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Data grids provide large-scale geographically distributed data resources for data intensive applications such as high energy physics and bioinformatics. Optimizing the use of data resources to maximize the performance is critical for data grids. In this paper, we propose a novel dynamic data replication strategy called FIRE (file reunion), which is motivated by the observations that a group of jobs...
Access control mechanisms are a widely adopted technology for information security. Since access decisions (i.e., permit or deny) on requests are dependent on access control policies, ensuring the correct modeling and implementation of access control policies is crucial for adopting access control mechanisms. To address this issue, we develop a tool, called ACPT (Access Control Policy Testing), that...
Current disk arrays consist purely of hard disk drives, which normally provide huge storage capacities with low cost and high throughput for data-intensive applications. Nevertheless, they have some inherent disadvantages such as long access latencies and energy inefficiency due to their build-in mechanical mechanisms. Flash-memory-based solid state disks, on the other hand, although currently more...
Compared with numerous static file assignment algorithms proposed in the literature, very few investigations on the dynamic file allocation problem have been accomplished. Moreover, none of them has integrated file replication techniques into file assignment algorithms in a highly dynamic file system where files are created or deleted on the fly and their access patterns varied over time. We argue...
Dynamic symbolic execution is a structural testing technique that systematically explores feasible paths of the program under test by running the program with different test inputs to improve code coverage. To address the space-explosion issue in path exploration, we propose a novel approach called Fitnex, a search strategy that uses state-dependent fitness values (computed through a fitness function)...
To improve software productivity and quality, software engineers are increasingly applying data mining algorithms to various software engineering tasks. However, mining SE data poses several challenges. The authors present various algorithms to effectively mine sequences, graphs, and text from such data.
Contemporary disk arrays consist purely of hard disk drives, which normally provide huge storage capacities with low-cost and high-throughput for data-intensive applications. Nevertheless, they have some inhenrent disadvantages such as long access latencies, high annual disk replacement rates, fragile physical characteristics, and energy-inefficiency due to their build-in mechanical and electronic...
With the popularity of service-oriented computing, how to construct highly available service-oriented applications is becoming a hot topic in both the research and industry communities. As a fundamental problem in dynamic service selection, availability estimation is challenging because of the dynamic nature of Web services. To grasp the dynamic nature of Web services, we set up an experimental environment...
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