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위성 DMS에서의 효율적인 유료시청권한 제어에 관한 연구
김승주(Seung-joo Kim),원동호(Dongho Won),한우철(Woo-chul Han),김현주(Hyun-jue Kim) 한국컴퓨터정보학회 2005 韓國컴퓨터情報學會論文誌 Vol.10 No.2
제한수신 시스템이란 송신기에서 스크램블된 신호를 수신측의 수신권한을 받은 가입자만이 방송 프로그램을 시청할 수 있도록 하는 시스템으로 운영의 많은 부분을 가입자들의 시청료에 의존하는 유료 방송에서 필수적으로 사용되는 기술이다. 방송 프로그램과 정당한 가입자를 보호하기 위하여 도입한 제한수신 시스템에서 가장 기본적이자 가장 중요한 사항은 안전하게 키를 관리하고 분배하는 것이다. 본 논문에서는 최근 주목받고 있는 유료 방송 시스템인 위성 DMB에 적합한 효율적인 키 관리 프로토콜을 제안하고, 이를 기존의 제한수신 시스템 모델에 적용하여 위성 DMB에서의 유료시청 권한 제어 시스템을 설계한다. The Conditional Access System is a complete system for ensuring that broadcasting services be accessible to only those who are entitled to receive them. Secure key management and efficient delivery mechanism are very important design factors to this system. In this paper, we propose secure and efficient protocols which would be well fitted to a Pay TV system including the satellite ONIB. Further, by applying our protocol to the existing conditional access system, we propose a new system that properly enables the control of conditional access to the Pay TV in satellite DMB environment.
매입형 영구자석 동기전동기의 인덕턴스 측정법 비교 분석
김승주(Seung-Joo Kim),김철진(Cherl-Jin Kim),이주(Ju Lee) 대한전기학회 2009 전기학회논문지 Vol.58 No.5
The performance analysis and robust control of the interior permanent magnet synchronous motor (IPMSM) greatly depend on accurate value of its parameters. To achieve the high performance of torque control, it is necessary to consider exact inductance values because the inductances are nonlinear parameters of operating the IPMSM. Therefore many different methods have been performed for analysis of the methodology for the exact measurement of synchronous inductances. None of them is considered standard, and accuracy levels of all these methods are also not consistent. Among these experimental methods, the DC current decay test and the vector current control test are ideal for a laboratory environment. In this paper, these two test methods are compared by applying inductances to the IPMSM. The paper analyzes the measured inductances of the two methods and their differences with inductances obtained from the finite element method(FEM).
김승주(Kim, Seung-Joo) 한국형사소송법학회 2017 형사소송 이론과 실무 Vol.9 No.1
Since Criminal Procedure Act and Supreme Court declared the introduction of Exclusionary Rule in 2007, Supreme Court of Korea has accumulated several precedents about this rule in last 10 years. These precedents has shown 3 features ; ① If an investigative s act in the process of acquiring evidence is ruled illegal, this evidence is presumed to be excluded from the pools of evidence irrelevant to the degree of illegality, in principle. ② Exceptionally, some evidences can be admitted through the fair comparison of interests, between the request to keep Due Process and the needs to find Substantial Truth. ③ Due process should be taken seriously for the realization of constitutional civil rights. According to ① or ③ features, Supreme Court has held tight grip about the relevance between the fact of suspicion written on search warrant and the evidence acquired according to this warrant. Including this theme, This article settles the flow of precedents in last 10 years shown at the various, individual cases. Otherwise, precedents related to ② features has been formed especially on the admissibility of secondary evidence, which has been judged with priority given to dilution or disconnection of causality. These precedents show the influence of 「fruit of a poisonous tree」 doctrine or the other exception theories of the United States, as well as the effects of Japanese or German precedents.