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기획취재 - 연료전지(Fuel Cell), 차세대 신재생에너지로 각광받다!
김기영,Kim, Gi-Yeong 한국전기기술인협회 2014 電力技術人 Vol.382 No.-
우리나라의 화석연료 의존율은 80%를 넘는 수준이다. 화석연료의 고갈은 전 세계적으로 큰 혼란을 불러올 것으로 예상되기 때문에 세계 각국은 신재생에너지 시장 개척에 사활을 걸고 있다. 이러한 신재생에너지 가운데 안정적인 차세대 에너지원으로 각광받고 있는 연료전지에 대해 알아보자.
김기영,Kim, Gi-Yeong 한국전기기술인협회 2014 電力技術人 Vol.382 No.-
테스토코리아는 다양한 휴대용 산업용 계측기로 세계적 영성을 얻고 있는 독일 Testo의 한국 자회사이다. 다양한 작업환경에 맞는 편리하고 정확한 첨단 장비 제작과 선진 기술력을 제공하고 앞선 기술과 서비스로 고객만족을 실현하는 등 혁신적으로 우리 산업 환경에 맞는 제품군을 갖추는 하나의 기업으로 비상 중이다.
김기영,오해연,Kim, Giyeong,Oh, Haeyeon 한국비블리아학회 2014 한국비블리아학회지 Vol.25 No.3
This study aims to investigate the perception of public library users, who are local residences, on the multi-cultural services in public libraries using a series of statistical analyses on a questionnaire survey. The objectives of multi-cultural policies by Korean government are to foster assimilation of the multi-cultural people, social unification of Korean (local) communities, and cultural diversity in the communities. The results from the analyses show that the multi-cultural services in public libraries are understood from the unification and assimilation point of views, and that the perception of the multi-cultural services in public libraries is affected by the libraries' marketing activities, such as advertisements and participation. For the sustainable provision of the services, we suggest that the libraries would better consider 1) multi-oriented services with cultural diversity, assimilation, and social unification, 2) relationship with other multi-cultural agencies in a community, and 3) the perception of local residences on the services in public libraries. 본 연구에서는 공공도서관 다문화서비스에 대한 공공도서관 이용자의 인식을 조사하기 위해 설문조사를 통한 통계분석을 실시하였다. 정부의 다문화정책은 부처에 따라 크게 동화/적응, 사회통합, 그리고 문화다양성을 지향하고 있는 것으로 나타났다. 설문조사 결과 공공도서관의 다문화서비스를 바라보는 인식은 크게 사회통합과 동화의 관점에서 이해되고 있으며, 공공도서관의 다문화서비스에 대한 홍보 및 참여와 같은 마케팅활동이 다문화서비스의 인식 및 필요성에 영향을 미치는 것으로 나타났다. 이러한 분석을 기반으로 지속적인 공공도서관의 다문화서비스 제공을 위하여 1) 다양한 다문화정책 지향점, 2) 지역의 다문화 관련기관과의 관계, 그리고 3) 지역주민의 공공도서관 다문화서비스에 대한 인식 등을 고려할 필요성을 논의하였다.
마찰용접을 적용한 Cu-Al Busbar의 전기적 물성 연구
김기영,최인철,오명훈,Kim, Ki-Young,Choi, In-Chul,ITO, Kazuhiro,Oh, Myung-Hoon 한국열처리공학회 2020 熱處理工學會誌 Vol.33 No.6
Since the dissimilar bonded interface usually consists of intermetallic compounds (IMCs) layer and cracks, their mechanical and electrical properties can be influenced by microstructure at interface between two different metals. In this study, the friction welded Cu-Al busbar, which is widely used to connect a secondary battery and their component, is selected to analyze the influence of interfacial characteristic on their tensile strength and electric conductivity. Then, the electrical characteristics of Cu busbar and Cu-Al busbar were investigated by thermal flow analysis and temperature rise test. In addition, the relationship between the maximum saturation temperature and the electrical conductivity were discussed in terms of interfacial characteristics of the friction welded Cu-Al busbar.
가토에서 하악골 신연 양에 따른 하치조신경의 조직학적 변화
김기영,유선열,Kim, Ki-Young,Ryu, Sun-Youl 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.3
The purpose of this study was to evaluate the histologic change of the inferior alveolar nerve according to distraction amount following mandibular lengthening. Seven rabbits weighing about 2 kg were used. Corticotomy was performed on the mandibular body anterior to the right first premolar region and unilateral external fixation device was placed. Every effort was made to preserve the inferior alveolar nerve during the corticotomy. The rabbits were then allowed to heal for 7 days without distraction of the device. The mandible was lengthened 0.36 mm/day, 0.76 mm/day, or 1.0 mm/day. Corticotomy and lengthening of mandible were not performed in control group. After the completion of the lengthening process, a 14-day-consolidation period was allowed. After consolidation, rabbits were sacrificed, and histologic examination of the inferior alveolar nerve was performed. The results obtained were as follows : 1. In the control group, normal trifascicular pattern of inferior alveolar nerve was observed. Epineurium, perineurium, endoneurium, and axon with myelin sheath were observed in normal appearance. 2. In 0.36 mm/day distraction group, the trifascicular pattern was normally shown, and there was no destruction in epineurium, perineurium, and endoneurium. The mild changes including myelin attenuation, axoplasmic swelling and darkening were observed. 3. In 0.72 mm/day distraction group, it was possible to differentiate the epineurium from the perineurium. Two normal fascicles and one injuried fascicle were observed with a partially destructed perineurium. Most of the axons had axoplasmic swelling and darkening. 4. In 1 mm/day distraction group, it was difficult to differentiate the nerve structures such as fascicles, epineurium, perineurium, and endoneurium. The axons were severely destroyed, except few which showed decreases in size and changes in shape. Some collagen matrices were observed around the axons. These results suggest that the higher the distraction amount, the more severe the injury to the inferior alveolar nerve, fascicles, axons. Although distraction osteogenesis may be useful, the amount of distraction should be carefully selected.