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Stochastic Modeling of Dislocation Dynamics and Mesoscale Deformation of Metals

AIP Conference Proceedings 2009年第1期1168卷 1128-1128页

作者： Anter el‐Azab Department of Scientific Computing & Materials Science Graduate Program Florida State University Tallahassee FL 32312 USA

We present a kinetic‐theory framework for dislocation dynamics in deforming crystals and outline the underlying sub‐problems of stress equilibrium, dislocation density evolution and deformation kinematics, as well a...

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On self-organizing feature map (SOFM) formation by direct optimization through a genetic algorithm

On self-organizing feature map (SOFM) formation by direct op...

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8th International Conference on Hybrid Intelligent Systems, HIS 2008

作者： Maia, José Everardo B. Barreto, Guilherme A. Coelho, André L. V. State Univ. of Ceará Department of Statistics and Computing Fortaleza Ceará Brazil Federal Univ. of Ceará Department of Teleinformatics Engineering Fortaleza Ceará Brazil University of Fortaleza Graduate Program in Applied Informatics Fortaleza Ceará Brazil

ISBN: (纸本)9780769533261

This paper examines the formation of self-organizing feature maps (SOFM) by the direct optimization of a cost function through a genetic algorithm (GA). The resulting SOFM is expected to produce simultaneously a topologically correct mapping between input and output spaces and a low quantization error. The proposed approach adopts a cost (fitness) function which is a weighted combination of indices that measure these two aspects of the map quality, specifically, the quantization error and the Pearson correlation coefficient between the corresponding distances in input and output spaces. The resulting maps are compared with those generated by the Kohonen's self-organizing map (SOM) algorithm in terms of the Quantization Error (QE), the Weighted Topological Error (WTE) and the Pearson correlation coefficient (PCC) indices. The experiments show the proposed approach produces better values of the quality indices as well as is more robust to outliers. © 2008 IEEE.

关键词： Self organizing maps

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Women and Technology: Reversing the Trends of Attrition and Obtaining a Balance

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Women's Studies 2008年第3期37卷 173-175页

作者： Leroy, Gondy gondy.leroy@cgu.edu Tolle, Kristin M. Perkins, Linda Assistant Professor School of Information Systems and Technology Claremont Graduate University Claremont California USA Program Manager for Biomedical Computing External Research @ Microsoft Research Redmond Washington USA University Associate Professor and Director of Applied Women''s Studies Claremont Graduate University Claremont California USA

The article discusses various reports published within the issue including one by Louise Soe and Elaine K. Yakura on women's attrition from technical fields of work, and another by Indira Guzman and Jeffrey M. Sta... 详细信息

关键词： WOMEN in technology EQUALITY in the workplace

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On Self-Organizing Feature Map (SOFM) Formation by Direct Optimization Through a Genetic Algorithm

On Self-Organizing Feature Map (SOFM) Formation by Direct Op...

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International Conference on Hybrid Intelligent Systems (HIS)

作者： José Everardo B. Maia Guilherme A. Barreto André L.V. Coelho Department of Teleinformatics Engineering Federal University of Ceará Fortaleza Ceara Brazil Department of Statistics and Computing State Univ. of Ceara Fortaleza Ceara Brazil Department of Statistics and Computing State University of Ceará Fortaleza Ceara Brazil Department of Teleinformatics Engineering Federal Univ. of Ceara Fortaleza Ceara Brazil Graduate Program in Applied Informatics University of Fortaleza Fortaleza Ceara Brazil

This paper examines the formation of self-organizing feature maps (SOFM) by the direct optimization of a cost function through a genetic algorithm (GA). The resulting SOFM is expected to produce simultaneously a topologically correct mapping between input and output spaces and a low quantization error. The proposed approach adopts a cost (fitness) function which is a weighted combination of indices that measure these two aspects of the map quality, specifically, the quantization error and the Pearson correlation coefficient between the corresponding distances in input and output spaces. The resulting maps are compared with those generated by the Kohonen's self-organizing map (SOM) algorithm in terms of the quantization error (QE), the weighted topological error (WTE) and the Pearson correlation coefficient (PCC) indices. The experiments show the proposed approach produces better values of the quality indices as well as is more robust to outliers.

