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임지선,박성수,이강무,김소현,남성원,Yoo Jin Oh,조윌렴,Hyun Sun Yun,Sae-Hun Kim,오세종 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.11
Biofilm contains heterogeneous three-dimensional structures composed of extracellular polymeric substance (EPS), which are greatly influenced by flow conditions. Here, we report a microfluidic platform highly suitable for nanoscale investigation of biofilms formed under laminar flows. This is possible because biofilms formed on glass beads having an average diameter of about 200 μm in the microfluidic device can be easily taken out and located for imaging under high resolution microscopes, such as atomic force microscope (AFM) and scanning electron microscope (SEM). Escherichia coli formed biofilms in the device at various flow conditions (0-50 μL min−1) for several days. SEM showed nanopores (14-100 nm) in biofilm at lower flow rates (0.5 and 5 μL min−1) only at within 3 days, while such small pores were not observed at higher flow rates (50 μL min−1) during the entire culture period (0-5 days). AFM results showed that the surface coverage and roughness of biofilm increased as the flow rate increased. These results suggest that like turbulent flow regime flow rates under laminar flow regime greatly influence on the morphology of biofilms in both micro- and nanoscales., SEM
활동보조서비스를 이용하는 지체 뇌병변장애인의 자기결정의 구성요소와 자기결정의 실현
임지선 한국장애인복지학회 2008 한국장애인복지학 Vol.- No.9
The main purpose for this study is to find out components of self-determination by mobility disabilities and practiced self-determination of mobility disability who are using personal assistance services. This study is attended according to case-study which is one of the qualitative research method, and researchers progressed with agreement for research participation after choosing 8 mobility disability. Data collection is given from interview according to open-ended questionaries. The results of the study are as the followings. First, mobility disability who use personal assistance services are concreted their components of self-determination as a 'obstacles of self-determination', 'choice', 'management and control'. Second, we can find out Each components of self-determination have a corelation. 'obstacles of self-determination' have a effect on 'choice', 'management and control'. 'Choice', 'management and control' have a effect on practiced self-determination. Third, we can find out mobility disability who are using personal assistance services's practiced self-determination are 'practiced choice', 'develop of ability', 'give to information', 'negotiate', 'make a role'. From, the findings of the study, the following suggestions are provided in this paper. First, for self-determination's spread and satisfaction of mobility disability who use personal assistance services, we need to extense personal assistance services time. Second, for self-determination's spread and satisfaction of mobility disability who use personal assistance services, we need to extense of choice right about person who give personal assistance services.
초임계 추출을 통한 커피 디카페인 과정에서의 트리고넬린과 클로로겐산 손실 최소화를 위한 최적화 연구
임지선,이승은,김성준,송봉근,박영권,이홍식 한국청정기술학회 2024 청정기술 Vol.30 No.3
본 연구는 초임계 추출법을 이용하여 커피 생두에서 카페인을 효율적으로 제거하면서도 주요 향미 성분인 트리고넬린과 클로로겐산을 보존하는 최적의 조건을 찾고자 하였다. 다양한 전처리 조건과 초임계 추출 조건을 통해 실험한 결과 수, 분 함량이 35%인 생두를 열수 불림하였을 때 카페인 추출률이 90.6%로 가장 높았고 트리고넬린과 클로로겐산의 보존, 율은 다소 낮아지는 경향을 보였다. 초임계 추출 시간에 따른 실험에서는 시간이 증가함에 따라 카페인 함량이 감소하였 고, 온도와 압력이60 oC와 40MPa 일 때의 조건에서 추출한 생두가 카페인 제거와 향미 성분 보존에 가장 효과적이었다. 물의 투입량이 높아짐에 따라 카페인 추출률이 높아졌으나, 향미 성분의 손실도 증가하는 경향이 나타났다. 용매 원료 비가 증가함에 따라 카페인 제거율은 상승하였고, 특히 용매 원료 비가 250인 조건에서 카페인 추출률 91.0%와 트리- 고넬린 및 클로로겐산 보존율이 각각 99.9% 및 85.9%로 최적의 결과를 보였다. This study investigated the optimal conditions for efficiently removing caffeine from green coffee beans using supercritical fluid extraction while preserving the key flavor compounds, trigonelline and chlorogenic acid. The results of the experiments conducted under various pretreatment and supercritical fluid extraction conditions revealed that the highest caffeine extraction rate was 90.6% and it was achieved when green coffee beans with a moisture content of 35% were soaked in hot water. However, this condition also showed a tendency to slightly reduce the retention rates of trigonelline and chlorogenic acid. In the supercritical fluid extraction time experiments, the caffeine content decreased as the extraction time increased. Furthermore, extraction at a temperature of 60 oC and a pressure of 40 MPa was the most effective in terms of both caffeine removal and flavor compound preservation. As the amount of water added increased, the caffeine extraction rates increased, but there was also an increase in the loss of flavor compounds. With an increase in the solvent-to-material ratio, the caffeine removal rates improved. The optimal results were observed at a ratio of 250, which achieved a caffeine extraction rate of 91.0% and retention rates of trigonelline and chlorogenic acid of 99.9% and 85.9%, respectively.
수소연료전지 자동차용 고전압 배선 시스템 평가 기술 개발
임지선,이정훈,이효정,나주란 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.4
FCEV uses 250 ~ 450 V instead of using 12 V battery. High voltage vehicle can cause electric shock, fire and explosion accident. Therefore, it has potential factors that can cause hazard of safety for users. United states of America and Europe legislate regulations such as ECE R100, FMVSS 305 for regulating electrical safety during driving or after collision. The company manufacturing high voltage components must do advanced R&D about Method for improving and confirming the safety of high voltage. We develop the specific hardware components of high voltage wiring system for the power train system and power supply system of Hyundai Motors FCEV. This paper shows test method of insulative performance for securing the electrical safety of high voltage components such as power cable, connectors and buss-bar, and proposals the guide line value for human safety of FCEV according to the test result of our development components.
한국 제조기업의 디지털화와 생산직 비정규직 고용과의 관계: 기업 교육훈련의 조절효과 분석
임지선 한국노동연구원 2021 노동정책연구 Vol.21 No.3
기업의 디지털 기술도입에 따른 거래비용의 감소는 다양한 형태의 비정규직 노동에 대한 수요를 증가시키고 있다. 하지만 기업의 디지털화에 따른 업무변화 및 일하는 방식의 변화는 근로자의 직무에 맞는 기기 활용능력 및 자료 분석능력과 같은 업무특수적 지식을 요구함으로서 기업의 인적자본에 대한 투자 및 정규직 노동에 대한 수요를 증가시킬 수 있다. 본 연구는「한국제조생산성패널(2013)」자료의 601개 한국 제조기업을 대상으로 기업의 디지털 기술도입에 따른 생산직 비정규직에의 고용효과를 분석하였다. 분석결과, 한국 제조기업의 디지털화는 생산직 비정규직의 고용비중을 높이는 것으로 나타났으나, 이때 기업의 인적자본에 대한 투자는 증가된 생산직 비정규직 고용에 대한 수요를 낮추는 데 유의미한 영향을 주는 것으로 나타났다. 본 연구는 디지털화를 위한 기업의 물적자본에 대한 투자는 생산직 비정규직 고용비중을 증가시키지만, 인적자본에 대한 투자는 이를 낮추는 데 도움이 될 수 있음을 시사한다.