SMB 공정을 이용한 폐기 TNT와 RDX 혼합 용액의 분리

오동훈(Donghoon Oh),김선희(Sunhee Kim),이근득(Keundeuk Lee),안익성(Iksung Ahn),이창하(Chang-Ha Lee) 한국청정기술학회 2017 청정기술 Vol.23 No.2

최근 폐 탄약의 회수를 통한 고에너지 물질의 재활용 및 재사용에 대한 연구가 선진국을 중심으로 활발히 진행되고 있다. 본 연구에서는 재활용 기술응용의 일환으로, 폐 탄약 처리 중 나오는 TNT와 RDX 혼합물을 모사이동층(SMB) 공정을 통해 효율적으로 분리하는 실험과 이에 대한 동적 모사를 수행하였다. SMB 공정의 운전 영역을 설정하기 위하여 혼합용액의 유속변화에 따른 각 물질의 체류시간을 HPLC로 측정하였으며, 모멘트 모델을 이용하여 흡착 컬럼에서 각 물질의 흡착평형을 분석하였다. 흡착 평형과 SMB 운전 삼각법을 통하여 4개의 운전 영역을 결정하였다. 결정된 운전 영역에서 아세토나이트릴과 물이 6:4와 1:1로 구성된 2가지 용매에 대해 SMB 공정을 이용한 분리 실험을 수행하였다. SMB 공정의 운전 조건 변화에 따른 순도, 회수율, 생산성, 용매소비량 등의 4가지 성능 지수를 평가하였다. 또한 SMB 공정에 대한 수학적 모델을 통하여 공정의 동적 모사를 수행하여 실험의 결과와 비교하였다. SMB 공정을 통해 100% 순도의 TNT와 RDX를 얻을 수 있었으며, 동적 모사 결과는 실험 결과와 잘 일치하여 공정 동적 거동 예측과 공정 설계에 적용할 수 있음을 확인하였다. Currently, researches on recycling and reuse of waste energetic materials have recently gained a great attention from advanced countries due to ever tightening environmental regulations. In this study, as a part of a recycling technology, the experiments and dynamic simulation of simulated moving bed (SMB) process were performed to efficiently separate TNT and RDX from their mixture, which are main components of ammunition. In order to determine the operation zone of SMB process, the retention times of TNT and RDX were measured using HPLC at different flow rates and the adsorption equilibrium of each component was obtained by using a moment method. According to the adsorption equilibrium and the triangle theory of SMB process, four operation points were determined and separation experiments were carried out by the SMB process using the solvent consisting of acetonitrile and water. Two different mixing ratios (6:4 and 1:1) of acetonitrile and water were chosen for the experiment due to the great impact of mixing ratio of the solvent on separation. The performance of SMB process was evaluated by purity, recovery, productivity and solvent consumption. Pure TNT and RDX were successfully obtained from the SMB process and the dynamic simulation for the SMB process agreed well with the experimental results. Therefore, the dynamic model could be applied for predicting the dynamic behavior of the SMB process and designing a large scale SMB process.

자동차용 원적외선 복사열 히터 적용 효과에 관한 연구

오동훈(Donghoon Oh),박태용(Taeyong Park),이성제(Sungje Lee),김재웅(Jaewoong Kim) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11

This paper deals with the experimental study for the application effect of far-infrared radiation heater as vehicle cabin heating. Radiation heater can provide quick heating effect direct on the body with low energy consumption. It has no noise, no vibration and no discomfort of heated air when breathing. In this this paper, carbon thread face heating radiation heater that heats about 100℃ is used as a device for the vehicle application. The vehicle wind tunnel test was performed to study the effect on the thermal comfort and heating energy consumption. And also by this test, best radiation heater’s position and proper heating temperature was studied. As a result of vehicle test, thermal comfort level reaching time is reduced by 30~40%, heating energy consumption is reduced by 29~40% at -10, 5℃ ambient temperature.