关键词： Gallium Neurons Arrays Genetic algorithms Indexes Optimization Genetics

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An Anisotropic Diffusion Filtering Implementation to Execute in Parallel Distributed Systems

An Anisotropic Diffusion Filtering Implementation to Execute...

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IEEE International Conference on Computational Science and Engineering Workshops (CSEWORKSHOPS)

作者： Antonio C. Sobieranski Leandro Coser M.A.R. Dantas Aldo v. Wangenheim Eros Comunello LAPIX-Image Processing and Graphic Computing Lab The Cyclops Group Federal University of Santa Catarina Brazil LaPeSD-Distributed Systems Research Laboratory Federal University of Santa Catarina Brazil Graduate Program Applied Computer Science Universidade do Vale do Itajaí Brazil

ISBN: (纸本)9780769532578

In this paper, we present a parallelization of a filtering algorithm related to non-linear anisotropic diffusion, used to enhance the performance of an application in a parallel distributed system. The anisotropic diffusion is a well-established technique for image enhancement by means of diffusivity functions, which act as border attenuators. However, it requires a high computational cost when a large amount of data is used. The proposed implementation was parallelized considering both point-to-point and collective communications, adopting the MPI paradigm. Results from both approaches indicate that the proposed algorithm has reached interesting levels of performance (81% and 93% of efficiency, respectively) when compared to the execution of one process in a single computer node. In addition, our results indicate an enhancement of around 21% utilizing the collective communication strategy when compared to point-to-point communication.

关键词： Filtering Magnetic separation Anisotropic magnetoresistance Ions Kernel Maximum likelihood detection Pixel

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DLM: A distributed Large Memory System using remote memory swapping over cluster nodes

DLM: A distributed Large Memory System using remote memory s...

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IEEE International Conference on Cluster computing

作者： Hiroko Midorikawa Motoyoshi Kurokawa Ryutaro Himeno Mitsuhisa Sato Department of Computer and Information Science Seikei University Musashino Tokyo Japan Graduate School of Systems and Information Engineering University of Tsukuba Tennodai Tsukuba Ibaraki Japan Advanced Center of Computing and Communication Wako Saitama Japan Research Program for Computational Science RIKEN Wako Saitama Japan

Emerging 64 bitOSpsilas supply a huge amount of memory address space that is essential for new applications using very large data. It is expected that the memory in connected nodes can be used to store swapped pages efficiently, especially in a dedicated cluster which has a high-speed network such as 10 GbE and Infiniband. In this paper, we propose the distributed large memory system (DLM), which provides very large virtual memory by using remote memory distributed over the nodes in a cluster. The performance of DLM programs using remote memory is compared to ordinary programs using local memory. The results of STREAM, NPB and Himeno benchmarks show that the DLM achieves better performance than other remote paging schemes using a block swap device to access remote memory. In addition to performance, DLM offers the advantages of easy availability and high portability, because it is a user-level software without the need for special hardware. To obtain high performance, the DLM can tune its parameters independently from kernel swap parameters. We also found that DLMpsilas independence of kernel swapping provides more stable behavior.

关键词： Kernel Arrays Memory management Servers Bandwidth Performance evaluation Benchmark testing

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Tag clouds for summarizing web search results 07

Tag clouds for summarizing web search results

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16th International World Wide Web Conference, WWW2007

作者： Kuo, Byron Y.-L. Hentrich, Thomas Good, Benjamin M . Wilkinson, Mark D. ICAPTURE Centre for Cardiovascular and Pulmonary Research University of British Columbia St. Paul.s Hospital Vancouver BC V6Z 1Y6 Canada Computing Science Simon Fraser University Burnaby BC Canada Bioinformatics Graduate Program University of British Columbia Vancouver BC Canada

ISBN: (纸本)1595936548

In this paper, we describe an application, PubCloud that uses tagclouds for the summarization of results from queries over thePubMed database of biomedical literature. PubCloud responds toqueries of this database with tag clouds generated from wordsextracted from the abstracts returned by the query. The results ofa user study comparing the PubCloud tag-cloud summarization ofquery results with the standard result list provided by PubMedindicated that the tag cloud interface is advantageous in presenting descriptive information and in reducing user frustrationbut that it is less effective at the task of enabling users to discoverrelations between concepts.

