• Proceedings of the IEEK Conference
• /
• 2000.09a
• /
• pp.505-508
• /
• 2000

본 논문에서는 16채널 혹은 8채널의 센서를 통해 들어오는 저주파대역의 아날로그 신호를 수집하고. 수집된 데이터를 실시간으로 처리하기 위한 고속의 신호처리 기능이 결합된 통합 DSP (Digital Signal Processor)시스템을 구현하였다. 구현된 시스템은 휴대가 용이하도록 소형으로 설계되어 있으며 노트북 등의 이동형 장비에 활용되도록 USB 인터페이스를 채택하였으며, 장치간의 네트워크 구성이 가능하도록 Ethernet 인터페이스를 추가하였다 Digital Signal Processor는 Texas Instrument 사의 TMS320C6701 부동소수점 연산방식의 고성능 DSP를 사용하여 16채널의 실시간 신호 분석이 가능하게 하였으며, ICP 센서 구동용 전류 공급부를 내장하여 센서 선택의 폭을 넓히었고, programmable gain amplifier인 PGA202증폭기를 사용하여 입력신호가 작을 경우 최대 1000배, 즉 60dB까지 입력신호를 증폭하여 수집 및 분석할 수 있다. 200kSPS의 샘플링 레이트와 16bit resolution을 가지는 AD976 A/D converter를 사용하여 채널당 0～6kHz의 신호대역폭을 가지며,differential 입력시 8 채널,single ended 입력시 16 채널의 입력 신호의 수집 및 분석이 가능하다. Windows 응용프로그램에서는 사용자가 원하는 입력신호 및 스펙트럼 실시간 분석, 입력신호 기록 및 저장, RPM 측정 및 분석, 외부 트리거 및 레벨 트리거를 이용한 입력신호 제어와 수집된 데이터를 바탕으로 원하는 제어가 가능한 응용프로그램 제작에 활용될 라이브러리가 포함된다.

• Journal of Biosystems Engineering
• /
• v.23 no.1
• /
• pp.83-90
• /
• 1998

In this paper the automatic system for dairy cattle has been desisted such as body temperature measuring unit, feed supplying unit and temperature control unit. Since e disease is strongly related to the body temperature of cattle, early detection of the abnormal temperature would prevent the severe problems which nay occur in dairy farms. An electronic component AD590J is used as temperature sensor for the system, The device is highly robust against the noise since the output signal is the current so it can be applied to a long distance sensing The resolution of signal is 0.1$^{\circ}C$ and the current is 10㎷ Also 12-bit A/D converter is desisted fir interfacing the sensor with a one-chip microprocessor. A temperature measuring experiment using the developed system has been done for measuring the temperature of human beings and the system was proven to be useful for measuring the body temperature of dairy cattle properly. A geared AC motor is used for the feed supplying unit The heater and fm are used as temperature control unit. The feed supplying unit and temperature control unit are well operating in the laboratory experiment.

• Proceedings of the KIPE Conference
• /
• 2008.06a
• /
• pp.49-51
• /
• 2008

본 논문은 중용량급 전원회로의 구성을 간략화 할 수 있는 절연형 AC-DC 컨버터의 구조와 그 제어 방법을 제안한다. 제안하는 회로의 구조는 병렬 전력 처리를 기반으로 한다. 병렬 모듈의 기능을 각각 AC 입력 전류의 위상을 제어하는 역률개선(PFC) 기능과, 콘덴서에 저장된 에너지를 이용하여 DC 전압을 생성하는 DC-DC 컨버터의 기능으로 분리한다. 병렬 모듈의 최종 출력단을 서로 직렬 연결하여, PFC 모듈이 생성한 전압과 DC-DC 컨버터 모듈이 생성한 전압을 서로 더해서 출력하는 구조이다. 이러한 구조를 통해서 기존의 병렬형 AC-DC 컨버터에 대비하여 반도체 소자의 내압을 감소시킬 수 있고, 최종 DC 전압의 동작응답특성 향상이 가능하다. 회로의 동작모드 분석이 실시되었고, 제어기 구현 방법이 제시되었다. 제안된 구조는 PDP 전원회로에의 응용을 위해서 400W(출력전압-200V, 출력전류-2A)급 실험용 회로를 구현하여 동작검증을 실시하였다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.22 no.9
• /
• pp.833-839
• /
• 2011

This paper has suggested a technique for measuring VSWR at 1.8 GHz band for various modulated signals. By using directional coupler the power of incident and reflected wave is measured, and in order to minimize the size and cost of the measuring circuit, a SPDT(Single Pole Double Throw) switch is adopted to realize the circuit with just one detector and one A/D(Analog to Digital) converter. MCU(Micro Control Unit) is used to calculate the voltage reflection coefficient and VSWR, and the measured VSWR error has improved by approximately 0.2 with applying a simple bubble sorting algorithm to reduce the measurement error, the MCU process time and load.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.17 no.1
• /
• pp.19-24
• /
• 2017

Nowadays, based on the advancement of IT techniques, innovative products combining IT techniques to PA system are developing. In this paper, we presented the hybrid mixer controller for digital PA system. We develop the integrated mixer controller which includes the digital mixer composing an existing digital PA system and function of digital integrated controller. Developed integrated mixer controller consists of multichannel mixer function with 16 audio input channels, 8 output channels. And, it has an equalizer for processing digital audio signal, matrix and limiter. Also, the developed controller has some features such as internet connection for controlling of overall PA system and remote monitoring of mixer process condition.

