측창 및 온실 폭이 자연환기 성능에 미치는 영향

이현우,우영회,이종원,Hyun Woo Lee,Young Hoe Woo,Jong Won Lee 국립한국농수산대학교 교육개발센터 2023 현장농업연구지 = Journal of practical agricultural resear 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.

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.

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 (J Chest Surg) 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.

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.

生血潤膚飮加味方이 아토피 피부염을 유발한 동물모델의 각질층 기능회복에 미치는 영향

이현우,구영희,최인화,Lee, Hyun-woo,Ku, Young-hui,Choi, In-hwa 대한한방안이비인후피부과학회 2003 한방안이비인후피부과학회지 Vol.16 No.1

Introduction and Objectives : Applying the saingheylyunbooemgami(SY) extract on to the atopic dermatitis(AD) is to study change of external dermal formation, change of leukocytes in vasculature, change of lipid formation in stratum corneum and distribution of ceramide and this study is done through forcing injury to rat's back skin which are lipid protect formation in stratum corneum. Materials and Methods : The AD which caused intentionally using the external application on the rat's back skin was used the SY. The change of leukocytes in vasculature has been identified through optima 5.2 and student t-test and the results were made into dermal foramtion graph. Results : After dispensing SY extract into the AD, the dermal injury was decreased, Especially, recover of lipid protection formation which include lipid and ceramide in stratum corneum is suppressing acute inflammation that some factors are PKC, TNF-${\alpha}$, lL-12B which controled the secretion of relating inflammatory cytokine, also went onto decrease of angiogenesis, and the decrese of degranulated mast cell. In addition, the decrease of epithelial injury also caused the growth of cell to decrease in stratum basale and cytoclasis. In the vasculature. the leukocytes were also decreased and it could relate to decrease AD. Conclusions : Thus. SY has effect on AD suppressing the dermal injury through recovering of lipid protection formation in stratum corneum.

보호구간이 없는 OFDM-CDMA 시스템의 성능 향상 기법

이현우,박중후,Lee Hyun-Woo,Park Joong-Hoo 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.5a

보호구간이 없는 Orthogonal Frequency Division Multiplexing-Code Division Multiplexing Access(OFDM-CDMA) 시스템을 사용하면 보호구간이 있는 OFDM-CDMA 시스템보다 대역폭 효율을 향상시킬 수 있다. 보호구간이 없는 OFDM-CDMA 시스템에서 Inter-Symbol Interference(ISI)와 Inter-Carrier Interference(ICI)를 제거하는 새로운 기법을 제안한다. 제안된 알고리즘은 Pseudo-Decorrelator에 기초하는 보호구간이 없는 OFDM-CDMA 시스템의 복조 기법이며, PD 알고리즘이라고 부르기로 하자. 모의실험 결과는 PD 알고리즘이 보호구간이 없는 OFDM-CDMA 시스템에서 ISI와 ICI를 효과적으로 제거할 수 있음을 보여준다. PD 알고리즘은 기존의 보호구간이 없는 OFDM-CDMA 시스템보다 좋은 BER 성능을 나타낸다. Orthogonal frequency division multiplexing-code division multiplexing access(OFDM-CDMA) systems without guard interval can enhance the bandwidth performance more efficiently than the systems with guard interval. In this paper, a new technique for an OFDM-CDMA system without guard interval, which can eliminate inter-symbol interference(ISI) and inter-channel interference(ICI), is presented. The proposed algorithm is a new demodulation technique, based on the Pseudo-Decorrelator, and it is named PD algorithm. Simulation results show that the PD algorithm can combat ISI and ICI efficiently for an OFDM-CDMA system without guard interval. The BER performance of the PD algorithm is much better than that of a conventional OFDM-CDMA system without guard interval.

