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Lactobacillus casei YIT 9018 에 의한 Aloe vera 첨가 액상 발효유의 성상
이재환,윤영호 ( J . H . Lee,Y . H . Yoon ) 한국축산학회 1997 한국축산학회지 Vol.39 No.1
Parameters involved with addition of aloe very on liquid yoghurt fermentation were investigated in order to fortify the probiotic properties of the fermented milk. The following results were obtained; The maximum level of aloe very juice addition turned out to be 20% of skim milk substrate, acid production rate of Lactobacillus casei YIT 9018 increased by the addition of aloe vera juice into skim milk. L. casei viable cells of log 9.63 cfu/㎖ sustained in 20% aloe vera juice supplemented substrate and log 9.23 cfu/㎖ in control. The organic acid content analysis of the fermented milk by HPLC revealed that 1,133 ppm of lactic acid and 126 ppm of acetic acid in L. casei culture. There was no significant difference in organic acid content due to the aloe vera juice supplementation. The adverse effects in pH, titratable acidity, viscosity, precipitation and viable counts during 5 days storage in refrigerator were not observed in the aloe very supplemented liquid fermented milk. Panel test results of aloe vera juice supplemented liquid fermented milk showed that palatability score of 6.25, which was not statistically significant to 6.95 of the control.
오리피스 구조내에서 발생한 공동소음의 음향학적 스케일링에 관한 연구
이재환(J. H. Lee),이승배(S. Lee),유선학(S. H. Yoo) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
The major source of noise in the process of transporting liquids is related to the cavitation phenomenon. The control valve noise is mostly dominated by bubble dynamics under cavitating conditions. In this investigation, an orifice configuration is set-up to correlate its flow-field and acoustic signatures with those from a control valve device. The performance and noise characteristics form the orifice configuration in anechoic surroundings were measured to reveal the noise sources depending on pressure differences across the orifice configuration. The sound powers from the orifice configuration are effectively normalized using proposed scaling parameters. Flow-excited dynamic systems for which there is no strong coupling between the flow and the system response can be described using a linear source-filter model. On this assumption, the normalized sound powers can be decomposed of noise source function and a response function. To find noise sources, pressure spectra measured over a range of pressure differences are transformed into the product of two non-dimensional frequency function : Pss(He,fca,x/D) = F(fca) G(He,x/D). This scheme of finding noise sources is shown to be applicable to the cavitation noise from the control valve effectively. Two kinds of cavitating modes based on our experimental data are found and discussed.