• 한국농공학회:학술대회논문집
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• 한국농공학회 2000년도 학술발표회 발표논문집
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• pp.315-320
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• 2000

An investigation and structural safety analysis was conducted to get the basic data for establishing maintenance strategy of pipe framed greenhouses. The number of greenhouses investigated was 108 in total. Most multi-span greenhouses had narrower width and lower height than the standard 1-2W greenhouse, and most of single-span greenhouses were tunnel type. In multi-span greenhouses, the size and interval of frameworks such as rafter, purline, column, and cross beam were mostly suitable, but frameworks of single-span greenhouses were mostly insufficient.

• 한국농공학회지
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• 제42권4호
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• pp.106-114
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• 2000

An investigation was conducted to get the basic data for establishing maintenance strategy of pipe framed greenhouses. The contents of the investigation consisted of actual state of structures, maintenance status, meteorological disaster, and corrosion characteristics of pipe framework in greenhouses. the number of greenhouses investigated was 108 in total. Most multi-span greenhouses had narrower width and lower height than the standared 1-2W greenhouse, and most of single-span greenhouses were tunnel type. In multi-span greenhouses, the size and interval of frameworks such as rafter, purline, column , and cross beam were mostly suitable, but frameworks of single-span greenhouses were mostly insufficient. After about 7 years in grounds, 8 years in joints, 10 years in bending parts. and 13 years in columns. pipe surface was mostly rusted. Most weak parts in corrosion were pipes in contact with the ground, joints, roll-up shaft pipes, and pipes close to the gutter. Almost all of the greenhouse farmers didn't pay any attention to maintenance affair in a regular interval for pipe framed grenhouses. Many greenhouses have experienced the meteorologicla diaster such as uplift of foundation, partial or complete failure by the hyphoon and/or high winds.

• 한국디지털건축인테리어학회논문집
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• 제12권1호
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• pp.5-13
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• 2012

The frame of pipe greenhouses in Korea have been collapsed increasingly due to very weak in structure caused by the heavy snow and strong wind. In order to reduce the collapse of green houses, it is urgent to develop the new structural system in stress tolerant greenhouses. Therefore, this paper performed the structural analysis of greenhouse frame in accordance with snow loads and wind loads. Three type models in structural frame configuration of greenhouses, that is, existing type, diagrid type, and honeycomb type are selected. It was classfied the section shape of structural frames in greenhouses into arch style, standard style, and diagonal standard style. As a result of this paper, it was verified that the structural system of diagrid type is better than that of existing type against snow loads and wind loads in the frame of greenhouses.

• 농업과학연구
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• 제38권3호
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• pp.505-512
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• 2011

Structural characteristics for standard models of single-span plastic greenhouse in Korea and high tunnels in North America were analyzed, and comparative analysis for greenhouse environments measuring in Korean farmhouse and Rutgers high tunnel was carried out to find structural and environmental improvements of single-span plastic greenhouses that occupy most of Korean greenhouse. Widths of high tunnels are similar to single-span plastic greenhouses but their heights are high comparatively and their side heights are fairly higher than single-span plastic greenhouses specially. Rafters, which are main frames, section sizes of high tunnels are bigger and their intervals are wider than single-span plastic greenhouses. Relative bending resistances compared with representative Korean greenhouse were analyzed by 0.92 to 1.42 in single-span plastic greenhouses, and 1.38 to 2.96 in high tunnels. Frame ratios of single-span plastic greenhouses were 6.8 to 8.6%, and those of high tunnels were 5.5 to 8.7%. We analyzed air temperatures and solar radiations measured in single-span plastic greenhouse and high tunnel on clear days in late March. There were outside temperatures in generally similar range, and judging by rise of indoor temperatures, ventilation performance of high tunnel is more excellent than single-span plastic greenhouse. Solar radiations of two areas were no big difference but light transmittance of high tunnel was a little bit higher than single-span plastic greenhouse. Single-span plastic greenhouses are disadvantageous in environmental managements such as ventilation performance and light transmittance because distance between greenhouses is too narrow and length of greenhouse is too long compared to high tunnels. To get the environmental improvement effects as well as to increase the structural resistance of single-span plastic greenhouses are achievable by widening the width of greenhouse in possible range, widening the space between rafters, and enlarging the section size of rafters. Also, we need to secure enough distance between greenhouses and to restrict the length of greenhouse by maximum 50 m in order to improve the ventilation performance and the light transmittance.

