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김준식,정호균,최병덕,이기용,이준신,Kim, Jun-Sik,Chung, Ho-Kyoon,Choi, Byoung-Deog,Lee, Ki-Yong,Yi, Jun-Sin 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.4
Poly silicon TFT requires high quality dielectric film; conventional method of growing silicon dioxide needs highly hazardous chemicals such as silane. We have grown high quality dielectric film of silicon dioxide using non-hazardous chemical such as TFOS and ozone as reaction gases by APCVD. The films grown were characterized through C-V curves of MOS structures. Conventional APCVD requires high temperature processing where as in the process of current study, we developed a low temperature process. Interface trap density was substantially decreased in the silicon surface coated with the silicon dioxide film after annealing in nitrogen ambient. The interface with such low trap density could be used for poly silicon TFT fabrication with cheaper cost and potentially less hazards.
이정인(Jeoung-In Lee),황성현(Sung-hyun Hwang),정성욱(Sung-wook Jung),장경수(Kyung-Soo Jang),이광수(Kwang-Soo Lee),정호균(Ho-kyoon Chung),최병덕(Byoung-Deog Choi),이기용(Ki-Yong Lee),이준신(Jun-Sin Yi) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
Recently, poly-Si TFT-LCD starts to be mass produced using excimer laser annealing (ELA) poly-Si. The main reason for this is the good quality poly-Si and large area uniformity. We report the influence of channel length and width on poly -Si TFTs performance. Transfer characteristics of n-channel poly-Si thin film transistors fabricated on polycrystalline silicon (poly-Si) thin film transistors (TFTs) with various channel lengths and widths of 2-30 ㎛ has been investigated. In this paper, we analyzed the data of n -type TFTs. We studied threshold voltage (VTH), on/off current ratio (I<SUB>ON</SUB>/I<SUB>OFF</SUB>), saturation current (I<SUB>DSAT</SUB>), and transconductance (g<SUB>m</SUB>) of n-channel poly-Si thin film transistors with various channel lengths and widths.
鄭昊均 최신의학사 1969 最新醫學 Vol.12 No.12
To evaluate Oral Hygiene Status and its relationship with Tooth-brushing habits in rural dwellers in Korea, the author has performed interviewing and oral examination on 340 persons(male:130, female :210) of Kang Won Do province ranging from 20 to 49 years of age. For figurical detailed estimation, Oral Hygiene Index Scores by Dr. Greene's Method and Tooth-brushing Frequency were obtained from the survey findings in the respect of aging and sex respectively, lastly both scores were observed in interconnection. The results were obtained as follows: 1. With increasing age, Tooth-brushing Frequency was decreased and Oral Hygiene Index Scores were increased correspondingly. 2. Tooth-brushing Frequency was more prevalent in females than in males and Oral Hygiene Index Scores were more'in males(2.99) than in females(2.63): more poor Oral Hygiene Status in males than in females. 3. "No Tooth-brushing" persons(16.5 %) revealed higher Oral Hygiene Index Score(3.77) than the Oral Hygiene Index Score(2.23) of the "once a day Tooth-brushing" persons(47%): more poor Oral Hygiene Status in "No Tooth-brushing" persons than, in "once a day Tooth-brushing" persons. 4. The Oral Hygiene index decreases significantly with each increase in Tooth-brushing Frequency.
정호균 중앙대학교 의과대학 의과학연구소 1988 中央醫大誌 Vol.13 No.4
This report was a retrospective study on maxillofacial bone fractures of Koreans. The study was based on a series 306 patients who had been treated for maxillofacial fractures as in-patient at Hospital of Medical college of Chung-Ang University during the pried of 1982 to 1987. The results obtained are as follows; 1. The ratio of Men to Women was 4.2:1, and the incidence of facial bone fractures increased continuously year after year. 2. The age frequency was highest in Tnd decade(38.3%), and age distribution of patient ranged from 4 years to 84 years. 3. Traffic accident(40.7%), fighting(28.5%) were the most common cause of maxillofacial bone fractures. 4. The frequent locations of maxillofacial fractures were nasal bone(49.4%) and followed by the mandible(22.2%), zygoma and zygomatic arch(16.6%) and maxilla(11.8%) in order. One location fractured in 88.1% and multiple locations were involved in 11.9%. 5. In 98 patients of mandible fractures, 85(86.7) had fractures only in mandible and 13(13.3%) had another facial bone fractures. The most frequent fracture site was Symphyseal area(37.4%) and simple fracture was the most frequent in type of fractures(43.9%). Teeth or alveolar bone trauma cases were 55.5% and close reduction with intermaxillary fixation was major method of treatment(43.9%) in mandible fractures. 6. In 52 patients of Maxillary fractures, 19(36.5%) had fractures only in maxilla and 33(63,5%) had another facial bone fractures. The most predominent fracture site was Le Fort Ⅱ(28.8%), and teeth or alveolar trauma occured in 25.0% and open reduction was major method of treatment(34.6%) in maxillary fractures. 7. In 73 patients of zygoma complex fractures, 41(56.2%) had fractures only in zygoma complex and 32(43.8%) had another facial bone fractures. The most frequent fracture site was zygoma(54.8%), and observation (47.9%) and open reduction(35.6% ) were major method of treatment in zygoma complex fractures. 8. In 218 patients of nasal bone fractures, 195(89.4%) had fractures only in nasal bone and 23(10.6%) had fractures on another facial bone. Closed reduction(55.5%) and observation(28.4%) were major methods of treatment. 9. In 386 patients of facial bone fractures, the most common associated injury with facial bone fractures was head(32.7%) and eye(20.4%) injures.