• Journal of Sensor Science and Technology
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• v.11 no.4
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• pp.230-238
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• 2002

In this paper, we designed a fuzzy system using the wavelet coefficients to detection the PVCs effectively and to increase the accuracy of decision of the arrhythmia. In the proposed Fuzzy system, the QRS complex of ECG signal is divided into 6th level frequence bands by wavelet transform using Haar wavelet. The MIT/BIH database for the source of input signal is used in order to evaluate the performance of the proposed system. From the simulation results, the decision of membership functions for PVCs and heart rates by using Fuzzy rules, we detected the abnormal values effectively by application of leaned from neural network and we also found results in classification ratio of 95% the decision of arrhythmia.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.10
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• pp.2265-2271
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• 2011

This paper presents an u-health Care system based on context-awareness information. Extended project induced an education for creative engineering design. It could occur one of the issue for life care or wellness in recently life. Especially u-health Care system help on achieving this object as an efficient care-training with user blood pressure or with echocardiogram, electromyogram, electroencephalogram, or Electrocardiography. In this paper, development project show an u-health care system based on this parameters of the context-awareness with network service and analysis provide with working memory(DB) for user data base applications.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.6
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• pp.261-268
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• 2014

This paper presents a electrocardiogram(ECG), electromyogram(EMG), and Photoplethysmography(PPG) signal wireless monitoring system based on Bluetooth Low Energy (BLE). ECG and EMG sensor interface analog front-end circuits are designed by using off-the-shelf parts. Texas Instruments(TI)'s CC2540DK is used for BLE-based communication. Two CC2540DK modules are used as Peripheral and Central nodes. In peripheral device, vital signals are acquired by the analog front-ends and fed to ADC for analog-to-digital conversion. The peripheral transmitts the data through the air to the central device. The central device receive the data and sends them to PC using UART. GUI is designed using Labview for displaying the acquired vital signals. The developed system can be used for future ubiquitous wireless healthcare system based on bluetooth 4.0.

• Journal of the Korean Magnetics Society
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• v.23 no.4
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• pp.135-143
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• 2013

The clip-type pulsimeter equipped with a Hall sensor has a permanent magnet attached in the "Chwan" position to the center of a radial artery. The clip-type pulsimeter is composed of a hardware system measuring voltage signals. These electrical bio-signals display pulse rate, non-invasive blood pressure, respiratory rate, pulse wave velocity (PWV), and spatial pulse wave velocity (SPWV) simultaneously measured by using the radial artery pulsimeter, the electrocardiograph (ECG), and the photoplethysmograph (PPG). The findings of this research may be useful for developing a oriental-western biomedical signal storage device, that is, the new and fusion patient monitor, for a U-health-care system.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.826-828
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• 2007

건강과 복지에 대한 사람들의 관심이 증대함에 따라 고령층 인구를 중심으로 병원에서 건강 점검 및 진료가 이루어졌던 기존의 Health산업 패러다임에서 연령층에 관계없이 언제, 어디서나 진료를 받을 수 있는 u-Health산업 패러다임으로 변화하고 있다. 이러한 흐름에 발맞추어 유비쿼터스 컴퓨팅 환경에서 혈압, 맥박, 심전도 등과 같은 의료정보뿐만 아니라 일상생활에서 획득한 정보를 통해 건강증진, 질병예방, 진료를 가능하게 하는 u-LifeCare 의료체계가 필요하다. u-LifeCare 를 지원하는 미들웨어는 유비쿼터스 환경에서 필수적인 기술 요소인 센서 네트워크 미들웨어와 상황인지 미들웨어를 통합하는 미들웨어이며, 라이프케어의 특성을 고려한 '초경량(LightWeight)의, 확장성(Scalability)있는, 보안성(Security)을 갖춘' 미들웨어이다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.124-126
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• 2004

