• Journal of KIISE
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• v.42 no.5
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• pp.664-670
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• 2015

With the rapid progression of the Internet and smartphones, YouTube has grown significantly as a social media sharing site and has become popular all around the world. As users share videos through YouTube, social data are created and users look for video recommendations related to their interests. In this paper, we extract users' social category based on their social relationship and social category classification list using YouTube data. We propose the YouTube recommendation algorithm using the extracted users' social category for more accurate and meaningful recommendations. We show experiment results of its validation.

• 한국벤처창업학회:학술대회논문집
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• 2023.04a
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• pp.11-13
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• 2023

대기업 등을 비롯한 중소기업들은 여러 광고 매체를 이용해 자사의 상품이나 브랜드 이미지를 홍보하는 것 이외에 유튜브와 같은 온라인 동영상 서비스 플랫폼에서 제품이나 서비스를 동영상으로 제작하여 다채로운 방법으로 가공, 소개하며 마케팅 효과를 극대화하고 있다. 이는 기업의 제품 및 서비스의 동영상 마케팅이 소비자들에게 어떤 영향을 미치고 직접적인 매출과 상관관계가 있는지를 이미 파악하고 접근하고 있다는 증거이다. 상대적으로 소상공인들은 동영상의 필요성에 대한 인식이 부족한 상태이다. 이에 유튜브와 같은 온라인 동영상 서비스 플랫폼에서 효과적으로 제품 및 서비스에 대해 관심과 흥미를 불러 일으키기 위해 동영상 마케팅을 시행하고자 할 때 동영상은 어떤 요소들이 충족되어야 하는지를 연구하려고 한다. 그리고 정확하게 동영상의 어떤 요소들이 소비자들의 구매 욕구를 상승시키는지와 같은 소비자들의 구매 행동 부분에 밀접한 영향을 미치는 동영상의 요소들에 대해 연구하고자 한다. 소비자들이 느끼는 구매 의지에 영향을 미치는 동영상의 요소들을 역설적으로 소상공인들에게 영상의 필요성을 인식시키기 위함이다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.554-557
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• 2010

본 논문에서는 동일한 체적분율 가지는 탄소나노튜브 나노복합재의 기계적 특성을 규명하였다. 동일한 chirality를 가지는 서로 다른 크기의 탄소나노튜브를 이용하여 탄소나노튜브의 크기가 복합재의 물성에 미치는 영향을 규명하였다. 복합재료의 분자동역학의 결과 탄소나노튜브의 길이방향의 물성은 크게 증가하나, 전단특성의 물성 강화효과를 나타나지 않았다. 이는 통해 탄소나노튜브와 기지재료 사이의 상호작용력이 복합재료의 전단력을 전달하고, 변형을 유지할 만큼 강하지 않다는 것을 확인하였다. 이와 같은 분자동역학 결과를 바탕으로 멀티스케일 모델을 개발하여 복합재료에서 나타나는 현상을 묘사하였다. 제안된 멀티스케일 모델을 이용하여 다양한 조건의 복합재료에 대한 특성 예측이 가능하다.

• Venture DIGEST
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• s.101
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• pp.28-29
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• 2006

지난 8월 한 아시아계의 젊은이의 놀라운 기타 연주 모습이 유튜브에 올라 화제가 되었다. 동영상의 주인공은 재미교포인 임정현씨로 이후 뉴욕 타임즈에서 이를 대대적으로 보도해 우리나라에서도 큰 화제가 되었다. 일반인을 순식간에 유명인사로 만드는 유튜브는 실리콘밸리 젊은이들의 개인 동영상 공유를 위해 태어났지만 지금은 세계를 뒤집는 힘을 발휘하고 있다.

• Journal of the Korean Chemical Society
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• v.54 no.4
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• pp.465-470
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• 2010

Using interesting video clips corresponding to lesson subjects for students who favour visual representation is one of the good methods to enhance students' preference for science class. There are many moving picture web sites to get video clips easily via internet and 'YouTube' is very popular and one of the largest reservoir. In this study, every student in the 'Chemistry I' class, which is a class for 11th grade, was requested to search a video clip corresponding to lesson subjects and to make a presentation in the class. After 1st semester, students' response about the class using YouTube was examined by survey. As a result, students preferred and were interested in the class using YouTube than class centered on textbook. And students preferred YouTube clips showing unusual experiments that were related with contents of subject. In addition, experiments and watching their real phenomena were an interesting factor and helpful factor of learning chemistry in YouTube video clips, respectively. However, translation of English used in the video clips seemed to be a difficult part for students.

