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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.
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정호균,박형준 한국CDE학회 2019 한국CDE학회 논문집 Vol.24 No.3
Infrared (IR) images obtained from IR sensors are usually less noisy and more robust to illumination changes than RGB images. In this paper, we propose an accurate and robust method for feature points-based object tracking using IR images in augmented reality (AR) environments. Using a stereo camera consisting of an RGB camera and an IR camera, the method captures RGB and IR images of an IR marker composed of a small number of IR LED points randomly placed on a flat square. The method adopts a multi-layer thresholding algorithm devised for robustly detecting the centers of IR LED dots in each IR image. In addition, it makes good use of locally likely arrangement hashing (LLAH) in order to describe and recognize the IR LED centers as feature points, which are used to compute the transformation between the IR camera and the IR marker frames. We have implemented the proposed method and conducted various experiments to show its quality and advantages over previous methods based on marker or feature tracking in RGB images. We expect that it can be very useful where RGB imagebased tracking methods do not work well due to image noises and light conditions.
정호균,최우혁 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Although salt-in-polymer systems have been extensively studied using various polymeric matrices and salts, the majority of the polymer/Li salt mixtures reported have low lithium transference number (less than 0.5). In order to overcome such a low transference number, of particular interest are single-ion conductors where anions are covalently linked to polymers, thereby only cations are mobile. We develop a single-ion conducting silica aerogel, where poly acrylic acid having lithium countercation is anchored covalently, by sol-gel reaction and radical polymerization. Its ionic conductivity and morphology are investigated using impedance measurement and FE-SEM.