Hyun Woong Shin

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Most information retrieval systems, including Web search engines, use similarity ranking algorithms based on a vector space model to find relevant information in response to a user's request. However, the retrieved information is frequently irrelevant, because most of the current information systems employ index terms or other techniques that are variants(More)
The DBMS performance might change by allocating resources and by performing a specific kind of workload. Database administrators should be able to identify relative resources that can change DBMS performance in order to effectively manage database systems. This paper aims to identify the relative resources that can affect the DBMS performance depending on(More)
The rapid growth of on-line information including multimedia contents during the last decade caused a major problem for Web users-there is too much information available, most of it poorly organized and hard to find. To help a user to find proper information, web news search functions are devised and developed. Although those search engines provide some(More)
Most traditional Information Retrieval (IR) systems, including web search engines, operationalize "relevant" as the word frequency in a document of a set of keywords. Because of this limitation, traditional IR systems frequently retrieve irrelevant documents in response to a user’s request. In this paper, we propose a new criterion, "generality," that(More)
The primary goal of this project is to design, develop, deploy, and test methodologies for exploiting semantic aspects of the data. Toward this end, we have developed an information system based on ontologies (collections of key concepts and terms along with their interrelationships) to provide intelligent information selection. The main capabilities of the(More)
The primary goal of this project is to design, develop, and test methodologies for exploiting semantic aspects of the multimedia earthquake science data. The nature of data in the earthquake science domain is full of variety. That is, the interpretations of data differ from resource to resource and scientist to scientist. Therefore, our system must provide(More)
A primary goal of this project is to design, develop, test, enhance, and integrate techniques and mechanisms for specifying the semantic content in units of multimedia information. By the semantic content of a multimedia object O, we refer to the meaning-based categories into which O may be classified, such as " students " , " research projects " , and "(More)