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이규성,임정욱,강만구,김경현,류호준,Lee, Kyu-Sung,Lim, Jung Wook,Kang, Mangu,Kim, Kyung Hyun,Ryu, Hojun 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.5
Smart window technology has become a major component of smart buildings, leading to energy savings and enhanced functionality. Smart windows work like curtains or blind screens, blocking external light sources. Smart window components employ electrochromic or photochromic materials that can selectively block sunlight when electricity is applied. The installation of low-E glass and building-integrated photovoltaics (BIPV) is being encouraged in accordance with the policy on saving building energy. To incorporate BIPV into smart windows, the transparency and colors of transparent photovoltaics must be optimized. The power sources required to operate these smart windows take advantage of the transparent color of the solar cells, which also facilitates aesthetics. Self-powered smart windows that combine electrochromic or photochromic screens with transparent solar cells suggest a promising convergent technology.
정용재(Yongjae Jeong),류호준(Hojun Ryu),최초롱(Chorong Choi),안상현(Sanghyeon An),김우중(Woojung Kim),김동호(Dongho Kim),최병서(Byeongseo Choi),Bipinchandra K. Salunke,김범수(Beom Soo Kim) 한국생물공학회 2016 KSBB Journal Vol.31 No.4
Recently, numerous studies have utilized graphene in biomedical applications such as drug delivery, cancer therapy, and bioimaging. In this study, graphene was eco-friendly prepared by liquid phase exfoliation of graphite using plant extracts in water. Initially, 12 different plants or plant parts were screened for the characteristic graphene peak at near 268 nm using UV-Vis spectrophotometric analyses. The ability to form stable black graphene dispersion was highest using Xanthium strumarium extract. Transmission electron microscopy images showed that about 5 layer-graphene was produced from 1 g/L of graphite, while more than 5 layers were formed from 2 g/L of graphite. The optimum X. strumarium concentration for graphene production was 2 g/100 mL.
Ag/에폭시간 계면 접착력 향상을 위한 전해 실란 처리
공원효(Wonhyo Kong),박광렬(Gwangryeol Park),류호준(Hojun Ryu),배인섭(Inseob Bae),강성일(Sung-il Kang),최승회(Seunghoe Choe) 한국표면공학회 2023 한국표면공학회지 Vol.56 No.1
The reliability of leadframe-based semiconductor package depends on the adhesion between metal and epoxy molding compound (EMC). In this study, the Ag surface was electrochemically treated in a solution containing silanes in order to improve the adhesion between Ag and epoxy substrate. After electrochemical treatment, the thin silane layer was deposited on the Ag surface, whereby the peel strength between Ag and epoxy substrate was clearly improved. The improvement of peel strength depended on the functional group of silane, implying the chemical linkage between Ag and epoxy.
다구찌 강건 설계를 통한 자장 여과 아크 소스로 증착된 사면체 비정질 탄소막의 최적화
곽승윤(Seung-Yun Kwak),장영준(Young-Jun Jang),류호준(Hojun Ryu),김지수(Jisoo Kim),김종국(Jongkuk Kim) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.2
The properties of tetrahedral amorphous Carbon (ta-C) film can be determined by multiple parameters and comprehensive effects of those parameters during a deposition process with filtered cathodic vacuum arc (FCVA). In this study, Taguchi method was adopted to design the optimized FCVA deposition process of ta-C for improving deposition efficiency and mechanical properties of the deposited ta-C thin film. The influence and contribution of variables, such as arc current, substrate bias voltage, frequency, and duty cycle, on the properties of ta-C were investigated in terms of deposition efficiency and mechanical properties. It was revealed that the deposition rate was linearly increased following the increasing arc current (around 10 ㎚/min @ 60 A and 17 ㎚/min @ 100A). The hardness and ID/IG showed a correlation with substrate bias voltage (over 30 ㎬ @ 50 V and under 30 ㎬ @ 250 V). The scratch tests were conducted to specify the effect of each parameter on the resistance to plastic deformation of films. The analysis on variances showed that the arc current and substrate bias voltage were the most effective controlling parameters influencing properties of ta-C films. The optimized parameters were extracted for the target applications in various industrial fields.
