• 제목/요약/키워드: 신호처리 장치

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Development of a Signal Acquisition Device to Verify the Applicability of Millimeter Wave Tracking Radar Transmission and Receiving Components (밀리미터파 추적레이더 송·수신 구성품의 적용성 검증을 위한 신호획득장치 개발)

  • Jinkyu Choi;Youngcheol Shin;Soonil Hong;Han-Chun Ryu;Hongrak Kim;Jihan Joo
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.23 no.6
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    • pp.185-190
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    • 2023
  • Recently, tracking radar requires the development of millimeter wave tracking radar to acquire target information with high resolution in various environments. The development of millimeter wave tracking radar requires the development of transmission and receiving components that can be applied to the millimeter wave tracking radar, as well as verification of the applicability of the tracking radar. In order to verify the applicability of the developed transmitting and receiving components, it is necessary to develop a signal acquisition device that can control the transmitting and receiving components using the operating concept of a tracking radar and check the status of the received signal. In this paper, we implemented a signal acquisition device that can confirm the applicability of components developed for millimeter wave tracking radar. The signal acquisition device was designed to process in real time the OOOMHz center frequency and OOMHz bandwidth signals input from 4 channels to verify the received signal. In addition, component control applying the tracking radar operation concept was designed to be controlled by communication such as RS422, RS232, and SPI and generation of control signals for the transmission and receiving time. Lastly, the implemented signal acquisition device was verified through a signal acquisition device performance test.

An implementation of the continuous wave doppler system for blood flow measurement using the ultrasound (효율적인 혈류 속도 측정을 위한 연속 초음파 도플러 장치의 구현)

  • 박형재;김영길
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.05a
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    • pp.516-519
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    • 2001
  • To diagnose a patient's blood vessel disease, apoplexy, hypertension, arteriosclerosis, the blood velocity is very important. Determining the blood velocity methods using ultrasound are Continuous Doppler System and Pulse Doppler System. In using the Pulse Doppler System, we can obtain the position of blood velocity. But it is more complex hardware than Continuous Doppler System and it has low SNR(signal-noise ratio). So in this study, to obtain a believable information we use the Continuous Pulse Doppler System. Thus system have analog part and digital part. In analog part is composed of ultrasound generating part, the amplifying part to amplify the received signal from ultrasound sensor, the demodulation part to detect blood velocity and the filtering part to remove the noise. In digital part is composed of the A/D conversion part, digital signal processing part, and the communication part to communicate the PC. In this study to implement efficient ultrasound blood velocity measurement system, we can get the patient's blood velocity information in realtime. Thus, It is a useful in the accurate diagnosis with C.T(computered tomography), M.R.I(magnetic resonance imaging).

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The Realization of Panoramic Infrared Image Enhancement and Warning System for Small Target Detection (소형 표적 탐지를 위한 파노라믹 적외선 영상 향상 장치 및 경보시스템 구현)

  • Kim Ki Hong;Kim Ju Young;Jung Tae Yeon;Jeon Byung Gyoon;Lee Eui Hyuk;Kim Duk Gyoo
    • Journal of Korea Multimedia Society
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    • v.8 no.1
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    • pp.46-55
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    • 2005
  • In this paper, we realize the panoramic infrared warning system to detect the small threaten object and propose the infrared image enhancement method to improve the warning ability of this system. This system composes of the sense head unit, the signal processing unit, and so on. In the proposed system, the sense head unit acquires the panoramic IR image with 360 degree field of view(FOV) by rotating the thermal sensor. The signal processing unit divides panoramic image into four sub-images with 90 degree FOV and computes the adaptive plateau value by using statistical characteristics of each subimage. Then the histogram equalization is performed for each subimage by using the adaptive plateau value. We realize the signal Processing unit by using the DSP and FPGA to perform the proposed method in real time. Experimental results show that the proposed method has better discrimination and lower false alarm rate than the conventional methods in this warning system.

