• Journal of KIISE:Computing Practices and Letters
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• v.14 no.2
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• pp.130-142
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• 2008

Different from other ontology languages, TopicMap is capable of integrating numerous amount of heterogenous information resources using the locational information without any information transformation. Although many conventional editors have been developed for topic maps, they are standalone-type only for writing XTM documents. As a result, these tools request too much time for handling large-scale data and provoke practical problems to integrate with legacy systems which are mostly based on relational database. In this paper, we model a large-scale topic map structure based on XTM 1.0 into RDB structure to minimize the processing time and build up the ontology in legacy systems. We implement a topic map platform called X-TOP that can enhance the efficiency of ontology construction and provide interoperability between XTM documents and database. Moreover, we can use conventional SQL tools and other application development tools for topic map construction in X-TOP. The X-TOP is implemented to have 3-tier architecture to support flexible user interfaces and diverse DBMS. This paper shows the usability of X-TOP by means of the comparison with conventional tools and the application to healthcare cancer ontology management.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.17-22
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• 2007

이 논문에서는 관계형 데이터베이스 모델 기반의 OWL 웹 온톨로지 모델을 보이고 이에 대한 실험 및 비교 평가 결과에 대하여 기술한다. OWL은 W3C에 의해 2004년 12월에 권고안으로 채택된 이후에 많은 연구가 진행되고 있다. 편집 도구 개발, 저장소 개발로 OWL 기반의 추론 엔진까지 이와 관련된 다양한 연구가 진행 중이다. 특히 OWL 온톨로지의 영구적인 저장 및 관리를 위해 관계형 데이터베이스 모델을 이용한 많은 연구 결과들이 발표되고 있다. 이 논문에서는 널리 알려진 관계형 모델 기반의 저장소 보다 나은 성능을 제공하기 위해 제안한 모델에 대한 평가 결과에 대하여 기술한다. 기존 유사 연구의 경우, 비교 평가를 위한 평가 항목으로 온톨로지 로드 시간을 고려하기도 하지만 이 논문에서는 질의응답 시간에만 초점을 둔다. 이는 매우 특수한 상황을 제외한 대부분의 상황에서 질의 처리 시간이 가장 중요한 요소이며 실질적인 활용성 측면에서 핵심적으로 다루어야 하는 평가 항목이기 때문이다. 실험을 위한 데이터로서는 많은 연구에서 활용하고 있는 LUBM 데이터 셋을 이용하며 실험 대상으로는 오픈 소스이며 널리 알려진 시스템인 Jena의 저장소와 Sesame를 이용한다. 실험 및 비교 평가 결과, 제안 시스템이 비교 대상 시스템들에 비해 나은 성능을 보임을 알 수 있다.

• Journal of the Korea Society of Computer and Information
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• v.14 no.1
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• pp.191-203
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• 2009

To provide dynamic services for users in ubiquitous computing environments by considering context in real-time, in our previous work we proposed Metaservice concept, the description specification and the process for building a Metaservice library. However, our previous process generates separated models - UML, OWL, OWL-S based models - from each step, so it did not provide the established method for translation between models. Moreover, it premises aid of experts in various ontology languages, ontology editing tools and the proposed Metaservice specification. In this paper, we design the translation process from domain ontology in OWL to Metaservice Library in OWL-S and develop a visual tool in order to enable non-experts to generate consistent models and to construct a Metaservice library. The purpose of the Metaservice Library translation process is to maintain consistency in all models and to automatically generate OWL-S code for Metaservice library by integrating existing OWL model and Metaservice model.

• Journal of Korean Society of Archives and Records Management
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• v.18 no.2
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• pp.189-214
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• 2018

Archival description is considered as a creation and curation process, and the results of the descriptive records can be used for archival information service. Therefore, various archival descriptive standards provide essential guidelines for establishing a semantic and synthetic structure of the archival records. In this study, the structural aspects of the archival descriptive standards were analyzed and an experimental mapping between General International Standard Archival Description (ISAD(G)), the archival standard, and CIDOC Conceptual Reference Model (CIDOC CRM), the domain ontology of cultural heritage field was performed. The data structure of ISAD(G) is examined in advance and mapping was performed using Karma as a platform. It was thus concluded that there is a need to understand the ontology-based mapping method and the event-focused domain ontology. Moreover, developing a CIDOC CRM-compatible archival ontology and restructuring the legacy ISAD(G) are needed.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.9
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• pp.637-648
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• 2009

As the cost of disks decreases, PCs are soon expected to be equipped with a disk of 1TB or more. Assuming that a single person generates 1GB of data per month, 1TB is enough to store data for the entire lifetime of a person. This has lead to the growth of researches on lifelog management, which manages what people see and listen to in everyday life. Although many different lifelog management systems have been proposed, including those based on the relational data model, based on ontology, and based on file systems, they have all advantages and disadvantages: Those based on the relational data model provide good query processing performance but they do not support complex queries properly; Those based on ontology handle more complex queries but their performances are not satisfactory: Those based on file systems support only keyword queries. Moreover, these systems are lack of support for lifelog group management and do not provide a convenient user interface for modifying and adding tags (metadata) to lifelogs for effective lifelog search. To address these problems, we propose a lifelog management system based on the relational data model. The proposed system models lifelogs by using the relational data model and transforms queries on lifelogs into SQL statements, which results in good query processing performance. It also supports a simplified relationship query that finds a lifelog based on other lifelogs directly related to it, to overcome the disadvantage of not supporting complex queries properly. In addition, the proposed system supports for the management of lifelog groups by providing ways to create, edit, search, play, and share them. Finally, it is equipped with a tagging tool that helps the user to modify and add tags conveniently through the ion of various tags. This paper describes the design and implementation of the proposed system and its various applications.