• Journal of Bio-Environment Control
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• v.12 no.1
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• pp.30-37
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• 2003

An expert system was developed for the stress diagnosis of cucumber and tomato using FoxPro. The principle points in building the system were integration with Korean, effective processing of mass information, and easy access for non-experts such as farmers. The method of inferencing was forward chaining based on pattern matching. Knowledge base was expressed with IF∼THEN rules and was expressed in the form of tree. Also, the expert system was designed so that additions and modifications of all information could easily be performed on windows. The results tested by farmers with the developed system showed that the expert system was reliable for the practical use. It was expected the expert system could be directly applied to the stress diagnosis of other vegetable plants by modifying only data bases.

• Journal of Bio-Environment Control
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• v.21 no.1
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• pp.50-56
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• 2012

This study was conducted to extend the postharvest life of eggplant ($Solanum$ $melongena$ L.) by modified atmosphere packaging using a OPP bag with 1-MCP to evaluate the alleviation effects of that treatment on external chilling injury during at low temperature. 1-MCP treatment at the level of $1.0{\mu}L{\cdot}L^{-1}$ were very effective in delaying the progress of surface bronzing of eggplant during 10 days of storage at $8^{\circ}C$, but not significant at $1^{\circ}C$. Also, the treatment of 1-MCP at the levels of $0.1{\sim}1.0{\mu}L{\cdot}L^{-1}$ are beneficial to complement low temperature storage and maintain quality indices such as higher firmness and lower weight loss than untreated control even at a critical low temperature 4 to $8^{\circ}C$. The treatment of carbon dioxide using dry ice (DI, 5 g/3 fruits) significantly promoted chilling injury of eggplant stored at $4^{\circ}C$, symptoms were appeared from 3 days after treatment and combination treatment of 1-MCP did not block the development of chilling injury symptom. Meanwhile, single treatment of $CO_2$ absorber (CA, 5 g/3 fruits) or combination treatment with 1-MCP at the level of $1.0{\mu}L{\cdot}L^{-1}$ prevented effectively the external and internal chilling injury at $4^{\circ}C$ during 6 days and 15 days of MAP storage, respectively. Results suggest that 1-MCP and carbon dioxide absorber treatments delay fruit deterioration and are beneficial to broaden storage temperature of eggplant fruits.

• JOURNAL OF ELECTRICAL WORLD
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• no.12 s.72
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• pp.95-99
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• 1982

최근의 엘렉트로닉스기술의 급속한 발전과 에너지절약 기운의 고조에 따라 다이리스터등을 응용한 전력제어기술의 다양화$cdot$ 대용량화가 진전되어 배전계통에 있어서의 고조파문제의 필요성은 금후 더욱 증대할 것으로 예상되고 있다. 여기에서는 배전계통에 있어서의 고조파의 실태와 고조파에 의한 장해실태에 대하여 일본의 경우를 들어 그 개요와 최근의 상황을 기술하기로 한다.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.4 no.1
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• pp.84-100
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• 1993

전기, 전자기기의 사용이 증가하면서 이들 기기에서 방사되는 전자파로 인한 장해가 심각한 문제로 대두되었다. 불필요한 전자파는 다른 기기의 성능을 저하시키는 것은 물론 인체에 대한 장해의 가능성을 내포 하고 있다. 최근 국내에서도 관심을 끌고 있는 전자파의 인체위해 가능성과 관련하여 논해 보기로 한다.

• The Science & Technology
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• v.30 no.12 s.343
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• pp.16-18
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• 1997

전자파가 새로운 환경오염원으로 인체에도 장해를 주고 있어 관심을 모으고 있다. 핸드폰을 사용하는 사람에게 뇌암 발생률이 높다는 보고가 있는가 하면 온몸에 강력한 전파를 쏘이면 태아 기형과 암을 일으킬 수 있다는 사실도 동물실험을 통해 알아냈다. 보건복지부의 한 관계자는 "전자파중 마이크로 웨이브가 인체에 해롭다는 사실이 확실해 가능한 한 전자파에 노출되지 않도록 해야 한다"고 권고하고 있다.

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.13 no.2 s.107
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• pp.65-73
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• 1992

결론적으로 하우스의 연작장해 대책은 유기물 증시를 포함한 합리적인 비배관리를 바탕으로 논밭 돌려짓기등 윤작과 심경, 침수 등으로 염류 집적을 예방하는 동시에 적절한 수분관리와 석회시용, 접목재배 그리고 태양열소독, 약제소독등 보다 적극적인 토양소독 등의 근본적이고도 복합적인 병충해 방제대책을 수립, 실천하는 것이다.

