Young-Kwang Nam

Critical Points for Interactive Schema Matching

Experience suggests that fully automated schema matching is infeasible, especially for n-to-m matches involving semantic functions. It is therefore advisable for a matching algorithm not only to do as much as possible automatically, but also to accurately identify the critical points where user input is maximally useful. Our matching algorithm combines several existing approaches, with a new emphasis on using the context provided by the way elements are embedded in paths. A prototype tested on biological data (gene sequence, DNA, RNA, etc.) and on bibliographic data, shows significant performance improvements from user feedback and context checking. In non-interactive mode on the purchase order schemas, it compares favorably with COMA, the most mature schema matching system in literature, and also correctly identifies critical points for user input.

Converged mobile TV services supporting rich media in cellular and DVB-H systems

Convergence between broadcasting services and telecommunication services and provisioning of rich media services are two major requirements that recent mobile broadcast TV services try to satisfy. Although there exist independent technologies and international standards for each of the requirements, few efforts have been paid for providing solutions supporting these requirements together. In this paper, we present a standard-based implementation for mobile handsets in support of rich media enabled mobile broadcast TV services.

A metadata tool for retrieval from heterogeneous distributed XML documents

A metadata approach for retrieval from heterogeneous distributed XMLdo cuments is given. A prototype system uses distributed metadata to generate a GUI data integration tool, for describing mappings between master and local DTDs, by assigning index numbers and specifying conversion functions. A DDXMI (Distributed Document XML Metadata Interchange) file is generated based on the mappings, and used to translate queries over the virtual master document into sub-queries to local documents. Quilt is the XMLq uery language. An experiment testing feasibility is reported using three bibliography documents. The system runs under NT, using Java servelets and JavaCC.

Standardization of Industrial Information Metadata Based on ISO/IEC 11179

The Industrial Metadata Registry(IMR) for standardizing industrial information metadata was implemented and four drafts of metadata sets were developed based on the ISO/IEC 11179. The IMR consists of four individual metadata registries characterized by subject category. Accordingly, the system includes the integrated administration module, and the divisions administration module. The users of the system are divided into committee members and general users. The system has been developed with Oracle 9i and Java JSP over Linux operating system. The system will support the procedure for data sharing and exchanging among users and organizations and improve the availability and manageability of data and provide the standardization of data across the industry.

Integrated Information Retrieval for Distributed Heterogeneous Ontology Systems

In this paper, we propose a novel system that integrates heterogeneous semantic web systems based on schema mapping. The user can generate only one SPARQL query using the integrated schema without the necessity of checking the schemas of individual systems each time thereby reducing additional costs to generate queries for individual systems. Furthermore, the user is not required to collect individual query results manually after performing a query and additional costs for reestablishing systems can be reduced because no change in existing system structures is required. If currently established systems are expanded by adding the schema structures of other ontology systems, the cost to establish another integrated retrieval system can be saved. To evaluate our approach, we have implemented a prototype that integrates two national information retrieval systems.

Query Optimization with Metadata Routing Tables on Nano-Q+ Sensor Network with Heterogeneous Sensors

In general, data communication among sensor nodes requires more energy than internal processing or sensing activities. In this paper, we propose a noble technique to reduce the number of packet transmissions necessary for query dissemination or query results relaying processes among neighboring nodes with the help of context-aware routing tables. The important information maintained in the context-aware routing table is which physical properties can be measured by descendent nodes reachable from the current node. Based on the information, the node is able to eliminate unnecessary packet transmission by filtering out the child nodes for query dissemination or query results relaying. The simulation results show that up to 80% of performance gains can be achieved with our technique.

Management of Workflow over the Web Supporting Distributed Process Evolution

With the emergence of the Internet, the Web became a widely-used collaboration environment for business process activity. Business process itself is a very evolable entity. In this paper, we introduce a workflow management system called SoftPM/W 2 for the business processes over the Web. For efficient workflow management, SoftPM/W 2 provides integrated formal representation of business process elements, generation of business data model from business process model, a view-based mechanism for distributed evolution, and unique evolution control mechanism.

System for the Researcher Map to Promote Convergence Research

As times change, research methods require dramatic changes such as convergence, innovation of research efforts by institutions with similar research goals. Corporations and universities are currently focusing on the development of convergence technologies. This study focused on the role of universities, which can influence the development of such convergence technologies, and developed a researcher map system that provides information to facilitate academic–industrial collaborations for convergence. The system developed in this paper conducted Morpheme analysis, measured keyword similarity, and performed topic modeling based on the titles, keywords, and abstracts of the papers and projects of researchers in different fields to compare semantically similar topics. The results demonstrated higher accuracy than simply calculating the similarity between words.

iKRISTAL: An integrated information retrieval system using metadata on distributed environments

Abstract Recently, user demands for integrated searches over different information sources have been increasing rapidly. However, it is not easy to seamlessly integrate distributed heterogeneous information retrieval systems. In particular, resolving the discrepancies in the structures and semantics in the databases that are to be integrated is one of the most challenging research issues. In this paper, we propose an iKRISTAL system that integrates distributed, heterogeneous information retrieval systems without requiring source code-level modifications of the participating systems. The key element of our approach to address the structural and semantic discrepancies is to make use of schema mapping and a standardized framework for metadata registry. We have implemented and deployed a prototype implementation that integrates six different information sources, each of which is built upon heterogeneous schemas. Furthermore, we evaluated the performance of our approach under various configurations.

Development of an Integrated Retrieval System on Distributed KRISTAL-2002 Systems with Metadata Information

In this paper, we propose an integrated information retrieval system for multiple KRISTAL-2002 systems for different areas or systems for the same area with the different schemas by using the metadata information so that the users can get the answers by once from the whole systems. Our approach utilizes integrated metadata and mapping information between the metadata and the actual database schema information of participating systems. Therefore, we do not require modification of the participants for integration. We have implemented and deployed the proposed system that integrates six different databases distributed across multiple sites.