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무인기 탑재 장비 간 상호 EMI를 고려한 효율적인 안테나 배치 방안
김춘원(Choon-Won Kim),김지훈(Ji-Hoon Kim),권경일(Kyoung-Il Kwon),정덕조(Deok-Cho Chung) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.10
본 논문에서는 무인기에 탑재되는 장비간의 EMI(Electromagnetic Interference)를 고려한 효율적인 안테나의 배치방법을 제안하였다. 분석은 무인기에 사용되는 장비 중에서 인접한 주파수 대역을 사용하는 음성통신 무전기, 제어용 데이터링크, TCAS(Traffic Alert Collision & Avoidance System)와 GPS(Global Positioning System)에 대하여 이루어졌다. 분석 방법은 두 단계로 구성되며, 첫 번째 단계는 안테나 장착 시 무인기 구조물에 의한 안테나 복사패턴과 반사손실 특성 변화를 관찰하여 양호한 특성을 나타내는 지점을 선정하는 것이며, 두 번째 단계는 안테나간의 결합특성과 장비의 송신 스펙트럼을 고려하여 장비간의 간섭 정도를 분석하는 것이다. 이러한 분석 과정은 개발단계에서 장비 간 EMI를 예측하여 대책을 수립할 수 있는 도구로 사용될 수 있다. This paper presents An efficient method of antenna placement considering EMI(Electromagnetic Interference) between equipments which are mounted on the UAV(Unmanned Air Vehicle). The analysis is accomplished for voice communication radio, control datalink, TCAS(Traffic Alert Collision & Avoidance System) and GPS(Global Positioning System) which are vulnerable to EMI because the frequencies are close to each other. There are two steps for analysis procedure : The first one is selecting antenna position on the UAV by monitoring return loss and pattern variation of each antenna. The second one is analyzing EMI via antennas between equipments. In the EMI analysis, spurious level of each transmitter, coupling level between antennas and system noise property are considered. This procedure can be used to predict EMI between equipments in development stage.
비임균성 뇨도염 환자에서 Chlamydia trachomatis 검출방법에 관한 연구 (배양법, 효소면역법 및 직접면역형광법의 비교 관찰)
최태열,김춘원,김중환,Choi, Tae-Yeal,Kim, Choon-Won,Kim, Jung-Hwan 대한미생물학회 1986 大韓微生物學會誌 Vol.21 No.3
Chlamydia trachomatis is one of the most common cause in non-gonococcal urethritis. There are several diagnostic methods for Chlamydia trachomatis; culture method using McCoy cell, enzyme immunoassay and direct immunofluorescence staining etc. We have studied a sensitivities of culture, chlamydiazyme and direct immunofluorescence staining(DIF). 85 male patients previously conformed to non-gonococcal urethritis have been selected in this study. Three samples were concurrently collected in the same patient. First sample was used to inoculation in McCoy cell, 2'nd sample was used to Chlamydiazyme test and 3'rd sample was used to direct immunofluorescence staining method. The results are following. 1. All culture, Chlamydiazyme and DIF positive cases are 15/85(17.7%). 2. Culture and Chlamydiazyme positive but DIF negative cases absent. 3. Culture and DIF positive, but Chlamydiazyme negative cases are 2/85(2.4%). 4. Chlamydiazyme and DIF positive, but culture negative cases are 9/85(10.6%). 5. Culture positive, but Chlamydiazyme and DIF negative cases are 6/85(7.1%). 6. Chlamydiazyme positive, but culture and DIF negative cases are 7/85(8.2%). 7. DIF positive, but culture and Chlamydiazyme negative cases are 3/85(3.5%). 8. All culture, Chlamydiazyme and DIF negative cases are 43/85(50.1%). In summarized, anyone positive cases of culture, Chlamydiazymc and DIF are 42/85(49.9%).
보행자 사고시 상해감소를 위한 자동차 후드 및 범퍼 구조물의 설계
이재완(Jae-Wan Lee),김춘원(Choon-Won Kim),박경택(Kyung-Taek Park),박경진(Gyung-Jin Park) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Although the numbers of pedestrian fatalities and injuries are steadily declining worldwide, pedestrian protection is still an important issue. Extensive researches have been carried out in the fields of pedestrian protection in order to establish pedestrian safety regulations. The automobile hoods and bumpers, which pedestrians frequently run into during accidents. should be designed safely for pedestrians. Two analysis methods are utilized to design safe structures of the hood and the bumper. They are real experiment and computer simulation. In this research, a method is developed to simultaneously use in respect of experiment and simulation. Orthogonal arrays are employed to combine the two methods. Based on this method, a hood and a bumper are designed to protect pedestrians.
?티스속 근경과 탈지된 크로톤 종자의 혼합 추출물(CP-2)이 수종 암세포에 대한 세포독성의 효과
김춘원,서경원,조영호,홍은경,한영복,문정조,경홍기,김정한,김종배 中央醫學社 1993 中央醫學 Vol.58 No.3
In order to develop anti-cancer drug with strong anti-cancer activity without side effects, we extracted by various steps from the mixture of Coptis chinensis (CO) and Croton tiglium L (CR), and evaluated it by measuring the cytotoxicity against various tumor cell-lines including normal spleen and thymus cells. Five murine cell lines including leukemia L-1210 and 9 human tumor cell lines including leukemia HL-60 derived from various organs such as stomach, liver, lung, colon and breast cancers were used. The cytotoxicity were measured by the well-known colorimetric [3-(4,5dimethylthiazol-2-yl)2,5 -diphenyltetrazolium bromice] (MTT) assay. The extract (CP-2) from the mixture of CO and CR were very effective to all tumor cell lines with different degrees but showed no significant effects on normal spleen and thymus cells. Specially stomach SNU-1, lymphoma Raji and colon SNU-C2A compared with others showed very strong cytotoxicity; 60? 80 %, 55 ?96 % and 40~80 %, within the range of 10 ~45 ?g/ ml, 10 ~90 ?g/ml and 55 ~96 ?g/ml of the extract (CP-2) respectively. The range of ID50 values were from 4.4 ?g/ml in lymphoma Raji to 350 ?g/mi in liver HEP-3B, which were relatively low compared with other natural crude extracts reported elsewhere.