• Korean Journal of Agricultural Science
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• v.26 no.1
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• pp.77-83
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• 1999

The populations of microorganisms adhered on rice straws which had been ricked in the fields around Chungchong areas during the winter season from February to March in 1998 were investigated. The number of mesophilic bacteria including bacilli was generally high in the middle part of straw. And it appeared to be higher in the samples from rural areas than those from suburb. Thermophilic bacteria and actinomycetes were rarely to be detected in most samples. Coliform bacteria were detected in a few samples which collected from Kwanpyong-dong of Taejon-city, Jangpyong-meun and Jungsan-meun of Chongyang-koon, indicating that these areas were contaminated by sewage and livestock wastes. Following the fermentation of Chungkukgang employed the middle parts of straws from Mok-meun of Chongyang-koon as a source of microbial inoculum, qualities of the fermented products such as amino-nitrogen content, viscosity and protease activity, were examined: the application of rice straws resulted in better qualities of the fermented products when compared to the control, however the methods of application appeared to have little or no effect on the quality.

• Journal of Korea Technology Innovation Society
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• v.17 no.4
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• pp.763-785
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• 2014

Science, technology and innovation policy (STI policy) is a result of the interactions between the social issues and academic research. Understanding the interactions of the STI policy between the social issues and academic research can throw some light on designing better policies and enhancing the social value of academic research. Thus, this paper explores the interactions of the STI policy between the social issues and academic research using the qualitative content analysis of major newspapers and journal articles in Korea. We have three major findings. First, on the one hand, academic research rose after uprising changes in the STI policy issues in the society. Second, on the other hand, social issues on STI policy were influenced by academic research reflecting the fundamental changes in the Korean innovation system and the nature of technology. Third, there are strong policy demands regarding the role of the STI policy for society and for traditional economic domains, but relevant research is scarce up to now. These findings contribute to uncovering the potential policy domains and agendas for policy makers and researchers.

• Journal of Korea Port Economic Association
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• v.31 no.4
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• pp.39-52
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• 2015

The purpose of this paper is to empirically examine whether there are significant relations among rankings of cross-efficiency, web accessibility, and website evaluation. For this purpose, the study uses the KWAH-4 method developed by the Web Accessibility Laboratory in Korea, website evaluation method developed by the Business Development Bank of Canada (BDC), and the cross-efficiency model for 13 Asian container seaports including Korean, Chinese, and Japanese main ports in 3 years (2009, 2010, and 2013) using data for two cases: three inputs (depth, total area, and number of crane) and one output (TEU) in the first case and three inputs and two outputs (TEU and BDC overall score) in the second case. The main empirical results are as follows. First, the ranking orders of cross-efficiency, web accessibility, and website evaluation overall scores are not significantly correlated with each other. Second, if the BDC overall score is included in the output element, the correlation results are improved. However, the correlation coefficient is still low. The container port policy planners should introduce and consider the web accessibility and website evaluation scores when evaluating an efficiency-increasing plan for Korea's main container ports.

• Reproductive and Developmental Biology
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• v.29 no.1
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• pp.43-48
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• 2005

To search of a new porcine pheromonal odorants for biostimulation control system technologies to offer a potentially useful and practical way to improve reproductive efficiency in livestock species, the holographic quantitative structure activity relationship (HQSAR) model between odorants, 2-phenoxytetrahydrofurane (A), 2-cyclohexyl-oxytetrahydrofurane (B), derivatives and binding affinity constants (p[Od.]/sub 50/) for porcine odorant-binding protein (pOBP) as receptor of pig pheromones were derivated and disscused. The binding affinity constants of cyclohexyl substituents (A) for pOBP were higher (A>B) than that of phenyl substituents (B). It was revealed that the optimum HQSAR model XI using PLS analyses had a fragment length (5∼8) with chirality at 5 components and hologram length 97 bin, which had a cross-validated q²(predictablities) of 0.916, and a conventional correlation coefficient r² (fitness) of 0.988, respectively. From the atomic contribution, the C3 and C5 atom in 2-oxyfuryl group contributed to binding affinity constants, whereas the central carbon atom in tert-butyl group on the cyclohexyl ring and the C4 atom of furyl group parts showed no contribution.

