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임지민(Ji Min Lim),이문석(Moon Seok Lee),이병혁(Byoung Hyuk Lee),이민섭(Min Sup Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The mechanism of a tire cavity noise in the sense of a tire source is introduced, and the transmission characteristic to a vehicle body is also examined to improve a cavity noise effectively. The multiple coherence analysis(MCA) to identify the contribution of a front and rear suspension roughly, and the transfer path analysis(TPA) to check a weak system is accomplished experimentally. The solutions for low cavity noise are drawn from technical analyses, and adopted to the medium size sedan for verification.
임지민(Ji Min Lim),이문석(Moon Seok Lee),백홍선(Hong Seon Beak),이민섭(Min Sup Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
A new method for analyzing the contributions of panels to a vibro-acoustic sensitivity is proposed and carried out by modifying a classical airborne source quantification method, and general NVH characteristics of a vehicle body are taken into account with the analysis results to explain the reasons of high level vibro-acoustic sensitivity. Total noise transfer mechanism from a driving point to a target point in a vehicle can be understood with a new method, and simple modifications are accomplished to verify the results.
황기 첨가 비율에 따른 황기주박 쿠키의 품질특성 및 항산화 활성
임지민,권혁진,용시은,최지호,이충환,김택중,박필상,최윤희,김은미,박신영,Lim, Ji-Min,Kwon, Hyuk-Jin,Yong, Si-Eun,Choi, Ji-Ho,Lee, Choong-Hwan,Kim, Tack-Joong,Park, Pil-Sang,Choi, Yoon-Hee,Kim, Eun-Mi,Park, Shin-Young 한국식품조리과학회 2013 한국식품조리과학회지 Vol.29 No.1
본 연구는 황기를 이용하여 만든 황기주 주박을 활용하고자 현대인들 입맛에 맞는 쿠키에 적용하였다. 황기 함량이 0, 0.5, 1%인 황기주 주박과 박력분을 2:8의 비율로 쿠키를 제조하여 품질특성 및 항산화 활성을 검토하였다. 황기주박을 첨가하여 제조한 쿠키의 밀도가 대조군에 비해 높았으며, pH는 황기의 첨가 비율이 증가할수록 다소 낮아지고 경도는 유의적으로 증가하였다. 쿠키의 퍼짐성, 손실율 및 팽창률에서는 유의성이 없었으나 주박 첨가 실험군에서 퍼짐성과 손실률이 낮아지고 팽창률이 증가하는 경향을 보였는데, 이는 부재료인 주박의 수분함량이 영향을 준 것으로 판단되며, 황기의 첨가량 증가에 따른 일정한 경향은 보이지 않았다. 쿠키의 색도에서 황기의 첨가량이 증가 할수록 L값이 유의적으로 감소한 반면 a값은 증가하였고, 관능적 특성에서는 황기 0.5%가 기호도면에서 가장 좋은 것으로 확인되었다. 항산화 활성 실험에서 폴리페놀 및 플라보노이드 성분 함량은 황기 첨가량이 증가될수록 높아지는 경향을 보였고 증류수 보다는 70% 에탄올 추출물에서 수율이 높게 나타났다. DPPH 전자공여능에서는 황기주박 1%첨가쿠키가 높은 항산화 활성을 나타냈다. 이런 결과로 가장 항산화 활성이 좋은 황기주박의 첨가 비율은 1%였으나 풍미가 중요한 쿠키의 특성상 항산화 활성도 뛰어나고 맛의 기호도가 가장 좋은 황기 0.5% 첨가 주박 쿠키가 적합한 것으로 판단되었다. In this study, rice wine cakes (Jubak) was produced using with Astragali memvranaceus with excellent antioxidant and antidiabetic effects and produced. This Jubak was applied to improve the cookies of modern taste and well-being products. The cookies according to the different ratio (added 0-1.0%) of Astragali memvranaceus and investigated the physicochemical characteristics, sensory evaluation, DPPH free radical scavenging activities, polyphenol and flavonoid contents. There were little changes in pH and density. The hardness of all treated cookies increased with Astragali memvranaceus Jubak(AJ) containing of different moisture contents. In color, L and a values of most cases increased in most of the treatments, but b value was reduced. In the sensory evaluation, the flavor and total scores showed the highest in 0.5% AJ cookies. But the higher proportion of AJ cookies that had unique flavors and tastes, so the total acceptance score decreased. The polyphenol and flavonoid contents increased in the higher proportion of AJ. In DPPH free radical scavenging activities, the control (no Jubak added) was 44%, and containing of 1% AJ cookies showed 82%. In conclusion, our study suggests that 0.5% in addition of AJ increased positive attributes and functional to cookies.
이문석(Moon Seok Lee),임지민(Ji Min Lim),이찬(Chan Lee),백홍선(Hong Sun Baik),황철하(Chulha Hwang) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.10
A CTBA(Coupled Torsion Beam Axle) is a general type for rear suspension of small/compact sedans. It connects left and right knuckles using torsion beam axle and trails rear wheels . Therefore, a CTBA performs a main role of ride & handing. But, a CTBA suspension has main bending mode around 120Hz and causes road booming noise in the interior of a car. Therefore, the mode control of a CTBA is very important for reducing road noise. In this paper, we optimized the shape of a CTBA to reduce road noise considering R&H performance, simultaneously. The vibration mechanism of CTBA was investigated using ODS(Operational Deflection Shape) and mode shape.