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Implementation of Automatic Test System for Voice Recognition (음성인식 자동시험장치 개발)

  • 김희경
    • Proceedings of the Acoustical Society of Korea Conference
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    • 1998.06e
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    • pp.219-222
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    • 1998
  • 음성인식시험은 다양한 사용자의 음성을 입력으로 음성인식을 수행하고 그 결과를 이용하여 시스팀의 성능을 평가하거나, 음성의 특징을 파악하기 위한 중요한 기능으로 음성인식 서비스의 질을 향상시키기 위한 필수적인 요소이다. 본 논문에서 제시하는 음성인식 자동시험장치는 음성인식의 결과를 DTMF 신호로 처리하도록 하여 사람의 개입 없이 빠르고 정확한 결과를 통해 인식율, 인식속도 등 인식기술과 관련된 중요한 정보를 얻을 수 있도록 하였다. 본 논문에서는 한국통신의 기업체 음성다이얼서비스의 음성인식시험을 중심으로 음성인식 자동시험장치의 구성 및 기능에 대해서 설명한다.

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수면생리신호처리 연구

  • 김원식;박세진;신재우;윤영로
    • Proceedings of the ESK Conference
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    • 1997.10a
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    • pp.381-385
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    • 1997
  • 수면생리신호는 ${\mu}V ~ {\mu}V$ 급으로서 미소하므로 고이득 증폭기를 이용하여 기록하는데 이때 외부에서의 전기적 잡음이 혼입된 경우 그 잡음까지 기록되어 기록 파형으로 부터의 수면단계 해석에 오류를 초래한다. 일반적으로 수면기록장치에는 주관심 주파수대역이 낮으므로 하드웨어에서 기본적으로 저역필터링을 수행할뿐아니라 소프트웨어에서 전원잡음을 필터링하는 기능을 제공한다. 그렇지만 이러한 필터링에도 불구하고 실제에는 예기치 못하는 전기적 잡음이 혼입되어 있을 수 있으므로 본 연구에서는 Medilog SAC847(Sleeping Analysing Computer) 다원수면기록장치(Polysomnograph)를 이용하여 수면생리신호들을 측정한 뒤 SAC847 본체에 기록 저장된 raw signal을 자체 제작한 Data Acquisition System으로 읽어들여 Matlab 으로 FFT 시켜본 결과 여전히 전원잡음이 관측되어 60 Hz notch 필터를 설계하여 완전히 제거할 수 있었다.

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A Novel Model, Recurrent Fuzzy Associative Memory, for Recognizing Time-Series Patterns Contained Ambiguity and Its Application (모호성을 포함하고 있는 시계열 패턴인식을 위한 새로운 모델 RFAM과 그 응용)

  • Kim, Won;Lee, Joong-Jae;Kim, Gye-Young;Choi, Hyung-Il
    • The KIPS Transactions:PartB
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    • v.11B no.4
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    • pp.449-456
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    • 2004
  • This paper proposes a novel recognition model, a recurrent fuzzy associative memory(RFAM), for recognizing time-series patterns contained an ambiguity. RFAM is basically extended from FAM(Fuzzy Associative memory) by adding a recurrent layer which can be used to deal with sequential input patterns and to characterize their temporal relations. RFAM provides a Hebbian-style learning method which establishes the degree of association between input and output. The error back-propagation algorithm is also adopted to train the weights of the recurrent layer of RFAM. To evaluate the performance of the proposed model, we applied it to a word boundary detection problem of speech signal.

비행체 구조시험 장비의 교정 확인 방법 개발

  • Chae, Dong-Chul;Kim, Sung-Chan;Hwang, Gui-Chul;Shim, Jae-Yeul
    • Aerospace Engineering and Technology
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    • v.4 no.2
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    • pp.21-26
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    • 2005
  • In airframe structural tests, a control system which has many control channels and a data acquisition system which has many data acquisition channels are used. The more it is used many channels in airframe structural test, the more hardware resources are added in test system. Before test load is applied in test article, test engineer must check test system and components. Therefore, many problems which be likely to happen to system can be minimized. The checking method of test system and components is calibration verification. In this paper, it is described that calibration verification concept and method in relation to airframe structural test controller components.(MTS Aero90 Multifunction Input Output Processor and 497.22 Dual DC Conditioner)

