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박종국,전대우,이미재,임태영,황종희,배동식,김진호,Park, Jong-Guk,Jeon, Dae-Woo,Lee, Mi-Jai,Lim, Tea-Young,Hwang, Jonghee,Bae, Dong-Sik,Kim, Jin-Ho 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.12
Anti-reflective (AR) thin film was fabricated on a glass substrate by sol-gel method. The coating solution was synthesized with TEOS (tetraethlyorthosilicate) and poly ethylene glycol (PEG, 4.0 wt%). As the withdrawal speed of coating was changed from 0.1 mm/sec to 0.3 mm/sec, the thickness and refractive index of prepared thin films were changed. The reflectance and transmittance of coating glass fabricated by the withdrawal speed of 0.1 mm/sec were 0.62% and 95.0% in visible light range. The refractive index and thickness of single layer thin film were n= 1.29 and ca. 99.0 nm.
박종국,전대우,이미재,임태영,황종희,김진호,Park, Jong-Guk,Jeon, Dae-Woo,Lee, Mi-Jai,Lim, Tea-Young,Hwang, Jonghee,Kim, Jin-Ho 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.1
Transparent color coating films were fabricated on a glass substrate by using sol-gel hybrid binder and organic dye. Sol-gel hybrid binder coating film fabricated with PTMS of 0.03 mole showed a very high pencil hardness of 9 H. As the withdrawal speed increased from 1.0 mm/s to 5.0 mm/sec, The yellowness ($b^*$) of coating glass also gradually increased. The transmittance of yellow color coating glass was 82.6% and the haze of coating glass was 0.35%. Red and blue color coating glasses also showed the high transmittance of 62.4% and 80.6% respectively. The surface hardness of color coating films was 6 H.
바이어스 인가 방식에 의한 컬러 화강석 제조에 관한 연구
박종국,신홍직,최원석,한재찬,Park, Jong Kug,Shin, Hong-Jik,Choi, Won Seok,Han, Jae Chan 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.4
In this study, we investigated the color change of the normal light gray granite as the high value color granite. By coating the metal catalyst liquid on the surface of granite stone, the metal particles were penetrated into the granite and the color of granite was changed permanently through the annealing treatment. To increase penetration depth into the granite, we used DC (direct current) bias. Two kinds of bias were used such as DC bias and pulse DC bias. And the penetration time was changed as 30 and 60 min. In all cases, the color granite were successfully obtained. Regardless of the catalyst reaction time, the penetration depth was increased by using the bias treatment. We obtained a penetration depth of 21 mm with the DC pulse bias during 60 min.
Sol-gel 하이브리드 용액을 이용한 반사방지막 제조
박종국,이지선,이미재,이영진,전대우,김진호,Park, Jong-Guk,Lee, Ji-Sun,Lee, Mi-Jai,Lee, Young Jin,Jeon, Dae-Woo,Kim, Jin-Ho 한국결정성장학회 2016 한국결정성장학회지 Vol.26 No.6
초음파 스프레이를 이용하여 유리기판 위에 반사방지 박막이 제조되었다. GPTMS와 TEOS는 솔-젤 하이브리드 코팅 용액을 제조하기 위하여 사용되었다. 반사방지막의 코팅 두께를 제어하기 위하여 스프레이 노즐의 이동속도는 15~25 mm/s로 변경되었다. 스프레이 노즐의 이동속도가 증가 됨에 따라 반사방지막의 두께는 138 nm에서 86 nm로 감소되었다. 20 mm/s의 노즐 이동속도에 의해 제조된 반사방지막의 굴절률은 약 1.31, 막의 두께는 104 nm이며, 380 nm에서 780 nm의 가시광 영역에서의 평균 반사율은 0.75 %, 투과율은 94 %로 측정되었다. Anti-reflection (AR) thin films were fabricated on a glass substrate by using an ultrasonic spray. Glycidoxypropyl trimethoxysilane (GPTMS) and tetraethyl orthosilicate (TEOS) were used to synthesize a sol-gel hybrid coating solution. The moving speed of spray nozzle was changed from 15~25 mm/s to control the coating thickness of AR thin film. As the moving speed of spray nozzle increased, the thickness of AR thin film decreased from 138 nm to 86 nm. When the AR thin film was fabricated by nozzle moving speed of 20 mm/s, the refractive index and thickness of AR thin film was measured to be 1.31 and 104 nm, respectively. The average reflectance and transmittance of AR thin film coating glass was measured to be 0.75 % and 94 %, respectively into the visible light range of 380~780 nm.
전압인가 LBL법을 이용한 (PDDA/SiO<sub>2</sub>) 박막 제조
박종국,경규홍,이미재,황종희,임태영,김진호,Park, Jong-Guk,Kyung, Kyu-Hong,Lee, Mi-Jai,Hwang, Jonghee,Lim, Tae-Young,Kim, Jin-Ho 한국재료학회 2014 한국재료학회지 Vol.24 No.12
(PDDA/$SiO_2$) thin films that consisted of positively charged poly (diallyldimethylammonium chloride) (PDDA) and negatively charged $SiO_2$ nanoparticles were fabricated on a glass substrate by an applying voltage layer-by-layer (LBL) self-assembly method. In this study, the microstructure and optical properties of the (PDDA/$SiO_2$) thin films coated on glass substrate were measured as a function of the applied voltage on the Pt electrodes. When 1.0 V was applied to a Pt electrode in a PDDA and $SiO_2$ solution, the thickness of the $(PDDA/SiO_2)_{10}$ thin film increased from 79 nm to 166 nm. The surface roughness also increased from 15.21 nm to 33.25 nm because the adsorption volume of the oppositely charged PDDA and $SiO_2$ solution increased. Especially, when the voltage was applied to the Pt electrode in the $SiO_2$ solution, the thickness increase of the (PDDA/$SiO_2$) thin film was larger than that obtained when using the PDDA solution. The refractive index of the fabricated (PDDA/$SiO_2$) thin film was ca. n = 1.31~1.32. The transmittance of the glass substrate coated by (PDDA/$SiO_2$)6 thin film with a thickness of 106 nm increased from ca. 91.37 to 95.74% in the visible range.
박종국,전대우,이미재,임태영,황종희,김진호,Park, Jong-Guk,Jeon, Dae-Woo,Lee, Mi-Jai,Lim, Tea-Young,Hwang, Jonghee,Kim, Jin-Ho 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.12
Transparent Ag nanowire conducting thin films with high surface hardness were fabricated by bar coating method. When coating speed was changed from 35 mm/sec to 50 mm/sec, the transmittance of coated glass increased from 65.3% to 80.8% in visible light range and the surface resistance was changed from $10.1{\Omega}/sq$ to $23.3{\Omega}/sq$. The surface hardness and adhesion of thin film were 5H and 5B.
문병준(ByoungJoon Moon),박용제(YongJe Park),김동신(DongShin Kim),박종국(ChongKug Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The EPB system is actually designed to get the braking force by the electric motor through a driver's simple switch operation, not the existing system that conventional parking brake gets braking force through a driver's power. The EPB system is composed of ECU, PWM(Pulse Width Modulation) driver, DC motor and actuator. The ECU decides a brake's apply/release according to a driver's input and controls command to generate desired braking force. The force sensor value plays the most important role in supplying enough braking force to EPB system. If the force sensor is in a fault, it can give vehicle safety a serious danger since enough braking force is not supplied. Therefore, it is necessary to develop a model based fault detection method with high reliability to detect an abnormal signal fault. It can't detect by the existing on-line sensor monitoring method.