16~18세기 영·호남 누정에 깃든 문화경관의 의미론적 해석 - 지정 문화재를 중심으로 -

이현우,Lee, Hyun Woo 국립문화재연구원 2012 헤리티지:역사와 과학 Vol.45 No.1

본 연구는 국가지정 또는 시도지정 문화재 중 총 22개의 영 호남 소재 누정을 중심으로 16~18세기 명리를 등지고 초야에 은거한 사림(士林)의 누정 문화를 고찰함으로써, 조영자의 자연관과 누정건립 등의 문화형성과정에서 축적된 미의식을 구명하고자 하였다. 특히 본 연구에서는 개별 누정에 작용된 의미론적 경관특성을 밝히기 위한 제안으로 '풍수적 입지 누정명 분석 누정문학 분석' 등의 해석을 시도하였다. 본 연구를 통해 확인된 주요 결과는 다음과 같다. 누정의 '입지[風水] 명칭[懸板] 문학[板上詩]' 등의 분석 및 해석 결과를 토대로 한국 누정만이 갖는 특수성을 논한다면, 누정의 입지는 풍수가 지향하는 목표와 일맥상통함이 확인되었는데, 이는 땅의 모양(物形)을 의미론적 풍수형국으로 해석함으로써 은유적이면서도 풍자적으로 '터잡기' 한 특징에서도 잘 드러나고 있다. 특히 풍수형국론(風水形局論) 관점에서 본 누정의 입지는 배산임수의 요건을 모두 충족했으며, 지향했던 전형적인 좌향은 남동향임이 확인되었다. 또한 땅의 모양에 대한 직관적이거나 자연론적인 표현보다는, 서로 다른 의미를 부여하여 은유적이면서도 풍자적으로 표현함으로써, 전통적 경관짜임의 특징을 형이상학적인 해학(諧謔)으로까지 승화시키고자 하는 보편성이 발견된다. 더 나아가 누정의 입지를 광역적 경관인식 체계로 본 의미론적 낙토(樂土) 개념이 표출되고 있다. 한편 누정명은 누정이 위치한 서로 다른 개별적 경관을 응축함으로써 상정된 의미론적인 어휘였다. '누정명의 어의 분석'에서 가장 높은 빈도를 보인 것은 주변경관을 간명한 어휘로 함축한 것인데, 그 특징은 첫째 '자연예찬(自然禮讚)' 즉 승경(勝景) 및 사시경물(四時景物)에 대한 흥취, 둘째, '유가사상(儒家思想)'과 관련된 경서(經書) 문장(文章) 성리학적 가치관 중국의 고사성어, 셋째, '선현칭송(先賢稱頌)'에 관한 상고성(尙古性), 넷째, 유유자적과 안빈낙도의 전형으로 청빈하지만 자존적인 삶의 '풍류(風流)', 다섯째, '도가사상(道家思想)'과 관련하여 좌절된 자아를 달래기 위한 치유수단으로써의 '선경(仙境) 갈구' 등이 깊이 내포되어 있었다. 특이하게도 16세기 초반까지는 유가사상에 기반을 둔 명칭이 주류를 이루었지만, 16세기 중반을 넘기며 '자연예찬 및 선현칭송'의 제재가 증가하면서 유가사상에만 편중되지 않는 제재 상의 다양성을 보여준다. 이와 함께 문학이란 예술장르를 빌어 아름다운 자연에 비긴 작가의 심상을 투영시킴으로써 내면의 문제를 완곡히 토로한 누정문학의 주요한 특성으로는 '자연예찬 풍류 도가사상 및 유가사상 선현칭송' 등의 보편성과 '우국충정 연군지정 과거회상' 등의 키워드가 도출되었다. 그러나 이 당시 팽배했던 '성리학적 유교관'에도 불구하고 누정문학을 주도한 일의적(一意的) 개념이 '자연예찬 및 풍류'였음은 매우 주목할 만하다. This research has studied the building awareness of Nu-Jeong that a view of nature and aesthetic consciousness to unite the nature are inherent by considering Nu-Jeong of scholars who left fame and wealth behind and retired to hermitage in the backwoods in the 16~18 Century. This is to clarify correlation with leaving nature as it is, namely, an ideal state that scholars at the time would enjoy, through landscape awareness accepted into Nu-Jeong literature. In addition, this research has tracked the ideologic flow that acts on space formation by clarifying Korean unique meanings inherent to Nu-Jeong's cultural landscape. As a suggestion for this, the interpretation through 'Pungsu location Nu-Jeong name's analysis Nu-Jeong literature analysis', etc. was tried, so its integrated conclusion is as follows. It is not a chance that scholars of Joseon have left numerous literature works singing the nature. They already had huge interest and knowledge on the nature, and achieved active poetic exchange by sublimating the praise of nature as literature. Nu-Jeong, which was a place of exchange like this, had cleanliness of the nature and ideological purity as an oppositional space on turbid political realities. The Nu-Jeong literature drew the nature into a literature space as it is, without doing abstraction or ideation on the nature. The owner of Nu-Jeong exclusively possessed such natural landscape in grim and independent postures, so it provided a clue of Nu-Jeong cultural landscape that this research aimed to discuss. Scholars who aimed to raise wide and large vigor filled in between the sky and earth got to convince that people are born from the nature, grow in the nature and finally return to the nature. What people are born from the nature and finally return to the nature is just consistent with Taoistic and Zhua-ngzi thoughts denying human work, and leaving nature as it is or nature itself remained intact which is an ideal state. The construction at the time is a vessel containing the spirit of the times of the era. This thesis has proved that the Nu-Jeong culture of scholars located on the central line of Korean landscape was the flower of Joseon's scholar culture by interpreting it semantically.

연구논문 : 와이블과정을 응용한 신뢰성 성장 모형에서의 MTBF 추정

이현우,김재주,박성현 ( Hyun Woo Lee,Jae Joo Kim,S . H . Park ) 한국품질경영학회 1998 한국품질경영학회 학술대회 Vol.1998 No.12

건축물 설계변수의 상관관계 분석을 통한 CO₂ 배출저감 방안

이현우,채민수,Lee, Hyun-Woo,Chae, Min-Su 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.1

This study proposes a $CO_2$ emission reduction method through correlation analysis of a sample building. First, energy saving factors of heating, cooling, lighting were determined for the correlation analysis and $CO_2$ emission contribution rate of the design parameters have been analyzed. Then optimal combination of each design parameter has been drawn. Heat transfer coefficient of walls and windows, air permeability, windows area ratio, and shading devices were selected as applicable energy saving factors of the sample building. Also computer simulation was conducted using experimental design by Orthogonal Arrays of the statistical method. And the contribution rate was estimated by Analysis of Variance-ANOVA. As a result, the $CO_2$ emission in heating was reduced to 51.9%; in cooling to 16.8%; and in lighting to 2% compared to the existing building. The majority of the reduction was presented by heating energy.

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.