• Journal of Science Education
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• v.45 no.1
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• pp.118-128
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• 2021

In this study, as the viewing characteristics of users of YouTube video content related to science education, 'Inflow and Access' is analyzed to find out the interaction between learners and the system, and 'Reaction and Subscription' to find out the interaction between learners and contents. To this end, the YouTube channel "Elementary Science TV," was selected as the subject of research. The channel is mainly focused on the contents of elementary science textbooks, STEAM, and gifted education. The channel's data of YouTube studio was analyzed. The following results were obtained through data analysis: first, as a result of 'Inflow and Access' analysis, YouTube video content related to science education was most often introduced through external links, and the access device was mainly a computer. Second, as a result of the analysis of 'Reaction and Subscription,' 'like' and commenting performed as a reaction to the video were less than 1% of the number of views. Most users watch without a subscription, and watch for longer when using self-directed. Although this study was analyzed through a limited channel called 'Elementary Science TV,' we were able to discover a little about the users' viewing characteristics of YouTube video contents related to science education. In the future, it is expected that it can be used as a basic material for creating videos related to science education for remote classes, establishing a science education video platform.

• The Journal of the Korea Contents Association
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• v.22 no.8
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• pp.1-13
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• 2022

This study examined the interactive effects of selective exposure, political orientation, and political interest on YouTube political video users' attitude polarization. The results are presented as follows. In relation to research question 1 and 2, attitude polarization toward selective exposure and political orientation, selective exposure and political interest of YouTube political video users was examined. As a result, in the same selective exposure, the main effect on attitude polarization 'I' was found. Therefore, it was found that the higher the selective exposure of YouTube users to political videos, the stronger the attitude polarization toward YouTube users themselves. In relation to research question 3, attitude polarization toward political orientation and political interest of YouTube political video users was examined. As a result, the interaction effect on the attitude polarization 'I' was found in the political orientation and political interest. Therefore, when political interest in both progressive and conservative tendencies is high, the attitude polarization toward YouTube users themselves is also strengthened.

• Journal of Korean Society of Archives and Records Management
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• v.22 no.4
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• pp.45-65
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• 2022

YouTube videos of public institutions are digital public records that need to be managed and preserved. As such, the video and the metadata describing the video should also be preserved. This study aims to select the key metadata elements necessary for archiving videos published on YouTube by public institutions. To this end, five high-level areas, namely the description, structure, management, preservation, and user participation, and the metadata elements of 10 subareas, were designed by referring to NAK 8, PREMIS, ISAD(G), and YouTube metadata. Afterward, the metadata elements designed by 14 experts were verified. Lastly, the validity and reliability of the evaluation results were verified. Of the 63 elements, 33 satisfied the validity and reliability criteria. Thus, these elements were selected as the core metadata for archiving YouTube videos in public institutions.

• Composites Research
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• v.30 no.3
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• pp.193-201
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• 2017

Molecular dynamics simulation and the Mori-Tanaka micromechanics study are performed to investigate the effect of the covalent grafting between CNT and polyester on the mechanical behavior and load transfer of nanocomposites. The transversely isotropic stress-strain curves are determined through the tension and shear simulations according to the covalent grafting. Also, isotropic properties of randomly dispersed nanocomposites are obtained by orientation averaging the transversely isotropic stiffness matrix. By addressing the grafting, the transverse Young's modulus and shear moduli of the nanocomposites are improved, while the longitudinal Young's modulus decreases due to the degradation of the grafted CNT.

• Composites Research
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• v.30 no.4
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• pp.247-253
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• 2017

In this study, the mechanical behavior and interface properties of boron nitride nanotube-poly(methyl methacrylate) nanocomposites are predicted using the molecular dynamics simulations and the double inclusion model. After modeling nanocomposite unit cell embedding single-walled nanotube and polymer, the stiffness matrix is determined from uniaxial tension and shear tests. Through the orientation average of the transversely isotropic stiffness matrix, the effective isotropic elastic constants of randomly dispersed microstructure of nanocomposites. Compared with the double inclusion model solution with a perfect interfacial condition, it is found that the interface between boron nitride nanotube and polymer matrix is weak in nature. To characterize the interphase surrounding the nanotube, the two step domain decomposition method incorporating a linear spring model at the interface is adopted. As a result, various combinations of the interfacial compliance and the interphase elastic constants are successfully determined from an inverse analysis.