Dongwon Jeong

Learn More
With active research on Web ontology, various storages and ontology query languages have been introduced. The most representative query language for Web ontology is SPARQL which have been developed by W3C, and most storages are based on relational database. Under such a situation, the necessity of SPARQL-to-SQL translation algorithm development becomes(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)
CDN does not calculate connections between infra networks and user networks by increasing physical network. Instead, CDN decentralizes bottlenecked data traffics or contents to main parts of Internet network. By this, an amount of traffics passing through middle-mile of complicated Internet is decreased and CP (contents provider)'s server loads are reduced(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)
In this paper, we take a rather different approach. We explore how to support security models for XML documents by leveraging on techniques developed for relational databases. More specifically, in our approach, (1) Users make XML queries against the given XML view/schema, (2) Access controls for XML data are specified in the relational database (3) Data(More)
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 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 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)
Graph pattern is the key body of a SPARQL query. Prevalent SPARQL query treatment delivers queries to OWL ontology model directly. To obtain inference results, the graph pattern are matched with inference ontology model which is generated by ontology inference engine. Since an inference model occupies much larger space than original model, and can not be(More)
This paper proposes a semantic management framework providing the ubiquitous application field-independent interoperability. The goal of the proposed framework is to provide a consistent and independent semantic usability to ubiquitous applications. The proposed framework uses the merits of the metadata registry that has been developed for exchanging and(More)