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상아질과 복합레진 접착부의 피로파괴에 관한 실험적 연구
이지연,김재곤,차경,백병주 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.2
The purpose of this study was to investigated and evaluate the tensile bond strengths and fatigue fracture characteristics of four dentin adhesive systems to dentin surface. 99 extracted human teeth were randomly assigned to four groups, and exposed dentin surfaces treated with four dentin bonding agents. Resin composite was bonded to dentin by use of commercial adhesive systems. Thensile bond strengths were determined in an Instron universal testing machine at a crosshead speed of 1mm/min. and the fatigue characteristics were measured by the fatigue characteristics were measured by the Fatigue testing machine(Electro-dynamic type). Fractured dentin surfaces were examined by SEM. The following results were obtained. 1. The tensile bond strengths were 21.45MPa in All-Bond 2 group, 18.67MPa in AElite group, and 18.59MPa in Scotchbond Multi-Purpose group were higher than 10.29MPa in Gluma group(P<0.001). 2. The fatigue life of All-Bond 2, AELite and Scotchbond Multi-Purpose group were singificantly higher than Gluma group when a 24.13MPa cyclic flexure load was applied(P<0.001). 3. The fatigue life of All-Bond 2, AElite and Scotchbond Multi-Purpose group were decreased when a 39.21 or 45.25MPa cyclic flexure load was applied, but these were not showed statistically different(P>0.05). 4. In All-Bond 2, AElite and Scotchbond Multi-Purpose group, the fatigue fracture of resin/dentin interface occured within a resin-infiltrated area, but in Gluma group, at near its interface with adhesive layer.
이재곤,신장규,이정희,최시영 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
The surfaces of (100) InSb were analyzed by Auger electron spectroscopy before and after sulfur treatment. The Auger spectrums for In_(2)O_(3), Sb_(2)O_(3), and elemental Sb were detected in the native oxide of InSb surface. After the sulfur treatment by ammonium sulfide((NH_(4))_(2)S_(x)), carbon content stays almost constant, but a great deal of the surface oxygen is replaced by sulfur, probably as a surface InSb-sulfide. For the case of the surfce which was sulfur treated during 2min at 25℃, carbon, oxygen and sulfur concentrations at surface were 11%, 6%, and 34%, respectively, and the In/Sb surface ratio was 1.0.
이재곤,박상준,김영일,최시영 경북대학교 센서기술연구소 1991 센서技術學術大會論文集 Vol.2 No.1
The insulated gate field effect transistor which is senstive to pressure has been fabricated. It consists of two pt-region of the source and the drain in the n-type silicon substrate, and the gate area. The gate electrode is the evaporated aluminium film on the micro-diaphragm resembling a pillbox which covers the drain, source, and gate oxide. The space between the gate oxide and the diaphragm is an air-gap. When the pressure is applied on the diaphragm, the diaphragm deflects and changes the gate capacitiance. As a result, the conductivity between source and drain is modulated. The fabrication processes utilized the conventional integrated circuit fabrication methods. The diaphragm is the SiNx film which is deposited by the PECVD (plasma enhanced chemical vapor deposition). The diaphragm has 200μm X 200μm of area and 3 μm of thickness. The characteristics of the sensor with pressure was non-linear. The threshold voltage was linearly increased with the increasing pressure. The pressure sensitivity of threshold voltage was 2.0 mV/mmHg.
이재근,강경봉,김인곤 동의대학교 산업기술개발연구소 2006 産業技術硏究誌 Vol.20 No.-
Cosmetic parts such as side keys, navigator switches and Window frames in Cellular phone have been produced mostly by nickel electroforming. But nickel has an allergic reaction with skin. Copper is known to be the most promising alternative material for nickel. In this feasibility study of copper electroforming, copper plating bath type, its optimum composition and mechanical properties were studied. Chloride free-acid copper sulfate was found to be the most suitable bath compared with pyrophosphate and cyanide baths. Target hardness value of 200~220DPH could be obtained by adding 401/402 additives in copper sulfate bath. Another weakness of copper electroform is its poor corrosion characteristic. In order to increase its corrosion resistance, four types coating were applied on top of copper surface. They were Cu/Cu-Sn-Zn/Cr, Cu/Pd/Cr, Cu/Cu-Zn-Sn, Cu/Cr. Salt spray test showed that Cu/Cu-Sn-Zn/Cr did not show any pit after 72hours salt spray test.
매복 견치 및 저위교합 제 1대구치의 자가 이식에 의한 치험례
이승익,김재곤,권선자,백병주 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.2
In orthodontic treatment of certain cases of tooth loss, aplasia, or ectopia, autotransplantation is sometimes valid treatment alternative often provides and improved result, compared to conventional orthodontic treatment, an apprporiate donor tooth is available and the anatomic circumstances permit it. Clinically, successful transplants must show a radiolucent space between the roots and surroundings bone. There must be no evidence of ankylosis, no permanent root resorption, and no inflammation. Histologically, the criterion of success is a normal and functional periodontal ligament between the root surfaces of transplants and the bone, or gingival connective tissues. The successful autotransplantation of a impacted maxillary canine and infraoccluded mandibular 1st molar is reported. In case Ⅰ, impacted canine with incompletely developed root apex was maintained pulp vitality due to appropriate root development and short extraoral time, atraumatic surgical procedure. In case Ⅱ, infraoccluded molar was started endodontic treatment after 3 weeks. Because of closed apex, possibility of revasculization is rare. Both case Ⅰ, Ⅱ did not ankylosis and the periodontal and periapical tissues appears to be normal after 3 months. In autotransplantation cases it is important to transplant the tooth as quickly and as atraumatically as possible to dimish the chance of ankylosis and root resorption. In all cases of transplantation, patient selection minimal operating time, and good oral hygine will increase the chance for a successful prognosis.