열린교육에 대응하는 초등학교 교육환경의 계획기준 연구 : Unit & Block Plan과 Space Program을 중심으로

李承俊,金興起 三陟大學校 2001 論文集 Vol.34 No.2

The purpose of this paper is to examine the educational environments of elementary school among the changes of 21st century. The schools accommodation can be considered under two condition, that is open education and 7th curriculum. For this point, this study is aimed at the first stages analysis of unit plan and space program. Findings of the study are followings ; First, planning of unit class room in Korean open plan Elementary School(above 3.0m² per one person). Second, for the general basis of the elementary school planner, Planning Criteria are suggested by informations/guidelines in the beginning of the design process. Third, proposal about typical space programming(optimum areas of facilities ; 9.0m²per one person)

만정 뇌경막하혈종에서 술전 CT음영 및 천두폐쇄배액술후 배액량과 재발과의 상관관계에 대한 연구

임동준,박윤관,정용구,김봉룡,정흥섭,이기찬,이훈갑,서중근 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.10

수종 치과재료의 제I급 와동에서의 변연 누출에 관한 실험적 연구

이선희,손흥규,최형준 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.1

Microleakage is a problem of all filling materials of losted teeth structure and is clinically undetectable. Because marginal leakage may be responsible for pulp irritation, pulp inflammation, necrosis and recurrent caries, it is essential to prevent and control it. For the evaluations of microleakage of various class I filling materials, 175 extracted teeth were filled with amalgam, light curing composite resin, glass inomer cement, IRM and Fermit-N. After thermocycling, speciemens were placed in 1% methylene blue dye solution for 24 hours in an incubator set 37℃. The teeth were sectioned at filling body center and margin and degree of dye penetration was observed with a stereomicroscope. The following results were obtained. 1. Light cured composite resin has the excellent results and microleakage is increased in the order of amalgam, IRM, Fermit-N, glass ionomer cement.(SAS-6.0 system) and there was a statistically significancy in marginal leakage for each filling materials.(Kruskal-Wallis analysis, P<0.05) 2. Microleakage of the center and margin was statistically insignificant (Mann-Whitney analysis P<0.05) 3. There was less microleakage for amalgam than light cured composite resin but was statistically insignificant (Mann-Whitney analysis, P<0.05) and also showed less marginal leakage for Fermit-N compared to glass ionomer cement but also was statistically insignificant. (Mann-Whitney analysis, P<0.05).

후방순환계 뇌동맥류의 임상분석

임동준,이훈갑,정흥섭,김봉룡,권택현,이기찬,서중근 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.11

초음파 진동판의 표면조도에 따른 분무특성에 관한 연구

이준백,전인곤,전흥신 경희대학교 레이저공학연구소 2000 레이저공학 Vol.11 No.-

The purpose of this study is to compare the SMD(Sauter mean diameter) according to surface roughness of vibrant plates. Liquid film thickness is measured for explanation how to concern ultrasonic atomization. Ultrasonic waves is used for vibration. Immersion liquid method is used for the measure of SMD and liquid film thickness is measured using of point needle method. Distilled water and gasoline fuel are used to liquids. Supplied liquid flow rates are 18∼296cc/min. Centerline average roughness of vibrant plates are 0.5, 2.0, 4.7, 9.5㎛ and diameter of vibrand plate is 60mm. The Vibrant plate with 70, 80mm diameter are used for verify practical limit of horn diameter. In result, good atomization of liquid is obtained in widen flow rates. The mean droplet size is increased in orders of 4.7, 2.0, 9.5, 0.5㎛ surface roughness. Distilled water has a big mean droplet size than gasoline fuel below 78cc/min flow rate but above 78cc/min flow rate, distilled water has a small mean droplet size than gasoline fuel. According to 0∼20.4W ultrsonic power, liquid film changes are measured. Liquid film thickness are fluctuated in 18, 196cc/min according to capillary wave and cavitation. 25mm diameter of horn has lower liquid film thickness because of big vibration of horn.

