Open Source Proxy software (OSPS) provides privacy protection for users accessing the Internet by constructing a private anonymizing network. However, there is a growing concern about whether OSPS can actually prevent...
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The existence of redundancy is a serious problem in virtual enterprise in which a number of collaborating enterprises join together to manufacture and sell a class of product for a time-limited period. This paper prop...
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The existence of redundancy is a serious problem in virtual enterprise in which a number of collaborating enterprises join together to manufacture and sell a class of product for a time-limited period. This paper proposes a new approach for detection and elimination of redundancy in virtual enterprises; the proposed approach is based on workflow and uses Petri net for modeling and simulation of workflows. This paper also presents a working example as a proof of concept.
Nowadays, database systems are one of the most popular and essential software programs in computer systems. Many computers are installed a database system and users maybe want to use these database systems as one syst...
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Nowadays, database systems are one of the most popular and essential software programs in computer systems. Many computers are installed a database system and users maybe want to use these database systems as one system. The multi-database system is one of the solutions to this request. The multi-database system is a kind of the distributed database system. It is a cluster of independent database systems. As the distributed database system, the multi-database system has some problems. One of these problems is data migration among individual database systems in the multi-database system. Many reorganization techniques for distributed database systems already proposed. But these techniques are not always adaptive to the data migration in the multidatabase system. In order to overcome this problem, we adapt the incremental scheme to the data migration in the multidatabase system. In our new scheme, a large data migration operation is divided into small ones, and other operations are inserted between them. The experimental result proves the improvement of the turn-around times of other operations.
In this paper, we present a superordinate and subordinate relationship computation method. We have proposed a vector space search method for computing causal relationships. We extend this method to compute directional...
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ISBN:
(纸本)9780889866560
In this paper, we present a superordinate and subordinate relationship computation method. We have proposed a vector space search method for computing causal relationships. We extend this method to compute directionality relationships of superordinate and subordinate concepts. By using general knowledge expression with a tree structure, we generate vector spaces for computing those directionality relationships. This method dealing with the combination of those directionality relationships makes it possible to realize a superordinate and subordinate relationship computation, according to various objectives related to directionality relationships. We have implemented a superordinate and subordinate relationship computing system for directionality relationships among technical terms in the aerospace engineering .eld. We clarify the effectiveness and feasibility of our system by several experiments.
Reputation systems are designed for reducing the risk entailed in interactions among total strangers in electronic marketplaces. Such systems can be used to collect and aggregate feedback on the past behavior of parti...
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Reputation systems are designed for reducing the risk entailed in interactions among total strangers in electronic marketplaces. Such systems can be used to collect and aggregate feedback on the past behavior of participants in electronic transactions, so as to derive reputation scores assumed to predict likely future behavior. Privacy and incentive are mainly concerns in secure reputation systems for feedback providers to providing rating. In this paper, a reputation system is proposed, in which, feedback providers ' privacy can be achieved through anonymous technique by using smart card, incentive for feedback provider to provide rating can be achieved through discount token technique by using hash chain.
Reconfigurable devices, such as field programmable gate arrays (FPGAs), are very popular in today's embedded systems design due to their low-cost, high-performance and flexibility. Partially runtime-reconfigurable...
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Reconfigurable devices, such as field programmable gate arrays (FPGAs), are very popular in today's embedded systems design due to their low-cost, high-performance and flexibility. Partially runtime-reconfigurable (PRTR) FPGAs allow hardware tasks to be placed and removed dynamically at runtime. Hardware task scheduling on PRTR FPGAs brings many challenging issues to traditional real-time scheduling theory, which have not been adequately addressed by the research community compared to software task scheduling on CPUs. In this paper, we consider the schedulability analysis problem of HW task scheduling on PRPR FPGAs. We derive utilization bound tests for two variants of global EDF scheduling, and use synthetic tasksets to compare performance of the tests to existing work and simulation results.
In most of the popular implementation of parallel GAs the whole population is divided into a set of subpopulations, each subpopulation executes GA independently and some individuals are migrated at fixed intervals on ...
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ISBN:
(纸本)9780889867093
In most of the popular implementation of parallel GAs the whole population is divided into a set of subpopulations, each subpopulation executes GA independently and some individuals are migrated at fixed intervals on a ring topology. In these studies, the migrations usually occur 'synchronously' among subpopulations. Therefore, CPUs are not used efficiently and the communication do not occur efficiently either. A few studies tried asynchronous migration but it is hard to implement and to set proper parameter values. The aim of our research is to develop a migration method which is easy to implement, which is easy to set parameter values, and which reduces communication traffic. In our previous research, we proposed Elite Migration on the Server-Client topology and Layered Server-Client topology. In this paper, we consider the effectiveness of Layered Server-Client topology on Large Problem, especially on TSP with 2392 cities.
Users of distributedsystems such as the TeraGrid and Open Science Grid can execute their applications on many different systems. We wish to help such users, or the grid schedulers they use, select where to run applic...
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Users of distributedsystems such as the TeraGrid and Open Science Grid can execute their applications on many different systems. We wish to help such users, or the grid schedulers they use, select where to run applications by providing predictions of when tasks will complete if sent to different systems. We make predictions of file transfer times, batch scheduler queue wait times, and application execution times using historical information and instance-based learning techniques. Our prediction errors for data from the TACC lonestar system are 37 percent of mean file transfer time, 115 percent for mean queue wait time, and 72 percent of mean execution time. Our approach achieves significantly lower prediction error on other workloads. We have wrapped these prediction techniques with Web services, making predictions available to users of distributedsystems as well as tools such as resource brokers and metaschedulers.
Estimation is one of the most important factors in building and designing software. This research to provide a study of the principles of reducing the cost of software and understanding how to apply these techniques t...
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