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.

흰쥐 십이지장 점막의 Polyamine 대사, [^(14)C]Spermine 단백 결합능 및 [³H]Thymidine DNA 섭취에 대한 Calcitriol과 Prednisolone의 상호작용

최상현,이영재,정휘정,김형건,신경호,천연숙,전보권 고려대학교 의과대학 1997 고려대 의대 잡지 Vol.34 No.1

Calcitriol has been shown to induce the duodenal synthesis of the spermine-binding protein. and hydrocortisone was reported to increase the intestinal polyamine contents. This study examined whether prednisolone might enhance or reduce the calcitriol effects on the polyamine contents, [^(14)C]spermine-protein binding activity, and [^(3)H] thymidine DNA synthesis of the rat duodenum. The mucosal contents of putrescine. spermidine. and spermine were increased by 198.8%, 84.0%, and 78.3%, respectively, within 6 hours after calcitriol. 5 ㎍/kg (CT) and fell down to the control values at 12 hours. And prednisolone. 10 mg/kg (PD) also increased the polyamine contents in similar patterns. They did not counteract each other in the polyamine metabolism. CT increased the [^(14)C]spermine-binding activity of the cytosol protein fraction from the duodenal mucosa by 71.1%. But PD increased the binding activity by 28.0% and did not affect the CT-induced increase. CT increased the [^(3)H]thymidine DNA synthesis of the duodenal mucosa by 42.3%. but PD reduced it slightly. The CT-dependent increase of the synthesis was significantly inhibited by PD. These results suggested that the inhibitory effect of glucocorticoids on the vitamin D dependent increases of the duodenal calcium absorption and mucosal proliferation seems not to be associated with the metabolic changes of polyamines in the duodenal mucosa.

정전형 에너지 분석기의 제작과 그 특성

崔點洙,金在亨 인제대학교 1985 仁濟論叢 Vol.1 No.2

The hemispherical and the cylindrical electrostatic energy analyzer and RPD analyzer were fabricated, and the resolutions and theoretical VE/VD values and experimental values of each analyzer were compared each other. The experimental value of VE/VD and theoretical one for the hemispherical analyzer are found to be 1.90 and 1.84 respectively, and resolution is 0.032. The VE/VD value of cylindrical analyzer is 1.00 experimentally and 1.38 theoreticaly. The resolution of cylindrical and RPD analyzer are 0.1 and 0.43 respectively, Ion trajectories are simulated by computer to examine the motion of ions in analyzer, and acceptance angle was bellow 0.07.

Open-face Stainless Steel Crown을 이용한 유전치의 치료에 대한 증례보고

최형준,이제호,최병재,김종민 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.4

In spite of the improvements of the techniques in the field of preventive dentistry, many children still present with extensive destruction of primary anterior teeth. Not only the practioner must consider the pulp state of the primary incisor, but also restore the form, function and esthetics of the tooth. Restorative treatment of primary incisor tooth requires durability, retention and esthetics. Stainless steel crowns used in restoring primary anterior teeth is retentive and durable in comparison with the composite resin, celluloid crown. But they are not esthetic. To enhance the esthetics of the anterior stainless steel crown without reducing its superior retention, an open-face stainless steel crown has been suggested. Several authors have suggested cutting away the labial portion of the stainless steel crown and placing the composite resin in that area. By following this technique, the practioner can prepare a retentive, durable, and esthetic restoration for primary teeth which have suffered from extensive loss of teeth structure. In addition, the single missing primary anterior teeth can be successfully restored by soldering the stainless steel crown together. Open-face stainless steel crown is indicated in the areas of large interproximal lesions involving incisal edge, crown fracture with pulp exposure and congenital malformation of the teeth. By this technique, the practioner can restore primary anterior teeth successfully regardless of the amount of remaining tooth structure, bruxism habit and presence of attrition. In this case, rampant caries with extensive loss of tooth structure and single missing of primary anterior tooth hart been successfully treated with open-face stainless steel crown.

