• Journal of Electrical Engineering and Technology
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• 제12권2호
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• pp.594-600
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• 2017

HVDC transmission systems can be configured in many ways to take into account cost, flexibility and operational requirements. [1] For long-distance transmission, HVDC systems may be less expensive and suffer lower electrical losses. For underwater power cables, HVDC avoids the heavy currents required to charge and discharge the cable capacitance of each cycle. For shorter distances, the higher cost of DC conversion equipment compared to an AC system may still be warranted, due to other benefits of direct current links. HVDC allows power transmission between unsynchronized AC transmission systems. Since the power flow through an HVDC link can be controlled independently of the phase angle between the source and the load, it can stabilize a network against disturbances due to rapid changes in power. HVDC also allows the transfer of power between grid systems running at different frequencies, such as 50 Hz and 60 Hz. This improves the stability and economy of each grid, by allowing the exchange of power between incompatible networks. This paper proposed to establish Korean HVDC technology through a cooperative agreement between KEPCO and LSIS in 2010. During the first stage (2012), a design of the ${\pm}80kV$ 60MW HVDC bipole system was created by both KEPCO and LSIS. The HVDC system was constructed and an operation test was completed in December 2012. During the second stage, the pole#2 system was fully replaced with components that LSIS had recently developed. LSIS also successfully completed the operation test. (2014.3)

• 한국학교보건학회지
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• 제26권1호
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• pp.1-12
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• 2013

Purpose: To examine the effects of appearance satisfaction on school adjustment among adolescents and, further, the mediating effects of self-efficacy between appearance satisfaction and school adjustment. Methods: Conducted a self-report survey of 640 students consisting of sixth, eighth, and tenth graders in the Jeju Special Self-Governing Province. The collected data were analyzed through the independent-sample t-test, the One-way ANOVA, the Pearson's correlation analysis, and the hierarchical multiple regression analysis using the SPSS WIN 18.0 statistical program. Results: First, boys and girls showed statistically significant differences. Boys reported higher levels of appearance satisfaction, school adjustment, and self-efficacy than girls. Second, there were no significant differences in appearance satisfaction and self-efficacy according to the school level. However, statistically significant differences were observed in school adjustment between sixth and eighth graders. Third, students who thought they belonged to the upper class in terms of academic performance and family economy showed the highest level of appearance satisfaction, school adjustment, and self-efficacy. Fourth, there were positive correlations between appearance satisfaction, self-efficacy, and school adjustment. Fifth, self-efficacy proved to have mediating effects between appearance satisfaction and school adjustment among adolescents. In particular, it had a full mediating effect on the relation between appearance satisfaction and adjustment to school life, one of the subfactors of school adjustment. Conclusion: The results suggest that appearance satisfaction is a factor which influences adolescents' school adjustment and that self-efficacy is an important means of mediating between appearance satisfaction and school adjustment. The study is significant in that it highlighted the importance of self-efficacy as one of the important variables to consider when planning various educational programs to help adolescents adjust to their school. In the light of the findings, in an effort to enhance adolescents' self-efficacy and help them lead a harmonious school life in Korea's so-called 'lookism' society, it is necessary to develop and implement counseling programs and character education materials that help adolescents develop a positive perception of their appearance and build self-esteem and self-confidence.

• 정보교육학회논문지
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• 제18권2호
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• pp.265-274
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• 2014

IT 산업의 비중이 높아지면서 세계 주요 국기들에서는 정보교과의 교육을 강화해 가고 있으며, 최근 소프트웨어의 중요성이 점차 부각되면서 소프트웨어 교육을 확대하려는 정보교과 교육과정이 제시되고 있다. 따라서 한국정보교육학회에서는 정보 교과의 내용 체계에 대한 개정안에 대하여 연구하였으며, 정보 교육 내용을 '컴퓨터 시스템', '소프트웨어 제작' 및 '융합활동'의 세 영역으로 구분하는 내용체계를 제시하였다. 이에 따라 본 논문에서는 한국정보교육학회에서 제시한 정보교과 내용세계의 '소프트웨어 제작' 영역 등 정보에 대한 초등학교 및 중학교의 성취 기준을 학년군별로 마련하였다. 그 결과 초등학교 1-2학년군에서는 정보의 이해를, 3-4학년은 정보의 종류를, 5-6학년은 정보의 표현을, 중학교 1-3학년군은 멀티미디어 정보의 표현을 각각 선정하였다. 그리고 이 성취 기준을 도달하기 위한 교수 학습 방법과 평가 방안을 학년군 별로 세분화하여 제시하였다. 이와 같이 본 연구에서 제시한 '정보'에 대한 성취기준, 교수 학습 방법, 평가 방법은 향후 초 중등학교 정보교과 교육과정을 개발하는데 기여할 것으로 기대된다.

