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고선택비 인산공정에서의 식각율 향상과 SiO<sub>2</sub> 재성장에 관한 연구
이승훈,모성원,이양호,배정현,Lee, Seunghoon,Mo, Sungwon,Lee, Yangho,Bae, JeongHyun 한국재료학회 2018 한국재료학회지 Vol.28 No.12
To improve the etch rate of $Si_3N_4$ thin film, $H_2SiF_6$ is added to increase etching rate by more than two times. $SiO_3H_2$ is gradually added to obtain a selectivity of 170: 1 at 600 ppm. Moreover, when $SiO_3H_2$ is added, the etching rate of the $SiO_2$ thin film increases in proportion to the radius of the wafer. In $Si_3N_4$ thin film, there is no difference in the etching rate according to the position. However, in the $SiO_2$ thin film, the etching rate increases in proportion to the radius. At the center of the wafer, the re-growth phenomenon is confirmed at a specific concentration or above. The difference in etch rates of $SiO_2$ thin films and the reason for regrowth at these positions are interpreted as the result of the flow rate of the chemical solution replaced with fresh solution.
양극성 DC 배전 시스템 적용을 위한 결합 인덕터 기반의 전압 밸런싱 이중 출력 CLL 공진형 컨버터
이승훈,김정훈,차헌녕,Lee, Seunghoon,Kim, Jeonghun,Cha, Honnyong 전력전자학회 2022 전력전자학회지 Vol.27 No.4
A bipolar DC distribution system suffers from an imbalance in voltages when asymmetric loads are connected at the outputs. Dedicated voltage balancers are required to address the imbalance in bipolar voltage levels. However, additional components eventually increase the cost and decrease the efficiency and power density of the system. Therefore, to deal with the imbalance in output voltages without adding any extra components, this study presents a coupled inductor-based voltage balancing technique with a dual-output CLL resonant converter. The proposed coupled inductor does not require extra magnetic components to balance the output voltages because it is the result of resonant inductors of the CLL tank circuit. It can also avoid complex control schemes applied to voltage balancing. Moreover, with the proposed coupled inductor, the CLL converter acquires good features including zero voltage and zero current switching. Detailed analysis of the proposed coupled inductor is presented with different load conditions. A 3.6-kW hardware prototype was built and tested to validate the performance of the proposed coupled inductor-based voltage balancing technique.
원자력발전소 기자재 라이브러리 구성을 위한 속성 값 기반 분류체계 확장
이승훈(Seunghoon Lee),권순조(Soonjo Kwon),김우중(Woojoong Kim),한순흥(Soonhung Han) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.하계
During a nuclear power plant life-cycle exceeding 60 years, data interoperability problems are occurred in its life-cycle. Standard classification among over than several hundred organization in plant project for their equipment definition is important to solve data interoperability problem. In particular, ISO 15926-4 proposes Initial Reference Data Library (IRDL) to solve data interoperability problems using a common reference data dictionary. However, there are no standard equipment classification (dictionary) for nuclear power plant industry. A process plant and a nuclear power plant have common features, it can be referred to make new equipment library for nuclear power plant. Therefore, in this paper, the authors analyze current status of equipment classification in the current nuclear power plant and suggest a way of mapping to build a reference data library for the nuclear industry. The authors then propose an extended classification methodology using characteristic of property value.
서로 다른 프리미티브 집합을 사용하는 CAD 시스템 사이에 선박 의장 설계 데이터의 교환
이승훈(Seunghoon Lee),한순흥(Soonhung Han) (사)한국CDE학회 2013 한국CDE학회 논문집 Vol.18 No.3
Different CAD systems are used in ship outfitting design on different usage and purpose. Therefore, data exchanges between CAD systems are required from different formats. For data exchange, boundary representation standard formats such as IGES and ISO 10303 (STEP) are widely used. However, they present only B-rep representation. Because of different CAD systems have their own geometry format, data exchanges with design intend are difficult. Especially, Tribon and PDMS use primitives for express their geometry in ship outfitting design. However, Tribon primitives are represented their parameter by values that are non-parametric. Therefore, data size of catalogue library is bigger than different CAD system using parametric primitive representation. And that system has difficulty on data reprocessing. To solve that problem, we discuss about shape DB which contains design parameters of primitive for exchange Tribon primitives. And geometry data exchange between Tribon and Shape Database that defines based on PDMS scheme are specified using primitive mapping that can represent design intend.