• 생물환경조절학회지
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• 제18권3호
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• pp.258-265
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• 2009

본 연구는 현재 대일 수출중인 상업적인 유리온실과 플라스틱 온실에서 파프리카 'Derby'를 공시품종으로 하여 국내 온실 간 생산량 차이 발생을 분석하여, 생산성 차이를 개선하고자 시설내부의 광량, 작물의 생장량 및 수량을 두 온실간 기간별로 비교 분석하였다. 재배기간 동안 평균 일중 광량은 유리온실 $9.03MJ/m^2/day$, 플라스틱 온실 $7.37MJ/m^2/day$로 23%정도 유리온실의 시설내부 광량이 많았다. 총 조사기간 동안 파프리카의 생장량은 유리온실 $1759.9g{\cdot}m^{-2}$, 플라스틱 온실 $1308.5g{\cdot}m^{-2}$으로 유리온실의 작물 생장량이 높았다. 총 건물생산량 대비 영양생장생식생장 기관의 건물분배는 시설내부 광량이 높은 유리온실에서 생식생장 기관의 건물분배는 높았고, 영양생장 기관의 건물분배는 낮았다. 두 온실의 파프리카 생산성은 유리온실 $14.1kg{\cdot}m^{-2}$, 플라스틱 온실 $7.8kg{\cdot}m^{-2}$으로 유리온실이 매우 높은 생산성을 보였다. 본 연구결과는 온실 간 파프리카의 기간별 동적인 건물생산량과 건물 분배 패턴, 수량을 분석함으로써 파프리카의 수량을 예측하고 우리나라 파프리카 생산성 향상을 위한 재배기술 분야의 기초 자료와 농가 간 생산성 차이 원인을 분석하고 그에 따른 생산성 극복 기술을 개발하는데 중요한 자료가 될 것이라고 판단된다.

• 생물환경조절학회지
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• 제28권4호
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• pp.388-395
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• 2019

The purpose of this study is to suggest structural model and analyze design factors for the development of small greenhouse standardization model. The average dimensions of small greenhouse desired by urban farmers were 3.3m in width, 1.9m in eaves height, 2.7m in ridge height, 5.7m in length. The cladding materials for small greenhouse were preferred to glass, PC board and plastic film, framework to aluminum alloy and steel, and heating method in electrical energy. In addition, it was analyzed that small greenhouses need to develop structural model by dividing them into entry-level type and high-level type. The roof type that was used for entry-level type was arch shape, framework was steel pipe, cladding material was plastic film. On the other hand, high-level type was used in even span or dutch light type, framework with square hollow steel, cladding materials with glass or PC board. In consideration of these findings and practicality, this study developed four types of small greenhouses. The width, eaves height, ridges height, and length of the small greenhouses of even span type, which were covered with 5mm thick glass and 6mm thick PC board were 3m, 2.2m, 2.9m, and 6m, respectively. The small greenhouse of dutch light type covered with 5mm thick glass was designed with 3.8m in with, 2.2m in eaves height, 2.9m in ridges height, and 6m in length. The width, eaves height, ridges height, and length of the arch shape small greenhouse covered with a 0.15mm PO film were 3m, 1.5m, 2.8m, and 6m, respectively.

• 농업과학연구
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• 제39권2호
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• pp.271-277
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• 2012

Dimensions, operation conditions and improvement items for round roof windows were investigated in arch shape single-span plastic greenhouse with roof vents, and natural ventilation performance was analyzed based on the ventilation theory. Diameter of round roof windows was mostly 60 cm, and chimney height projected on roof was average 30 cm. Installation space was mostly 5 to 6 m but farmhouse of 10 m and over was 16.7% also. A round roof window which has 60 cm diameter was installed to 6 m space generally and 80 cm diameter was installed to 10 m space, but correct standards did not exist. There were a lot of opinions that ventilation effect of round roof windows is fairly good and user satisfaction is generally excellent. It is problem that there is few effects in summer and that vinyl around each vent tears well and rainwater leaks, and improvement hope item required development of automatic control system. In the wind speed of 0.3 m/s, it was estimated that natural ventilation rates were 0.69, 0.55, 0.50 and 0.48 volumes per minute in case of 2, 4, 6 and 8 m installation space for round roof windows, respectively. It was analyzed that the ratio of ventilation due to buoyancy out of total ventilation were 65.2, 41.9, 29.9 and 22.8% in case of 2, 4, 6 and 8m installation space, respectively. By the round roof windows installed at space of 6 m, ventilation rate was estimated to 0.5 volumes per minute, and we can expect the increase in ventilation rate of 30%. In order to meet the recommended ventilation rate for summer season, we have to install the round roof windows at space of 1 to 2 m. However, it is difficult to apply those installation space because of falling productivity due to lower light transmittance as well as rising costs. It is estimated that the installation space of 6m is appropriate for spring or fall season. Therefore it is necessary to encourage installing the roof windows in single-span plastic greenhouses.

