Skin entrance dose for digital and film radiography in Korean dental schools

Cho, Eun-Sang,Choi, Kun-Ho,Kim, Min-Gyu,Lim, Hoi-Jeong,Yoon, Suk-Ja,,Kang, Byung-Cheol 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.4

Purpose : This study was aimed to compare skin entrance dose of digital radiography with that of film radiography and to show the dose reduction achievement with digital systems at 11 dental schools in Korea. Materials and Methods : Forty six intraoral radiographic systems in 11 dental schools were included in this study. Digital sensors were used in 33 systems and film was used in 13 systems. Researchers and the volunteer visited 11 dental schools in Korea. Researchers asked the radiologic technician (s) at each school to set the exposure parameters and aiming the x-ray tube for the periapical view of the mandibular molar of the volunteer. The skin entrance doses were measured at the same exposure parameters and distance by the technician for each system with a dosimeter (Multi-O-Meter : Unfors instruments, Billdal, Sweden). Results : The median dose was 491.2 μGy for digital radiography and 1,205.0 μGy for film radiography. The skin entrance dose digital radiography was significantly lower than that of film radiography (p<0.05). Conclusion : Fifty-nine percent skin entrance dose reduction with digital periapical radiography was achieved over the film radiography in Korean dental schools.

40세 이하 관상동맥 질환자에서 장기적 임상 관찰

이승욱,정명호,박종철,박형욱,조상희,김원,김계훈,이상현,강경태,조장현,김남호,김건형,안영근,조정관,박종춘,강정채 全南大醫大 2001 전남의대학술지 Vol.37 No.2

폐결핵의 조기진단에 있어서 이중중합효소연쇄반응법의 유용성

조성란,최영진,김용훈,이철세,김영창,김휘준 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.2

Background: Pulmonary tuberculosis is a great public health problem in Korea. Early detection of Mycobacterium tuberculosis (M. tuberculosis) in clinical samples becomes more and more important in the control of tuberculosis. Recently, molecular methods have been applied to early detection of M. tuberculosis. Methods: To elucidate the effectiveness of nested polymerase chain reaction (PCR) in early diagnosis of pulmonary tuberculosis, we peformed Acid-fast bacilli (AFB) stain, AFB culture, and nested PCR on 84 sputa. Results: 8 (9.5%) specimens were positive by AFB stain, 17 (20.2%) by AFB culture, and 15 (17.9%) by nested PCR. Using AFB culture as standard method, the sensitivity of AFB stain and nested PCR was 47.1% and 82.4%, respectively. The specificity of AFB stain and nested PCR was 100% and 98.5%, respectively. Conclusions: Nested PCR was more sensitive than AFB stain and had shorter processing time(24-48hrs) than AFB culture. So it may be effective to use nested PCR in order to detect M. tuberculosis when AFB smear Is negative.

Testicular Morphology of Hanwoo bull at 7 to 17 Months of Age

Sung-Sik Kang,Sang-Rae Cho1,Ui-Hyung Kim,Kim Hyeong-Cheol,Chung Ki-Yong,Jang Sun-Sik,Si-Dong Kim 한국동물생명공학회(구 한국동물번식학회) 2016 발생공학 국제심포지엄 및 학술대회 Vol.2016 No.10

하악골에 발생된 Low grade 골육종:증례보고

조현이,정종철,김호성,최재욱,성대경,서지훈,김성범,이계혁 大韓顎顔面成形再建外科學會 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.1

