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조성권(SungKwon Cho) 한국라틴아메리카학회 2009 라틴아메리카연구 Vol.22 No.3
Latin America did not become a primary concern of the US foreign policy during the Bush administration (20012008). Traditionally the issue of drug trafficking, however, has become one of main concerns of US foreign policy toward Latin America. Before taking office as President, in particular, Barack Obama met with Mexican President Calderon and their summit talks was to discuss with drug trafficking and immigration issues as a main agenda of both countries. In this context, this paper is to address searching for a new relationship between US and Mexico about drug trafficking under the Obama administration. For this, this paper, first, will suggest a theoretical framework with a comprehensive human security perspective. Second, this thesis will describe some current situations and problems about drug trafficking as a key issue of both countries. Third, this paper will offer not traditional national security, but a longterm perspective to drug issue. In other words, this will try a synthetic analysis in a comprehensive human security concerning neoliberalism, democracy, corruption, US drug policies to Mexico, arms trafficking from the US, etc. For this, this paper will provide some alternative opportunities for a new relationship between the US and Mexico.
선박엔진의 SCR 성능 향상 및 촉매재생을 위한 플라즈마 버너 실증 평가
조성권(Sungkwon Jo),조동현(Donghyun Cho),이대훈(Dae Hoon Lee),김관태(Kwan-Tae Kim),이재옥(Jae-Ok Lee),송영훈(Young-Hoon Song),장재환(Jae Hwan Jang),노희환(Hui Hwan Roh),박건면(Geon-Myeon Bak),이태우(Tae-Woo Lee),한현식(Hyun-Sik Han) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.4
선박엔진 배기가스의 국제적인 규제가 강화되고 있으며, 규제를 적극적으로 대응하기 위한 기술이 필요하다. 본 연구에서는 플라즈마 버너를 적용하여 선박엔진 배기가스의 질소산화물 저감 성능을 향상시키고, 촉매 재생에 활용하기 위한 가능성을 확인하기 위한 연구를 수행하였다. 실험을 통해, 플라즈마 버너의 연소 성능을 확인할 수 있었으며, 공연비 대비 40% 이하의 공기 조건에서의 안정적인 연소와 배기가스의 산소를 활용한 연료의 완전 연소를 확인하였다. 또한, 요소수를 환원제로 활용한 탈질실험을 수행하였으며, 플라즈마 버너를 통해 탈질 촉매의 작동 영역으로 온도를 제어하여 탈질 성능을 향상시킬 수 있음을 확인하였다. 또한, 촉매 재생을 통해 촉매의 성능이 회복되는 결과로부터 플라즈마 버너를 활용하여 탈질 설비의 내구성 향상에 기여할 수 있음을 확인하였다. We investigated the possibility of applying a plasma burner to improve NOx-reduced performance of a marine engine and to utilize it for catalyst regeneration. Through experiments, we confirmed that stable combustion can be obtained under an air condition of less than 40% air-fuel ratio and can achieve complete combustion of the fuel using oxygen in the exhaust gas. A deNOx experiment using urea as a reducing agent was performed. We confirmed that deNOx performance can be improved by increasing the temperature of the SCR with a plasma burner. Moreover, we confirmed that the performance of the SCR was restored through the regeneration process, implying that the use of the plasma burner can contribute to a durability improvement of the deNOx system in a marine engine.
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.
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.
장동욱(Dongwuk Jang),조성권(Sungkwon Jo),조황래(Hwangrae Cho),방정석(Jeongseok Bang),권세진(Sejin Kwon) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
2,500 N급 과산화수소/케로신 이원 추력기의 성능 향상 및 다양한 임무에 적용하기 위하여 재생냉각의 적용가능성을 검토하였다. 1-D 계산을 통해 과산화수소를 냉각제로 하는 경우에 대한 계산을 수행하였다. 설계된 재생냉각 연소기의 노즐 목에서의 열 유속은 18~20 MW/m2 로 예측되었으며, 그에 따른 유로의 너비는 2.5 mm 높이는 0.45 mm로 설계 되었다. 설계된 유로형상을 바탕으로 냉각 유로 내에서의 압력강하를 예측하기 위한 평판형 모델을 제작하여 실험을 진행하였고, 수치해석결과와 비교를 수행하였다. 그 결과, 수치해석과 실험결과와의 최대 오차는 약 13%, 평균 오차는 약 5%로 계산되었다. Applicability of regenerative cooling in 2,500 N-class bipropellant thruster using hydrogen peroxide and kerosene was considered for improvement performance and application in various missions. Calculation was performed by one dimensional approach using hydrogen peroxide as a coolant. In designed regenerative cooling thruster, heat flux at nozzle throat was estimated at 18 ~ 20 MW/m2. Designed cooling channel width and height were 2.5 mm and 0.5 mm, respectively. Based on designed cooling channel configuration, flat plate model was manufactured and tested for estimation of pressure drop in cooling channel, and CFD analysis was compared with the test result. The maximum error between CFD analysis and experimental result was approximately 13% and average error was approximately 5%.
소형 이원추진제 추력기를 위한 재생냉각 유로형상 설계에 대한 선행연구
장동욱(Dongwook Jang),조성권(Sungkwon Jo),조황래(Hwangrae Cho),방정석(Jeongseok Bang),권세진(Sejin Kwon) 한국추진공학회 2012 한국추진공학회지 Vol.16 No.2
Applicability of regenerative cooling in 2,500 N-class bipropellant thruster using hydrogen peroxide and kerosene was considered for improvement of performance and application in various missions. Calculation was performed by one dimensional approach using hydrogen peroxide as a coolant. The heat flux of thruster at nozzle throat was estimated at 18 ~ 20 ㎿/㎡ . Designed cooling channel width and height were 2.5 ㎜ and 0.5 ㎜, respectively. Based on designed cooling channel configuration, flat plate model was manufactured and tested for estimation of pressure drop in cooling channel, and CFD analysis was compared with the test result. The maximum error between CFD analysis and experimental result was approximately 13% and average error was approximately 5%.