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정도진,양홍서,Jeong Do-Jin,Yang Hong-So 대한치과보철학회 2001 대한치과보철학회지 Vol.39 No.2
The purpose of this study was twofold. One was to evaluate the wettability of 4 elastomeric impression materials on tooth and different kinds of filling materials. The other was to identify the effect of topical surfactants sprayed on the surface of each impression. The elastomeric impression mate rials used in this experimental study were one polyether(Impregum F) and three polyvinyl siloxanes(Provil novo, Zerosil, Imprint). The abutments were prepared for 3/4 crown or onlay on the extracted human first molar. The filling materials used in this study for the duplication of prepared abutment were composite resin, amalgam, and casting metal. Impression was taken by manufacturer's recommendations and the number of voids on the impression surface was counted. The topical surfactants were Spannex $II^{(R)}$ and $Cohere^{(R)}$. The wettability was evaluated by comparing the number of voids between non-treated group and treated groups. The results were as follows : 1. $Zerosil^{(R)}$ showed the least number of voids on the impression surface. The number of voids increased in order of Provil $novo^{(R)}$, Impregum $F^{(R)}$, and $Imprint^{(R)}$. 2. Impregum $F^{(R)}$ and $Zerosil^{(R)}$ showed the least number of voids on the surface of dental stone master cast. The number is inclosed in order of Provil $novo^{(R)}$ and Imprint 3. When abutment material is tooth, the number of voids on the surface of master cast was smallest compared with that of other abutment materials. The number of voids increased in order of casting metal, amalgam and composite resin 4. The number of voids on the surface of the dental stone master cast was smallest when Spannex $II^{(R)}$ was used, followed by $Cohere^{(R)}$ treated group and non-treated group. These results suggest that the difference in wettability caused by the types of rubber base impression materials as well as abutment materials can affect the number of voids. And the use of topical surfactant for rubber base impression materials can improve the wettability of the materials and enhance the accurate master cast which has fewer surface voids.
마사지 로봇의 다양한 힘 제어에 대한 실험 성능의 비교에 대한 연구
정도진(Do-Jin Jeong),정슬(Seul Jung) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.9
This paper presents a one-axis massage robot for humans. The massage robot is controlled by force control algorithms so that a force sensor is mounted to measure the contact force and a ball caster is attached at the end to minimize the friction force. The massage robot is installed to an x-y-z gantry type robot arm to move the end effector to a specific position on the object. Force is controlled in the z-axis direction only. Three distinct force control algorithms are tested. Two major force control algorithms, hybrid and impedance force control, are tested along with an explicit force control algorithm. Experimental studies are performed on the artificial skin of a human model for cardiopulmonary resuscitation (CPR) training. Force control performances by each algorithm are compared.
정도진,양홍서,박상원 전남대학교 치과대학 2000 전남치대논문집 Vol.12 No.1
The purpose of this study is twofold. One is to evaluate the wettability of 4 elastomeric impression materials on tooth and different kinds of filling materials. The other is to identify the effect of topical surfactants sprayed on the surface of each impression. The elastomeric impression materials used in this experimental study were one polyether(Impregum F) and three polyvinyl siloxanes(Provil novo, Zerosil, Imprint). The abutments were prepared for 3/4 crown or onlay on the extracted human first molar. The filling materials used in this study for the duplication of prepared abutment were composite resin, amalgam, and casting metal. Impression was taken by manufacturer's recommendations and the number of voids on the impression surface was counted. The topical surfactants were Spannex Ⅱ?? and Cohere??. The wettability was evaluated by comparing the number of voids between non-treated group and treated groups. The results were as follows: 1. Zerosil?? showed the least number of voids on the impression surface. The number of voids increased in order of Provil novo??, Impregum F??, and Imprint??. 2. Impregum F?? and Zerosil?? showed the least number of voids on the surface of dental stone master cast. The number is increased in order of Provil novo?? and Imprint??. 3. When abutment material is tooth, the number of voids on the surface of master cast was smallest compared with that of other abutment materials. The number of voids increased in order of casting metal, amalgam and composite resin. 4. The number of voids on the surface of the dental stone master cast was smallest when SpannexⅡ?? was used, followed by Cohere?? treated group and non-treated group. These results suggest that the difference in wettability caused by the types of rubber base impression materials as well as abutment materials can affect the number of voids. And the use of topical surfactant for rubber base impression materials can improve the wettability of the materials and enhance the accurate master cast which has fewer surface voids.
탄탈륨 산화물 박막의 전기화학적 성장과 광전기화학적 응용
성영은,안광순,염준호,정도진 한국공업화학회 1999 응용화학 Vol.3 No.2
Thin films of tantalum oxide (Ta₂O_5) were formed electrochemically on tantalum electrode in several electrolytes at different applied voltages. The particle and pore sizes of oxide films were various depending upon the electrolytes. The thickness and structure of electrochemically grown oxides were examined using X -ray photoelectron spectroscopy (XPS), SEM, photoluminescence (PL), electroluminescence (EL) and cyclic voltammetry (CV). EL emissions of rare earth metal Tb³+ and organic Ru(bpy)₃²+ incorporated-Ta/Ta₂O_5 electrodes in aqueous solutions were observed. Since new EL emission energies are smaller than the band gap of 4.1 eV of Ta₂O_5, the resulting omissions are considered to be generated from surface states at the oxide band gap region. Incorporated inorganic and organic species are supposed to act as the luminescence centers for free electrons and holes. Since the emission spectra depend upon the incorporated chemical species and their concentrations, metal oxide films can be used for phosphor layers and analytical sensing probes by the controlled introduction of the label materials to produce surface states.