• Journal of the Korea Concrete Institute
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• v.27 no.4
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• pp.331-341
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• 2015

The main purpose of this study is reducing the cost and effort for characterization of tensile strength of fiber reinforced concrete, in order to use in structural design. For this purpose, in this study, test for fiber reinforced concrete was carried out. Because fiber reinforced concrete is consisted of diverse material, it is hard to define the correlation between mix proportions and strength. Therefore, compressive strength test and tensile strength test were carried out for the range of smaller than 100 MPa of compressive strength and 0.25~1% of steel fiber volume fraction. as a results of test, two types of tensile strength were highly affected by compressive strength of concrete. However, increase rate of tensile strength was decreased with increase of compressive strength. Increase rate of tensile strength was decreased with increase of fiber volume fraction. Database was constructed using previous research data. Because estimation equations for tensile strength of fiber reinforced concrete should be multiple variable function, linear regression is hard to apply. Therefore, in this study, we decided to use the ANN(Artificial Neural Network). ANN was constructed using multiple layer perceptron architecture. Sigmoid function was used as transfer function and back propagation training method was used. As a results of prediction using artificial neural network, predicted values of test data and previous research which was randomly selected were well agreed with each other. And the main effective parameters are water-cement ratio and fiber volume fraction.

• Journal of The Korean Association For Science Education
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• v.34 no.3
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• pp.273-283
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• 2014

The purpose of this study was to examine the potential of the use of the Classroom Response System (CRS), a kind of new ICT medium, in a quiz problem-solving oriented high school life science class. To find the usefulness of CRS as a teaching and learning strategy, the CRS group (n=34) sent prompt individual answers to the teachers' questions using the CRS terminal (Clicker), and the teacher then asked additional reasons of the individuals and gave personalized feedback. In the control group (n=35), the CRS was not used while the teacher asked overall questions and gave feedback in an undifferentiated way. As a result, the CRS increased students' interest and concentration during class, but there were no significant differences in study achievement between the two groups. However, there were significant differences between the medium-level groups when the two groups were divided into smaller ones based on their pre-scores. We suggest that, for effective use of the CRS for diagnostic and formative assessment, teachers should develop a teaching and learning strategy that can produce appropriate questions of various levels in advance, investigate the exact reasons for students' answers, and give customized feedback by individual as much as possible.

• Korean Journal of Occupational Health Nursing
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• v.1
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• pp.17-29
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• 1991

본연구는 보건관리자로서의 산업간호사의 역할을 뒷받침 할 수 있는 근무조건을 파악하기 위한 기초조사연구이며 산업간호사의 근무조건 개선에 기여코저 한다. 연구방법은 1991년 3월부터 4월까지 서울, 인천, 경기 지역에 위치한 산업장의 건강관리실에 근무하는 산업간호사 131명을 대상으로 설문지를 이용하여 전화 또는 산업간호사회를 통해 자료를 수집하였다. 조사 결과는 다음과 같다. 1) 조사대상의 일반적 특성 서울, 경기, 인천지역에 상시근로자수가 300인 이상에 근무하는 산업간호사 배치율은 49.3%로 나타났다. 조사대상의 지역별 분포는 서울이 61개사업장이었고 인천 경기의 순이었다. 또한 산업간호사의 교육수준은 전문대졸이 84.0%이었고, 연령별 분포는 20대가 65.7%이었으며, 규모는 500~999사이가 42.7%였고, 노조가 있는 사업장은 73.3%인 것으로 나타났으며 산업간호사 1인이 근무하는 곳이 90.7%였고 보건관리자가 간호사뿐인 곳이 63.3%이며 1000명이상 근로자를 가진 산업체중 31.9%가 전임산업의나 산업위생사 없이 간호사 혼자서 근무하는 것으로 나타났다. 2) 근로조건 산업간호사는 주당근무시간이 44시간이하인 경우가 59.6%였고, 1부제 근무만하는 경우가 93.1%였으며, 월차휴가는 94.7%가 사용할 수 있었으며, 보수는 기본급이 25~40만원 사이가 69.5%였고 면허수당은 43.8%만 받는 것으로 나타났으며 상여금은 년 600%를 받는 산업장이 42%였고 총급여액이 35~55만원을 받는 경우는 전체의 67.3%를 차지하였다. 또한 연장근로인정여부는 일부만 인정하거나 인정하지 않는 경우가 61.8%였고, 과거경력 은 34.4%가 인정하지 않았고 승진은 66.4%가 불가능한 것으로 나타났다. 산업간호사가 별정직이나 촉탁으로 취업한 경우가 35.1%였고 일반 고졸이나 전문대졸 대우를 받고 있는 경우가 68.9%였다. 또한 전문단체활동 지원정도는 대한간호협회나 산업간호사회지원이 95 %를 넘었으며 산업간호사가 원하는 것 모두 지원하는 경우가 68.7%였으며 회비와 참석 모두를 지원하는 경우가 83.7%였다. 3) 모성보호 산업간호사중 81.7%가 결혼 후 근무가 가능했으며, 94.7%가 생리휴가를 사용할 수 있는 것으로 나타났다. 그리고 산전산후휴가는 76.3%가 사용할 수 있었다. 그러나 결혼후 근무나 산전산후휴가는 명문화되어 있었으나 실제로 이용한 경우는 없는 것으로 나타났다. 본 연구결과는 산업간호사의 근무시간, 전문단체활동지원은 비교적 좋은 조건이나 보수를 비롯 승진이나 대우, 모성보호에 대한 개선여지가 있음을 보여주었다. 따라서 결혼후 지속근무, 산전산후 휴가제 등이 보장되어야 전문직으로서의 산업간호사 인력확보, 활용이 용이할 것으로 기대된다. 더불어 전문단체의 조직적 활동과 연구, 행동적인 지원이 계속되어져야 할 것을 제언하는 바이다.

