• Journal of Energy Engineering
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• v.28 no.1
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• pp.65-72
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• 2019

The Korean government is aiming to produce 20% of the electricity using renewable energy sources by 2030. Ocean renewable energy sources which are abundant in South Korea can do an important role to achieve the goal. This paper introduces a tidal current energy converter utilizing flow induced vibrations which can efficiently work even in the currents slower than 1.0m/s and suggests optimal designs of the tidal energy converter based on speeds of the tidal currents in seven different coastal regions in South Korea. Moreover, the theoretical annual energy production by the tidal converter is estimated at theses costal areas. The total amount of the annual energy production by the tidal energy converter is predicted as 221.77 TWh which is equivalent to 42.3% of the electric consumption of South Korea in 2013. The result shows that the tidal current energy converter can be an important role to achieve the goal of the Korean government.

• Journal of the Korean Society of Earth Science Education
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• v.15 no.3
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• pp.391-409
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• 2022

In this study, class demonstrations conducted integrating science education and 'Education for Sustainable Development (ESD)' by pre-service science teachers were analyzed, focusing on the concept of 'sustainable happiness' and the main elements of 'complexity theory'. In addition, changes before and after participating in such education implementation were analyzed from various angles. Through this, pre-service science teachers tried to derive implications for developing multidimensional teacher professionalism in ESD. The main findings are as follows. First, as a result of peer evaluation of class materials and class demonstrations designed by pre-service science teachers, the average of the integration for 'sustainable happiness' was relatively high. Next, it was analyzed that the elements of 'sustainable happiness' and 'complexity theory' generally had a positive correlation with ESD. In addition, after participating in the study, pre-service science teachers considered individual and social behavioral patterns as important in the sense of ESD. Regarding the need to integrate science education and ESD, pre-service science teachers thought it was necessary to deal with the concept of 'sustainable happiness' in science education to understand a sustainable way of life. It was analyzed that the elements of 'sustainable happiness' and 'complexity theory' generally had a positive correlation with ESD. It was found that pre-service science teachers' confidence in incorporating ESD in science classes was significantly higher after participation in the study. In addition, it was analyzed that pre-service science teachers have come to think more about the role of teachers who can communicate with students and think about happy lives together than before. Overall, it is thought that pre-service science teachers have come to think of multidimensional science teacher professionalism by applying the perspective of the teaching and learning strategy of the new ESD, which integrates the concept of 'sustainable happiness' and elements of 'complexity theory'.

• Journal of Korean Academy of Nursing Administration
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• v.2 no.2
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• pp.121-129
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• 1996

간호 행정학분야에 있어서 이론의 발전 단계는 아직도 초기단계에 있으며 계속 개발되는 중이다. 간호행정의 이론개발은 크게 3 단계로 나눌 수 있는데, 첫째, 다른 학문으로부터 빌려온 이론들을 간호학에서 사용한 단계, 둘째, 간호와 경영지식을 합성화시킨 이론적 모델을 사용한 단계, 셋째, 간호관리를 의한 중재(Management Intervention)개발의 단계이다. 간호행정이론 개발의 새로운 추세인 간호관리를 위한 중재가 어떻게 Middle-Range Theory를 구축하는데 공헌하는지가 서술되며, 그에 대한 예가 제시된다.

• Child Health Nursing Research
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• v.19 no.3
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• pp.149-158
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• 2013

Since 1990, descriptive studies about the concept of client advocacy have been published in the health journals. However, empirical studies of the concept are still lacking. There are not enough bases to apply the concept of client advocacy in nursing practice. The purpose of this paper is to encourage empirical research about client advocacy by clarification of the concept and to discusses application of the theory in child healthcare. The literature was reviewed that empirical studies on client advocacy conducted after the year 2000. The changing trends in the client advocacy concept was examined; it was changed from the philosophical concept to nursing action and changed from individual advocacy to collective advocacy, with the rise of the self advocacy concept. The research trends on client advocacy evolves from descriptive study to quasi-experimental study and instrument development study, with diversification and expansion of research methods, advocates, clients and settings. The advocacy role of the nurse in child healthcare is significant due to the child's lack of self determination ability. In ill child care, the application of individual advocacy is potent, while in healthy child care, collective advocacy, policy advocacy, and social advocacy is effective.

