측창 및 온실 폭이 자연환기 성능에 미치는 영향

이현우,우영회,이종원,Hyun Woo Lee,Young Hoe Woo,Jong Won Lee 국립한국농수산대학교 교육개발센터 2023 현장농수산연구지 Vol.25 No.1

In summer, the natural ventilation performance for varying greenhouse width is very important in the glasshouses for year round cultivation. The effect of the side openings and greenhouse width on natural ventilation performance was analyzed by simulation. The necessary ventilation rate with different solar radiation transmittance increased significantly when the outside temperature grows higher. The necessary ventilation rate of 40% transmittance was about half of that of 90% transmittance. In consequence, shading effect on temperature control in greenhouse is significant in summer. When the total area of the openings for ventilation is constant, the maximum ventilation rate happens when the area of roof openings is equal to the area of side openings. This maximum ventilation rate is about 3 times of that of the greenhouse with roof openings and without side openings. Therefore, the side openings are advantageous to improve the natural ventilation in greenhouses. As the greenhouse width increases, the influence of side openings on the ventilation rate is becoming smaller. If the natural ventilation rate of the greenhouse with roof and side openings is to become double of that of the roof openings only, the width should be narrower than 38.4m for the Venlo type and 64m for Wide span type.

관상동맥우회 이식편으로서의 우위대망동맥의 조직학적 특징

이현우,송현,유동곤,임한중,이재원,송명근,Lee, Hyun-Woo,Song, Hyun,Yoo, Dong-Gon,Lim, Han-Jung,Lee, Jae-Won,Song, Meong-Gun 대한흉부심장혈관외과학회 1999 Journal of Chest Surgery Vol.32 No.10

Long term patency of arterial graft has been better than venous graft and redo coronary artery bypass grafting has been increasing, therefore, there has been an increasing need for alternative arterial grafts except internal thoracic artery(ITA). Material and Method: Right gastroepiploic arteries(RGEA) were harvested from 100 patients who had received gastrectomy for gastric cancer or ulcer. ITAs were obtained from 10 patients undergoing coronary artery bypass grafting. The length of RGEA was measured from the pyloric ring. Items of the morphometric and histologic study at the pyloric ring and sites of the 10cm and 20cm RGEA from the pyloric ring were luminal diameter, intimal thickness, medial thickness, wall thickness, degree of intimal hyperplasia, intimal thickness, medial thickness, wall thickness, degree of intimal hyperplasia, intimal thickness index, medial thickness index, and the number of discontinuities of the internal elastic lamina. Similar items were applied to the proximal site of ITAs. Result: The length of RGEA was 23${\pm}$2.7cm(range 17∼31cm). Comparing the 20cm RGEA with ITA, intimal thickness, medial thickness, wall thickness, and degree of intimal hyperplasia did not show any difference(p>0.05). However, 20cm RGEA was greater than ITA at the luminal diameter, intimal thickness index, and the number thickness and wall thickness in each site of the RGEA(pyloric ring, 10cm, 20cm) decreased from the pyloric ring to the distal sites(p<0.05). The degree of intimal hyperplasia and the number of discontinuities of the internal elastic lamina did not show any difference between the pyloric ring and 10cm, however, those of 20cm were smaller than these sites(p<0.05). RGEA had more number of discontinuities of the internal elastic lamina and rich smooth muscle cells in the media than ITA. Conclusion: The length and diameter of RGEA is good enough to reach most of the coronary arteries. Moreover, long term patency of RGEA may be improved, if anastomosed in the distal site.

석재가공용 다이아몬드 톱의 제조 및 특성

이현우,전우용,이오연,설경원,Lee Hyun-Woo,Jeon Woo-yong,Lee Oh-yeon,Seol Kyeong-won 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.5

