• Spatial Information Research
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• v.18 no.4
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• pp.65-73
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• 2010

Recently, the importance of the ocean has been increasing internationally as the new source for mineral resources following the exhausted land resources that arc becoming scarce. On a long-term aspect, growth of nations by gaining competitiveness on marine resources was considered a paradigm. Because dominating the development right of marine resources came up as the main concern. South Korea has also been interested in marine resources and this is the reason why massive amounts of marine exploration data arc annually created through surveying and drilling around the Korean Peninsula. but the data has not been systematically managed very well because of its economic costs. Therefore, this research is mainly focused on systematical data managing methods. For Systematical data management. the exploration data is integrated and organized by using XML tables. This can be a systematical data management. because the methods release dependency between data and system, and it also enables to update existing data and renew the data. In the future, the constructed database from this study could definitely contribute to enhancing data management. As well, the developed system in this research can provide various spatial analysis and searching techniques to enable easier data provision of various exploration areas. Furthermore. this will be very useful to extend functions of the system and to adopt other types of DBMS. In addition, the spatial analysis and search function of location based service can be utilized through GIS. and it can support sustainable and systematic management in a long term.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.680-682
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• 1998

오늘날 많은 기업들이 공장 자동화를 위하여 많은 투자를 하고 있는 만큼 ATM/B-ISDN 통신망을 기반으로 한 생산 공정을 자동화함으로써 생산성 향상, 품질향상 및 원가절감을 꽤할 수 있어 오늘날 국제 경쟁 상회에서 유리한 위치를 점유할 수 있다. 본 논문에서는 원격지에 연결괸 공장 자동화 시스템을 중앙통제실에서 제어하는 시스템으로 분산형 데이터베이스를 구축하여 공장 자동화라인의 데이터를 저장, 유지 관리한다. 또한 각 생산 공정 라인의 텍스트, 그래픽, 이미지, 오디오, 비디오 등과 같은 대용량의 멀티미디어 데이터베이스 시스템을 구성하기 위해서는 원격제어을 위한 초고속 통신망이 필요하고,ATM/B-ISDN 통신망을 기반으로 한 멀티미디어 원격제어 구현을 위한 DBMS(Database Management)의 원격제어 Agent 시스템을 구현한다.

• The Journal of Society for e-Business Studies
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• v.4 no.2
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• pp.95-113
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• 1999

Recently, Internet services are rapidly spreading all over the world. Internet will have a great influence on financial market and banking industry. Customers will obtain full banking services over Internet. Thus, Internet banking is an unavoidable choice to strengthen the competitive edge of banks. This paper designs and develops an application for Internet banking services in the existing banks. The implementation of Internet banking requires the construction of website, web pages and links to other related information. Using Oracle DBMS(Database Management System), Oracle Application Server, PL/SQL(Procedural Language/SQL), Java Applet, and Java Script, a prototype for Internet banking is implemented.

• Proceedings of the KIEE Conference
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• 1995.11a
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• pp.563-565
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• 1995

기존의 가상현실(Virtual Reality) 시스템들은 가상세계 (Virtual World)에 관한 데이타를 대부분 파일의 형태로 관리하고 있다. 가상현실에 대한 연구가 진전되어 공유가상세계(Shared Virtual World)를 기반으로 하는 대규모 응용분야가 나타나면서, 데이타의 효율적 관리와 공유를 위한 상위 레벨의 데이타 관리층이 필요하게 되었다. 본 논문에서는 가상세계 데이타의 관리를 위한 객체지향 DBMS(Database Management System)[1]의 사용을 제안한다. 그리고 데이터베이스에 저장된 지속객체 (Persistent Object)[2]를 공유하는 가상현실 응용시 스템의 구조를 연구한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.73-76
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• 2001

다중등급을 갖고 있는 대용량 데이터베이스 환경에서 각 보안등급을 갖고 있는 사용자가 데이터베이스에 접근할 때 확장된 강제적 접근제어(MAC:Mandatory Access Control) 방식과 역한 그래프(Role Graph)를 이용해 하위등급의 사용자가 상위등급의 데이터를 추론하거나 인지하는 데이터 유출을 방지하여 데이터의 무결성(integrity)과 데이터베이스 관리시스템(DBMS:Database Management System) 전체의 보안을 유지하며 각 보안등급의 데이터와 사용자를 효율적으로 관리하고 제어한 수 있는 역할관리 보안모델을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.763-766
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• 2014

