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대형 문화시설이 주변지역에 미치는 영향에 대한 탐색적 연구
정환석(Jeong, Hwan-seok),정영법(Jeong, Young-beop),유우상(Yoo, Uoo-sang) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
The purpose of this study is to investigate the influence of large cultural facilities on the surrounding area. The National Asian Culture Center(ACC) is located in Dong-gu, Gwangju Metropolitan City. Donggu, severely suffered in the last fifteen years by economic and social declining due to the hollowing out phenomena, is the place where the expectation effect of the ACC is most directly received. This paper has examined this influence before and after the opening of the ACC. From the social, economic, and cultural point of view, population, official land price, building transaction volume, number of businesses, local events, and street landscape were analyzed. As a result, the official land value of the surrounding area, especially in the residential area was raised by the opening of the ACC. When it comes to land use, the commercialization has been the primary change, consequently the number of cultural industries did not increase greatly due to the influence of gentrification
김영호,정환석,허경회,이원진,허민석,이삼선,최순철,Kim, Young-Ho,Jeong, Hwan-Seok,Huh, Kyung-Hoe,Yi, Won-Jin,Heo, Min-Suk,Lee, Sam-Sun,Choi, Soon-Chul 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.1
Purpose : We want to identify the appearance of the buccolingual root dilaceration teeth in the panoramic views and specify the characteristics of these teeth. Materials and Methods : One thousand-six patients were examined on the basis of both panoramic and CT image criteria. We diagnosed and excluded certain teeth from the samples; both prosthodontic or pathologic lesion appearing teeth and mesiodistally dilacerated ones. We meticulously discerned buccolingually dilacerated teeth in the CT images and total 48 samples were selected. The degree of severity in dilaceration was standardized by 2 types of criteria. The samples were differentiated into 3 groups and again categorized into six types showing from the panoramic views: irregular view on the root apex area, clear blunt on the root tip, stepping on root tip, double lamina dura or double tip, arrow-target shaped root, bull's eye, normal view. Results : The types of teeth selected from total 48 buccolingual root dilaceration samples were mandibular first and second molar, premolars, canines, and lateral incisors. The direction of dilaceration was an even percentage to each buccal and lingual side for most selected teeth, however, that of both canines and lateral incisors were directed in almost a buccal side. In the panoramic views, the root types of the buccolingually dilacerated teeth were irregular view on the root apex area, clear blunt on the root tip, stepping on root tip and normal types were almost always normal view. The more severity in dilareated degree, the more chances of observation in the panoramic views were clear blunt on the root tip and stepping on root tip. Conclusion : As observed in the shape of stepping on root tip or double lamina dura in the panoramic views, there can be much more probability to diagnose as a buccolingually dilacerated root.
노정준,최보람,정환석,허경회,이원진,허민석,이삼선,최순철,Noh, Jeong-Jun,Choi, Bo-Ram,Jeong, Hwan-Seok,Huh, Kyung-Hoe,Yi, Won-Jin,Heo, Min-Suk,Lee, Sam-Sun,Choi, Soon-Chul 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.2
Purpose : The research was performed to predict the three dimensional relationship between the impacted mesiodens and the maxillary central incisors and the proximity with the anatomic structures by comparing their panoramic images with the CT images. Materials and Methods : Among the patients visiting Seoul National University Dental Hospital from April 2003 to July 2007, those with mesiodens were selected (154 mesiodens of 120 patients). The numbers, shapes, orientation and positional relationship of mesiodens with maxillary central incisors were investigated in the panoramic images. The proximity with the anatomical structures and complications were investigated in the CT images as well. Results : The sex ratio (M : F) was 2.28 : 1 and the mean number of mesiodens per one patient was 1.28. Conical shape was 84.4% and inverted orientation was 51.9%. There were more cases of anatomical structures encroachment, especially on the nasal floor and nasopalatine duct, when the mesiodens was not superimposed with the central incisor. There were, however, many cases of the nasopalatine duct encroachment when the mesiodens was superimpoised with the apical 1/3 of central incisor (52.6%). Delayed eruption (55.6%), crown rotation (66.7%) and crown resorption (100%) were observed when the mesiodens was superimposed with the crown of the central incisor. Conclusion : It is possible to predict three dimensional relationship between the impacted mesiodens and the maxillary central incisors in the panoramic images, but more details should be confirmed by the CT images when necessary.
