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FFS 모드에서 표면 엥커링에너지에 따른 전기광학특성의 연구
유인호,총첸신,장원근,이명훈,이승희,Yu, In-Ho,Zhong, Zhen-Xin,Jang, Won-Gun,Lee, Myong-Hoon,Lee, Seung Hee 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.11
Liquid crystal (LC) alignment using a photoalignment method by irradiation of polarized ultraviolet (UV) on an alignment layer has been investigated. Photoalignment method exhibits weaker anchoring energy than rubbing method so that we have studied electro-optic characteristics of fringe-field switching (FFS) mode with alignment layers using the photo and rubbing alignment methods. The cell using photo alignment layer shows lower threshold and operation voltage than those using rubbed alignment layer. Also, the former method shows higher transmittance than that of the latter.
유인호 ( Yu In Ho ),김문기 ( Kim Moon Ki ),윤남규 ( Yun Nam Kyu ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-
This paper shows how the environmental parameters(temperature, humidity) in the greenhouse are influenced by air movement produced by air circulation fans. When the fans were used, they could make indoor temperature and humidity homogenious, but there was no significant difference in the location and number of fans. When the fans were not used during the night time, there was no significant difference in the temperature and humidity, but the standard deviation was reduced by using the fans.
순환팬이 온풍난방 온실의 기상분포 균일화에 미치는 영향
유인호(In Ho Yu),조명환(Myeong Whan Cho),이시영(Si Young Lee),전희(Hee Chun),이인복(In Bok Lee) (사)한국생물환경조절학회 2005 생물환경조절학회지 Vol.14 No.2
이 연구는 순환팬에 의해 만들어지는 수평적인 공기 흐름이 환경요인들의 수평 및 수직분포에 미치는 영향을 조사하기 위해 수행하였다. 순환팬 가동 유무에 따라 기류 속도, 기온, 상대습도 및 CO₂ 농도의 3차원 분포를 측정하였다. 온실내 기상인자 분포의 균일성은 외기온이 낮아짐에 따라 감소하였다. 무처리시 기온 편차는 4.7, 습도 편차는 19%이었는데 팬을 가동한 경우 그 편차들은 각각 2.2, 6.3%로 감소하였다. 팬 용량이 증가할수록 측점간 기온 편차가 줄어들었는데, 온실 바닥면적당 0.0104㎥ 용량의 팬으로 온실내 적정한 공기 유동을 만들 수 있었다. 기온 및 CO₂ 농도의 수직분포는 높이나 팬 용량에 관계없이 상당히 균일한 것으로 나타났다. 폭 방향의 기온 편차를 줄일 수 있는 팬 배치와 소용량의 팬을 다수 설치했을 때의 효과에 대한 연구가 더 필요할 것으로 생각된다. This study was conducted to investigate the effects of horizontal air flow produced by circulation fans on horizontal and vertical profiles of meteorological factors. The three-dimensional distributions of air speed, air temperature, relative humidity and carbon dioxide (CO₂) concentration were measured with and without the fans in operation. The uniformity of the spatial distribution of meteorological factors decreased as the outside air temperature decreased. In "fans off" condition, spatial variations of 4.7℃ in air temperature, 19% in relative humidity were detected. When the fans were operated, these variations were reduced to 2.2 and 6.3%, respectively. As the fan capacity increased, the difference in air temperature among sampling points decreased. The fan capacity of 0.0104 ㎥ㆍs?¹ㆍm?² was enough to obtain a reasonable air flow in greenhouse. The vertical profiles of air temperature and CO₂ concentration were reasonably uniform regardless of measurement height and fan capacity. Further researches on the position of fans to reduce the difference in air temperature along the width and the effects of using a larger number of smaller fans are required.