플래시 메모리는 입출력 속도가 빠르고 에너지 효율성이 좋지만, out-place update만 가능하며 쓰기 연산을 위한 IO의 지연시간이 읽기 연산보다 현저히 길다는 단점을 가진다. 이를 보완하기 위해 고안된 FlashSSD(Solid State Drive)는 최근 하드 디스크를 대체하는 저장장치로 주목받고 있다. DBMS(Database Management System)의 성능 개선을 위하여 FlashSSD를 활용한 다양한 연구가 진행되었다. 그중 FD-tree를 사용한 인덱스는 좋은 갱신 성능을 보임과 동시에 검색 성능을 보인다. 하지만 FD-tree의 구성 요소 중 하나인 레벨이 하나의 자료구조로만 이루어져 있어 인덱스로서의 비효율성을 가지고 있기 때문에 이를 인덱스의 접근 빈도를 이용하여 개선하고 검색 성능을 높이고자 한다.

• The KIPS Transactions:PartD
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• v.11D no.2
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• pp.317-324
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• 2004

Containment queries for XML documents is one of the most important query types, and thus the efficient support for this type of query is crucial for XML databases. Recently, object-relational database management system (ORDBMS) vendors try to store and retrieve XML data in their products. In this paper, we propose an extensible index to support containment queries over the XML data stored as BLOB type in ORDBMSs. That is, we describe how to implement the index using the extensibility feature of an ORDBMS, and describe its usage.

• KSCI Review
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• v.8 no.2
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• pp.15-23
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• 2001

Due to the popularization of Web. the importance of Web for teachers to collect teaching materials increases, but there are difficulties in using Web. due to the rapid increase of information and the shortage of proper skill of using it. The thesis designs and implements a lesson plan management system that systematically manages diverse data and teachers' knowledge. The information required in preparing lesson plans is acquired on the Web and stored in database, and the lesson plan Produced this way could be shared by other teachers on the Internet. In addition. lesson plan DTD was designed and every lesson Plan was transformed into XML data to Provide more convenient data exchange and diverse forms. so that its application could be extended to other education-related systems.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.3
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• pp.22-30
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• 2008

Recently, protection of personal information is getting more important. Many countries have legislated about the protection of personal information. Now, the protection of relevant personal information is required not for a simple image of enterprises but law obligation. Most databases in enterprises used to store customers' names, addresses and credit card numbers with no exceptions. The personal information about a person is sensitive, and this asset is strategic. Therefore, most enterprises make an effort to preserve personal information safely. If someone, however, hacks password information of DBMS manager, no one can trust this system. Therefore, encryption is required based in order to protect data in the database. Because of database encryption, however, it is the problem of database performance in terms of computation time and the limited SQL query. Thus, we proposed an efficient query method to solve the problem of encrypted data in this paper.

• Journal of KIISE:Databases
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• v.31 no.4
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• pp.432-443
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• 2004

As the XML data has been widely used in the Internet, it is necessary to store and retrieve the XML data by using DBMSs. However, relational DBMSs suffer from the model difference between graph structure of the XML data and table forms in relational databases. We propose an ORDBMS-based DTD-dependent XML data management system Xing. Xing stores XML data in a DTD-dependent form in an object database. Since the object database schema has a graph structure and supports multi-valued attributes, mapping from an XML data model and queries into an object data model and OQLs is a simple problem. For rapid storing of large quantities of the XML data, we use SAX parser with customized Xing-tree which requires a small memory space compared with the DOM-tree. Xing also returns the query result in an XML document form. We have implemented the Xing system on top of UniSQL object-relational DBMS for the validity checking and performance comparison. For XML genome data from GenBank, and experimental evaluation shows that Xing can provide significant performance improvement (maximum 10 times) compared with the relational approach.