• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.589-591
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• 1999

본 논문은 지금까지 환경 정보의 전달방법이 텍스트 위주이며 한정된 장소와 제한된 사람들에게만 보여주었던 것을 Java와 Java 3D를 사용하여 특별한 프로그램 없이 웹상에서 3차원 영상을 볼 수 있도록 한다. 각 지역별 환경 정보를 다양한 방법을 통하여 제공하며 실시간으로 갱신된 정보를 볼 수 있고, 또 축적된 자료를 애니메이션하여 정보의 변화를 볼 수 있다.

• Disaster Prevention Review
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• v.14 no.3
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• pp.38-46
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• 2012

지난해 여름철에는 기상관측 기록을 갱신하는 집중호우에 따른 산사태 많은 인명피해가 발생하고, 저지대 주택 및 도로가 침수되는 등 서민생활 불편이 가중되는 문제가 발생하였다. 따라서, 금년 여름철에는 예상치 못한 집중호우에도 적극 대처할 수 있도록 인명피해 위험지역 특별관리, 하천도로 교통통제 절차 개선, 24시간 상황관리 등 철저한 사전준비를 통해 한층 더 상향된 대응계획을 수립하였다. 여름철 자연재난 대책의 주요내용은 다음과 같다.

• Journal of KIISE:Software and Applications
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• v.26 no.6
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• pp.780-790
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• 1999

데이터 웨어하우스는 의사결정을 위하여 여러 소스로부터 데이터를 계속 축적하는 저장고로 볼 수 있다. 따라서, 데이터웨어하우스와 지역소스사이의 일관성 유지문제는 데이터 웨어하우스 환경에서 가장 중요한 문제중의 하나로 인식되어 오고 있다. 본 논문에서는 실체 뷰를 기반으로 하는 데이터 웨어하우스 시스템에서 통신지연을 고려한 일관성 유지 알고리즘을 제안한다. 기존의 연구와 달리 제안한 알고리즘은 다중 갱신을 허용하면서도 완전 일관성을 수준을 보장한다.

• Proceedings of the CALSEC Conference
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• 1999.11a
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• pp.579-588
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• 1999

◆ 산업기술정보의 근간이 되는 4개 DB서비스 ◆ 전지역 정보를 통합한 포탈시스템과 지역특화시스템으로 구성 ◆ DB 정보검색(8개) 및 DB 통합검색 ◆ 분야별로 정의된 업체, 지자체의 기업지원뉴스 제공 ◆ Fax, E-mail에 기반한 상품정보 거래알선체제 ◆ 자기정보 등록체제(DB등록과 갱신) ◆ 지자체 파일 공유를 위한 표준화 ◆ DB 및 시스템 이용등에 관한 전문분석 통계체제 ◆ 국내 제조업체, 전문인력, 시험연구장비, 등의 디렉토리 관리 및 로봇검색 체제 (중략)

• The Transactions of the Korea Information Processing Society
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• v.3 no.7
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• pp.1680-1686
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• 1996

The deterministic update method of intensional predicates in a parallel deductive database that deductive database is distributed in a parallel computer architecture in needed. Using updated data from the deterministic update method, a strategy for parallel evaluation of intensional predicates is required. The paper is concerned with an approach to updating parallel deductive database in which very insertion or deletion can be performed in a deterministic way, and an extended parallel semi-naive evaluation algorithm in a parallel computer architecture. After presenting an approach to updating intensional predicates and strategy for parallel evaluation, its implementation is discussed. A parallel deductive database consists of the set of facts being the extensional database and the set of rules being the intensional database. We assume that these sets are distributed in each processor, research how to update intensional predicates and evaluate using the update method. The parallel architecture for the deductive database consists of a set of processors and a message passing network to interconnect these processors.

• Journal of KIISE
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• v.41 no.11
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• pp.967-973
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• 2014

A continuous object is large phenomenon diffusing continuously. Therefore, a large number of sources is a major problem in researches for continuous object. Existing studies for continuous object detecting focus on reducing communication cost generated by the sources. But, they only deal with the static sink located in fixed position. In this paper, we propose the location update scheme for mobile sinks in continuous object detecting. Generally, to receive data, a mobile sink should notice its current location to sources. Previous studies for location update of mobile sinks consider individual object. So they need a lot of energy for location update when a mobile sink notices its current location toward many sources of a continuous object independently. Proposed scheme exploits regional locality of the sources involved one continuous object. The regional locality makes the location update of mobile sinks efficient. Our simulation results show that the proposed scheme superior to existing schemes in terms of energy efficiency.

• Journal of the Korea Society of Computer and Information
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• v.12 no.6
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• pp.235-242
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• 2007

Network Mobility Basic Support protocol reduces location-update signaling by making network movements transparent to the mobile nodes (MNs) behind the mobile router (MR), but causes some problems such as sub-optimal routing and multiple encapsulations. This paper proposes an Route Optimization Employing HMIP Extension for Mobile Networks (ROHMIP) scheme for nested nubile networks support which introduces HMIP concept with relation information between MNNs behind a MR and the MR in order to localize handoff, to optimize routing and especially reduce handoff signal overhead. With ROHMIP, a mobile network node (MNN) behind a MR performs route optimization with a correspondent node (CN) as the MR sends a binding update message (BU) to mobility anchor point (MAP) via root-MR on behalf of all active MNNs when the mobile network moves. This paper describes the new mechanisms and provides simulation results which indicate that our proposal reduces transmission delay, handoff latency and signaling overhead.

• Journal of Korean Society of Forest Science
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• v.101 no.2
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• pp.279-285
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• 2012

This study was conducted to offer preliminary data for forest management from March and December 2011. Based on the number of standing trees by DBH classes, it is recommended to practice thinning and pruning to change the current young stand to mature stand. In Livelihood Environment Forest Protected Areas, young (0-10 years or 0-10 cm DBH) and detected trees need to be removed and selected healthy trees need to be heavily tended. Also, selected trees in age 20-30 (20-30 cm DBH class) need to receive concentrated tending. Since Livelihood Environment Forest Protected Areas had been vulnerable for erosion, the diversity of understory layer is low. In order to diversify deciduous trees, it is recommended to introduce new species and thin and prune existing trees. It is not proper to adapt clear cutting in a short time and should be partially regenerated using shelter-wood method or proper tending practices to the Pinus rigida dominanted forest. Tending existing under-story species including Quercus alina, Quercus variabilis, and Quercus serrata would be important.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.19 no.4
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• pp.357-363
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• 2001

Recently, structure and type of GIS data is various and complicated. Therefore, there is a research on efficient data collecting and processing method. Digital maps and orthophotos are needed for efficient usage in the field of GIS. Digital maps which are one of the part of NGIS and digital cadastral maps are different, and data construction isn't performed. Furthermore, there are no research on the improvement of difference between digital maps and cadastral maps. In this paper, manufactured digital orthophotos using aerial photos are used for change detection in a central area of a town. Selecting a town which has various changes, and digital maps and cadastral maps overlap each other, and analyze them for correction, renovation and possible application.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.25 no.2
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• pp.149-155
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• 2007

Mobile facility management system is a on-site management tool to collect and update various facility data. But there is a chance to make a data inconsistency between lot of concurrent workers. And facility management system requires to keep records about work log within a certain period of time. This paper describes the design and implementation of mobile facility management system, which provide efficient data synchronization mechanism using version managent technique on large facility data in concurrent work environment. And proposed system is able to keep workers update log persistently.