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로컬서버와 웹캐싱을 이용한 전자상거래 시스템의 지연속도 개선에 관한 연구
윤용기,고일석,임춘성,Yoon,, Yong-Ki,Ko, Il-Seok,Leem, Choon-Seong 한국정보처리학회 2002 정보처리학회논문지B Vol.9 No.5
전자상거래 사용자와 대용량 멀티미디어 데이터의 증가로 인한 전자상거래 시스템의 급격한 부하 증가와 네트워크 트래픽의 증가는 클라이언트의 요청에 대한 서비스의 지연을 가져와 고객에 대한 고객만족도 감소와 기업의 경쟁력을 떨어뜨리는 요인이 되고 있다. 따라서 전자상거래 시스템의 효율적인 관리와 응답속도를 고려한 연구가 필요하다. 본 연구에서는 전자상거래 시스템의 부하 분산을 위해 캐시 기능을 가진 로컬서버 기반의 계층적 구조의 전자상거래 시스템을 설계하고 로컬 웹서버를 위한 분할된 웹캐시 알고리즘을 제안하며 실험을 통해 성능을 분석하였다. Increasing of electronic commerce users and high-capacity multimedia data is the main causes of increasing of load and network traffic in electronic commerce system. Increasing of load and network traffic brings the delay of service about client's request. And it's becoming factor that decreases customer satisfaction and corporation's competitive ability. So it is needed to research that consider efficient management and response time of electronic commerce system. In this paper, we designed electronic commerce system based on local server with web cashing function in order to solve load problem of electronic commerce system. And we proposed web cashing algorithm for local web server and analyzed performance by an experiment.
윤용기(Yong-Ki Yoon),오세찬(Seh-Chan Oh),이강미(Kang-Mi Lee),조현정(Hyun-Jeong Jo),김용규(Yong-Kyu Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
The development of train control system shall operate a series of processes like system designing, system production and system performance evaluation as a result of various requirements analysis presented in operation rules, operating guidelines for railway organizations etc, notified by the nation. Therefore, considering operation conditions, operation plan, linkage to railway network etc, the major document like system functional specifications, system development specifications, system test plans etc must be drawn up. In this paper we classify system operating scenarios required to prepare for system standard specification and system performance evaluation report of CBTC system for urban subways supporting unmanned automatic operation, and adjust each of the operating status.
Use Case를 활용한 열차제어시스템 기능요구사양서 개발
윤용기(Yong-Ki Yoon),홍진기(Jin-Ki Hong),김용규(Yong-Kyu Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
A train control system(TCS) becomes a large scale and complex as other computer based control systems. So, it is necessary to manage rigorously system requirements specification of the train control system at the early phase. This paper describes Use Cases and activity diagrams of the TCS functions requirements of TCS. Basic functions of the train control system suggested refer to IEC 62290-1. And the basic functions includes train operation without a driver.
윤용기(Yong-Ki Yoon),정락교(Rag-Gyo Jeong),김채덕(Chae-Duck Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
ATS(Automatic Train Stop)s are is effected by track environment, signal distance and train braking distance. So onboard signaling systems such as ATP(Automatic Train Protection) are installed on conventional lines by some train operation companies. With the mixed signalling, the onboard signaling system is overlaid on a conventional line with ATS, it is possible to run the line with conventional trains and ATP trains and to use the advantages of ATP(higher speed or more trains on the line). This paper includes guidelines a mixed signalling(ETCS and ATS) system architecture, operation concepts and infill balise installation.
윤용기(Yong-Ki Yoon),오세찬(Seh-Chan Oh),김민수(Min-Su Kim),김용규(Yong-Kyu Kim),최준영(June-Young Choi),박재영(Jae-Young Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
A Train control system is intended to assure train operation safety and to improve train operation efficiency. To perform these missions the Train Control System consists of train safety space control part train route control part and train operation management part. Train control technology changed from track circuit based to wireless based. And Wireless based train control technologies were developed by some railway signaling companies in Korea. To commercialize these control technologies the development project is carried now. This project did analyze system requirements and made the system development specification. Now this project finished system functions allocation which will be performed by some subsystem. This paper describes roles of each function and the allocation of these functions to each subsystem.