• 생물환경조절학회지
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• 제8권2호
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• pp.136-146
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• 1999

본 연구에서는 동절기 시설원예용 하우스의 열환경, 난방방식별 에너지 소비 특성, 하우스내 열이동 프로세스자 난방효율에 대해서 중점적으로 검토하였다. 동절기 하우스의 벽체, 지붕을 통해 손실되는 관류열량을 정량적으로 계산하므로서, 하우스의 단열계획 및 난방에너지 절약을 유도할 수 있는 기초데이터를 제시하였다. 난방방식별 실내외 온도차와 에너지 소비량과의 관계를 정량적으로 도출하므로서, 쾌적성, 경제성을 고려한 최적의 하우스 난방방식 선정과 난방기 운용의 효율화를 유도하기 위한 기초자료를 제시하였다 난방방식별 실내외 온도차와 에너지 소비량과의 관계로부터 도출된 결과는 심야전력 난방이 온풍난방에 비해 난방효율이 현저히 높은 것으로 나타났다. 덕트 주변의 수평 및 연직방향으로 다수의 열전대를 설치하여 온풍 난방시 덕트주변의 작물에 미칠 수 있는 고온피해 발생 가능성을 검토하였으나, 약 1$^{\circ}C$이내의 비교적 균일한 온도가 계측되므로서, 온풍에 의한 주변작물의 고온피해는 관측되지 않았다. 덕트 길이방향으로 일정간격마다 덕트내부에 열전대를 설치하여 덕트길이에 따른 온도하강 추이를 검토한 결과, 덕트 단위길이당 0.5~0.8$^{\circ}C$의 온도강하가 계측되었다.

• 생물환경조절학회지
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• 제16권1호
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• pp.72-77
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• 2007

참외의 저온기 무가온 시설재배에서 원적외선 흡수율이나 무적성 등의 물리적 특성을 향상시킨 필름 피복이 참외 과실품질에 미치는 영향을 조사하기 위하여 과실 성분을 조사하였다. 일반 PE필름과 기능성이 추가된 5가지의 필름을 5동의 하우스에 피복하여 성주지역 2곳에 각각 설치한 후 재배하였다. 하우스 내부 온도는 높은 적외선 흡수를 보였던 필름인 J-1과 J-2에서 K-3에 비해 약 $2{\sim}5^{\circ}C$정도 높았다. 과실의 ${\beta}-carotene$ 함량과 당함량은 기능성 필름과 일반필름에서 유의성 있는 차이를 보여 J-1, J-2, J-3 및 K-1에서 높게 나타났는데 이것은 필름의 특성에 따른 보온효과 때문인 것으로 생각된다. 성숙 후 단맛을 좌우하는 sucrose 함량도 기능성 필름에서 높았는데 이로 인해 당도도 향상되는 결과를 보였다. Ascorbic acid 함량은 투광량과 보온성이 낮은 K-2에서 더 높은 경향을 보였고 무기원소 함량은 처리간에 차이가 없었다. 이상의 결과는 참외의 저온기 단동 하우스재배에서 보온성과 투광성을 향상시킨 필름을 피복함으로써 참외 과실의 품질을 일부 개선할 수 있음을 시사하였다.

• 농업과학연구
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• 제40권4호
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• pp.317-323
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• 2013

