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유도현(Do-Hyun You) 대한전기학회 2016 전기학회논문지 Vol.65 No.5
The purpose of this study optimizes the conditions of PLA printing material for 3D printer. Deltabot type 3D printer is used. The ranges of printing temperature, printing speed, and infill density are 195∼215℃, 10∼70mm/sec, and 10∼100% respectively. From the results of printing temperature, printing quality is almost same every printing temperature. From the results of printing speed and infill density, printing quality is excellent under 40mm/sec, and over 50% respectively. Surface roughness is 2.28 μmRa at 205℃, 10mm/sec, 100%, and is 5.93 μmRa at 205℃, 70mm/sec. Surface roughness is directly proportional to the printing speed, and is inversely proportional to the infill density. Objects fabricated PLA printing material adhere bed at room temperature.
유도현(Do-Hyun You) 한국진공학회(ASCT) 2001 Applied Science and Convergence Technology Vol.10 No.2
본 연구에서는 솔젤법에 의해 최적의 유전특성을 갖는 TiO2 박막의 제작조건을 정한다. 이를 위해 최적의 조건으로 합성된 sol을 이용하여 박막을 제작한 후 박막의 유전율을 측정한다. 가수분해에 필요한 물의 양이 화학 양론적인 양보다 적은 경우에는 직쇄상 구조를 갖는 투명 sol이 생성되고 많은 경우에는 cluster상 입자를 갖는 현탁 sol이 생성된다. 또한 박막의 유전율은 120℃부근을 시작으로 지수함수적으로 증가하는 것을 알 수 있다. In this study, synthesis condition of TiO2 thin films which have optimal dielectric characteristics using sol-gel method was determined. Thin films were fabricated using sol which have optimal characteristics and their permittivity was measured. In case of the amount of water for hydrolysis smaller than that for stoichiometry, sol formed clear sol which have normal chain structure. On the contrary, in case of the amount of water for hydrolysis larger than that for stoichiometry, sol formed suspended sol which have cluster structure. The permittivity of thin films increased exponentially around 120℃.
柳道鉉(Do-Hyun You) 대한전기학회 2007 전기학회논문지 Vol.56 No.7
TiO₂-V₂O? sol was prepared using sol-gel method. Sol changed to gel with hydrolysis and polymerization. DTA properties of gel powder had endothermic reaction due to evaporation of propanol about 80℃, had exothermic reaction due to combustion of propanol about 230℃ and had exothermic reaction due to combustion of alkyl group about 350℃. Crystalline properties of gel powder retained amorphous phase at 50℃, retained anatase phase from 400℃ to 600℃ and had all rutile phase over 700℃ at 0.01mole V₂O? additive. The capacitance of thin films increased with increasing heat treatment temperature and thin films had best properties at 700℃. The capacitance of thin films increased a lot with decreasing measurement frequency.
자동차 내부의 김서림 감지 및 제거를 위한 최적의 조건
유도현(Do-Hyun You) 대한전기학회 2012 전기학회논문지 Vol.61 No.5
For mist sensing, temperature-humidity sensor is attached on six positions of front glass and rearview mirror in automobile. Bottom-left side of front glass is the best position where mist is sensing. For mist removal, air conditioner is turned on intensity 1, 3 and is set the temperature at 17[℃], 25[℃]. And heater is turned on intensity 1, 3 and is set the temperature at 25[℃], 32[℃]. The best condition which mist is removed is temperature at 17[℃] and intensity 3 of air conditioner mode. At this condition, total average value of humidity output voltage difference is 0.561[V]. Also, air conditioner mode is effective than heater mode for mist sensing and removal.
R.F.스퍼터링법에 의해 제작된 TiO₂ 박막의 습도감지특성
유도현(Do-Hyun You) 대한전기학회 2013 전기학회논문지 Vol.62 No.7
TiO₂ thin films are fabricated using R.F.sputtering method. TiO₂ thin films are coated on Al₂O₃ substrate printed IDE(interdigitated electrode). Impedance of thin films decreases according to increase relative humidity and it increases according to decrease measuring frequency. When substrate temperature is room temperature, impedance of thin films is from 45.68[MHz] to 37.76[MHz] within the limits from 30[%RH] to 75[%RH] at 1[kHz]. Whereas when substrate temperature is 100[℃], impedance of thin films is from 692[kHz] to 539[kHz] within the limits from 30[%RH] to 75[%RH] at 1[kHz]. Impedance variation of thin films is bigger in low frequency regions than in high frequency regions. When substrate temperature is 100[℃], impedance of thin films is lower than that of room temperature.
90[wt%] SnO₂-10[wt%] TiO₂ 세라믹스의 습도감지특성
유도현(Do-Hyun You) 대한전기학회 2014 전기학회논문지 Vol.63 No.9
The purpose of this paper is to establish the optimum fabricating condition of specimens using silk screen printing, and to develop humidity sensor which has good humidity sensing properties. The specimens are fabricated under the condition of 90[wt%] SnO₂-10[wt%] TiO₂, and their microstructure, crystalline structure, humidity sensing properties are examined. From the microstructure analyses, porosity is best at 700[℃]. From the crystalline structure analyses, intensity of peak becomes strong according to increasing heat treatment temperature. From the humidity sensing properties analyses, an overall results of capacitance changes, linearity and hysteresis for the specimens is best at 600[℃] and 700[℃]. Capacitance of specimens increases according to decreasing measurement frequency, and to increasing relative humidity.
유도현(You Do Hyun) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.5
TiO₂-V₂O? sol was fabricated using sol-gel method and TiO₂-V₂O? thin films were fabricated using dip-coating method. V₂O? sol was added 0.01mole, 0.03mole, 0.05mole into TiO₂ sol. Capacitance of thin films decreased with increasing V₂O? additive and it increased largest at 0.01mole. Because adsorption time and desorption time of thin films was about 2 minutes 40 seconds and about 3 minutes 40 seconds respectively, adsorption time was faster about 1 minutes than desorption time.
유도현(Do-Hyun You) 대한전기학회 2009 전기학회논문지 Vol.58 No.10
TiO₂ films are fabricated using silk printing method. Heat treatment temperature of films is 600[℃]. From the analysis of microstructure, grain size of TiO₂ films is about 0.2∼0.3[㎛]. Thickness of films is 30.19[㎛] and surface uniformity of films is good. From the analysis of crystalline structure, TiO₂ films transform anatase phase to rutile phase. Capacitance of films increases according to increase relative humidity and decrease measuring frequency. Hysteresis characteristics of capacitance and impedance are best at 45[%RH] and 75[%RH] respectively. Impedance of films increases according to decrease measuring frequency.
유도현(You Do Hyun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
TiO₂- Nb₂O? sol was prepared using sol-gel method. DTA properties of gel powder had endothermic reaction due to evaporation of propanol and water about 78℃, had exothermic reaction due to propanol combustion about 290℃ and had exothermic reaction due to changing of TiO₂ phase about 640℃. Capacitance of thin films increased according to increasing relative humidity, whereas it decreased according to increasing measured frequency.