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Design of RF Front-end for High Precision GNSS Receiver (고정밀 위성항법 수신기용 RF 수신단 설계)

  • Chang, Dong-Pil;Yom, In-Bok;Lee, Sang-Uk
    • Journal of Satellite, Information and Communications
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    • v.2 no.2
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    • pp.64-68
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    • 2007
  • This paper describes the development of RF front.end equipment of a wide band high precision satellite navigation receiver to be able to receive the currently available GPS navigation signal and the GALILEO navigation signal to be developed in Europe in the near future. The wide band satellite navigation receiver with high precision performance is composed of L - band antenna, RF/IF converters for multi - band navigation signals, and high performance baseband processor. The L - band satellite navigation antenna is able to be received the signals in the range from 1.1 GHz to 1.6 GHz and from the navigation satellite positioned near the horizon. The navigation signal of GALILEO navigation satellite consists of L1, E5, and E6 band with signal bandwidth more than 20 MHz which is wider than GPS signal. Due to the wide band navigation signal, the IF frequency and signal processing speed should be increased. The RF/IF converter has been designed with the single stage downconversion structure, and the IF frequency of 140 MHz has been derived from considering the maximum signal bandwidth and the sampling frequency of 112 MHz to be used in ADC circuit. The final output of RF/IF converter is a digital IF signal which is generated from signal processing of the AD converter from the IF signal. The developed RF front - end has the C/N0 performance over 40dB - Hz for the - 130dBm input signal power and includes the automatic gain control circuits to provide the dynamic range over 40dB.

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KIM-1 microcomputer를 이용한 low-cost image processor 설계에 관하여

  • 유근호
    • 전기의세계
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    • v.30 no.12
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    • pp.793-796
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    • 1981
  • 최근 우리나라에도 digital image processing에 대한 연구가 활발이 진행되고 있다. 또한 digital image processing의 생체공학에의 응용도 괄목할 만하다. 이러한 연구와 응용에 도움이 되고자 microcomputer를 이용한 image processor설계의 실례를 기술하고자 한다. 이 설계는 목적 image를 stationary image로 가정하여 TV카메라의 영상신호를 sample하여 computer 기억장치에 저장하므로 가격이 저렴하게 된다. 이러한 장치로서는 DMA연결 (Direct Memory Access interface)을 사용하여 빠른 data transfer를 달성할 수 있다. Digital image processing계는 기본적으로 microcomputer가 TV카메라와 TV모니터에 연결된 구조를 하고 있다. Computer가 기억장치에 저장된 data를 처리하여 필요한 정보를 얻게 된다. 이러한 data 처리를 하므로서 image를 사용자가 해석하기 쉽도록 image질을 향상시키거나 computer가 image를 인식하게 한다. 이와같이 처리된 image는 TV모니터를 통해서 볼 수 있다. 본지에서는 256x256개의 pixel들로 이루어지고, 각개의 pixel은 4개의 bit로 구성된 image processor의 설계를 기술한다.

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Implementation of the Multi-channel Vital Signal Monitoring System for Home Healthcare (홈 헬스케어를 위한 다채널 생체신호 모니터링 시스템 구현)

  • Youn, Jeong-Yun;Jeong, Do-Un
    • Journal of the Institute of Convergence Signal Processing
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    • v.11 no.3
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    • pp.197-202
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    • 2010
  • In this paper, multi-channel vital signal monitoring system was implemented for home healthcare. The system able to measure vital signal for example ECG, PPG and temperature simultaneously at patients’ home. The vital signal is an essential parameter for healthcare application and can be easily extracted from patients. The implemented system consist of sensor parts for signal extraction, signal amplifier and filter for analog circuit, analog signal to digital conversion for controlling devices and lastly the monitoring program. The system able to transmit vital signals using Bluetooth wireless communications to personal computer or home server. And the tele-monitoring system able to display real-time signals using web monitoring program. In medical application, the vital signal parameter able to stored and saved in the web server for further medical analysis. This system opens up the possibilities of ubiquitous healthcare where further implementation can be easily done.