• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2002년도 생물공학의 동향 (X)
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• pp.145-148
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• 2002

막 생물반응기를 이용하여 일정한 TMP 와 일정한 플턱스 여과방식에 따른 실험을 수행한 결과, 일정한 TMP 에서보다 일정 한 투과 플럭스에서 여과하는 것이 여과의 초기 단계동안 과도한 오염을 피할 수 있으므로 바람직하다는 것을 확인하였다. 투과 플럭스를 고정시킨 실험에서 속도에 대한 임계 플럭스 증가 간격은 선형적이었으며, supra-critical zone 과 sub-critical zone 의 두 지대로 구분되었다. 막 생물반응기는 화학적 세정 없이 장 기간 운전되어야하므로 TMP를 고정시키는 깃보다 플럭스를 고정시켜 운전하는 것이 효과적이여, 최적운선조건은 sub-critical zone 경계층 위, 임계플렉스 바로 아래상태임을 알 수 있었다.

• 한국실내디자인학회논문집
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• 제19권3호
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• pp.154-161
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• 2010

Domestic distribution environment in Korea has rapidly and qualitatively been developed due to the open of distribution market. However, the function of commercial establishment goes beyond the place value that simple transaction of capacity takes place, and it is recognized as life groove space enhancing the satisfaction of costumers' purchasing pattern. For this reason, there has been the need to change the purchasing environment of commercial space. The change factors of commercial space contributed to the establishment of consumption identity formed by change of consumers' lifestyle and the purchasing pattern. It is necessary to see the change factors of the purchasing pattern as the conversion of distribution environment in terms of supplier and as the change of consumers' lifestyle in terms of consumers. In reality, however, the commercial facility ill-imitated the advanced model and qualitatively was developed. In this situation, the change of the purchasing pattern according to the conversion of facility is needed as an early stage. The purpose of this study is to analyze the overflow supply of commercial facility. Also It will discuss the plan characteristics of commercial space conversion of facility conforming to the change of the purchasing pattern that is predicted in the lifestyle on a conversion stage of facility.

• 한국자동차공학회논문집
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• 제15권3호
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• pp.141-146
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• 2007

In this study, the effects of change in ambient gas viscosity on spray structure have been investigated in the high temperature and pressure field. To analyze the structure of evaporative diesel spray is important in speculation of mixture formation process. Emissions of diesel engines can be reduced by the control of the mixture formation process. Therefore, this study examines the evaporating spray structure in the constant volume chamber. The viscosity of ambient gas was selected as the experimental parameter, is changed from 21.7 mPa s to 32.1 mPa s by changing in ambient gas temperature. In order to obtain images of the liquid and vapor-phase of injected spray, exciplex fluorescence method was used in this study. The liquid and vapor-phase images were taken with 35mm still camera and CCD camera, respectively. Consequentially, it could be confirmed that the distribution of vapor concentration is more uniform in the case of the ambient gas with high viscosity than in that of the ambient gas with low viscosity.

• 한국자동차공학회논문집
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• 제19권6호
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• pp.107-112
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• 2011

FFV(Flexible Fuel Vehicle) is the vehicle that can be used liberally from gasoline to E100(Ethanol 100%) for fuel. Recently, interest in the bio-fuel is increased by the environmental factors like exhaustion of the fossil fuel and ruduction of greenhouse gases. For the reason, adopting of FFV is activated in the world including North and South America. In general, bio-ethanol has highly corrosive substance in compare with gasoline. In the part of fuel system, corrosion can make a safety problem in case of fuel leakage and engine starting problem. So the fuel system of FFV have to be made of high corrosion-resistant materials. This study examined the effect of bio-ethanol on the durability properties according to component materials in FFV fuel pump motor and regulator using the High Temperature Fuel Circulation Test.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2004년도 학술대회지
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• pp.234-238
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• 2004

Inconel 625 is useful in variety of industrial applications because of the resistance to attack in various corrosive media at temperatures from $200^{\circ}C$ to aver $1090^{\circ}C$, in combination with good law- and high temperature mechanical strength. Rencently, this material is also used widely in offshore processing piping in order to extend the maintenance term and improve the quality of anti-corrosion. In general, high quality weldments for this material are readily produced by commonly used processes. Not all processes are applicable to this material group, Ni-alloys. Metallurgical characterictics or the unavailability of matching, position or suitable welding processes. Nowadays, the flux cored wire is developed and applied for the better productivity in several welding position including the vertical position. in this study, the weldability and weldment characteristics (mechanical properties) of inconel 625 are considered in FCAW(Flux Core Arc Welding) associated with the several shielding gases($80\%Ar\;+\;20\%CO_2,\;50\%Ar+50CO_2,\;100CO_2$) in viewpoint of welding productivity.