소성변형특성을 이용한 사실적인 직물 시뮬레이션

오동훈(Donghoon Oh),정문렬(Moonryul Jung),송창근(Changgeun Song),이종완(Jongwan Lee) 한국정보과학회 2006 정보과학회 컴퓨팅의 실제 논문지 Vol.12 No.3

본 논문은 소성변형(plastic deformation)특성을 갖는 직물의 움직임을 시뮬레이션하는 기법을 제안한다. 소성은 탄성과 반대되는 개념으로, 물질이 외부의 힘에 의해 변형되었을 때, 초기상태로 완전히 회복되지못하는 성질이다. 직물은 파티클 모델(particle model)을 이용하여 모델링하며, 파티클간의 상호작용은 바로 인접한 파티클간의 순차연결과 한 파티클 건너에 있는 파티클간의 교차연결을 설정함으로써 표현한다. 순차연결은 직물의 압축과 인장변형을, 교차연결은 직물의 굽힙변형을 표현한다. 연결은 스프링으로 모델링하는데, 순차연결은 탄성스프링으로, 교차연결은 변형정도에 따라, 탄성스프링 또는 소성스프링으로 모델링한다. 본 논문은 기존의 파티클 모델에서 사용하는 탄성스프링에 소성스프링을 추가하여 직물의 소성변형현상을 표현한 것이다. 그 결과, 굽힘주름과 영구변형된 구김주름, 그리고 주름이 직물 전체에 고루 분포되는 현상을 시뮬레이션할 수 있었다. 연결의 탄성스프링과 소성스프링을 모델링할 때 직물운동방정식 수치해법의 안정성을 보장하기 위해 직물 시스템의 강성 메트릭스 (stiffness matrix)가 indefinite이 되지 않도록 주의를 기울였다. This paper presents a cloth simulation technique that implements plastic deformation. Plasticity is the property that material does not restore completely to the original state once deformed, in contrast to elasticity. We model cloth using a particle model, and posit two kinds of connections between particles, i.e. the sequential connections between immediate neighbors, and the interlaced connections between every other neighbors. The sequential connections represent the compression and tension of cloth, and the interlaced connections the bending in cloth. The sequential connections are modeled by elastic springs, and the interlaced connections by elastic or plastic spring depending on the amount of the current deformation of the connections. Our model is obtained by adding plastic springs to the existing elastic particle model of cloth. Using the new model, we have been able to simulate bending wrinkles, permanently deformed wrinkles, and small wrinkles widely distributed over cloth. When constructing elastic and plastic spring models for sequential and interlaced connections, we took pain to prevent the stiffness matrix of the whole cloth system from being indefinite, in order to help achieve physical stability of the cloth motion equation and to improve the effectiveness of the numerical method.

이중대역 무선랜용 역F 안테나 설계

최병혁(Byunghyuk Choi),오동훈(Donghoon Oh),박철민(Cheolmin Park),천창율(Changyul Cheon),김형석(Hyeongseok Kim) 대한전기학회 2005 대한전기학회 학술대회 논문집 Vol.2005 No.7

무공해자동차용 R134a 히트펌프 시스템의 성능에 미치는 영향에 대한 실험적 연구

이대웅(Daewoong Lee),오동훈(Donghoon Oh),지용준(Yongjun Jee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5

This paper deals with the experimental study for the heating performance that could be used for R-134a automobile heat pump systems. Heat pump system is widely studying for zero emission vehicle"s heating system due to small power consumption and effectively heating in the cabin. This paper presents experimental results of the influence of the heating capacity and coefficient of performance. The test was performed with different size of inside heat exchangers and outside heat exchangers, also refrigerant flow rate was considered in two way of flow devices. And heat source, means air heat source and water heat source with heat pump system was examined. The experimental results with heat pump system is to analyze the impact on performance. The best combination of performance is A-inside heat exchanger, B-outside heat exchanger, and B-flow device respectively. And water heat source is roughly 40% better performance than air heat source heat pump system.

