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가속열화시험에 따른 케이블의 수명평가에 대한 신뢰성분석
정진동(Jin-Dong Jeong),이지연(Ji-Yeon Lee),강신동(Sin-Dong Kang),김재호(Jae-Ho Kim) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.11
This paper comparatively analyzed the characteristics of the insulation resistance of TFR-8(Tray Frame Retardant power cable for fire service) cables according to accelerated degradation temperature and thermal stress application methods to ensure the validity of the accelerated degradation life test using the Arrhenius model. The study derived accelerated degradation times according to accelerated degradation temperatures by applying the Arrhenius model, and it manufactured cable specimens with equivalent lifetimes of 10, 20, 30, and 40 years using a forced-convection oven. The insulation resistance decreased as the temperature increased, and the measured insulation resistance of equivalent-lifetime cables were similar. The experimental results of constant thermal stress and step-stress application methods were also similar. These results verify the validity of the correlation between the Arrhenius model’s temperature and the chemical reaction rate. However, the accelerated degradation time could vary according to the calculation method of activation energy, which requires follow-up studies.
제스프리 그린 키위의 주요 영양성분 및 헥산 분획물의 신경세포 보호효과
진동은(Dong Eun Jin),김현주(Hyeon Ju Kim),정지희(Ji Hee Jeong),조유나(Yu Na Jo),권오준(O-Jun Kwon),최성길(Sung-Gil Choi),허호진(Ho Jin Heo) 한국식품과학회 2014 한국식품과학회지 Vol.46 No.3
Zespri green kiwi의 무기질은 K, P, Ca 순으로 많았으며, 아미노산은 glutamic acid, aspartic acid, arginine 순으로 많이 함유되어 있었다. 지방산 함량은 a-linolenic acid, oleic acid 순으로 많이 함유되어 있었으며, 유리당은 fructose 함량이 가장 높았다. Vitamin C와 β-carotene 함량은 각각 29.21 mg/100 g, 1.35 μg/100 g이었다. Total phenolics는 n-hexane 분획물이 11.83 mg GAE/g으로 가장 높았으며, ABTS radical 소거활성 및 지질 과산화 억제활성에서는 농도 의존적으로 in vitro 항산화 활성이 증가하는 경향을 보였다. 또한 oxidative stress에 대한 신경세포 보호효과 역시 농도 의존적 경향을 보여주었다. 본 연구 결과를 종합해볼 때, 생리활성 소재로서의 phenolics를 함유한 kiwi fruit (A.deliciosa)는 invitro 항산화 활성과 함께 신경세포 보호효과를 기초로 한 고부가가치 건강지향식품 소재로서의 활용가치가 높다고 판단된다. The physiological characteristics of kiwi (Actinidia delicosa) fruit were analyzed, which inclued its nutritional composition, in vitro-antioxidant activities, and neuronal cell protective effects. The most abundant components of mineral, amino acid, and fatty acid were found to be potassium (K), glutamic acid, and a-linolenic acid, respectively. The major free sugars were fructose, glucose, and sucrose. In addition, β-carotene and vitamin C contents were 1.35 μg/100 mL and 29.21 mg/100 g, respectively. The 2,2-azinobis-(3-ethylbenothiazline-6-sulfonic acid) (ABTS) radical-scavenging activity of the n-hexane fraction obtained from the kiwi extract was 10.52% at a concentration of 1000 μg/mL. The malondialdehyde (MDA) inhibition of the n-hexane fraction was found to increased in a dose-dependent manner. The intracellular reactive oxygen species (ROS) accumulation after hydrogen peroxide (H₂O₂) treatment of PC12 cells was significantly reduced in the presence of the n-hexane fraction compared to PC12 cells treated with H₂O₂ only. Moreover, in the a MTT assay, the n-hexane fraction showed in vitro-protective effects against H₂O₂-induced neurotoxicity.
Black Soybean Extract Protects Against TMT-Induced Cognitive Defects in Mice
정지희,조유나,김현주,진동은,김대옥,허호진 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.1
To find a neuroactive compound with a potent inhibitory effect on acetylcholinesterase (AChE) and in vivo anti-amnesic activity from natural resources, we evaluated anthocyanins and nonanthocyanins from black soybean extract. Nonanthocyanins from black soybean extract were the most potent and dose-dependent AChE inhibitors. Intracellular reactive oxygen species accumulation resulting from H2O2 treatment was significantly decreased compared with cells treated with H2O2 only. Nonanthocyanins were also neuroprotective against H2O2 treated neurotoxicity by 3-[4,5-dimethythiazol-2-yl]-2,5-diphenyl tetrazolium bromide (MTT) and lactate dehydrogenase (LDH) assay. Finally, nonanthocyanins from black soybean in the preadministration group attenuated trimethyltin (TMT)-induced memory injury in both in vivo tests. AChE, prepared from mice brain tissues, was inhibited by nonanthocyanins from black soybean in a dose-dependent manner. Malondialdehyde generation in the brain homogenates of mice treated with nonanthocyanins from black soybean was decreased. We concluded that nonanthocyanins from black soybean had an efficacious in vitro AChE inhibitory activity, and protected against H2O2-induced neurotoxicity. In addition, our findings suggest that nonanthocyanins from black soybean may improve the TMT-induced learning and memory deficit because of AChE inhibition of mice brain tissue. Consequently, these results demonstrate that the nonanthocyanins from black soybean could possess a wide range of beneficial activities for neurodegenerative disorders.
축제 참가자 참여동기, 매력성, 관여도, 만족도 연구 : 한ㆍ일 야간축제를 중심으로
류인평,정총화,손진동 관광경영학회 2018 관광경영연구 Vol.83 No.-
Although the development of local festivals has led to many scholarly studies on festivals but there are few studies on night festivals. The purpose of this study is to suggest the implications of improving the quality of Korean festival by participation on motivation, attractiveness and involvement of festival, focusing on Korea and Japan night festival. For the empirical analysis of the survey, the spatial range was limited to the venue where "Gamaek Festival" was held Jeonju in Korea and "Yosakoi Festival" was held Kochi in Japan. The time range was from Aug. 10 to 12, 2017, when the "Gamaek Festival" was held, and "Yosakoi Festival" was held from August 11 to 13, 2017. During this period, 105 copies were distributed for each festivals to visitors. The content scope is composed of 5 chapters. First, Participants in Korea and Japan will have different motives for participation. Second, the attractiveness of Korean and Japanese festival participants will be different. Third, the involvement of participants in Korea and Japan festival will be different. Fourth, the satisfaction level of participants in Korea and Japan festival will be different. The result of Analysis is First, motivation for participation was significant in significance and deviation. Second, only the convenience was significant in the analysis of attractiveness difference. Third, in the analysis of difference between involvement and satisfaction, all results were significant.