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PEM 연료전지의 단순화된 공기극 채널 내 단일 물방울의 성장 및 이동 특성에 대한 실험적 연구
김보경(Kim, Bok-Yung),김한상(Kim, Han-Sang),민경덕(Min, Young-Doug) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
To investigate the characteristics of water droplet on the gas diffusion layer from both upper-view and side-view of flow channel, a rig test apparatus was designed and fabricated with L-shape acryl plate in a 1mm{times}1mm micro-channel. This experimental device is used to simulate the single droplet growth and its transport process under fuel cell operating condition. As a first step, we investigated the growth and transport of single water droplet with working temperature and air flow velocity. The contact angle and its hysteresis of water droplet at departing moment are measured and analyzed. It is expected that this study can provide the basic understanding of liquid water droplet behavior in gas flow channel and GDL interface during the PEM fuel cell operation.
질적 연구를 통한 삶의 맥락적 관점에서의 노인의 도시락 및 밑반찬 배달 서비스에 대한 수용 태도 및 적응에 대한 이해
황지윤(Ji Yun Hwang),김보경(Bok Young Kim),김기랑(Ki Rang Kim) 대한지역사회영양학회 2014 대한지역사회영양학회지 Vol.19 No.5
The purpose of this study was to suggest the strategies for improvement ofhome-delivered meal services for the elderly, to identify reasons for recipients to getstarted with the services and to evaluate the attitude, acceptability and adaptation ofrecipients to the services from the perspective of life context. Methods: The data was collected through face-to-face in-depth interviews with eighteenlow-income elderly recipients of home-delivered meals and analyzed using a qualitativeresearch method. Results: The results were deduced as four themes which comprised of long-termvulnerable socioeconomic contexts resulted in entry to the services, conflicting acceptabilityto the services, passive adaptation to taking the services, and positive practices to copewith supplement free meals or other services. The service participation was initiatedbecause of a combination of prolonged, vulnerable socioeconomic contexts, includingpoverty and unexpected life events such as diseases, disability, living alone, aging andunemployment. With regard to taking the services, conflicting acceptability wasobserved: positive aspects including saving living cost and good quality of meals, andnegative aspects including lack of a tailored service and feeling of stigma. Although therecipients needed an individualized service, they did not express their needs anddemands for the services and they accepted the unavailability as an accustomed,prolonged vulnerable socioeconomic context. With regard to lack of tailored services,either self-solution such as modification of eating patterns or community-based networkand services were used. Conclusions: We suggest that a system to concretely identify recipients’ attitude,acceptability and adaptation for home-delivered meal services should be developed inthe establishment of a tailored nutrition support system for the low-income elderly.
남일 돌연변이 후대계통 Namil(EMS)-bl10,bph1의 도열병 및 벼멸구 저항성에 대한 유전분석
조성우(Seong-Woo Cho),정지웅(Ji-Ung Jeung),신영섭(Young-Seop Shin),강경호(Kyung-Ho Kang),이상복(Sang-Bok Lee),김보경(Bo-Kyeong Kim) 한국육종학회 2014 한국육종학회지 Vol.46 No.3
Rice is a source of food supply as the staple food. The narrow genetic diversity of Korean Japonica cultivars is prone to be susceptible to abiotic and biotic stresses such as rice blast, bacterial blight, and brown planthopper (BPH). The best approach for prevention of the breeding and extermination of disease and insect pest would be the development of rice cultivars harboring multiple disease and insect pest resistance genes. National Institute of Crop Science (NICS) in Korea developed a mutant line, Namil(EMS)-bl10,bph1, by using ethyl-methane-sulfonate (EMS) as the chemical mutagen on the wild type, Namil. The mutant line exhibits strong resistance levels against rice blast and brown planthopper. To localize favorable mutated allele types, two mapping populations were constructed by using F2 progenies derives crosses between Namil(EMS)-bl10,bph1 andMilyang23 and Namil (wild type) and Milyang23. Each F2 progenies were evaluated in terms of DNA marker genotype as well as agronomic traits measured, and for rice blast and BPH resistance, virulent blast isolate 94-254 and Korean biotype of BPH were used to screen F2:3 seedlings to conduct association analysis between marker genotype and evaluated phenotype of progeny lines. Through comparisons on major loci between two mapping populations, the putative major loci for rice blast resistance (RM1337, R2=54.4%) and BPH (RM0277, R2=55.1%) were primarily localized on chromosome 12.
이연리,김보경,최원호,김태경,이창권,배영민,조성일 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.14 No.-
Smooth muscle contraction is regulated by intracellular Ca^(2+) ([Ca^(2+)]_(i)) and the phosphorylation of myosin light chain (MLC). However, various kinds of vasoconstrictors induce a further contraction at a given [Ca^(2+)]_(i), and elicit a sustained contraction under Ca^(2+) -depleted conditions, referred to as "Ca^(2+) -sensitization", in intact and membrane-pen-neabilized smooth muscle. Previously, several molecules, including protein kinase C (PKC), RhoA, and mitogen-activated protein kinases (MAPK), have been suggested as candidate regulators of Ca^(2+) -sensitization. In the present review, we describe the role of PKC, RhoA, and MAPK in the regulation of Ca^(2+) -sensitization, and suggest a new model in research for the regulation of smooth muscle contraction.