• Information and Communications Magazine
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• v.30 no.12
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• pp.66-75
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• 2013

수학을 기반으로 경제학에서 널리 사용되던 게임이론이 최근 네트워크 디자인 분야에서 중요한 수단으로 활용되고 있다. 통신 네트워크에서 게임이론의 응용 분야로는 혼잡 제어, 네트워크 라우팅, 네트워크 부하균형, 통신보안, 대역폭 가격선정, 무선 협력통신, 트래픽 컨트롤, 전력제어, 자원 할당과 서비스 품질 보장 등 다양한 분야가 존재한다. 본 고에서는 최근 주목받고 있는 게임이론의 기본개념과 발전해온 역사, 그리고 대표적인 게임모델들에 대하여 간단히 소개하고자 한다.

• Journal of the Korean Society for Library and Information Science
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• v.32 no.4
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• pp.187-208
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• 1998

The primary objectives of this paper has been to survey the present status quo and problems of the library and information science and to pursuit the perspectives of library and information science. For these, this paper has discussed (1) historical development of the library and information science, (2) the library and information science researcher's approach methods to the library and information science theory, (3) the present status quo and problems that are confronting in the area of the library and information science and (4) the perspectives of the library and information science and especially the library and information science education programs.

• Journal of Environmental Impact Assessment
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• v.10 no.4
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• pp.261-277
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• 2001

이 글을 다음과 같이 요약한다. 첫째, 경제발전은 인간의 욕구를 충족시키기 위한 수단이다. 둘째, 경제발전에 관한 여러 이론들이 있다. 어떤 한 이론도 경제 발전을 충분히 설명하지 못한다. 여러 가지 복합적 요인을 고려하는 것이 타당하다. 셋째, 경제발전의 영향은 환경을 파괴한다는 증거가 있다. 넷째, 지속가능한 시민복지사회를 만들려면 동양적 환경가치관의 재발견과 적용이 필요하다. 다섯째, 1972년 스톡홀름 회의이후 환경보존과 관련하여 여러 가지 제도적 발전이 있었다. 그중 Agenda 21의 실천은 정부와 시민에게 중요한 움직임이다. 여섯째, 더 넓은 지속가능성 즉 5 가지 지속가능성의 적용을 권장한다. 특히 문화적 지속가능성의 실천이 중요하다. 일곱째, 국가투자를 적정화하면 환경투자비율을 높이면서 국민복지를 향상시키고, 경제성장을 지속하는 것이 가능하다. 여덟째, 지속가능한 시민복지사회를 만들려면 개인과 단체가 전략계획의 실천을 일상화해야한다.

• Journal for History of Mathematics
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• v.19 no.4
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• pp.107-116
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• 2006

This article reviews the exciting developments in Morse theory by S.Smale, Freedmann and others, including a proof of the generalized Poincare' Conjecture in the handle body theory. We study its relations with handle body theory _and geodesic theory.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.20 no.2
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• pp.232-237
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• 2008

A method to generate electric power from small scale water tank. For this purpose, manufacturing tank is investigated, measuring water level change at any time, and finally comparing experimental and theoretical value, are performed. Inner and outer tank are made to simulate flood and ebb generation. Two sets of pipe are connected between tanks, and experiments are performed under varying flowrate. Coefficients of flowrate are calculated comparing water level change data and theoretical value. Measured and theoretical water levels are highly correlated, and this ascertains that analytical equation simulates real water level changes well. Flowrate change depending on the existence of propeller and valve, on flood and ebb generation, shows the necessity of experiments in the process of manufacturing electric power system. Moreover, total energy calculated from experimental data agrees well with that of theoretical equation. In spite of small tidal power output, this generating system with optimum water tank can be applied to any place where high water level change occurs, and can make a contribution to producing new and renewable energy consequently.

• Journal of Agricultural Extension & Community Development
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• v.19 no.1
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• pp.179-194
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• 2012

본 논문은 조직이론 가운데 주로 신제도주의경제학의 기본이론으로 다음 세 가지 내용을 탐색했다. 첫째, 50년대 이후 중국 농촌조직의 발전성과에 대해 개괄했다. 둘째, 2001년 중국의 WTO 가입 전후 농촌조직개혁의 방향에 대한 신제도주의경제학의 시각을 탐색했다. 셋째, 2006년 <사회주의신농촌건설>의 시작과 <농민전업합작사법> 공표 이후 중국 농촌합작조직의 발전 방향에 대해 탐색했다. 본문은 주로 신제도주의경제학의 기본이론으로 중국 농촌합작조직의 변화와 전망에 대한 저자의 시각에 대해 서술했다.