• Journal of Power Electronics
• /
• 제11권6호
• /
• pp.922-930
• /
• 2011

In this paper, two radial basis function neural networks (RBFNNs) are used to dynamically identify harmonics content in converter waveforms based on the p-q (real power-imaginary power) theory. The converter waveforms are analyzed and the types of harmonic content are identified over a wide operating range. Constant power and sinusoidal current compensation strategies are investigated in this paper. The RBFNN filtering training algorithm is based on a systematic and computationally efficient training method called the hybrid learning method. In this new methodology, the RBFNN is combined with the p-q theory to extract the harmonics content in converter waveforms. The small size and the robustness of the resulting network models reflect the effectiveness of the algorithm. The analysis is verified using MATLAB simulations.

• Educational Technology International
• /
• 제9권2호
• /
• pp.123-142
• /
• 2008

The purpose of this study was to examine how computer conferencing might facilitate collaborative learning for students to engage in meaningful discussion. The participants in this study consisted of the instructor and the students in a graduate level course. Different sources of evidence were used to triangulate the data: in-depth interviews, content analysis of transcripts of discussion, and other archival data including course syllabus, presentation materials, and lecture notes. Participants perceived web-based learning as collaborative process, providing opportunities to share the idea, respect and evaluate different perspectives, and co-construct new insights. Analysis of the data revealed several challenges related collaboration in a web-based learning environment: absence of a sense of community, technical problems, adaptability to different types of learner, and managing the discussion. The data also indicated that a variety of strategies were used to facilitate learning: building a sense of community, technical support, developing instructional methodologies, class size, and design of the content.

• 한국콘텐츠학회논문지
• /
• 제12권5호
• /
• pp.103-112
• /
• 2012

본 연구는 과학대중화에 있어 중요한 역할을 수행하고 있는 국내 과학전문채널인 'YTN 사이언스'가 시청률, 콘텐츠, 제작비의 부족을 드러내고 있다는 문제인식 하에, 우선 현행 국내 과학전문채널의 프로그램 편성과 운영현황, 홍보 전략을 탐색적으로 확인하였다. 다음으로 미국(디스커버리 채널, 내셔널지오그래픽 채널), 영국(BBC Knowledge), 일본(사이언스채널), 중국(CCTV 10) 등 해외 각국의 과학방송채널 특히, 중요 프로그램들을 분석하여 향후 국내 과학전문채널에 활용 및 접목시킬 수 있는 가능성을 모색하였다. 이러한 현실진단과 해외사례분석을 통해 다양한 시사점을 확인하였으며, 이를 통해 제시될 수 있는 콘텐츠 개발 및 홍보전략은 다음과 같다. 우선 콘텐츠가치 제고를 위한 편성전략의 수정이 필요한 바, 타깃 시청집단과 시청자 라이프스타일을 고려한 편성 재조정, 줄띠편성(Stripping)을 통한 시청습관화 전략, 프라임타임(prime time)대의 전략 프로그램 배치가 필요할 것이다. 다음으로 콘텐츠제작 및 활용전략 측면에서는 콘텐츠 제작의 이중적 전략(지식전달, 흥미전달의 두 분야로의 구분), 프로그램의 대표 캐릭터의 기획과 활용, 한국적 과학기술소재의 선택, SNS와의 전략적 연계, 소재의 다변화와 심층화, OSMU 활성화 전략이 요구될 것이다. 마지막으로 홍보전략 차원에서는 과학관련 행사 개최와 중계방송을 통한 채널 인지도 제고, 잡지 및 단행본 발간 등 인쇄매체로의 확장을 통한 홍보전략 수행, 온라인/모바일 홍보 전략의 강화 등을 제시할 수 있겠다.