关键词： Online searching

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Design and Evaluation of a Grid computing Based Architecture for Integrating Heterogeneous IDSs

Design and Evaluation of a Grid Computing Based Architecture...

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IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Paulo F. Silva Carlos B. Westphall Carla M. Westphall Marcos Dias de Assuncao Network and Management Laboratory Post-Graduate Program in Computer Science Federal University of Santa Catarina Florianopolis Brazil Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia

Intrusion detection systems (IDSs) have been substantially improved in recent past. However, network attacks have become more sophisticated and increasingly complex: many of current attacks are coordinated and originated in multiple networks. To detect these attacks, IDSs need to obtain information on network events from multiple networks or administrative domains. This work demonstrates that a Distributed IDS (DIDS) can be composed of existing IDSs, improving the detection of misuses in a multiple network environment. We use a grid middleware for creating a service-based intrusion detection grid. We demonstrate through experimental results that the proposed DIDS allows the integration of heterogeneous existing IDSs and improves the detection of attacks by exploring the synergy between existing IDSs.

关键词： Grid computing Computer architecture Intrusion detection Resource management Laboratories Computer science Electronic mail Middleware Computer network management Engineering management

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Session Based Logging (SBL) for IP-traceback on network forensics

Session Based Logging (SBL) for IP-traceback on network fore...

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2006 International Conference on Security and Management, SAM'06

作者： Demir, Omer Ji, Ping Kim, Jinwoo Graduate Program on Forensics Computing John Jay College of Criminal Justice City University of New York United States

ISBN: (纸本)1601320019

The widely acknowledged problem of reliably identifying the origin of information in cyberspace has been the subject of much research. Due to the nature of the Internet protocol, the source IP can be easily falsified which results in numerous problems including infamous denial of service attacks. The combination of smart devices with powerful processing capabilities once observed only in mainframe computers decades ago and the presence of the Internet which allows communications between all those devices exacerbate the problem. In this paper, we propose a novel technique called Session Based Logging (SBL) for simple and effective IP-Traceback and logging mechanism. SBL is easy to implement and also has significant advantage of saving storage space over previously proposed schemes. Moreover the SBL approach has clear edge under sensitive privacy regulations since it does not need to capture detailed contents of each individual communication session. Experimental results show its potential and ease of execution from free of any agent software installation on the logging machine. The proposed SBL scheme on this paper currently supports only TCP sessions but we believe this approach could be further extended to UDP connections which have many inherent network security problems.

关键词： Internet protocols

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High performance simulations of the cellular Potts model

High performance simulations of the cellular Potts model

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20th International Symposium on High-Performance computing in an Advanced Collaborative Environment, 2006. HPCS 2006

作者： Cercato, Fernando Piccini Mombach, José Carlos M. Cavalheiro, Gerson Geraldo H. Post-Graduate Program on Applied Computing Vale do Rio Dos Sinos University São Leopolde RS Brazil

ISBN: (纸本)0769525822

The lattice cellular Potts model is widely used to represent physical and biological cellular systems. Standard implementations of this model in the literature employ inefficient Monte Carlo protocols to select elements (labels) of the lattice storing the investigated system. Recently, we proposed a new parallel algorithm, the Random Walker algorithm (RW), that can generate speedups from 3 to 10 times in simulations of this model. In this paper we present a distributed implementation of the RW algorithm exploiting parallel architectures. Our tests in a computer cluster show speedups between 5.7 and 15.6 in relation to the distributed standard algorithm. © 2006 IEEE.

关键词： Crystal lattices

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