• KIEAE Journal
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• 제11권2호
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• pp.75-82
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• 2011

In Korea, the ratio of population in urban areas used to be only 50.1% in 1970, but with the value risen to 90.8% in 2009, urbanization is going on rapidly. Urbanization, which occurs by the rampantly planted buildings, has become major source of raising building density, changing wind direction and reducing wind amount, and such reductions are affecting even inside the building. In each year, among the total energy consumption in Korea, residential portion takes up significant ratio, and specifically the ratio of apartment house is shown to be highest. In order to solve such problem, many studies are being conducted for the improvement of natural ventilation performance. The natural ventilation performance of apartment house are significantly determined by the characteristics of external and internal structure, but in macroscopic perspective, the performance is established fundamentally by the layout characteristics of the main building of the apartment house in preparation for wind conditions. So far researches on raising the thermal comfort through elevation of ventilation performance have been conducted actively, but many of them propose only theoretical concepts deduced through wind path analysis, and do not include any indicator to measure ventilation performance simply only with area data from layout planning stage. Therefore, in this study, gap ratio a wind field measuring indicator was developed, and after the ventilation characteristics by layout types and main building uniformity were identified, the scope of gap ratio efficient for ventilation and that of uniformity were clarified, followed by verification through simulation.

• 한국잠사학회:학술대회논문집
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• 한국잠사학회 1997년도 Progress and Future Development of Sericultural Science and Technology 40th Anniversary Commemoration Symposium
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• pp.1-21
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• 1997

Silk is praised "Queen of Fiber", which wrote a glorious page in the history of human adornment culture. Thanks to the development of science and technology, silk production has been increased dramatically during last half century. Nowadays, as "Healthy Fiber" silk lets all the globe to be forming the "Silk Boom" Like in other scientific fields, a great deal of progress has been made in sericultural science and technology, which also accelerated the development of multipurpose utilization of sercultural recourses. The main tendency of the sericulture development is raising the quality of cocoon, and at the same time, increasing the output per unit mulberry area and labor production efficiency. The chief measure of raising the cocoon quality is breeding and selecting the new mulberry and silkworm varieties, preventing and curing the diseases and pests and improving the environment of mounting, and the symble for increasing the labor productivity is carrying out the technological system of saving labor and operation ease, and enlarging the production scale. As a natural protein fiber, silk will be still a favorite with human in the next century, because its structure and properties can not be replaced by other any fiber. The 21st century is the biological time, and measures of developing sericulture will use the achievement on the field of molecular biology and biotechnology to carry out the molecular breeding, development regulating, silkworm rearing industrializing, exploiting the new silk and its new usage, utilizing the sericultural resources, and producing the special protein from silkworm as a host of expressing exogenous genes so that make the sericulture to contribute more what it can do for the human being.

• 한국가금학회지
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• 제46권1호
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• pp.47-53
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• 2019

The aim of this study was to investigate the difficulties that Korean farmers and processors currently experience with respect to the market for Korean native chicken (KNC). This study also provides suggestions by which they can overcome these difficulties. In all, sixty-nine farmers and sixty-two processors participated in our investigation, which addressed 1) the current difficulties that KNC farmers face, 2) the current importance-satisfaction measures among KNC farmers and processors, and 3) the future direction of the KNC market: farmer and processor opinions. The respondents stated that the limited number of sales stores was the most difficult market condition they faced in raising KNC, followed by feed cost, animal disease, and poor production environment. Regarding issues of importance and satisfaction, origin in raising step and slaughtering in the processing and distribution step were considered the areas most in urgent need of improvement, given farmers' and processors' high levels of dissatisfaction with these. Both the free-range farming system and the concept of animal welfare are growing in importance, given consumers' interests in these areas. As to opinions on the direction of KNC development, menu development was cited as most important, followed by public advertisement, accessibilities, business aid, and breed development. Consequently, the results show that well-organized support from both the government and related industries is needed, as chicken farmers and processors cannot resolve certain limitations inherent in the KNC industry on their own.

