• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.315-318
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• 2002

우리나라 원예시설면적은 '00년 말 현재 52,189ha이며, 이중 단동형 비닐하우스 면적은 채소가 34,173ha로 대부분을 차지하고 있다. 단동형 비닐하우스에 사용하는 골재는 주로 ø25mm를 95%이상 사용하고 있으며, 서까래 간격은 지역별로 다르나 대부분 80cm 이상으로 설치되어 있다. 이와 같은 골재와 서까래간격은 구조적으로 매우 취약하여 자연재해에 대비하기 위해서는 자연재해시 사전ㆍ사후대책이 필수적이며, 근본적으로는 비닐하우스 구조적 안전성이 확보되어져야 한다. (중략)

• Korean Journal of Weed Science
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• v.16 no.4
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• pp.259-263
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• 1996

Occurrence and distribution of weeds were surveyed in autumn vegetable crops(Chinese cabbage, radish, cucumber and Welsh onion) in 16 cities or counties of Chungnam area during October and November 1995. Thirty weed species were occurred, and Rorippa globosa, Alopecurus aequalis var. amurensis, Stellaria media, Portulaca oleracea, Digitaria sanguinalis and Chenopodium album var. centrorubrum showed higher importance values among them. S. media, P. oleracea and A, aequalis var. amurensis were dominant in northwest coastal area, R globosa, D. sanguinalis and S. media in southwest coastal area, R globosa, A. aegualis var. amurensis and D. sanguinalis in northern area, and R globosa, A. aequalis var. amurensis and P. oleracea in southern area. S. media, R globosa and P. oleracea were dominant in Chinese cabbage fields, R globosa, Amaranthus retroflexus and S. media in radish fields, A. retroflexus, S. media and D. sanguinalis in cucumber fields, and R. globosa and P. oleracea in Welsh onion fields.

• Air Cleaning Technology
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• v.22 no.2
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• pp.31-39
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• 2009

최근 식생활의 다양화와 식품 안전에 대한 관심 증가에 따라 식품 공장의 청정화와 작업장의 위생 관리에 대한 노력이 많이 이루어지고 있다. 그 중에 서도 농식품 분야에서는 최근 들어서 신선한 과일과 채소류를 식품소재로 이용한 신선편이 가공 농산물의 수요가 늘어나고 있다. IFPA(The International Fresh-cut Produce Association)의 정의에 따르면 신선편이 농식품은 박피되거나 절단되어져 신선함을 유지한 채로 소비자들에게 높은 영양과 편이성 및 풍미를 제공하는 포장형태의 100% 이용 가능한 과일 및 채소제품을 말한다. 이러한 신선편이 농식품은 식재료공급에 있어 안전성 및 편이성이 있으나 수확 후 처리시설에 대한 위생 개념이 도입되지 않고는 양질의 식재료를 공급하는 것은 어렵다. 그러나 신선편이 농식품은 살아있는 생체 조직으로 박피, 절단 등의 과정을 거치면서 세포가 파괴되어 급격한 품질 변화가 나타 날 수 있으며, 최소한의 비가열 가공공정만을 거치게 되므로 식품원료 내에 존재하는 미생물이 그대로 유지 될 수 밖에 없는 문제점을 가지고 있다. 또한 일반적으로 선선편이 제품의 가공과정에서 절단 처리시 표면에 묻어 있던 미생물이 과육 부위로 옮겨지면서 식품 세포 조직의 체액을 영양성분으로 활용하여 급격히 증식함으로서 식품의 변질을 일으키거나 섭취시 질병을 일으킬 수 있는 가능성이 있다. 특히, 신선편이 농식품 중에서 가장 많이 소비되는 엽채류는 수확 직후 잎 표면에 토양과 물에 의한 다양한 미생불이 부착되어 식품의 변질 가능성이 크다. 그러므로 농산물의 유통 및 보관단계에서 미생물 오염 가능성이 있기 때문에 신선편이 농식품은 원료 구입 후 제품 생산 및 포장에 이르는 과정에서 각 작업 단계별 위해요소를 분석하고, 식품 안전성을 확보하여 철저한 위생 관리가 중요하다. 따라서 본 자료는 농식품 작업장중 세척공정을 거치는 신선편이농산물과 세척공정을 거치지 않는 신선농식품 작업장에 대한 위생관리 및 관련 설비 기술 개발을 위한 기초 자료로 활용하고자 현재 운영중인 작업장을 중심으로 직접 현지 조사한 자료이다.

