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Numerical analysis for the optimum condition of ultrasonic nebulizing
Kim, Jungsoon,Kim, Jihyang,Ha, Kanglyeol,Kim, Moojoon Institute of Pure and Applied Physics 2016 Japanese Journal of Applied Physics Vol.55 No.7
<P>To obtain the optimal driving conditions for ultrasonic nebulizing, the capillary wave caused by ultrasound on the water surface was analyzed theoretically. From the possible solutions of Mathieu's equation, the condition for amplitude diverging with time changes was investigated. The possible ranges of the driving frequency and the vibration displacement for nebulizing were obtained numerically, and the droplet size distribution was obtained in these ranges. The results of this study could be applied to design the desirable ultrasonic nebulizer. (C) 2016 The Japan Society of Applied Physics</P>
Kim, Jungsoon,Kim, Jihyang,Yeom, Jiyeong,Ha, Kanglyeol,Kim, Moojoon IOP Publishing 2017 Japanese journal of applied physics Vol.56 No.7
<P>In this study, a recollection method only for particles below a certain size involving ultrasonic atomization was suggested. Nanoparticles were separately recollected by using the suggested method with the suspension made of alumina powder of 300nm center diameter and the particle distributions in the recollected suspension were observed using an optical microscope. Furthermore, the size distribution of the recollected particles depending on the surface tension of the suspension was investigated. Results indicate that the sizes of the particles in the recollected suspension were reduced by decreasing the surface tension of the suspension. In the suggested method, the maximum diameter of the recollected nanoparticles could be controlled by changing the surface tension of the suspension. (C) 2017 The Japan Society of Applied Physics</P>
비만 관련 전문가들이 비만 치료시 느끼는 문제점에 대한 견해 조사
한정순(JungSoon Han),강재헌(JaeHeon Kang),김경아(KyungA Kim),김철환(CheolHwan Kim) 고려대학교 보건과학연구소 2005 보건과학논집 Vol.31 No.2
Bac㎏round : Obesity is correlated with chronic degenerative disease such as cardiovascular disease, hypertension, hyperlipidemia and diabetes etc. Although obese person should try to reduce their weight, they seem to have lack in recognition of obesity and of patience for weight control. Methods : Therefore, This study is about opinions of obesity treatment professionals including doctors, dietician, and sports prescription etc on proper obesity standards, causes for obesity, necessity of weight management, diseases resulting from obesity and methods to treat obesity, earned through research on problems in Korean obesity conducted to them. Results : 1. Professionals regarded waist circumstance as the most proper standard to determine obesity of Korean. 2. Professionals regarded deficient of exercise, rather than life style or intake of dietary fat food, as the biggest cause for obesity of Korean. 3. Professionals regarded necessity of weight management of Korean is to stay healthy. 4. Professionals regarded Diabetes as a disease that can be resulted from obesity of Korean. 5. Professionals said that their obesity patients preferred drug treatment most. 6. Professionals regarded lack of patients" willingness as the biggest reason of failure of obesity treatment. 7. Professionals regarded 69.4 ㎏, 176.3 ㎝(male) and 52.8 ㎏, 162.2 ㎝(female) as the most desirable weight and height.