Osteosarcoma is a primary malignant tumor arising most often in the long bone, but rare in jaw bone. Especially osteogenic sarcoma of the mandible is a rare tumor, comprising less than 0.5% of all head and neck tumors. Osteosarcoma occurs cheifly in young persons, and presenting very survival rates. Histopathologically this tumor can be classified three types, osteoblastic, fibroblastic, chondroblastic and classified from low grade to high grade by anaplasia or mitosis of the tumor cells. Sometimes, the exact diagnosis of osteosarcoma is difficult especially in low grade osteosarcoma, even if clinical or radiographical findings suggest to osteosarcoma. So suspcious to malignant bone tumor in clinical or radiological findings, biopsy should be taked from deep portion and multiple area, and sharing the patient history and radiographs with pathologist will assist in the development of the diagnosis. We report a case of low grade osteosarcoma on the mandible initially difficulty in accurate diagnosis. The patient visited our hospital for routine dental treatment but radiographic findings displayed ill-defined radiolucency with osteoid formation on the mandible. Final diagnosis was difficulty in initial biopsy but subsequent biopsy taked from deep portion presented infiltrative growth and mitosis of the tumor cell in some area with small osteoid bone formation, so we could reach final diagnosis as low grade sarcoma. We treated this patient with bloc resection of the mandible and immediate reconstruction with iliac corticocancellous block.

住宅團地의 外部空間利用行態에 關한 硏究

趙南勳,李相喆 順天大學校 1985 論文集 Vol.4 No.1

This paper made a survey and an analysis of, a) the demand of residents upon the mode of out-door space formation, b) the relation between communication behaviour and out-door space, c) the correlation between an offer of opportunity for establishing friendship and the use of out-door space, on two housing complex. The results are as follows: a) out-door space in housing complex does not give friendly feeling to the residents, b) it needs more space and facilities, c) the danger of space limits various utilization of it, d) the mode of space formation is not accommodated to private demands, e) the formation of friendship is difficult because of residents propensity to move, f) communal soildarity is weak because of the lack of chance for establishing friendship. For a remedy for these problems, I suggested, a) the way to reconsider the utilization of public space, b) the way to secure and offer private out-door space, c) the way to manage space effectively and to offer an artificial opportunity.

전치부 치조골 폭경과 안면 골격 형태의 상관성에 관한 연구

조영진,김상철 원광대학교 생체재료·매식연구소 1998 원광생체재료·매식 Vol.7 No.1

Delineating the limits of orthodontic treatment in adults is important when planning treatment especially in borderline orthodontic-surgical cases. The labial and lingual cortical plates at the level of the incisor apex may represent the anatomic limits of tooth movement. Cephalometric films of 180 adults were measured to determine the width of alveolar bone anterior and posterior to the incisor apex in each arch. The variables were statistically analyzed to compare the difference in accordance to skeletal patterns. The results were as follows: 1. Thin alveolar widths were found lingual to the mandibular incisors in Class Ⅲ groups. 2. Thin alveolar widths were also found both labial and lingual to the mandibular and maxillary incisors in groups of high SN-MP angle individuals. 3. Norms for alveolar width in the Class I average group were presented.

全南住民에 있어서 惡性腫瘍의 統計的 觀察 (第2報)

曺圭赫,柳柱容,尹康爀,鄭相愚,梁東旭,李珉撤,崔燦 全南大醫大 1983 전남의대학술지 Vol.20 No.4

Ⅱ급 부정교합에서 혀, 설골의 위치 및 기도 크기에 관한 연구

조진형,김상철 원광대학교 생체재료·매식연구소 1999 원광생체재료·매식 Vol.8 No.1

The purpose of this study was to evaluate the position of tongue and hyoid bone and the dimension of airway in class Ⅱ malocclusion. Lateral cephalogram(63 patients : 33 in male, 30 in female, average age 23.2 years) taken in natural head position(NHP), were traced and measured about the head posture, the position of the tongue and the hyoid bone and the dimension of airway, using the horizontal and vertical reference lines The angle of mandibular plane to SN plane was employed to classify samples into groups of hypodivergent and hyperdivergent. Craniofacial measurements were compard between hypodivergent group and hyperdivergent group The results were as follows; 1. The craniocervical angle was smaller in the hypodivergent group than in the hyperdivergent group. 2. The dimension of nasopharyngeal airway was smaller in the hyperdivergent group than the hypodivergent group. But the dimension of oropharyngeal airway was of no significant difference. 3. Tongue position was lower in the hyperdivergent group than in the hypodivergent group. 4. The vertical or horizontal position of hyoid bone was not distinctly different between the hypodivergent group and the hyperdivergent group.

