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检索条件"任意字段=Parallel and Distributed Computing, Applications and Technologies, PDCAT 2003 Proceedings"

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Dynamic role and context-based access control for grid applications

Dynamic role and context-based access control for grid appli...

引用

6th International Conference on parallel and distributed computing, applications and technologies (pdcat 2005)

作者： Yao, HB Hu, HP Huang, BH Li, RX Huazhong Univ Sci & Technol Coll Comp Wuhan 430074 Peoples R China

ISBN: (纸本)0769524052

Despite the recent advances in access control approaches applicable to grid computing, there remain issues that impede the development of effective access control for grid applications. Amongst them are the lack of context-based models for access control, and reliance on identity or capability-based access control schemes. In this paper, we propose RCBAC model which extends the RBAC with context constraints. The RCBAC mechanisms dynamically grant and adapt permissions to users based on a set of contextual information collected from the grid environments, while retaining the advantages of RBAC model.

关键词： distributed computer systems

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distributed Task Assignment Methods - A Dynamic Algorithm

Distributed Task Assignment Methods - A Dynamic Algorithm

引用

parallel and distributed computing, applications and technologies, pdcat 2003 proceedings

作者： Min, Fan Zhang, Jun-Yan Li, Wan-Pei Yang, Guo-Wei Coll. of Comp. Sci. and Engineering Univ. Electron. Sci./Technol. China Chengdu 610054 China

ISBN: (纸本)0780378407

We consider task assignment problem in distributed systems. Tasks are chosen by independent processing units (IPUs) which have only the knowledge of: 1, their own situations;and 2, the system's simple feedbacks. We propose a dynamic algorithm with which IPUs can adjust their tasks in an adaptive fashion and in turn help the system getting optimal. This algorithm overcomes an important limitation of previous works, that is, the max reward probability r*≥0.5, and can get much better performance. Algorithm correctness is analyzed by Markov chains. Experiments and comparisons are presented. Reward/penalty dependency, an issue has not been addressed in previous works, is also analyzed. Moreover, this algorithm can also be used to solve the general assignment problem.

关键词： distributed computer systems

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Study of DCOM-Based Simulation Applied in Locomotive & Track Coupling Dynamics

Study of DCOM-Based Simulation Applied in Locomotive & Track...

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parallel and distributed computing, applications and technologies, pdcat 2003 proceedings

作者： Guofu, Ding Inst. Adv. Des./Mfg. Technol. Res. Southwest Jiaotong University Chengdu 610031 China

Locomotive-track coupling dynamical simulation has made good achievements. However, a problem, how to improve the simulating speed when visualization and dynamical computation are considered at the same time, is still not overcome. Here, based on existing success, we present a distributed COM technology, which is used to change the status of the present slow speed simulation. In this paper, at first, the locomotive-track dynamics system is modeled, a resolving formula is discussed, and visualization of the system is given, then the characteristic of the main integration resolving algorithm is analyzed, which is the reason of actuating the DCOM method. Secondly, we divide these resolving equations into several separated module, which is distributed in different resolving machine as a COM, and construct a distributed parallel computing environment, this method effectively reduces the computing load of the main computer and the computing speed is improved, which is the basement of real-time simulation such as virtual dynamical test of locomotive.

关键词： parallel processing systems

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Comparative Study of Two GA Based Task Allocation Models in distributed computing System

Comparative Study of Two GA Based Task Allocation Models in ...

引用

parallel and distributed computing, applications and technologies, pdcat 2003 proceedings

作者： Vidyarthi, Deo Prakash Tripathi, Anil Kumar Sarker, Biplab Kumar Rani, Kirti Department of Computer Science Faculty of Science Banaras Hindu University Varanasi-221005 India Department of Computer Engineering Institute of Technology Banaras Hindu University Varanasi-221005 India Department of Computer Engineering Kobe University Japan Department of Computer Science Rani Durgavati University Jabalpur India

Genetic Algorithm has emerged as a successful tool for optimization problems. Earlier, we proposed a task allocation model to maximize the reliability of distributed computing System(DCS) using genetic algorithm. Our objective, in this work, is to use the same simple genetic algorithm to minimize the turnaround time of the task given to the DCS for execution and then to compare the resultant allocation with the allocation of maximal reliablity as obtained in [2]. Comparisons of both the algorithms are made by illustrated examples and appropriate comments.

关键词： distributed computer systems

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Noah's ark strategy for avoidance of excess convergence by a parallel genetic algorithm with an object-shared space

Noah's ark strategy for avoidance of excess convergence by a...

引用

4th International Conference on parallel and distributed computing, applications and technologies (pdcat 2003)

作者： Iimura, I Ikehata, S Nakayama, S Kagoshima Univ Fac Engn Dept Informat & Comp Sci Kagoshima 8900065 Japan

ISBN: (纸本)0780378407

In a genetic algorithm (GA), the undesirable phenomenon of excess convergence can often occur. Excess convergence is the phenomenon where the diversity of a group is lost. This phenomenon occurs because homogeneous individuals are increased rapidly in the group while evolving or searching. Therefore, crossover loses its function. Once the excess convergence occurs, the search by the GA becomes meaningless. Therefore, it is important to avoid excess convergence and maintain diversity. First, we show an implementation of a parallel GA based on a multiple-group-type island model, that uses object-shared space. Next, as a simple, effective method for avoiding excess convergence, we propose a diversity maintenance technique based on selection of the homogeneous individuals called the Noah's ark strategy for parallel GAs, and demonstrate its effectiveness on a knapsack problem. Our proposed method is to replace individuals in sub-groups that have excessively converged with the new individuals coming from the search space. That is, we avoid excess convergence by expelling homogeneous individuals, with the exception of one "elite" individual (that we call for Noah). Thus, we limit a decrease in diversity of an entire group.

