• 한국군사과학기술학회지
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• 제13권5호
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• pp.933-940
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• 2010

A numerical analysis for the space frame structure under ballistic and blast loads was performed using LS-DYNA, a commercial code. The space frame structure was developed to be adapted to the ground vehicle in the future and it was designed to build with Al7039 frames and lightweight multi-layered panels for the purpose of weight reduction and shock mitigation. The analyses have done for side impacts by a cylindrical projectile and Comp. C-4 explosive representing major threats to the vehicle. The deformed shape of the panel section and stresses as well as accelerations of the frames calculated from LS-DYNA were compared to the test results to validate the analysis model. The internal energies for panels and frames from LS-DYNA were also compared to each other to discern their role in absorbing the ballistic and blast impact.

• 한국산학기술학회논문지
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• 제10권10호
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• pp.2907-2916
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• 2009

민간투자사업은 1990년대 이후 본격화되어 주요 교통시설을 중심으로 진행되어 왔으며 2005년 이후에는 장기간 서비스를 제공하고 임대료 방식으로 사업자에게 대가를 지급하는 BTL 방식의 사업이 도입되어 학교, 군 주거시설, 하수관거 등 다양한 분야의 시설 및 서비스가 제공되고 있다. 정부 재정사업과 차별화되는 민자사업에 대해서 관련된 위험을 도출하고 그 가치를 평가, 위험 발생을 최소화하려는 제도적 노력은 부진한 편이며 특히 장기간 서비스 계약을 통해 이루어지는 BTL 사업의 경우 위험가치 평가 제도의 도입이 시급한 실정이다. 본 연구는 민자사업 성공의 주요 원인으로 알려진 영국 등의 민자사업 위험가치 평가제도를 비교 분석하고 국내 BTL 사업의 실제 사례에 대해 위험가치를 반영한 PSC(Public Sector Comparator)를 구축, 분석하였다.

• 대한공간정보학회지
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• 제16권4호
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• pp.41-48
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• 2008

현재 활용되는 대부분의 3차원 모델은 3차원 객체의 가시화에 중점을 두고 있고 토폴로지 구조를 가지고 있지 않아 3차원 공간분석 및 응용에 있어 한계가 존재한다. 그리고 실내 공간의 수많은 객체들간의 관계를 완전 토폴로지 기반으로 구현하는 것은 복잡도나 연산속도가 지나치게 증가하여 현실성이 떨어진다. 이와 같은 문제를 해결하기 위해 본 연구에서는 공간 DBMS를 이용하여 실내 3차원 공간을 보다 간단하게 구축하는 방안을 제시하였다. 건물 내 각 공간의 공간정보와 속성 정보를 테이블 단위로 저장하면 DBMS의 빠른 질의와 연산 및 분석이 가능하다. 또한 질의를 통해 추출한 공간 데이터를 이용하여 2차원 및 3차원으로 가시화할 수도 있다. 본 연구에서는 층별 CAD 데이터를 공간 DBMS로 저장하여 2차원상의 토폴로지를 구현하고, 이를 3차원으로 가시화 할 수 있는, 2D-3D Hybrid 데이터모델을 제시하였다. 이러한 모델을 공간 DBMS로 구축하고 공간 함수와 질의를 활용하여 2차원 및 3차원으로 가시화 하는 과정을 제시하였고, 이를 이용하는 사례로서 실내 대피 경로 안내 시스템을 구축하는 과정을 예시하였다.

• 한국지반공학회지:지반
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• 제8권2호
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• pp.31-44
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• 1992

지진하중을 받는 완전포화된 모래지반위에 구조물이 있을 경우(비등방상태) 또는 없을 경우 (등방상태)에 대하여 액화의 가능성을 평가하고 간극수압의 발생을 예측하기 위하여 확률론적 그리고 통계적 방법을 사용하였다. 본 연구를 수행하기 위하여 포화된 모래지반의 등방, 비등방상태하의 전단강도와 반복하중과 의 관계를 나타내는 동적전단강도계수들이 제시되었다. 이 전단강도계수들을 사용하여 지진에 의하여 발생되는 간극수압을 예측하는 프로그램과 그리고 저항과 하중계수들에 내포되어 있는 불확실성을 고려하여 액화가 일어날 확률을 구하는 프로그램을 3차원 Random Field Model을 사용하여 개발 하였다. 개발된 프로그램을 하나의 예제에 적용하였다. 그결과 등방상태가 비등방상태보다도 액화의 가능성이 높았고 상재하중이 커질수록 액화의 가능성은 낮았다. 또한 간극수압비는 Kc 값이 증가함에 따라 감소하는 경향을 나타내었다.

• 한국건축시공학회지
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• 제10권1호
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• pp.155-162
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• 2010

세계 시장에 먼저 뛰어든 건설업계에 이어 국내 설계분야 또한 최근 해외 진출이 활발해 지고 있으며, 그의 대부분은 디자인빌드(Design-Build)계약을 통해 동남아, 중동지역을 중심으로 점차 확대되고 있다. 그러나 계약단계에서 다수의 이해관계자가 존재하는 해외건설의 특수성으로 인한 업무상 많은 시행착오와 그로 인한 실패 사례도 증가하고 있는 실정이다. 이에 본 연구에서는 건설 분야의 해외진출 현황 통계 및 사례들을 통해 문제점을 제시하고, 전문가 인터뷰와 설문조사를 실시하여 건축설계분야 해외건설 계약단계의 효율성 저해요인을 분석하였다. 분설 결과를 바탕으로 마스터아키텍트제도 도입 및 내부 평가조직 구성을 통한 문제점 개선방안을 제시하였고, 이는 해외건설시장의 신규 진출 기업에게 실무적 자료로 활용 될 것으로 기대한다.

