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- 저자 : 박재상 (검색결과 374 건)
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박재상 한국항공우주학회 2018 International Journal of Aeronautical and Space Sc Vol.19 No.4
Rotor load predictions of the UH-60A helicopter in low-speed flights are validated using nonlinear flexible multibody dynamic analyses with multiple wake panels. A nonlinear flexible multibody dynamic analysis code, DYMORE II, is used for predicting the blade section airloads and structural loads of the UH-60A rotor in low-speed forward and descending flights at the advance ratio of 0.15. The freewake model with multiple wake panels is integrated implicitly into DYMORE II to represent effectively the BVI (blade–vortex interaction) phenomenon of the rotor in low-speed flights. For both low-speed forward and descending flights, the multiple wake panel and single wake panel models both validate the blade section normal forces (or lift forces) moderately or well with the flight test data; however, they predict the blade section pitching moments moderately or poorly. For blade structural loads, two analyses using the multiple wake panel and single wake panel models validate the oscillatory flap bending moments moderately for both flight conditions; however, they correlate the oscillatory lead–lag bending moments poorly with the measured data. In addition, the multiple wake panel and single wake panel models both validate the oscillatory torsion moment well for the low-speed descending flight; but they predict it moderately or poorly for the low-speed forward flight. Through the present study, the analyses using multiple wake panels show better predictions of the rotor loads in low-speed flights as compared to the results with a single wake panel, along with efficient and reasonable computation resource and time.
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한방 다이어트 식품 HBM(Healthy Body Maker)의 체중감소 및 혈청 콜레스테롤 저하 효과
박재상,김애정,김선여 동아시아식생활학회 2001 동아시아식생활학회지 Vol.11 No.4
This study was performed to investigate the effects of HBM(Healthy Body Maker) on the weight loss and serum cholesterol level of rats. Twenty male Sprague-Dawley rats weighing 200±5g were grouped into 2. Rats were raised for 6 weeks with diet containing 0% and 5% of HBM. 1. There were no clinical signs for all the experimental period(6 weeks) in 0% and 5% groups. 2. At 3 and 6 weeks, body weight of 5% HBM group was significantly lower than that of control group. respectively (p<0.05, p<0.01). 3. At 4 weeks, the level of MCHC of 5% HBM group was significantly higher than that of control group(p<0.01). And at 6 weeks the level of RBC and Hct of 5% HBM group were significantly higher than those of control group(p<0.05). 4. At 6 weeks, the level of serum cholesterol of 5% HBM group was significantly lower than that of control group. 5. Absolute liver weight of 5% HBM group was significantly lower than that of control group(p<0.05). 6. Minor subaceous sickness of liver cell in the control group appeared but no symptom of liver cell in 5% HBM group, It is concluded that HBM was a safe and effective diet food which aided in inducing weight loss in rat without any observed harmful clinical side effects.
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고체상미량분석법(SPME-GC/FID)에서 실험계획법을 이용한 디젤첨가제 미량분석의 최적화 연구
박재상,장순웅,Park, Jae-Sang,Chang, Soon-Woong 한국지하수토양환경학회 2007 지하수토양환경 Vol.12 No.5
In this study, the experiment of solid-phase microextraction (SPME) technique using GC/FID was conducted as a possible alternative to liquid-liquid extraction for the analysis of EGBE, DGBE, DBM and TGME in water, and also, an optimization condition of trace analysis for disel oxygenates including EGBE by the design of experiment (DOE) was described. Experiments used a fractional factorial design method followed by central composite design allowing optimization of a number of factors as well as statistical analysis of the results. The response surface analysis showed that the extraction efficiency could be represented by a second-order polynomial equation in which the salts concentration, extraction temperature, extraction time and sonication time are the major influences. Using DOE method, a new datadependent method was developed to improve the quantity of confidently analyzed disel oxygenates in water samples.
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