• 생물환경조절학회지
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• 제3권2호
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• pp.128-135
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• 1994

지역별로 분포하고 있는 특성화된 온실의 장점을 살리고 구조적인 위험요소를 줄임으로서, 지역특성온실로 정착할 수 있도록 하기 위하여 지역별로 특성화된 온실의 구조실태를 조사하고 구조적 안전성을 검토하였으며 그 결과를 요약하면 다음과 같다. 1. 전남지방에 특성화된 온실의 보급이 많았으며, 광폭형하우스와 대형 단동 파이프하우스가 이 지역의 특성화된 온실로서 뚜렷한 경향을 나타내었다. 2. 경남 김해의 목재하우스, 전남 구례의 트러스형하우스, 강원 평창의 돔형 파이프하우스, 충북 옥천의 포도재배하우스 등이 특징적인 온실로 나타나고 있었다. 3. 광폭형하우스, 트러스형하우스, 돔형 파이프하우스 및 포도재배하우스는 15-30년 빈도의 풍하중과 설하중에 대하여 안전한 것으로 나타났으나, 대형 단동 파이프하우스는 약간의 보강이 필요하며, 목재하우스는 매우 불안정하여 사용을 중지하는 것이 좋을 것으로 판단되었다. 4. 대상온실의 기초는 모두 30년 빈도의 강풍에 대하여 충분한 인발저항력을 가지는 것으로 나타나 안전한 것으로 판단되었다.

• 한국농공학회논문집
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• 제59권6호
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• pp.1-8
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• 2017

The purpose of this study was to provide basic data for development of environmental design technology for greenhouses constructed in reclaimed lands. We analyzed the climatic conditions around seven major reclaimed land areas in Korea, which have a plan to install advanced horticultural complexes. The characteristics of heating load through the thermal environment measurement of the greenhouse in Saemangeum were analyzed. The part to be applied to the environmental design of the greenhouses in reclaimed lands were reviewed. The overall heat transfer coefficient of the experimental greenhouse with the aluminum screen and multi-layer thermal curtain averaged $3.79W/m^2^{\circ}C$. It represents a 44 % heat savings rate compared with plastic greenhouses with a single covering, which was significantly lower than that of the common greenhouses with 2-layer thermal curtains. This is because the experimental greenhouse was installed on reclaimed land and wind was stronger than the inland area. Among the total heating load, the transmission heat loss accounted for 96.4~99.9 %, and the infiltration loss and the ground heat exchange were low. Therefore, it is necessary to take countermeasures to minimize the transmission heat loss for greenhouses constructed in reclaimed lands. As the reclaimed land is located on the seaside, the wind is stronger than the inland area, and the fog is frequent. Especially, Saemangeum area has 2.6 times stronger wind speed and 3.4 times longer fog duration than the inland area. In designing the heating systems for greenhouses in reclaimed lands, it is considered that the maximum heating load should be calculated by applying the wind coefficient larger than the inland area. It is reasonable to estimate the operation cost of the heating system by applying the adjustment factor 10 % larger than the average in calculating the seasonal heating load.

• 한국응용곤충학회지
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• 제59권1호
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• pp.55-64
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• 2020

스마트 온실은 주로 파프리카, 토마토, 딸기와 같은 과채류 작물을 대상으로 보급되었다. 스마트 온실의 보급량은 지속적으로 증가하고 있지만, 그 실태에 대한 조사는 부족하다. 그러므로, 이번 연구를 통해 한국의 스마트 온실의 시설 규모, 재배작물, 재배방법, 발생 병해충과 실사용자의 평가를 중심으로 한 현 실태를 파악하고자 하였다. 스마트 온실의 리스트는 각 권역별 현장지원센터로부터 제공받았으며, 모든 조사는 농가를 직접 방문하여 수행되었다. 조사된 스마트 온실 농가의 약 50%가 3,300 ㎡~6,600 ㎡ 사이의 규모로 운영하고 있었다. 조사된 농가 중 97.1%가 화학적 방법을 이용해 병해충을 방제하고 있었다. 조사된 농가에서 응답한 주요 식물병은 흰가루병과 잿빛곰팡이병으로 각각 54.4%, 33.8% 비율로 주로 문제가 되는 식물병이라고 응답하였다. 모든 토마토 농가에서 가루이류가 가장 문제가 되는 해충이라고 응답하였다. 그러나, 파프리카 농가의 76.5%, 70.6%가 총채벌레류와 진딧물류를 가장 문제가 된다고 응답하였다. 스마트 온실에 대한 사용자의 만족도는 10점 만점에 평균 7.5점이었다. 이 결과는 한국의 현재 스마트 온실을 관리하고 미래 스마트 온실을 설계하는 계획을 세우는 데 도움이 될 것이라 생각된다.

