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전자상거래가 유통구조에 미친 영향 - 전자, 자동차산업 중심으로 -
윤용기(Yong-Ku Yoon) 한국인터넷전자상거래학회 2002 인터넷전자상거래연구 Vol.2 No.1
E-commerce has been growing rapidly since the development of the internet and information technology, and this fact has affected the distribution channel of automobiles and electric appliances. For electric goods and automobile industry, which is a manufacturing-centered industry, distribution costs are the major facts that can affect the most to their prices. Adopting the Internet can cure inefficiency of the existing distribution channels. On the other hand, adopting the Internet can also cause the conflicts with the existing distribution channels. In this article, the distribution channels of electric goods and automobile industry would be compared based on on-line and off-line to figure out a factor of conflicts between distribution channels, and presents the proper solutions. This solution would provide cost-savings to the manufacturers and would give the customers chances to consume the cheaper goods. The solutions in this article would not only minimize the conflicts between the distribution channels due to the Internet and e-commerce, but also improve the distribution channels. In this way, the finns can integrate the capacity of inside factors and furthermore, they can have the enough ability to consider the outside factors to extent their sales and minimize the costs. Finally, this would be the basis of an efficient business management.
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.
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.
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),김창훈(Chang-Hoon Kim),김용규(Yong-Kyu Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
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 test results of train movements algorithms using a simulator.