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1081.

대학 특성이 대학생의 능동적, 협동적 학습참여 및 교수-학생 상호작용의 성장에 미치는 영향 : 대학 간(Between-Institution) 효과 분석

배상훈, 홍지인 한국교육학회 교육학연구 34 Pages

한국교육학회 교육학연구 2015, 53권 4호 7 159-192 (34 pages)

배상훈, 홍지인 저
...
- 6,300원
본 연구는 대학생의 능동적, 협동적 학습참여 및 교수와의 상호작용에 영향을 미치는 대학의 특성 을 탐색하였다. 연구 대상은 전국 29개 대학에 재학 중인 11,483명의 학생이며, 2011년부터 2013년까 지 수행된 ‘학부교육 실태조사(K-NSSE)’를 통해 수집된 자료를 분석하였다. 2011년 1학년이었던 학 생 코호트에 대하여 3년 동안 학년이 올라감에 따라 변화된 종속변인의 성장 궤적을 분석하였다. 3 수준 다층 성장모형을 적용하였으며, 제1수준에는 학생특성(성별, 고교내신 성적, 가계소득)을, 제2수 준에는 시간(연도)을,...
1082.

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
본 연구에서는 한국교육개발원의 한국교육종단조사 7~8차년도 데이터를 사용하여 대학생의 교수 및 동료학생과의 상호작용 유형 및 변화를 살펴보고 상호작용 유형에 따른 자기결정성 동기의 차이에 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...
1083.

The impact fracture behaviors of CFRP/EVA composites by drop-weight impact test

Sun-Ho Go, Hong-Gun Kim, Hee-Jae Shin, Min-Sang Lee, Hyun-Gyung Yoon, Lee-Ku Kwac 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2017, Vol.21 4 23-32 (10 pages)

Sun-Ho Go, Hong-Gun Kim, Hee-Jae Shin, Min-Sang Lee, Hyun-Gyung Yoon, Lee-Ku Kwac 저
...
- 3,000원
A drop weight impact test was conducted in this study to analyze the mechanical and thermal properties caused by the changes in the ratio of carbon fiber reinforced plastic (CFRP) to ethylene vinyl acetate (EVA) laminations. The ratios of CFRP to EVA were changed from 10:0 (pure CFRP) to 9:1, 8:2, 6:4, and 5:5 by manufacturing five different types of samples, and at the same time, the mechanical/thermal properties were analyzed with thermo-graphic images. As the ratio of the CFRP lamination was...
1084.

Improving dispersion of multi-walled carbon nanotubes and graphene using a common non-covalent modifier

Youbin Kwon, Wonbo Shim, Seung-Yeol Jeon, Ji-Ho Youk, Woong-Ryeol Yu 한국탄소학회 Carbon Letters 9 Pages

한국탄소학회 Carbon Letters 2016, Vol.20 8 53-61 (9 pages)

Youbin Kwon, Wonbo Shim, Seung-Yeol Jeon, Ji-Ho Youk, Woong-Ryeol Yu 저
...
- 3,000원
The reportedly synergistic effects of carbon nanotubes (CNTs) and graphene hybrids have prompted strong demand for an efficient modifier to enhance their dispersion. Here, we investigated the ability of poly(acrylonitrile) (PAN) to overcome the van der Waals interaction of multi-walled CNTs (MWCNTs) and graphene by employing a simple wrapping process involving ultrasonication and subsequent centrifugation of PAN/MWCNT/graphene solutions. The physical wrapping of MWCNTs and graphene with PAN was...
1085.

Effect of fiber-matrix adhesion on the fracture behavior of a carbon fiber reinforced thermoplastic-modified epoxy matrix

H.J. Carrillo-Escalante, A. ?lvarez-Castillo, A. Valadez-Gonz?lez, P. J. Herrera-Franco 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2016, Vol.19 6 47-56 (10 pages)

H.J. Carrillo-Escalante, A. ?lvarez-Castillo, A. Valadez-Gonz?lez, P. J. Herrera-Franco 저
...
- 3,000원
In this study, the fracture behavior of a thermoplastic-modified epoxy resin reinforced with continuous carbon fibers for two levels of fiber-matrix adhesion was performed. A carbon fiber with commercial sizing was used and also treated with a known silane, (3-glycidoxy propyl trimethoxysilane) coupling agent. Toughness was determined using the double cantilever test, together with surface analysis after failure using scanning electron microscope. The presence of polysulfone particles improved...
1086.

Cu nanoparticle-embedded carbon foams with improved compressive strength and thermal conductivity

Ji-Hyun Kim, Kyung Hoon Kim, Mi-Seon Park, Tae-Sung Bae, Young-Seak Lee 한국탄소학회 Carbon Letters 5 Pages

한국탄소학회 Carbon Letters 2016, Vol.17 No.1 9 65-69 (5 pages)

Ji-Hyun Kim, Kyung Hoon Kim, Mi-Seon Park, Tae-Sung Bae, Young-Seak Lee 저
...
- 1,500원
1087.

Non-blinking dendritic crystals from C-dot solution

Ashmi Mewada, Ritesh Vishwakarma, Bhushan Patil, Chinmay Phadke 한국탄소학회 Carbon Letters 4 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.3 8 211-214 (4 pages)

Ashmi Mewada, Ritesh Vishwakarma, Bhushan Patil, Chinmay Phadke 저
...
- 1,500원
Bio-imaging and drug carriers for delivery have created a huge demand for crystals. Crystals are fascinating materials that have been grown for a long time but obtaining biocompatible fluorescent crystals is a challenging task. We report on the growth of fluorescent crystals using a carbon dot (C-dot) solution by a hydrothermal process. The crystallization pattern of these C-dots exhibited a unique dendritic structure having a feather-like morphology. The growth temperature and pressure were...
1088.

Conducting and interface characterization of carbonate-type organic electrolytes containing EMImBF4 as an additive against activated carbon electrode

Mingyeong Kim, Kyungmin Kim and Seok Kim 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.1 8 51-56 (6 pages)

Mingyeong Kim, Kyungmin Kim and Seok Kim 저
...
- 3,000원
Carbonate-type organic electrolytes were prepared using propylene carbonate (PC) and dimethyl carbonate (DMC) as a solvent, quaternary ammonium salts, and by adding different contents of 1-ethyl-3-methyl imidazolium tetrafluoroborate (EMImBF4). Cyclic voltammetry and linear sweep voltammetry were performed to analyze conducting behaviors. The surface characterizations were analyzed by scanning electron microscopy method and X-ray photoelectron spectroscopy. From the experimental results,...
1089.

Overlook of current chemical vapor deposition-grown large single-crystal graphene domains

Kyung Tae Park, Taehoon Kim, Chong Rae Park 한국탄소학회 Carbon Letters 11 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.3 1 151-161 (11 pages)

Kyung Tae Park, Taehoon Kim, Chong Rae Park 저
...
- 4,000원
Exceptional progress has been made with chemical vapor deposition (CVD) of graphene in the past few years. Not only has good monolayer growth of graphene been achieved, but large-area synthesis of graphene sheets has been successful too. However, the polycrystalline nature of CVD graphene is hampering further progress as graphene property degrades due to presence of grain boundaries. This review will cover factors that affect nucleation of graphene and how other scientists sought to obtain large...
1090.

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...

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