• 수산해양기술연구
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• 제48권4호
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• pp.337-345
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• 2012

One of representative Korean fisheries, jigging and angling has 5,700 vessels for squid and hairtail. Hairtail angling is the most typical fishery in Jeju and has an enormous impact on regional economy. However, the price hike in oil and labor costs triggered the necessity of developing a high efficient and energy saving fish luring lamp in recent times. For that reason, this study aimed to analyze the fishing performance of the aircooled LED lamp targeting hairtail angling fishery. The experiment was conducted from September through October in 2009-2011 for a 9.77 ton of fishing vessel setting up 100 lamps. The fishing performance was tested compared with 6 vessels using metal halide lamps in the same waters. As the LED lamp's performance goes up, different lamps were used in 2008 for 80W, 2009 for 120W and 2011 for 180W respectively. The catch and CPUE of the experimental vessel have gradually increased respectively taking the $4^{th}$ and $6^{th}$ place in 2009, the $4^{th}$ and $2^{nd}$ place in 2010, the $1^{st}$ and $1^{st}$ place in 2011 among the 7 vessels. In summary, the LED fishing lamp showed higher fishing performance than comparison groups. It saved 33% of oil consumption and cut down on operating expenses and greenhouse gases emission.

• 정보교육학회논문지
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• 제24권6호
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• pp.563-572
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• 2020

본 연구는 14일간 총 73차시의 강의 및 실습을 통해 예비 코딩 강사들이 직접 초·중학생용 강의 교재를 개발하고 실제 수업을 진행한 코딩 강사 양성 과정에 대해 효과를 검증하였다. 코딩 강사 양성 과정은 25명의 예비 코딩 강사들을 대상으로 '◯◯창조경제혁신센터'에서 주관하고 '◯◯대학교'에서 실시하였고, 수업에 참여한 초·중학생은 각각 15명씩 희망 학생을 공개 모집하였다. 강의 교재 개발은 컴퓨터교육 전공 현직 초등교사 20명을 대상으로 실시한 사전 요구분석 결과를 바탕으로, ADDIE 모형의 절차에 따라 개발하도록 하였다. 수업 실습 중심 코딩 강사 양성 과정을 운영한 결과, 예비 코딩 강사의 창의성이 향상된 것으로 나타났다.

• 수산경영론집
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• 제52권4호
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• pp.1-11
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• 2021

This study is to investigate the determinants of consumption expenditure by considering potential expenditure factors such as socioeconomic, fishing village tourism behavior, motivation for visits, and optional attributes of tourists at Muchangpo webfoot octopus and finespotted flounder festival in Boryeong. The analysis data are 300 questionnaires of visitors to the festival during the 2018 Muchangpo Mysterious Sea Road Webfoot Octopus and Finespotted Flounder Festival from March 17 to April 8, 2018. As a result of analyzing the factors of consumption expenditure of tourists to the festival in Boryeong, socioeconomic factors such as gender and residential groups outside Chungcheong-do have a positive (+) effect on consumption expenditure. Among the factors of fishing village tourism behavior, the only number of days of stay more than one night has a positive (+) effect on consumption expenditure. In addition, in the analysis of factors for motivation to visit the festival, fun/interest and simple rest/leisure have a significant positive (+) effect on expenditure whereas stress relief have a negative (-) effect on expenditure. In the analysis of the factors of festival selection attributes, tourism facilities has a significant positive (+) effect on expenditure, but natural scenery and excellent natural scenery show a significant negative (-) effect on expenditure. The main implications that can be obtained from the results of this study are as follows. First, it suggests that the promotion should be actively conducted outside of Chungcheong Province in order to achieve the original purpose of revitalizing the local economy from the Muchangpo webfoot octopus and finespotted flounder festival. Second, it indicates that there should be a variety of unique high-quality festival programs differentiated from other local festivals, promoting the existence of simple rest/leisure facilities rather than webfoot octopus boat fishing experiences or natural scenery (i.e., mysterious road and sunset) in order to attract festival tourists' spending at the Muchangpo webfoot octopus and finespotted flounder festival.

• 한국식생활문화학회지
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• 제37권5호
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• pp.385-409
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• 2022

This study investigated the trend of research on 'Food science and Nutrition' in previously published papers in the Journal of Korean Society of Food Culture (JKSFC) from 2000 to 2021. Total number of published papers in this category in the JKSFC was 693 which we classified into 7 main categories and 40 subcategories. Of these, 256 articles were on 'experimental cooking' which was the most studied field among 7 main categories. There was a total of 19 published papers under the category of 'microbiology and fermentation'. A total of 133 articles were published on 'functional foods' and provided essential data for discovering new materials under the theme of various physiological active functions of food materials. Furthermore, 107 articles were included in 'food processing and storage', which provided integrated knowledge of economy, stability and practicality based on various technologies. A total of 144 articles was included in the category of 'nutrition'. Under the category of 'nutrition', the most actively studied topic was 'eating behaviors and dietary habits,' and the trending topic was 'use of healthcare big data.' In conclusion, this review would provide trends of various categories of food science and nutrition area for recent 21 years and suggest directions for future research.