The purpose of the present study is to determine an optimum composition using cheaper powders keeping with high performance of hard rock cutting diamond saw blade. With 50Fe-20(Cu . Sn)-30Co specimen, a part of Co was replaced by Ni(5%, 10%, and 15%, respectively). These specimens were hot pressed and sintered for predetermined time at various temperature. Sintering is performed by two different methods of temperature controlled method and specimen dimension controlled method. In order to determine the property of the sintered diamond saw blade, 3 point bending tester, X-ray diffractometer, and SEM were used. As the Co in the bond alloy was replaced by Ni, the hardness of the specimen increased. Thus the 50Fe-20(CuㆍSn)-15Co-15Ni specimen showed the maximum hardness of 104(HRB). The results of 3 point bending test showed that flexure strength decreased along with increase in Ni content. This is attributed to the formation of intermetallic compound(Ni$_{x}$Sn) determined by X-ray diffraction. The fracture surface after 3 point bending test showed that diamond was fractured in the specimen containing 0%, 5%, and 10%Ni, and the fracture occurred at the interface between diamond and matrix in the specimen containing 15%Ni. The cutting ability test showed that the abrasive property was not changed in the specimen containing 0%, 5%, and 10%Ni. The optimum composition determined in this study is 50Fe-20(CuㆍSn)-20Co-10Ni.

서초동(서울시 서초구)의 거미상

김주필(Joo Pil Kim),정혜리(Hye ri Jeong),김대희(Dae Hee Kim),박동우(Dong Woo Park),서재웅(Jae Woong Seo),이현우(Hyun woo Lee) 한국거미연구소 2017 한국거미 Vol.33 No.1

2016년 3월 31일부터 7월 31일까지 서울특별시 서초구 서초동에 위치한 서울고등학교 교정 일대를 서울고등학교 환경생물부 부원들이 채집 조사한 결과 20과 43속 53종의 거미가 조사 연구되어 이에 보고하는 바이다. From March 31st to July 31st in 2016, members of an environmental biology club at Seoul High School located in Seocho-gu, Seoul, Dae-Hee Kim, Dong-Woo Park, Jae-Woong Seo and Hyun-woo Lee, collected 20 families 43 genera 53 species of spiders and report the result of the study here.

거창 고학리 해주오씨의 장소애착을 통해 본 종족경관의 형성과정

이현우,Lee, Hyun-Woo 한국조경학회 2013 한국조경학회지 Vol.41 No.5

경남 거창군 마리면 고학리에 소재한 용원정원림(龍源亭園林) 및 마을주변의 지명과 조형물 등 문화경관적 요소들에 대한 분석과 해석을 토대로 용원정원림과 마을 내 배태(胚胎)된 해주오씨의 장소애착 방식과 특질을 확인하는 한편, 종족경관(宗族景觀)의 형성과정을 추찰하고자 한 본 연구의 결론은 다음과 같다. 해주인 구화공 오수(九華公吳守)가 마을에 터 잡은 이래 그의 후손들이 선조를 사모하는 마음으로 다듬어 온 공간으로 1964년 용원정이 건립되었다. 이곳은 구화공의 유허지로 이후 후손들의 생활과 풍류의 거점이자 숭모(崇慕)의 정을 교감하는 원림적 장소로서 지속적으로 관리되어 왔음이 기문과 문헌자료 그리고 주변에 배치된 여러 시설 및 다수의 바위에 새긴 바위글씨를 통해서도 충분히 감지된다. 안의삼동 중 하나인 원학동의 지맥인 학봉(鶴峰)을 상징하는 고학리와 이곳에 각인된 '방학(訪鶴) 정학(停鶴)'의 의미는 해주오씨의 생태적 정착과 서식을 설명하는 경관언어가 분명하다. 장소성이 "어떤 실체로서 존재하기 보다는 담론과 실천에 의해 만들어지는 사회적 고안물이다"라는 정의를 상기할 때, 주변 지명과 용원정원림 그리고 마을 도처에 산재한 다수의 조영물은 한국적 장소성의 특성을 일목요연하게 보여주는 종족집단의 기념비적 장소 전승의 사례이다. 구화공이 고학리에 정착한 이래 해주오씨 종족집단은 서식지 정착단계를 거쳐 장소성 구현을 통한 경관형성단계를 이루었다. 이후 조상숭모와 장소착근 현상이 되풀이되면서 영역성은 확산되고, 장소의 재생산이 이루어졌다. 특히 일제강점기에도 재실 건립과 유허비 조성 등이 이어졌으며, 해방 이후에도 용원정 건립 등 장소재현의 단계를 거쳐 현재까지도 다양한 형태의 기념비적 종족경관이 펼쳐지고 있으며, 이러한 장소애착(場所愛着)과 장소착근(場所着根)의 결과가 바로 우리가 지각하는 '거창군 마리면 고학리의 종족경관'이라는 결론에 도달하게 된다. 종족집단의 장소애착과 장소착근의 현상이 되풀이되어 형성된 영역성 확산의 산물이야말로 종족경관의 실체인 것이다. 이를 통해 우리는 집단 기억 속에 재차 구축 전승되고 있는 고유한 장소에 대한 후손들의 진지한 관심과 사랑 그리고 진정한 장소애착의 정신을 확인하게 된다.

