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CF₄ 제거를 위한 유동층 반응기를 이용한 열 플라즈마-촉매 스크러버 특성 연구
조동현(Donghyun Cho),조성권(Sungkwon Jo),강홍재(Hongjae Kang),강우석(Woo Seok Kang) 대한기계학회 2022 大韓機械學會論文集B Vol.46 No.1
지구온난화에 따른 기후 문제가 심각해지는 반면, 세계적인 반도체 수요 증가로, 온실가스인 과불화화합물 사용량이 증가하고 있다. 특히, 높은 열분해 온도를 갖는 CF₄ 제거를 위해 많은 에너지를 소모하고 있다. 에너지 효율이 높은 스크러버 기술 개발을 위해 열 플라즈마-촉매 조합에 대한 연구를 수행하였으며, CF₄ 제거 특성 및 에너지 효율을 분석하였다. 플라즈마 열의 집중에 따른 부작용을 최소화하기 위해 유동층 촉매 반응기를 적용한 새로운 열 플라즈마-촉매 반응기를 적용하였으며, 고정층 촉매반응기와의 CF₄ 분해 성능 및 온도 분포를 비교하였다. 그 결과, 높은 온도 균일성 및 95%의 CF₄ 분해율을 확인하였다. 또한, 기존 플라즈마 단독 스크러버 대비 약 2.5배 이상 에너지 효율을 확보할 수 있었다. 본 연구의 결과는 열 플라즈마-촉매 방식의 고효율 스크러버 개발에 기여할 것 기대한다. To develop a scrubber technology with high energy efficiency, a study was conducted on a thermal plasma-catalysis combination in which carbon tetrafluoride (CF₄) removal characteristics and energy efficiency were analyzed. To minimize the side effects caused by the concentration of the plasma heat, a new thermal plasma-catalysis reactor equipped with a fluidized bed was applied. The CF₄ decomposition and temperature distribution were compared with that of a fixed bed. As a result, high uniformity of temperatures and CF₄ decomposition of 95% were confirmed. In addition, it was possible to secure about 2.5 times or greater energy efficiency compared to the existing scrubber containing only plasma. The results of this study are expected to contribute to the development of an energy-efficient scrubber using a thermal plasma-catalysis.
교육시설의 개선 방향에 관한 연구-대구시 초등학교의 도서실 및 미디어 관련시설의 면적 구성에 관하여-
조동현(Cho. Donghyun),김교준(Kim. Kyojoon),이상홍(Lee. Sanghong) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The current school library and related media facilities are not enough to take their own role for the 7th curriculum that try to match with theses technology and information world. This study propose the direction of future media center that the information world demands for and maximum efficiency of space. Thorough the area composition of the existing library and related facilities. The sample schools were chosen as standard schools which of number is below 2000 people above 800 people in the city of Daegu which is metropolis except the capital region.<br/> Planning library and media relation facilities, we should consider requirement of the user in the information world for the area composition and ratio.
유동층 반응기를 이용한 열 플라즈마-촉매 반응기에서 CF₄ 제거 성능 평가
조동현(Donghyun Cho),조성권(Sungkwon Jo),이대훈(Dae Hoon Lee),강우석(Woo Seok Kang) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
As part of the development of a scrubber for the removal of warming gases generated in semiconductor and display industries, an evaluation of CF₄ removal was conducted by using a thermal plasma-catalysis reactor that applied with a fluidized bed. The fluidized bed can stabilize the temperature of the catalyst bed due to its high heat transfer characteristic and minimize the effect of particle impurities generated in the semiconductor and display processes. CF₄ was used as a reactant gas, and the removal rate and design factors of the thermal plasma-catalysis reactor were confirmed through experiments. As a result, the fluidized bed reactor can secure high temperature uniformity without hot spots compared to the fixed bed catalytic reactor. The CF₄ removal rate is affected by the space velocity of the catalyst, and it was possible to secure up to 95% or more. In addition, main elements for designing the thermal plasma-catalysis reactor and directions for performance improvement were presented.
