• 한국초전도학회:학술대회논문집
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• v.10
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• pp.169-172
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• 2000

We have constructed a multi-channel SQUID magnetometer system. The system is designed to operate normally with 10 high temperature direct coupled SQUIDs. The main features of the system include a remote control by serial communication, low noise with wide bandwidth and high slew rate by several MHz modulation, signal conditioning and calibration by digital signal processing.

• Publications of The Korean Astronomical Society
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• v.20 no.1 s.24
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• pp.73-83
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• 2005

On-The-Fly (OTF) observation method is developed for the efficient use of 6 M radio telescope at Seoul Radio Astronomy Observatory (SRAO). This technique, in which data and information of antenna position are recorded synchronously while driving a telescope regularly and rapidly across a field, provides more efficient use of telescope time and better calibration of the acquired data than the traditional point-to-point observation method does. For the realization of the method, we (1) added RT-Linux modules to the existing operating system, (2) replaced digital voltmeter with voltage-to-frequency converter, and (3) modified many SRAO observation programs. By observing Moon and G78.2+2.7 using this method and comparing them with previous observations, we verify the successful operation and efficiency of the OTF observation mode.

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.5-6
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• 2013

오늘날 디스플레이 기술의 진화는 건축물의 외벽은 물론 조형물에 영상을 구현할 수 있게 되었다. 프로젝션 맵핑은 입체감 있는 가상영상을 실내외는 물론 조형물에 덧입힘으로서 새로운 공간으로 탈바꿈시키는 영상표현 방법의 하나이다. 본 연구에서는 프로젝션 맵핑 제작과정에 있어서 색보정이 영상의 입체감에 영향이 미치는지 실험을 통해 검증하고 이를 통하여 프로젝션 맵핑제작에 있어서 효과적인 프로세서에 대한 정보를 제공 하고 확립하는 것이 본 연구의 목적이다. 프로젝션 맵핑은 예술뿐만 아니라 산업전반에 영향력을 주고 있다. 이처럼 새로운 디지털 기술에의한 미디어의 발달과 미디어의 발달에 따른 새로운 표현양식의 등장은 앞으로도 계속될 것이다. 본 연구를 토대로 프로젝션 맵핑 제작에 있어서 유익한 연구의 기초로 활용되었으면 한다.

• Journal of Sensor Science and Technology
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• v.27 no.1
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• pp.21-24
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• 2018

A temperature sensor with a binary output was implemented using switched-capacitor circuits in a $0.35-{\mu}m$ CMOS(com-plementary metal-oxide semiconductor) process. The measured temperature exhibited good agreement with the oven temperature after calibration. The measured power consumption was 5.61 mW, slightly lower than the simulated power consumption of 6.63 mW.

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2066-2068
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• 1999

In this paper, an optical fiber sensor(OF sensor) utilizing the principal of Sagnac interferometer was proposed to detect the discharge signals which generated from needle-sphere electrode system in insulating oil. The performance of OF sensor was checked by sinusoidal calibration signal generated by PZT acuator at 198kHz. The detected discharge signals consisted of acoustic signal and the electrical noise. The noise signal could be removed by digital low pass filter. It was demonstrated that the OF sensor in this research had a possibility to detect the discharge signals in power apparatus.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.983-984
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• 2006

Multi-band VCO with fast response adaptive frequency calibration (AFC) technique is designed in 1.8V $0.18{\mu}m$ CMOS process. The possible operation is verified for 5.8GHz band, 5.2GHz band, and 2.4GHz band using the switchable L-C resonators for 802.11a/b/g WLAN applications. To linearize its frequency-voltage gain, optimized multiple MOS varactor biasing technique is used. In order to operate in each band frequency range with reduced VCO gain, 4-bit digitally controlled switched-capacitor bank is used and a wide-range digital logic quadricorrelator is implemented for fast frequency detector.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.11a
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• pp.137-139
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• 2016

본 논문에서는 비평면 디지털 사이니지 서비스를 제공하기 위해서 투사될 다수의 콘텐츠 들을 스크린 환경에 맞춰 동적으로 보정하는 시스템의 설계와 구현을 다룬다. 제안기술은 다양한 형태의 사물 표면을 스크린으로 활용하여 디지털 사이니지 서비스를 쉽게 제공할 수 있도록 하는데 필요한 보정 시스템에 관한 것으로 동적으로 기하학적 구성정보 및 주변 환경 정보를 감지하여 콘텐츠를 적절하게 보정할 수 있으며 향후 디지털 사이니지 서비스뿐만 아니라 공연이나 전시와 같은 다양한 분야에도 활용이 기대된다.

• Journal of Advanced Marine Engineering and Technology
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• v.31 no.5
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• pp.531-542
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• 2007

Simultaneous measurement technique for temperature and velocity fields near a heated solid body has been constructed. The measurement system consists of a 3-late CCD color camera, a color image grabber, a 1ighting system, a host computer and a software for the whole quantification process. Thermo Chromic Liquid Crystals (TCLC) was used as temperature sensors. A neural network was used to get a calibration curve between the temperature and the color change of the TCLC in order to enhance the dynamic range of temperature measurement. The velocity field measurement was attained by the use of the fray-level images taken for the flow field, and by introducing the cross-correlation technique. The temperature and the velocity fields of the forced and the natural convective flows neat the surface of a cartridge heater were measured simultaneously with the constructed measurement system.

• Proceedings of the IEEK Conference
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• 2001.06e
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• pp.25-28
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• 2001

This paper introduce a millimeter-wave radar system. As Fig 1 shows, This system consists of millimeter-wave radar front-end and digital signal processing parts through receive waves regarding up-coming obstacles. The system works as follow process; (1) Generate regular tripodal waves using the FMCW pulse generator (2) Transmit/Receive waves regarding up-coming obstacles (3) Analog filtering (4) FIFO memory interface (5) FFT(Fast Fourier Transform) (6) Calculation of distance / speed between cars (7) Object display and calibration. We have progress to solve the problem like as increase of traffic accidents causing damage and injuries due to the increased number of motor vehicles and long distance driving, and Need for a device to help drivers who are in trouble due to bad weather conditions. We are expect to Take the lead as a core technology in the ITS industry and to develop circuit and signal processing technologies related to millimeter-wave bandwidth.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3162-3164
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• 1999

In this paper, a temperature compensating system(TCS) for LPG dispenser has been developed. A TCS includes a processor(80C196) with an AID converter. I/O port(82C55) and 6-digit vacuum fluorescent display. Based on encoding signals from the gas flow meter, different calibration values from each apparatus and temperature compensating values from the temperature sensor, the TCS controls the LPG dispensing quantity with switching on or off the solenoid valves. The temperature compensation is performed with analog-to-digital conversion of the temperature sensor. The resolution of temperature compensation is nearly $0.5^{\circ}C$ using 10-bit ADC. The field test of the TCS shows the exact temperature compensation.