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김재용,조수영,강태삼,이호준,고광일,Kim, Jae-Yong,Cho, Su-Young,Kang, Tae-Sam,Lee, Ho-Joon,Koh, Kwang-Ill 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.10
The temperature difference occurs at the test points of chamber, because the traditional Test Handler consists of a heater and a fan. To reduce the temperature variation at different points in the chamber, we divided the heater to three parts which are controlled independently. First, we identified the chamber's parameter and then designed a LQG controllers by the identification model. RTD sensors and VME system were used to construct the temperature control system. In our experiment for the proposed control system, the temperature variation was reduced from ${\pm}1.5^{\circ}C$ to ${\pm}0.35^{\circ}C$ at 50$^{\circ}C$ ${\cdot}$ 80$^{\circ}C$ and 120$^{\circ}C$. 기존의 테스트 핸들러는 단일 히터와 팬을 사용하여 항온조내의 IC 테스트점들 사이에 온도 편차가 발생한다. 본 논문에서는 온도 분포가 중간 부분과 가장자리 부분의 온도 오차가 심한 문제에 착안하여, 기존의 히터를 3등분하여 3지점의 온도를 각각 제어함으로써 측정점의 위치에 따라 온도 편차를 줄이는 방안을 제시하였으며, 온도 챔버의 파라미터의 식별과 식별된 모델에 기초하여 LQG 제어기를 설계하였다. 항온조의 온도를 일정하게 유지하기 위하여 RTD 센서와 VME 시스템을 이용하였다. 실험 결과 챔버의 위치에 따른 온도 편차를 50$^{\circ}C$ ${\cdot}$ 80$^{\circ}C$와 120$^{\circ}C$에서 기존의 ${\pm}1.5^{\circ}C$에서 ${\pm}0.35^{\circ}C$로 줄임으로써 그 성능을 개선하였다.
FPGA를 이용한 피에조 부하 구동용 고전압 단방향 인버터의 PI 및 히스테리시스 전압 제어 특성 비교
김기석,조용호,김형섭,강태삼,홍선기,Kim, Ki-Seok,Cho, Yong-Ho,Kim, Hyeong-Seop,Kang, Tae-Sam,Hong, Sun-Ki 대한전기학회 2017 전기학회논문지 Vol.66 No.1
In this paper, hysteresis voltage control method is proposed to an unidirectional inverter control for piezoelectric load. Piezoelectric load has electrically RC characteristic, and is driven by the inverter to control the output voltage waveform. When controling the output waveform by PI control, appropriate gains need to be selected. However, hysteresis control may minimize the output distortion because it has maximum proportional gain. In addition, Hysteresis control algorithm has simple structure to realize and the response is fast. Although the switching frequency of the inverter by hysteresis control varies, the switching frequency for the piezoelectric load is lower than that by PI control for equivalent performance. In particular, on implementing the algorithm using FPGA, the algorithm can be implemented in fewer pabrics and the processing time can be reduced. The superiority of the proposed hysteresis voltage control was proved for piezoelectric load through simulation and experiment.
현철 ( Chul Hyun ),강태삼 ( Tae Sam Kang ) 한국센서학회 2012 센서학회지 Vol.21 No.3
In this paper, signal detection and control circuits for hemispherical resonator gyroscope(HRG) are designed, simulated and tested. HRG is one of the coriolis vibratory gyroscope(CVG) which has very stable quartz hemispherical resonator and shows very precise performance. HRG signals are usually modulated at the several kHz of resonant frequency. So the general control scheme cannot be applied directly because general control schemes mainly focused at low frequency range. Using demodulated and modulated PI control scheme with the signal detection which is presented in this paper, performance of manufactured HRG has tested.
Sokoeun Un,전창완(Chang-Wan Jeon),강태삼(Tae-Sam Kang) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.4
In this paper, a multi-vehicle display navigation system is developed. The system enables the display of another vehicle’s position together with the vehicle"s own position. The system"s hardware is composed of an android mobile phone, a computer, and Wi-Fi equipment. The software includes multi-vehicle display navigation software, an android app installed on the mobile phone, and a socket program for communication. The navigation software receives the position sent from the other vehicle via the mobile phone and displays that position together with its own position. Visual C++ and Java are used to develop the navigation system software and the android software, respectively. Navigation position data collected through real driving tests are used to validate the developed system.
김정환 ( Jung Hwan Kim ),박한빈 ( Han Bin Park ),강태삼 ( Tae Sam Kang ),박정근 ( Jung Keun Park ) 한국센서학회 2014 센서학회지 Vol.23 No.1
We developed a low-cost automatic diagnosis system for water quality in cooling towers to measure the concentrations of key ingredients such as Ca2+, Cl-, PO4 3-, and Fe2+. Ca2+, and Cl- are the main factors that cause the generation of scale, corrosion, and sludge in water pipes. PO4 3- prevents corrosion, sludge and scale by inhibiting the ions (i.e., Ca2+, Cl-) from sticking to the pipes. Fe2+ is an indicator of pipe corrosion. The proposed system consists of a microprocessor, a specimen container and heater, a precision pump, relays and valves, LED optical sources, and photo detectors. It automatically collects water samples and carries out pretreatment for determining the concentration of each chemical, and then estimates the concentration of each ion using low-cost LED optical sources and detectors. Experimental results showed that the accuracy of the proposed system is sufficiently high for water quality diagnosis and management of cooling towers, demonstrating the possibility of the proposed system`s wide usage in real environments.