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531.

Teachers’ Experiences in Implementing Competency-Based Curriculum in South Korea

Lee Sangeun, Yu Ye-Lim 한국교육학회 교육학연구 29 Pages

한국교육학회 교육학연구 2021, 59권 7호 6 137-165 (29 pages)

Lee Sangeun, Yu Ye-Lim 저
...
- 5,800원
The purpose of this study was to explore teachers’ experiences in implementing the competency-based curriculum in South Korea. The following research questions were addressed: (a) What do teachers think about the changes to competency-based curriculum? (b) What kinds of learning experiences have teachers had regarding professional development? (c) What efforts have teachers made to improve their classroom teaching and assessment? (d) How do teachers perceive the learning environment in their...
532.

대학생 진로의식 척도 개발 및 타당화

이형국 한국교육학회 교육학연구 27 Pages

한국교육학회 교육학연구 2014, 52권 4호 4 83-109 (27 pages)

이형국 저
...
- 5,600원
본 연구는 최근 대학에서 폭넓게 이루어지고 있는 진로상담 및 지도의 실제적 상황을 고려하여 Krumboltz(1991) 등의 진로-인지 관련 개념을 기반으로 대학생 수준에서 요구되는 핵심적 진로의식 을 탐색, 확인함으로써 후행될 진로행동들에 대한 예측 가능한 상담의 기초자료로서의 그 활용성과 간명성을 갖춘 측정도구를 개발하고자 대학생 진로의식 척도(Career Consciousness Scale)를 개발하 고, 그 척도의 요인구조와 타당도 및 신뢰도를 검증하고자 하였다. 이를 위하여 선행연구와 기존 척도의 고찰을 통한 연역적 구인과정과...
533.

Graphitization of PAN-based carbon fibers by CO₂ laser irradiation

Liangbo Yao, Weimin Yang, Sanyang Li, Yang Sha, Jing Tan, Ying An, Haoyi Li 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2017, Vol.24 13 97-102 (6 pages)

Liangbo Yao, Weimin Yang, Sanyang Li, Yang Sha, Jing Tan, Ying An, Haoyi Li 저
...
- 3,000원
Graphite fibers are materials with a high specific modulus that have attracted much interest in the aerospace industry, but their high manufacturing cost and low yield are still problems that prevent their wide applications in practice. This paper presents a laser-based process for graphitization of carbon fiber (CF) and explores the effect of laser radiation on the microstructure of CF. The obtained Raman spectra indicate that the outer surface of CF evolves from turbostratic structures into a...
534.

Catalytic hydrogenation-assisted preparation of melt spinnable pitches from petroleum residue for making mesophase pitch based carbon fibers

Dong Hun Lee, Jisu Choi, Young Se Oh, Yoong Ahm Kim, Kap Seung Yang, Ho Jin Ryu, Yong Jung Kim 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2017, Vol.24 4 28-35 (8 pages)

Dong Hun Lee, Jisu Choi, Young Se Oh, Yoong Ahm Kim, Kap Seung Yang, Ho Jin Ryu, Yong Jung Kim 저
...
- 3,000원
We demonstrated an effective way of preparing melt spinnable mesophase pitches via catalytic hydrogenation of petroleum residue (fluidized catalytic cracking-decant oil) and their subsequent thermal soaking. The mesophase pitches thus obtained were analyzed in terms of their viscosity, elemental composition, solubility, molecular weight, softening point and optical texture. We found that zeolite-induced catalytic hydrogenation under high hydrogen pressure contributed to a large variation in the...
535.

Applications of carbon-based materials in solid phase micro-extraction: a review

Jian Guo, Soo-Jin Park, Long-Yue Meng, Xinghua Jin 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2017, Vol.24 2 10-17 (8 pages)

Jian Guo, Soo-Jin Park, Long-Yue Meng, Xinghua Jin 저
...
- 3,000원
With continuous development in the field of sample preparation technology, solid phase micro-extraction (SPME) has been widely used in analytical chemistry for high extraction efficiency and convenient operation. Different materials lead to different extraction results. Among existing materials, carbon-based materials are still attracting attention from scientists due to their excellent physical and chemical properties as well as their modifiable surfaces, which could enhance the adsorption...
536.

