• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2009년도 추계학술발표대회 논문집
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• pp.205-210
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• 2009

Generally, the building's windows and ventilation for the purpose of mining and the vista and windows by emotional engineering design area is a growing trend. According to the flow of energy is lost from the building, will be achieved through the walls and roof and windows. Among these, the window through the loss of about 45% of the entire building is big enough to rate. In addition, the building regulation U-value Limitation of window is $3.3W/m^2$ K in southern regions, while U-value Limitation of wall is $0.35{\sim}0.58W/m^2$ K. It means that the energy loss through windows is six times more than it through wall. Therefore, the purpose of this study is to evaluate the environmental performance of the super window system by verification experiment. The results of this study are as follows; 1)Thermal performance of insulated Super Window measured as $1.44W/m^2$ $^{\circ}C$ 2)Required energy for heating was cut down about 5.3% from 266.99 $MJ/m^2$ yr to 252.85 $MJ/m^2$ yr 3)Super Window's reduction rates increased 4.1% from 31.48% to 35.58% when it is compared to normal windows. 4)Building energy efficiency rating elevated from 2nd rating to 1st rating.

• 대한토목학회논문집
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• 제38권6호
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• pp.1013-1020
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• 2018

급속한 산업화와 인구증가에 따라 많은 사람들이 도시에서 살기 위해 이동하고 있다. 이러한 도시화는 건설 및 개발 활동에 따라 도심지내 불투수성 면적을 증가시키며, 이로 인해 지하수위가 낮아지고 유역내 첨두홍수량이 커지며 토양유실이 증가한다. 토양과 수자원을 보전하기 위해서 전세계적으로 유역 관리 사업이 시행되고 있다. 따라서 토양 및 수자원의 보전기술을 활용하여 전체 유역에 대하여 평가하는 것이 바람직하다. 본 연구에서는 한국, 대만 및 필리핀의 녹색건물인증제도(GBRS)의 물관리 관련 항목에 대하여 논의하였다. 또한 G-SEED(한국), BERDE(필리핀), EEWH(대만)의 용수관리 기술의 평가기준을 적용하고 비교하였다. 본 연구의 결과는 포괄적인 유역평가 시스템 개발에 활용될 것으로 기대된다. 정량적인 유역평가기준은 미래의 수자원 관련 잠재적 위험도를 파악하고 보다 효율적이고 효과적으로 대응할 수 있을 것으로 판단된다.

• Asia pacific journal of information systems
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• 제15권1호
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• pp.63-79
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• 2005

Recommender systems are a personalized information filtering technology to help customers find the products they would like to purchase. Collaborative filtering is known to be the most successful recommendation technology, but its widespread use has exposed some problems such as sparsity and scalability in the e-business environment. In this paper, we propose a recommendation system, WebCF-PT based on Web usage mining and product taxonomy to enhance the recommendation quality and the system performance of traditional CF-based recommender systems. Web usage mining populates the rating database by tracking customers' shopping behaviors on the Web, so leading to better quality recommendations. The product taxonomy is used to improve the performance of searching for nearest neighbors through dimensionality reduction of the rating database. A prototype recommendation system, WebCF-PT is developed and Internet shopping mall, EBIB(e-Business & Intelligence Business) is constructed to test the WebCF-PT system.

• 한국과학교육학회지
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• 제12권2호
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• pp.97-107
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• 1992

ln this study, we analyzed 5 science textbooks currently used for the 7th graders quantitatively by using the science textbook rating system of Collette and Chiappetta(1986), making meta-analysis of the results of 17 graduate school students of Seoul National University. The rating system consists of 11 categories with detailed items respectively : content, organization, reading level, instruction approach, illustrations, end-chapter teaching aids, laboratory activities in text and/or accompanying manual, teacher aids, indices and glossaries and mechanical makeup of text. Each item in the checklist is to be given between one and five points and the total number of possible points in this rating system is 290. It was shown that 5 science textbooks currently used for 7th-year-students were all "poor" in terms of total points and had, at large, uniformed results especially in 10 items; 7 items concerning moral and ethical implications of science, vocabulary lists, accompanying laboratory manual, annotated editions for test, supply list for laboratory program, student workbook and glossary with low points, while 3 items concerning facilities needed for laboratory activities, activities relevant to the content and textbook size with high points. A Science teachers could get a broad view with a correct impression of the books usefulness in making an evaluation of available textbooks.

• 한국공간구조학회논문집
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• 제9권3호
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• pp.49-58
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• 2009

본 논문은 대공간에 적용된 친환경 계획요소 검토와 친환경요소기술의 적용성을 외국의 사례연구를 통해 분석함으로서 국내 친환경건축물 활성화와 설계기술 향상에 기여할 기초자료를 도출하고자 하였다. 본 연구에서는 2010년 동계올림픽 개최에 즈음하여 최근 완공된 캐나다 동계스포츠시설 2곳과 컨벤션센터 1곳을 대상으로 이들 대공간에 적용된 친환경계획요소를 소개하고, 이들 대공간에 적용된 친환경 건축기법을 LEED Green Building Rating System평가항목을 기준으로 분석하였다.

