• Journal of the Institute of Convergence Signal Processing
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• v.20 no.1
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• pp.45-50
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• 2019

When PPG signal is used in mobile healthcare devices, the accuracy of the measured heartbeat decreases from the influence by the movement of the user. The reason is that the frequency band of the noise overlaps the frequency band of the PPG signal. In order to remove these same noises, the methods using frequency analysis method or application of acceleration sensor have been investigated and showed excellent performance. However, in applying these methods to low-cost healthcare devices, it is difficult to apply these methods because of much processing time and sensor's cost. In order to solve these problems, this study proposed the filter design method using an adaptive notch filter and the fuzzy inference system to extract more accurate heart rate in real time and evaluated its performance. As results, it showed better results than the other methods. Based on the results, when applying the proposed method to design the mobile healthcare device, it is possible to measure the heartbeat more accurately in real time.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.877-878
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• 2013

• Journal of Biomedical Engineering Research
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• v.8 no.1
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• pp.1-6
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• 1987

In this study, we described the result of computer simulation which is real time extraction of FECG and FHR using adaptive digital signal processing. And we designed 2 channel cassette interface circuit to save FECG signal.

• Journal of the Korean Data and Information Science Society
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• v.28 no.5
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• pp.1001-1019
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• 2017

The signal processing is a field of the electrical engineering but it is very much related with the time series analysis. Thesedays the commercial softwares are widely used by the reseachers. We have attempted to make a guide for using the R-package in the digital signal processing. It would be good to read the materials in each section first and to follow the plots in the section 8 and to run the attached R-codes. The article consists of (1) Fourier transform and Fourier inverse transform, (2) spectral analysis (3) parametric and non-parametric estimation for the period (4) filter design. Simple theoretical explanations are provided and R implementations are added.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.12
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• pp.1245-1250
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• 2016

In this study, smart laser pointer using image processing was studied. The laser pointer tracked the light by using image processing. and the tracking signal was received to the transmitting unit. Smart laser pointer received the video signal have function of erase, write convert window, and changing of font color. It was studied that the smart laser pointer system could run pointer and mouse function on the one place.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.367-370
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• 2021

스마트 시티에서 교차로의 통행을 관리하는 교통신호 시스템 분야의 목표는 교통 혼잡 최소화 및 처리량 최대화이다. 현재, 신호 제어 시스템은 고정형 시스템을 사용하고 있으며, 효율적이고 유동적으로 교통을 제어하기 위해 적응형 방식의 교통신호 제어 연구가 활발히 진행 중이다. 적응형 방식의 교통신호 방식 중에서 고정된 신호 순서에 상황에 맞는 신호시간을 할당하는 방법이 있다. 본 논문은 고정된 신호 순서가 교통 신호 성능에 미치는 영향을 분석하였다. 그 결과, 신호 순서가 교통신호 성능에 미치는 영향도가 크지 않다는 것을 확인할 수 있었다.

• Journal of the Institute of Convergence Signal Processing
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• v.6 no.3
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• pp.143-147
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• 2005

Monitoring and diagnosis of the operating machines are very important for safety operation and maintenance in the industrial fields. These machines are most rotating machines and the diagnosis of the machines has been researched for long time. We can easily see the faulted signal of the rotating machines from the changes of the signals in frequency. The Linear Predictive Coding(LPC) is introduced for signal analysis in frequency domain. In this paper, we propose fault detection and diagnosis method using the Linear Predictive Coding(LPC) and residual signal energy. We applied our method to the induction motors depending on various status of faulted condition and could obtain good results.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2005.11a
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• pp.246-249
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• 2005

음향 시스템에 있어서 하울링 현상은 음성 레벨을 제한함으로써 음성의 명료도를 저하시키는 주된 요인이다. 그리고 이를 해결하기 위한 방법으로 하울링 주파수 대역의 게인을 낮추어 음향신호의 피드백을 최소화 하는 것이 일반적이기 때문에 하울링 주파수를 찾아내는 것이 하울링 제어에 있어서 가장 핵심적인 요소가 된다. 그래서 본 논문에서는 하울링 주파수를 자동으로 검출할 수 있는 기법을 제시하였다. 이는 외부로부터 입력된 오디오신호가 하울링 신호 특성을 만족하는 정도를 ‘하울링 지수’라는 파라메터로 정의한 후 이를 기준으로 하울링 발생여부를 판단하고 하울링으로 판별된 신호의 최대 진폭을 갖는 주파수를 하울링 주파수로 출력하는 기법이다. 본 하울링 신호 자동 검출기법의 내용을 검증하기 위하여 하울링 자동 검출 프로그램을 제작하여 실험을 수행한 결과 전체 하울링 신호의 95% 이상을 검출할 수 있었다.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.40 no.5
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• pp.333-340
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• 2003

Doppler processing is the heart of pulsed Doppler radar. It gives a clutter elimination and coherent integration. With the improvement of digital signal processors (DPSs), the implementation using them is more widely used in radar systems. Generally, so as for Doppler processor to process the input data in real time, a parallel processing concept using multiple DSPs should be used. This paper implements a programmable Doppler processor, which consists of MTI filter, DFB and square-law detector, using 8 ADSP21060s. Formulating the distribution time of the input data, the transfer time of the output data and the time required to compute each algorithm, it estimates total processing time and the number of required DSP. Finally, using the TSG that provides radar control pulses and simulated target signals, performances of the implemented Doppler processor are evaluated.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.4
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• pp.810-816
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• 2011

The existing underwater acoustic communications modem is developing based on commercial products, so it is possible on functionality and performance of underwater acoustic communications modem implementation. But the production of development system is required to single platform system implementation at the system's size and cost. So this paper designs and implements the signal processing module as an important role to single hardware platform production of underwater acoustic communication modem by using TigerSHARC DSP processor.