유인호(In Ho Yu),이응호(Eung Ho Lee),조명환(Myeong Whan Cho),류희룡(Hee Ryong Ryu),김영철(Young Chul Kim) (사)한국생물환경조절학회 2012 생물환경조절학회지 Vol.21 No.4
본 연구에서는 토마토 재배에 적합한 규격을 가지면서 기상재해에 안전한 토마토 재배용 연동 비닐하우스를 설계하였다. 토마토 하우스의 규격은 폭 7m, 측고 4.5m, 동고 6.5m이다. 1995년에 농촌진흥청에서 개발한 1-2W형 하우스와 비교해서 폭은 같지만 측고는 1.8m, 동고는 2m 더 높다. 중방은 작물하중과 장치하중을 견딜 수 있도록 트러스 구조로 설계하였다. 토마토 하우스는 높으면서도 내재해 설계 기준(MIFFAF, 2010)에 맞게 만들어졌다. 즉, 최고 설계 기준인 풍속 40m · s<SUP>?1</SUP>, 적설 40㎝ 이상에 안전하도록 구조안전성분석을 통해 하우스 기둥, 서까래 등의 부재 규격과 설치 간격을 설정하였다. 1-2W형 하우스와 달리 토마토 하우스에는 랙-피니언 타입의 천창을 용마루 부분에 설치하여 외부 공기 유입과 자연 환기를 극대화할 수 있도록 하였다. 하우스 높이가 증가하면 난방비는 증가하므로 토마토 하우스에는 보온력이 우수한 다겹보온커튼을 설치하여 하우스 바깥으로 빠져나가는 열을 최소화하였다. This study aimed to develop the multi-span plastic greenhouse which is suitable for tomato cultivation and is safe against climatic disasters such as typhoon or heavy snow. The width and heights of eaves and ridge of newly developed tomato greenhouse are 7, 4.5 and 6.5 m, respectively. The width is the same but the eaves and ridge heights are 1.8 and 2 m higher than conventional 1-2 W greenhouses, respectively. Cross beam has been designed as a truss structure so it can sustain loads of tomato and equipment. Tomato greenhouse has been designed according to climatic disaster preventing design standard maintaining the high height. In other words, the material dimensions and interval of materials including column and rafter have been set to stand against 40 m · s<SUP>?1</SUP> of wind and 40 ㎝ of snow. Tomato greenhouse has been equipped with rack-pinion type roof vents which have been used in glass greenhouse in order to prevent excessive rise in air temperature. This vent type is different from that of 1-2 W type greenhouse which is made by rolling up and down the vinyl at upper part of column. Roof vents are installed at ridge, and thus external air inflow and natural ventilation are maximized. As the height increases, heating cost increase as well and, therefore, tomato greenhouse has been equipped with multi-layered thermal curtain, of which thermo-keeping is excellent, to prevent heat from escaping.
유동팬이 설치된 온실 내 기류 및 기온분포 해석을 위한 CFD 모델 개발
유인호(In-Ho Yu),윤남규(Nam-Kyu Yun),조명환(Myeong-Whan Cho),류희룡(Hee-Ryong Ryu),문두경(Doo-Gyung Moon) 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.4
This study was conducted to build the CFD simulation model which can quantify the distribution of the meteorological factors in air-heated greenhouse for chrysanthemum according to the location and capacity of air-circulation fan. The CFD model was also verified by experiment. It was judged that SST model was the most appropriate turbulence model which can properly describe the airflow by the air-circulation fan. According to the simulation results, the differences between the measured and predicted temperatures from 18 points at each height in the greenhouse were 0.2~0.4℃ in average. This showed a good agreement between the predicted data and the measured ones. The developed CFD model can be a useful tool to evaluate and design the air-circulation systems in the greenhouse with various configurations.
간척지에 플라스틱 온실 설치 시의 문제점 분석 및 개선방안
유인호(In-Ho Yu),구양규(Yang-Gyu Ku),조명환(Myeong-Whan Cho),류희룡(Hee-Ryong Ryu),문두경(Doo-Gyung Moon) 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.4
Upon setting up a dedicated plastic greenhouse for tomato cultivation developed by the Rural Development Administration on the Gyehwa reclaimed land, this study was aimed at analyzing the problems can be occurred in the installation of plastic greenhouse on reclaimed lands as well as finding out solutions for improvement. A relatively cheaper wooden pile was used in the installation in order to supplement the soft ground conditions. Based on the results of ground investigation of the installation site, both the allowable bearing capacity and pulling resistance of the wooden pile with a diameter of 150 mm and a length of 10 m were computed and came out to be 30.645 kN. It was determined that the values were enough to withstand the maximum compressive force (17.206 kN) and the pullout force (20.435 kN) that are generally applied to the greenhouse footing. There are three problems aroused in the process of greenhouse installation, and the corresponding countermeasures are as follow. First, due to the slightly bent shape of the wooden pile, there were phenomenon such as deviation, torsion, and fracture when driving the pile. This could be prevented by the use of the backhoe (0.2) rotating tongs, which are holding the pile, to drive the pile while pushing to the direction of the driving and fixing it until 5 m below ground and applying a soft vibrating pressure until the first 2 m. Second, there exists a concrete independent footing between the column of the greenhouse and the wooden pile driven to the underground water level. Since it is difficult to accurately drive the pile on this independent footing, the problem of footing baseplate used to fix the column being off the independent footing was occurred. In order to handle with this matter, the diameter of the independent footing was changed from 200 mm to 300 mm. Last, after films were covered in the condition that the reinforcing frame and bracing are not installed, there was a phenomenon of columns being pushed away by the strong wind to the maximum of 11 m?s-1. It is encouraged to avoid constructions in winter, and the film covering jobs always to be done after the frame construction is completely over. The height of the independent footing was measured for 9 months after the completion of the greenhouse installation, and it was found to be within the margin of error meaning that there was no subsidence. The extent to the framework distortion and the value of inclinometers as well showed not much alteration. In other words, the wooden pile was designed to have a sufficient bearing capacity.