무공해자동차용 R134a 히트펌프 시스템 적용 검토에 관한 연구

이대웅(Daewoong Lee),오동훈(Donghoon Oh),지용준(Yongjun Jee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11

The aim of this paper is to investigate the possibility of R-134a heat pump system with conventional air-conditioning system for zero emission vehicles. Heat pump system is one of the solution to heat the air in the cabin and defrost the wind shield using a small power consumption. The system components was consist of inside heat exchanger, outside heat exchanger, electrically driven compressor, electric expansion valve, and refrigerant flow change valve. Cooling capacity was examined by means of vehicle driving conditions and compressor rotational speed. Also heating performance for heat pump system are investigated with different ambient temperature and compressor rotational speed. The experimental results using heat pump system could provide thermally comfort in cabin with small energy consumption than electrically direct heating system. Heating capacity and air discharge temperature are up to 4.89㎾ and 41.7℃ respectively at ambient 0℃ and 7000rpm of compressor rotational speed. And power consumption of the heat pump system is about 1/3 than electric heating system at same heating capacity.

자동차용 R134a 수열원 히트펌프 시스템에 관한 실험적 연구

이대웅(Daewoong Lee),오동훈(Donghoon Oh),지용준(Yongjun Jee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11

This study presented the feasibility of coolant heat source heat pump system as an alternative heating system on the electrically driven vehicles. Heat pumps are among the most environmentally friendly and efficient heating technologies available. In various countries, the electric mobiles like EV, PHEV, and FCEV, have been mainly concerned with heat pump with for new mobile markets. The experiments were conducted with various ambient temperature and coolant temperature as winter season. The system, coolant heat source heat pump, was consist of an inside heat exchanger, an outside heat exchanger, a motor driven compressor, an electronic expansion valve, and plumbing parts. Maximum, heating capacity and air discharge temperature are up to 6.3 kW and 62℃ respectively at ambient 10 ℃, coolant 10 ℃ conditions. However -20 ℃ ambient and -10 ℃ coolant temperature conditions are insufficiency to warm the cabin as 13 ℃ air discharge temperature.

자동차 실내 열부하 저감을 위한 태양에너지 응용기술 검토에 관한 연구

이대웅(Daewoong Lee),장길상(Gilsang Jang),오동훈(Donghoon Oh),조경석(Kyungseok Cho),김용철(Yongchul Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

The aim of this paper is to investigate solar energy application for reducing cabin thermal load. When the vehicle parked under the sun in summer, interior temperature is up to 70℃ which is depend on solar intensity. So, solar, one of the alternative energy considered as vehicle thermal comfort solutions, and conducted vehicle cabin thermal load accumulation with forced ventilation for solar energy simulation. Only operating of the air handling system blower by using external power supply, average temperature of cabin room reduced about over 10℃ to 20℃. Means, cabin thermal comfort is improved without extra energy consumption in the vehicle, and cool down performance of air-conditioning system will is better than current vehicle. Moreover fuel economy will be increased due to less air-conditioning system operating and have many opportunities of human advantage such as minimized VOCs by suppling clean air to cabin and healthy cabin environment by dehumidification of evaporator.

태양에너지 이용 자동차 공조시스템의 주차환기에 관한 연구

장길상(Kilsang Jang),김학준(Hakjun Kim),이대웅(Daewoong Lee),오동훈(Donghoon Oh) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5

In this study the performance of pre-ventilation using solar cell in vehicle sunroof was investigated. The vehicle pre-ventilation system is composed of solar cell, DC/DC converter, solar-powered blower, HVAC air duct and Cabin. HVAC blower is blowing ambient air into the interior of the vehicle. With this pre-ventilation the cabin thermal load is reduced. Both test and simulation were conducted to validate the analysis. The simulation model was established with the component models and system modeling approach using simulation tool. The simulation results are compared with measured data, and the simulated room temperature shows good agreement with the measured data after two times calibration. Using the validated model, the pre-ventilation performance was analysed at 40W solar cell capacity. The results will be used for the design of solar pre-ventilation system.

클라이언트-서버 기반 의약품 인식을 위한 휴대기기 어플리케이션 개발에 관한 연구

강승태(Seungtae Kang),이상원(Sangwon Lee),박지호(Jiho Bak),김민수,오동훈(Donghoon Oh),이장원(Jangwon Lee),장길진(Gil-Jin Jang) 한국통신학회 2018 한국통신학회 학술대회논문집 Vol.2018 No.6