• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.4 no.1
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• pp.17-22
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• 2011

In this study, a P wave emphasizing and detection algorithm from ECG signal was proposed to read arrhythmia. The algorithm uses two slope tracing waveform, the descending slope tracing wave and the ascending slope tracing wave, developed for efficient determination of slope inverting points and sudden slope changing points. The algorithm generates the slope tracing waveform which trace the original ECG wave, and subtracts one tracing wave from the other to detect P and T waves. The algorithm has been applied to MIT/BIH database in order to verify its efficacy and validity in practical applications.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.07a
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• pp.355-356
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• 2013

심장의 활동을 전기적 변위로 표현되는 심전도 신호는 심장병 진단에 중요한 임상적 파라미터들을 제공한다. 특히 심전도 신호에서 P, QRS Complex,, T 특징점들로 대표되는 파형 변곡점들의 시간상 위치와 크기 및 형태학적 모양은 심장의 이상 리듬을 나타내는 부정맥여부를 검출하는데 핵심적인 역할을 한다. 본 연구에서는 특히 QRS complex 구간에 대한 첨도치의 연산 해석을 통하여 정상적인 심전도 리듬과 심실조기수축 부정맥 리듬을 구분하는 방법을 제시하고 또한 스마트폰을 기반으로 하는 심전도 모니터링 시스템에 적용하고자 하였다.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.38 no.6
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• pp.65-75
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• 2001

We proposed the detection method of pH variations by integrating a photocurrent characteristic curve, instead of finding an inflection point by differentiating it in LAPS system. By a simulation of the performance of the proposed method, we verified that it had 80 and 1000 times higher sensitivity and resolution than a conventional method. Then, with the implemented system based on the simulation results, we measured a pH variation which was given rise to a potential change on the LAPS surface exposed to 2-0.03125[mg/ml] enzyme solutions. As results, we observed that the proposed method has a higher sensitivity and resolution of 3.76-0.08[pH/min] pH variations than 3.79-0.27[pH/min] for conventional method with same samples.