• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.57-58
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• 2011

본 논문은 눈의 무게에 따른 압력센서의 전압변화를 이용하여 모터 구동 제어 및 제설이 가능한 방법을 제안하였다. 자동 제설 장치는 눈의 무게에 따른 압력 센서의 전압변화를 MCU의 내부 ADC를 이용하여 센서의 아날로그 값을 디지털 값으로 변환 한다. 변환한 디지털 값을 이용하여 MCU에서 무게를 판단하고, 그에 따라 모터의 구동을 제어 하게 된다. MCU의 무게 판단은 압력 센서에 가해지는 무게에 따라 변하는 압력센서의 가변저항 특성을 이용하게 되며, 직렬 저항 회로를 구성하여 압력센서의 전압 변화의 값을 ADC의 입력으로 주게 된다. 입력된 아날로그 값을 ADC로 디지털 값으로 변환하게 된다. 변환된 디지털 값을 MCU에서 판단하게 되며, 판단의 결과로 모터의 구동을 제어하게 된다. 즉, 이러한 시스템을 통하여 비닐하우스의 지붕의 눈을 실시간으로 자동 제설하게 된다.

• Journal of Digital Convergence
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• v.12 no.11
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• pp.387-393
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• 2014

In this research, we aimed to investigate the most optimum pulse wave sensor to ear label of live stocks among pulse wave piezo film sensor, conductive textile sensor, photo sensor. As a result of this research with application to 10 cattle, 10 pigs objects with pulse wave piezo film sensor, conductive textile sensor, photo sensor, photo sensor shows less standard deviation to average value than piezo film sensor or conductive textile sensor which means it is the most stable for the cattle. With pigs, piezo film sensor, conductive textile sensor and photo sensor all show stable pulse rate. Thus, to take pulse rate of livestock with curved body and long and dense coat such as cow, photo sensor will be considered as the most efficient mean.

• Journal of Sensor Science and Technology
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• v.6 no.3
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• pp.172-179
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• 1997

This paper describes a multiplexed-multivariate fiber-optic interferometric sensor system with remote sensing capability. Signal processor of the implemented sensor system is designed as a digital fringe counter that is well adapted to the signal processing of the remote fiber-optic Fabry-Perot interferometric sensor array. By summing up the reported optical data of the optical fiber, a guideline for choosing the optical effect suitable for a specific measurand is presented. As an example, a pressure sensing device that utilizes the strain-optic effect of the optical fiber by attaching it onto a stainless steel diaphragm of which diameter is 4.3 cm, is built and attached to the sensor system. The changes in optical phase difference of the fiber-optic Fabry-Perot interferometric press ure sensor while filling a water tank 2 meters high, was counted by the half-fringe counting signal processor. Test results showed that the measurement error is less than ${\pm}3.6\;cm$ over the measured range of 2 meters.

• Journal of IKEEE
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• v.7 no.2 s.13
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• pp.245-252
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• 2003

We designed a silicon pressure sensor interface circuit with digital calibration capability. The interface circuit is composed of an analog section and a digital section. The analog section amplifies the weak signal from the sensor and the digital section handles the calibration function and communication function between the chip and outside microcontroller that controls the calibration. The digital section is composed of I2C serial interface, memory, trimming register and controller. The I2C serial interface is optimized to suit the need of on-chip silicon microsensor in terms of number of IO pins and silicon area. The major part of the design is to build a controller circuit that implements the optimized I2C protocol. The designed chip was fabricated through IDEC's MPW. We also made a test board and the test result showed that the chip performs the digital calibration function very well as expected.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.440-447
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• 2002

This paper considerated about exact flow volume calculation method from factors having an influence on measurement and introduced in anesthesia ventilator realized spirometry system. System used differential pressure sensing method with factors, that is temperature, pressure, gas density, humidity and mucus etc. System optimized for low power system for mobile system. System composed analog interface part, signal processing part, display part. Analog interface part have differential pressure flow sensor and defferential pressure sensor. Signal processing part have AVR processor for low power system display part use serial port (RS232, SPT). so it display at pc monitor or send to anesthesia ventilator. System is stable by linearizing 2th characteristics of flow-differential pressure, auto correction of sensor. Noise reduced by algorithm with analog filter and digital processing. Small, light, low power system is good at mobile system and applied to patient in emergency or mobile. and, System is useful at anesthesia ventilator by using flow sensor.

