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이병섭,박평주,서명환,Robin Shrestha 한국통신학회 2009 정보와 통신 Vol.26 No.6
본고에서는 위성을 이용하여 WiBro(Wide Broadband)서비스를 제공하는데 있어서 WiBro 신호를 위성중계기를 통해 송수신할 경우, OFDM(Orthogonal Frequency Division Multiplexing) 신호가 갖고 있는 높은 PAPR(Peak-to-Average Power Ratio) 특성으로 인해 발생할 수 있는 전력증폭기의 비선형왜곡 현상에 대해서 기술하였다. 그리고 이를 효과적으로 극복할 수 있는 여러 방법들을 소개하고 모의실험을 통해 그 유효성을 확인하였다.
이병섭 한국해양학회 2002 바다 Vol.7 No.3
국립해양조사원은 우리나라 전 해역을 대상으로 해양교통안전, 해양자원 개발, 군 작전 지원, 해양수산 발전에 필요한 정보를 제공하고자 조석, 조류, 해류관측에 의해 수집된 각종 해양자료를 처리·분석하고 DB화하고 있다.
Effect of Epoxy Cracking on Initial Quench Behaviorabout High Field Superconducting Magnet
이병섭,유종신,김동락,최연석,양형석 한국초전도.저온공학회 2006 한국초전도저온공학회논문지 Vol.8 No.4
The study to be presented related on initial behavior of quench concerned with many considerations, such as epoxy impregnated coil, critical current density related on strain and temperature, winding effect and behavior of internal superconducting wire. Especially, the deformation behavior of coils under magnetic field and thermal contractions at cryogenic temperatures to be dealt with the analytical method related on Fracture Mechanics. From the results, we know that the strain by self weight contribute to epoxy cracking at the edge of deformed coils and the deformation behavior relate on epoxy cracking must be dealt with biaxial loading problem. Then, the epoxy crack on rθ-plane under biaxial loading have been propagated with inclined crack angle and joined superconducting wire. Also, we can explain transfer of epoxy crack propagation energy from epoxy resin to superconducting wire.
이병섭,박석하,강경식 대한안전경영과학회 2007 대한안전경영과학회 학술대회논문집 Vol.2007 No.04
The purpose of this study is to examine the actual condition of environment conscious logistics system which is essential to make material recycling economic society. Environment conscious logistics management which meant simply recycle is tend to promote material reduction, reuse and recycling. We have made case studies about advanced environment conscious logistics system. To examine korean companies' environment conscious logistics system, we made survey form which is consist of 81 questionnaires in Korea between 2003 and 2005. And we have analyzed the survey responses. As a result of this study, we propose the way of constructing environment conscious logistics system in Korea.