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최혁진(H.J.Choi),오상우(S.W.Oh),이승국(S.G.Lee),김선동(S.D.Kim),이승현(S.H.Lee),이문진(M.J.Lee),변성훈(S.H.Byun),강원수(W.S.Kang),장석(S.Jang) 한국해양환경·에너지학회 2006 한국해양환경·에너지학회 학술대회논문집 Vol.2006 No.-
유조선 경신호는 1988년 포항 대보등대 3.5마일 해상에 침몰하였다. 침몰후 현재까지도 간헐적으로 잔존유가 유출되고 있어 선체내부에 남아 있는 잔존유의 추가 유출에 따른 해양오염사고 발생에 대한 위험성이 재기되고 있다 침몰선체로부터 잔존유 추가 유출 가능성을 조사하기 위해 2006년 5월 무인잠수정과 잔존유 시료채취장치 등 첨단 장비를 이용하여 경신호를 조사한 결과 선체 주변에는 이미 많은 장애물로 덮여 있으며, 잔존유 시료를 채취한 결과 탱크 내부에는 약 300㎘ 이상의 기름이 남아 있는 것으로 분석되었으며, 부식 등의 요인으로 잔존유 유출시 기상상태에 따라 차이는 있으나 1988 사고 당시와 같은 기상상태가 재현된다면 유출된 기름은 포항, 영덕 등 인근 해안가에 부착될 가능성이 있다. The oil tanker, Kyung Shin had sunken in the East Sea, 3.5 mile from Daebo light house of Pohang, Korea in 1988. Because the remained oil of the sunken tanker has been leaking slightly nowadays, it can be a dangerous marine pollutant. For the inspection of additional oil leakage and its possibility, the sunken ship, Kyung Shin was surveyed by using the ROV and oil sampling system in May, 2006. As a result of survey, there are numbers of obstructions on the tanker's body. Based on the survey results and the precedent salvage report, more than 300㎘ oil could be remained by estimation. If same weather condition is reappeared, spilled oil can stick to the coast near Pohang and Yeongdeok.
특수목적기계용 압력보상 기능을 갖는 4륜 구동 주행 유압시스템 특성 해석
이승현(S. H. Lee),김동명(D. M. Kim),이용석,김상호,권순동(S. D. Kwon) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.11
In this study, the characteristics of the 4 wheel drive travel hydraulic system for special purpose machinery were analyzed using developed analysis program based on Simulation-X tool. From the parametric analysis, the effects of each factor were revealed. Through the simulation with varying parameters, the pressure compesated cotrol parameter effects on the control chrateristic and the pump pressure and load pressure variations were studied. The results were compared with the experimental ones. The results and discussions of the present paper could aid in the design of a 4 wheel drive travel hydraulic control system whith pressure compensated flow control function
이승현 ( S. H. Lee ),김현진 ( H. J. Kim ),최태종 ( T. J. Choi ),김수빈 ( S. B. Kim ),강예준 ( Y. J. Kang ),김동진 ( D. J. Kim ),장석필 ( S. P. Jang ) 한국분무공학회 2015 한국액체미립화학회지 Vol.20 No.1
In this study, we prepare the Ag nanofluids synthesized by the chemical reduction method and measure the extinction coef- ficient of those nanofluids at a wavelength of 632.8 nm. The Ag nanofluids are synthesized by the chemical reduction method using silver nitrate (AgNO3) and sodium borohydride (NaBH4) in water and ethylene glycol (EG). For stable disper- sion of Ag particles in the base liquids, polyvinyl pyrrolidone (PVP) is added as a surfactant. The extinction coefficient of manufactured Ag nanofluids is measured by an in-house developed measurement system at the wavelength of 632.8 nm. The results show that the extinction coefficient of water-based and EG-based Ag nanofluids is linearly increased with respect to the particle loadings. Moreover, it is shown that the extinction coefficient of EG-based Ag nanofludis is higher than that of water-based Ag nanofluids. Finally we compare the experimental results with both the Maxwell-Garnett model and Rayleigh scattering approximation model, and they demonstrate that the Rayleigh scattering approximation model is reasonably predict the extinction coefficient of Ag nanofluids using hydraulic diameter of silver nanoparticle.
원 펌프 4 륜 구동 주행 유압 제어 시스템에 대한 동조 특성 해석
이승현(S. H. Lee),김영렬(Y. R. Kim),이양수(Y. S. Lee) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.11
In this study, the synchronized characteristics of the 4 wheel drive travel hydraulic control system for special purpose machinery were analyzed using developed analysis program based on Simulation-X tool. From the parametric analysis, the effects of each factor were revealed. Through the simulation with varying parameters, the pressure compensated control parameter effects on the control charateristics and the pump pressure and load pressure variations were studied. The results and discussions of the present paper could aid in the design of a 4 wheel drive travel hydraulic control system with pressure compensated flow control function
상지 장애인의 모바일 사용을 위한 제스처 기반 인터페이스
이승현(S. H. Lee),이원영(W. Y. Lee),공정식(J. S. Kong),이응혁(E. H. Lee) 한국재활복지공학회 2012 한국재활복지공학회 학술대회논문집 Vol.2012 No.11
In this paper, with the advent of the information age, in everyday life using smart phones can get more information. Among them, to improve the quality of life of people with disabilities is very important for the operation of your phone. Therefore, people with disabilities to easily operate more smart phone using the gyro sensor and accelerometer to control the movement can be recognized and proposed smartphone.