IGTO 박막 트랜지스터의 채널층 두께에 따른 양성자 빔 조사의 영향
황성현(Seong-Hyun Hwang),신민규(Min-Gyu Shin),이동호(Dong-Ho Lee),차현석(Hyun-Seok Cha),정환석(Hwan-Seok Jeong),김대환(Dae-Hwan Kim),권혁인(Hyuck-In Kwon) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
In this study, we investigated the effects of film thickness (t<sub>ch</sub>) on the radiation damage of indium-gallium-tin oxide (IGTO) thin films and radiation tolerance of high-mobility IGTO thin-film transistors (TFTs). The radiation tolerance of the TFTs was evaluated using a 5MeV proton beam at a fixed dose of 10<sup>13</sup> cm<sup>-2</sup>. Using t<sub>ch</sub> values of 12, 27, and 42 nm, the IGTO TFT with the 12nm thick channel layer exhibited the best electrical performance and radiation tolerance. The radiation tolerance significantly decreased as t<sub>ch</sub> increased. To elucidate the mechanism responsible for the observed phenomena, the physical and chemical properties of the IGTO thin films with different values of t<sub>ch</sub> were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and atomic force microscopy before and after the proton beam irradiation
실리카가 침적된 페리에라이트 촉매에서 1-부텐 골격이성화반응
김종호,서곤,정환석 全南大學校 觸媒硏究所 1996 觸媒硏究 論文集 Vol.18 No.-
The effects of activity of acid sites on the external surface and the pore structure of ferrierite catalyst on the conversion of 1-butene and the selectivity ot the skeletal isomerization was investigated over the modified ferrierite. The chemical vapor deposition method using silicone tetramethoxide was inactivated only the acid sites on the external surface of ferrierite catalyst. In the case of this catalyst, the conversion of 1-butene an the selectivity to isobutene were not varied. On the other hand, in the case of the ferrierite deposited with silical in the pore by a cold plasma polymerization method using siloxane, the conversion of 1-butene was significantly decreased, but the selectivity to isobutene was increased by the deposition of a little amount of the silica. However, the selectivity to isobutene was decreased with increasing the amount of silica. It can be said that the much amount of deposited silica in the pore is diminish the effect of the pore structure of ferrierite catalyst, followed by the decrease in selectivity to isobutene.
회전변위와 천공을 포함한 측두하악관절 내장증 상태와 임상적 특징간의 상호관계
유동수,정환석 大韓口腔顎顔面 放射線學會 1998 Imaging Science in Dentistry Vol.28 No.1
This study was designed to reveal the correlationship between the internal derangement state of TMJ and clinical characteristics including pain and mandibular dysfunction. One hundred and twenty five subjects with TMJ signs and symptoms were chosen for two years. The level of pain and madibular dysfunction were evaluated by Visual Analog Scale(VAS) and Craniomandibular Index(CMI). The diagnostic categories of TMJ internal derangement were determined by arthrography and they included normal disc position, anterior disc displacement with reduction(ADDR), rotational disc displacement with reduction(RDDR), anterior disc displacement without reduction(ADDNR), and rotational disc displacement without reduction (RDDNR). Also disc perforation was used as a criteria to divide the diagnostic subgroups. The obtained results were as follows; 1. The patient distribution of each group was 5 in normal disc position(4%), 40 in ADDR(32%), 30 in RDDR(24%), 34 in ADDNR (27%), and 16 in RDDNR(13%). 2. Perforation was observed in 8% of ADDR, 10% of RDDR, 32% of ADDNR, and 19% of RDDNR. 3. CMI of non-reduction group was higher than that of reduction or normal group(p<0.05), but VAS showed no significant difference. 4. CMI of perforation group was higher than that of non-perforation group in reduction group (p<0.05). 5. There were no significant differences of CMI and VAS between anterior disc displacement group and rotational disc displacement group in both reduction and non-reduction group. 6. CMI of RDDNR group was higher than that of RDDR group (p<0.05). 7. There were no significant difference of CMI and VAS between bilateral involvement group and unilateral involvement group(p>0.05).