• 한국환경교육학회지:환경교육
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• 제16권1호
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• pp.48-60
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• 2003

This study is aimed at providing an analysis on the re-training needs in for environmental sector as well as on the current status on the employment of technicians in the environmental industry. The questionnaires of 450 technicians employed in 993 environmental businesses are collected. The survey questions were composed mainly of current status on the employment of technicians in the environmental field, specialty and duty in the working place, the relations with a licence, the level of satisfactory to duties and intention to leave hls/her job, difficultles in the working coditions, experiences of training related environmental techniques during a recent year, and the needs of re-training in the environmental industry. The policies on custom-oriented retraining and technical education, on the curricula by sector, on the establishment of retraining.

• 한국안전학회지
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• 제7권3호
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• pp.99-107
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• 1992

Weld bonding can be applied as a combined method of spot welding and adhesive to have more advantages than those. Weld bonding has many merits that enlarge the fatigue strength of spot Welding and also improve the creep of adhesive. But it has not beer proved well in the various environmental conditions. In this study, weld bonding test for fatigue properties and tensile strength is presented under such various coditions as temperatures, humidity, and etc.

• 환경영향평가
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• 제15권1호
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• pp.35-43
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• 2006

The eutrophication in lakes is caused by the inflow of excessive nitrogen and phosphorus, which are not only pollutants to reduce the value of water resource but also nutrients for algae growth that debases water quality. Several methods have been used to judge the eutrophication grades of lakes, but the judgment results can be different with one another even under same coditions because each method is different in judgment items and their standards. A method for overcoming the problem with the judgment of eutrophication grades is, therefore, developed in this study with the application of fuzzy theory. This method allows decision makers to represent the uncertainties (differences) of results by the existing judgment methods and also incorporate associated uncertainties directly into the judgment process, so the judgment results can be made that are more realistic and consistent than those made without taking uncertainty in account.

• KSBB Journal
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• 제13권6호
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• pp.662-668
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• 1998

Viruses belonging to the Hantavirus genus cause two acute severe illness in humans, i.e., Haemorrhagic Fever with Renal Syndrome (HFRS) and Hantavirus Pulmonary Syndrome(HPS). Among them, Hantaan virus is one of the most important viruses causing HFRS. Recombinant expression vectors, pKK-NP and pET-NP, with Hantaan viral nucleocapsid gene were constructed, and used to transform Eschericia coli BL21(DE3). Stability of the vectors in the host strain, and effects of some environmental conditions on the expression of nucleocapsid gene were studied. Expression vector, pKK-NP, was very unstable, and the expression level of nucleocapsid gene was very low compared to that of pET-NP. BL21(pET-NP) produced about 100 mg of N protein per liter of culture broth. Induction time did not show any significant difference on the expression level of nucleocapsid gen and cell growth. BL21(pET-NP) culture at 35$^{\circ}C$ showed a little higher expression level than at 30$^{\circ}C$ during growth phase, but reached to the same level at stationary phase. Total expression level was proportional to supplemented glucose concentration of media up to 0.5% along with cell growth, but expression level per unit cell mass was inversely proportional to glucose concentration and maximal when glucose was not supplemented at all.

• 한국주거학회논문집
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• 제8권2호
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• pp.135-145
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• 1997

The purpose of this study was to investigate the space feature of private kindergarten in Taegu city. This study was conducted by means of the observation on the equipments, the actual measurement of space of kindergarten and environment, and the questionnaire survey by the chief of kindergarten. The samples for analysis were 20 kindergartens on Taegu city. The Major findings were as follows :1) The chiefs of kindergartens were generally satisfied with the whole range of institutions and it's management.2) Generally the environmental coditions were satisfactory, but the design of the equipments had no consideration for children's body size.3) According to observation on the equipment, it was found that generally environment of kindergarten were desireable.

• 대한토목학회논문집
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• 제9권3호
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• pp.39-48
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• 1989

매스콘크리트(mass concrete)는 시멘트의 수화숙(水和熟)에 의하여 온도응력(溫度應力)이 생기며, 균열(龜裂)을 일으키게 된다. 매스콘크리트 내부(內部) 온도(溫度) 해석(解析)에는 Carlson의 방법(方法)이나, Glover의 방법(方法) 등이 오늘날까지 많이 쓰여 왔으나 이 방법(方法)들은 공학적(工學的)으로 간단한 가정(假定)을 하여 온도(溫度) 해석(解析)하고 있으므로, 실체적인 추정치(推定値)가 되지 못 한다고 알려져 있다. 본(本) 연구(硏究)에서는 유한차분법(有限差分法)(FDM)에 의하여 콘크리트 댐의 내부온도(內部溫度)를 해석(解析)하고, 이것의 유용성(有用性)을 검토(檢討)하기 위하여 계산기(計算機)로 계산한 계산치(計算値)와 충주(忠州) 대에서 실측(實測)한 실측치(實測値)를 비교검토(比較檢討)한 결과 좋은 근사치(近似値)를 얻었다.