Electron Cyclotron Resonance O_2 Plasma에서 증착한 규소 산화 박막의 특성

안명환,서문석,장재선,서성모,이기방,윤창주,이형재,남기석,최규현,손춘배,김용섭,강석희 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.17 No.-

규소 산화막을 ECR-CVD(electron cyclotron resonance-chemical vapor deposition) 증착방법으로 5인치 기판위에 상온에서 증착하고, 증착공정조건인 증착율, 기판온도, 마이크로파의 세기변화 및 플라즈마 혼합기체의 비에 따른 규소 산화막의 특성을 조사하였다. 또한 산화막의 구조적인 특성을 비교하기 위해 FTIR을 이용하여 ECR-CVD 증착한 산화막, RPE-CVD(remote plasma enhanced-CVD) 증착한 산화막 및 열 산화막의 stretching frequency를 측정하였다. 측정된 결과 ECR-CVD로 증착된 산화막이 구조적인 면에서 열 산화막과 거의 같음을 보였다. ECR-CVD로 증착된 산화막의 전기적인 특성을 전류-전압 및 축전-전압 측정에의하여 분석하였다. 축전된 산화막의 전기적인 특성은 산화막의 전하 밀도는 1×10 exp (11)/㎠이였고, 평균 절연 파괴 전압은 약 6 MV/㎝이다. We have grown thin films of SiO_2 at room temperature by using an ECR-CVD system and have investigated the changes in the properties of the deposited films with changes in the processing conditions such as the deposition rate, the substrate temperature, the microwave power and the plasma gas mixing ratio. We also measured the stretching frequency of three kinds of oxides, and ECR-CVD-grown oxide, a PECVD-grown oxide, and a thermally grown oxide, using FTIR analysis to compare their structural properties. The result shows that the structural properties of the ECR-grown oxide are similar to those of the thermally grown oxide. Additionally, the electrical properties of the ECR-grown oxide were investigated by using current-voltage and capacitance-voltage measurements. These electrical results indicate that the oxide charge density and the average breakdown voltage are 1×10 exp (11) ㎝^-2 and 6 MV/㎝, respectively.

그린디자인 실천을 위한 디자인요소의 적용에 대한 연구 : 전 과정 디자인개발전개를 중심으로

최대석,맹형재 홍익대학교 산업디자인 연구소 2002 미술디자인 논문집 Vol.- No.7

Hypophosphatasia 환아의 치료 증례

최병제,최형준,이제호,김기덕,박수정 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.3

1. Hypophosphatasia 는 골조직 및 치아조직의 비정상적인 석회화를 나타내는 대사장애로, 특징적구강내 소견 인 우치의 조기탈락 양상으로 치과에서 조기진단이 가능하다. 2. 본 증례에서 상악궁 확장을 동반한 의치 제작으로 심미적, 기능적으로 양호한 결과를 얻었으며, 영구치열기 까지 장기적 관찰 및 치료가 필요할 것으로 사료된다. hypophosphatasia is a rare metabolic disorder which manifests characteristics such as abnormal mineralization of bone and dental tissues, diminished serum and tissue alkline phosphatase, and increased urinary secretion of PEA. It ingerited as an autosomal recessive or dominant trait and occurs in all races. In general, hypophosphatasia can be classified in 4 subtypes which are the perinatal, infantile, childhood, adult type depending upon the age at presentation and severity. In young children with Hypophosphatasia the long bones show irregular defects, and the skull showes poor calcification. In older children with premature closure of the skull sutures there may ve multiple lucent area called gyral or convolutional markings, described as resimbling beaten copper, presumably resulting from increased intracranial pressure,Examination of the jaws reveals a generalized lucency of the maxilla and mandible, the cortical bone and lamina dura are thin, and the alveolar bone may be deficient. Clinical features of Hypophosphatasia imclude premature loss of deciduous teeth, especially incisors, hypoplasia of aplasia of root cementum, enamel hypoplasia, irregular calcification of dentin, large pulp chamber, and resorption of marginal alveolar bone and roots. Our report involves a patient with a chief complaint of early loss of both Mx. and Mn. deciduous ncisors. after conducting a through clinical and radiographic examination this patient was referred to pediatrics under the suspicion of hypophosphatasia, the diagnosis proved to be correct and successful results were accomplished through a denture made to improve esthetics and function.