• Current Research on Agriculture and Life Sciences
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• 제31권4호
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• pp.280-285
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• 2013

국내에 설치되어 있는 원예시설 중 가장 많은 면적을 차지하고 있는 단동비닐하우스의 기상재해로 인한 피해를 경감시킬 수 있는 모델 개발에 필요한 기초자료를 제공하고자 재배작물별로 대표적인 온실규격를 선정하여 안전풍속과 적설심을 구한 후 재현기간 8년에 해당하는 지역의 설계풍속 및 적설심과 비교하여 온실의 구조 안전성을 분석한 결과를 요약하면 다음과 같다. 1. 재배작물별 대표온실에 단위풍하중을 적용한 결과, 최대 단면력은 과채류, 근채류, 엽채류 온실 순으로 크게 나타났으며 재배작물별 서까래 간격을 고려한 안전풍속은 엽채류 온실이 17.7 m/s, 과채류 온실이 20.2 m/s, 근채류 온실이 22.3 m/s로 나타나 지역별 8년 빈도의 설계풍하중과 비교하였을 때 홍천, 이천, 성주지역을 제외하고는 대부분의 지역에 있어서 불안전한 것으로 나타났다. 2. 재배작물별 대표온실에 단위 적설하중을 적용한 결과, 근채류 온실의 최대 단면력이 가장 크게 나타났으나 재배작물별 서까래 간격을 고려한 안전적설심은 엽채류 온실이 8.8 cm, 과채류 온실이 9.4 cm, 근채류 온실이 11.8 cm인 것으로 나타났다. 이러한 결과를 지역별 8년 빈도의 적설하중과 비교하였을 때 경남지역 일부를 제외하고는 대부분의 지역에 있어서 불안전한 것으로 분석되었다. 3. 재배작물별 대표 온실의 안전풍속과 적설심에 대하여 구조물에 발생하는 최대 인발력은 12.7~15.1 kgf/개소, 최대 연직하중은 20.6~21.7 kgf/개소로 나타나 기초는 안전한 것으로 분석되었으나 안전풍속과 안전적설심이 매우 작기 때문에 폭설이나 강풍에 대비한 보강이 필요한 것으로 나타났다. 4. 재배작물별 대표온실의 안전풍속과 적설심을 증가시키기 위해서는 서까래 간격을 감소시키거나 부재의 단면 치수를 증가시키는 등의 보강대책이 필요한 것으로 나타났다.

• The Plant Pathology Journal
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• 제17권1호
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• pp.45-51
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• 2001

A root rot/vine decline disease occurred naturally on bottle gourd-stocked watermelon, melon, oriental melon and squash grown in greenhouses, but not on these plants grown in fields. Self-rooted watermelon, cucumber, pumpkin and luffa were also proven to be hosts of the pathogen by artificial inoculation in this experiment. The pathogen was identified as Monosporascus cannonballus by comparing microscopic characteristics of fungal structures with those of previously identified fungal strains. Our field investigations showed that the temperature and electric conductivity of soil in infected greenhouses were higher and the soil moisture content was lower than in noninfected greenhouses. To investigate soil-environmental factors affecting disease development, greenhouse trials and inoculation experiments were conducted. The host plants inoculated and grown under conditions of high soil temperature and electrical conductivity ($35\pm2^{\circ}$, 3.2-3.5 mS) and with low soil moisture content (pF 3.0-4.5) were most severely damaged by the fungal disease. Since plants growing in greenhouses ae usually exposed to such environmental conditions, this may be the reason why the monosporascus root rot/vine decline disease has occurred only on cucurbits cultivated in greenhouses but not in field conditions.

• 한국응용곤충학회지
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• 제48권3호
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• pp.281-284
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• 2009

우리나라에 1920년대 후반부터 현재까지 72종의 깍지벌레과가 보고되었으며, 이중 9종은 온실에서 보고된 종이다. 온실에서 보고된 9종중 7종은 야외에서 서식하는 자생식물 또는 온실에서 재배되는 식물에서 발생이 확인되지 않았다. 나머지 2종은 온실에서 재배되고 있는 파인애플, 틸란드시아 및 선인장에서 채집 확인되었으나, 야외에서 서식하는 자생식물에서 발생되지 않았다.