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CAM 곡선 개선에 의한 차량용 공조기의 소음 저감 평가
정재은(Jeong, J.E.),정창용(Jung, C.Y.),서범준(Seo, B.J.),정운창(Jeong, U.C.),오재응(Oh, J.E.) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.9
The noise in a vehicle is an important factor for customers purchasing a car. Particularly, reduction of the noise that is generated from HVAC(heating, ventilation and air conditioning) is very important since it has considerable effects on interior noise. In general, identification of noise source is crucial to reduce noise level. The complex acoustic intensity method is widely used to obtain the accurate measurement and identification of noise source. Therefore, in the previous study, noise source of HVAC was identified through experimental approach using the complex acoustic intensity method. In this study, we are intended to confirm reduced level of noise by comparing the result between before and after modification of cam curve that is based on identified noise source of HVAC. It is found out that noise source of HVAC are motor and cam area using the complex acoustic intensity method in the previous study. We performed experiments to compare noise level between before and after modification of cam curve. Especially, it can be seen that complex acoustic intensity method using both active and reactive intensity is vital in devising a strategy for comparison to noise level. Also, the vector flow of acoustic intensity was investigated to identify sound intensity distributions and energy flow in the near field of HVAC.
액정표시 소자용 고분자 / 액정 복합막의 전기광학 특성 개선
노창호,성준호,정재은,박관선,사공동식 ( C . H . Noh,J . H . Sung,J . E . Jung,K . S . Parl,D . S . Sakong ) 한국공업화학회 1995 공업화학 Vol.6 No.5
할로겐계 액정화합물과 광경화성 수지 화합물을 사용하여 액정/고분자 복합막 재료의 구동 전압, 응답 속도, 콘트라스트 비등의 구동 특성을 향상시켰다. 액정/고분자 복합막의 전기광학적 성질은 사용한 재료의 조성, 제조 온도 등의 제조 환경에 따라 상당한 영향을 받으며, 제조 조건의 최적화에 따라 전기 광학적 성질 및 신뢰성을 크게 향상시킬 수 있었다. 액정/고분자 복합막 재료의 전기 광학적 특성이 크게 개선됨에 따라 TFT 소자 등의 액티브 매트릭스 구동에 의한 고휘도, 대화면의 표시가 가능한 액정 프로젝터의 실용화에 보다 접근할 수 있게 되었다. Polymer Dispersed Liquid Crystal(PDLC) materials of low saturation voltage and high contrast ratio have been developed by using halogenated liquid crystals and photo-reactive acryl resin system. The other reliabilities such as hysteresis, temperature dependence and UV-stability of its electro-optical properties have been improved by optimising LCPC structure and synthetic conditions. Active-matrix addressed LCPC device having such a good electro-optical properties promises higher brightness and larger screen size for projection display.