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류지열,박성현,최혁환,권태하 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
The ZnO(zinc oxide) thin film sensors were manufactured by RF magnetron sputtering method and added up to 4 wt. % Al_(2)O_(3), 1 wt. % TiO_(2) and 0.2 wt. % V_(2)O_(5) on the basis of ZnO material for developing the high sensitive gas sensors which have practically moderate resistivity and the stability. They were also grown on heated SiO_(2)/Si substrates of 250 ℃ at a pressure of about 10 mTorr in the pure oxygon gas with a power of about 80 watts for 10 minutes. To manufacture the thin film of the more stable high sensitivity, the thin films were also annealed from 400 ℃ to 800 ℃ and the thin films which were annealed with 700℃ for 60 minutes in the pure oxygon gas exhibited a good properties. The thin film grown in this conditions exhibited the sensitivity of maximum 550 in TMA gas concentration 160 pμm and exhibited a good stability and excellent linearity.
박성현,류지열,최혁환,권태하 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Pt/Ti heater for TMA gas sensor was fabricated by RF magnetron sputtering method. It was grown on heated Si substrates of 250 ℃ at a pressure of about 5 mTorr in the pure argon gas with RF power of about 140 watts. Pt and Ti target alternated at intervals of even 2 minutes for 30 minutes. The heater which was grown in the ratio of 1 to 1(Pt:Ti) exhibited initial(room temperature) resistance of 45 ohms and a power dissipation of 9.6 watts up to 300℃ heater temperature. The width of resistor variance(R_(T)/R_(O)) exhibited 1.65. We can conclude that heater which was grown in the ratio of 1 to 1(Pt:Ti) is useful as a heater for TMA gas sensor
김성우,최우창,류지열,박성현,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The DMA(Dimethylamine) gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. We investigated the sensitivity and response time according to temperature variation and DMA gas concentration. The ZnO-based thin film sensors sputtered in oxygen atmosphere showed higher sensitivity than those sputtered in argon atmosphere. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3) and V_(2)O_(5) and sputtered in oxygen atmosphere showed the maximum sensitivity of 218(working temperature, 250 ℃, DMA gas, 160 ppm) and speedy response time. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3), TiO_(2) and V_(2)O_(5), sputtered in oxygen atmosphere and aged at 330 ℃ showed the maximum sensitivity of 156(working temperature, 250 ℃, DMA gas, 160 ppm).
최우창,김성우,류지열,박성현,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The ammonia gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. We investigated the sensitivity and response time according to temperature variation and ammonia gas concentration. The sensors sputtered in oxygen atmosphere showed higher sensitivity than those sputtered in argon atmosphere. The Au(0.3 wt.%) doped-ZnO thin film sensors aged at 330 ℃ showed the maximum sensitivity of 28 and good response time at a working temperature of 250 ℃ and to 160 ppm ammonia gas. The Pt(0.1 wt.%) doped-ZnO thin film sensors showed the maximum sensitivity at a low working temperature of 200 ℃.
박성현,최우창,김성우,류지열,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The microheaters with Si_(3)N_(4)(1500Å)/SiO_(2)(3000Å)/Si_(3)N_(4)( 1500Å) diaphragm were fabricated by thin film technology and silicon micromachining techniques. Pt and poly-Si(n+) materials were used as heater materials of microheater. Pt temperature sensor was fabricated to detect the temperature of microheaters. The thermal analysis including temperature distribution on diaphragm and power consumption of the microheater were executed by the FEM method and heat transfer equations. The power consumption of the Pt and poly-Si(n+) heaters were measured and compared to that of thermal analysis by FEM simulation.
모바일 TFT-LCD 응용을 위한 새로운 형태의 자동화질 최적화 시스템 개발
류지열(Jee-Youl Ryu),노석호(Seok-Ho Noh) 大韓電子工學會 2010 電子工學會論文誌-SC (System and control) Vol.47 No.1
본 논문은 DSP를 이용한 새로운 형태의 TFT-LCD 자동 화질 최적화 시스템을 제안한다. 실제 산업 현장에서 이와 같은 화질 최적화 과정은 시행착오를 반복하는 형식으로 진행되어 많은 시간이 소요되고 있으며 LCD 개발 엔지니어들의 성향 및 숙련도에 따라 조정 결과에도 편차가 큰 문제점이 있다. 이러한 시스템은 평균 감마 오차, 감마 조정 시간 및 플리커 등을 줄이기 위해 모바일 LCD 구동 IC 내의 감마 조정 레지스터들과 전압 설정 레지스터들을 자동적으로 제어한다. 제안된 최적 화질 향상 시스템은 측정 대상이 되는 모듈 (MUT, LCD 모듈), 제어 프로그램, 휘도 측정용 멀티미디어 디스플레이 측정기 및 인터페이스용 제어 보드로 구성되어 있다. 개발된 시스템에는 참조 감마 곡선과의 6-점 프로그램 정합 기술을 이용한 새로운 알고리즘 및 자동 전압 설정 알고리즘이 내장되어 있다. 개발된 알고리즘과 프로그램은 범용 LCD 모듈에 적용가능하다. 또한 1.8, 2.0, 2.2 및 3.0 감마를 조정할 뿐만 아니라 플리커 수준을 자동으로 조절한다. 제어 보드는 DSP와 FPGA로 구성되어 있고, RGB 및 CPU와 같은 다양한 인터페이스들을 지원한다. 개발된 자동 감마 시스템은 기존의 시스템에 비해 현저히 짧은 감마 조정 시간 및 아주 작은 평균 감마 오차를 보였다. 또한 본 논문에서 제안하는 시스템은 최적화된 감마 곡선 설정을 이용한 개발 공정을 향상시키고, 고화질의 LCD를 제공하는데 아주 유용하다. This paper presents a new automatic TFT-LCD image quality optimization system using DSP for the first time. Since conventional manual method depends on experiences of LCD module developers, it is highly labor-intensive and requires several correction steps providing large gamma correction error. The proposed system optimizes automatically gamma adjustment and power setting registers in mobile TFT-LCD driver IC to reduce gamma correction error, adjusting time, and flicker. It contains module-under-test (MUT, TFT-LCD module), PC installed with program, multimedia display tester for measuring luminance and flicker, and control board for interface between PC and TFT-LCD module. We have developed a new algorithm using 6-point programmable matching technique with reference gamma curve and applying automatic power setting sequence. Developed algorithm and program are generally applicable for most of the TFT-LCD modules. It is realized to calibrate gamma values of 1.8, 2.0, 2.2 and 3.0, and reduce flicker level. The control board is designed with DSP and FPGA, and it supports various interfaces such as RGB and CPU. Developed automatic image quality optimization system showed significantly reduced gamma adjusting time, reduced flicker, and much less average gamma error than conventional manual method. We believe that the proposed system is very useful to provide high-quality TFT-LCD and to improve developing process using optimized gamma-curve setting and automatic power setting.