This research was conducted to obtain the basic information for establishment of standard guidelines in the design and installation of roof ventilation system in single-span plastic greenhouse. To achieve this, the greenhouse structure & characteristics, cultivation status, and ventilation system were investigated for single-span greenhouse with roof ventilation system cultivating the Cucurbitaceae vegetables, watermelon, cucumber, and oriental melon. Most of single-span watermelon greenhouse in Haman and Buyeo area were a hoop-style and the ventilation system in those greenhouses mostly consisted of two different types of 'roof vent (circular or chimney type) + side vent (hole) + fan' and 'roof vent (circular type) + side vent (hole or roll-up type)'. The diameter of circular and chimney-type vent was mostly 60cm and the average number of vents was 10.5 per a bay with vent spacing of average 6.75m. The ratio of roof vent area to floor area and side vent area in the single-span watermelon greenhouse with ventilation fan were 0.46% and 7.6%, respectively. The single-span cucumber greenhouse in Haman and Changnyeong area were a gable roof type, such as even span, half span, three quarter and the 70.6% of total investigated single-span greenhouses was equipped with a roof ventilation fan while 58.8% had a circulation fan inside the greenhouse. The ratios of roof vent area to floor area in the single-span cucumber greenhouse ranged from 0.61 to 0.96% and in the case of the square roof vent, were higher than that of the circular type vent. On average, the roof ventilation fan in single-span cucumber greenhouse was equipped with the power input of 210W and maximum air volume of $85.0m^3/min$, and the number of fans was 9.75 per a bay. The number of roof vent of single-span oriental melon greenhouse with only roll-up type side vent ranged from 8 to 21 (average 14.8), which was higher than that of other Cucurbitaceae vegetables while the vent number of the greenhouse with a roof ventilation fan was average 7 per a bay.

• 한국환경농학회지
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• 제41권4호
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• pp.276-281
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• 2022

BACKGROUND: Plastics that are used in our daily lives largely end up in the environment. In agricultural environments, plastic wastes and microplastics can be found due to the uses and improper management of plastic products (e.g., vinyl greenhouses and mulching vinyl). Microplastics can also interact with contaminants in the agricultural environment. Therefore, this study was set to investigate the sorption characteristics of tetracycline, one of widely used antibiotics, on microplastics. METHODS AND RESULTS: The sorption tests were carried out with the tetracycline solutions (0-30 mg L^-1) and microplastic films prepared from low density polyethylene (LDPE) and polyvinyl chloride (PVC). The residual tetracycline concentrations were analyzed and fitted to the Freundlich and Langmuir isotherm models. The tetracycline sorption patterns on LDPE and PVC films were described better with the Freundlich isotherm model than the Langmuir isotherm model. The isotherm model parameters suggested that the maximum sorption amount of tetracyline was greater for PVC, while the sorption affinity was greater for LDPE. CONCLUSION(S): Different types of microplastics can have different sorption characteristics of tetracycline. Therefore, there is a need for continuous research on the interaction of various types and shapes of microplastics and contaminants in the environment.

• Journal of Biosystems Engineering
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• 제22권4호
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• pp.497-502
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• 1997

Automation facilities of greenhouses have been continuously developed. However, the conventional two-stage worm gear reducer reveals some problems, including low transmission efficiency. The worm gear reducer also have some difficulties in manufacturing and short life. Therefore, this study was performed to develop a planetary gear reducer, having a high Sear reduction ratio and high torque transmission efficiency. The planetary gear system consisted of a fixed ring gear and a 2-teeth differential ring gear turning slow, as the planetary pinion orbits fast around the fixed ring gear. The developed gear system can achieve a high speed reduction rate at one stage. The reducing system was employed to the greenhouse ventilation system. The reducer has the transmission efficiency of 70.5%, 2∼3 times longer life time, and twofold roll-up torque at an affordable price, comparing with conventional reducers. This reducer can be also applied to many industrial equipments, such as industrial crane, hoist, elevator and gondola etc.

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 1999년도 학술발표논문집
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• pp.51-54
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• 1999

1. 하우스 개폐장치 조작 불능시를 가정하여 천ㆍ측창을 인위적으로 폐쇄한 경우, 하우스내 온도는 외기온 보다 16$^{\circ}C$ 높은, 즉 사실상 작물을 생육할 수 없는 고온상태를 나타내었다. 이러한 결과는 하우스 상태 및 외기조건 등에 따라 다소 상이할 것으로 예상된다. 2. 천ㆍ측창을 개방한 상태에서 환기팬을 가동한 경우, 환기팬 가동에 따른 추가적인 실온 저하 효과는 계측되지 않았다. 3. 본 연구에서는 비교적 노즐 입경이 큰 스프링클러를 이용하여 관수시의 냉각효과를 검토하였다. 이 경우, 하우스내 온도는 스프링클러 작동과 동시에 비교적 짧은 시간내에 급격한 온도강하가 이루어졌다. 이 후 지속적인 온도강하는 둔화되어 비교적 안정된 온도를 유지함으로서, 하우스의 실온저하에 크게 기여하고 있음을 확인할 수 있었다.

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 2003년도 추계학술대회 논문집
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• pp.163-167
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• 2003