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Effect of Particle Size on Zirconia Gel-Casting Process
김인웅,이상진 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.6
The fabrication process of zirconia gel-casting was studied to obtain a dense zirconia on a large-scale or with complicated shapes. As an experimental parameter, two different particle sizes (0.1 ㎛ and 0.7 ㎛) of zirconia powder were applied to the gel-casting process. The viscosity behavior of slurries incorporating 40 vol% zirconia powder was examined as functions of dispersant content and solid load to obtain optimum dispersion conditions. In addition, the gelation time with an initiator, the de-binding behavior, and the main factors affecting densification were also examined. The densification of the gel-casted zirconia green body depended on the mixing ratio between the monomer and dimer, as well as the zirconia particle size. The green body with small particle size of 0.1 ㎛ showed less densification, with a relative density of 93%. This may be due to the excess bubbles created by interactions between the larger particle surface and polymer additives during the ball-milling process.
자동차 라디에이터 팬의 진동특성 및 발란싱에 대한 연구
김인웅(InWoong Kim),최현(Hyun Choi),박영필(YoungPil Park) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
The fan-shroud plays the important role in cooling down the engine heat by the forced convection. As the fan-shroud is made by injection molding, the unbalance of the fan blades is inevitable, and its low frequency characteristics makes it easy to excite the resonances of the environmental structures. So controlling its vibration, specially the dominant vibration source of unbalance vibration, is one of key factor to improve the sound and vibration quality of the modern vehicles. This paper introduces the plane balancing method, the most appropriate way of controlling the fan-shroud by generating the acceleration orbit measured from 2 accelerometers, and proves its balancing effect by the experiment.
김인웅(Woong-In Kim),오동열(Dong-Yul Oh) 한국중독정신의학회 2000 중독정신의학 Vol.4 No.2
Background:A number of epidemiological and medical studies have clearly documented the negative effects of smoking on health. The purpose of this study was to figure out the prevalence of smoking and the relationship between smoking status and alcohol drinking. Method:This study was carried out from April, 10th, 2000 to May, 30th, 2000 in 448 male adult lived in Seoul. We performed by using questionnaire, which includes demographic data, smoking status, alcohol drinking history, and stress levels by using the ‘Brief Encounter Psychosocial Instrument (BEPI)’. Results:The never smoker, ex-smoker, and smoker (mild-smoker, moderatesmoker, and heavy-smoker) constituted 24.3%, 13.4%, and 62.3% (8.5%, 31.0%, and 22.8%) of subjects respectively. Among the demographic data, the factors that were significantly associated with smoking status were monthly income, religion, and physical exercise. Compared with non-smokers and ex-smokers, smokers were more likely to lower monthly income, not exercise actively, and have no religion. Among the relationship between smoking status and alcohol drinking, smokers had higher incidence of alcohol drinkers and higher frequency of alcohol drinking than non-smokers and exsmokers. Drinkers of heavy-smokers had higher amounts of alcohol drinking than never-smokers and mild-smokers. The age of alcohol drinking initiation preceded that of smoking initiation. There was no significant relationship between smoking status and the scores of BEPI. Conclusion:The smoking status was significantly associated with monthly income, religion, and physical exercise of life style and alcohol drinking. So we suggest that reduction of smoking play an important role in abstinence of alcohol drinking, reduction of alcohol consumption and better life style.