• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2007.12a
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• pp.123-124
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• 2007

파력발전은 파랑에너지를 이용하여 유용한 에너지를 얻어내는 것인데, 본 논문에서는 그 가운데 진동수주 (Oscillating Water Column)형을 연구 대상으로 취하였다. 이는 외해에서의 파랑에너지를 공기실에 유입 집중시켜 공기실 내 수면의 승강운동을 증폭시키고 이로 인해 발생한 공기실 내의 공기 흐름을 터빈의 구동력으로 사용하는 것을 말한다. 적지 선정과정에서 채택된 곳의 설계파고를 바탕으로 원하는 정격출력인 500kW를 얻어낼 수 있도록 유량과 임펄스 터빈의 최적 직경을 산출하고자 하였는데 개념설계된 파력발전장치의 덕트가 쌍동형 형태를 취하고 있으므로 한 터빈당 250kW급을 목표 발전용량으로 하였다. 지난 연구를 통해서 기 작성된 터빈 성능도표를 활용하여, 본 연구에서는 1차적으로 임펄스 터빈의 개략적인 직경 및 유량을 구하고, 터빈의 자기 기동 특성을 고려하여 최종적인 형상을 구체적으로 도출하였다.

• Korean Institute of Interior Design Journal
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• v.26 no.5
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• pp.16-24
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• 2017

This study examines Safdie's design philosophy: place, purpose, and process and design strategies found in museum buildings. Safdie, influenced by personal background as immigrant, education of McGil University in Canada, apprenticeship from Louis Kahn, is one of the most recognized architects who designed renowned public and cultural buildings after Habitat 67 in Montreal, Canada. In order to reveal design strategies his eight museum buildings has been selected and analyzed in terms of interpretation of context, program presented in floor plan and section design, and the process of integrity found in structure and material. The results of this paper can be summarized as follows: 1) Reflection of existing context and regeneration of the locality has been in a creative way to reinforce the sense of place. 2) The layout of major and gallery space is determined according to the Safdie's interpretation of the site context and this can be categorized into three types. 3) Integration of the innovative structural frame and material has been experimented by using tartan grid and toroid form in the major and gallery spaces. This study is intended to reevaluate the significance of Safdie's design approach to building uniqueness of the site, program and tectonic.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.20 no.7
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• pp.2257-2265
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• 1996

In the cold rolling mill, it is very important that a constrained static flow stress of rolled strip and rolling force calculation model be exactly considered to improve an prediction accuracy for rolling forces. Therefore, in this study, the values of the constrained static flow stress are used by deriving the regression equation which is a function of rolling conditions(FDT, CT) and chemical compositions(C, Si, Mn), previously applied by making the tables of yield strength for hot coils with size. And with the consideration that an elastic deformation part of an rolled strip appears at the entry and delivery side of the contacting area between the work roll and rolled strip is calculated. By applying these methods, the more accurate prediction for rolling force is obtained. As a results, the deviation of thickness is significantly reduced in the rolling direction.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.672-675
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• 2009

동해 울릉분지에서 취득된 다중채널 탄성파자료 해석에 의하면 이 지역에는 가스하이드레이트 부존가능성을 지시하는 해저모방반사면, 탄성파침니/칼럼, 음향공백대, 증폭반사면, 가스분출 구조 등을 포함하는 5가지 탄성파 지시자가 존재한다. 가장 대표적인 지시자인 해저모방반사면은 연구지역의 남쪽사면의 경우 연속성이 양호하고 강한 진폭을 갖는 반면, 북쪽 중앙분지에서는 상대적으로 진폭이 약하고 연속성이 불량하다. 반사도 감소 및 속도 풀업 특징을 갖는 탄성파 침니/칼럼구조는 중앙분지와 북동쪽해역에 주로 분포하며 가스하이드레이트 혹은 가스유체의 부존가능성을 시사해준다. 반사강도가 약화되어 나타나는 음향공백대는 저탁류/원양성 퇴적물이 분포하는 중앙분지에 부분적으로 발달하며, 칼럼과 연계된 음향공백대는 북동쪽 사면저부에 주로 분포한다. 해저모방반사면의 하부에 위치하는 증폭반사면은 연구지역의 서쪽 사면에 분포하며 강한 음의 진폭특성으로 보아 자유가스를 함유한 층으로 해석된다. 가스분출구조는 주로 쇄설성 퇴적물이 우세한 조사지역의 남쪽 대륙사면지역에 광범위하게 분포하며 돔구조 혹은 폭마크 등을 수반한다.

• Journal of Pharmacopuncture
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• v.7 no.3
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• pp.47-57
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• 2004

Objective : In order to study effects of ${\lceil}Persicae\;Semen{\rfloor}$ on the hyperlipidemia rats induced by Triton WR, we have made hyperlipidemia rats by administering Triton WR-1339 for 3 days, then have administered. The results were summerized as follows : 1. The Total cholesterol, triglyceride, LDL-cholesterol, Free fatty acid, phospholipid and CRF(Cardiak Risk Factor) by hypercholesteremic rats injected by Triton WR-1339 of the herb-Acupuncture group were decreased as compared with those of the control group, especialy hypercholesteremic rats injected by Triton WR- 1339 of the herb-Acupuncture+Acupuncture group were some more decreased as compared with those of the control group. 2. The HDL-cholesterol by hypercholesteremic rats injected by Trion WR -1339 of the herb-Acupuncture group were increased as compeared those of control group, especialy hypercholesteremic rats injected by Triton WR-1339 of the herb-Acupuncture+Acupuncture group were some more increased as compared with those of the control group. According to the above results, Persicae Semen showed inhibition on decrease of serum total cholesterol, triglyceride and phosholipid contents as well as inhibition on increase of HDL-cholesterol contents in hyperlipidemia.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.67 no.11
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• pp.1549-1554
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• 2018

