilot an unit of remote health, contributing with a support system that allows the practice of the telemedicine using the technology of available transmission in the respective place, avoiding that the factor cost is a barrier for the telemedicine projects and can begin an improvement process in the quality of the attendance in units of distant health of the great centers of medical attendance.

关键词： Telemedicine Communications technology Modems Databases computer science Impedance Costs Urban areas Planets Operating systems

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Implementing the multicast Inter-ORB protocol 6

Implementing the multicast Inter-ORB protocol

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6th IEEE International Symposium on Object-Oriented Real-Time Distributed Computing, ISORC 2003

作者： Bessani, A.N. Da Silva Fraga, J. Lung, Lau Cheuk DAS CTC UFSC Campus Universitário Caixa Postal 476 - Trindade FlorianópolisSCCEP 88040-900 Brazil Graduate Program in Applied Computer Science Exact Sciences and Technology Center Pontifical Catholic University of Paraná CuritibaParaná Brazil

ISBN: (纸本)0769519288

This paper presents our experiments for integrating OMG MIOP (Mullicast Inter-ORB Protocol) specifications into a CORBA ORB. We proposed an integration model which allows the coexistence of two different protocol stacks (IIOP/TCP/IP and MIOP/UDP/IP multicast), making possible a large spectrum of middleware support for distributed objects communication. That integration model is discussed in this paper, giving evidence of the compatibility of our approach with the CORBA specifications. We also do some considerations about the implementation of this model in a CORBA compliant ORB. © 2003 IEEE.

关键词： Common object request broker architecture (CORBA)

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Carbon nanotube growth from Cu-Co alloys for field emission applications

Carbon nanotube growth from Cu-Co alloys for field emission ...

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IEEE International Conference on Vacuum Microelectronics (IVMC)

作者： W. Hofmeister W.P. Kang Y.M. Wong J.L. Davidson Interdisciplinary Graduate Program in Material Science Vanderbilt University Nashville TN USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

We have used Cu-Co alloy to generate uniform distribution of Co precipitates, and successfully grown CNTs by CVD on the Cu support.

关键词： Carbon nanotubes Conducting materials Transistors Application software Cobalt alloys Copper alloys Materials science and technology Hydrocarbons Chemical vapor deposition Nanocrystals

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Implementing ITU-T G.723.1 speech coding standard, observation and results

Implementing ITU-T G.723.1 speech coding standard, observati...

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IEEE International Conference on Multi Topic

作者： N.A. Junejo E. Ahmed A. Shah Post Graduate Student Institute of Information Technology Mehran University of Engineering and Technology Jamshoro Pakistan DEAN Department of Computer Science ISRA University Hyderabad Sindh Pakistan

Digital transmission of coded speech is becoming increasingly important in a plethora of voice over internet protocol (VOIP) applications, reaching a variety of platforms, which urges for secure, robust, flexible and platform independent software. ITU-T G.723.1 is a speech compression standard for multimedia communications. G.723.1 is a dual rate codec that compresses the speech signal to 6.3 and 5.3 kbps while maintaining the toll quality and relatively low delay. The major objective of this research is to successfully implement the ITU G.723.1 speech compression standard in Java. The need for implementing this standard in Java was to build a secure, robust, object oriented and platform independent speech coding software, however the delay (execution time) is slightly increased around 10 ms, which may slightly affect the implementation

关键词： Speech coding Internet telephony Robustness Delay Java Application software Communication standards Multimedia communication Speech codecs Software standards

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Estimating recombination rate distribution by optimal quantization

Estimating recombination rate distribution by optimal quanti...

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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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