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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)
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.
음성 인식 기술을 활용한 채점자 엄격도 반영 및 유창성 측정 타당성
최인철(Choi Inn-Chull) 한국외국어교육학회 2004 Foreign languages education Vol.11 No.2
Serious inherent problems with practicality, intra-rater and inter-rater reliability overshadow the known positive washback effects of performance assessment in language education. In particular, it has been welldocumented that inter-rater reliability poses a serious threat to overall test validity, since individual raters necessarily measure performance according to their own subjective severity criteria in language proficiency. However, language testing has witnessed a remarkable series of breakthroughs in performance assessment during the recent advent of the information era. One such breakthrough utilizes state-of-the-art automatic speech recognition (ASR) technology for oral proficiency interviews(OPI). Granting that current forms of ASR technologies may not produce results with the reliability needed to accommodate highstakes standardized test administration, they do offer aid in approaching the thorny issues of practicality and inherent human inter-rater subjectivity. Accordingly, this paper is intended to investigate the degree to which ASR-based OPI ratings match similar human-conducted OPI ratings by employing correlational analyses on the basis of degrees of rater severity. Furthermore, this paper attempts to explore a method of enhancing the robustness of ASR-based OPI ratings which capitalizes on suprasegmental information by measuring fluency based principally on the test-takers’ response time length.
최인철 ( In Cheol Choi ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.5
Several clinical studies suggest substantial limitations of currently available positive inotropic substances, including beta1-adrenoceptor agonists and phosphodiesterase III inhibitors. Levosimendan, a myofilament calcium sensitizer with inotropic effects, increases myocardial performance without substantial changes in oxygen consumption and with neutral effects on heart rhythm. In addition, levosimendan has vasodilatory effects that are achieved by stimulation of adenosine triphosphate-dependent potassium channels. This review article briefly discusses the pharmacology of levosimendan and evaluates current available evidence to assess the safety and efficacy of levosimendan. (Korean J Anesthesiol 2006; 51: 519~27)
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.
최인철(Choi, In-Cheol) 한국조형디자인학회 1998 조형디자인연구 Vol.1 No.-
The main problem of current ceramic tourist folk-craft Goods in Kyungju area is lack of local character in the products. To solve this problem, it is needed to make it characterized, and increase locality in products through symbolizing the local character. 1. This study explores the problems of manufacturing shops and products through the examination of the present conditions. 2. The purpose of this study is to present some suggestions for how to apply the local characteristic materials to the development of product design by finding out them from folk and cultural legacies.