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311.

A Simulation Study for Examining Roles of Sampling Weight in Multilevel Analysis with data from a Complex Survey Design

Jung Hyekyung, Park In-Yong 한국교육학회 교육학연구 21 Pages

한국교육학회 교육학연구 2021, 59권 7호 4 85-105 (21 pages)

Jung Hyekyung, Park In-Yong 저
...
- 5,000원
This study was motivated by the National Assessment of Educational Achievement (NAEA) involving a complex survey design for sampling. The goal of the study was to explore the benefit of weighted analysis in multilevel modeling. Large-scale data such as the NAEA data are often analyzed in multilevel analyses to reflect the nested data structure. A simulation study was conducted incorporating different conditions. Multilevel analysis results were compared without weights, with basic design...
312.

Multilevel Multiple-Group Latent Profile Analysis of Instructional Practices in Science: Cross-national Comparison between Korea and Japan

Son Yoonhee, Hong Yujung, Park Hyun-Jeong, Kim Junok 한국교육학회 교육학연구 30 Pages

한국교육학회 교육학연구 2021, 59권 7호 3 55-84 (30 pages)

Son Yoonhee, Hong Yujung, Park Hyun-Jeong, Kim Junok 저
...
- 5,900원
This study aims to extend the multi-group latent profile approach proposed by Morin et al. (2016) to a multilevel context and to provide an illustration with real-world data. Specifically, multilevel multiple-group latent profile analysis (MMLPA) models were fitted following seven steps to classify students according to their perception of instructional practices in science classrooms and to compare the latent profiles of two countries using Korean and Japanese data from the Programme for...
313.

자기결정성이론에 근거한 학습동기와 수업참여의 종단적 관계

임성애 한국교육학회 교육학연구 22 Pages

한국교육학회 교육학연구 2021, 59권 4호 6 163-184 (22 pages)

임성애 저
...
- 5,100원
본 연구는 자기결정성이론에 근거한 내재동기와 외재동기, 수업참여 간 종단적 상호효과를 검증하는데 목적이 있었다. 이를 위해 한국교육개발원의 한국교육종단조사 2013 자료 중 3차년도(중1, 2015년), 5차년도(중3, 2017년), 7차년도(고2, 2019년)의 데이터를 활용하였다. 연구대상은 총 6,550명이며, 자기회귀교차지연 모형을 실시하였다. 연구 결과는 다음과 같다. 첫째, 세 시점에 걸쳐 내재동기와 외재동기, 수업참여를 측정한 결과, 이전 시점의 내재동기와 외재동기, 수업참여가 각각 이후 시점의 내재동기와 외재동기,...
314.

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...
315.

Effect of the surface modification using MWCNTs with different L/D by two different methods of deposition on the IFSS of single carbon fiber-epoxy resin composite

Minerva L. Herrera-Sosa, Alex Valadez-Gonz?lez, Humberto V?zquez-Torres, Pierre G. Mani-Gonz?lez, Pedro J. Herrera-Franco 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2017, Vol.24 3 18-27 (10 pages)

Minerva L. Herrera-Sosa, Alex Valadez-Gonz?lez, Humberto V?zquez-Torres, Pierre G. Mani-Gonz?lez, Pedro J. Herrera-Franco 저
...
- 3,000원
chemical reactions. The changes in the CF surface morphology after the MWCNT deposition were analyzed using SEM, which revealed a higher density and uniform coverage for the PAMAM-treated CF and the short MWCNTs. The interfacial adhesion of the composite materials was evaluated using the single fiber fragmentation technique. The results indicated an improvement in the interfacial shear strength with the addition of the short-MWCNTs treated with acid solutions and grafted onto the surface of the...
316.

Dispersions of partially reduced graphene oxide in various organic solvents and polymers

Hye Min Kim, Seo Gyun Kim, Heon Sang Lee 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2017, Vol.23 8 55-62 (8 pages)

Hye Min Kim, Seo Gyun Kim, Heon Sang Lee 저
...
- 3,000원
We report on the dispersion state of partially reduced graphene oxide (PRGO) in organic solvents, namely methyl ethyl ketone, ethyl acetate, methylene chloride, toluene, and xylene, by controlling the carbon to oxygen (C/O) atomic ratio of the PRGOs. A two-phase solvent exchange method is also proposed to transfer PRGO from water to an aprotic solvent, such as methyl ethyl ketone. We achieve relatively good dispersion in aprotic and non-polar solvents by controlling the C/O atomic ratio of the...
317.