• Journal of IKEEE
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• v.9 no.1 s.16
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• pp.65-71
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• 2005

Physical signals generated in the real world are transformed into electrical signals through sensors and fed into electronic circuits. The electrical signals input to electronic circuits are in analog form, thus they must be converted to digital signals using an ADC(Analog-Digital Converter) for digital processing. Signal processing circuits and ADCs that are to be integrated on a single chip together with silicon micro sensors should be designed to have less silicon area and less power consumption. This paper proposed a charge redistribution ADC which reduces silicon area considerably. The proposed method achieves 8 bit conversion by performing 4-bit conversion twice. It reduced the area of capacitor array, which takes most of the ADC area, by 1/16 when compared to a conventional method. Though it uses twice the number of clocks as a conventional method, it would be appropriate to be integrated with a silicon pressure sensor on a single chip since it does not demand high conversion rate.

• Annual Conference of KIPS
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• 2017.04a
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• pp.1131-1134
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• 2017

본 연구는 차동 용량형 섬유 압력 센서를 개발하고, 이를 깔창에 부착하여 보행 측정에 응용하는 것을 목적으로 한다. 차동 용량형 섬유 압력 센서는 3장의 전도성 섬유 사이에 2장의 절연체를 위치시키는 형태로, $5cm{\times}5cm{\times}0.23cm$ (가로 ${\times}$ 세로 ${\times}$ 두께) 크기로 제작하였다. 커패시턴스를 측정하기 위해 커패시턴스-디지털 변환칩(AD7152), ATMega328로 구성된 시스템을 제작하였고 PC로 데이터를 전송하여 모니터링을 수행하였다. 센서의 힘-커패시턴스 변화 특성 평가를 위해 센서에 가하는 중량을 65 kg 까지 5 kg 씩 증가시켜 가며 커패시턴스 변화를 측정하였다. 실험 결과, 무게에 따라 커패시턴스가 증가하는 것을 확인하였다. 보행 측정 가능성을 평가하기 위해 센서를 깔창에 부착한 후 보행 신호를 측정하였으며, 그 결과 보행에 따라 센서의 커패시턴스 값이 변화하는 것을 확인하였다. 이로부터 제작한 차동용량형 섬유 센서는 보행 측정에 활용할 수 있는 가능성을 확인하였다.

• Journal of Advanced Marine Engineering and Technology
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• v.37 no.4
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• pp.384-390
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• 2013

The sizes of cryogenic vessels and storage tanks are becoming bigger due to strong demands from semiconductor and LCD industry as well as high-tech electronic industry. Conventional level and pressure gauges used for cryogenic vessels were analog types which made exact measurement difficult for the remained quantity at lower levels due to their poor accuracy. In this study, a design for a digital type gas level gauge which can measure the pressure and level inside of the cryogenic liquefied gas storage tanks has been proposed by using a differential pressure sensor, in which the measured data are monitored by a host PC and are transferred to a mobile printer for data confirmation at local station.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.849-852
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• 2001

본 눈문에서는 뒤틀림, 응력, 압력[1], 토크, 가속도 등의 물리적인 동적 현상을 측정하여 수집된 데이터를 처리하기 위한 신호처리(Signal Processins) 기능이 결합되어 넓은 용도로 활용할 수 있는 센서 신호 수집 시스템을 구현하였다. 구현된 시스템은 data acquisition board 의 하드웨어와 소프트웨어로 나누어 볼 수 있다. 하드웨어의 구성은 아날로그부, 디지털부, 그리고 시스템 인터페이스 처리부로 되어 있다. 아날로그부에서는 센서신호를 받아서, PGA (Programmable Gain Amplifier)[2]와 Op-Amp를 사용하여 signal conditioning 처리하여 8차 Lowpass Filter 로 보낸다. Filtering 된 신호는 ADC (Analog to Digital Converter) 가 내장되어 있는 PIC(3) microcontroller로 보내져 AD변환과 디지털 신호 처리를 한다. 처리된 신호는 RS232 인터페이스를 통해 호스트 컴퓨터로 보내 사용자가 분석할 수 있도록 한다. 또한 LCD display 실시간으로 확인, 분석할 수 있으며 동시에analog output에서 센서신호의 특징을 분석 할 수 있도록 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.578-583
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• 2017

This paper presents a 3D touch pad technology that uses force touch sensors as a next-generation method for mobile applications. 3D touch technology requires detecting the location and pressure of touches simultaneously, as well as multi-touch function. We used metal foil strain gauges for the touch recognition sensor and detected the weak touch signals using Wheatstone bridge circuit at each strain gauge sensor. We also developed a touch recognition system that amplifies touch signals, converts them to digital data through a microprocessor, and displays the data on a screen. In software, we designed a touch recognition algorithm with C code, which is capable of recognizing two-point touch and differentiating touch pressures. We carried out a successful experiment to display two touch signals on a screen with different forces and locations.