간흡충 감염증의 진단에서 피내반응 검사의 유용성 검토

최재철,오승환,정해진,신정환,박기형,이은엽,장철훈 대한임상미샐물학회 2003 Annals of clinical microbiology Vol.6 No.2

복합 치아종에 관한 증례보고

최형준,최병재,손흥규,양호정 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.2

The odontoma is relatively a common odontogenic tumor. It has come to mean as a growth in which both the epithelial and the mesenchymal cell exhibit complete differentiation, with the result that functional ameloblast and odontoblast form enamel and dentin. The etiology of it is unknown, but it has been suggested that local trauma or infection may lead to the production of such a lesion. Odontma is divided into 2 types. One is compound odontoma that is at least superficial anatomic simiarity to normal teeth, and the other is complex odontoma, that calcified dental tissues are simply an irregular mass bearing no morphologic similarity even to rudimentary teeth. Somtimes this malformation is not easily identified because its lacking of calcification. So, if permanant tooth is delayed to erupt, one should take a careful look the radiographic film to find that whether the cause of it is odontoma or not. In this case report, 3 patients with odontoma who visited Dept. of Pediatric Dentistry in Yonsei Dental College, were treated by means of surgical removal. The obtained results were as follows: 1. The odontoma is usually related to impacted tooth, and it is occurred neighboring to the crown of impacted tooth that have normally developed. So, in the case of missing tooth and delayed eruption, its presence should be investigated. 2. The odontoma can be seen vaguely radiographically, so, it is difficulty to make diagnosis. 3. The treatment of odontoma is a surgical removal. And, if it is completely removed, its occurrence is rare. 4. In the case of impacted tooth being associated with compound odontoma, continuous management is necessary for the eruption of impacted tooth after the surgical extraction of odontoma. 5. It resembles the ameloblastic odontoma radigraphically, and if it is the case, the treatment may vary, so the confirmation through histologic examination after removal of mass is necessary.

2-Bromopropane이 암컷 골든 햄스터의 생식기능에 미치는 영향

최돈찬,최형재,박창은 龍仁大學校 2000 용인대학교 논문집 Vol.18 No.-

Ovarian dysfunction induced by 2-bromopropane(2-BP) has been described in female factory workers and experimental animals. However, the underlying mechanism is still unclear. 2-BP is the possible causative chemical for reproductive and hematopoietic toxicity. To clarify the effect of 2-BP on the female reproductive function, repeated doses of 2-BP were administered to female golden hamsters for 24 days. Following 2 completed estrous cycles, animals received subcutaneously vehicle(corn oil), 80mg/kg, 400mg/kg, 2000mg/kg of 2-BP for 8 days. The females were then mated with males. The treatment continued for a gestation period(16 days). Dams treated with 2-BP showed a significant decrease in body weight. 2-BP decreased the fertility and tended to decrease the number of pups born and the rate of pregnancy, depending on the dose. The eccentric pyknotic cells, shrinkage of oocyte, and scattered cells were appealed in the middle and higher dose groups. The results indicate that reproductive toxicity induced by 2-BP was dose-dependent in that the higher doses exhibited more severe toxicity than the lower doses in our 24-day repeated dose experiments. Thus, 2-BP as a endocrine disrupter affects female reproductive activity to cause the destruction of primordial follicle and its oocyte in the ovary.

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.

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.

農業機械要素의 스트레인 測定에 關한 基礎的 硏究

崔秉旻,文燦,全炳柱,朴又龍,金在煐 順天大學校 1984 論文集 Vol.3 No.1

This experiment is on a direct measuring system of sensor's transform voltage by using measuring computer which does not use data recorder of oscillo graph. The results obtained from the experiment are as follows: 1. Measuring data can be promptly acquired by A/D converting program and measuring computer program. 2. Separte recording and graphing are needless, for a graph and a data of measuring voltage are directly printed by a printer. 3. Simplification and miniature of measuring can be obtained through on-line measuring system by using measuring computer program. 4. Strain, bending moment, bending stress and load can be gained by using a leanear equation which is gained by relation of voltage versus strain.