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데이터 그리드를 위한 효율적인 Peer-to-Peer 기반 복제 정책
오상원(Sang Won Oh),이원주(Won Joo Lee),전창호(Chang Ho Jeon) 대한전자공학회 2008 電子工學會論文誌-CI (Computer and Information) Vol.45 No.2
본 논문에서는 데이터 그리드 시스템의 성능을 향상 시킬 수 있는 Peer-to-Peer 기반의 효율적인 복제 정책을 제안한다. 이 정책은 기존의 데이터 복제정책에 Peer-to-Peer 개념을 추가하여 계층구조로 인한 데이터 전송 제한을 줄인다. 그리고 클라이 언트 계층 노드의 저장장치 일정 부분을 임계구역(critical section)으로 설정하여 데이터 복사본을 저장할 수 있도록 함으로써 클라이언트 계층 노드간의 데이터 복사본 전송과 클라이언트 계층 노드에서 상위 계층의 데이터 복제 서버로 데이터 복사본 전송이 가능하도록 한다. 클라이언트 계층 노드간의 데이터 복사본 전송은 데이터 서버 또는 데이터 복제 서버에서 데이터 복사본을 전송하는 것에 비해 전송시간을 최소화 할 수 있기 때문에 데이터 그리드 시스템의 성능을 높일 수 있다. 본 논문에서는 시뮬레이션을 통하여 제안하는 Peer-to-Peer 기반 데이터 복제 정책이 기존의 복제 정책에 비해 그리드 시스템의 성능을향상시킨다는 것을 보인다. In this paper, we propose an efficient data replication strategy based on Peer-to-Peer which improves the performance of Data Grid system. The key idea of this replication strategy is to add the Peer-to-Peer concept for reducing data transmission restriction caused by hierarchical topology. And, it makes the nodes can store data replica to set a critical section at the storage of client level nodes. Therefore, it is possible to transmit the data replica between client level nodes and from client level nodes to upper data replication server. It is more effective to transmit data replica between client level nodes than transmitting data replica from data server or data replication server with respect to minimize the transmission time. This results in improving the performance of Data Grid system. Through simulation, we show that the proposed data replication strategy based on Peer-to-Peer improves the performance of entire Data Grid environment compared to previous strategies.
조합하중을 받는 CFT기둥-RC무량판 내부접합부의 해석연구
오상원(Oh Sang-Won),송진규(Song Jin-Kyu),송호범(Song Ho-Beom),이철호(Lee Cheol-Ho) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
Flat plate system has many advantages, story height reduction, a term of works shortening and changeableness of space, etc. However structures become a tendency of higher stories. When we use RC column, the size of column grow larger. For this reason the use of CFT column is increasing more and more. But existing study to examine the behavior of CFT column - RC flat plate connection clearly is insufficient and there is a limit to analyse the failure mode of connection through experiment study. Accordingly, this study carried out the nonlinear finite element analysis and variables were top reinforcement ratio in the effective width and gravity load ratio, shearhead length. As a result of analysis moment strength of the connection increased but ductility decreased as the top reinforcement ratio in th effective width increased. And moment strength and ductility of the connection decreased as gravity load ratio decreased. In the case that shearhead length is not more than 0.27m, the effectiveness of shearhead length on the moment strength and ductility of the connection were small relatively to other variables.
김현영 ( Kim Hyung Lee ),이정재 ( Lee Jeong Jae ),김영기 ( Kim Young Ki ),오상원 ( Oh Sang Won ),전효묵 ( Jeon Hyo Mook ) 한국농공학회 1998 韓國農工學會誌 : 전원과 자원 Vol.40 No.3
Cost estimate system will be changed from the prime cost calculation to the historical cost data because the present system has some problems. In this situation, each owner should prepare his own cost estimate system based on the historical cost data. In this study, the standard work items were classified and the criteria of their work amount computation were established for rural improvement projects. And also the historical cost data were collected in all range of rural improvement projects, and the database system, "HICOMS" (HIstorical COst data Management System) was built. In order to test the applicability of the HICOMS, standard work cost and contractor cost were compared. The results by HICOMS showed high significance and it was concluded that the HICOMS could be applicable for the cost estimate of the rural improvement projects. projects.