함박꽃나무(Magnolia sieboldii)의 추출성분

최인호,이학주,최돈하,박재인,최태호 한국목재공학회 2004 목재공학 Vol.32 No.2

함박꽃나무 수피 및 목부의 EtOH 조추출물로부터 prep. TLC. silica gel 및 Sephadex LH-20 칼럼 크로마토그라피를 이용하여 4종의 화합물을 단리하였다. 이들 화합물들은 NMR, MS 등의 기기분석에 의해 sesquiterpene lactone 구조의 costunolide (Ⅰ)를 비롯하여, 리그난 배당체 화합물인 syringin (Ⅱ)과 1, 2-dihydroxyxanthone (Ⅲ) 및 vanillic acid (Ⅳ)으로 각각 동정하였다. Four phenolic compounds were isolated from the wood and bark of Magnolia sieboldii. The structures were determined as costunolide(Ⅰ), syringin(Ⅱ), 1,2-dihydroxyxanthone(Ⅲ), and vanillic acid(Ⅳ), respectively, on the basis of spectroscopie data.

傾斜地 테라스하우스에서 유형과 경사각도에 따른 密度에 관한 硏究

최규학,이재훈 대한건축학회 2004 대한건축학회논문집 Vol.20 No.10

This study analyzes the dwelling-density through house units-type and the slope-angle from the terrace house complex on slope-site The results are summarized as follows 1) The increase of the floor area ratio concerns with the slope-angle of the site In low slope-angle, it has little difference between combination type, but the more the site incline the more the difference increase In same size of building area, slope-angle and combination-type, floor area ratio of the compact '-' units-type increase more maximum 25%, compared with the 'ㄱ' units-type 2) The building coverage subordinate to the combination-type, the selected units-type and combination-type turn up almost regularly in all inclination 3) The open space ratio per floor area influenced by the slope-angle of the site Inclining, the open space ratio per floor area decreases and so the open space of the house unit, too It is shown, that the difference between types in low inclined slope-sites are bigger than the ones in high inclined slope-sites

합병의 영업성과 개선에 관한 연구 : 외환위기 이후 국내기업을 중심으로

최운열,황재학 서강대학교 경영연구소 2005 서강경영논총 Vol.16 No.2

남북상사중재위원회 운영상의 문제점과 활성화방안

최석범,박근식,김태환,김재학,박선영 한국중재학회 2007 중재연구 Vol.17 No.1

The commercial relationship between South and North Korea is defined under the concept of economic relation and cooperation. To resolve any dispute that can arise from the trade and investment relations between South and North Korea, 'Agreement on the Procedures to Resolve Commercial Arbitration of South-North Korea' came into force in August 2003. Commercial Arbitration Committee of South-North Korea will be organized as the member lists of the committee were exchanged in July 2006 between South and North Korea. This committee must become a central system to settle the trade and investment disputes between South and North Korea. North Korea's Foreign Economic Arbitration Act was enacted to provide the foreign investors with the safe measures in their investments such as dispute resolution. But this Act can not dispute the trade and investment disputes between South and North Korea. The purpose of this paper is to contribute to the activation of arbitration between South and North Korea by studying Commercial Arbitration Committee of South-North Korea introduced by Agreement on the Procedures to Resolve Commercial Arbitration of South-North Korea and Agreement on the Construction and Operation of Commercial Arbitration Committee of South-North Korea and finding the problems and solutions of Commercial Arbitration Committee of South-North Korea.

