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저농도의 HPC 영역에서 에멀젼법에 의해 제조된 구형 알루미나 분말의 입자 크기 변화
안치원,박건식,유한수,조건,이영우,양명승,Ahn, C.W.,Park, K.S.,Yoo, H.S.,Cho, K.,Lee, Y.W.,Yang, M.S. 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.5
Spherical alumina gel powders were produced by hydrolysis of aluminum sec-butoxide (Al(sec-OC4H9)3) in a n-octanol/acetonitrile mixed solvent. The enlargement of particle size was induced by increasing HPC (hydroypropylcellulose) concentration (0.005, 0.1, and 0.05 g/ι) and emulsion-state aging time (10 min and 360 min). Mean particle sizes of dried alumina gel powders increased from 1.4 ${\mu}{\textrm}{m}$ to 3.5${\mu}{\textrm}{m}$ at 10-min emulsion-state aging time and from 1.9${\mu}{\textrm}{m}$ to 4.1${\mu}{\textrm}{m}$ at 360-min emulsion-state aging time as HPC concentration increased from 0.005 g/ι to 0.05 g/ι. At the same HPC concentration, particle size of dried alumina gel powder increased with increasing of emulsion-state aging time from 10 min to 360 min. The increase in the average particle size of dried alumina gel powder with increase in HPC concentration was interpreted as the enlargement of particles from alkoxide emulsions unprotected by HPC. The produced dried gel powder calcined at 115$0^{\circ}C$ for one hour transformed to $\alpha$-alumina.
모세 사프디의 미술관 작품에 나타나는 건축 특성에 관한 연구
안치원(Ahn, Abraham Chiwon),김진호(Kim, Jin-Ho) 한국실내디자인학회 2017 한국실내디자인학회논문집 Vol.26 No.5
This study examines Safdie’s design philosophy: place, purpose, and process and design strategies found in museum buildings. Safdie, influenced by personal background as immigrant, education of McGil University in Canada, apprenticeship from Louis Kahn, is one of the most recognized architects who designed renowned public and cultural buildings after Habitat 67 in Montreal, Canada. In order to reveal design strategies his eight museum buildings has been selected and analyzed in terms of interpretation of context, program presented in floor plan and section design, and the process of integrity found in structure and material. The results of this paper can be summarized as follows: 1) Reflection of existing context and regeneration of the locality has been in a creative way to reinforce the sense of place. 2) The layout of major and gallery space is determined according to the Safdie’s interpretation of the site context and this can be categorized into three types. 3) Integration of the innovative structural frame and material has been experimented by using tartan grid and toroid form in the major and gallery spaces. This study is intended to reevaluate the significance of Safdie’s design approach to building uniqueness of the site, program and tectonic.
세계철도산업 효율성 추세 분석(DEA Window 사용)
안치원 ( Chee Won Ahn ),하헌구 ( Hun Koo Ha ) 한국로지스틱스학회 2014 로지스틱스연구 Vol.22 No.4
본 연구는 2006년~2011년 OECD 23개국 철도산업을 대상으로 DEA(Data Envelopment Analysis) BCC(Banker, Charnes and Cooper) 및 DEA Window 분석을 통해 세계철도산업의 효율성 추세를 분석하였다. 연구의 목적을 달성하기 위해 UIC 세계철도통계연감 및 국가별 철도회사 홈페이지를 활용하였으며 투입 및 산출요소를 선정하기 위해 기존 문헌 연구를 수행하였다. 2011년 DEA-BCC 분석결과 일본, 미국, 이스라엘 등이 효율성이 1로 가장 높게 나타났고 한국은 0.731로 비교적 효율적으로 운영되고 있는 것으로 나타났다. 2006년~2011년 6년 동안 DEA Window 분석결과 6년 전체 평균 효율성은 이스라엘, 일본, 미국 순으로 효율성이 높게 나타났으며 터키, 체코, 폴란드 순으로 효율성이 낮은 것으로 분석되었다. 한국철도의 효율성을 증대시키기 위해서는 여객 및 화물수송을 늘려야 하는 것으로 분석되었고 이를 위해서는 수송 빈도 증대, 운송시간단축, 정보제공서비스 강화 등의 철도중심 교통체계를 확립해야 한다. This study analyzed the efficiency trends of the global railways industry of the 23 OECD countries from2006 to 2011 using DEA-BCC and DEA Window. In order to achieve the objectives of the study, literature study, yearbook and national rail company web surfing for selecting input and output elements was performed. Year 2011 DEA-BCC analysis showed that the efficiency score of Israel, the United States and Japan is 1 and South Korea is operating as efficiently as0.731. The overall average efficiency result of DEA Window analysis during 2006-2011 year showed that Israel, Japan, the United States are high and Turkey, Czech Republic, Poland are low. In order to increase the efficiency of the Korea Railroad, passenger and freight transport should be increased. Also, the railway transportation system, such as increased transport frequency, shorter delivery time, enhanced information services should be established.
COVID-19 사태에 따른 중증환자 대응 모듈러 음압격리병동 계획에 관한 연구
안치원(Ahn, Chi-Won),김상헌(Kim, Sang-Heon),하혜민(Ha, Hye-Min),김나윤(Kim, Na-Yoon) 대한건축학회 2023 대한건축학회논문집 Vol.39 No.10
Due to the increase of respiratory infectious diseases such as Middle East Respiratory Syndrome (MERS) and COVID-19, the importance of facilities such as negative pressure isolation wards are increasing. However, the number of negative pressure isolation rooms and wards are in short supply worldwide. Therefore, this paper would like to use the modular method as a method of quickly installing negative pressure isolation facilities in large quantities in the event of a rapid spreading diseases. If the modular method is used for negative pressure isolation facilities, it is believed that the hospital room can be quickly installed and expanded in case of emergency disasters such as infectious diseases. In most of the previous studies, studies were conducted based on the general ward. In addition, research on negative pressure isolation wards is limited, and guidelines related to wards that can be quickly deployed in the event of an emergency disaster are still unclear. Therefore, this study aims to identify the limitations of existing previous studies and propose guidelines to effectively respond to the epidemic of infectious diseases by using modular methods that can quickly install negative pressure isolation facilities in the event of an infectious disease. The purpose of this study is to propose a plan for a modular negative pressure isolation wards that can minimize the spread of infection by proposing a optimal layout and circulation.
모듈러 기반 의료시설 공간 프로그램 및 설계 기술 개발
안치원(Abraham Chiwon Ahn) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
Medical facilities often require complicated and specific space programatic planning. Modular approach can be utilized in designing and construction of medical facilities in various scales. The goal of this research project is to develop space planning and design method for modular medical facility planning and offer guidelines in designing modular medical facilities.