• 한국환경복원기술학회지
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• 제13권4호
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• pp.42-51
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• 2010

The purpose of this study is to analyze the characteristics of environment-friendliness of Root Barrier materials based on comprehensive experiments on harmfulness of Root Barrier materials and fish toxicity of Oryzias latipes mortality to verify eco-toxicity of each method of construction and Root Barrier material, which are to be applied by taking eco-toxicity into account when building ecological flows in upper areas on natural and artificial grounds. As a result, the following conclusions have been reached in this study: 1. In regard of the harmfulness analyzed, each material showed a different result of analytical value in each lab tank. Compared to lab tank, pH (la), DO (lb), T-N (VI) and T-coli (la) were in the same grade, but COD, SS, T-P and F-coli were less than that of control, respectively increased or decreased by material were analyzed. 2. In the experiment of fish toxicity, Barrier sheet was found to have 66.7% of fish mortality, indicating strong fish toxicity. Synthetic rubber system root barrier sheet (20.0%) was analyzed to have medium fish toxicity, while Synthetic resin system root barrier-waterproof sheet (3.3%), Synthetic rubber system membrane root barrier sheet (3.3%) and Synthetic resin system root barrier sheet (0.0%) showed relatively lower mortality and fish toxicity. To sum up such results as found in the experiment mentioned so far, the values of harmfulness and root penetration resistance analyzed were different in each lab tank, but there was absolutely little correlation with the mortality gained from the experiment on fish toxicity. In the experiment of fish toxicity, environment-friendly root barrier materials were analyzed, and it was found that Synthetic resin system root barrier sheet, Synthetic resin system root barrier waterproof sheet and Synthetic rubber system membrane root barrier sheet are highly environment-friendly. In contrast, Synthetic rubber system root barrier sheet was found to have medium-level environment-friendliness. Also, Barrier sheet was analyzed to have low environment-friendliness.

• 한국화재소방학회논문지
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• 제30권5호
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• pp.9-17
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• 2016

중규모 도로터널의 경우 제연설비 설치가 의무화 되어있지 않기 때문에 화재가 발생할 경우 이용객들이 많은 피해를 입을 수 있다. 따라서 본 연구에서는 연장 1,000 m 2차로 일방통행방식의 도로터널을 대상으로 3차원 수치해석, 정량적 위험도 평가를 통해 제연경계벽이 설치되지 않을 때와 설치간격이 100, 150, 200, 250 m일 때 화재에 의하여 발생되는 연기류 등이 시간에 따른 확산을 분석하였다. 그 결과 중규모 도로터널에 제연경계벽을 설치할 경우 설치하지 않은 경우보다 화재로부터 발생되는 고온의 공기와 독성가스의 확산이 지연되는 것을 확인할 수 있었다. 또한 수치해석 대상 중에서 제연경계벽의 설치간격이 100 m인 경우 화재로 인해 발생된 고온의 공기와 독성가스의 확산이 다른 경우보다 많이 지연되어 터널 이용객이 피난하는데 가장 적합한 것으로 나타났다.

• 한국의류학회지
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• 제27권8호
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• pp.935-945
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• 2003

This study attempts to understand perceived switching barriers of customers and fashion stores service quality as a core of store loyalty. Medium variations of switching barriers are interpersonal relationships, attractiveness of alternatives and switching costs. Date were collected from 485 subjects who finished their shopping with a self-administered questionnaire. The results were as follows: 1. Classified service quality of clothing stores into 4 ways: VMD of stores or atmosphere, store policy which are involved in store service, sales persons respond and sales persons conviction which are involved in sales service. 2. Service quality of fashion stores is related with switching barrier medium variations. 3. Service quality have an influence on switching barrier medium variations. Its mutual influences increase switching barriers and it gets to be related to the store loyalty. 4. Compared influences of variations to store loyalty between the H department store and the L department store which are research objects. The main difference is that the H department store evaluated personal relationships among service quality, customers and sales persons high compared with the L department store. As the results showed, service quality consists of store service of nonpersonal service area and sales service of personal service. Service quality is related with interpersonal relationships, attractiveness of alternatives and switching costs. It also affects switching barriers and store loyalty.

• Journal of Korean Neurosurgical Society
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• 제48권6호
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• pp.524-527
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• 2010

Temporary disruption of the blood-brain barrier (BBB) after cerebral angiography is presumably caused by nonionic radiographic contrast medium (CM). We hereby report a case of 58-year-old woman who developed decreased mentality, global aphasia and aggravated right hemiparesis after cerebral angiography. Brain CT examination demonstrated gyriform enhancement throughout the left cerebral cortex and thalamus. MR diffusion did not reveal acute infarction. MR angiography did not show any stenosis, spasm or occlusion at the major cerebral vessels. Follow-up CT scan after 1 day did not show any gyriform enhancement. Worsened neurologic signs and symptoms were improved completely after 7 days. In the present study, disruption of the BBB with contrast medium after angiography seems to be the causative factor of transient neurologic deterioration.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제18권2호
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• pp.33-43
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• 2012

