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최용석,김규태,황의환 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.36 No.3
The use of computed tomography for dental procedures has increased recently. Cone beam computed tomography (CBCT) systems have been designed for imaging hard tissues of the dentomaxillofacial region. CBCT is capable of providing high resolution in images of high diagnostic quality. This technology allows for 3-dimensional representation of the dentomaxillofacial skeleton with minimal distortion, but at lower equipment cost, simpler image acquisition and lower patient dose. Because this technology produces images with isotropic sub-millimeter spatial resolution, it is ideally suited for dedicated dentomaxillofacial imaging. In this paper, we provide a brief overview of cone beam scanning technology and compare it with the fan beam scanning used in conventional CT and the basic principles of currently available CBCT systems.
산소이온전도체 CaO 안정화 ZrO₂에의 Al₂O₃첨가효과
최용규,이주신 경성대학교 생산기술연구소 1997 생산기술연구지 Vol.4 No.-
The effects of Al₂O₃additions on sintering behavior and electrical conductivity of 13 mol% CaO-stabilized ZrO₂were systematically investigated from the following aspects: the variation in sintering density, the variation in grain size, the forms and existence position of Al₂O₃in ZrO₂and the variation in resistance. The powders of composition [??, (×=0, 0.01, 0.02, 0.03, 0.05)] were synthesized by the coprecipitation method. The synthesized powders were uniaxially pressed at 1000㎏/㎝²,and the pressed pellets were sintered at 1400℃ for 5hr. According to the result of SEM and XRD analysis, the solubility limit of Al₂O₃on 13 mol% CaO-stabilized ZrO₂can estimated to be nearly 1 mol%. Addition of 1 mol% Al₂O₃causes the increment on grain growth, and it brings the increment of the sintered density. The electrical conductivity is also increased with increasing Al₂O₃content up to 1 mol%. It is suggested that soluble and insoluble Al₂O₃have opposite effects on sintering behavior and electrical conductivity.
최영천,김세현,최원규 尙志大學校 生産技術硏究所 1998 生産技術論叢 Vol.- No.4
Within the Hyeongseong area, Kangwondo Province, occur many gold-silver-bearing hydrothermal vein deposits. Geologic setting, ore occurrence, mineral paragenesis, and genetic environments of Au-Ag quartz vein deposits in the Sanjeon mine, a representative mine in the area, are elucidated in this study. Gold-silver mineralization of the Sanjeon mine occurs in epithermal quartz veins which filled fault fractures in quartz porphyry. Ore mineralogy is simple, being composrd of base-matal sulfides (mainly sphalerite, pyrite, galena, and arsenopyrite) and Au-Ag minerals [electrum (24∼40 atomic % Au), argentite, native silver, and pyrargyrite)]. Fluid inclusions show that mineralization was mainly formed at a relatively low and narrow temperature range (150°∼ 250℃). Fluid pressures were about 70bars, corresponding to a hydroststic head of about 600m. Gold deposition occurred mainly at temperature of 210°∼ 250℃ as a combined result of the decreases of temperature and activity of H2S and the increase of pH, due to the boiling of ore fluids. Later deposition of silver minerals such as native silver was mainly a result of cooling and dilution of ore fluids at a temperature range of 150° to 190℃, due the inundation of circulating meteoric water.