关键词： genetic algorithm (GA) parallel GA excess convergence object-shared space replicated-worker pattern distributed parallel processing, and knapsack problem

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Multi-agent-oriented modeling for intelligence reconnaissance system

Multi-agent-oriented modeling for intelligence reconnaissanc...

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6th International Conference on parallel and distributed computing, applications and technologies (pdcat 2005)

作者： Li, X Liu, XB Hao, N Acad Armored Force Engn Dept Command Beijing 100072 Peoples R China

ISBN: (纸本)0769524052

To support the advanced concept technology demonstration of intelligence reconnaissance system application on future information battlefield, multi-agent-oriented modeling and simulation technology is applied to set zip the mappings ftom intelligence reconnaissance system's members to respective agents, by which the distributed multi-agent system is designed The established distributed multi-agent system model of intelligence reconnaissance can afford advantage for realizing the simulation of the external, dynamic, complicated and intelligent process.

关键词： distributed computer systems

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A Dynamically Constructed Network Management Architecture and Its Application on Web Services

A Dynamically Constructed Network Management Architecture an...

引用

parallel and distributed computing, applications and technologies, pdcat 2003 proceedings

作者： Zhongzhi, Luan Depei, Qian Xingjun, Zhang Heng, Chen Dept. of Computer Science Xi'an Jiaotong University Xi'an 710049 China Natl. Lab. Software Devmt. Environ. School of Computer Beihang University Beijing 100083 China Comp. Netwk. Mgmt./Active Netwrk. Comp. Netwk./High Perf. Computing

ISBN: (纸本)0780378407

A novel model and architecture of network management-Dynamically Constructed Network Management (DCNM) based on the active network technology is proposed in this paper. The network services and applications are treated as "soft equipment" managed by the NMS thus all the resources in the network can be managed under this model. As the function of managed objects, i.e., network services and applications etc., management functions will be dynamically constructed along with the development and deployment of variety of services and applications in the network. This makes management itself an adaptive component of the network. The architecture of dynamically constructed network management is composed of the management center, the middle management node, the data collection node, and the management client. A DCNM prototype has been developed based on our research experiences. We use this architecture on management of Web services. It makes management itself a Web service.

关键词： distributed computer systems

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Implementing algorithmic skeletons with bulk synchronous parallel ML 18

Implementing algorithmic skeletons with bulk synchronous par...

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18th International Conference on parallel and distributed computing, applications and technologies, pdcat 2017

作者： Loulergue, Frederic School of Informatics Computing and Cyber Systems Northern Arizona University FlagstaffAZ United States

ISBN: (纸本)9781538631515

Skeletal parallelism offers a good trade-off between programming productivity and execution efficiency. In this style of parallelism, an application is a composition of algorithmic skeletons. An algorithmic skeleton captures a pattern of parallel algorithm on a distributed data structure, and is also often associated with a sequential algorithm on a sequential data structure that is the counterpart of the parallel data structure. The algorithmic skeleton approach has been inspired by functional programming. It is therefore very natural to embed algorithmic skeletons in a functional programming language. In this paper we present a new algorithmic skeleton library for the statically typed functional language OCaml, and illustrate its use on some applications. This functional skeletal parallel programming library is implemented using the Bulk Synchronous parallel ML parallel programming library for OCaml. © 2017 IEEE.

关键词： parallel programming

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parallel immune algorithm for lung cancer detection in X-ray images based on object shared space

Parallel immune algorithm for lung cancer detection in X-ray...

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2011 12th International Conference on parallel and distributed computing, applications and technologies, pdcat 2011

作者： Peng, Gang Yang, Xiong Liu, Li Dept. of Computer Science and Technology Huizhou University Huizhou City Guangdong 516007 China

ISBN: (纸本)9780769545646

This paper discusses a parallel immune algorithm (IA) for detection of lung cancer in chest X-ray images based on object shared space. The template matching method is combined to the algorithm and JavaSpaces is used as object shared space. The experiment results show that the algorithm is efficient for detecting suspected lung cancer in chest X-ray images. © 2011 IEEE.

关键词： Diseases

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Multilevel concatenated codes with parallel construction 18

Multilevel concatenated codes with parallel construction

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18th International Conference on parallel and distributed computing, applications and technologies, pdcat 2017

作者： Chang, Hong Ma, Shang-Chih Lee, Chang-Hong Dept. of Electrical Engineering National Taipei University of Technology Taipei Taiwan

ISBN: (纸本)9781538631515

Using the multilevel concatenation, long block codes can be constructed from shorter component codes, resulting in much less decoding complexity. The component codes can also be constructed from multilevel concatenation so that a hierarchical multilevel concatenated structure is built. The decoding complexity of the hierarchical scheme can be further decreased. © 2017 IEEE.

关键词： Concatenated codes

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