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수치해석 및 계측자료 분석을 통한 막장볼트의 보강효과에 관한 연구
서경원,김웅구,백기현,김진웅,Seo, Kyoung-Won,Kim, Woong-Ku,Baek, Ki-Hyun,Kim, Jin-Woung 한국터널지하공간학회 2010 한국터널지하공간학회논문집 Vol.12 No.5
국내의 경우 터널 지반보강증 강관다단그라우팅 공법이 폭넓게 시용되지만 해외의 경우 시공성 및 경제성이 막장볼트 공법이 흔히 적용되고 있다. 본 논문에서는 국내 도로터널 붕락 발생시 적용한 강관다단그라우팅 및 막장볼트의 적용효과에 대해서 수치해석을 통해 분석해 보았다. 또한 해외 시공사례의 계측데이터를 바탕으로 두 공법의 보강효과에 대해 분석해 보았다. 본 연구를 통해 막장 전면에 파쇄대가 발달하는 경우 페이스공법도 막장보강에 효과적임을 알 수 있었다. Unlike in Korea where steel pipe-reinforced multistep grouting is of commonly used methods for tunnel reinforcement, face bolt method is more widely used due to its better workability and lower construction cost in other countries. In this paper, the effects of both methods after tunnel failure were numerically analyzed and verified based on the oversea construction experiences. As a result it is concluded that the face bolt method may be effective to reinforcement especially when there are some fractured zones developed in the face of tunnel.
산화알루미늄 분말의 탄소열환원 및 직접 질화반응을 통한 질화알루미늄 나노분말의 합성
서경원,이승용,박종구,김성현,Seo, Kyung-Won,Lee, Seong-Yong,Park, Jong-Ku,Kim, Sung-Hyun 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.6
Aluminum nitride (AlN) nanopowders with low degree of agglomeration and uniform particle size were synthesized by carbothermal reduction of alumina and subsequent direct nitridization. Boehmite powder was homogeneously admixed with carbon black nanopowders by ball milling. The powder mixture was treated under ammonia atmosphere to synthesize AlN powder at lour temperature. The effect of process variables such as boehmite/carbon black powder ratio, reaction temperature and reaction time on the synthesis of AlN nanopowder was investigated.
한반도 서해안 변산-태안지역 연안 퇴적물과 육상지질과의 지화학적 상관관계
서경원,지정만,장윤호,Seo, Kyoung Won,Chi, Jeong Mahn,Jang, Yoon Ho 대한자원환경지질학회 1998 자원환경지질 Vol.31 No.1
A geochemical study was carried out to define how marine shore sediments are related to their terrestrial source rocks in the region of Taean and Byunsan Peninsula, western Korea. The lithology of the coastal part of the study area is composed of Pre-Cambrian granite gneiss, schist, Jurassic terrestrial sedimentary rocks, and Cretaceous plutonic intrusives. Shore sediments are transported from three drainage tributaries. The sediments consist of quatrz with clay minerals, such as illite, kaolinite, smectite, chlorite. Heavy minerals include hematite, ilmenite, rare amount of zircon and apatite. Compared to those in coastal rocks, amount of heavy minerals in the sediments is considerably low. The low content of heavy minerals is thought to be attributed to the heavy mineral detainment in the river beds and influences of tidal currents which cause heavy minerals to accumulate in specific spots. Chemical composition of the major and trace elements, trace elements, and REE chondrite normalized pattern suggest that shore sediments transported from the corresponding drainage tributary show close mineralogical and geochemical relationships with the source rocks distributed in the Taean and Byunsan Peninsula.
Education and Training Program using HANARO
서경원,한은영,Seo, Kyung-Won,Han, Eun-Young Korean Association for Radiation Protection 1999 방사선방어학회지 Vol.24 No.4
This report will introduce the epitome about the subject, HANARO (Hi-flux Advanced Neutron Application Reactor designed by KAERI in early 1995) Utilization Education Training Program Development and Operation, which is one of the nuclear research basic expansion businesses executed from 1999. 12. to strengthen the usage of HANARO. This program consists of the basic reactor experiments program for university students who have specialty of nuclear and other engineering, and the special research education program for faculties from universities and researchers from industrial fields. Principle lessons are reactor operation, radioisotope production, neutron activation analysis, neutron radiography, radiation shield (health physics), nuclear fuel combustion measurement by gamma scanning arrangement, and CNS (Compact Nuclear Simulator) and so on.