• 농촌계획
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• 제19권3호
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• pp.25-36
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• 2013

This study aims to perform the economic analysis to the use of solar power facilities in rural villages considering the climate change scenario. IPCC climate change scenarios in the recently adopted the RCP scenarios (RCP8.5, RCP6.5, RCP4.5, RCP2.6) was used. By RCP scenarios, solar radiation, depending on the scenario in 2100, respectively, 3.6%, 2.5%, 1.9%, 1.1% was assumed to increase. From the economic analysis(payback period is 25 year) on 8 points of each province, in all cases of normal data and four RCP scenarios, at all points analyzed were NPV indicate a negative, BC ratio less than 1.0, respectively. In the case of Mokpo, Chunnam RCP8.5, BC ratio were found to be up to a 0.92, followed by 0.89 in the case of RCP8.5 in Jinju, Kyungnam shows, while the minimum was in Jeju. BC ratio is 1.0 or bigger, in order for the normal solar radiation data in Mokpo, Chonnam was the minimum that it takes 37 years. Similarly, in the case of RCP scenarios, 30 years in Mokpo, Chonnam RCP8.5 and 31 years in the cases of Jinju, Kyungnam and Jeonju, Cheonbuk RCP8.5 were analyzed. It was analyzed that RCP8.5 has the highest value. BC analysis models for each of the factors, the results of the sensitivity analysis, the initial installation costs, electricity sales price, discount rate in the order of economy showed higher sensitivity, and the rest factors showed lower changes. Although there are some differences of solar radiation by region, but in Korea most facilities in rural areas, the use of solar power was considered to be economical enough, considering change of several factors with high sensitivity, such as increasing of government subsidies for the solar power installation of the facility, rising oil prices due to a rise in electricity sales price, and a change in discount rate. In particular, when considering climate change scenarios, the use of solar energy for rural areas of the judgment that there was more economical.

• 문화경제연구
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• 제21권1호
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• pp.21-61
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• 2018

대부분의 국내 공연예술마켓은 소규모일 뿐만 아니라 공연예술 활성화를 위한 플랫폼으로서의 역할과 향후 성장 전망에 있어서도 그 한계를 보이고 있다. 본 연구는 국내 공연예술마켓이 현재 상태를 극복하고 나아가 아시아를 대표하는 공연예술 견본시가 되기 위해서는 마켓 간 협업이 필요하다는 인식에서 시작되었다. 이를 위해 서울아트마켓, 제주해비치아트페스티벌, 경기공연예술페스타 등 국내 공연예술 관계자를 대상으로 마켓의 협업에 대한 설문조사와 심층인터뷰를 실시하고 이를 근거로 마켓 간 협업 방안을 제시하고자 했다. 성공적인 마켓 간 협업을 위해서는 첫째 협업에 대한 발상과 사고의 전환, 둘째 비교우위 평가에 의한 직접 주관하는 프로그램과 협업에 적합한 프로그램의 선별, 셋째 '공연예술 마켓 협업 추진위원회(가칭)'의 설치 운영 및 협업체계의 매뉴얼화, 넷째 네트워크의 공유에서 중앙정부와 지자체 간의 상호 재정 지원을 통한 인력 및 장소의 공유 등 사업의 단계별 추진이 필요하다는 결과를 도출하였다.

• 해운물류연구
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• 제34권4호
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• pp.527-544
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• 2018

본 연구는 국내 연안해운의 승객이동변화를 살펴보기 위해 SNA 분석을 실시하였다. 기존연구에서 적용하지 않았던 가중치가 반영된 연결 중심성을 사용하여 중심성 순위도출의 타당성을 높였다. 연결 중심성 분석결과, 남해권역의 네트워크 구성비율이 높은 것으로 나타났고, 매개 중심성 결과도 남해권역에 속하는 항만이 높은 순위를 기록했다. 서 남해의 통로역할을 하는 제주도, 육지와 섬의 관문역할을 하는 목포, 지리적으로 육지와 가깝거나, 소규모 항만으로 원활히 연결되는 항만들이 높은 매개 중심성을 갖는 것으로 나타났다. 한편 아이겐벡터 중심성 분석결과로는 남해권 항만뿐 만 아니라 서해권 항만들도 상위순위에 많이 포함되었다. 결과를 활용하여 주무부처는 국내 연안해운의 주요 항만들을 파악하고, 지원 우선순위 결정, 항만 연결관계에 대한 현황파악 및 중점 개발지역 관리 등의 전략을 수립할 수 있다. 향후 연구에서는 일반승객과 도서민 승객을 분리하고, 운임, 거리 시간 등의 데이터를 활용한 경제적 측면의 연구가 필요하다.