• 한국자동차공학회논문집
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• 제17권3호
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• pp.8-14
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• 2009

Effect of heterogeneity of combustion chamber has been thought as one of the way to avoid dramatically generating heat in HCCI Combustion. The purpose of this research is to investigate the effect of heterogeneity, especially thermal stratification and fuel strength stratification on HCCI Combustion fueled with DME and n-Butane. Thermal stratification is formed in Combustion Chamber of Rapid Compression Machine with 3 Kinds of pre-mixture has different properties. The stratified charge mixture is adiabatic compressed and on that process, in cylinder gas pressure and two-dimensional chemiluminescence images are measured and analyzed.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2010년도 춘계학술대회
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• pp.81-95
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• 2010

Gas turbines generating power operate in high temperature condition and use natural gas as fuel. For that reason, there are many cases where damage is done to the hot gas parts caused by the high temperature and many accidents occur like gas explosions, then various efforts are needed to maintain the hot gas parts and prevent accidents. It is difficult to find the root causes of damage to the hot gas parts from the gas explosion caused by gas leakage through rotor cooling air line from fuel gas heat exchanger during the shut down. To prevent gas turbine from damage, removal of gas leakage inside of gas turbine is required by purging the turbine before firing, improving the fuel gas heating system and installing alarm systems for detecting gas leakage from stop valve to turbine while the gas turbine has shut down.

• 대한안전경영과학회지
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• 제12권2호
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• pp.75-82
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• 2010

Gas turbines for power generating operate in a very high temperature condition and use natural gas for fuel. For this reason, many cases of damage happen at hot gas parts which are severely affected by high temperature gas and many cases of explosion occur by fuel gas. So a lot of efforts should be made to prevent hot gas parts damage and gas explosion accidents. Though there are many damage cases and explosion accidents, it is very difficult to find out the root causes of hot gas parts damage caused by gas explosion due to gas leakage in the heat exchanger for air cooling and gas heating. To prevent gas turbine from damage caused by gas explosion, removal of leakage gas from gas turbine is inevitably required before firing the gas turbine and installing alarm systems is also required for detecting gas leakage at stop valve to turbine while shut down.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.227-228
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• 2017

In this study, the inductor heating which is confined to the metal processing is used by demolition technology in reinforced concrete. And, the purpose is the verification of realization for this technology. Using the inductor heating device, the temperature rising is measured depending on the difference of the generating capacity. And, the demolition of reinforced concrete is evaluated by the vulnerability of concrete due to the inductor heating of rebar in reinforced concrete.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1220-1221
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• 2007

Building-integrated photovoltaic(BIPV) perform traditional architectural function of walls and roof while also generating electricity. But most of the absorbed solar energy appears passively as heat, raising the temperature of cells and reducing the efficiency with which the active part is converted into electricity. Therefore this paper presents the comparison of electrical, architectural and thermal performance of roof integrated photovoltaic(PV) modules, which is composed of different hybrid structure layer such as urethane form, waffle stud etc.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 하계학술대회 논문집
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• pp.448-451
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• 2000

The purpose of this study is to manufacture and test a thermoelectric generator which converts unused energy from close-at-hand sources, such as garbage incineration heat and industrial exhaust, to electricity. A manufacturing process and the properties of a thermoelectric generator are discussed before simulating the thermal stress and thermal properties of a thermoelectric module located between an aluminum tube and alumina plate. We can design the thermoelectric modules having the good properties of thermoelectric generation. Resistivity of thermoelectric module for thermoelectric generation consisting of 62 cells was 0.15-0.4$\Omega$ Developed thermoelectric modules can be expected th have better properties than thermoelectric cooling modules above $70^{\circ}C$ in temperature difference between hot and cold ends.

