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당귀약침액이 대식세포에서 산화질소(NO) 및 프로스타글란딘 (Prostaglandin) 생성에 미치는 영향
최유진,노정두,Choi, You-Jin,Roh, Jeong-Du 대한약침학회 2011 Journal of pharmacopuncture Vol.14 No.3
Objectives : Angelicae Gigantis Radix has been known traditional medicine with antimicrobial activities and it has been widely used for treatment of blood and inflammatory diseases. In the present study, some studies examined anti-inflammation effects of Angelicae Gigantis Radix but they usually were performed by ethanol extracted Angelicae Gigantis Radix pharmacopuncture. So We investigated the inhibitory effects of Angelicae Gigantis Radix pharmacopuncture by hot water and ethanol extract on Nitric oxide(NO) and Prostaglandin $E_2$($PGE_2$) production in lipopolysaccharide(LPS) induced macrophage cell. Methods : Angelicae Gigantis Radix was extracted by ethanol and hot water. Cell viability was determined by MTT assay. To evaluate anti-inflammation effects of Angelicae Gigantis Radix pharmacopuncture, we examined NO and $PGE_2$ production in LPS induced macrophages. The concentrations of NO and $PGE_2$ were measured by Griess assay and Enzyme Immuno-Assay. Results : 1) The MTT assay demonstrated that cytotoxic effect of Angelicae Gigantis Radix pharmacopuncture by hot water extract and ethanol extract in RAW 264.7 macrophage cells were not appeared. 2) Angelicae Gigantis Radix pharmacopuncture by ethanol extract and hot water extract inhibited NO production in LPS induced macrophages significantly. 3) Angelicae Gigantis Radix pharmacopuncture by ethanol extract tended to inhibiting $PGE_2$ production in LPS induced macrophages. And Angelicae Gigantis Radix pharmacopuncture by hot water extract inhibited LPS induced production of $PGE_2$ in RAW 264.7 macrophage cells significantly. Conclusions : This study suggests that Angelicae Gigantis Radix pharmacopuncture may have an anti-inflammatory property through the inhibition of NO and $PGE_2$ production in LPS induced macrophages. It may have a therapeutic potential for the treatment of various inflammatory diseases.
족관절 추나요법을 병행한 족관절 염좌 환자의 호전 비교
최유진,김정현,윤경진,여인호,이참결,이은용,노정두,Choi, You-Jin,Kim, Jung-Hyun,Yoon, Kyung-Jin,Yeo, In-Ho,Lee, Cham-Kyul,Lee, Eun-Yong,Roh, Jeong-Du 척추신경추나의학회 2012 척추신경추나의학회지 Vol.7 No.2
Objectives : The purpose of this study is to compare with the effect of general oriental medical treatment with or without ankle joint Chuna Manual Therapy for acute ankle sprain. Methods : We investigated 36cases of ankle sprain patients, and devided patients into two groups: One was treated general oriental medical treatment(Control Group) and the other was treated ankle joint Chuna Manual Therapy with general oriental medical treatment(Experimental Group). Results : 1. Each Group had significantly decrease in Visual Analogue Scale(VAS) and significantly increase in Ankle-Hind-foot Scale(AHS) after treatment. 2. Experimental Group was significant differences in Visual Analogue Scale(VAS) and Ankle-Hind-foot Scale(AHS) compare to Control Group. Conclusions : In this clinical study, general oriental medical treatment with ankle joint Chuna Manual Therapy was more effective in reduce ankle sprain pain and improve ankle joint function.
