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Sooting 및 Non-Sooting 정상 확산 화염에서 생성되는 매연 입자의 특성에 대한 연구
최인철,이재복,황정호,Choi, In-Chul,Lee, Jae-Bok,Hwang, Jung-Ho 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.7
Characteristics of carbon soot particles generated in diffusion flames were studied. Non-sooting and sooting normal diffusion flames using propane or ethylene as fuel were selected. In the flames, soot volume fraction was measured by a thermocouple, and primary particle diameter and cluster size were analyzed by TEM photographs. The characteristics of soot particles depended on flame(non-sooting or sooting) and fuel(propane or ethylene) type. Unlike the sooting diffusion flames, particle growth and oxidation processes were clearly observed in the non-sooting diffusion flames. In the sooting diffusion flames, soot particle size was slightly changed at the flame tip.
나노압입시험법을 이용한 열처리 소재의 미소 변형 거동 평가
최인철 ( In-chul Choi ) 한국열처리공학회 2020 熱處理工學會誌 Vol.33 No.2
To improve the mechanical properties of most structural materials for industrial applications, the control of microstructure is essential by heat treatment process or plastic deformation process. Since the mechanical behavior of structural materials is significantly influenced by their microstructure, it is inevitably preceded to understand the relationship between microstructure and strengthening mechanisms of materials which can be easily changed by heat treatment. In this regard, the nanoindentation test is useful technique for analyzing the influence of the localized microstructural change on small-scale mechanical behavior of various structural materials. Here, the interesting studies performed on various heat-treated materials are reviewed with focus on micromechanical properties obtained by nanoindentation, which are reported in the available literature. (Received March 10, 2020; Revised March 16, 2020; Accepted March 20, 2020)
최인철(In Chul Choi),최성관(Sung Kwan Choi),정상립(Sang Lip Chung),김성화(Sung Hwa Kim) 대한피부과학회 1989 대한피부과학회지 Vol.27 No.3
We report 2 cases of eosinophilic pustular folliculitis, one in s 29-year-old woman and the other in a 24-year-old man. Crops of papules and pustules developed on well demarcated, walnut-sized, erythematous plsques on the cheeks and forehead. Eruptions were more pronounced on the periphery of the plaques with central clearing. Blood eosinophilia was evident in case 1. Histologic findings showed a dense inflammatory infiltration and abscesses composed mainly of eosinophils in and around hair follicles, sebaceous glands and around blood vessels. We could see beneficial responses by administration of dapsone in both cases, but its effect was just suppressive and temporary.
위도에 따른 토양내 Keratinophilic Fungi의 분포 상태
최인철(In Chul Choi),전재복(Jae Bok Jun) 대한피부과학회 1989 대한피부과학회지 Vol.27 No.6
With a view to investigating the distribution of keratinophilic fungi in soil according to latitudes in south Korea, soil samples were collected at 81 sites in 17 areas in different latitudes across the country and keratinophilic fungi were isolated by means of Vanbreusegherns technique. The results are summarized as follows : 105 strains of keratinophilic fungi were recovered from 56(69.2%) out of 81 samples. Isolated fungi were composed of 41 strains of Trichophyton ajelloi, 24 stains of Chrysosporium species, 20 strains of Microsporum gypseum, and 20 strains of M. cookei. Frequency of isolation of keratinophilic fungi tended to decrease from higher latitudes down to lower latitudes. In areas of higher latutudes, T. ajelloi and M. cookei were isolated more frequently than in lower latitudes. M. gypseem was most frequent in Cheju City, and Chrysosporium species showed an even distribution, Among three areas under different conditions of moisture and shadedness(i.e., shaded wet, shaded dry, and sunny dry areas), frequency of isolation was highest in shaded dry areas(72.2%). T. ajelloi was the most frequent species in all the three areas, especially in shaded wet areas(53.1%). No M. gypsetcm was found in shaded dry areas. As regards distribution at various sites, roadsides and streamsides exhibited the highest frequency of isolation, and hills the lowest. Except for roadsides, T. ajelloi was the most frequent species at all sites, especially in forests. M. gypseum was frequent at sites beside streams M. cookei at streamsides, fields, and hills and Chrysosporim species in gardens, forests, and streets.
마찰용접을 적용한 Cu-Al Busbar의 전기적 물성 연구
김기영,최인철,오명훈,Kim, Ki-Young,Choi, In-Chul,ITO, Kazuhiro,Oh, Myung-Hoon 한국열처리공학회 2020 熱處理工學會誌 Vol.33 No.6
Since the dissimilar bonded interface usually consists of intermetallic compounds (IMCs) layer and cracks, their mechanical and electrical properties can be influenced by microstructure at interface between two different metals. In this study, the friction welded Cu-Al busbar, which is widely used to connect a secondary battery and their component, is selected to analyze the influence of interfacial characteristic on their tensile strength and electric conductivity. Then, the electrical characteristics of Cu busbar and Cu-Al busbar were investigated by thermal flow analysis and temperature rise test. In addition, the relationship between the maximum saturation temperature and the electrical conductivity were discussed in terms of interfacial characteristics of the friction welded Cu-Al busbar.
김정현,도진아,최인철,임명호,Kim, Jeong Hyeon,Do, Jin A,Choi, In Chul,Lim, Myung Ho 대한불안의학회 2015 대한불안의학회지 Vol.11 No.1
Objective : The current study investigated the personality characteristics in the victims of sexual violence, by using the Minnesota Multiphasic Personality Inventory (MMPI) test which are commonly used in clinical medicine. Methods : A total of 40 victims of sexual violence (only female) completed the Korean version of the MMPI. 31 (77.5%), and theywere patients with posttraumatic stress disorder. These victims of sexual violence had been admitted to the Dankook University Hospital in Cheonan. Results : The MMPI scores of the sexual victims were significantly higher on Hs, D, Hy, Pd, Pa, Pt, Sc, and Si, than the comparison group by ANCOVA. Conclusion : The victims of sexual violence may have developed the following characteristics: hypochondriasis, depression, hysteria, psychopathic deviate, paranoia, psychasthenia, schizoid and social introversion. The finding suggests psychotic psychopathology rather than neurotic psychopathology. These results suggested that the psychopatholgy in the victims of sexual violence may be different, compared to the control group.
디젤엔진의 공해물질 저감을 위한 플라즈마 개질기 특성 연구
채재우(Chae Jae Ou),최인철(Choi In Chul),Knak Alexandre(Knak Alexandre),탁선재(Tak Sun Jae),이창민(Lee Chang Min),곽용환(Kwak Yong Hwan) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, a new plasma system is introduced to the generation of hydrogen-rich gas for decreasing pollutants from diesel engine and for other applications. The designed plasma system allows to reform diesel fuel i nto hydrogen rich gas (H₂ + CO). Plasma boosts partial oxidation reaction that reforms hydrocar bon fuels into hydrogen-rich gas partial oxidation (at oxygen/carbon ratio = 1, exothermic reactio n). As a source of non-equilibrium plasma, we used a low current plasmatron with convective co oling of electrodes. Power supply of a plasma generator was as followings: DC power supply (400-800V, 1-4A) and pulse generator (2.5-3.5kV, 20-1OOmA, 10-15kHz). We gauged the gas composition in reformed gas by GC-TCD, concentration change of hydrogen as a function of current applied to the reformer. The outcomes of experiments allow to draw a conclusion about high performance of a d esigned plasma system. Potential exhaust aftertreatment applications: NO_x, absorber catalyst regeneration, HC SCR aftertreatment, and operation of Diesel Engine on air-fuel mixture with hydrogen admixtures.<br/>