본 논문에서는 유비쿼터스 헬스케어 시스템을 위한 센싱 단말기 구현 내용을 설명한다. 본 연구에서 설계한 유비쿼터스 헬스케어 시스템은 센싱 단말기, 처리 단말기, DB 서버, 전문가 서버로 구성된다. 센싱 단말기는 사용자의 생체 신호를 검출하고 처리한 후 그 결과를 무선 통신을 통해 처리 단말기로 전달한다. 본 연구에서 구현한 센싱 단말기는 8MHz로 동작하는 AVR MicroController 처리기와 맥박 센서, 그리고 Bluetooth 무선 통신 모듈로 구성되어 있다. 또한 5개의 포트별로 8개의 입력 라인이 있어 다중 센싱 (Multi-Modal Sensing)이 가능하며, Bluetooth를 지원하는 다양한 처리 단말기와 연동이 가능하다는 특징을 갖는다. 실험결과 사용자의 생체 신호를 제대로 검출하여 무선 통신으로 전달함을 알 수 있었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.455-457
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• 2011

PIN type의 LED(${\lambda}=630nm$)와 photo TR을 이용하여 PPG 센서를 제작하였다. 이 때, LED의 광출력은 window 통과 후, 약 $240{\mu}W$이다. 그리고 인체에서 흡수 및 반사가 이루어진 후의 광파워는 더욱 작기 때문에 이를 보완하기 위해 photo TR을 LED 양측으로 배치하여 주변으로 반사하는 광을 측정하였다. 측정 된 신호는 filter와 OP amp.를 이용하여 1차 처리과정을 거치고, 알고리즘을 이용하여 2차 처리 하였다. 또한 알고리즘은 평상시를 포함하여 운동시에도 측정이 가능하도록 설계하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.348-351
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• 2014

비만이 사회적 문제로 대두되면서 운동에 대한 관심이 크게 증가하고 있다. 스마트 기기를 활용한 효과적인 운동 모니터링 및 관리를 위한 애플리케이션이 많이 개발되고 있다. 이러한 애플리케이션들은 운동 모니터링 및 운동 효과에 따른 칼로리 소모량 산출 기능을 제공하고 있으나, 운동시 실내와 실외를 구분하지 않는다. 그러나 실내와 실외 운동에 따른 칼로리 소모량은 다르게 산출되므로, 그 정확도가 떨어진다. 논문에서는 실내와 실외 운동으로 구분하고, 또한 Polar H7의 맥박 센서를 스마트폰에 연동하여 운동효과에 따른 칼로리 소모량을 정확하게 산출하여 보여주는 운동 모니터링 애플리케이션을 개발한다.

• Journal of the korean academy of Pediatric Dentistry
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• v.43 no.2
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• pp.158-165
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• 2016

The purpose of this study was to analyze photoplethysmographic waveforms from pulse oximeter using raw data of red and infrared light and investigate the reference values of parameters (Height, Width50, Maximum slope, Minimum slope, Area) for evaluating pulpal blood flow in maxillary central incisors with normal pulp vitality in children. The study was performed in 30 pediatric patients, aged 7-16 years old, using pulse oximeter (MEKICS Co., Ltd, Korea) combined with a custom-made sensor. The raw data was obtained and recorded by custom-made software and analyzed by LabChart (v.7.3, ADInstruments, Germany) offline. In this study, we analyzed photoplethysmographic waveforms from pulse oximeter applied to maxillary central incisor for assessment of pulpal blood flow and suggested several reference values of young permanent maxillary central incisor with normal pulp. On average, the waveform of red light was higher, stiffer and wider than that of infrared light. Future studies about reference values for other normal teeth and the teeth with impaired pulp vitality are needed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.2
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• pp.145-151
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• 2012

The pulsimeter is a representative device in the oriental medicine, which can analysis a risk factor in a cardiovascular diseases. However, most of the previous methods have the limit by the contacted sate of the brachial pulse and sensor in the measuring time, the inaccuracy of detected pulse, and the difficulty of pulse analysis. Accordingly, we propose the moving pulse image analysis based pulsimeter that can acquire a pulse of patient in real time by analyzing a moving image. then this video is shot the state change of the T.S. occurred by a pulse in capillary. In order to evaluate the performance of the our pulsimeter, we measured a respective detecting-rate about the essential 5 feature-points in the pulse analysis from the detected original pulse. As a result, the proposed method is very successful.