3G LTE and SAE

이현우,Lee Hyun-Woo 한국통신학회 2006 정보와 통신 Vol.23 No.6

영상처리기법을 이용한 CCT 시편 균열의 자동관측법에 관한 연구

이현우,문기태,오세종,정병우,Lee, Hyun-Woo,Mun, Gi-Tae,Oh, Se-Jong,Jeong, Byung-Woo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3

In the analysis of fatigue crack propagation behavior, the crack length is one of the most important factors. In the test of crack propagation, compliance method is widely used to detect crack length. The measurement of surface crack length is not so easy with compliance method. In this study, the image processing technique was applied to measure the surface crack length. CCD(Charge-coupled device) camera was used to observe the crack image and the computer program to detect crack length from stored crack image was developed. CCT(Center Cracked Tension) specimen was used to compare the compliance method with the image processing technique. The crack length which detected by the image processing techniques was found to be well consistent with that from the optical measurement.

소형화된 1.6 GHz 단일 채널 도플러 센서를 이용한 실시간 호흡 및 심장 박동 감지기

이현우,박일호,김동욱,Lee, Hyun-Woo,Park, Il-Ho,Kim, Dong-Wook 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.4

This paper presents a real-time respiration and heartbeat detector comprised of a 1.6 GHz single-channel Doppler sensor and analog/digital signal processing block for remote vital sign detection. The RF front end of the Doppler sensor consists of an oscillator, mixer, low noise amplifier, branch-line hybrid and patch antenna. We apply artificial transmission lines(ATLs) to the branch-line hybrid, which leads to a size reduction of 40 % in the hybrid, while its performance is very comparable to that of a conventional hybrid. The analog signal conditioning block is implemented using second order Sallen-Key active filters and the digital signal processing block is realized with a LabVIEW program on a computer. The respiration and heartbeat detection is demonstrated at a distance of 50 cm using the developed system.

영상처리기법을 이용한 CCT 시편 균열의 자동관측법에 관한 연구

이현우,문기태,오세종,정병우,Lee, Hyun-Woo,Mun, Gi-Tae,Oh, Se-Jong,Jeong, Byung-Woo 대한기계학회 1997 대한기계학회논문집 Vol.21 No.3

In the analysis of fatigue crack propagation behavior, the crack length is one of the most important factors. In the test of crack propagation, compliance method is widely used to detect crack length. The measurement of surface crack length is not so easy with compliance method. In this study, the image processing technique was applied to measure the surface crack length. CCD(Charge-coupled device) camera was used to observe the crack image and the computer program to detect crack length from stored crack image was developed. CCT(Center Cracked Tension) specimen was used to compare the compliance method with the image processing technique. The crack length which detected by the image processing techniques was found to be well consistent with that from the optical measurement.

자락요법과 고백반 도포로 호전된 급성 편도선염 소아환자의 임상연구

이현우,홍승욱,Lee, Hyun-Woo,Hong, Seung-Ug 대한한방안이비인후피부과학회 2012 한방안이비인후피부과학회지 Vol.25 No.1

Objectives : The purpose of this study is to research the effect of bloodletting therapy and Alunitum-spread at palatine tonsil in acute tonsillitis. Methods : We reviewed medical records of 61 young patients of acute tonsillitis who had taken bloodletting therapy and Alunitum-spread from May 2003 to March 2011 in Samsung oriental medicine clinic. Results : There were 39 boys and 22 girls. Between 5 and 6 years-old group was more than the others. Between 3 and 4 days group was the first in duration of disease. Winter was the first and then spring, fall and summer in distribution of season. Between 9 and 10 days group was 22 patients, which was the first in duration of treatment. it was the first to have no history of acute tonsilitis group, and then cold, allergic rhinitis, laryngopharyngitis, acute tonsillitis and tympanitis. There were 41 patients who came to Samsung oriental medicine clinic the first and then western clinic, home remedy and other oriental clinic. Sore throat was the first sympton and then runny nose, high fever, nasal congestion and cough in companied symptom. Conclusions : Bloodletting therapy and Alunitum-spread were useful to improve acute tonsillitis.