• Korean Journal of Social Welfare
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• v.62 no.2
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• pp.57-85
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• 2010

Using the Survey of Wisconsin Works Families, the survey of the Child Support Demonstration Evaluation (CSDE) project in Wisconsin, this study examines whether the family structures of nonresident fathers and resident mothers are associated with nonresident fathers' economic contributions, measured by the level of informal support provided to their children living in the mothers' households. Findings show that the level of informal support is associated with not only individual and economic characteristics of nonresident fathers and resident mothers, but also family structures and institutional factors such as child support arrangements and the CSDE experiment. Both mothers' repartnering with another man and fathers' repartnering with another woman are negatively associated with the level of informal support. Fathers who lived together with mothers when their children were born provide more informal support than do fathers who did not. Fathers' multiple partner fertility is not associated with the level of informal support provided. Among fathers who have children with multiple partners, fathers provide more informal support to their children born by their first partner. Fathers who have multiple children with the mother of the focal child provide more informal support. Fathers who have other biological children living elsewhere provide less informal support. Fathers who pay higher levels of formal child support also provide higher levels of informal support. Fathers associated mothers assigned to the CSDE experiment group provide more informal support. The findings suggest that child support programs may increase informal support, thereby improving the well-being of resident mothers and their children living in poverty.

• Journal of Korean Society of Forest Science
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• v.81 no.4
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• pp.303-309
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• 1992

This study eras carried out to investigate the ecological changes on the plant community at erosion controlled area in Yoju-gun, Kyonggi-do. The results of the study were as follows : 1. The depth of organic matters in the soil profile from 4 to 14 years was estimated to be $Y_{(cm)}=0.436X_{(yr)}-0.931$(r=0.978), and 02 layer was $Y_{(cm)}=0.339_{(yr)}-0.931$ (r=0.954). 2. On upper plant layer. Alnus spp. was decreased, on an average, 32% of relative coverage, 12.4% of relative density and 16.8% of relative frequency in each plot for 3 years, as this area was damaged by Agelastica coerulea Baly for 2-3 years. 3. On upper plant layer, relative coverage of Pinus spp. was increased after 6, 7 years in erosion controlled area and was taked the highest plant (more then 40%) from 10 to 14 years. 4. On lower plant layer, relative density of Quercus ssp. (these species has not been planted and sown on erosin controlling) was increased all the plot. 5. The increase of the whole crown projection area was estimated to be $Y_{(m^2)}=18.020X_{(yr)}+18.834$(r=0.954) 6. The biomass was estimated to be 14.88t/ha on elapsed 6 years, 22.84t/ha on 8 years, 35.08t/ha on 10 years, 47.80t/ha on 12 years, 58.13t/ha on 14 years.

• The Journal of Engineering Geology
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• v.7 no.3
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• pp.173-189
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• 1997

A study on the geological structure and geothermal gradient distribution was carried out to evaluate the feasibility of developing a new geothermal field in the Yusong area. It is suggested that geothermal water in the Yusong area is closely related with faults, dykes, and their dipping characteristics with the study of geothermal gradient distribution. A fault of EW direction locates in northern boundary of the study area and another fault of N40{\citc}W$ crosses the EW fault at the western part of the study area. Locations of faults are recognized quite well by lineaments, geophysical exploration and geothermal gradient distribution characteristics. Three sets of dyke are found in the study area. According to the result of the geothermal gradient distribution study, the location of geothermal anomaly belt and dykes coincide each other, and the area has the temperature gradient of larger than 3$^{\circ}C$ between the depths of 0.5m and 1.0m below ground surface. The thermal anomaly belt those temperature gradient is larger than 2.5$^{\circ}C$ between the depths of 0.5m and 1.Om below ground surface is expected in the direction of N80{\citc}W$ in the study area. The dirping of dyke is almost vertical according to the linear distribution of dykes on surface and the results of geophysical survey. From the distribution of geothermal anomaly belt and the locations of dyke, three locations for the development of hot spring water could be recommended and the depth that ensure over 4$0^{\circ}C$ geotheraral water is estimated as 170~200m below the ground surface.