Mechanical and electrical properties of epoxy resin/epoxidized castor oil/carbon fiber cloth composites

Fan-Long Jin, Heng Zhang, Shan-Shan Yao, Soo-Jin Park 한국탄소학회 Carbon Letters 5 Pages

한국탄소학회 Carbon Letters 2017, Vol.22 12 105-109 (5 pages)

Fan-Long Jin, Heng Zhang, Shan-Shan Yao, Soo-Jin Park 저
...
- 1,500원
properties and are among the materials most frequently used in the preparation of a large variety of composites [1-5]. CF-reinforced polymer composites have been widely used in many advanced technological fields, such as aerospace, engineering, sporting goods, automobiles, and marine industry during the past few decades due to their excellent properties, including high strength-to-weight ratios, light weight, high thermal and electrical conductivity, and relative ease of processing [6-10].
537.

Biocomposite membranes based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and multiwall carbon nanotubes for gas separation

Mongyoung Huh, Hye Min Lee, Young Soo Park, Seok Il Yun 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2017, Vol.21 17 116-121 (6 pages)

Mongyoung Huh, Hye Min Lee, Young Soo Park, Seok Il Yun 저
...
- 3,000원
The development of gas separation membranes is currently an active research area because of the rapidly increasing interest in carbon dioxide capture and hydrogen recovery, which are two of the most important solutions for problems related to energy and the environment [1-4]. Polymer membranes show selectivity in the separation of gases due to differences in the permeability of individual gases through the polymer film [3,4]. Even though advantageous in terms of low cost, the segmental...
538.

Removal of chromium from tannery wastewater by electrosorption on carbon prepared from peach stones: effect of applied potential

Mounir Ziati, Fariza Khemmari, Mohamed Kecir, Sabir Hazourli 한국탄소학회 Carbon Letters 5 Pages

한국탄소학회 Carbon Letters 2017, Vol.21 10 81-85 (5 pages)

Mounir Ziati, Fariza Khemmari, Mohamed Kecir, Sabir Hazourli 저
...
- 1,500원
The objective of this study is the removal of chromium from tannery wastewater by electrosorption on carbon prepared from lignocellulosic natural residue "peach stones' thermally treated. The followed steps for obtaining coal in chronological order were: cleaning, drying, crushing and finally its carbonization at 900°C. The characterization of the carbon material resulted in properties comparable to those of many coals industrially manufactured. The study of the dynamic adsorption of chromium...
539.

Adsorption capability of activated carbon synthesized from coconut shell

Md Shariful Islam, Bee Chin Ang, Samira Gharehkhani, Amalina Binti, Muhammad Afifi 한국탄소학회 Carbon Letters 9 Pages

한국탄소학회 Carbon Letters 2016, Vol.20 1 1-9 (9 pages)

Md Shariful Islam, Bee Chin Ang, Samira Gharehkhani, Amalina Binti, Muhammad Afifi 저
...
- 3,000원
Activated carbon was synthesized from coconut shells. The Brunauer, Emmett and Teller surface area of the synthesized activated carbon was found to be 1640 m2/g with a pore volume of 1.032 cm3/g. The average pore diameter of the activated carbon was found to be 2.52 nm. By applying the size-strain plot method to the X-ray diffraction data, the crystallite size and the crystal strain was determined to be 42.46 nm and 0.000489897, respectively, which indicate a perfect crystallite structure. The...
540.

The effect of the spinning conditions on the structure of mesophase pitch-based carbon fibers by Taguchi method

Zhao Jiang, Ting Ouyang, Xiangdong Yao, Youqing Fei 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2016, Vol.19 11 89-98 (10 pages)

Zhao Jiang, Ting Ouyang, Xiangdong Yao, Youqing Fei 저
...
- 3,000원
Taguchi’s experimental design was employed in the melt spinning of molten mesophase pitch to produce carbon fibers. The textures of the obtained carbon fibers were radial with varied crack angles, as observed by scanning electron microscopy and polarized optical imaging. The diameter, crack angle, preferred orientation, and tensile modulus of the produced samples were examined to investigate the influence of four spinning variables. The relative importance of the variables has been emphasized...

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