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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.
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.
백서에서 Aspirin과 Prostaglandin E<sub>1</sub>이 미세혈관 문합의 개존에 미치는 효과
이광석,서정대,한승범,이승준,최인철,김인선,조성진,Lee, Kwang Suk,Suh, Jeong Dae,Han, Seung Beom,Lee, Seung Joon,Choi, In Chul,Kim, In Sun,Cho, Seong Jin 대한미세수술학회 2000 Archives of reconstructive microsurgery Vol.9 No.2
In the field of microsurgery, the vascular obstruction of the microvascular anastomosis by thrombus is one of the most important complication. The purpose of this study is to compare the effect between aspirin and prostaglandin $E_1$($PGE_1$) which act as the peripheral vasodilatation and platelet disaggregation. We have used total 48 white male rats and divided them into three gruoups(A, B and C group). Each group consists of 16 rats respectively. A group is as control, B group is medicated with aspirin(3.0mg/kg/day) and C group with $PGE_1(1.2{\mu}g/kg/day)$. The gross and histopathologic findings at anastomosed site were observed on 3, 5, 10 and 15 days after vascular anastomosis and the results were obtained as the followings. 1. The microvascular patency rate is 81.2% in control group, 93.8% in aspirin group and 100% in $PGE_1$ group. 2. On the histologic examination, the formation of mural thrombus is decreased both in the aspirin and $PGE_1$ group as comparing with the control group and also the hypertrophy of the intima forming from media is less formed in $PGE_1$ group than aspirin group and the degree of thickeness is also less. 3. The fibrosis of media is less observed in $PGE_1$ group than aspirin group. According to the above results, the application of $PGE_1$ to the microsurgery is considered to be effective on the prevention of the thrombus formation and on providing high patency rate.
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.
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.
삽입금속 Cu를 이용한 TiAl 합금과 SCM440의 마찰용접 계면 특성
박성현,김기영,박종문,최인철,오명훈,Park, Sung-Hyun,Kim, Ki-Young,Park, Jong-Moon,Choi, In-Chul,Ito, Kazuhiro,Oh, Myung-Hoon 한국재료학회 2019 한국재료학회지 Vol.29 No.4
Since the directly bonded interface between TiAl alloy and SCM440 includes lots of cracks and generated intermetallic compounds(IMCs) such as TiC, FeTi, and $Fe_2Ti$, the interfacial strength can be significantly reduced. Therefore, in this study, Cu is selected as an insert metal to improve the lower tensile strength of the joint between TiAl alloy and SCM440 during friction welding. As a result, newly formed IMCs, such as $Cu_2TiAl$, CuTiAl, and $TiCu_2$, are found at the interface between TiAl alloy and Cu layer and the thickness of IMCs layers is found to vary with friction time. In addition, to determine the relationship between the thickness of the IMCs and the strength of the welded interfaces, a tensile test was performed using sub-size specimens obtained from the center to the peripheral region of the friction-welded interface. The results are discussed in terms of changes in the IMCs and the underlying deformation mechanism. Finally, it is found that the friction welding process needs to be idealized because IMCs generated between TiAl alloy and Cu act to not only increase the bonding strength but also form an easy path of fracture propagation.
최성관(Sung Koan Choi),최인철(In Chul Choi),정상립(Sang Lip Chung),서순봉(Soon Bong Suh) 대한피부과학회 1987 대한피부과학회지 Vol.25 No.6
We report two cases of nonvenereal sclerosing lymphangitis of the penis in a 34-year old man and a 28-year-old man. This disorder is an uncommon condition characterized by asymptomatie, firm, cord-like lesion of unknown etiology. Histopathologic findings reveal hypertrophy and sclerosis of lymphatic vessel walls, and some cases show thrombus formation within dilated vessels. Both cases had typical clinical and histopathologic features. In case I, the lesion resolved spontaneously on several occasions for 10 years. Therefore we argue that some individual rnay be predisposed to develop the condition, perhaps because of anatomical variation.