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멀티 유화 기술 이용 수분산성의 항산화 효능을 함유한 커큐민의 개발
이경행,이은현 한국식품영양학회 2021 韓國食品營養學會誌 Vol.34 No.6
Curcumin is not soluble in water. Therefore, curcumin emulsion that can dissolve well in water were prepared using multi-emulsification technology, and the antioxidant activities and physical properties of emulsion were measured. Although curcumin was not dissolved in water, it was confirmed to be well dispersed in water when prepared in an aqueous dispersion curcumin emulsion. After dissolving curcumin using water and ethanol as solvents, respectively, the DPPH and ABTS radical scavenging abilities of the filtrate and the curcumin emulsion were measured. Because it was not dissolved in water, activities were not shown. However, when curcumin was dissolved in ethanol, the activities increased as the concentration of curcumin increased. On the other hand, when the curcumin emulsion was dissolved in water, it was found to have abilities. The curcumin emulsion was nano-homogenized and the size and distribution of the emulsified spheres were measured. It was confirmed to be nano-sized as it appeared as 9.083 nm/100%. In the results of the DPPH radical and ABTS radical scavenging abilities of curcumin nano-emulsion, it was confirmed that there was no change in the antioxidant abilities. In conclusion, water-dispersible curcumin prepared using multi-emulsification technology, and it was confirmed to exhibit antioxidant activity and emulsion stability.
이경행,윤예지,권혜원,이은현,Lee, Kyung-Haeng,Yoon, Ye-ji,Kwon, Hye-Won,Lee, Eun-Hyun 한국식품영양학회 2018 韓國食品營養學會誌 Vol.31 No.6
To improve the utility of apple, apple flesh (Malus domestica cv. Fuji), pomace and peels were dried and then extracted using solvents (water, 70% and 100% ethanol). The contents of polyphenols, flavonoids, ascorbic acid, ursolic acid and antioxidant activities were measured as extracted from the apple flesh, pomace and peel. The content of polyphenols was the highest in the apple peel when 100% ethanol was extracted. The content of flavonoids was about 3~8 times higher in apple peel than those of flesh and pomace, and 70% ethanol extract was the highest content. Ascorbic acid content was the highest in apple peel as well as flavonoid content. The content of ursolic acid in the apple flesh was not detected in water and ethanol extraction. In the case of apple pomace and peel, ursolic acid was not detected in water extract but it was detected when ethanol was extracted. The content of ursolic acid was highest in the apple peel. In the case of antioxidative activity, DPPH and ABTS radical scavenging ability showed the highest ability when apple peel was extracted with 70% ethanol.
중쇄지방산을 활용한 글리세린 지방산 에스테르의 화학 합성 및 항균 활성
이경행,이은현 한국식품영양학회 2023 韓國食品營養學會誌 Vol.36 No.5
A mono-type glycerine fatty acid ester compound was chemically synthesized using medium-chain fatty acids with antibacterial activity, and the physicochemical quality and antibacterial activity of the synthesized glycerine medium-chain fatty acid ester compound were measured. At a reaction molar ratio of MCT(medium chain triglyceride) to glycerine of 1:2.5, 48.15% mono ester was produced. The physicochemical analysis of the synthesized glycerine fatty acid ester compound showed an acid content of 0.38~0.60%, which tended to increase slightly as the glycerine molar ratio increased. The saponification value decreased as the synthesized molar ratio of glycerine increased from 218 to 284. The number of bacteria was measured to confirm the degree of antibacterial activity of glycerine medium-chain fatty acid esters against food poisoning bacteria, Bacillus cereus and Salmonella typhi. The number of bacteria significantly decreased as the MCT:glycerine molar ratio increased. In particular, the antibacterial effect between the treatment groups was the highest when at an MCT:glycerine molar ratio of 1:2.5.
이경행,서형필,권용수,김지원,Lee, Kyoung-Haing,Seo, Hyeong-Pil,Kwon, Yong-Soo,Kim, Jiwon 한국시뮬레이션학회 2015 한국시뮬레이션학회 논문지 Vol.24 No.3
본 연구에서는 북한의 잠수함 발사 탄도미사일의 비행궤적을 시뮬레이션하고 발사방법에 따른 특성을 분석하였다. 최근 북한은 잠수함 발사 탄도미사일의 비행시험을 실시하였으며, 이는 국제적인 안보에 상당한 위협이 되고 있다. 북한은 러시아의 퇴역 잠수함을 해체하는 과정에서 잠수함 발사 탄도미사일 관련 기술을 확보하였고, 이와 관련된 실험을 지속적으로 하는 것으로 알려졌다. 북한의 잠수함 발사 탄도미사일 개발이 완료되고 실전 배치된다면, 이는 우리나라에 비대칭적인 위협 요소로 작용하게 될 것이다. 따라서 이러한 위협에 능동적으로 대응하기 위해서는 잠수함 발사 탄도미사일의 위협에 대한 과학적이고 논리적인 분석이 이루어져야 한다. 이러한 관점에서 본 연구에서는 북한의 잠수함 발사 탄도미사일의 운동 모델을 작성하고 이를 시뮬레이션 하였다. 또한 잠수함 발사 탄도미사일의 자세각을 조절하여 사거리를 조정하였으며 이에 대한 특성변화에 대해 기술하였다. 도출된 SLBM 비행궤적을 고려할 때 중간 단계부터 종말 단계까지의 효과적인 대응을 위해서는 해상기반 탄도미사일 방어체계가 필수적으로 요구되어 진다. This research focuses on analysis of the flight trajectory characteristics of SLBM (Submarine Launched Ballistic Missile) of North Korea. Recently, North Korea tested launching of SLBM which is threatening international security. Also it is known that North Korea had possessed the technologies about SLBM since they disassembled submarines out of commission of the former Soviet Union. If the development of the SLBM of North Korea is completed, it should be affected as asymmetric threat to South Korea. Therefore, for active respondence to these threat, it is essential to analyze the SLBM systematically. In this point of view, this work made a SLBM flight model and simulated. In addition, we controled flight trajectories according to adjusting loft angle and described their characteristics. The sea-based ballistic missile defense system is required for an effective response to the flight trajectory of the SLBM from mid-course to terminal phase.
이경행,한지희,권용수,고남경,Lee, Kyung Haeng,Han, Ji Hee,Kwon, Yong Soo,Ko, Nam Kyung 한국시스템엔지니어링학회 2007 시스템엔지니어링학술지 Vol.3 No.2
This paper describes a basic process of reliability analysis in shipped guided weapons. The OMS/MP provides originating data for RAM analysis. However, The process of reliability analysis is often done with an insufficient understanding of OMS/MP. This work proposed the improved reliability analysis process with Relax. It is shown that the process is applicable to shipped guided weapons.