최선규(Sun Gyu Choi),A. Sivasankar Reddy,유병곤(Byoung-Gon Yu),류호준(Hojun Ryu),박형호(Hyung-Ho Park) 한국진공학회(ASCT) 2008 Applied Science and Convergence Technology Vol.17 No.2
La0.7Sr0.3MnO₃ 박막을 rf 마그네트론 스퍼터를 이용하여 챔버 내 산소가스유량비를 0, 40, 80 sccm 으로 조절하고 후열처리 공정 없이 기판온도를 350℃로 유지하면서 SiO₂/Si(100) 및 Si(100) 기판에 증착하였다. 증착된 La0.7Sr0.3MnO₃ 박막은 SiO₂/Si(100), Si(100) 기판 모두 (100), (110), (200)면을 갖는 polycrystalline 상태였으며, oxygen flow rate이 증가함에 따라 박막의 grain size가 증가하였다. 증가되는 grain size로 인하여 grain boundary가 감소하였고 따라서 높은 oxygen flow rate에서 증착된 박막은 면저항이 감소하는 현상을 나타내었다. SiO₂/Si 기판과 Si 기판에 증착된 LSMO 박막의 TCR 값은 약 -2.0 ~ -2.2%를 나타내었다. La0.7Sr0.3MnO₃ films were deposited on SiO₂/Si and Si substrates annealed at 350℃ by rf magnetron sputtering. The oxygen gas flow rates were varied as 0, 40, and 80 sccm. Without post annealing process, La0.7Sr0.3MnO₃ thin films on SiO₂/Si and Si substrates were polycrystalline with (100), (110), and (200) growth planes. The grain size of La0.7Sr0.3MnO₃ thin films was increased with increasing oxygen gas flow rate. The sheet resistance of La0.7Sr0.3MnO₃ thin films was decreased with oxygen flow rate due to the increased grain size which induced a reduction of grain boundary. TCR (temperature coefficient of resistance) values of La0.7Sr0.3MnO₃ thin films were obtained from -2.0% to -2.2%.
동적 소음저감 기법을 적용한 차량용 소음기가 엔진 성능에 미치는 영향에 대한 연구
김철호(Chul-Ho Kim),백은석(EunSeok Baek),방미연(Miyeon Bang),류호준(Hojun Ryu),이종진(Jongjin Lee),정상훈(Sang-Heon Chung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The purpose of this study is on the development of a muffler system which controls the noise and static pressure drop of the exhaust gas of an automobile engine with the concept of the dynamic control method. The control the noise and pressure resistance of the muffler system, the muffler system is designed with two rotating impellers installed in the muffler cavity. Compared to a conventional muffler that has baffles and connecting pipes in the muffler chamber, new concept of the muffler system named Dyna-muffler, has two rotating impellers installed into the muffler chamber separated into two cavities. Each rotor has 6 blades and it acts as a moving baffle absorbing kinetic and pressure energy of the high-pressure, high-speed exhaust gas from the engine. From the experiments, it was found that the pressure resistance of the Dyna-muffler is quite similar to the conventional static muffler in the normal engine operating range. To understand the performance of the Dyna-muffler on the engine efficiency and output power, the engine dynamometer experiments will be conducted.
류호준 ( Ryu¸ Ho-jun ) 한국복음주의역사신학회 2020 역사신학 논총 Vol.37 No.-
본 논문은 해방 직후 한국의 교육정책을 주도하기 위해 형성된 교육 주도세력의 모체가 된다고 평가받는 ‘천연동 모임’의 성격과 역사적 의의를 분석, 평가하고자 하였다. 이를 위해서 ‘천연동 모임’에 참석한 것으로 알려진 오천석, 김성수, 백낙준, 김활란, 유억겸의 생애와 교육사상을 연구하고 이들 사이에 있는 공통점을 분석하였다. 그 결과 천 ‘연동 모임’에 참석한 이들에게선 기독교, 교육구국운동, 우파 정당, 해외유학경험, 진보주의 교육사상이라는 다섯 가지 공통점이 나타났다. 이를 통해 ‘천연동 모임’은 기독교 정신에 입각하여 이뤄진 교육구국운동으로 해외 경험을 통해 수용한 진보주의교육을 통해 일제의 전제적 교육을 극복하고자 한 모임이라 분석, 평가된다. This study’s purpose to analyze and evaluate the character and historical significance of the 'Cheonyun-Dong Meeting', which is regarded as the parent of the educational leading forces formed to lead the education policy of Korea immediately after liberation. For this purpose, this study examines the life and educational ideas of Cheon-Seok Oh, Sungsoo Kim, Nak Jun Baek, Hwal-lan Kim , and Eok-gyeom Yu, who is known to have attended the 'Cheonyun-Dong Meeting', and analyzed the commonality between them. As a result, those who attended the 'Cheonyun-Dong Meeting' showed five common points: Christianity, the education movement, the right-wing party, studying abroad experience, and progressive education. 'Cheonyun-Dong Meeting' is a movement to save the nation through education based on the Christian spirit, it is analyzed and evaluated as a group that to overcome the tyrannical education of Japanese imperialism through progressive education had accepted through studying abroad experience.