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전체 선택해제
총 97건 검색
본문검색 결과만 보기
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Effect of acid catalysts on carbonization temperatures for ordered mesoporous carbon materials
Jeong Kuk Shon, Xing Jin, Yun Seok Choi, Jong Gu Won, Yoon Kyung Hwang, Dae Jong You, Chengbin Li, Ji Man Kim 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 10 66-71 (6 pages)
on a conventional thermal process at high temperature (typically above 900°C), are time- and energy-consuming processes. In order to oligomerize or polymerize the carbon precursors before the carbonization, an aging process should also be carried out in the presence of acid catalysts in low temperature ranges of 100°C?200°C. In the case of sucrose as a carbon source, sulfuric acid (H2SO4) is typically used as an acid catalyst for the dehydration and subsequent oligomerization of the carbon... -
NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group
Mi-Seon Park, Sangmin Lee, Min-Jung Jung, Hyeong Gi Kim, Young-Seak Lee 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 3 19-25 (7 pages)
Activated carbon fiber (ACF) surfaces are modified using an electron beam under different aqueous solutions to improve the NO gas sensitivity of a gas sensor based on ACFs. The oxygen functional group on the ACF surface is changed, resulting in an increase of the number of non-carbonyl (-C-O-C-) groups from 32.5% for pristine ACFs to 39.53% and 41.75% for ACFs treated with hydrogen peroxide and potassium hydroxide solutions, respectively. We discover that the NO gas sensitivity of the gas sensor... -
Bulk graphite: materials and manufacturing process
Sang-Min Lee, Dong-Su Kang and Jea-Seung Roh 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.3 1 135-146 (12 pages)
Graphite can be classified into natural graphite from mines and artificial graphite. Due to its outstanding properties such as light weight, thermal resistance, electrical conductivity, thermal conductivity, chemical stability, and high-temperature strength, artificial graphite is used across various industries in powder form and bulk form. Artificial graphite of powder form is usually used as anode materials for secondary cells, while artificial graphite of bulk form is used in steelmaking... -
Facile preparation of self-assembled wool-based graphene hydrogels by electron beam irradiation
Mira Park, Bishweshwar Pant, Jawun Choi, Yong Wan Park, Chohye Lee, Hye Kyoung Shin, Soo-Jin Park4, Hak-Yong Kim 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.2 11 136-141 (6 pages)
Three dimensional self-assembled graphene hydrogels were easily fabricated by electron beam irradiation (EBI) using an aqueous solution of wool/poly(vinyl alcohol) and graphene oxide (GO). After exposure to various levels of EBI radiation, the highly porous, self-assembled, wool-based graphene hydrogels were characterized using scanning electron microscopy and Fourier-transform infrared spectroscopy; to determine the gel fraction, degree of swelling, gel strength, kinetics-of-swelling analyses... -
수행성과분석 : 역량모델링에의 적용
이진구, 정재삼 한국기업교육학회 기업교육과 인재연구 19 Pages
한국기업교육학회 기업교육과 인재연구 2008, 제 10권 제 2호 5 99-117 (19 pages)
이 논문은 한국의 X기업의 수행성과분석(performance analysis)에 대한 경험적인 사례를 논의하고 이를 역량모형 개발에 적용하는데 초점을 둔다. 수행성과분석의 목적은 긍정적인 수행결과 즉 성과를 달성하는데 적절한 인터벤션을 선정하고, 실행하며, 평가하기 위하여 문제/기회를 제대로 파악하는데 있다. 역량(competency)이 활동, 과제, 환경과 도구와 같은 직무범주의 핵심요건이기 때문에, 이 역량은 수행성과 향상을 위한 주요 연구의제로 제시된다. 비록 역량모델링이 시간소모적인 비용이 많이 드는 일일지라도, 역량모형은... -
The Discursive Construction of Writer Identity in the Statement of Purpose (SOP): A Case Study of Two Korean Students
Park Laura Eunae 이화여자대학교 교과교육연구소 교과교육학연구 14 Pages
이화여자대학교 교과교육연구소 교과교육학연구 2017, 제 21권 2호 7 142-155 (14 pages)
This study explores the notion of writer identity in the construction of the Statement of Purpose (SOP). A total of five SOPs written by two Korean graduate students were analyzed by the researcher; in addition, the SOPs were reviewed by two native speaker TESOL professors who provided open-ended comments afterwards. Findings of the study indicate that the writers' identities were multiple and contradicting throughout the texts. Furthermore, while the native speaker professors felt that the...
