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3次元 空間 電流座標에 의한 電力分析과 能動電力필터의 性能評價用 시뮬레이터 開發
나석환,최찬학,정영국,정화균 여수대학교 1993 論文集 Vol.7 No.-
The definition of traditional 2-DS power factor current and co-ordinate did not represent clearly relation to power facter in circuit with nonlinear thyristor loads. A new simulator for performance evaluation of Active Power Filter (APF) by 3-D space current co-ordinate applicale to general power system have not been developed, because reserchers were merely interested in improvement of source current waveforms by using APF or its simulator. Moreover, There was not APF simulator with power analysis capability which was developed for the better. Current was decomposed by active, reactive, distortion, by digital correlation signal proccessing techique based on Nowomiejski theory. Therefore, A new 3-D space current co-ordinate composited by 3 current components was defined in this paper. A new 3-D space current co-ordinate was shown state and location of current vector by trajectories with 3-D co-ordinate rotation. It evidently has excellent performance not only performsance evaluation method of APF but alse evaluation method of general power system, not conventional domain but other domain. By proposed 3-D soace co-ordinate, space power factor is derived, the true state of physical meaning is proved, new distortion factor was proposed, this study was proved true state of appropriation throughout development of simulator for APF performance evaluation with power analysis capability.
홍나영,유혜경,이주현,석혜정,신혜성,김찬주 服飾文化學會 2003 服飾文化硏究 Vol.11 No.3
The main purpose of this exploratory research was to examine the characteristics of consumers who patronize natural-dyed clothes and their perceptions regarding natural-dyed clothes. Thirty three participants who have worn natural-dyed clothes were interviewed for the study. They were asked about styles and price of natural-dyed clothes they owned, their evaluation on them, and the lifestyles of themselves. Existence of subculture among the interviewes and its characteristics were also probed. The results indicated that natural-dyed clothes are relatively high-priced, mostly of modified hanbok style, and became popular in recent years. Interviewees frequently mentioned uniqueness and comfort as the main benefits of natural-dyed clothes, and expressed dissatisfaction regarding color fastness, easy care and problem of coordination. The consumers of natural-dyed clothes appeared to have strong preferences for environment conservation and Korean traditional culture. They also seemed to form a subcultural group who have commonality in their involvement in Korean cultural activities, mainly tea ceremony.
산화아연계 무기질과 솔잎추출물 첨가에 의한 농산물 포장 필름의 광 및 미생물 열화능 개선
한신,나현정,강용구,박찬영 전남대학교 촉매연구소 2001 觸媒硏究 論文集 Vol.22 No.-
To invent environmentally friendly materials for packaging of agricultural produce, morphological and mechanical properly changes after daylight exposure and soil deposit for LDPE films composed of different incorporation substances have been investigated. Silver coated ceramic, zinc oxide, fine particle of ferrofluid and pine needle's extract were the incorporated substances. The pine needle's film degrades fast in soil while the silver coated ceramic's film shows daylight decay more on the morphological view. The mechanical strength keeps almost same. But turndown of elongation is explicit on the pine needle's film and silver coated ceramic's film.
김광섭,심승우,나현정,조인철,정흥조,박찬영 전남대학교 촉매연구소 2001 觸媒硏究 論文集 Vol.22 No.-
Fruit are normally kept in a pouch of cold storage room in winter. In this work, a mathematical model that is emulating the fruit respiration in the pouch of the storage has been established. The calculated result is compared to the actual measured gaseous composition change of pear in the packaging pouch LDPE film incorporated with silver coated ceramic powder. The presented model, that is combining polysaccharide digestion kinetics in pear, Fickian diffusion for permeation of the film and sigmoidal adsorption equilibrium between the film and gases, predicts the respiration of the pear in the packing film fairly well.
( Jung Im Na ),( Jung Won Shin ),( Sang Young Byun ),( Hye Ryung Choi ),( Kyoung Chan Park ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.2
Background: There are many whitening agents for melasma treatment, but in aspects of potency and safety, few treatment agents exist. To evaluate whitening agents we previoulsy suggested a new parameter: a ratio of lesion/non-lesional melanin index (MI ratio) to compensate the seasonal effects. Objectives: In this study, we evaluated the efficacy of 4n-butyl resorcinol and resveratrol containing cream using MI ratio and compared the efficacy with other whitening agents. Methods: 21 females with melasma were enrolled. Subjects used 4n-butyl resorcinol and resveratrol containing cream for 4 weeks. Skin color of the lesional and preauricular non-lesional skin was measured with a Mexameter at baseline, week 2 and week 4, and MI ratio was obtained. To compare the efficacy with other whitening agents for melasma, MI ratio was obtained from the data of seven other clinical trials performed in Seoul National University Bundang Hospital. Results: Mean MI of lesional skin decreased from 201.1 to 189.4 at week 2 and 182.8 at week 4, and the difference was statistically significant from week 2. MI ratio decreased from 155.9% at baseline to 142.5% at week 4 (-13.4%). This result was compared with that of seven other clinical trials on whitening agents. Among eight different whitening agents, 4n-butyl resorcinol and resveratrol containing cream showed the biggest decrease of MI ratio at week 4. Conclusion: 4n-butyl resorcinol and resveratrol containing cream has fast and potent whitening effect on melasma.