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141.

Preparation and thermal properties of polyethylene-based carbonized fibers

Kwan-Woo Kim, Hye-min Lee, Byoung Suhk Kim, Seon-Hwan Hwang, Lee-Ku Kwac, Kay-Hyeok An and Byung-Joo Kim 한국탄소학회 Carbon Letters 5 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.1 10 62-66 (5 pages)

Kwan-Woo Kim, Hye-min Lee, Byoung Suhk Kim, Seon-Hwan Hwang, Lee-Ku Kwac, Kay-Hyeok An and Byung-Joo Kim 저
...
- 1,500원
In this study, carbonized fibers were prepared by using acidically cross-linked LDPE fibers. The surface morphologies of the carbonized fibers were observed by SEM. The effects of cross-linking process temperatures were studied using thermal analyses such as DSC and TGA. The melting and heating enthalpy of the fibers decreased as the cross-linking temperature increased. The cross-linked fibers had a carbonization yield of over 50%. From SEM results the highest yield of carbonized LDPE-based...
142.

An overview of new oxidation methods for polyacrylonitrile?based carbon fibers

Hye Kyoung Shin, Mira Park, Hak-Yong Kim and Soo-Jin Park 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.1 2 11-18 (8 pages)

Hye Kyoung Shin, Mira Park, Hak-Yong Kim and Soo-Jin Park 저
...
- 3,000원
The process of oxidizing polyacrylonitrile (PAN)-based carbon fibers converts them into an infusible and non-flammable state prior to carbonization. This represents one of the most important stages in determining the mechanical properties of the final carbon fibers, but the most commonly used methods, such as thermal treatment (200°C to 300°C), tend to waste a great deal of process time, money, and energy. There is therefore a need to develop more advanced oxidation methods for PAN precursor...
143.

Modification of isotropic coal-tar pitch by acid treatments for carbon fiber melt-spinning

Mi Jung Yoo, Hyo Jun Ko, Yun-Soo Lim and Myung-Soo Kim 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.4 3 247-254 (8 pages)

Mi Jung Yoo, Hyo Jun Ko, Yun-Soo Lim and Myung-Soo Kim 저
...
- 3,000원
In this work, thermal treatment accompanied with different acid treatments was applied to a commercial coal tar pitch (CTP) to obtain a spinnable precursor pitch for carbon fiber. In the case of thermal treatment only, a relatively high reaction temperature of between 380°C and 400°C was required to obtain a softening point (SP) range of 220°C-260°C and many meso-phase particles were created during the application of high reaction temperature. When nitric acid or sulfuric acid treatment was...
144.

Effects of carbonization temperature on pore development in polyacrylonitrile-based activated carbon nanofibers

Hye-Min Lee, Kay-Hyeok An, Byung-Joo Kim 한국탄소학회 Carbon Letters 5 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.2 13 146-150 (5 pages)

Hye-Min Lee, Kay-Hyeok An, Byung-Joo Kim 저
...
- 1,500원
In this work, activated carbon nanofiber (ACNF) electrodes with high double-layer capacitance and good rate capability were prepared from polyacrylonitrile nanofibers by optimizing the carbonization temperature prior to H2O activation. The morphology of the ACNFs was observed by scanning electron microscopy. The elemental composition was determined by analysis of X-ray photoelectron spectroscopy. N2-adsorption-isotherm characteristics at 77 K were confirmed by Brunauer-Emmett-Teller and...
145.

Superhydrophobic carbon-based materials: a review of synthesis, structure, and applications

Long-Yue Meng, Soo-Jin Park 한국탄소학회 Carbon Letters 16 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.2 5 89-104 (16 pages)

Long-Yue Meng, Soo-Jin Park 저
...
- 4,500원
Materials with appropriate surface roughness and low surface energy can form superhydrophobic surfaces, displaying water contact angles greater than 150°. Superhydrophobic carbon-based materials are particularly interesting due to their exceptional physicochemical properties. This review discusses the various techniques used to produce superhydrophobic carbon-based materials such as carbon fibers, carbon nanotubes, graphene, amorphous carbons, etc. Recent advances in emerging fields such as...
146.

