• 월간 기계설비
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• s.226
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• pp.53-57
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• 2009

그동안 많은 논란이 있었던 석면문제가 또다시 도마 위에 올랐다. 최근 아기에게 바르는 파우더를 비롯하여 화장품 등에까지 석면공포가 확산됨에 따라 환경부는 석면이 주로 건축자재(80% 이상)에 사용된 만큼 국민건강 보호를 위해 건축물에 사용된 석면의 안전한 관리가 무엇보다 중요하다고 판단, 가이드라인을 제정, 시행에 들어갔다. 가이드라인의 주요 내용은 $\Delta$건축물에 사용된 석면함유 설비 또는 자재를 조사하여 석면지도 작성 및 6개월마다 훼손 여부 평가 관리 $\Delta$석면 해체 제거작업 과정에서 석면이 비산되지 않도록 주변 대기 중 석면농도 0.01개/cc(실내공기질 권고기준) 기준 설정 $\Delta$석면 해체 제거 작업 및 폐석면 처리 시 안전한 석면관리를 위한 준수사항 등이다. 이번 가이드라인은 건축물 사용단계부터 철거 폐기까지 전 생에에 걸친 석면 관리 방법 및 기준 등을 포함하고 있어 건축물 이용자, 철거지역 인근 주민의 석면 노출 차단에 기여할 것으로 기대된다. 환경부는 가이드라인을 자치단체, 다중이용시설 관리자, 건축물 철거업체 등을 통해 널리 알리는 한편, 노동부 등 관계부처와 함께 관련제도 보완 등 건축물 석면관리 개선방안을 오는 6월까지 마련할 계획이다.

• 한국벤처창업학회:학술대회논문집
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• 2018.04a
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• pp.43-47
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• 2018

최근 앙트러프러너십을 독자적인 학문의 영역으로 정의하고자하는 노력들이 진행되고 있다. Shane & Venkataraman 등의 학자들은 앙트러프러너십의 연구가 창업자가 되기 위한 사람들에 대한 관심에서 창업가 기질이 있는 개인과 가치있는 기회의 결합을 이해하는 것 쪽으로 옮겨져 가고 있다고 하였다. 한국은 대학을 기반으로 기업가정신교육 또는 창업교육이라는 이름하에 교육이 확산되고 있는 실정이며, 2010년 국내 최초로 숙명여자대학교에서 앙트프러너십 전공학과가 생성되기도 하였다. 기존의 연구를 통해 창업교육이 창업의지에 긍정적인 영향을 미친다는 다수의 연구 결과가 발표되었으나, 창업학의 학문적 차별성이라 주장하는 'opportunity'에 대한 연구는 미흡한 실정이다. 또한, 국내 유일의 앙트러프러너십 전공생들을 대상으로 앙트러프러너십 교육의 품질요인이 전공생들의 기회인식에 어떠한 영향을 주는지, 또한 창업자기효능감 및 교육의 몰입도에 따라 어떠한 영향을 미치는지에 밝혀진 바는 없다. 본 연구를 통해 앙트러프러너십 전공교육의 만족도가 창업기회인식에 어떠한 영향을 미치는지 검증하고, 교육의 몰입도에 따라 창업기회인식의 매개효과에 대해 살펴보고자 한다.

• Proceedings of the SAREK Conference
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• 2005.11a
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• pp.9-14
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• 2005

The purpose of this study is to predict VOCs emission rates from multi-layers materials, which are composed of single-layer materials having various VOCs emission rates, by using effective diffusion coefficients of the single-layer materials. The study was consisted of two parts; the one is the prediction of VOCs emission rates from multi-layer materials through numerical methods. The other is the measurement of VOCs emissions rates of wall composite and floor composite in Mock-up rooms for comparing the prediction and the experiments' values. The results of the study show that the short-term VOCs emission rates of multi-layers materials can be predicted from the effective diffusion coefficients of single materials in odor accuracy.

• KSBB Journal
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• v.11 no.1
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• pp.30-36
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• 1996

Based on fermentation data for cyclosporin A production, simple Monod kinetics was proposed for both immobilized and suspended cultures. Higher value of $\mu$mas and lower value of Km suggest better catalytic activity of the immobilized cells than the parallel suspended cells. Furthermore, lower Km value in the immobilized cell system indicates higher affinity of the immobilized cells for carbon substrate as compared with the suspended cells. For immobilized cell cultures, these parameters were also utilized for the estimation of effectiveness factor, an indicator for intraparticle mass transfer resistance. Based on simulation studies, optimum radius of celite beads was turned out $100 ~ 500{\mu}m$In this simulation work, we examined the influence of biosupport size and immobilized biomass density on diffusional resistance of substrate inside the bead matrix. In order to maintain uniformly distributed cell activities in biosupport, it was essential to determine optimum slze of particle, and then to estimate the most economic loaded biomass content.

