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This paper proposes UbiMDR, a MDR (metadata registry)-based framework for supporting semantic consistency in ubiquitous computing environments. The chief objective of the UbiMDR is to let ubiquitous applications consistently and independently use information of sensors in a variety of sensor fields. Currently, applications depend on their sensor field. In(More)
This paper proposes an enhanced storage model as a plug-in of Jena for semantic grid computing. Semantic grid is built using the technologies of the semantic Web. Jena is one of the most representative frameworks for building semantic Web applications. Jena can be used for building the semantic grid and its applications. It provides a programmatic(More)
This paper performs cost evaluation of storage-independent SPARQL-to-SQL use model. With development of semantic Web, much research focuses on various technologies about Web ontology. Especially, for management and searching of data in Web ontology, various storages based on RDB and query languages (e.g., SPARQL, RDQL, RQL) have been developed with(More)
The existing risk propagation models are limited and inadequate in analyzing cyber attacks caused by various threats in information systems, because it has focus on only a specific threat such as a virus or a worm. Therefore, risk propagation model based on the Markov process is proposed, which can be applied to diverse threats in information systems. The(More)
This paper presents an efficient integration method on metadata of Web resources for realizing the semantic Web. Since the semantic Web must accept and understand all Web information resources that are represented with the other methods, an integration of the metadata has become an issue. Our method treats two representative standardized ontology schemes,(More)
The metadata in the Semantic Grid are described using the technologies of the Semantic Web, such as OWL (OWL Web Ontology Language), and SPARQL has been recommended by W3C. And most metadata including actual data are stored in relational databases. Under such a situation, the necessity of SPARQL-to-SQL translation algorithm development becomes issued for(More)
This paper presents an efficient RFID service framework for supporting semantic consistency. The chief objective of our proposal is to let RFID applications exchange and share information about objects consistently and independently on various application fields (companies/ systems). EPC network can be used for building the RFID service framework. It(More)
With rapid growth of Internet, the amount of information in the Web is increasing exponentially. However, information on the current Web is understandable only for human, and thus it makes the exact information retrieval difficult. For solving this problem, the semantic Web is suggested and we must use ontology languages that can endow data to semantics for(More)
This paper proposes an implementation model for RDF access control in Oracle, and the model is to improve usability of the RAC model, devised for secure resource management for intelligent service frameworks such as semantic Web, semantic grid, semantic GIS, and semantic sensor network. The RAC model has been devised based on the standard relational(More)
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