Effects of pore structures on electrochemical behaviors of polyacrylonitrile-based activated carbon nanofibers by carbon dioxide activation

Hye-Min Lee, Hong-Gun Kim, Kay-Hyeok An, Byung-Joo Kim 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.1 10 71-76 (6 pages)

Hye-Min Lee, Hong-Gun Kim, Kay-Hyeok An, Byung-Joo Kim 저
...
- 3,000원
and Dubinin-Radushkevich equations. As experimental results, many holes or cavernous structures were found on the fiber surfaces after the CO2 activation as confirmed by scanning electron microscopy analysis. Specific surface areas and pore volumes of the prepared ACNFs were enhanced within a range of 10 to 30 min of activation times. Performance of the porous PAN-based nanofibers as an electrode for electrical double layer capacitors was evaluated in terms of the activation conditions.
147.

Synthesis and characterization of polybenzoxazole/graphene oxide composites via in situ polymerization

Jun Lim, Min-Cheol Kim, Munju Goh, Hyeounk Yeo, Dong Geun Shin, Bon-Cheol Ku, Nam-Ho You 한국탄소학회 Carbon Letters 4 Pages

한국탄소학회 Carbon Letters 2013, Vol.14 No.4 9 251-254 (4 pages)

Jun Lim, Min-Cheol Kim, Munju Goh, Hyeounk Yeo, Dong Geun Shin, Bon-Cheol Ku, Nam-Ho You 저
...
- 1,500원
148.

Comparative studies of porous carbon nanofibers by various activation methods

Hye-Min Lee, Hyo-Rang Kang, Kay-Hyeok An, Hong-Gun Kim, Byung-Joo Kim 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2013, Vol.14 No.3 7 180-185 (6 pages)

Hye-Min Lee, Hyo-Rang Kang, Kay-Hyeok An, Hong-Gun Kim, Byung-Joo Kim 저
- 3,000원
149.

방과후학교 강사의 무형식 학습 활동과 학습 전이의 관계에 대한 사회적 네트워크 접근성의 조절 효과

배을규, 최영선, 최지영, 김대영 한국성인교육학회 Andragogy Today 24 Pages

한국성인교육학회 Andragogy Today 2014, Vol.17 No.3 1 1-24 (24 pages)

배을규, 최영선, 최지영, 김대영 저
...
- 5,300원
이 연구는 방과후학교 강사의 무형식 학습 활동과 학습 전이의 관계에 대한 사회적 네 트워크 접근성의 조절 효과를 살펴봄으로써 무형식 학습 활동, 학습 전이, 사회적 네트워크 접근성의 관계에 대한 이론적 논의를 제공하고, 방과후학교 강사의 전문성 향상을 위한 실 천적 시사점을 제시하고자 하였다. 이를 위해 Choi(2009)의 무형식 학습 활동, Hatala(2009) 의 사회적 네트워크 접근성, 이도형(1995)의 학습 전이 측정 도구를 활용하여 인천 지역 방 과후학교 강사 912명을 대상으로 설문 조사를 실시하였다. 총 546부가...
150.

인력자원개발(Human Resources Development: HRD)인가, 인력자원관리(Human Resources Management: HRM)인가?

이기성 한국성인교육학회 Andragogy Today 24 Pages

한국성인교육학회 Andragogy Today 2004, Vol.7 No.3 6 155-178 (24 pages)

이기성 저
...
- 5,300원
인력자원개발에 관한 관심이 높아지는 상황에서 정부의 조직개편에 따라 교육인적자원 부가 새로이 출범하면서 인력자원개발이라는 용어가 광범위하게 사용되게 되었다. 그 러나, 정부가 채택한 용어가 정부문서에서 사용되는 것에 그치지 않고 학계에서 사용 하는 용어에까지 영향을 미치게 되었다. 이러한 상황에서 본 논문은 용어의 적절성에 관한 논의 과정도 거치지 않고 널리 사용되는 것이 바람직한가 하는 의문에서 출발하 여 학문적 논의를 통하여 바람직한 용어의 선택과 그 사용에 적절한 방향을 모색하는 것을 목적으로...

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