• 제어로봇시스템학회:학술대회논문집
• /
• 1992.10b
• /
• pp.503-508
• /
• 1992

A new method for making automatic electroencephalogram(EEG) report based on the automatic quantitative interpretation of awake EEG was developed. We first analysed a. relationship between EEG reports and quantitative EEG interpretation done by a qualified electroencephalographer(EEGer) for 22 subjects. Based on the analysed relationship and usual process of report making by the EEGer, we defined all terminology necessary for EEG report and established rules for EEG report making. By the combined use of the proposed EEG report making and the method for automatic quantitative EEG interpretation presented at '90 KACC, we were able to make the automatic EEG reports which were equivalent to the EEG reports written by the EEGer. As all the procedures were programmed in a personal computer equipped with an AD (analogue-to-digital) converter, the automatic EEG reports were obtained in almost real time in usual actual EEG recording situation with only a few seconds time lag for the analysis in the computer. The proposed report making method and the quantitative EEG interpretation method will be effectively applicable to the clinical use as an assistant tool for physicians.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2000.11a
• /
• pp.225-230
• /
• 2000

This paper describes a double-ended current fed push-pull type high frequency resonant inverter used as the power supply for wax-sealing. The proposed inverter can realize ZVS operation by using resonant capacitor to ZVS capacitor and has some merits not only reduction of switch current distribution but also extension of load range compare to the conventional single-ended current fed push-pull type high frequency resonant inverter. This analysis of proposed circuit uses normalized parameter ad characteristic estimation which is needed in each step before design is generally described according to normalized frequency($\mu$), normalized resistance(λ) and parameters. It is also presented as an example of method of the circuit design based on estimation analysis values from theoretical analysis. The theoretical analysis is proved through experiment and this circuit shows that it can be used practically as the power supply system for wax-sealing and DC-DC converter.

• Agricultural and Biosystems Engineering
• /
• v.6 no.1
• /
• pp.15-21
• /
• 2005

This study was conducted to develop a nondestructive grouping system for soil organic matter using visible (VIS) and near infrared (NIR) spectroscopic method. The artificial light was irradiated on the cut soil surface at 15 to 20 cm depths to reduce the errors of light at open field. The reflectance energy from the cut soil surface was measured to group the soil organic matter using VIS/NIR light sensor with narrow band pass filter. From reflectance spectra of soil samples, the sensitive wavelengths for measuring the soil organic matter were selected and compared to previous research results. The grouping system for soil organic matter consisted of light sensor with band pass filter measuring the reflectance energy of the cut soil surface, global positing system (GPS), analog-to-digital (AD) converter, computer and operating software. The regression models to predict the soil organic matter were developed and evaluated. From field test, the accuracies of the developed light sensor system were 81.3% for five-stage grouping of the soil organic matters and 91.0% for three-stages grouping of the soil organic matters, respectively. It could be possible to support the decision making for variable rate applications with the developed grouping system for soil organic matter in precision agriculture.

• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.23 no.6
• /
• pp.539-546
• /
• 2014

This paper describes an ultra-precision electronic clinometer, which is based on the capacitive-based fluid type, for detection of small inclination angles. The main parts of the clinometer low-noise electronics are two capacitance measurement circuits for converting the capacitances of the capacitors of the clinometer into voltages, and a differential amplifier for obtaining the difference of the capacitances, which is proportional to the input inclination angle. A 16 bit analog to digital (AD) converter is also embedded into the same circuit board, whose output is sent to a PC via RS-232C, for achieving a small noise level down to tens of ${\mu}v$. A compensation method, which is referred to as the delay time method for shortening the stabilization time of the sensor was also discussed. Experimental results have shown the possibility of achieving a measurement resolution of $0.0001^{\circ}$ as well as the quick measurement with the delay time method.

• Journal of the Semiconductor & Display Technology
• /
• v.3 no.1
• /
• pp.21-26
• /
• 2004

Recently with the development of power switching device and DSP which has peripheral devices to control AC servo system, the servo technology has met a new development opportunity. Those things make it possible to reduce the time of developing a AC servo system. Fixed point DSP such as TMS320F240x, and TMS320F28x series have a disadvantage in calculating floating number where TMS320C32 or TMS320C31 are floating point DSP. However they usually become a complex hardware system to implement the AC servo system and it increases the cost. In this study, a DSP based AC servo system with a 3-phase PMSM is proposed. The newly produced DSP TMX320F28l2-version C which has the performance of fast speed, 150MIPS, and a rich peripheral interface such as a 12bit high speed AD converter, QEP(Quadrature Encoder Pulse) circuit, PDPINT(Power Drive Protect Interrupt), SVPWM module and dead time module are used. This paper presents a method to overcome fixed point calculating using scaling all parameters. Also space vector pulse width modulation (SVPWM) using off-set voltage and a digital PI control are implemented to the servo system.