• 한국콘텐츠학회논문지
• /
• 제14권5호
• /
• pp.390-402
• /
• 2014

본 연구는 Sturges의 위기단계 모델을 바탕으로 K리그 승부조작 사건에 대한 기사보도 빈도, 정보원 그리고 프로축구연맹의 위기대응 커뮤니케이션 전략을 분석하였다. 언론에 보도된 118개의 K리그 승부조작 관련 기사를 대상으로 빈도분석, 내용분석을 실시하였다. 위기단계별 위기대응 커뮤니케이션 전략의 분석단위는 문장단위로 분석하였다. 분석결과 위기단계별 언론보도의 빈도는 위기발생단계에서 가장 높게 나타났다. 보도내용에 대한 정보원은 프로축구연맹, 대한축구협회, 구단, 감독, 선수, 문화체육관광부, 검찰, 전직선수 및 감독, 축구전문가 등 다양한 정보원이 활용되었으며, 이들 중 프로축구연맹이 모든 위기단계에 걸쳐 가장 높은 인용빈도를 보였다. 프로축구연맹의 위기대응 커뮤니케이션 전략은 전체적으로 재발방지를 위한 조치를 취하는 개선행위 전략을 가장 많이 구사한 것으로 나타났다. 구체적으로 위기발생단계에서는 팬들에게 사과하고 재발방지를 약속하는 개선행위 전략을 구사하였으나 변명, 책임전가 등, 대응전략의 일관성을 해치는 전략이 동시에 사용되기도 하였다. 반면에 만성적위기단계와 위기종결단계에서는 재발방지대책과 사건에 연루된 선수들에 대한 징계조치를 취하는 개선행위전략이 일관성 있게 나타났다. 한편, 구단과 선수의 위기대응 커뮤니케이션 전략은 프로축구연맹의 위기대응 커뮤니케이션 전략과 일관성이 없는 것으로 나타났다. 이러한 연구결과에 대한 시사점과 향후연구 방향을 제시하였다.

• 대한가정학회지
• /
• 제49권1호
• /
• pp.1-16
• /
• 2011

This study analyzed the items for the Home Economics teacher selection test, which were carried out through the school year 2002 to 2010, based on Pedagogical Content Knowledge in Home Economics Education (H-PCK). Two frameworks were used: (1) H-PCK matrix transformed from the Content Knowledge in Home Economics Education (H-CK) and the Pedagogical Knowledge; (2) Five components of H-PCK. The results of this study were as follows: (1) The test items were classified into H-CK items and H-PCK items from the H-PCK matrix analysis. (2) While the number of items on knowledge of teaching strategies was the highest, no item on knowledge of understanding students was identified. Since the test can be considered as Measurement-Driven Instruction, it will have backward influences on the teacher education program in universities. Thus, if promising and capable new Home Economics teachers are to be recruited, the test items should include all the components of H-PCK.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제11권5호
• /
• pp.2398-2415
• /
• 2017

Content-Centric Networking (CCN) is a new Internet architecture with routing and caching centered on contents. Through its receiver-driven and connectionless communication model, CCN natively supports the seamless mobility of nodes and scalable content acquisition. In-network caching is one of the core technologies in CCN, and the research of efficient caching scheme becomes increasingly attractive. To address the problem of unbalanced cache load distribution in some existing caching strategies, this paper presents a neighbor cooperation based in-network caching scheme. In this scheme, the node with the highest betweenness centrality in the content delivery path is selected as the central caching node and the area of its ego network is selected as the caching area. When the caching node has no sufficient resource, part of its cached contents will be picked out and transferred to the appropriate neighbor by comprehensively considering the factors, such as available node cache, cache replacement rate and link stability between nodes. Simulation results show that our scheme can effectively enhance the utilization of cache resources and improve cache hit rate and average access cost.

• 한국환경교육학회지:환경교육
• /
• 제22권3호
• /
• pp.125-135
• /
• 2009

In this study, we discuss pedagogical content knowledge (PCK) of pre-service environment teachers since PCK is one of the most important professional competencies for teachers. In Republic of Korea, environmental education is taught as an independent subject in middle and high schools. Thus, pedagogical content knowledge (PCK) of environment teachers plays an important role for quality EE at schools. The purpose of this study is to find out the PCK(Pedagogical Content Knowledge) of pre-service environment teachers. Researchers collected and analyzed data from four environmental education department. Study method used a questionnaire for eighty-two pre-service environment teachers. The study results are as follows. Seven part of PCK(Knowledge of Instructional Strategies, Knowledge of Representation, Knowledge of Subject Matter, Knowledge of Evaluation, Knowledge of Students, Knowledge of Curriculum, Knowledge of Environmental Context) exists the significant difference in pre-service environment teachers. The highest part is the Knowledge of Environmental Context and the lowest part is the Knowledge of Evaluation in pre-service teachers. So the curriculum of environmental education department will be changing that emphasize the Knowledge of Evaluation and the Knowledge of Students.