• Journal of Life Science
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• v.21 no.9
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• pp.1323-1328
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• 2011

We herein report the development of an agarose-gel-immobilized recombinant bacterial biosensor simple system for the field monitoring of phenolic compounds. Escherichia coli cells harboring the pLZCapR plasmid, which was previously designed to express the ${\beta}$-galactosidase reporter gene in the presence of phenolic compounds, were co-immobilized with a substrate [chlorophenol red ${\beta}$-galactopyranoside (CPRG) in agarose gel, and dispensed to the wells of a 96-well plate. Field samples were added to the wells and color development was monitored. In the presence of 5 ${\mu}M$ to 10 mM of phenol, the biosensor developed a red (representing hydrolysis of CPRG) color. Other phenolic compounds were also detected by this immobilized system, with the pattern resembling that previously reported for the corresponding non-immobilized biosensor. The immobilized cells showed optimum activity when the gel was simultaneously supplemented with 6% dimethyl formamide (DMF), 0.1% SDS and 10 mM $CaCl_2$. The immobilized biosensor described herein does not require the addition of a substrate or the use of unwieldy instruments or sample pretreatments that could complicate field studies.

• Korean Journal of Child Care and Education Policy
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• v.12 no.3
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• pp.55-76
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• 2018

The study aims to investigate nocturnal sleep duration in 4-year-olds and relative effects of various factors including the personal factor (temperament), the familial factor (mother's employment status), the time-use factors (hours spent in childhood educare institutions, on napping in the institutions, and on using electronic media). The data of 937 4-year-olds collected by the Korea Children and Youth Panel Survey in 2012 was analyzed. Using SPSS 21.0 program, frequency analysis, descriptive statistics, Pearson's correlation analysis and hierarchical regression were conducted. The results are as follows. First, there were significant negative correlations among the personal factor, familial factor and time-use factors. Finally, the time-use factors showed largest explanatory power on variance of children's nocturnal sleep duration, followed by the familial factor. But the personal factor was not statistically significant. These results suggested that parents and childhood educare institutions need to cooperate in order for children to sleep well. It is also necessary to implement and spread the social systems to support healthy development of children.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.20 no.5
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• pp.391-407
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• 1987

To understand the effects of the cooling water system of the power plant on the succession of sessile zoobenthos, a series of experiments were carried out at the cooling water system of Samchonpo Power Plant from Hay 1985 to May 1986. The lowest species diversity of the zoobenthos was observed at the discharge canal. This is probably caused by both increased velocity and temperature of circulating water. It is also noticeable that species composition of the zoobenthos, to a certain degree, was affected due to the impingement of meroplankton during the entrainment process. While the number of species attached on the experimental substrata installed in the thermally altered area is smaller than that in the intake canal, the biomass is increased as the increased temperature eliminates some species and in turn stimulates reproduction and growth of the others. It is interesting that relatively high similarity exists between the summer communities in the intake canal and the spring communities in the thermally altered area, and the same relationship is also found between the fall communities in the intake canal and the winter communities in the thermally altered area. Ecological index curves of the zoobenthos of the intake canal follows the fluctuation pattern of the thermally altered area in one or two months of elapsed time, probably due to temperature increase by the inflow of heated water discharged from the power plant.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.8
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• pp.1124-1131
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• 2011

This study performed the prediction about the indoor contaminant's diffusion characteristics which can be affected by the mechanical ventilation system on a training ship. The results are as followings. It is clear that the contaminants are spread to most of the indoors, regardless of the contamination beginning zone. About 65~100 minutes later, the contaminant densities of whole indoor zones are evaluated as clean. Comparing the contamination beginning zone being located at higher deck(scenario A) to the contamination beginning zone being located at lower deck(scenario B), although the contaminant density by scenario A is 10 times higher than that by scenario B, the number of contaminated zones are 50% less. The contaminant densities are evaluated as to be rapidly decreased when the outside air induction ratio against design volume is over 75%.

• Parasites, Hosts and Diseases
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• v.35 no.2
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• pp.135-138
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• 1997

This study was performed to observe intestinal patholoay ill early Infection by Centrocestus crnlctus. The flukes were in the lowermost part of the intfrvillous space of the duodenum and jejunum from 1 day to 7 days postinfection (PI). Thr stroma of villi around the young fluke was edematous and infiltrated by inflanlrllatory knells Luch as Iymphocytes, plasma cells and eosinophils. The crypt became mildly llyperplastic and villi were moderately atrophied at 4 days Pl. The intestinal lesion produced was confillrd to the areas around the fluke. The pathologic findings were not significarltly different between 1,000 and 5,000 metacercariae infection groups. It is suggested that the lesion should be produced by mechanical destruction of the fluke on the enteroepithelial cells.

• Korean Journal of Crystallography
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• v.7 no.2
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• pp.120-125
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• 1996

Single crystals of deoxy-thymidine diphosphate-D-gluxose-4,6-dehydratase(abbreviated as dTDP-D-glucose dehydratase) from Escherichia coli Strain BL21 clone which harbors the gene of dTDP-D-glucose dehydratase in Salmonella typhimurium LT2 have been grown with and whithout substrates by sitting drop vapor diffusion at room temperature. The precipitating agent was 1.6 to 2.0 M Na, K phosphate buffer(pH 8.0). The crystals diffract to at least 2.5Å and belong to the hexagonal space group P61 with cell dimensions a=b=168.54Å, c=81.08Å. The asymmetric unit contains one dimer with a crystal volume per protein mass(VM) of 2.4Å3/Da and solvent content (Vsol) of 64% by volume.