• 한국심리학회지 : 문화 및 사회문제
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• 제18권1호
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• pp.53-77
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• 2012

여성의 경제활동참여증가, 생활수준향상 및 가족유지비용증가, 개인적가치우선의 현상에 따라 최근 저출산현상이 더욱 심화되었으며, 이에 대한 사회적 비용 급증을 우려하여 전반적인 대응전략을 마련된 것이 바로 저출산고령사회기본계획이다. 1차에 이은 2차 기본계획은 일반가족의 양육지원과 종합적인 일가정양립지원 강화가 주요 핵심으로 이는 비단 정책뿐아니라 전방위적으로 사회전반에 걸친 변화가 수반되어야 가능한 일이다. 이 논문에서는 이러한 저출산대응정책의 실제사례를 살펴보기 위해 가족과 지역사회내 돌봄지원정책을 살펴 보았다. 가족내 자녀양육지원사업으로서 아이돌봄지원사업과 가족내 돌봄나눔에 있어 핵심요인인 남성의 자녀양육참여를 촉진하기 위한 남성대상교육, 그리고 지역내에서 가족 돌봄나눔을 실천할 수 있는 가족품앗이와 공동육아나눔터 운영을 통해 향후 저출산 정책에서 강조하고 있는 일반가족의 자녀양육지원 방향에 대한 해법을 제시하고 있다.

• 생물환경조절학회지
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• 제28권4호
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• pp.342-351
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• 2019

종이포트 육묘를 위해 조제한 피트모스(>2.84mm 체를 통과한 비율이 80-90%)와 펄라이트(1~3mm 등급) 혼합상토(7:3, v/v)의 적정 질소 기비 수준을 구명하기 위하여 본 연구를 수행하였다. 기비로 혼합한 질소 농도를 0, 150, 250, 500 및 $750mg{\cdot}L^{-1}$으로 조절하였고, 질소를 제외한 필수원소는 모든 처리에서 동일하게 농도를 조절하였다. 혼합상토를 40-cell 트레이에 충진한 뒤 배추 '춘명봄배추'와 청경채 '하녹청경채'를 파종하였고 파종 후 각각 21일 및 20일 육묘하였다. 파종 후 매주 상토를 수집하여 토양 pH, EC 및 무기원소 농도를 분석하였고, 재배 후 지상부 생장 조사와 식물체 무기원소 함량 분석을 하였다. 생장 기간 동안 상토의 pH는 완만하게 상승하였고, EC는 파종 3주 후 급격히 낮아졌다. 수확 시기에 배추를 육묘한 상토의 pH는 5.3~5.9의 범위로, 청경채를 육묘한 상토는 4.93~5.39의 범위로 측정되었고, 청경채를 육묘한 상토의 pH가 더 낮았다. 작물의 지상부 생장은 배추와 청경채 모두 질소 $250mg{\cdot}L^{-1}$ 처리구에서 우수했으며 질소 무처리구에서 생장이 가장 저조 하였다. 식물체내의 무기원소 함량 분석결과 질소 시비수준이 높을수록 식물체내 질소 함량이 증가하고, P, Ca 및 Mg 함량이 낮아졌다. 질소 시비 수준에 따른 지상부 건물중 변화에서 배추는 $y=-0.0036x^2+0.0021x+0.0635(R^2=0.9826)$, 청경채는 $y=-0.16x^2+0.0009x+0.032(R^2=0.991)$의 회귀관계가 성립하였다. 생장이 가장 우수하였던 처리구의 건물중인 배추 0.40g 및 청경채 0.16g의 90%를 우량묘 생산을 위한 최저한계로 간주할 때 각각 0.36g 및 0.144g의 건물중을 생산해야 한다. 또한 90%에 해당하는 건물중을 회귀식에 대입하여 계산하면 기비로 첨가할 질소 농도를 배추 육묘시 $196{\sim}250mg{\cdot}L^{-1}$으로, 청경채 육묘시 $187{\sim}250mg{\cdot}L^{-1}$으로 조절해야 한다고 판단하였다.

