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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(Yoon Yong-Ki),홍진기(Hong Jin-Ki),김용규(Kim Yong-Kyu) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Train control system is a safety system that protects collision and derailment of trains by maintaining the safe interval between the leading and the subsequent trains. To protect these kinds of accidents, the train control system should conduct functions in a safe and accurate way such as train location detection, movement authority establishment, speed profile framing, and supervision/control for train speed. In general the onboard equipment of TCS detects a train location, after that transmits the information to wayside. The wayside equipment of TCS verifies the train location information and then transmits them to wayside by framing movement authority and static speed profile. The onboard equipment makes out the dynamic speed profile based on the information transmitted from wayside. With this criteria, it supervises and controls the train speed. Therefore, train location detection and movement authority establishment are more important in order to improve reliability and safety of train speed control. In this paper we present the concept design for train location detection and train movement authority settings, the definitions of interfaces and their detailed functionalities. We also propose the scheme for reliability and safety improvement.
FTA(Fault Tree Analysis)를 이용한 철도신호설비 안전기준대상 선정에 관한 연구
윤용기(Yoon Yong-Ki),정락교(Jeong Rag-Gyo),김용규(Kim Yong-Kyu) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Railway signal system is responsible for the safety operation of railway and performs vital functions as safe space control, route control and etc. These functions prevent collision accidents between trains and derailment accidents of trains. However, these accidents are occurred by some causes. It is necessary to analysis hazards, hazard frequency and risk contribution. And railway signal system must make practical application of the analysis results. This paper includes analysis results of railway accident data by FTA(Fault Tree Analysis) and hazards. Railway signal system must consider these hazards. This paper used the railway accident data of RSSB(Railway Safety & Standard Board) of UK. We will use the FTA result to set up a draft of safety criteria of railway signal system.
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.
Smart열차진로제어를 위한 선로데이터 생성관리프로그램의 데이터 구조
윤용기(Yoon Yong-Ki),황종규(Hwang Jong-Gyu),조현정(Jo Hyun-Jeong),이재호(Lee Jae-Ho) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
Even though the existing train route controlling method, using track circuits, ensures the sufficient number of operation, it still has problems such as discordance between train numbers which was planned for operating and train numbers being operated on the track, and allowing only one train entering for one route. To solve those problems, we study and develop the Smart train route controlling system which uses the real-time informations of train positions. This system enables improve the coefficient of utilization in a certain train route controlling section, and the safety level of train route controlling, but we should ensure satisfying reliability of data about tracks operated by trains. In addition, there is a need to protect accidents caused by erroneous information of train position, by reflecting changes of tracks, for example maintenance, improvement, expansion of tracks. In this paper, we describes data structure of a developed program which required to change CAD files to wiring diagrams and to generate them to data of tracks. And we show the result that the simulator, using the data structure, controls speed and route of trains without problems.
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.