• 한국재난정보학회 논문집
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• 제18권2호
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• pp.314-323
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• 2022

연구목적: 개정된 산업안전보건법의 사업주의 책임 및 의무확대와 발주자의 사업주 평가가 안전관리 시스템 개선에 어떠한 영향을 주는지에 대하여 연구하고자 한다. 연구방법: 선행연구의 내용과 분석 결과를 비교하여 학술적 논의를 실시하였다. 선행연구로부터 수집한 측정도구로 설문지를 제작하였고, 수집된 데이터로 통계적인 다중 회귀분석를 실시하였다. 연구결과:연구가설 사업주의 책임 및 의무 확대와 발주자의 사업주 평가 강화가 안전관리시스템 개선에 정(+)의 영향을 미치는 것으로 나타났다. 결론:사업주의 책임 및 의무 확대와 발주자의 사업주 평가 강화는 건설재해예방을 위한 건설 안전관리시스템 개선에 긍정적인 영향을 주고 있다.

• 한국물환경학회지
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• 제36권3호
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• pp.245-254
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• 2020

Water quality improvement projects are being implemented without predicting the effect of water quality improvement on Lake Sapgyo. As the method of selecting the target stream for the effective conduct of water quality improvement projects the method of rating the streams were studied. To build a stream grading method, 60 major streams in the Lake Sapgyo system were monitored. The selection method of rivers subject to priority management for water quality improvement was applied to the stream grading method using the Analytic Hierarchy Process (AHP). The analysis of importance by site by stream grading method revealed the following: water quality (36.0%), flow (26.1%), travel load (13.4%), TMDL density (12.0%), TMDL (8.9%), and area (3.7%). The pollution level of the river was scored by using the stream grading method, and the ranking of 51 streams was calculated. Based on this, the group was classified into six grades (A-F). Among the groups, the F and E groups were selected as the priority management streams. Cheonan-Cheon (Cheonan City) was selected as the first stream to establish water quality improvement measures in the Lake Sapgyo system, and Seowoo-Cheon (Dangjin City) was selected as the second site, and Oncheon-Cheon (Asan City) was selected as the third site. Each local government is expected to improve the water quality improvement effect with limited resources when establishing and implementing water quality improvement measures for the streams (F group, E group) to be managed in this study.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 가을 학술발표회 논문집
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• pp.41-48
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• 2000

Most land development projects and large scale civil works require a great amount of sand. And sand is also the most favorable material for soft ground improvement. The demand for sand is soaring rapidly due to increased number of projects regardless of its limited supply. Therefore, it is not difficult to predict that sand may become depleted and no longer be available as ground improvement material in the near future. Against this backdrop, developing an inexpensive sand-substitution material with an efficient accessibility will be necessary and urgently called for. So quick lime could be recommended as the substitutional material for sand. Quick lime is now preferred by forward developed nations. If Korea is able to take advantage of its abundant supply, economical efficiency could be achieved through massive production as well as being able to take advantage of utilization of natural resources. In this respect the purpose of this paper was to estimate improvement effect of soft ground though in-situ construction of quick lime pile. In-situ construction was peformed in road construction site of soft clay and in this study quick lime from Dan-yang that was estimated prominently in aspect of engineering characteristics was used. Quick lime piles were installed by 1.5m, 2.0m, 3.0m spacing to confirm improvement effect according to spacing and installed piles are 0.4m in diameter, up to 5m in length and the density of quick piles installed is 1.4 t/㎥. Vibrating wire pore water pressure cell was installed to confirm consolidation characteristics in surrounding of quick lime piles and both laboratory test and field test were carried out to confirm strength increase. In conclusion, soft ground improvement by quick lime piles was confirmed.

• KIEAE Journal
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• 제14권1호
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• pp.31-38
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• 2014

Recently, the coverage of urban forests has been rapidly decreasing as the cities are created and expanding. Consequently, there arise urban problems such as heat island effect, urban flooding, urban desertification and so on. In this context, green roof systems is considered to be an efficient alternative to deal with these problems. However, it is difficult to apply green roof to new buildings since the majority of the buildings in cities are already constructed and the demand for new building constructions is not high enough. Therefore, it should be considered to apply green roof system to existing buildings for resolving various problems. This study evaluates heating and cooling energy consumption based on the combination of passive design factors such as wall, roof, window insulation in addition to a green roof system applied to an existing house by using an energy simulation program. Total 8 potential improvement cases are developed. Each case is applied to the same house with different insulation standard for simulations. Through the analysis of the simulated cases with the chosen test house, it is confirmed that heating energy consumption decreases as improvement cases are applied, but cooling energy consumption is relatively not much affected by each improvement case. In addition, when each improvement case is applied to already highly insulated house, the effect of thermal energy improvement decreases while the same improvement that is applied to the case with low insulated house tends to yield higher improvement rate.