내부 전환 전자선에 의한 박막의 저지능에 관한 연구

최점수,김재형 인제대학교 1984 仁濟醫學 Vol.5 No.4

The purpose of this study which based on the experimental measurement about the energy loss of internal conversion electrons of 411.8 keV, and 1087.4 keV(Au-198 internal conversion K-, L-, and M-lines) is to measure the slopping power of the foils. The initial and the final momentum of the electrons were determined, and from these the energy loss of foils was calculated with the measuring of the peak's shift degree. The most probable energy loss of the electrons as a function of the thickness of the foils is shown on the graph, as the result of it, the experimental data of energy loss as a function of thickness is in good agreement with the theoretical one. For the 1987.4 keV(K-line), the result is not so good because the effect of the Bremsstrahlung is a little more than the one of scattering.

PC U형의 단면을 사용한 포스트텐션된 넓은 보-기둥 내부접합부의 비탄성 거동

최윤철,임재형,문정호,이리형,권기혁 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.1

Post-tensioned precast concrete system(PPS) consists of U-shaped precast wide beams and concrete columns. The continuity of beam-column joint is provided with the topping concrete on the PC shell beam and post-tensioning. The purpose of this paper is to evaluate the response of PPS interior beam-column joint subjected to cyclic lateral loading. To this end, the experimental investigation was performed with three half-scale specimens of interior connection. The design parameter is the ratio of beam width to column width. Test results showed that cracks were distributed well and plastic hinges spread toward midspan without any significant degradation of strength and ductility. And the specimens sufficiently resisted up to the limiting drift ratio of 0.035 given by ACI of acceptance criteria for concrete special moment frames.

감나무탄저병에서 분리한 Gloeosporium kaki의 2계통

崔貞植,李貴宰,金炯武,蘇仁永 全北大學校 1993 論文集 Vol.35 No.-

A anthracnose symptom at persimmon tree was found out in the field, Chonju in Chonbuk province and Haenam Experiment Station in Chonnam province in 1991 and 1992. The cultivated character and the pathogenicity of the fungi were as follows : These fungi, Gloeosparium kaki which were isolated from the anthracnose were classified into strain Ⅰ and Ⅱ by the cultivated characteristics. The size of conidia in strain Ⅰ was 22.5 × 6.82 ㎛ and that of strain Ⅱ was 20.3 × 6.2 ㎛. In a PDA, the colour of strain I was light brown and made a central zone. The colour of strain Ⅱ was black brown and deep grey and didn't make a central zone. The pathogenicity of strain Ⅰ was similar to strain Ⅱ in the leaf, branches.

역위매복된 상악 중절치의 외과적 노출과 교정력을 이용한 증례보고

최형준,최병재,김재윤,이제호 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.3

Inverted maxillary incisor is a state in which the maxillary incisor rotates to the upward position. The present report provides two examples of correction of inverted maxillary incisors with surgical intervention & orthodontic appliance. Through surgical exposure & direct bonding of lingual button, the central incisor were brought into proper eruption path with elastic traction. The case 1 & 2 were both treated successfully. The results showed the good position of treated teeth and satisfactory esthetics and adequate width of keratinized gingiva were achieved. Careful differential diagnosis procedure is needed in order to avoid dissatisfactory rusults and the treatment approaches taken in this case report provided an esthetic and functional results.