多收性도토리의 遺傳資源과 優良種의 選拔에 관한 硏究

趙顯瑞,李喆浩,安相烈 진주산업대학교 1998 論文集 Vol.37 No.-

상수리나무, 굴참나무, 졸참나무, 갈참나무, 신갈나무 및 떡갈나무를 중심으로 우수한 형질을 나타내는 48개체 중 선발된 수종의 형질 특성을 농촌진흥청 원예시험장 과수조사 기준에 따라 果樹化를 위한 주요 형질인 葉長, 葉幅, 新梢長, 節間數, 新梢莖, 果重, 과종경, 과횡경 및 熱期를 각 지역별로 조사한 결과를 요약한다. 가. 선발 1년차 1. 굴참나무의 개체선발 결과 평균 흉고직경이 21㎝, 수고10m, 수관폭 4m 정도이고 수령은 20-25년생으로 그 중 우량종으로 개체선발된 굴참나무는 흉고직경 23㎝, 수고 12m, 수령 25년생이었으며, 떡갈나무는 평균 흉고직경 20㎝, 수고 8-9m, 수관폭 4m, 수령 20년생으로 그 중 우량종으로 개체선발된 떡갈나무는 흉고직경 20㎝, 수고 8m, 수령 20년생으로 수간이 곧고 수관폭이 4m 정도였다. 2. 졸참나무는 평균 흉고직경 25㎝, 수고 13m, 수관폭 4m, 수령 25년생 정도로 그 중 우량종은 흉고직경 25㎝, 수고 10m, 수령 20년생으로 수간이 곧고 수관의 폭은 5m였다. 3. 농가 탐문조사에 의한 개체선발 결과 우수종의 신초장 생육은 함양선발종Ha-6, 7, 14호가 가장 크게 신장했고, 잎의 형태는 수종별로 다양한 것으로 나타났으며, 종실의 무게는 산청선발종S-2, 9호가 7.2g과 5.7g으로 가장 무거운 것으로 나타났고, 종실의 형태는 난형, 장타원형 등 수종에 따라 다양하였다. 나. 선발 2년차 1. 상수리나무의 과중이 무겁고, 졸참나무류의 과종경이 횡경에 비해 길었으며 다수종의 평균 과중은 3.1g이고 과종경은 평균 20.4㎜인 것으로 나타났다. 2. 평균 과중이 무거운 종은 산청선발종S-2, 9호등이고, 가벼운 종은 함양선발종H-7, 19호등이며, 숙기 조사 결과 함양선발종H-4, 진주금곡면수집종JS-1, 구례종G-1 등이 조생종이고 함양종H-10, 산청종S-7, 합천종Ha-1 등은 중생종, 함양종H-7, 산청종S-3, 산청생비락면종SS-0 등은 만생종이었다. To improve the genetic resources of acorn, we selected some genetically desirable ones among a population of acorn trees. The survey sites for this study were natural forests where mother trees were growing, and where their genetic characteristics were developed through natural selection. According to the standard list of elite tree collection, 6 species(48 individual Fagaceae trees) were selected, among which 21 were in their 1st year and 27 in their 2nd year. The extension of shoot length was longest in Hamyang line(H-6, H-7 and H-14). The weight of acorn was heavier than others in Sancbung line(Sa-2 and Sa-9), and the acorn type was ovate and oblong. The average weight of individual acorn was 3.1g and its average diameter was 20.4㎜. With respect to fruit maturing period, H-4 of Hamyang variety, CK-1 of Kumgok line and G-1 of Gurye line were precocious species; H-10 of Hamyang line, Sa-7 of Sancbung line and WH-1 of Hapcbun line were intermediate ripening species; H-7 of Hamyang line, Sa-3 of Sancbung line and Ss-0 of Sangbirak line were late ripening species.