• Korean Journal of Environmental Agriculture
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• v.27 no.3
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• pp.253-259
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• 2008

Soil environmental conditions can affect nutrient availability during growth stage of tree fruit. We investigated the cause of disorderd fruit by the influence of soil chemical properties in orchard soil, composition of mineral nutrient in leaves and fruit to occur physiological disorderd fruit at four locations (Ulsan, Gyeongju, Pyeongtaek, Ansung) compared to healthy. There were significantly different (P=0.05) in exchangeable Ca, K, Mg and total nitrogen content in orchard soil between physiological disordered fruit and healthy fruit. The exchangeable Ca content in orchard soil caused by physiological disordered fruit was statistically lower than that of healthy fruit. However, exchangeable K, Mg and total nitrogen contents were higher than that healthy (P=0.05). There was a significant difference (P=0.05) in Ca content between physiological disordered fruit and healthy. Ca content in fruit flesh of physiological disorderedfruit was statistically lower than that of healthy. The physiological disordered fruit was a higher ratio of Mg/Ca in fruit flesh and peel compared to healthy fruit and also the ratios of N/Ca and K/Ca in a leaf were higher. The negative correlation between Ca and K, and Ca and Mg was detected in the fruit flesh of physiological disordered fruit. Therefore, we concluded that insufficient Ca content in fruit may cause 'the physiological disorder' pomelo disease and high content of N, exchangeable K and Mg ion in the soil solution might be disturbs exchangeable Ca ion to be absorbed in fruit.

• Journal of Bio-Environment Control
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• v.19 no.2
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• pp.93-96
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• 2010

Breaker stage tomato fruits that were stored at low temperatures show typical chilling symptoms such as uneven ripening and a high respiration. Experiments were performed to assess and compare these chilling injury symptoms of breaker stage tomato fruits, and to gather basic data that can be used to decide whether horticultural crops receive chilling injuries. Tomato fruits that had been sorted in the breaker stage were stored at $2^{\circ}C$ for 0, 3, 6, and 9 days, and then their respiration rates were measured at 3, 6, 9, 12, 24, 36, and 48 h after moving them to room temperature. This treatment was repeated twice on the same procedures, except the storage periods, which were changed to 0, 1, 2, 3, and 10 days. The respiration rate was increased in a 1 day storage treatment, and the increasing rate rose higher with extended storage periods. The $a^*$ value, which represents the surface color of tomato fruits, was measured 10 days after moving to them into room temperature. Those with an increased $a^*$ value rate got dull and showed uneven coloring after 2 days' storage treatment. These two factors, the respiration rate and $a^*$ value of the surface, showed a high correlation (r = 0.9716, p < 0.001). Therefore, the chilling injury of breaker stage tomato fruits can be diagnosed by measuring the respiration rate after moving them into room temperature, and the degree of chilling injury can also be assessed in terms of the respiration increase rate.

• Korean Journal of Food Science and Technology
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• v.36 no.2
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• pp.283-287
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• 2004

Persimmons suffer from such physiological disorders as flesh softening, peel blackening, and flesh browning, which occur rapidly particularly when exposed to ambient temperature after storage at low temperature, In this study causes of these disorders were examined in terms of respiration and ethylene production of the fruits. Jelly-like flesh softening, considered as symptom of chilling injury, rapidly developed within 3 days of exposure to ambient temperature without modified atmosphere (MA) packaging after low temperature storage. Disorder development was more suppressed at $30^{\circ}C$ than at $20^{\circ}C$; such temperature dependence is closely connected to ethylene production rate of fruits at both temperatures. Inhibition of ethylene production through MA packaging effectively reduced disorder development, which indicates ethylene production is closely related to jelly-like flesh softening disorder. Development of black-staining on peels occurs in fruits exposed directly to ambient temperature, but not in those packaged with thick PE-film. Flesh browning developed only under anaerobic respiration condition of high temperature and MA packaging with thick PE film, and occurred at quick reduction of available oxygen inside MA package at high temperature.

• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.2
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• pp.244-253
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• 2022

Recently, installation projects of structures such as offshore wind farms have been increasing, and the installation of such marine obstacles could affect ships that pass nearby. Therefore, the purpose of this study was to quantitatively evaluate the risk posed to passing ships due to obstacles in their passage. Hence, parameters that affected the risk were selected, and scenarios were set based on the parameters. The scenarios were evaluated through the ES model, which is a risk assessment model, and we confirmed that the risk ratio increased as the size of the obstacle increased, the safe distance from the obstacle increased, the speed of ship decreased, and the traffic volume increased. Additionally, we found that when the traffic flow direction was designated, the risk ratio was lower than that of general traffic flow. In this study, we proposed a generalization model based on the results of the performed scenarios, applied it to the Dadaepo offshore wind farm, and demonstrated that the estimation of the approximate risk ratio was possible through the generalization model. Finally, we judged that the generalization model proposed in this study could be used as a preliminary reference for the installation of marine obstacles.