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In order to effectively handle the growing amount of available RDF data, a scalable and flexible RDF data processing framework is needed. We previously proposed a Hadoop-based framework, which takes advantages of scalable and fault-tolerant distributed processing technologies, originally proposed as Google's distributed file system and MapReduce parallel(More)
SUMMARY Many production Grid and e-Science infrastructures have begun to offer services to end-users during the past several years with an increasing number of scientific applications that require access to a wide variety of resources and services in multiple Grids. Therefore, the Grid Interoperation Now—Community Group of the Open Grid Forum—organizes and(More)
This practices and experience paper describes the coordination, design, implementation, availability, and performance of the Pacific Rim Applications and Grid Middleware Assembly (PRAGMA) grid testbed. Applications in high-energy physics, genome annotation, quantum computational chemistry, wildfire simulation, and protein sequence alignment have driven the(More)
—As the Earth's ecosystem is a spatially and temporally complex system by nature, it is not sufficient to observe such events and phenomena locally; problems must be solved on a global scale. Therefore, the accumulation of knowledge about the earth in various forms and a scientifically correct understanding of the earth are necessary. The authors have been(More)
Recent advances in grid infrastructure and middleware development have enabled various types of applications in science and engineering to be deployed on the grid. The characteristics of these applications and the diverse infrastructure and middleware solutions developed, utilized or adapted by PRAGMA member institutes are summarized. The applications(More)
The use of RDF (Resource Description Framework) data is a cornerstone of the Semantic Web. RDF data embedded in Web pages may be indexed using semantic search engines, however, RDF data is often stored in databases, accessible via Web Services using the SPARQL query language for RDF, which form part of the Deep Web which is not accessible using search(More)
The computational Grid can offer users tremendous computer resources. Many researchers are developing the Grid middleware and the typical results are Grid RPCs. However, application models are restricted to use when Grid RPCs are applied. In this paper, we proposed the " EVOLVE/G " system for developer to construct evolutionary computation (EC) system on(More)
Performance assurance has become an important aspect in grid and cloud computing which provide services over the Internet, and Service Level Agreements (SLA) are frequently contracted between users and the service providers. However, the I/O performance of the storage or data access service is still provided on a best effort basis. Some distributed storage(More)
A task parallel application is implemented with Ninf-G, a GridRPC system. A series of experiments are conducted on the Grid testbed in Asia Pacific for three months. Through tens of long executions, typical fault patterns were collected , and instability of the network throughput was determined to be a major reason of the faults. Several important points(More)