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철도소음예측시 입력변수의 영향을 고려한 소음지도 작성 및 평가
이재원(Lee, Jaewon),구진회(Gu, J.H.),이우석(Lee, W.S.),서충열(Seo, C.Y.) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.4
The noise map can be applied to predict the effect of noise and establish the noise reduction measure. But the predicted value in the noise map can vary depending on the input variables. Thus, we surveyed the several prediction models and analyzed the changes corresponding to the variables for obtaining the coherency and accuracy of prediction results. As a result, we know that the Schall03 and CRN model can be applied to predict the railway noise in Korea and the correction value, such as bridges correction, multiple reflection correction, curve correction must be used for reflecting the condition of the prediction site. Also, we know that the prediction guideline is an essential prerequisite in order to obtain the unified and accurate predicted value for railway noise.
[論文] 자동차 방향지시등 렌즈설계를 위한 CAD 시스템의 개발에 관한 연구
이재원(J. W. Lee),이우용(W. Y. Lee) 한국자동차공학회 1993 오토저널 Vol.15 No.3
This paper presents the development of CAD system for the design of lens of the Turn Signal Lamp that can model and simulate its optical performance. The system consists of three main modules: skin surface modeling module. inner lens modeling module and optical performance simulation module.<br/> Skin surface geometry can be modeled by the input of data file and inner lens can be modeled by the input of only four parameter using its geometric characteristics. Also light distribution pattern, the barometer of optical performance, is generated by means of finite ray tracing method.<br/> The system display modeled geometry, ray tracing and generated light distribution pattern.