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MLP 분류기로 패턴 분류를 위한 가중치 모멘트 특징 추출
강형구(Kang H. G),박용희(Park Y. H),진영근(Jin Y. G),김경옥(Kim G. O),이진학(Lee J. H),김태균(Kim T. G) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.2A
본 논문에서는 MLP(Multi-Layer Perceptron) 분류기의 입력으로 사용될 가중치 모멘트량을 계산하는 방법을 제안한다. 모멘트는 물체를 표현하는데 회전, 크기, 이동 등에 불변하는 특성을 갖고 있지만, 부정확한 영역 분할로 인한 영역 경계면의 변화에 따른 잡음에 민감하게 반응하여 실제 응용에서는 사용하는데 난점이 있고 zernike 와 같은 모멘트는 정확도는 있지만 계산이 복잡하고 시간이 오래 걸린다는 단점이 있다. 이에 비교적 계산이 간단한 기존의 모멘트 계산 방법을 개선하는 측면에서 가중치를 적용하는 모멘트 계산 방법을 제안한다. 실험 데이타로 10개의 비행기 모형을 사용하였으며, 성능 비교를 위한 분류기로 본 논문에서는 MLP 를 이용하였다. 실험 결과 제안한 가중치를 적용한 모멘트가 기존의 정규 모멘트(Regular Moment)보다 우수함을 보이고 있다.
냉연재 권취공정의 메커니즘 규명 및 유한요소해석 모델 개발
박규태(K.T.Park),박용희(Y.H.Park),김경석(K.S.Kim),원성연(S.Y.Won),홍완기(W.K.Hong),천명식(M.S. Chun),박현철(H.C.Park) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In the thin strip coiling process, it is necessary to use the sleeve with mandrel to prevent the excessive deformation of the strip. And stress distribution in the sleeve and strip is important factor to determine the size of sleeve. However, experimental approach is almost impossible because of accumulation of high pressure. In this study, the finite element model for the strip coiling process was developed. Also, the radial and hoop stress on the sleeve and strip were investigated. Theoretical values and analysis result in an idealized conditions were compared for verification of the finite element model. Using the FE analysis, effects of strip thickness on the stress distribution and stress concentration was investigated. The result shows the radial stress increased by 6.3 times near the coil starting point. The radial stress increased by 3.2㎫ compared to previous model with the stacked thickness of 90 mm that corresponds to weight of 2959 layers of 1 mm thickness strip.
김종춘(J.C. Kim),엄명도(M.D Eom),박용희(Y.H Park),이종태(J.T Lee),이상문(S.M Lee),신용호(Y.H. Shin) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
At this study. the research showed the compared analysis results for the limited regulation of emission gas CO. HC. Nox. Also. it classified by combustion system. displacement. odometer and before-after of maintenance among 47 vehicles of 50250cc 5 fleets which made in Korea. 55 vehicles of 400-1800cc 7 fleets which imported. It is 102 vehicles of 12 fleets in total. Regarding some vehicles below 50cc. We compared the difference of emission gas and visible colors according to various engine oils.<br/> The test methods of emission gas are as follows.<br/> The vehicles of below 50cc is tested by ECE-47 mode. And the others is tests by ECE-40 mode.<br/>
김종춘(J.C.Kim),정일록(I.R.Jung),박용희(Y.H.Park),황순홍(S.H.Hwang) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
In this study, In-use vehicle emission were investigated/compared in operating conditions for gasoline and LPG vehicles produced during 1988-1995. The following conclusions could be drawn from the study.<br/> 1. Non-load operating condition and load condition were carried out for 153 in-use gasoline as well as LPG vehicles. The exhaust emission of HC and CO in non-load operating condition was two times higher than load operating condition, but the emission of NOX was 87.0 % higher in the load operating condition.<br/> 2. The load operating condition, which is similar to practical operating condition, turned out to be more appropriate for the measurement of NOX emission. A lot of research for reducing NOx measures are proceeding in developed country because vehicle which exhaust gas purification system burn downed, exhaust a lot of NOx in this case Therefor our country should be established by the law for reducing NOx anf develop the operating procedures and test limit.<br/> 3. The one of test procedure is applicable of exhaust emission test procedure for loaded operating because 50% loaded 25mile speed's operating condition and 25% loaded 15 mile speed's has similar to the results of exhaust emission and is forecasted same exhaust emission reduction.<br/>
LPG자동차의 연료성분에 따른 오염물질 배출특성에 관한 연구
김종춘(J.C Kim),엄명도(M.D Eom),박용희(Y.H Park),이종태(J.T Lee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
A Study of Exhaust Emission Characteristics Depending On Fuel Contents of LPG Vehicles. <br/> Diesel engine vehicles emitting the particulate matters (PM) and Nitrogen Oxides (NOx) into the air take 29% of the whole car population in Korea, which is higher than that of the advanced countries.<br/> Therefore, the government is encouraging to use LPG fueled vehicles in place of diesel fueled vehicles, and the number of LPG vehicles is increasing.<br/> The LPG having less carbons in molecular structure compared with gasoline is evaluated as clean fuel as it creates less hydrocarbon (HC) and carbon dioxide (CO2), and less PM and NOx.<br/> However, the current fuel supply system of an LPG engine supplying the fuel into an engine is of a mixer type by which fuel is supplied in a gas state, and the air-fuel ratio is not controlled as precise as the liquid injection type used in a gasoline engine, and it results in more emissions as the engine ages due to varying air-fuel ratio.<br/> Therefore, it is inevitable to develop a technology enabling a liquid injection of LPG to achieve low emission of LPG vehicles. LPG is a mixture of butane and propane which have different number of carbon and hydrogen, and it causes difficulty in starting a cold engine in winter affecting emissions as well.<br/> Therefore, by changing the contents butane and propane of LPG and by measuring and analyzing the emission in different driving modes, the study is focused on finding a fuel suitable for an LPLi system to be developed in the future.<br/> As a result, it was learned that the emission is dependent on the fuel content, i.e. higher rate of propane causes less emission in general.