하악 제3대구치와 하악관과의 위치관계에 대한 파노라마 방사선사진과 cone beam형 전산화단층영상의 비교
최형수,김규태,최용석,황의환 대한구강악안면방사선학회 2008 Imaging Science in Dentistry Vol.38 No.3
Purpose : To assess the diagnostic accuracy and value in an imaging technique field through the comparison of cone beam computed tomography and conventional panoramic radiography in assessing the topographic relationship between the mandibular canal and impacted third molars. Materials and Methods : Participants consisted of 100 patients offered the images through cone beam computed tomography and panoramic radiography. PSR-9000 Dental CT system (Asahi Roentgen Ind. Co., Ltd, Japan) was used as the unit of cone beam computed tomography. CE-II (Asahi Roentgen Ind. Co., Ltd, Japan) and Pro Max (Planmeca Oy, Finland) were used as the unit of panoramic radiography. The images obtained through panoramic radiography were classified into 3 types according to the distance between mandibular canal and root of mandibular third molar. And they were classified into 4 types according to the proximity of radiographic feature. The images obtained through cone beam computed tomography based on the classification above were classified into 4 types according to the location between the mandibular canal and the root and were analyzed. And they were classified into buccal, inferior, lingual, and between roots, according to the location between mandibular canal and root. The data were statistically analyzed and estimated by χ²-test. Results : 1. There was no statistical significance according to 3 types (type l, type ll, type lll) through CBCT. 2. The results of 4 types (type A, type B, type C, type D) through CBCT were as high prevalence of CBCT 1 in type A, CBCT 2 in type B, CBCT 3 in type C, and CBCT1 in type D and those of which showed statistical significance (P value=0.03). 3. The results according to location between mandibular canal and root through CBCT recorded each 49, 25, 17, 9 as buccal, inferior, lingual, between roots. Conclusion : When estimating the mandibular canal and the roots through the panoramic radiography, it could be difficult to drive the views of which this estimation was considerable. Thus it is required to have an accurate diagnostic approaching through CBCT that could estimate the location between mandibular canal and roots.
Semiclassical Analysis for O + Pb Elastic Scattering at E=216.6 and 312.6 Mev
최치규,현남규,김용주,홍성락 제주대학교 1992 논문집 Vol.34 No.-
실험실계에서의 입사핵?? 에너지가 216.6과 312.6 MeV이고 표적핵?? 인 탄성산란에 대한 실험데이타를 수정된 Glauber모델을 사용하여 분석하였다. 계산된 결과들은 실험데이타와 좋은 일치를 보여주었다. .
C 의과대학에서 문제강의에 대한 학생들의 직접평가가 강의개선에 미친 영향
김석용, 이상진, 최재운, 김승렬, 김용대, 배성은, 김영규 충북대학교 의과대학 충북대학교 의학연구소 2012 忠北醫大學術誌 Vol.22 No.1
연구목적: 팀티칭에 근거한 통합강의는 최근 대부분의 의과대학에서 시행되는 강의형태이다. 그러나 기 존에 사용되고 있는 온라인 강의평가 방식은 이러한 강의 특성에서 나타나는 문제점을 파악하기 힘든 점이 있다. 본 대학에서는 팀티칭에 의한 통합강의에서 문제강의를 직접적으로 파악하는 ‘문제강의 직 접평가지’를 개발하였다. 본 연구의 목적은 새로이 개발된 문제강의 직접평가지가 강의개선에 끼친 영 향력을 알아보고자 하는 것이었다. 연구방법: 2007년 2학기부터 2009년 2학기까지 충북대학교 의과대학 1, 2학년을 대상으로 문제강의 직접평가지에 의한 강의평가를 실시하였다. 평가지 질문 중에서 두 가지 객관식 질문에 대한 답변을 분 석대상으로 선택하였다. 질문은 첫째, ‘가장 유익하고 도움이 많이 되었던 강의들은 무엇입니까?’와 둘 째, ‘가장 어렵거나 이해하기 힘들었던 강의들은 무엇입니까?’였다. 강의평가를 실시한 강좌들 중에서 2 년 이상 연속적으로 강좌구조와 평가지의 객관식 질문 형식이 변하지 않은 14개의 강좌를 분석대상으로 하였다. 각각 연도의 평균 긍정비율을 다른 연도의 것과 카이제곱 검정 방법을 사용하여 비교하였다. 결과: 14개의 강좌 중에서 시작연도와 마침 연도 간에 긍정비율이 증가된 경우는 13개 강좌였다. 그 러나 통계적으로 의미가 있는 경우는 5개 강좌에서 나타났다. 결론: 문제강의 직접평가지에 의한 문제강의를 판별해 내는 방법은 단기간에 통합강좌의 개선에 효과 적이다.