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항공전투/효율성 및 생존력을 향상시키는 미국의 Litton Applied Technology사
유태선,Yu, Tae-Seon 한국방위산업진흥회 1991 國防과 技術 Vol.- No.147
제2차 세계 대전 이후 일련의 항공 및 지상 위협들이 출현하고 급속히 변천함에 따라, 전자전 분야의 발전을 알기 위해서는 Litton Applied Technology사를 알아야 한다. 위협 및 레이다 경보수신기 분야의 주역으로서 Litton사는 소련제 지대공 유도탄 체계와 MiG전투항공기의 레이다 방사 신호를 탐지하는 최초의 항공탑재 탐지기와 같은 새로운 분야를 개척하였다
유태선,홍영호 중앙대학교 의과대학 의과학연구소 1993 中央醫大誌 Vol.18 No.3
Allergic rhinitis is a common clinical entity affecting at least 10% of the population, and the incidnece is increasing. Although many studies aboout the pathogenesis of allergic disease have been done, definite pathogenesis remained uncertain. The purpose of this study was to evaluate the distribution of immunoglobulin-bearing cell sin nasal mucosa, and to compare the difference between alletgic and non-allergic rhinitis. We studied the thirty one histopathologic specimens of inferior turbinate mucosa from 17 allergic rhinitis and 14 non-allergic rhinitis from Oct. 1992 to Mar. 1993. The specimens were examined with hematoxylin-eosin staining and peroxidase-antipeoxidase immunohistologically. The results were as follows: 1) The number of IgA-bearing cells in epithelial layer and stroma of allergic rhinitis group were significantly higher than non-allergic rhinitis group(P<0.05). 2) In glandular area, there was no statistically significant differance in the number of IgG-, IgA-, and IgM-bearing cells between allergic and non-allergic rhinitis. 3) In epithelial layer and stroma, there was no statistically significant differance in the number of IgG-and IgM-bearing cells between allergic and non-allergic rhinitis. 4) In allergic rhinitis, IgG-bearing cells were predominantly infiltrated in glandular area histologically.
Quality Issues in Scheduling Robotized Semiconductor Manufacturing Tools
유태선,이태억 한국품질경영학회 2021 한국품질경영학회 학술대회 Vol.2021 No.-
As the design of integrated circuits has become increasingly complicated and dense, serious wafer quality problems are observed in modern wafer fabrication facilities. Therefore, in cluster tools of leading fabs process chambers are periodically cleaned in order to eliminate residual chemicals and impurities that can damage the wafer quality. A chamber cleaning operation is mainly applied to tools in which a wafer delay has a crucial impact on the wafer quality, and hence the need of wafer delay control becomes more significant when chamber cleaning is considered. Thus, we first examine how wafer delays can be specified for cluster tools with chamber cleaning operations. We confirm that wafer delays are substantially increased when chambers are periodically cleansed, and we show that such increased wafer delays cannot be eliminated or reduced using the existing scheduling methods. In such a case, we prove that a partial loading strategy can minimize both the tool cycle time and the wafer delays by controlling the number of wafers being loaded into parallel chambers. We also present how wafer delays under the partial loading strategy can be further reduced by introducing a timing control method that regulates the start times of robot tasks.
유태선 원광대학교 2006 圓光軍事論壇 Vol.- No.2
This paper presents the development trends of Electronic Warfare (EW) considering the future digitized battlefield. It is described the feature of the future warfare resulted from the progress in scientific technologies such as information technology, nano technology and so on, together with the scientific research trends. This paper takes into account the various types of the core military weapon systems and the development trends of those systems which are the outcomes of the scientific progress, and introduces the future direction of the EW developments which can effectively neutralize those military weapon systems in the future Network Centric Warfare(NCW). Specially, this paper investigates the development trends of high-speed and large capacity C4(Command, Control. Communication, and Computer) networks and highly accurate Intelligence, Surveillance and Reconnaissance(ISR) sensor systems, Precision Guided Munitionsf POlvls). and intelligent unmanned combat platforms. It is suggested the advanced EW system development such as Integrated Electronic Warfare SystemOEWS), C2(Command and Control) network jamming system and wide battle-area EW system, which can degrade or destroy adversary combat capabilities combined with C4 networks, ISR systems and PGMs in the future NCW. Finally, this paper emphasizes the need of in-country developments of the next-generation EW weapon systems considering newly-emerging threats around the Korean peninsular.