바이오매스 순환유동층 보일러의 열교환기 고온 부식 특성
최유진,배달희,이도연,Yujin Choi,Dal-hee Bae,Doyeon Lee 한국화학공학회 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.3
This paper presents the research results of analyzing the high-temperature corrosion characteristics of three currently commercialized heat exchanger tube materials under actual operating conditions of a biomass power plant. In order to precisely analyze the high-temperature corrosion characteristics of these materials, a high-temperature corrosion evaluation device was installed in the power plant equipment, which allows for adjusting the surface temperature of the heat exchanger tubes. Experiments were conducted for approximately 300 hours under various temperature and operating conditions. In this study, the commercialized heat exchanger tube materials used were SA213T12, SA213T22, and SA213T91 alloys. In order to objectively analyze the high-temperature corrosion characteristics of each material, an international standard-based process to remove corrosion products was applied to obtain the weight change of the specimens, and the average thickness loss and corrosion rate were derived. Thus, the high-temperature corrosion results for each condition were quantitatively compared and analyzed. In addition, in order to increase the reliability of the high-temperature corrosion evaluation method introduced in this study, the surface and cross-sectional corrosion of the specimens were confirmed by using scanning electron microscopy and energy-dispersive X-ray analysis. Based on these analysis results, it was found that the corrosion resistance of the commercial heat exchanger materials increases as the content of chrome and nickel in the composition increases. Additionally, it was found that the corrosion phenomenon is rapidly accelerated as the surface temperature increases. Finally, the replacement period (lifetime) of the heat exchanger tubes under each condition could be inferred through this study.
용접인력양성을 위한 가상용접훈련 시뮬레이터 효과성 분석
최유진,김중영,신상호,김상열,Choi, Eugene,Kim, Jung-Yeong,Shin, Sang-Ho,Kim, Sang-Yeol 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.3
Welding is one of the most fundamental and necessary work in the industry that demand sophistication of skilled workers. This study is to introduce welding simulator as a training tool, to verify its effectiveness and to measure satisfaction of the trainees. A group of freshman students at a Korea Polytechnics College in their twenties with less experience of welding participated in the study. They were divided into two groups and took a traditional training course (comparison group) and a training course with welding simulator applied reality/haptic technology (experimental group) for same hours respectively. To evaluate training effect, a national certificate test and a survey based on Phillips' ROI (Return on Investment) methodology were conducted by the students and the college respectively. And satisfaction survey among the students based on Kirkpatrick's Four-Level Evaluation Model was also carried out. The results showed that all students in the experimental group passed the national certificate test and the ROI of the experimental group for five years were 110% higher than the comparison group. Furthermore, 25% more students in the experimental group replied "very satisfied" about the overall training course and 75% more students in the same group found that the simulation was very similar to the real welding.
최유진,박진우,Choi, Yu-Jin,Park, Jin-Woo 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.4
The purpose of this study is to explore structural relationship between cognitive factors and emotional factors in predicting behavioral intention of duty-free users. This study conducted questionnaire survey on 246 users of duty-free shops and analyzed it by using structural equation. As the result of the study, attitude was significantly associated with both desire and behavioral intention. Subjective norm had a significant impact on desire, but had no significant imfact on behavioral intention. Whereas perceived behavioral control did not have a significant influence on desire and intention. Desire, which plays mediating role as a major variable in goal-directed behavioral model, turned out to not only have significant impact on behavioral intention but has the strongest effect as well. This study has its academic meaning in that it explored factors which have effect on decision-making process of duty-free users focusing on goal-oriented behavioral model, which is one of integrated psychological models. In practical terms, this study can be used as a basic material for corporations to establish goals in domestic duty-free shops.
M&S 신뢰도 확보를 위한 VV&A 절차 적용에 관한 연구
최유진,Choi, Yoo Jin 한국시스템엔지니어링학회 2009 시스템엔지니어링학술지 Vol.5 No.2
This study introduces the verification, validation & accreditation (VV&A) process for modeling & simulation (M&S). VV&A is standard process for credibility of M&S. In several countries including USA, for weapon system of Defense Development using M&S, VV&A is necessary procedures to acquire official approving for credibility of M&S. Many countries have regular recommend practice guide (RPG) and instructive for VV&A of M&S. In this study, we focus the VV&A key concepts as Department of Defense RPG of USA and give the outline of the main VV&A concepts because we don't have any available VV&A Instructive. Also, this report documents the first significant VV&A application for a MITS(M-SAM Integrate Test System) including Verification and Validation(V&V) activity and tasks.