• International Journal of Contents
• /
• 제17권4호
• /
• pp.101-118
• /
• 2021

The prevalence of We-Media short videos has attracted emerging independent fashion designers (EIFD), a new force in the fashion industry directing their brand promotion to We-Media for amassing online followers. However, compared to famous content generators, EIFDs' creative, design-based visual appeal has not provided them with the significant edge. The former's success is admittedly supported by the platform backstage algorithm. Yet, the content is the cornerstone for building relationship between the sender and the reception. The authentic perception of the content is one of the basic appeals for which the audience chooses to follow the source. Therefore, with the EIFD short video as the research content, this study is established from the audience's perspective to understand the different dimensions of their authentic perceptions of EIFDs short video. The study was conducted mainly in the form of the Q method. The collection of 52 Q samples were realized through the Focus Group Interview and literature review on multidimensional authenticity. Thirty-six subjects participated in the sorting of the Q-sets. Finally, four dimensions of audience authenticity perceptions of EIFDs were derived: 'ingenuity', 'relevant', 'transparent', and 'experiential'. The corresponding short video content design strategies are suggested for effective communication of EIFDs and their personal brands.

• 지역사회간호학회지
• /
• 제31권3호
• /
• pp.256-268
• /
• 2020

Purpose: This study aimed to explore ecological factors and strategies for childhood obesity prevention targeting vulnerable children using a community-based participatory research (CBPR) methodology. Methods: The CBPR was conducted by following basic process steps. Participants were 12 community stakeholders such as community child center directors (n=4), vulnerable children's mothers (n=3), community health center officials (n=2), and lay health advisors (n=4); they were purposively sampled from K municipal county in Seoul, South Korea. The qualitative content analysis was performed to explore main themes of the ecological factors and strategies by using data obtained from 5 times of focus group interview. Results: Twelve ecological factors associated with childhood obesity prevention were identified: Intrapersonal factors including emotional overeating; interpersonal factors including permissive parenting style of children's eating behaviors; organizational factors including social workers' less educational opportunities; and community/policy factors including less government financial support. Four ecological strategies for childhood obesity prevention were addressed: Developing obesity prevention programs targeting vulnerable children' lifestyles; promoting parents' active participation in education; building healthy meal service environments through empowering social workers; and building supportive community environment and securing community resources for child obesity prevention. Conclusion: Our findings may be informative in terms of providing a comprehensive understanding of multi-level ecological barriers against vulnerable children' obesity prevention and, moreover, guiding multi-level strategies for preventing childhood obesity targeting children enrolled in community child centers.

• 한국의상디자인학회지
• /
• 제18권3호
• /
• pp.245-260
• /
• 2016

This study explored cases of 3D printing utilization in domestic and overseas fashion industries, and presented utilization strategies for fashion design departments in universities in future by grasping characteristics of newly appearing distribution types through 3D printing. Cases of producing costumes using 3D printing in fashion industry comprised a bikini using the material of Nylon12 that continuum fashion demonstrated, innovative 3D costumes by Iris Van Herpen, Tweed Suit using the material that Chanel manufactured with 3D printing technology, but they were limited to experimental fashion works due to limitations of 3D printer material and printing size. On the other hand, in fashion accessories, with jewelry and shoes at the head of the list, MCM and Kipling also demonstrated bags using this technology, and Elvis Pompilio and Gabriela Ligenza demonstrated 3D printing hat products as well. Except the above, as in glasses and neckties utilizing 3D printing, owing to reduced limitations of time, size and material, 3D printing was found to be utilized in fashion accessories other than costumes. Recently there has been a new consumption and distribution structure coming up focusing on 3D printing technology. That is, in overseas countries, content platforms sharing products modeled by oneself has rapidly appeared, and in our country as well, funnypoly, a 3D content platform appeared in 2015. The appearance of these new types of distribution structures means that the common people can produce design contents, and we believe that it may bring about a change in the traditional way of distribution structure. To walk in step with this change, it is believed that it is necessary for fashion design departments to raise college faculty members who can educate 3D printing, develop curriculum to educate 3D printing, and develop experiential programs connected with middle and high schools.