• Journal of Advanced Marine Engineering and Technology
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• 제33권6호
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• pp.843-851
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• 2009

Much work has already been done to control and regulate the worldwide problems caused by climate change, particularly the issues on greenhouse gas (GHG) emissions. Carbon dioxide ($CO_2$), having the highest form of concentration among GHGs composed around 1.0 billion tons of emission, and comprises about 98% of the total emissions from the shipping industry. Korean trade mainly rely on the sea transportation. Korean ship tonnages that was brought about by shipbuilders all over the country, continues to grow annually due to the prevailing demands on goods or material supplies and depicting only a small part of the global maritime activity. Nowadays, new build ships coming from the Korean Shipbuilders are being optimized by hull, structure and appendages design, The operational capability of the propulsion and auxiliary machineries in its maximum capacity to achieve the highest possible efficiencies for energy and onboard power use to mitigate $CO_2$ emissions are continually being done through the help of research and development. In this paper, the energy efficiency design index and anboard power capacity of Korean new build ships have been analyzed with response to data collected by ship types, and its respective fuel consumption in relation to $CO_2$ emission results. In response to climate change convention outcome proposals, the best way for the new build ships to become energy efficient is by lowering its operational speed thru adopting the state of the art diesel propulsion engines, patronizing the best sailing practice to lower the transportation cost on the different sea trade routes also helps in $CO_2$ mitigation.

• 한국의학물리학회지:의학물리
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• 제28권1호
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• pp.33-38
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• 2017

Creating individualized build-up material for superficial photon beam radiation therapy at irregular surface is complex with rice or commonly used flat shape bolus. In this study, we implemented a workflow using 3D printed patient specific bolus and describe our clinical experience. To provide better fitted build-up to irregular surface, the 3D printing technique was used. The PolyLactic Acid (PLA) which processed with nontoxic plant component was used for 3D printer filament material for clinical usage. The 3D printed bolus was designed using virtual bolus structure delineated on patient CT images. Dose distributions were generated from treatment plan for bolus assigned uniform relative electron density and bolus using relative electron density from CT image and compared to evaluate the inhomogeneity effect of bolus material. Pretreatment QA is performed to verify the relative electron density applied to bolus structure by gamma analysis. As an in-vivo dosimetry, Optically Stimulated Luminescent Dosimeters (OSLD) are used to measure the skin dose. The plan comparison result shows that discrepancies between the virtual bolus plan and printed bolus plan are negligible. (0.3% maximum dose difference and 0.2% mean dose difference). The dose distribution is evaluated with gamma method (2%, 2 mm) at the center of GTV and the passing rate was 99.6%. The OSLD measurement shows 0.3% to 2.1% higher than expected dose at patient treatment lesion. In this study, we treated Mycosis fungoides patient with patient specific bolus using 3D printing technique. The accuracy of treatment plan was verified by pretreatment QA and in-vivo dosimetry. The QA results and 4 month follow up result shows the radiation treatment using 3D printing bolus is feasible to treat irregular patient skin.

• Bulletin of the Korean Chemical Society
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• 제27권3호
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• pp.386-388
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• 2006

Membrane proteins in highly oriented lipid bilayer samples are useful for membrane protein structure determination. We used in the past planar lipid bilayers which were aligned and supported on the glass slide. These samples were mechanically aligned in a magnetic field. However, these stacks of glass slides with planar lipid bilayers are not well suited for use with a commercial solid-state NMR probe with a round coil. Therefore, a homebuilt solid-state NMR probe was built and used with a stack of thin glass plates wherein the RF coil was wrapped directly around the flat square sample. Recently, we began to use magnetically aligned bicelles that are suitable for the structure determination of membrane proteins by solid-state NMR spectroscopy without any effort to build a flat square coil probe. These bicelle samples are well suited for use with a commercial solidstate NMR probe with a round coil, are very easy to prepare and are very stable, so that they can be kept for more than a year. In this paper, we present the solid-state NMR spectra of optimized and magnetically oriented bicelle samples of membrane proteins.

• 한국조경학회지
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• 제23권4호
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• pp.97-110
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• 1996

This study is about the application of visual structure and presentation of film as one of new methods for design of sequential landscape. The primary objective of the study is to present the basis of applicable and reasonable D니. In applying components of film to DSL, if it is compared with sequential landscape, the film is collection of shots while sequential landscape is accumulation of sceneries. Film and sequential landscape give us a whole meaning different from the meaning itself of a shot or scenery in its experience. The study build a tentative technique of DSL which has the following stages : 1) Goal setting and making out a scenario 2) Analysis and investigation 3) Selection process of definite form 4) Drawing up conti., sketch and notes, It is expected that the technique presented in this study could be a basis for further study of DSL.

• 한국주거학회논문집
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• 제10권2호
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• pp.175-183
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• 1999

This study aims at modeling the compositional method in the architectural space and shape. The composition of space is composed of the position and the area in space. Therefore these elements are established to the functional program applied at the behavioral data. The element of spatial structure is position and scale in space, and the composition of spatial shape is developed repitionally to the combination of build-up method. The functional program is being expertised and the scale in building being lager, the importance of functional program is increased. Applied at data of the functional program at spatial structure, the process is developed to the method of combination. The purpose of this study is approached at the degree of application in modeling on the compositional method in architectural space and shape, which is a fundamental aspect on the quantitative analysis of architectural space.