This study purposes to present the improvement on the index by analyzing concretely the certification and evaluation index and the actual certification acquisition focusing on the buildings acquiring the barrier-free (BF) certification. So, after analyzing the screening results of the buildings acquiring the BF certification and then grasping the general application level based on the above analysis, this study tries to present the improvement on the BF certification index by analyzing the detailed applications of the BF certification-acquired buildings and then grasping the problems on the evaluation index of the current certification system. It was analyzed that the items which applied the BF construction method generalized to the common buildings through the Act on the Promotion of Convenience in medium facilities and the items with higher distribution points were shown as high in terms of points and the acquired point level of items which influenced by the shape and condition of side and land to defile the appearance of buildings were low.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 봄 학술발표회 논문집
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• pp.489-495
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• 2000

When microorganisms such as bacteria and fungi are injected into porous medium such as soils along with appropriate substrate and nutrients, biomass retained in the soil pore. Soil pore size and shape are varied from the initial condition as a result of biofilm formation, which make hydraulic conductivity reduced. In this research, hydraulic conductivity reduction was measured after microorganism are inoculated and cultured with synthetic substrates and nutrients. Biomass-soil mixture was evaluated its applicability to the field condition as an alternative liner material in landfill by measuring hydraulic conductivity change after repetitive freeze-thaw cycles.

• 대한환경공학회지
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• 제22권5호
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• pp.927-938
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• 2000

박테리아를 토양과 같은 다공성 매질에 주입시키고 적절한 기질과 영양분을 공급시키면 박테리아는 매질의 표면에 부착하여 성장한다. 그 결과 바이오필름이 생성되어 공극의 크기가 감소하여 매질의 투수계수가 감소되며, 오염물질을 분해시키는 생물학적 오염분해 능력을 갖게 된다. 본 연구는 투수계수가 비교적 큰 모래와 화강풍화토에 박테리아를 접종, 배양한 후 토양의 투수계수의 변화를 측정하였으며, 배양된 바이오필름의 화학물질에 대한 저항성 및 온도변화에 대한 내구성 실험을 통해 대용 차수재로의 가능성을 평가하였다. 또한 bio-barrier의 유기물질 분해능 및 bio-barrier의 두께에 따른 미생물의 생장도를 column test를 통하여 측정하여 bio-barrier 내에서의 기질의 이동 및 생분해와 박테리아 농도의 분포 변화간의 관계를 제시하였다.

• 대한토목학회논문집
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• 제30권6D호
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• pp.605-613
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• 2010

본 연구에서는 소형차도로 방호울타리 형식선정의 필수요소인 충돌계수 분석 및 방호울타리 높이 선정을 위해 현재의 기준을 적용하는 과정에서 생긴 문제점을 파악하여 개선점을 제시하고 이를 해외기준과 비교분석하여 방호울타리의 형식결정을 위한 기준을 제시하였다. 이를 위해 소형차관련 사고사례분석을 실시하였고, 사고사례를 토대로 방호울타리의 형식선정에 중요인자인 충돌각도, 충돌차량, 충돌속도를 비교 분석 및 소형차 방호울타리의 소요높이를 결정하였다. 충돌각도의 경우 편도 2차로 고속도로 사고사례를 분석하여 유럽 RISER 연구 결과와 비교하여 상향조정의 필요성을 도출하였다. 충돌차량의 경우 경차, 소형승용차, 중형 및 대형승용차, 승용차(SUV), 승합차 및 소형 트럭으로 나누어 분석을 실시하였으며, 충돌사고소형차 사고누적율에 기반한 차량중량 및 충돌속도를 회귀분석하였으며 수도권고속도로 누적통행비율을 감안 충돌중량을 결정하였다. 또한 그 결과를 토대로 소형차도로 방호울타리 높이를 계산하였다. 본 연구의 결과는 향후 소형차도로 형식선정에 중요한 인자가 된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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• pp.1151-1154
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• 2003

Ultraviolet rays, OH H O radical and $O_3$ produced by the streamer discharge in water are widely used to deactivate microorganisms and remove organic contaminants in water and the dominant factor of these decomposition is the oxidized reaction of hydrogen peroxide and dissolved $O_3$ in water. In this paper, the barrier discharge was used to create plasma in a gas, liquid and solid medium and the electrode with the reactor combined barrier with packed type(BPR) was made as noncontact way against water so that the effect of water characteristic change by the erosion of electrodes exposing in water should be minimized. The active radical and $O_3$ gas generated in plasma region were reacted into the water as electrode so that at the same time a dissolved $O_3$ and hydrogen peroxide were formed in water and The change of pH and conductivity were measured.

• 무역상무연구
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• 제33권
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• pp.311-343
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• 2007

At present, more than 80% export made by Korean small-medium sized companies is OEM(Original Equipment Manufacturing). But OEM export of made-in korea products has been facing limitations from 1990s. Some leading companies among those small-medium sized companies which have been fulfilling OEM export are transferring their exporting strategies to Own Brand or ODM(Original Development/Design Manufacturing) and some of their strategies successful. However, most of small-medium sized OEM exporting companies are still groping for some ways to upgrading to Own Brand or ODM exporting strategies. Therefore, this article deals with how the leading ODM exporting companies have been transferred from OEM to ODM exporting strategies. It also discusses the primary factors of success and barrier and how to develop the ODM exporting strategies based on investigating literature and interviews with the leading ODM exporting companies.