韓國의 人口移動에 관한 硏究

崔鍾碩,林裁鶴 충남대학교 자연과학연구소 1987 忠南科學硏究誌 Vol.14 No.2

Several projects for the national economic development plannings since 1960's have brought a tremendous change in the whole nation socially, economically as well as geo-demographically Since 1970's advanced industrialization with high technology, achieving a big economic development, has accelerated urbanization, which on the other hand resulted in a serious lack of labor in the rural area. This serious unbalanced distribution of the population between the urban and the rural area has caused not only political and societal gap between the two areas but also the inefficient use of the land. We, with a very dense population, think that the above problems could be solved partly through strong policies of restraint on population growth and on population migration into the urban area. This study has been done as a base for the policies in the followings. 1. In order to observe the phenomenon of population migration, we analyze time series intra and inter-migration and total migration. 2. To investigate the cyclic phenomenon, seasanal variation analysis on one-year base is considered additionally. 3. We investigate, in macro sense, redistribution of population by showing the migration trend based on the center of population gravity and that of geographic gravity. 4. We specially focus on the population moving problem toward the metropolitan area. 5. We end up this study with the possible suggestions for the policy making on the population problem after discussing some predictions of migration trend.

배전용변압기 과부하관리를 위한 복합절연방식 적용

김재철,최재학,박수만 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-

This paper proposed a criterion of overload by analyzing load characteristics and overload rate of tolerance derived from one-pole transformer in distribution power network of KEPCO. On the basic of these analytic results, one-pole transformer of hybrid-insulation scheme having improved overload-withstand characteristics, long-life, high capacity is designed and manufactured in this paper. Temperature-rise characteristics and reliability for overload are verified by characteristics test including overload test with manufactured one-pole transformer. Consequently hybrid-insulation scheme for supervising overload of one-pole transformer can be applied to distribution line system.

비부착 PS콘크리트 구조의 시간의존적 특성을 고려한 비선형 해석에 관한 연구

최정호;김운학;박재근 한경대학교 2008 論文集 Vol.40 No.-

This paper presents a comparative study on nonlinear analysis of the unbonded PSC structure considering time-dependent effect. For developing a finite element analysis program, an unbonded PS tendon model which can represent straight or curved unbonded tendon is proposed. The F.E. analysis program, named RCAHEST(Reinforced Concrete Analysis in Higher Evaluation System Technology), is used. Material nonlinearities of cracked concrete are taken into account by tension, compression, and shear models. And nonlinear material models for reinforcing and prestressing steels are included. These models work with models for time-dependent effect such as aging, creep and shrinkage of concrete and stress relaxation of prestressing tendon. The developed finite element analysis program is verified by comparison with reliable experimental results.

종골 골절 치료에 있어서의 전산화 단층 촬영의 유용성

김학준,하권익,윤정로,심재익,김택선,김영배,이우승,최재혁 대한골절학회 2003 대한골절학회지 Vol.16 No.4

성공적인 경피적 승모판 교련절개술 후 임상 경과와 재협착율

김영학,강덕현,송재관,최기준,이철환,홍명기,김재중,박성욱,박승정 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.2

아이리스를 사용한 이중 모드 원추 혼 안테나의 설계

박재현,최학근 단국대학교 신소재기술연구소 2000 신소재 Vol.9 No.-

본 논문에서는 오프셋 파라볼라 안테나의 일차 복사기로서 세 장의 아이리스로 구성된 이중 모드 원추 혼 안테나를 제시하고 Ku밴드 혼 안테나를 설계하였다. 설계된 안테나의 타당성을 확인하기 위하여 제작하고 복사특성을 측정하였다. 측정결과 설계 제작된 이중 모드 원추 혼 안테나는 11.85GHz에서 E면과 H면의 10dB 빔폭이 거의 일치하고 교차편과 레벨이 -30dB 이하로서 양호한 성능을 보였고, 이론치에 거의 근접한 것으로 나타났다. In this paper, the dual mode conical horn antenna with 3 irises for the primary feed of the offset parabolic antenna is proposed and the Ku-band horn antenna was designed. To verify the validity of the designed horn, the horn antenna is fabricated and he radiation characteristics is measured. It has been shown that the E-plane 10dB beamwdith of the experimental horn is nearly equal to the H-plane 10 dB beamwith, and the cross-polarization level is less than -30dB. And also, the measured results are in good agreement with the calculated results.