• Korean Journal of Environmental Agriculture
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• v.25 no.1
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• pp.93-103
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• 2006

This study was undertaken to survey the usage of environment-friendly materials for 8 vegetable crops including cucumber, tomato, strawberry, eggplant hot pepper, lettuce, perilla leaves, and Welsh onion, cultivated under protected houses. Total of 78 environment-friendly growers in the Southern part of Korea were surveyed from 2003 to 2004. The number of materials used for a crop based on the effectiveness claimed by farmers was $21{\sim}87$ for pest control, $0{\sim}9$ for fertilizing, $2{\sim}41$ for growth promotion and $10{\sim}37$ for soil improvement. It is needed to clarify the ingredients and effectiveness of those environment-friendly materials reaching 323 items, on a science-basis in the future.

• Journal of Bio-Environment Control
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• v.31 no.4
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• pp.504-512
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• 2022

To examine the distribution of internal solar radiation within various locations in multi-span greenhouses, the solar radiation, light transmittance, and accumulated radiation at the central and lateral sections were analyzed by dividing 8:30 to 12:30 in the morning and 12:35 to 16:30 in the afternoon. The growth and yield of tomatoes within these sections were also compared. In the morning, the solar radiation of the central section and the side section was 275.2 W·m^-2 and 314.9 W·m^-2, while in the afternoon, it was 314.9 W·m^-2 and 313.9 W·m^-2, respectively. The light transmittance and accumulated radiation were also low, confirming the low distribution of solar radiation in the central (connecting) section of the multi-span greenhouses. The growth survey revealed no significant difference. The final yield of tomatoes per plant was 4,828 g in the central section and 4,851 g in the lateral section, but there was no significant difference in the central section compared to the lateral section by 0.5%. However, the amount of solar radiation as per time in the central section is higher than the light compensation point, 60 W·m^-2, and slightly lower than the light saturation point of tomatoes, i.e., 281 W·m^-2. The results of this study can help in greenhouse design based on the insolation environment.

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.2
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• pp.365-372
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• 2004

The purpose of this study was to implement HACCP system to foodservice of W and D elementary schools with joint-lunch management system in Kyungsan area. Steamed rice with squid was selected and Control Action, Monitoring Procedure and Control measure were identified based on HACCP flowchart to produce safe and healthy food. It was suggested that frozen squid must be thawed under the cold running city water and kept temperature below 1$0^{\circ}C$ and receiving/thawing procedure has to be done within 30 min. Raw vegetables must be washed under three-tube wash stand and whole prepreparation procedures should be done in 20 minutes. Clean and sanitize all the equipment and utensils before and after handling squid. Knives and cutting boards for vegetable and squid should be classified. Sauce for steamed rice with squid should be heated about 21 minutes to reach the temperature of 94$^{\circ}C$ before serving and internal temperature of food must be kept above 84.4$^{\circ}C$ during serving. The ideal temperature of kitchen should be remained 15∼18$^{\circ}C$. The underground water has to be excluded to minimize the risk of contamination in the foodservice facility and the prepreparation place must be separated with cooking place. Also, Personal hygiene Practice should be check in each stage. Further, additional research needs to be conducted to determine models for HACCP implementation for different menu.