조동현(Donghyun Cho),오성진(Sungjin Oh),유용희(Yonghee You),성미영 (Mee Young Sung),전경구(Kyungkoo Jun) 한국HCI학회 2008 한국HCI학회 학술대회 Vol.2008 No.2
본 논문에서는 PC의 사운드 출력단자로부터 나오는 신호를 실시간으로 분석하여 다양한 진동 효과를 발생시키는 진동 시스템을 개발한다. 이 시스템은 특정 사운드 발생을 감지하여 미리 프로그램 된 진동패턴을 발생시킬 수 있다. 이것은 게임이나 가상현실 애플리케이션의 실감성과 몰입감을 증진시킬 수 있다. 또한 진동을 고려하지 않고 개발된 애플리케이션에 손쉽게 진동기능을 부가시킬 수 있는 장점을 가지고 있다. 이를 위해서 본 시스템에서는 사운드 신호처리를 위해 외부 DSP보드를 이용하며 손목에 부착하는 형태의 진동패드를 개발한다. 기존 사운드 기반 진동 장치들과 비교했을 때, PC외부의 DSP 보드를 이용하기 때문에 다양한 사운드 감지가 가감하면서도 성능이 우수하며, PC 성능에 영향을 주지 않는다. 또한 손목형 진동패드를 사용하기 때문에 기존 마우스나 조이스틱 형태의 진동 장치보다 실감 있는 진동효과가 가능하다. In this paper, we develop a vibration system which can generate diverse vibration effects in realtime by analyzing signals from the sound output of PC. This system is able to detect the occurrences of particular sounds in order to generate corresponding pre-programmed vibration patterns. It contributes to the improvement of the reality and the immersiveness of games and virtual reality applications. In addition, its advantage is to easily add vibration features to applications which were originally developed without consideration for vibration. Our system consists of an external DSP board for signal processing and a vibration pad which can be put on wrists. It is superior to other sound-driven vibration devices because its DSP board can detect more diverse sounds, has higher performance and does not interfere with PC. Also the wrist-wearable vibration pad is able to generate more realistic vibration than other mouse or joystick type devices.
조동현(Cho Donghyun),이상홍(Lee Sanghong),홍원화(Hong Wonhwa) 한국주거학회 2004 한국주거학회 논문집 Vol.15 No.6
This study proposes the direction of planning and designing for the media related facilities through the future concepts of media-center even though the concept and environment of the media-center are developed mealy at elementary schools in Korea. This study investigates and analyzes whether the present facilities are ready for the efficient education and improved facilities through comparison between after and before the 7th education program of systems of the academic support facilities. Therefore this study proposes the direction of developing and designing media-center through the field survey, make-up questionaries and analyzing architectural drawings of media related facilities for the future.
안은혜,조동현,김종범,장영일,정경진,김상진,이호근,류태규,정형석,An, Eunhye,Cho, Donghyun,Kim, Jongbum,Jang, Youngil,Jeong, KyeongJin,Kim, Sangjin,Lee, Hokeun,Reu, Taekyu,Chung, Hyoungseog 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.1
This study investigates store separation characteristics of an unmanned aerial vehicle having generic stealth configuration over unsteady flow of an internal bay. Free-drop wind tunnel tests are conducted to simulate bomb releases from an internal weapons bay while high-speed camera images are taken. The images are analyzed to examine the effects of flow velocity, angle of attack, flap deflection and the ejector force application on the store separation trajectories. For the free-drop wind tunnel tests, Froude Scaling is applied to match the dynamic similarity for the bomb model, and the ejector force is simulated by using small pneumatic cylinders. The results indicate that the test bomb model safely separates from the internal bay at the given test conditions and configurations. It is also observed that the effects of the flow velocity and ejector force application have greater impacts on the separation trajectories than those of angle of attack and flap deflection.