Recently the design of railway systems have been performed, based on the analysis of operational conditions and service targets, it is to optimize the effectiveness and efficiency of system operation. Many RAMS requirements have been developed to transform operation conditions into system design characteristics. However, our railway industry has not actived the application of RAMS into system design performance. According to short of RAMS application, many technologies that have been developed are not only applied the existing systems that is operating, but also have not succeed to apply for new systems. In order to design the effective and efficient railway systems that are optimized to operation conditions and service targets, a systems approach and RAMS management are necessary in railway development, operation and maintenance. Therefore, in this study, the RAMS performance requirement design methods are discussed. the allocation methods from system level to each devices of subsystems.

• Journal of Microbiology and Biotechnology
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• v.16 no.7
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• pp.1090-1096
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• 2006

O-Methylation is a common modification reaction found in nature, and is mediated by an O-methyltransferase (OMT). OMTs have been mainly studied in plants, whereas only a few OMTs have been studied in microbes. When searching the Bacillus cereus genome, four putative small molecular OMTs were identified, among which BcOMT-1 was cloned and expressed in E. coli as a his-tag fusion protein. The whole cell expressing BcOMT-1 was used to methylate several flavonoids. Eriodictyol, luteolin, quercetin, and taxifolin, all of which contain 3' and 4' hydroxyl groups, served as methyl group acceptors for BcOMT-1, whereas naringenin, apigenin, 3,3'-dihydroxyflavone, and 3,4'-dihydroxyflavone did not function as substrates. Analysis of the reaction products using HPLC showed two different peaks, and NMR revealed that the methylation position was at the hydroxyl group of either carbon 3' or 4'. Therefore, this showed that BcOMT-1 used flavonoids containing ortho hydroxyl groups and transferred a methyl group to either of two hydroxyl groups.

• Journal of Biosystems Engineering
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• v.33 no.4
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• pp.230-238
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• 2008

Mechanization such as machine harvesting, precleaning, drying and cleaning for rapeseed harvested with high moisture content should be accomplished for biodiesel production. In addition, machine drying and cleaning is inevitable in the mechanization of work, just because rice should be transplanted right after harvesting rapeseed in Korea. Particularly, early harvested rapeseed with the combine have high moisture content and undesirable materials such as stalks and stones which make drying-process difficult and lower the efficiency of drying. Therefore, this study was conducted to develop precleaner and cleaner which could remove foreign substances from harvested rapeseeds. The precleaner consists of throw-in hopper, conveyor, feeding hopper, two precleaning sieves and discharging sections. Precleaning capacity was 1,505 kg/hr in shaking frequency of 370 cpm (cycles per minute) and tilt angles of between $5^{\circ}$ and $7^{\circ}$. The efficiency of precleaning was between 90.9% and 91.5%. The cleaner consists of feeding, shaking, blowing, cleaning and discharging sections. Cleaning performance was 435.4kg/hr in the number of rocking motions of 475 cpm and tilt angle of $10^{\circ}$. The ratios of cleaning, foreign substances and loss were 96.5%, 3.5% and 0.2%, respectively.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.38 no.7
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• pp.727-736
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• 2010

A satellite that has an all-composite structure, STSAT-3(science and technology satellite), was initially developed in Korea. Partially use of advanced composites in space applications such as solar panel is well developed, however the application of an all-composite satellite bus has never been achieved in Korea. This study emphasizes the application of composite technology to the design and fabrication of an all-composite spacecraft bus for small-class satellite STSAT-3. Moreover its structure design concept is totally different from the one that was used in the previous satellites developed in Korea.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06a
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• pp.17-22
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• 2008

최근접 객체 질의(Nearest Neighbor Query)는 질의가 요청된 지점으로부터 가장 가까운 객체를 찾는 질 의로 위치기반 서비스 분야에서 가장 널리 사용되고 있는 질의의 형태이다. 이를 기반으로 한 지역 최근접 객체 질의 (Range Nearest Neighbor), 연속 최근접 객체 질의(Continuos Nearest Neighbor)등의 확장 된 개념으로 다양한 최근접 객체 질의가 제안되어 왔다. 그러나 지금까지의 최근접 객체 질의를 기반으로 한 연구들은 점으로 표현된 질의를 기준으로 하여 최근접 객체를 찾는 기준점 최근접 객체(Point Nearest Neighbor) 질의를 기반으로 하고 있어, 점으로 표현이 불가능한 1 차원 형태의 질의에 대하여 효과적인 최근접 객체를 검색하는 연구는 연구된 바 없다. 본 논문에서는 한 개 이상의 1 차원 형태의 선분으로 이루어진 질의에 대하여 질의 주변의 객체 중 최근접 객체를 찾는 다중선 최근접 객체 질의 (Polyline Nearest Neighbor)를 정의하고 효과적인 질의 처리 알고리즘을 제안하였다. 제안된 기법의 성능 분석을 위한 실험은 객체와 질의가 다양한 형태로 분포되어 있는 환경아래 진행되었으며, 실험 결과는 기대 값과 근접한 결과 값을 얻었다.