• Journal of Practical Agriculture & Fisheries Research
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• v.22 no.2
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• pp.135-146
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• 2020

In the strawberry cultivation areas and domestic farms, two-spotted spider mites are the most serious pests. It decreases the product yield due to the direct feeding of chlorophyll by the mites resulting in reduced photosynthetic ability of host plant. In this study, a simplified acaricidal effect evaluation system (SAEES) was employed to choose the effective acaricidal products among 10 items based on leaf-dipping bioassay methods. SAEES had the advantage of being able to screen four commercial products with three replications at the same time in the recommended concentration. The susceptible strains (SL_YS) showed a high mortality rate of about 90-100%, whereas the mortality of local strains was differed by each acaricides. It suggests that the acaricide responses of field populations might differ due to spray frequencies and acaricide product. An efficacy index (0.8-1.0) was determined based on the mortality of susceptible strain, which would allow the most effective commercial products to be selected by the range of this index. In summary, SAEES will enable the selection of effective commercial products and contribute to increasing control against T. urticae in strawberries.

• Korean journal of applied entomology
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• v.61 no.1
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• pp.229-238
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• 2022

Animal pollination is an important ecosystem service provided mostly by diverse insect groups such as bees and hover flies. Maintaining agricultural productivity and securing the nutritional balance are closely tied to human wellbeing. This study aimed to estimate the pollination dependent food production in Korean agricultural system. Crop production data were obtained from Korean statistical information service (KOSIS) data of 2015. By implementing pollination dependency, crop production and market price, contribution of insect pollination to crop production increase were estimated from total 71 crops including 12 cereals, 19 fruits, 18 field vegetables, 13 greenhouse vegetables and 9 specialty crops. Mean pollination dependency of all crops were 29.2% and it was higher on fruits, specialty crops and greenhouse vegetables as well, but low (7.5%) in cereal crops. Pollination dependent (PD) production was estimated as 17.8% of total agricultural crop production with the economic value of 6,850 (6,508-7,193) billion won. Especially, PD production of greenhouse vegetables accounted 49.2% followed by fruits of 42.9%. Even specialty crop also showed higher PD production (35.9%). It was obvious that pollination is the vital service for agricultural production as well as nutritional security in Korea. Further protection and enhancing the pollination service were discussed with integrated pollinator-pest management (IPPM) strategies.

• Journal of Bio-Environment Control
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• v.30 no.4
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• pp.410-418
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• 2021

This study was conducted in 8.2m wide single-span greenhouse to investigate the effect of presence or absence of rafter steel pipe joint and foundation conditions on greenhouse structural performance. Structural performance was evaluated by static loading test using the structural performance evaluation system for single-span greenhouse. The measured displacement was compared with the predicted result by numerical analysis. The displacement of each measurement location showed a significant difference regardless of the conditions of the foundation and presence or absence of rafter steel pipe joint. Compared to the hinge conditions, the difference in structural performance of the greenhouse in the fixed conditions was seen to be relatively large. The difference in structural performance according to presence or absence of rafter steel pipe joints, the lateral stiffness of the joint was 8.1% greater.

• Journal of Bio-Environment Control
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• v.31 no.4
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• pp.438-443
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• 2022

In this study, the lateral loading test was performed to analyze structural performance of multi-span plastic greenhouse through full-scale experiment and numerical analysis. In order to analyze the lateral stiffness and stress, we installed 9 displacement sensors and 19 strain gauge sensors on the specimen, respectively, and load of l mm per minute was applied until the specimen failure. In the comparison between the full-scale experiment and the structural analysis results of a multi-span greenhouse with venlo-type roof according to bracing installation, there was a large difference in the lateral stiffness of the structure. By installing a brace system, the lateral stiffness measured near the side elevation of the specimen increased by up 44%. As the bracing joint used in the field did not secure sufficient rigidity, the external force could not be transmitted to the entire structure properly. Therefore, it is necessary to establish a bracing construction method and design standards in order for a greenhouse to which bracing applied to have sufficient performance.