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소성 가공 해석을 통한 티타늄 합금 볼트 열간 단조 공정 분석
최두선,김태민,항봉석,한유진,고강호,박정래,박규백,이정우,김도언,Choi, Doo-Sun,Kim, Tae-Min,Han, Bong-Seok,Han, Yu-Jin,Ko, Kang-Ho,Park, Jung-Rae,Park, Kyu-Bag,Lee, Jung-Woo,Kim, Do-Un 한국금형공학회 2020 한국금형공학회지 Vol.14 No.1
Titanium alloy has been in the spotlight as a core material in high-tech industries that require high strength and light weight because it has excellent strength and corrosion resistance and strength is higher than that of steel. Therefore, in various industries, existing steel products are intended to be replaced with titanium alloys. Titanium alloys can cause cutting tool breakage during cutting, and heat generated during cutting does not dissipate, accumulates in tools and workpieces, resulting in large wear and tear on thin workpieces. In addition, since titanium alloy is a metal with high chemical activity, the wear of the tool becomes more severe when the cutting speed is high, so machining of titanium bolt through cutting is very disadvantageous in terms of productivity. Therefore, the production of bolts using titanium alloys is being produced through a forging process to improve productivity and product quality. In this paper, hot forging molding analysis was performed on bolts used for fastening automobile parts using Ti-6Al-4V alloy, which is the most commonly used titanium alloy.
Enhancement of Antioxidative Activities of Codonopsislanceolata by stepwise hot steaming process
Chi-Ho Song(송치호),Woon-Yong Choi(최운용),Ji-Seon Kim(김지선),Choon-Geun Lee(이춘근),Yong-Chang Seo(서용창),Dong-Sik Park(박동식),Jae-Youn Chung(정재윤),Do-Un Kim(김도언),Hee-Chul Chung(정희철),Choong-Je Ma(마충제),Hyeon-Yong Lee 한국약용작물학회 2012 한국약용작물학회 학술대회논문집 Vol.2012 No.1
초고압균질기 밸브 타입에 따른 coenzyme Q10 나노에멀젼의 제조 및 안정성
임지선(Ji-Sun Lim),강호진(Ho-Jin Gang),윤성우(Sung-Woo Yoon),김형민(Hyeong-Min Kim),석종우(Jong-Woo Suk),김도언(Do-Un Kim),임재각(Jae-Kag Lim) 한국식품과학회 2010 한국식품과학회지 Vol.42 No.5
본 연구에서는 coenzyme Q<SUB>10</SUB>을 나노에멀젼화 하기 위해 초고압균질기를 이용하여 3가지 다른 형태의 밸브를 대상으로 평가를 진행하였으며, 선정된 밸브를 사용하여 제조된 coenzyme QSUB>10</SUB> 나노에멀젼의 품질 특성 및 안정성 평가를 하였다. 초고압균질기를 이용한 coenzyme QSUB>10</SUB> 나노에멀젼 제조 시 최적 조건은 150 MPa, C 밸브, 통과 횟수 3회이었다. 제조된 나노에멀젼은 평균입자 크기가 40 nm, 제타 전위 값이 -57 mV을 나타내어 콜로이드 상태가 충분히 안정하다고 볼 수 있었다. 또한 수용액에 빠르게 분산되었으며, 이때 coenzyme QSUB>10</SUB> 100 mg을 함유한 증류수 100 mL의 투과도 값이 90(%T)로 투명한 용액을 얻을 수 있었다. 제조한 coenzyme QSUB>10</SUB>나노에멀젼은 4℃ 및 25℃에서 12주 동안 보존하여도 침전 또는 부유물을 발생시키지 않았고 coenzyme QSUB>10</SUB> 함량이 변하지 않았으며, 10일간의 동결처리 후에도 안정하였다. pH 2 용액을 제외하고는 pH(4-10) 처리와 열(95℃)처리 및 동결(?20℃)처리 시에도 안정하였다. 따라서 제조된 coenzyme Q<SUB>10</SUB> 나노에멀젼은 액체 형태 등 다양한 식품에 적용할 수 있는 가능성을 확보하였으며, 유통시에는 상온보다는 냉장 보관이 더 적합할 것으로 판단된다. A coenzyme Q10 nanoemulsion was prepared using high pressure homogenization with different valve type conditions (A, B, and C) and cycle numbers (1, 2, and 3). The particle size, transmittance, zeta potential, and coenzyme Q10 content of the prepared coenzyme Q10 nanoemulsion were measured. The stability of the prepared coenzyme Q10 nanoemulsion was evaluated on heating (95℃), freezing (-20℃), and different pH (2-10) conditions. Also, the prepared coenzyme Q10 nanoemulsion was stored at different temperatures of 4, 25, and 40℃ for 12 weeks to evaluate its storage stability. In this study, the optimal conditions of high pressure homogenization for the preparation of a coenzyme Q10 nanoemulsion were identified to be 150 MPa, C valve, and a cycle number of 3. The results showed that the prepared coenzyme Q10 nanoemulsion had an average particle size of 40 nm, generated no deposits or floating matter when stored at either 4 or 25℃ for 12 weeks, and displayed excellent dispersibility and transparency when processed at different pHs (4-10) or heating (95℃) and, freezing (-20℃) conditions. Our results indicated that a coenzyme Q10 nanoemulsion prepared by high pressure homogenization can be used for preparing beverages in the food industry.