• 한국전기전자재료학회논문지
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• 제27권12호
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• pp.776-791
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• 2014

A marvellous solar cell technology system based on organometal halide perovskites has recently shown an unprecedented progress in power conversion efficiency (PCE); the certified one of 17.9% and unconfirmed of 19.3%, as well as the estimated electricity with a generating cost lower than the half of conventional methods based on fossil fuels. In this report the present status of stability with regards to moisture, ambient temperature, ultraviolet and lead toxicity as well as the key technological developments for the early commercialization are covered. Comprehensive understanding of material science for perovskites is required, together with complete encapsulation technologies beyond those for OLEDs, in order to ensure a 20-year-longer-than lifetime of PSCs (perovskite solar cells) and the stability according to the IEC 61646 damp heat test standard, which will result in the replacement of silicon solar cells with PSCs.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1997년도 춘계학술발표회논문집(2)
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• pp.427-432
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• 1997

Boron neutron capture therapy(BNCT) is a binary treatment modality that can selectively irradiate tumor tissue. More is known now about the radiation biology of BNCT, which has reemerged as a potentially useful method for preferential irradiation of tumors. We design a square reactor (that can easily be reconfigured into polygonal reactors as the need arises) with four slab type assemblies to produce high quality epithermal neutron beans and thermal neutron beams jot use in neutron capture therapy. With a low operating power of 300kW, the heat generated in the core can be removed by natural convection through a pool of tight water. The proposed design in this study could be constructed for a dedicated clinical BNCT facility that would operate very safely.

• 한국건축시공학회지
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• 제16권1호
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• pp.1-7
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• 2016

본 연구에서는 $-5^{\circ}C$이하에서도 가열 양생이 없이 수화 반응시 수화열이 높게 발생되는 환원슬래그를 시멘트 분체와 치환사용 하여 영하의 온도에서도 콘크리트의 자체 발열로 인해 압축강도를 재령 3일 이내 5MPa를 발현시켜 초기동해를 방지시키는 것이 최종 연구의 목적이며 이에 대하여 환원슬래그의 물리적 특성 평가와 열적 특성 평가를 실시한 결과 환원슬래그는 높은 수화열을 발생시키기 때문에 저온에서도 압축강도 발현이 우수함을 알 수 있었다. 이는 환원 슬래그의 성분 중 $C_{12}A_7$과 $C_3A$에 의해 수화열이 높게 발생됨 저온에서도 압축강도가 발현되는 것으로 나타났다. 하지만 환원슬래그 단독 치환하였을 경우 $SO_3$함량 부족으로 급결이 발생하는 것을 알 수 있었다. 급결을 방지하기 위해서는 석고의 사용이 필수적으로 사용되어야 한다. 따라서 본 연구 결과 환원슬래그와 석고를 3성분계로 사용하였을 경우 저온에서도 재령 3일에서 5MPa 압축강도를 나타나는 것으로 보아 저온에서도 콘크리트의 초기동해를 방지할 수 있을 것으로 판단된다.

• 한국가스학회지
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• 제2권4호
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• pp.60-66
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• 1998

열 풍로 공정은 고로 공정에 필요한 고온의 일정량의 공기를 연속적으로 생산하는 공정이다. 제철소 내에서 발생되는 부생가스를 연료로 사용하는 열 풍로 공정은 제선 공정 전체 에너지의 약 $20\%$를 소비하여 대표적인 에너지 소비 공정으로 인식되어 왔다. 그러므로, 열 풍로 열 효율 향상을 통한 에너지 절감 노력이 해석적인 방법과 실험적인 방법을 통해 지속적으로 이루어져 왔다. 조업 중 발생되는 열 전달 현상의 복잡성 그리고 조업 조건 변동에 따른 모델 내 Parameters들의 변화로 인하여 해석적인 방법을 통한 정확한 모델 구축에 많은 어려움을 겪어 왔다. 본 연구에서는 컴퓨터의 발전과 더불어 발전되어온 실험적 모델 중 하나인 신경회로망을 이용, 조업 변수들과 열 효율과의 관계를 나타내는 모델을 구축하고자 한다. 또한 기존 신경 회로망을 이용할 경우, 모델의 성능을 저하시키는 Over-parameterization의 문제점을 극복하기 위하여, 고차원의 조업 데이터를 Walsh-Hadamard 변환을 이용하여 저 차원으로 투영하여 조업 데이터의 특성을 추출, 이를 이용한 열 풍로 열 효율 예측을 위한 신경회로망 모델을 구축하였다. 본 연구를 통하여, 조업 변수들과 열 효율간의 관계를 나타내는 모델을 구축, 열 효율 예측결과를 나타냈으며, 모델의 예측 성능을 평가하기 위하여 다변량 통계적 방법인 Partial Least Square (PLS) 방법과 비교하였다.