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Evaluation of quality index of salted Korean cabbage in the short-term distribution system
정영배,송혜연,박상언,천호현,한응수,정영배 한국식품저장유통학회 2017 한국식품저장유통학회지 Vol.24 No.1
The aim of this study was to provide the quality index of salted Korean cabbage in a short-term distribution system. Salted Korean cabbages were packaged with or without 2% salt water, and then distributed in a conventional system (CVS) and a cold-chain system (CCS) for 6 h. The material temperature of samples with and without salt water gradually increased to 19.57℃ and 19.43℃ in a CVS, respectively and to 10.73℃ and 12.90℃ in a CCS, respectively. Salinity of the materials in a CCS did not change, whereas salinities of the materials in a CVS were 1.2 and 1.7 fold higher, respectively. Also, a slight increase in acidity was observed in both packaging materials in a CCS. In the case of a CVS, total aerobic bacteria and lactic acid bacteria increased to 7.62 log CFU/g and 6.77 log CFU/g in the materials with salt water, respectively, whereas the number of total aerobic bacteria and lactic acid bacteria ranged between 5.62-5.85 log CFU/g and 4.33-4.83 log CFU/g in the materials without salt water, respectively. However, significant microbial changes were not observed in a CCS as distribution time increased. CCS with salt water packaging was effective in achieving microbial control and maintaining physicochemical quality. Salinity, aerobic bacteria, and lactic acid bacteria can be useful as quality indices for a CVS, and acidity can be useful as quality index for a CCS.
CFD에 의한 건물 외피 풍압분포에 관한 수치적 예측과 적용에 관한 연구
정영배,하영철 한국풍공학회 2008 한국풍공학회지 Vol.12 No.2
The simulation for wind pressure coefficients using CFD was carried out as a useful tool. According to present project, this paper presents the results of application and numerical prediction of wind pressure distribution and coefficient over building cladding. The analysis of wind pressure assessment due to wind-resistant design and wind effect to surrounding buildings is important to building cladding. This paper simulates the wind pressure distribution to the building and wind flow pattern around the building cladding, and shows the usability of CFD analysis to design process of building. A Navier-Stokes-Solver with Quick spatial discretization scheme and RNG k- turbulence model has been applied to the computation of the three dimensional turbulent flow.
초고층 건물의 각주형 단면에 대한 공력 불안정 진동 및 풍진 저감 효과에 관한 실험적 연구
정영배,Cheong, Yung-Bea 한국강구조학회 2001 韓國鋼構造學會 論文集 Vol.13 No.3
For a rectangular-highrise building with aspect ratio about six, the resonant wind speed of wind-induced vibration or galloping start wing speed can be within the design wind speed. The wind-induced vibration and galloping of highrise building with aspect ratio $H/\sqrt{DB}=6$, side ratio D/B=1 to 2 at intervals of 1/4 D/B were investigated in smooth flow. For the reducing effect of wind-induced vibration of highrise building, rectangular-highrise building with corners cutting about side ratio D/B=2 were investigated. Experimental results show that in the smooth flow non corners-cutting cases have tendency of increasing wind-induced vibration and galloping vibration then corner-cutting section. Therefore, the wind-induced vibrations on rectangular-highrise buildings were reduced effectively by using corner cut method. 내풍설계에 있어서, 아스펙트비가 6정도인 초고층 건물의 각주형 단면의 바람에 의한 공력 불안정 진동 또는 갤로핑 진동이 발생할 수 있다. 본 연구에서는 등류에서 아스펙트비 6정도이고 변장비가 1/4간격으로 1에서 2까지의 초고층 건물의 각주형 단면에대한 공력불안정 진동과 갤로핑 진동에 대해 실험적으로 고찰하였다. 실험 결과, 등류시 코너 컷이 없는 경우가 코너 컷을 가진 초고층 건물의 각주형 단면에 비해 공력 불안정 진동이 커지는 경향이 있으며, 또한 갤로핑 진동도 나타났다. 따라서, 코너 컷에 의해 각주형 초고층 건물에서의 공력 불안정 진동은 효과적으로 저감되었다.