• 교육녹색환경연구
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• 제18권4호
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• pp.58-65
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• 2019

교육시설은 '공공기관 에너지이용 합리화 추진에 관한 규정'에 따라 2014년부터 '건축물에너지효율 1등급 이상'의 의무대상건축물로 지정되었으며, 동 규정에서 정의하는 공공기관 건축물에 해당되어, 2008년 9월 신·재생에너지 의무대상 건축물로 포함되었다. 또한 2019년 4월 녹색건축물 조성 지원법이 개정됨에 따라, 2020년부터 ZEB인증의 의무대상 건축물로 확정되었다. 따라서 본 연구에서는 2015년 2월부터 2019년 5월까지 "건축물에너지효율등급" 본인증을 획득한 316개의 교육시설을 대상으로 "건물에너지효율등급" 및 "신·재생에너지시스템"설치 현황을 파악하고, 에너지 소요량 및 신·재생에너지 생산량을 기준으로 에너지자립률을 분석하였다. 316개 본인증 교육시설의 "건축물에너지효율등급"에 따른 ZEB 인증등급을 추정하면 1+++ 등급 12개 시설의 경우 1곳을 제외하고 모두 ZEB 5등급 이상으로 나타났으며, 239개의 1++ 등급 시설에서 11%에 해당하는 28곳이 ZEB 5등급 수준에 도달하였다. 따라서 현 수준에서 일반 교육시설의 ZEB 인증은 무리가 있으며, 건물에너지효율 1+++등급 상향과 신·재생에너지시스템 투자가 선행되어야 할 것으로 판단된다.

• 한국초전도ㆍ저온공학회논문지
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• 제5권1호
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• pp.103-106
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• 2003

The short circuit current problem is one of the operational problems that need to be solved by power system engineers in Korea. It is an important issue in the Seoul metropolitan area especially because of highly meshed configuration. Currently, it is regulated by changing 154 kV system configuration from loop connection to radial system, by splitting of the bus where load balance can be achieved, and by upgrading circuit breaker rating. A development project for 154 kV/2 KA SFCL application to 154 kV transmission system after 2010 is proceeding. In this paper, a feasibility study of superconducting fault current limiter (SFCL) is carried out in Seoul metropolitan area to find out the effects of its application and feasibility. This study shows that it can reduce fault current considerably, and as it can minimize the upgrading of circuit breaker rating, the economic potential of SFCL is evaluated positively.

• 한국농공학회지
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• 제45권5호
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• pp.110-116
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• 2003

A catchment modelling system is the summation of the numerous hydrologic, hydraulic and other process models necessary to simulate the response of a catchment to a storm event. Differences between the recorded catchment response and that predicted by a catchment modelling system can arise from structural errors within the catchment modelling system, evaluation errors in the control parameters, or measurement errors in the recorded data being used to assess the reliability of the evaluation of the control parameters. Presented herein is an investigation of the potential measurement errors within the recorded information, which was considered to occur from instrument error in the ultra sonic flow monitor. This investigation was undertaken using three available rating curves at the Musgrave Avenue Stormwater System in Centennial Park, Sydney, developed by Abustan (1997), Water Board (1994), and using Manning's equation.

• 전기학회논문지
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• 제61권4호
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• pp.503-508
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• 2012

Among the high distribution voltage consumers, high-capacity consumers are often applying the grounding resistance method in order to overcome demerits such as erroneous operation of the ground reply or potential increase in the battery at the accident of the isolated neutral system. In this paper, to prevent damage to CLR and GPT in the delay to block the breakdown in the resistance grounded neutral system, this study aims to provide a proper suggestion for continuous rating capacity of GPT to check the appropriateness of CLR size and reduce GPT burden. Thereupon, this study comparatively analyzes CLR current applied in general GPT and the current gained when CLR demanded in the system is used and analyzes the simulated system through simulation using PSCAD/EMTDC in order to suggest GPT's proper continuous rating capacity.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1993년도 봄 학술회 논문집
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• pp.33-40
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• 1993

The Bieniawski's geomechanics classification system(1984) is widely employed as a tool of engineering evaluation of rock masses for tunnel design. Since the siz parameters adoped in the system are believed to control the engineering behavior of rock mass under an external load, no question may be raised to the conceptional idea immanent in the system. However, the rating grade for each individual parameter given in the system may be properly measured since an engineering property of rock mass is not stepwise changed but continuously changed. In order to get the proper rating grade based upon the continuously changed properties in each parameter, several equations presented in this paper are obtained through regration analyses with the grades and median values of properties givne in the system. A FORTRAN computer program given in the paper could provide not only RMR value but also rock mass properties (E, c, o, v, etc.) using the empirical equations.