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대형 터치스크린의 고속감지를 위한 주파수분할 동시센싱 기법
장운용,김형원,Jang, Un-Yong,Kim, HyungWon 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.4
본 논문은 대형 터치스크린을 위한 고속 터치감지 및 노이즈 제거를 위한 FDCS (Frequency division concurrent sensing) 기법을 제안한다. 기존의 터치스크린 감지방식은 대부분 구동신호를 순차적으로 인가하고 순차적으로 센싱신호를 분석하기 때문에 감지속도가 터치스크린 크기에 따라 급격히 감소하여 대형터치스크린에 적용하기 어려운 문제점이 있다. 제안된 기법은 모든 드라이브라인에 서로 다른 주파수의 신호를 동시에 인가하고 각 센스 라인의 신호를 주파수 영역에서 분석하는 기법으로 대형스크린에서도 고속의 감지속도를 제공한다. 또한 주파수영역에서 노이즈 필터링기법을 제안하여 터치감지신호는 누적하고 노이즈는 상쇄하며, 터치스크린의 주파수전달함수의 역의 특성을 가지는 pre-distortion equalizer를 적용하여 터치감도 SNR을 더욱 개선한다. 23" 대형 터치스크린 모델에 실제의 환경 노이즈를 적용하여 실험한 결과 본 제안기술이 기존 기법 대비 frame scan rate을 274%, SNR을 43dB 증가시킴을 보인다. This paper presents a high-speed sensing and noise cancellation technique for large touch screens, which is called FDCS (Frequency Division Concurrent Sensing). Most conventional touch screen detection methods apply excitation pulses sequentially and analyze the sensing signals sequentially, and so are often unacceptably slow for large touch screens. The proposed technique applies sinusoidal signals of orthogonal frequencies simultaneously to all drive lines, and analyzes the signals from each sense line in frequency domain. Its parallel driving allows high speed detection even for a very large touch screens. It enhances the sensing SNR (Signal to Noise Ratio) by introducing a frequency domain noise filtering scheme. We also propose a pre-distortion equalizer, which compensates the drive signals using the inverse transfer function of touch screen panel to further enhance the sensing SNR. Experimental results with a 23" large touch screen show that the proposed technique enhances the frame scan rate by 273% and an SNR by 43dB compared with a conventional scheme.
장운용,차현규,차상욱,박대원,길경석,Jang, Un-Yong,Cha, Hyeon-Kyu,Cha, Sang-Wook,Park, Dae-Won,Kil, Gyung-Suk 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.3
This paper dealt with the design, fabrication and application of a risk voltage measurement system (RVMS) which analyzes the step and touch voltages in electrical grounding systems. The RVMS supply 300 V and 1.4 A in ranges from 40 Hz to 1 kHz as the test power source. A DAQ module having resolution of 400 kS/s and 16 bit is equipped with 7 inputs for measuring voltage and current. Also, a noise elimination algorithm of digital filter was applied to reduce the measurement error caused by external noises as a commercial frequency current. The performance of the RVMS was evaluated by measurement of the step and touch voltage according to the IEEE standard 80 and 81 in a grounding system with a 10 m counterpoise. The result showed that the RVMS analyzes the risk voltage with the error below 5%.
장운용(Un-Yong Jang),박성주(Sung-Ju Park),박대원(Dae-Won Park),길경석(Gyung-Suk Kil),류길수(Keel-Soo Rhyu) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
We measured the magnitude and the frequency of surge voltages in a shipboard lighting system to practical use for the design of surge protective circuit of shipboard LED lamps. Shipboard electronic device such as LED lamp are exposed to surge voltages because many large capacity power facilities are set up at a small space in shipboard, We installed an surge recorder (PWV-002) which is connected with a lighting power line in a room, and measured surge voltage for four days operation. The magnitude of the measured surge voltage was in ranges of 120 [V]~l,250 [V]. The front time and the duration were in ranges of 3 [㎲]~7 [㎲] and of 30 [㎲]~60 [㎲], respectively. In case of this paper, metal oxide varistor (MOV) with 470 [V<SUB>ref</SUB>] and 2.5 [㎄] for 8/20 [㎲] is sufficient for the surge protective device of shipboard LED lamps.
장운용(Un-Yong Jang),김선재(Sun-Jae Kim),정광석(Kwang-Seok Jung),차현규(Hyeon-Kyu Cha),길경석(Gyung-Suk Kil),류길수(Keel-Soo Rhyu) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
This paper described the application and the field test of Light emitting diode (LED) lamp to shipboard. LED is a good light source especially for shipboard lighting because of its compact structure which makes water a kind explosion proof, anti-vibration. Also, LED has many advantages such as high efficiency, low power consumption, fast response, environment-friendly, and longer lifetime in comparison with the conventional lamps. In this study, a 40 [W] LED light panel which replace a 20 [W]~40 [W] fluorescent lamp (FL), and a 8.5 [W] LED lamp which replace a 20 [W] fluorescent and a 60 [W] incandescent lamp (IL) were installed in rooms of a ship. The installation effect showed an energy saving of 56 [%]~86 [%] and an illumination increase of 150 [%]~290 [%] compared with the existing light.
장운용(Un-Yong Jang),정광석(Kwang-Seok Jung),박대원(Dae-Won Park),길경석(Gyung-Suk Kil),박성주(Sung-Ju Park) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This paper presented surge protective method and devices for shipboard electrical and electronics devices. Parallel type surge protective devices (SPD) for the 440 [V] and a series type SPD for the 220 [V] rated voltage were designed and fabricated. The performance were evaluated by an un-powered test which applies the 8/20 [㎲] surge current Lip to 10 [㎄]. The maximum clamping voltage of the parallel and the series type SPD were 1,032 [V] and 875 [V], respectively.
길경석,박대원,장운용,한주섭,길형준,Kil, Gyung-Suk,Park, Dae-Won,Jang, Un-Yong,Han, Ju-Seop,Gil, Hyoung-Jun 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.10
The basic performance of the ground system is evaluated as the ground resistance by applying low frequency current below 1 kHz. However, characteristics of the ground system should be analyzed by high frequency current up to 1 MHz since transient currents having a few hundred kHz component flow during a line-to-ground fault and/or a lightning strike. This paper deals with the design and fabrication of a wideband ground impedance meter (WGIM) which measures the impedance of ground systems in ranges from 65 Hz to 1.28 MHz. Also, a noise elimination algorithm using a digital bandpass filter is proposed. The maximum error of the WGIM is 4.91% in the measurement frequency range.
GYRO와 ARM을 이용한 항해 중 선박 평형 안정화 시스템
박성주(Sung-Ju Park),장운용(un-Yong Jang),양용(Young Yang),김경률(Kyung-Roul Kim),하승위(Seoug-Whi Ha),박상준(Sang-Jun Park),유재준(Jae-Jun Rue),서동환(Dong-Hoan Seo) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
This paper describes the stable system of Ship balance by using ARM(Advanced RISC(Reduced Instruction Set Computer) Machines Ltd.,) & CYRO during the voyage. Generally, the slope is controlled by using Fin stabilizer or RRS(Rudder Roll Stabilization System). Especially, the cruise must remove the vibration and noise through other balance system fer passenger. The proposed water ballast system composes of ARM BOARD, GYRO, WATER PUMP AND UPS(Uninterruptible Power Supply). When the ARM BOARD detect the signal from the GYRO and control the WATER PUMP and then get the stability. Fail Safety System also maintain the stable state from the emergency situation by using the UPS and Software.