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861.

대학생의 교수-학생 및 동료학생간의 상호작용 유형 변화에 따른 자기결정성 동기 분석

최보금, 조성희 한국교육학회 교육학연구 26 Pages

한국교육학회 교육학연구 2014, 52권 3호 2 29-54 (26 pages)

최보금, 조성희 저
...
- 5,500원
대 해 분석하였다. 7차년도와 8차년도 대학생 설문을 모두 완료한 총 2,677명이 최종 분석에 사용되었으며, 대학 내 구 성원간 상호작용 유형을 분석하기 위해 상관분석과 군집분석을, 분류된 상호작용 집단에 따라 자기결 정성 동기에 차이가 있는지를 알아보기 위해 다변량 분산분석(MANOVA)을 실시하였다. 분석결과 첫째, 7차년도 교수 및 동료학생과의 상호작용에 따른 대학생 집단은 3개의 군집으로 분류 되어 대학 1학년 학생이 주요 구성원과 동일한 상호작용을 하지 않는 것으로 나타났다. 둘째, 8차년도 동일 학생들의 교수 및...
862.

대학진학에 필요한 중·고교 학력수준과 교육환경에 관한 종단연구

이재경, 김양분, 강충서 한국교육학회 교육학연구 31 Pages

한국교육학회 교육학연구 2014, 52권 1호 2 27-57 (31 pages)

이재경, 김양분, 강충서 저
...
- 6,000원
한국교육종단연구 1차년도부터 7차년도까 지 수집된 자료를 사용하였다. 최종적으로 분석에 사용된 표본은 4,751명이다. 중·고등학교 학력기대 수준 로지스틱 회귀모형 분석 결과, 전문대학 진학에 필요한 최소 성취수준이 기초학력 수준에 가깝 고, 대학진학에 필요한 최소 성취수준이 보통학력 수준에 가까웠다. 전국적 성적 분포에서 중하위권 이상에 해당하는 학생들은 전문대학에 진학하고, 중위권 이상에 해당하는 학생들은 대학에 진학하였 다. 가정과 학교 변인 모두 대학진학 미비집단과 예비집단을 구분하는데 통계적으로...
863.

KOH-activated graphite nanofibers as CO2 adsorbents

Hui Yuan, Long-Yue Meng, Soo-Jin Park 한국탄소학회 Carbon Letters 5 Pages

한국탄소학회 Carbon Letters 2016, Vol.19 12 99-103 (5 pages)

Hui Yuan, Long-Yue Meng, Soo-Jin Park 저
...
- 1,500원
a gradual increase of CO2 adsorption capacity at CK-3 and then decreased to CK-5, as determined by CO2 adsorption isotherms. CK-3 had the narrowest micropore size distribution (0.6?0.78 nm) among the treated GNFs. Therefore, KOH activation was not only a significant method for developing a suitable pore-size distribution for gas adsorption, but also increased CO2 adsorption capacity as well. The study indicated that the sample prepared with a weight ratio of ‘3’ showed the best CO2 adsorption...
864.

Waste coffee grounds-derived nanoporous carbon nanosheets for supercapacitors

Min Hong Park, Young Soo Yun, Se Youn Cho, Na Rae Kim, Hyoung-Joon Jin 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2016, Vol.19 8 66-71 (6 pages)

Min Hong Park, Young Soo Yun, Se Youn Cho, Na Rae Kim, Hyoung-Joon Jin 저
...
- 3,000원
such as high specific surface area (1960.1 m2 g?1), numerous redox-active heteroatoms (16.1 at% oxygen, 2.7 at% nitrogen, and 1.6 at% sulfur), and high aspect ratios (>100). These unique properties led to good electrochemical performance as supercapacitor electrodes. A specific capacitance of ~438.5 F g?1 was achieved at a scan rate of 2 mV s?1, and a capacitance of 176 F g?1 was maintained at a fast scan rate of 100 mV s?1. Furthermore, cyclic stability was achieved for over 2000 cycles.
865.

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
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 fibers was obtained by cross-linking at a sulfate temperature (170oC). As a result, carbonation yield of the carbonized fibers was found to depend on the functions of the cross-linking ratio of the LDPE precursors.
866.

Properties of multi-walled carbon nanotube reinforced epoxy composites fabricated by using sonication and shear mixing

Min Ye Koo, Hon Chung Shin, Won-Seok Kim and Gyo Woo Lee 한국탄소학회 Carbon Letters 7 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.4 4 255-261 (7 pages)

Min Ye Koo, Hon Chung Shin, Won-Seok Kim and Gyo Woo Lee 저
...
- 3,000원
Multi-walled carbon nanotube reinforced epoxy composites were fabricated using shear mixing and sonication. The mechanical, viscoelastic, thermal, and electrical properties of the fabricated specimens were measured and evaluated. From the images and the results of the measurements of tensile strengths, the specimens having 0.6 wt% nanotube content showed better dispersion and higher strength than those of the other specimens. The Young’s moduli of the specimens increased as the nanotube filler...
867.

Carbon-allotropes: synthesis methods, applications and future perspectives

P. S. Karthik, A. L. Himaja and Surya Prakash Singh 한국탄소학회 Carbon Letters 19 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.4 1 219-237 (19 pages)

P. S. Karthik, A. L. Himaja and Surya Prakash Singh 저
...
- 4,800원
The element carbon has been used as a source of energy for the past few hundred years, and now in this era of technology, carbon has played a significant and very prominent role in almost all fields of science and technology. So as an honour to this marvellous element, we humans should know about its various forms of existence. In this review article, we shed light on all possible carbon-allotropes; similarities in their synthesis techniques and the starting materials; their wide range of...
868.

Microwave heating of carbon-based solid materials

Teawon Kim, Jaegeun Lee, Kun Hong Lee 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.1 2 15-24 (10 pages)

Teawon Kim, Jaegeun Lee, Kun Hong Lee 저
...
- 3,000원
As a part of the electromagnetic spectrum, microwaves heat materials fast and efficiently via direct energy transfer, while conventional heating methods rely on conduction and convection. To date, the use of microwave heating in the research of carbon-based materials has been mainly limited to liquid solutions. However, more rapid and efficient heating is possible in electron-rich solid materials, because the target materials absorb the energy of microwaves effectively and exclusively....
869.

Preparation of needle coke from petroleum by-products

Humala Paulus Halim, Ji Sun Im, Chul Wee Lee 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2013, Vol.14 No.3 3 152-161 (10 pages)

Humala Paulus Halim, Ji Sun Im, Chul Wee Lee 저
- 3,000원
870.

Synthesis and electrochemical analysis of Pt-loaded, polypyrroledecorated, graphene-composite electrodes

Jiyoung Park, Seok Kim 한국탄소학회 Carbon Letters 4 Pages

한국탄소학회 Carbon Letters 2013, Vol.14 No.2 8 117-120 (4 pages)

Jiyoung Park, Seok Kim 저
- 1,500원
using X-ray diffraction and transmission electron microscopy. The results showed successful deposition of Pt nano-particles, with crystallite size of about 2.7 nm, on the PPy-RGO support film. Catalytic activity for methanol electrooxidation in fuel cells was investigated using cyclic voltammetry. The fundamental electrochemical test results indicated that the electro-catalytic activity, for methanol oxidation, of the Pt/PPy-RGO combination was much better than for commercial catalyst.

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