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연료전지 자동차용 R-134a 전동식 히트펌프 시스템 개발에 관한 연구
이준경,이동혁,원종필,Lee, Jun-Kyoung,Lee, Dong-Hyuk,Won, Jong-Phil 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.3
The main objective of this work is to investigate the characteristics of a heat pump system for fuel cell electric vehicle (FCEV). The present heat pump system adopts an electrically driven compressor running with R134a and uses the heat from the fuel cell stack as the heat source for the exterior heat exchanger. The experimental work has been done with various operating conditions such as different compressor speeds, fuel cell stack coolant temperatures and flow rates. The heating capacity was measured to be from 4 to 10 kW at $-20^{\circ}C$ ambient temperature, and the outlet temperature of interior heat exchanger was up to $70^{\circ}C$. After 30 seconds from start-up, the system reached a steady state and the heating capacity of 6.8 kW was acquired, and after 90 seconds, the air outlet temperature of interior heat exchanger became $35^{\circ}C$.
표준한방처방의 EBM 구축을 위한 갈근탕(葛根湯) 문헌 분석 연구
이준경,김정훈,신현규,Lee, Jun-Kyoung,Kim, Jung-Hoon,Shin, Hyeun-Kyoo 대한한의학방제학회 2011 大韓韓醫學方劑學會誌 Vol.19 No.1
Objectives : The purpose of this report was to provide the information of activity and safety of galgeun-tang by analyzing domestic/international papers and theses about galgeun-tang. Methods : Domestic/international papers and theses related to galgeun-tang were reviewed and analyzed. These papers were then classified by efficacy, or clinical trials. Results : The basic pharmacological experiment showed antipyretic, analgesic and anti-virus and anti-oxidant efficacy of galgeun-tang. In the case report of galgeun-tang, it showed therapeutic effect for patient with chronic rhinitis. But administration of galgeun-tang induced pruritic eruption in the two case report as a side effects of galgeun-tang. Conclutions : galgeun-tang showed tantipyretic, analgesic and anti-virus and anti-oxidant efficacy in the basic pharmacological experiment. Also, galgeun-tang showed therapeutic effect for patient with chronic rhinitis. But it was reported that galgeun-tang induced pruritic eruption in two case report, so physicians should be aware of the potential side effects.
연료전지 자동차용 CO₂ 전동식 냉방 시스템 개발에 관한 기초 연구
이준경(Jun Kyoung Lee),이동혁(Dong Hyuk Lee),이헌균(Heon Kyun Lee),원종필(Jong Phil Won),이형기,박창호 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The main objective of this work is to investigate the characteristics of the mobile air conditioning system for fuel cell electric vehicle (FCEV). The present air conditioning system for FCEV uses the electrically driven compressor for CO₂. The experimental work has been done with various operating conditions such as different compressor speed and high pressure to identify the characteristics of the system. Experimental results show that the cooling capacity was more than 3㎾ and coefficient of performance (COP) was more than 1.5, also.
다중 확산 부호를 사용한 DS-CDMA에 대한 주파수 선택적 페이딩 채널에서 주파수 영역 터보 등화 기법
이준경(Jun Kyoung Lee),이택주(Taekju Lee),채혁진(Hyuk Jin Chae),김동구(Dong Ku Kim) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.1C
무선 이동 통신에서 여러 가지 멀티미디어 서비스를 제공하기 위해서는 더 높은 수준의 전송률을 필요로 하게된다. DS-CDMA에서 전송률을 증가 시키는 방법으로 다중 확산 부호의 사용을 생각할 수 있다. 그러나 다중 경로 채널에서는 사용된 다중 확산 부호 간의 직교성이 파괴되어 코드 간 간섭을 일으키게 된다. 이 코드 간 간섭현상은 다중 확산 부호를 사용한 DS-CDMA의 비트 오류 성능(BER)을 크게 떨어뜨린다. 일반적인 다중부호 DS-CDMA 시스템은 레이크(Rake) 수신기와 터보 디코더를 사용하는데, 이 방법으로는 코드 간 간섭 현상(ICI)으로 발생되는 오류 마루(error floor)를 극복 할 수 없다. 본 논문에서는 다중 확산 부호를 사용한 DS-CDMA 시스템에 대하여 최소 평균 제곱 오류(MMSE)를 기반으로 한 주파수 영역 터보 등화 기법(FDTE-MMSE)을 제안하고 컴퓨터 시뮬레이션을 통하여 성능을 확인하였다. 시뮬레이션 결과에 따르면 다중 경로 채널의 길이가 1보다 클 경우, 높은 Eb/N?에서 FDTE-MMSE의 성능이 레이크 수신기와 터보 디코더를 결합하여 사용한 경우 보다 더욱 우수한 것으로 나타났다. The higher data rate of mobile communications has been required for various multimedia services. In DS-CDMA system, one of the solutions to increase the throughput is to use multicode. However, multipath channel destorys the orthogonality of spreading codes, which causes the intercode interference (ICI). ICI gives severe effect on multicode DS-CDMA for BER performance. Conventionally, multicode DS-CDMA system uses the Rake receiver with turbo code, which cannot overcome error floor caused by ICI. In this paper, we propose frequency domain turbo equalization based on minimum mean squared error (FDTE-MMSE) for multicode DS-CDMA in frequency selective channel and evaluate its BER performance by computer simulation. The simulation results show that FDTE-MMSE gives much better performance in high Eb/N? than the Rake receiver with turbo code in multipath length L>1.
