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(Ba,Sr)TiO₃ 박막의 전기적 성질과 누설전류 전도기구
정용국(Yong-kuk Jeong),임원택(Won-taeg Lim),손병근(Byoung-keun Son),이창효(Chang-hyo Lee) 한국진공학회(ASCT) 2000 Applied Science and Convergence Technology Vol.9 No.3
고주파 스퍼터링 방법으로 증착조건을 변화시키면서 BST 박막을 제작하였다. 증착온도가 높을수록, Ar/O₂ 비가 적을수록 우수한 전기적 특성을 보였다. 누설전류 전도기구를 분석하기 위해 Schottky 모델과 modified-Schottky 모델을 도입하였다. BST 박막의 누설전류 전도기구는 기존의 Schottky 모델이 아니라 modified-Schottky 모델을 따른다는 것을 알았다. Modified-Schott 앙 모델을 사용하여 광학유전상수 ε=4.9, 이동도 μ=0.019 ㎠/N-s, 그리고 장벽높이 φ_b=0.79 eV를 구하였다. BST thin films were prepared with various deposition conditions by rf-magnetron sputtering. As substrate temperature increases and Ar/O₂ ratio decreases, the electrical properties of the BST films improve. The conventional Schottky model and modified-Schottky model were introduced in order to investigate the leakage-current-conduction mechanisms of the deposited films. It was found that the modified-Schottky model better describes the current-conduction mechanism in the BST films than the conventional Schottky model. From the modified-Schottky model, optical dielectric constant (ε), electronic drift mobility (μ), and barrier height (φ_b) are calculated as ε= 4.9, μ=0.019 ㎠/V-s and φ_b= 0.79 eV.
공정 중심 시뮬레이션 모델링 방법론을 이용한 조선소 생산 시뮬레이션 시스템
정용국(Yong-Kuk Jeong),우종훈(Jong-Hun Woo),오대균(Dae-Kyun Oh),신종계(Jong-Gye Shin) (사)한국CDE학회 2016 한국CDE학회 논문집 Vol.21 No.2
Shipbuilding process takes a long time for producing final products, and needs many different resources. Because of these characteristics, it has been studied about shipyard simulation and virtual manufacturing that is able to implement the virtual manufacturing process. However, among the previous researches, it requires considerable time and effort to construct simulation model since the systematic methodology has not been used for simulation modeling. Also, reusability of constructed simulation model was low. Therefore, this research defines the method to construct shipyard simulation system using the process-centric simulation modeling methodology and shipyard simulation framework. This paper also validates the utility of this methodology through applying to construct simulation model for the shipyard master plan validation.
쌍동형 배수량 2.5톤 급 어선의 전기 추진 시스템 운항성능 추정 프로세스 연구
정용국(Yong-Kuk Jeong),이동건(Dong-Kun Lee),정우철(Uh-Cheul Jeong),류철호(Cheol-Ho Ryu),오대균(Dae-Kyun Oh),신종계(Jong-Gye Shin) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.5
Because the environmental regulations for ships are getting tighter, green ships employing eco friendly technology have recently received a large amount of attention. Among them, various studies for electric propulsion ships have been carried out, particularly in the United States, European Union, and Japan. On the other hand, research related to electric propulsion ships in Korea is in a very nascent stage. In this paper, an estimation process based on the rough requirements of ship owners for the operating performance of electric propulsion ships is proposed. In addition, the estimation process is applied to a small fishing boat for verification of the process. These results are expected to be used as design guidelines in the early stage of the design for electric propulsion ships.
Differential evolution 알고리즘을 이용한 생존성 기반의 함정 격실배치 애플리케이션 개발
김영민(Youngmin Kim),정용국(Yong-Kuk Jeong),주수헌(SuHeon Ju),신종계(Jong-Gye Shin),신정학(Jung-Hack Shin) (사)한국CDE학회 2014 한국CDE학회 논문집 Vol.19 No.4
Unlike other weapon systems, a naval vessel has unique characteristics in that the vessel itself is a naval unit. In limited space, compartments with various objectives and characteristics need to be arranged, so that vessel performance is maximized. This paper studied a compartment arrangement algorithm that considers activity relationships among compartments and survivability of a vessel. Based on the study, a compartment arrangement application is developed that can generate various layout alternatives swiftly. The application developed in this study aims at automating a two dimensional compartment layout problem. A combinatorial optimization is performed with the differential evolution algorithm to achieve the optimized layout.
주수헌(SuHeon Ju),김영민(Youngmin Kim),정용국(Yong-Kuk Jeong),신종계(Jong-Gye Shin) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2
Unlike other weapon systems, a naval vessel has unique characteristics in that the vessel itself is a naval unit. In limited space, compartments with various objectives and characteristics need to be arranged, so that vessel performance is maximized. This paper studied a compartment layout algorithm that considers activity relationships among compartments and survivability of a vessel. Based on the study, a compartment layout application is developed that can generate various layout alternatives swiftly. The application developed in this study aims at automating a two dimensional compartment layout problem. A combinatorial optimization is performed with the differential evolution algorithm to achieve the optimized layout.