활주 직전과 제동 직전 속도의 상관관계 규명에 관한 연구
유태선,전진우,박홍한,이수범 대한교통학회 2009 대한교통학회지 Vol.27 No.1
This paper investigates the accuracy of vehicle pre-braking speed estimates based upon tire/roadway coefficient of friction(drag factor) measurements and skid mark measurements. Data for pre-braking and pre-skidding speeds were collected to determine if there were any correlations between pre-braking speeds and pre-skidding speeds. Braking tests were performed on two vehicles using various measurement devices including a fifth wheel, a speed gun, and a vericom 2000. The vehicle speeds, braking distances, skid mark distances, and deceleration histories were recorded. From these data, coefficients of friction and vehicle pre-skidding speeds for the tested road surface were calculated. The pre-skidding speeds were then compared to the actual pre-braking speeds of the vehicles in order to establish relationships between pre-skidding and pre-braking speed. A correlation between the pre-skidding speed and the actual pre-braking speed was established for the study data. 이 논문은 타이어-노면간 마찰계수(drag factor)와 노면에 발생된 스키드마크를 통해 제동직전 속도(pre- braking speed) 산정을 정확하게 하기 위한 방법론을 제시하고자 한다. 제동직전 속도(pre-braking speed)와 활주직전 속도(pre-skidding speed)간 어떠한 상관관계가 있는지 판단하기 위해 실차 주행 및 제동실험을 통해 데이터가 수집되었다. 두 대의 차량에 fifth wheel(오륜) 장비, 스피드건, vericom 2000 등 다양한 측정장비를 탑재하여 제동실험이 수행되었으며, 자동차 속도, 제동거리, 활주거리, 감속도 등이 정밀측정되었다. 실험자료의 분석을 통해 노면 마찰계수값과 활주직전 속도를 산정하고, 이후 활주직전 속도와 제동직전 속도를 비교하여 이들간의 상관관계를 규명하였다. 결과적으로 산정된 마찰계수값은 현재 일반적으로 적용되고 있는 0.8보다 높았으며, 제동직전 속도는 활주직전 속도보다 5~10km/h 정도 높은 것으로 나타났다. 향후에는 다양한 차종과 노면조건에 대한 후속실험을 통해 더욱 정교한 한국형 분석모형의 개발과 실무적용이 필요할 것으로 판단된다.
유태선,이유신,박현곤,김도희,배혜림 한국산업정보학회 2022 한국산업정보학회논문지 Vol.27 No.6
본 연구에서는 조수조건이 고려된 벌크항만의 하역 최적화를 위한 정수계획모형을 제안한다. 특히, 본 연구에서는 실제 벌크항만의 운영 환경과 조건들을 반영하여 체선료(Demurrage Cost)와 조출료(Dispatch Money)를 모두 고려한 하역비용 최소화를 목적함수로 설정하고, 벌크항만의 서비스 수준을 결정하는 최소재고 제약조건 또한 고려한다. 일반적으로 비선형 함수 형태로 표현되는 체선료 계산식을 선형화(Linearize)하여 스케줄 해상도를 향상하고, 조수조건을 고려한 선석할당 문제의 경우 전통 자원할당 모형에서 필수적인 Big-M 제약식이 대체 가능함을 확인한다. 실험결과를 통해 기존 모형 대비 계산복잡도와 전역최적성이 크게 향상 가능함을 검증한다.