手腕部骨 成熟段階에 따른 頭部放射線計則學的 硏究

최해운,김재형,홍성준 全北大學校 齒醫學硏究所 1986 전북치대논문집 Vol.4 No.1

To investigate the relationship between craniofacial growth and bone maturity of the hand wrist in normal occlusion, the author took cephalogram and hand wrist adiogram of 391 students(male 192, female 199) and assessed the measurements of cephalogram according to skeletal maturity stages of the hand and wrist. In this study, four skeketal stages and 36 linear, angular measurements of the cephalometrics were selected. In hand-wrist X-ray the bone used to determine skeletal maturity were the middle phalanges of the third finger, and distal epiphysis of the radius. In cephalogram, the landmark used to measure the angle and length were N, S, Po., Ar., Go., Me., Gn., Pog., Point B, Point A, ANS, PNS, Or., U1, L1, U6, L6 etc.. The results were as follows ; 1. The table of mean, standared deviation, p-value from measurements were made in each group and both sex. 2. The measurements increased according to skeletal maturity were anterior cranial bese length, posterior cranial base length, ramus height, anterior facial height, posterior facial height, L1 to mandibular plane(㎜), facial plane angle. In contrast to, decreased measurements were gonial angle, facial convexity and facial plane angle. 3. Denture pattern measurements(IMPA, FMIA, occlusal plane to GoGn, interincisal angle, U1 to SN plane, U1 to SN plane, U1 to facial plane, L1 to facial plane etc.) had nothing to do with skeletal maturity. 4. Skeletal maturity had close relation with craniofacial growth, but had little to do with tooth development.

手腕部骨成熟段階에 따른 頭部放射線計則學的 硏究

崔海雲,金在衡 대한치과교정학회 1987 대한치과교정학회지 Vol.17 No.1

To investigate the relationship between craniofacial growth and bone maturity of the hand wrist in normal occlusion, the author took cephalogram and handwrist radiogram of 391 students (male 192, female 199) and assessed the measurements of cephalogram according to skeletal maturity stages of the hand and wrist. In this study, four skeketal stages and 36 linear, angular measurements of the cephalometrics were selected. In hand-wrist X-ray the bones used to determine skeletal maturity were the middle phalanges of the third finger, and distal epiphysis of the radius. In cephalogram, the landmark used to measure the angle and length were N, S, Po., Ar., Go., Me., Gn., Pog., Point B, Point A, ANS, PNS, Or., U1, L1, U6, L6 etc. The results were as follows, 1. The table of mean, standard deviation, p-value from measurements were made in each group and both sex. 2. The increased measurements according to skeletal maturity were anterior cranial bese length, posterior cranial base length, ramus height, anterior facial height, posterior facial height, L1 to mandibular plane (mm), facial plane angle. In contrast to, decreased measurements were gonial angle, facial cnvexity and facial plane angle. 3. Denture pattern measurements (IMPA, FMIA, occlusal plane to Go-Gn, interincisal angle, U1 to SN plane, U1 to SN plane, U1 to facial plane, L1 to facial plane etc.) had nothing to do withskeletal maturity. 4. Skeletal maturity had close relationship with craniofacial growth, but had little to do with tooth development.

측면충돌시 차체의 내장 패딩재가 승객손상에 미치는 영향

崔亨然,申宰浩 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-

NHTSA asks all passenger cars which would be on sale in US to pass the FMVSS 214 side impact test from 1996. According to the test regulations, moving deformable barrier strikes the stationary vehicle at 33.5mph with 27 degree inclined angles, which represents the perpendicular impact of 30mph on the side part of the moving vehicle with 15mph speed. During the test, two dummies are loaded on the front and back seats of the impact side to measure the acceleration histories of thoracic and pelvic regions. From the injury criterion of the regulation, peak acceleration thresholds are set at 85g and 130g for the thorax and pelvis prespectively. In comparison with the front impact accident, in which large amount of energy is absorbed by collapse of the structural parts such as engine room, side impact accident has much more chances in injury because of the limited space between the occupants and the doors. In order to protect the occupants more effectively, reducing the impact velocity with stiffened structures or introducing the energy absorbing paddings between occupants and the doors have been proposed. In this study, the effects of padding on the occupant injury level due to the side impact has been analyzed using finite element method. The density, thickness, and size of the paddings are chosen as the design parameters. Finite element analysis was performed using the PAM-CRASH? program and the model includes vehicle structures, side impact dummy, and the moving deformable barrier.