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화장품용 W(마이크로바이오젤)/O/W 멀티-에멀젼 제조
정원욱(Won-Wook Jeong),서상권(Sang Gwon Seo),이의정(Eui Jung Lee),오주영(Joo-young Oh),이경진(Kyung Jin Lee) 한국고분자학회 2024 폴리머 Vol.48 No.1
Microbiogels made from natural polymers are attractive for biomedical applications such as drug delivery and have various manufacturing methods. However, it has drawbacks such as unstable yield and cumbersome separation process. This study presents a simple method to form cosmetic W (microbiogel)/O emulsion that produces microbiogel directly during cosmetic W/O emulsion manufacturing process and then stably produce the W (microbiogel)/O/W multi-emulsion through a continuous room temperature process. We confirmed that a partitioned structure was formed in which other particles exist within the particles dispersed in the outer water phase from microscopic observation of the prepared W/O/W multi-emulsion and the particle size and viscoelasticity of W/O emulsion and W/O/W multi-emulsion increased as the ratio of inner water phase (microbiogel) increased. This manufacturing method can produce high-content microbiogels and is of significant value in research on W/O/W cosmetic formulations that can encapsulate various water-soluble and oil-soluble active ingredients within a partitioned structure.
김태준,김낙수,박순철,정원욱,Kim, Tae-Joon,Kim, Nak-Soo,Park, Soon-Cheol,Jeong, Won-Wook 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12
Multiple impact models to examine the effect of stress interference are proposed and investigated. The single shot model analysis, which used various shot ball conditions, was carried out to compare with multiple impacts analysis. Then the multiple impact analysis were performed to predict the effect of the shot ball distances. The results showed that the stress interference in the multiple impact model significantly reduced the maximum value of the compressive residual stresses. The residual stress profiles were strongly effected by the shot ball distances. The multiple impact model can simulate a realistic shot peening process rather than a single shot model does. It is concluded that the proposed model predicts the real process more accurately.
충격 압력을 받는 파워스티어링 시스템의 고압호스 수명 예측
이기천(Gi Chun Lee),김형의(Hyoung Eui Kim),박종원(Jong Won Park),이종황(Jong Hwang Lee),정원욱(Won Wook Jeong),임영한(Young Han Lim),황권태(Kwon Tae Hwang),이영신(Young-Shin Lee),김재훈(Jae Hoon Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.1
유압호스는 적용되는 압력에 따라서 저압, 중압, 고압으로 구분되어진다. 승용차의 파워스티어링 시스템은 저압부와 고압부 시스템으로 구분되어질 수 있다. 본 연구의 목적은 차량이 회전할 때 발생되는 충격압력이 고압호스부에 적용될 때 수명을 예측하는 것이다. 내부와 외부 조건을 조절하기 위해서 충격 압력과 작동유의 온도는 충격압력 시스템에서 제어되는 것이 필요하다. 충격압력 시험에서 압력과 작동유 온도만을 조절하여 얻은 결과는 고압호스의 수명을 예측하기 위한 조절형 가속수명시험을 적용하였으며, 또한 유한요소법으로 스웨이징부를 해석하였다. The hydraulic hose can be divided with the low pressure, the medium pressure, and the high pressure hose according to the applied pressure. The power steering system in a passenger car can be divided with the high pressure and the low pressure hose. This study deals with the life prediction for high pressure hose to be given impulse pressure which was generated in turning the car. To adjust with external and internal condition, impulse pressure and oil temperature need to be controlled with impulse test system. The result, which is only controlled with the pressure and oil temperature, adapted Calibrated Accelerated Life Test(CALT) method to predict the life of the high pressure hose and analyzed the swagging part by finite element method during the impulse test.