• 펄프종이기술
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• 제30권2호
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• pp.30-39
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• 1998

Effect of cationic starches and anionic colloidal silica on retention and drainage characteristics of Compozil system was investigated. Depending upon the degree of substitution and molecular weight of cationic starches and morphological characteristics of anionic colloidal silica, retention and drainage properties of Compozil system were significantly influenced. When cationic starch addition level increased above a certain limit retention and stock freeness were decreased. To elucidate this an electrostatic coagulation mechanism occurring between unadsorbed starch molecules and anionic colloidal silica was proposed. Unstructured colloidal silica showed greater improvement in retention than structured colloidal silica. Cationic corn starches with different degree of substitution and molecular weights were prepared and their effect as a constituent of Compozil system was also evaluated. By controlling the molecular weight and degree of substitution of cationic corn starch it was possible to achieve significant improvement in fines retention. Cationic corn starch with higher degree of substitution maintained its retention efficiency even when the stock conductivity was increased. Turbidity measurement technique was found to be a simple and useful method to measure the retention characteristics.

• 공학교육연구
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• 제16권6호
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• pp.3-10
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• 2013

The purpose of this study is to design the instructional model to develop logical thinking competency of engineering students and to investigate the effect of the model. The instructional model is composed of the virtual context (films were provided), problem solving, feedback, another problem solving with different perspectives, feedback. The process is looped. The results showed statistically significant improvements between pre- and post-test. The first standardized test of critical thinking showed the improvement from pre-test to post-test (d=0.646). The second test of logical thinking showed the improvement from pre-test to mid-term test (d=0.753) and improvement from mid-term to post-test (d=1.529).

• 대한물리치료과학회지
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• 제8권1호
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• pp.781-786
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• 2001

The purpose of this study is to provide the direction of the policy forwelfare of the home - based service by identifying the problem and improvement of the home - based service. In the fast growing society like korea social welfare policy for the home - based service. The core hypotheses, of this research that home - based services canexpand social support network and improve life satisfaction were aceptedor rejected, In other words, while the home - based services expanded the lold people social support network through the activities of social workers and volunteers, these services considering the findings of the this study, we can conclude that the current home - based services provided by social welfare have an effect upon increasing old peoples social support. But these services have no effect upon improving life satisfaction index.

• 산업경영시스템학회지
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• 제12권20호
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• pp.33-38
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• 1989

In order to achieve the most suitable designing of shoemaking, the structure of shoemaking is described in this study by inquiring into structural and functional effects given by shoes to human feet. Also, the role of insole that is an essential portion in view of function in shoemaking is described and. for the improvement of quality the fact that selection of material of insole has an effect to quality is substantiated through experiments of adhesive tensile and absorption percentage. Though identification of the qualify of insole with the naked eyes is impossible because it is inserted between the internal layers of a shoe. It is not only an essential portion for the improvement of the quality of shoemaking but it gives an essential effect to the sanitation and health of human body(feet) when insole of lower qualify is used. In view of these the improvement and enhancement of the quality of home-made material of insole are earnestly required.

• 한국해양바이오학회지
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• 제9권2호
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• pp.58-64
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• 2017

Polysaccharides are useful materials for keep skin moisturizing and skin improvement cosmetic materials. We have isolated polysaccharides form Gracilariopsis sp. The polysaccharide derived from Gracilariopsis sp. have various size of 300kDa, 500kDa and over 1,000kDa. The volunteers applied a cream formula with polysaccharides from Graciariopsis sp. for 4 weeks. We found significant improvement of wrinkles and skin texture. We also found an effect of improving skin elasticity. When the moisture reduction rate of the skin was 2.8% lower than the 5.1% of hyaluronic acid. The polysaccharide extract from Gracilariopsis sp. showed stable pH and viscosity. The polysaccharides derived from Gracilariopsis sp. could be used as a cosmetic material.

• 아동학회지
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• 제23권1호
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• pp.55-70
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• 2002

The influence of peer collaboration on children's analogical abilities was studied with 120 9-year-old participants. After the pre-test, which determined the analogical level of the children, each child was assigned to 1 of 4 different learning conditions: cued/non-cued peer collaborative learning, or cued/non-cued individual learning conditions. The post-test showed changes in their analogical abilities. That is, results showed that cued peer collaborative learned improved the analogical abilities of the children, but the pattern of improvement was different by prior level of analogical abilities. We explained improvement in analogical ability by the context effect of peer collaborative learning and by the interactive effect of context with basic cognitive abilities of the children. We suggested implications of the present results for educational practice.