채널과 커플러를 사용한 모듈식 구조체 우각부 연결구조의 성능검증 실험
이준경(Lee, Jun-Kyoung),이종순(Lee, Jong-Soon),이성형(Lee, Sung-Hyung),김희성(Kim, Hee-Sung) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.3
최근 저심도의 도시철도 시스템이 제안되어 지상고가 형식의 민원과 지하경전철 형식의 비경제성을 극복하기 위한 연구가 진행중이다. 본 연구에서는 저심도 지하구조물의 경제성과 시공성 확보를 위하여 가시설을 대체하는 프리캐스트 형 식의 모듈식 구조체를 적용하기 위하여 영구 강성벽체와 상부 슬래브간 연결부 조인트에 대한 구조적 성능을 검증하고자 실내 재하실험을 수행하였다. 성능재하 실험결과, 가시설 대체 강성벽체와 상부 슬래브간 연결부 구조는 휨모멘트 전달구조 임을 확인하였다. 특히 휨 지배를 받는 상부에서는 채널형태보다는 커플러 조합이 휨 저항 성능이 30%정도 증가하여 유리함 을 확인하였으나, 성능 개선이 필요한 것으로 확인되었다. Recent study about near-surface is proposed to overcome non-economic of underground railway and to reduce people’s complaints of ground elevated railway. In this report, precast modular structure system replacing temporary facilities is applied to ensure the construction ability and economic feasibility. To verify the performance of connection joint between permanent structural wall and upper slab, loading test is carried out. As a result of the test, wall replacing temporary structure to slab connection is possible to transfer bending moment. By 30% increase of bending resistant performance for connection joint using coupler, coupler connection joint is more advantageous to resist bending moment compared to channel connection.
헤더-채널 분기관의 각도변화가 2상 유동 분배에 미치는 영향에 대한 연구
이준경(Jun Kyoung Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.11
The main objective of this work is to experimentally investigate the effect of angle variation on the distribution of two-phase flow at header-channel junctions. The cross-sections of the header and the channels were fixed at 16 mm ×16 mm and 12 mm×1.8 mm, respectively. Air and water were used as the test fluids. Four different header-channel positions were tested:Vertical header with Horizontal channels (case VM-HC), Horizontal header with Horizontal channels (case HM-HC), Horizontal header with Vertical Downward channels (case HM-VDC), and Horizontal header with Vertical Upward channels (case HM-VUC). In all cases, liquid flow distribution tended to decrease gradually in the upstream header region. However, in the downstream region, different trends could be seen. The reason for these different tendencies were identified by flow visualization in each case. The standard deviations for the liquid and gas flow distribution in each case were calculated, and the case of VM-HC had the lowest values compared to other cases because of the symmetrically distributed liquid film and strong flow recirculation near the end plate.
사각 마이크로 채널 내 Taylor Flow의 기포 및 액체 슬러그 유동 특성에 대한 연구
이준경(Jun Kyoung Lee),이관근(Kwan Geun Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.10
The characteristics of gas-liquid Taylor (Slug) flow in a square micro-channel of 600×600 ㎛ were investigated experimentally in this paper. The test fluids were nitrogen and water. The liquid and gas superficial velocities were 0.01~3 m/s and 0.1~3 m/s, respectively. Bubble and liquid slug length, bubble velocity, and frequency were measured by analyzing optical images using a high speed camera. Bubble length decreased with higher liquid flow rate, which increased dramatically with higher gas flow rate. However, slug length did not vary with changes in inlet liquid conditions. Additionally, bubble velocities and frequencies increased with higher liquid and gas flow rates. It was found that measured bubble lengths were in good agreement with the empirical models in the existing literature, but slug lengths were not.