• 한국해양공학회지
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• 제18권6호
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• pp.96-100
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• 2004

Inconel 625 is useful in a variety of industrial applications because of the resistance to attack in various corrosive media at temperatures from $200^{\circ}C$ to over $1090^{\circ}C$, in combination with good low and high temperature mechanical strength. Rencently this material has also been widely used in offshore processing piping in order to extend the maintenance term and improve the quality of anti-corrosion. In general, high quality weldings for this material are readily produced by commonly used processes. How, not all processes are applicable to this material group of Ni-alloys. Metallurgical or the unavailability of matching, position or suitable welding processes produce a lower quality. Nowadays, the flux cored wire is developed and applied for increased productivity in several welding positions, including the vertical position. In this study, the weldability and weldment characteristics(mechanical properties) of inconel 625 are considered in FCAW(Flux Core Arc Welding) associated with the several shielding gases$(80\%Ar+20\%CO2,\;50\%Ar+50CO2,\;100CO2)$ in view of welding productivity.

• 한국안전학회지
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• 제31권3호
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• pp.68-74
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• 2016

This paper presents a new strengthening method of underground box structures against seismic loads for anti-seismic capacity improvement. A threaded steel member with pressure devices(so called 'Pre-flexed member system') is used to improve seismic capacity of the RC box structure. The pre-flexed member system is fixed the corner of opening after chemical anchor was installed by drilling hole on the box structure. The structural performance was evaluated analytically. Two bracing types of strengthening methods were used; conventional bracing method and I-bracing pressure system. For the performance evaluation, seismic analyses were performed on moment and shear resisting structures with and without strength member system. Numerical results confirmed that the proposed pre-flexed member system can enhance the seismic capacity of the underground RC box structures.

• 한국게임학회 논문지
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• 제19권1호
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• pp.95-108
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• 2019

본 연구의 목적은 게임 중독을 개선하기 위한 게이미피케이션 개발 방법 방향 제언이다. 연구 진행을 위해 782개의 게이미피케이션 사례를 수집했다. 게이미피케이션 개발에 필요한 요소를 분석하기 위해 4F 프로세스를 기반으로 게임 메커닉스와 재미 경험을 분석했다. 분석한 사례를 기반으로 개발 요소 패턴을 분석하기 위해 아프리오리 알고리즘을 적용했다. 연구결과, 게임 메커닉스는 63개의 연관규칙이 발견됐다. 재미 경험은 37개의 연관규칙이 발견됐다. 본 연구 결과를 바탕으로 게임 중독 개선을 위한 게이미피케이션 개발 방향에 대해 제언한다.

• 항공우주시스템공학회지
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• 제17권1호
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• pp.97-105
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• 2023

항공용의 센서 포드는 비행체 기동조건에서 유도된 비행 하중에 대하여 정적 구조시험을 통한 구조 건전성을 검증해야 한다. 이를 위해 센서 포드 전 구조체의 정하중 시험장비 개발이 필수적으로 요구된다. 본 논문에서는 시험요구도를 기본으로 정적 구조시험의 구성 및 시험 구조물, 시험체 구속장치, 하중 인가장치, 제어 및 계측장비 등의 설계, 제작, 조립 및 검증에 대한 방법과 절차들을 확보하였다. 결론적으로 센서 포드의 정하중 시험 및 데이터 획득을 성공적으로 수행하였으며, 시험장비의 신뢰성도 함께 입증하였다.

• 한국화재소방학회논문지
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• 제26권5호
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• pp.79-84
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• 2012

상층 및 인접건물로의 연소확대 위험성이 있는 옥외 광고물 소재의 연소특성을 평가하였다. 본 연구에서는 UL 94와 ASTM D 2863에 따라 난연성과 한계산소지수를 평가하였다. 난연성 평가결과, 포멕스가 V-0의 높은 난연성을 보이는 반면 다른 시료들에서는 등급외의 난연성을 보였다. 한계산소지수 평가 결과에서도 포멕스의 한계산소지수가 가장 높았다. ISO 5660-1에 따라 콘칼로리미터를 이용하여 연소특성을 평가하였으며, 콘칼로리미터 시험결과 옥외 광고물 소재들은 화재확대 예방에 취약하다는 것을 알 수 있었다. 플렉스의 착화시간이 가장 빨랐으며, 특히 아크릴판은 최대 열방출율 뿐만 아니라 총 방출열량 또한 다른 소재들에 비해 높았다.