Extraction and characterization of lignin from black liquor and preparation of biomass-based activated carbon therefrom

Daeyeon Kim, Jinsil Cheon, Jeonghoon Kim, Daekyun Hwang, Ikpyo Hong, Oh Hyeong Kwon, Won Ho Park, Donghwan Cho 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2017, Vol.22 14 81-88 (8 pages)

Daeyeon Kim, Jinsil Cheon, Jeonghoon Kim, Daekyun Hwang, Ikpyo Hong, Oh Hyeong Kwon, Won Ho Park, Donghwan Cho 저
...
- 3,000원
In the present study, biomass-based lignin was extracted from industrial waste black liquor and the extracted lignin was characterized by means of attenuated total reflectance- Fourier transform infrared spectroscopy and 1H-nuclear magnetic resonance spectroscopy. The extracted lignin was carbonized at different temperatures and then activated with steam at 850oC. The extracted lignin in powder state was transformed into a bulky carbonized lignin due to possible fusion between the lignin...
318.

Comparative numerical evaluation for the low velocity impact behavior of T300 and T800 composite system

Jae-Seok Choi, Heung Soap Choi, Soo-Jin Park, Myung Kyun Park 한국탄소학회 Carbon Letters 7 Pages

한국탄소학회 Carbon Letters 2017, Vol.22 9 89-95 (7 pages)

Jae-Seok Choi, Heung Soap Choi, Soo-Jin Park, Myung Kyun Park 저
...
- 3,000원
Carbon fiber reinforced polymer (CFRP) composites have been used for many decades for extreme light weight design purposes in various areas, such as the aerospace industry, automobiles, sports goods and etc. because they provide the advantages of high specific strength and high rigidity [1]. In particular, the fuselage and wings of various aircraft, as well as the load bearing structures and components of mechanical and civil engineering systems are currently being manufactured with CFRP....
319.

Study of complex electrodeposited thin film with multi-layer graphene-coated metal nanoparticles

Young-Lae Cho, Jung-woo Lee, Chan Park, Young-il Song, Su-Jeong Suh 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2017, Vol.21 8 68-73 (6 pages)

Young-Lae Cho, Jung-woo Lee, Chan Park, Young-il Song, Su-Jeong Suh 저
...
- 3,000원
We have demonstrated the production of thin films containing multilayer graphene-coated copper nanoparticles (MGCNs) by a commercial electrodeposition method. The MGCNs were produced by electrical wire explosion, an easily applied technique for creating hybrid metal nanoparticles. The nanoparticles had average diameters of 10?120 nm and quasispherical morphologies. We made a complex-electrodeposited copper thin film (CETF) with a thickness of 4.8 μm by adding 300 ppm MGCNs to the electrolyte...
320.

Synthesize multi-walled carbon nanotubes via catalytic chemical vapour deposition method on Fe-Ni bimetallic catalyst supported on kaolin

Aliyu A, Abdulkareem AS, Kovo AS, Abubakre OK, Tijani JO, Kariim I 한국탄소학회 Carbon Letters 18 Pages

한국탄소학회 Carbon Letters 2017, Vol.21 5 33-50 (18 pages)

Aliyu A, Abdulkareem AS, Kovo AS, Abubakre OK, Tijani JO, Kariim I 저
...
- 4,700원
In this study, Fe-Ni bimetallic catalyst supported on kaolin is prepared by a wet impregnation method. The effects of mass of kaolin support, pre-calcination time, pre-calcination temperature and stirring speed on catalyst yields are examined. Then, the optimal supported Fe-Ni catalyst is utilised to produce multi-walled carbon nanotubes (MWCNTs) using catalytic chemical vapour deposition (CCVD) method. The catalysts and MWCNTs prepared using the optimal conditions are characterized using high...

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