• Journal of Biosystems Engineering
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• 제24권5호
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• pp.425-430
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• 1999

Complex environmental control systems were developed, which control properly the pig's environment in windowless pig-housing based on the thermoregulatory behaviors of pigs and concentrations of noxious gases (CO2 and NH3). The this study was conducted to assess the performance of complex environmental control systems by raising weaned piglets and growing pigs under different seasonal conditions. Average daily gain of pigs in the experimental pig-housing was slightly higher than that of pigs in the conventional pig-housing. Average daily gain was not significantly different in winter and spring(P＞0.05), but was significantly different in summer(P＜0.05). Feed conversion rate of pigs in the experimental pig-housing was smaller than that of pigs in the conventional pig-housing. Feed conversion rate was not significantly different in environment for weaned piglets and growing pigs resulted in the improved daily gain, feed conversion rate, and carcass quality of the finishing pigs. These results showed that the performance of the complex environmental control systems in windowless pig-housing was excellent for weaned piglets and growing pigs.

• 생물환경조절학회지
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• 제4권2호
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• pp.167-174
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• 1995

This study was carried out to find a way of improving the windproof capability of greenhouse foundations. Generally, greenhouses are often collapsed due to the strong winds, because they are very light weight structures. In such a critical situations, the foundations are very often subjected to uplift and vibration at the same time. This paper describes both the wind disaster of greenhouses by the typhoon FAEY and the uplift resistance of greenhouse foundations. Followings are the results obtained from this study ; Judging from the view point of year round cultural aspects, it is recommended that some measures be taken for the preventions of greenhouse film ruptures because greenhouse structural damages are found to be directly associated with the local rupture of cover film. In the case of surveyed area, movable pipe-houses or pipe-houses of 1-2W type were found to be completely destroyed when the maximum instantaneous wind velocity was over 30m/sec or so. In the case of movable pipe-houses, the uplift resistance of greenhouse was expected to increase with the increase of pipe diameter and/or the embedment pipe length. But at present situations there is a limitation in raising the uplift resistance of movable pipe-house, because pipe diameters as well as pipe lengths customarily selected by farmers are quite a much limited.

• 한국콘텐츠학회논문지
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• 제3권1호
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• pp.71-79
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• 2003

현재까지는 해양 어류의 생태와 양식과정 등을 연구하기 위해서 연구자가 직접 육안으로 실험환경을 관찰하였으며, 양어장의 영상, 온도와 같은 상태 등의 정보를 실험실 내에서만 모니터링 할 수 있었다. 기존의 이러한 방식은 과학적이고 체계적인 방법으로 어류의 생태를 관찰할 수 없고, 많은 연구 인력이 필요하다. 따라서 본 논문에서는 리눅스를 운영체제로 사용한 임베디드 시스템을 이용하여 원격지의 실험환경 상태를 언제, 어디서든 인터넷을 통하여 실시간으로 전송 받아, 그 상태를 종합적으로 검사 및 분석할 수 있는 양어장 모니터링 시스템을 설계 및 구현한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1095-1098
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• 2005

Most electronic chassis control systems until today have been designed with optimization on its own performance. However, According to the increase of the interest regarding a vehicle safety and development of information technique, the integration technique of current chassis systems is being emphasized. Each enterprise proposed it with name of GCC(Global Chassis Control) or UCC(Unified Chassis Control). This study realizes control algorithm of suspension and brake by using the vehicle model of low degree of freedom as the primary stage of realization of integrated chassis control system. The proposed algorithm build the simulation environment connected to the CarSim having full vehicle model of 27 degree of freedom for raising the thrust of results

• 한국항해항만학회지
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• 제28권6호
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• pp.573-578
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• 2004

해조류의 증식에 가장 큰 영향을 주는 것은 증식에 필요한 영양소와 적절한 수온 등 성장환경을 적절하게 유지시킬 필요가 있으나 해조류의 종류가 매우 다양하여 이들 각각에 개별적으로 대처하는 것이 매우 어렵다. 그러므로 본 연구에서는 실제의 미생물이 서식하고 있는 원수를 이용하여 적절한 온도를 유지시켜 미생물의 증식을 촉진시키고 이러한 미생물의 개체수를 측정하는 센서를 개발하였다. 이 센서를 이용하면 해조류의 양이 갑자기 증가하는 초기상황을 찾아낼 수 있으므로 해조류의 급격한 증식을 미리 예측할 수 있다.