하악 중절치에 발생한 치내치

이정진,최병재,이제호,최형준,손흥규,김성오 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.2

치내치(dens invaginatus)는 형태분화기에 비정상적인 치아발생이 원인으로 경조직이 석회화되기 전에 법랑질 상피가 함입되어 생기는 드문 치아 기형이다. 치내치의 발생 빈도는 0.04-10%이고 대부분이 상악에서 발생하며 특히 상악 측절치에서의 빈도가 높고 하악에서는 드물게 발생한다고 보고되었다. 치내치는 우상치나 왜소치,쌍생치,과잉치,상아질 형성부전증과 같은 형태 이상과 연관되어서 나타나는 경우도 있다. 치내치는 함입된 정도에 따라 3가지로 분류할 수 있고 다양한 해부학적 변이를 보이며,이러한 기형은 미생물의 침입을 용이하게 하므로 치아우식증과 치수감염 및 괴사의 위험성을 높인다. 치수조직에 문제가 생긴 경우 근관의 복잡한 해부학적 형태 때문에 근관치료가 매우 어려우므로 조기에 진단하여 치료하는 것이 중요하다. 본 증례들은 하악 중절치에 드물게 발생하는 치내치를 가진 환아에 대한 것으로 하악 중절치에서의 치내치 유병율과 치료에 대한 고찰을 하였기에 이를 보고하는 바이다. Dens invaginatus is a rare malformation resulting from invagination of the enamel before calcification has occurred. It is mostly found in permanent maxillary lateral incisors and mandibular teeth are rarely affected by this anomaly. The malformation is estimated to affect between 0.04 % and 10 % of people and has been associated with other abnormalities such as taurodontism, microdontia, gemination and dentinogenesis imperfects. Dens invaginatus is classified in three types with respect to the depth of invaginatus and has a broad spectrum of morphologic variations. Invagination frequently allows the entry of irritants and microorganism, which usually lead to caries, pulp infection and pulp necrosis. Root canal treatment on such invaginatus tooth may present severe problems because of its complex anatomy of the tooth. Therefore, the early diagnosis of such malformation is crucial and preventive approach is strongly recommended.

척수원추내에 발생하여 외장성 성장을 보인 낭종성 기형종 -증 례 보 고-

임동준,박윤관,김애리,정흥섭,이기찬,이훈갑,서중근 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.10

급성기 뇌지주막하출혈에서 Three-Dimensional Computed Tomographic Angiography (3-D CTA)의 유용성

임동준,이훈갑,김봉룡,정흥섭,정용구,이기찬,서중근 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.12

치아 이상의 발생 빈도와 양상에 관한 연구

이제호,손홍규,전승준,최형준 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.2

An object definition of the anomaly is not avaliable and most investigators define the term differently or fail to describe their criterion.Because dental anomaly may lead to many complications,early detection and diagnosis of dental anomalies are essential steps in the evaluation of the child patient and in treatment planning.These procedures require detailed medical and dental histories,through clinical examination and the use of radiographs.So,this study was designed to find out the prevalece of dental anomalies.The clinical and roentgenographic examination was undertaken for 8,054 children at age from 0 to 15 years and statistical analysis was done.The results were as follows: 1.Among the examined subjects 2,134 subjects(26.5%) showed dental anomalies.The prevalance of individure dental anomalies were as as follows:Supernumerary teeth 15.6% congenitally missing teeth 6.6%,fusion 2.2%,odontoma 0.35%,microdontia 1.2%,macrodotia 0.05%,gemination 0.22%,talon cusp 0.36%,dens evaginatus 0.24%,dens invaginatus 0.15%,dilaceration 0.27%,taurodontism 0.09%,abnormal tooth position 1.7%,natal $ neonatal teeth 0.92%,amelogenesis imperfecta 0.01%. 2.Significant correlations between the groups with individual dental anomalies were as follows:between groupⅠand other groups,there was nagative correlation,especially groupⅠ and groupⅡ.And the correlation coefficient between male and female showed differences. 3.For the supernumerary teeth group,the prevalence of male was higher than female(p<0.001).While for the congenitally missing teeth,macrodontia,microdontia,abnormal tooth position group,the prevalence of female was greater than male(p<0.001). 4.For the congenitally missing teeth group,the mandibular primary lateral incisor showed the highet incidence in primary dentition,while mandibular lateral incisor in permanent dentition.In the mandible(72.5%),this site showed higher prevelence than in maxilla.In this case with deciduous congenitally missing teeth,the prevelence of successive permanent congenitally missing teeth was about 33.9%,the incidence was highet in mandibular lateral incisors. 5.Most supernumerary teeth existed on middle area and showed inverted position and unerupted state.In addition,supernumerary teeth showed higher incidence on maxilla(99.3%). 6.In the case with deciduous fused teeth,the prevelence of successive permanent congenitally missing teeth was 39.9%,while that of successive permanent fused teeth was 2.7%.And the highet rate of the prevalence(40.3%) appeared in fusion of mandibular deciduous lateral incisor and canine. 7.In the case of odontoma,the prevelence was higher in maxilla(78.6%) and anterior region(82.7%) the mandible and posterior region.

평면연삭버어의 가공조건에 의한 영향

이광영,옥철호,서영백,박흥식,전태옥 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2

This study has been carried out to prevent and decrease the grinding burr under various working conditions; number of grinding passes, depth of cut, hardness of the materials and work speed. Grinding wheel is WA grinding wheel and workpieces are SM45C, SS41, SCM23 and STS 304. The results of tained from this study are as follows; The length of gringing burr increased with increasing grinding passes and it has nothing to do with materials and heat treatment. The size of grinding burr increased with increasing grinding depth and feed speed. The size of grinding burr decreased with increased cross setion and of workpiece. According as the hardness of material was increased, the width of grinding burr decreased conspicuously owing to suppression of plastic zone of burr root part.