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최인수,현창택,홍태훈,김윤식,Choi, In-Su,Hyun, Chang-Taek,Hong, Tae-Hoon,Kim, Yun-Sik 한국건설관리학회 2009 건설관리 : 한국건설관리학회 학회지 Vol.4 No.1
최근 국내 VE에 관한 이슈가 대두되고 있으며, 이에 따른 연구가 활발히 진행되고 있다. 하지만 기능분석 및 VE분석절차에 관한 연구에 머물러 있을 뿐이고, 합리적인 제안 채택을 위한 연구는 미흡한 실정이다. 이에 본 연구에서는 특히 발주자의 입장에서 실행단계 업무처리와 VE활성화에 일조할 수 있도록, VE프로세스에서 제안채택 여부를 결정하는 최종단계의 평가 절차와 기준에 관한 체계적인 방안을 제인하고자 한다. 우선, 국내외 문헌고찰 및 설문조사를 통하여 문제점을 파악하고 개선방향을 도출한다. 이어서 제안채택 여부 결정을 위한 세부절차를 설정하고 표준평가쉬트를 제안하였다. 마지막으로, 본 논문은 프로젝트의 성격에 따라 발주자 측에서 적절히 조정하여 적용한다면 VE관리업무에 효율적으로 활용될 수 있을 것으로 기대된다. The role and importance of VE have been enlarged since VE application was mandatory by law in public sector in March, 2000. Public organizations have widened the technological horizon through VE competitions and applied VE technique to private investment projects. Many studies have been carried out on function analysis and VE procedure. In practice it is common that clients make a decision one-sidedly on whether or not VE proposals are selected. The VE procedure itself is not smooth. This study gives some suggestions on VE appraisal procedure and criteria at the last phase on VE process in order to smooth the progress of VE. The results of this study can be used as a tool to improve efficiency in the management of VE.
전기집진기와 사이클론을 응용한 디젤 입자상 물질의 후처리장치 기초연구
최인수(In-Su Choi) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.6
An aftertreament system or diesel exhaust gas was attempted to extract particulate matters. The system consisted of a corona-less electrostatic precipitator to agglomerate soot particles and a counter-flow cyclone to collect them. When the effect of high voltage was examined at different configuration of electrode plates, the case of positive 1kV at both plates showed the maximum reduction of 38% in diesel smoke level. However, the back pressure became quite high as engine speed increased, so that minimizing pressure drop in cyclone should be studied with improving collection efficiency of soot particles.<br/>
가열 수직 평판과 마주보는 전자모듈의 복사 및 대류 냉각에 대한 실험적 고찰
최인수 ( In-su Choi ) 한국산업융합학회 2005 한국산업융합학회 논문집 Vol.8 No.2
The characteristics of natural convection heat transfer combined with radiation in a vertical parallel plates has been investigated experimentally. The vertical channel is consisted with a heated wall and three protruding heating sources attached on the opposite wall. The cooling of modules has been experimented with heating the wall as well as modules themselves at different aspects ratios and heating fluxes. As the location of module is higher, the temperature becomes higher, but the increasement is smaller. When the aspect ratio is lower than 26, its effect on the temperature is not significant rather than that of the radiation heat transfer. Furthermore, the correlation of Nusselt number with the Rayleigh number are attempted, but additional treatment is needed to accomodate the cases of heating module and/or opposite wall.
제한벽이 있는 공기제트에 의한 돌출 발열체의 냉각 특성에 대한 수치 해석 연구
최인수(In-Su Choi) 한국산업융합학회 2009 한국산업융합학회 논문집 Vol.12 No.1
The air flow and heat transfer characteristics of an air jet impinging on a pedestal heat source has been investigated numerically to examine the effects of geometric parameters such as nozzle-to-pedestal spacing, nozzle diameter and pedestal size. Also, the parameters of Reynolds number, air jet power, supplied heat and thermal conductivity of pedestal have been studied to reveal how these affect the average Nusselt number. Hence, a two-dimensional turbulent model has been developed and adopted to simulate the fluid flow and heat transfer phenomena numerically. The results obtained from the model show that the nozzle-to-pedestal spacing, relative size of nozzle to pedestal and Reynolds number of air jet have a significant influence on the cooling characteristics of heated pedestal. Furthermore, some useful guidelines could be given to the application of cooling the heated pedestal.
디젤연소용기에 직접분사된 천연가스와 파일럿오일의 복합연소 모델링
최인수(In-Su Choi) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
Dual-fuel engines are being researched with emphasis on the possible types of natural gas supply systems. Hence, a three-dimensional combustion model by using finite volume method was developed to provide a fundamental understanding of the auto-ignition of pilot distillate and subsequent burning of natural gas, when the natural gas as well as the distillate was directly injected into a quiescent diesel engine like combustion bomb. The computer model was calibrated by comparing with the experinEntal results and the numerical results sere investtigated for the mixed combustion phenomena.<br/> With high-pressure natural gas injection, it was found that the gaseous fuel injection characteristics had to be well harmonized with that of the pilot distillate. For better combustion efficiency, however, further researches are required for the optimisation of injection system in the existance of air motion.<br/>
밀폐공간에 놓인 전자 칩의 열발산에 복사 열전달이 미치는 영향
최인수(In-Su Choi) 한국산업융합학회 2009 한국산업융합학회 논문집 Vol.12 No.4
Electronic components in an enclosure have been investigated to prevent undesired thermal problems. The electronic devices, such as ECUs of automotive engines, are operated under the contaminated environments, so that they rely on the passive cooling without any fluid-driving methods. Therefore the radiation heat dissipation plays more important role than the conduction and convection heat transfer. Hence their combined heat dissipation phenomena have been simulated by a numerical model to reveal the effects of supplied heat flux, emissivity of material, geometry of enclosure, charging gas and pressure. The result showed that the radiation had a significant effect on the heat dissipation of module in an enclosure, and some space above the module should be reserved to prevent its thermal problem. In addition, the higher thermal conductivity and pressure of gas in an enclosure could be necessary to improve the thermal dissipation from the electronic devices.
System Dynamics를 활용한 기본소득의 지역 영향성에 대한 연구: 보편적 현금급여와 현물에너지급여의 비교를 중심으로
최인수 ( In Su Choi ) 한국시스템다이내믹스학회 2014 한국시스템다이내믹스 연구 Vol.15 No.2
Over the past few years Korea has achieved rapid economic growth, while the deepening polarization of income has negatively affected Korea economy and society. It can be the reason of this negative effect on economy that the increased income by the economic growth has not been distributed socially, but overly focused on one part of social class. One of the important and powerful solution of social polarization could be the strengthening of the income distribution. In these circumstances, the social interest and discussion on the universal welfare system and on the basic income as the means of income redistribution have been increasing. In this study, a system dynamic analysis was conducted to find how an universal cash payment as basic income providing cash benefits impacts on the promotion of consumption in private sector, of local jobs and of local economic organizations. Recently, the poor energy consumption ability of energy poverty became one of the social problems. Also it was analysed how an energy payment-in-kind as basic income influences on the energy consumption of the region, the energy production capacity, the promotion of local energy. The universal cash payment and energy payment-in-kind as the basic income policy showed similar and positive effects on the local economy system and on the local energy system respectively.