• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.11
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• pp.2057-2061
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• 2008

Individual heartbeat has specific character by a condition of heart, structure, age, and so forth. On this paper, We propose that individual verification method using specific character of heartbeat. This character are obtained by measure PPG(Photo Plethysmogram) using LD and PD.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.119-122
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• 2008

Individual heartbeat has specific character by a condition of heart, structure, age, and so forth. On this paper, We propose that individual verification method using specific character of heartbeat. This character are obtained by measure PPG(Photo Plethysmogram) using LD and PD.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.438-440
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• 2009

사람의 심박동은 심장 상태와 구조, 나이 등의 여러 요소에 의하여 고유한 특성을 갖고, 이러한 특성을 이용하여 개인 인증에 심박동을 적용할 수 있다. 본 논문에서는 기존의 심전도(ECG, electrocardiogram) 방법을 대신하여 빛을 이용한 광전용적맥파(PPG, Photo Plethysmogram)를 측정, 신호를 분석하였다.

• Journal of the Korean Institute of Telematics and Electronics
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• v.15 no.1
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• pp.1-4
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• 1978

This paper described the establishment of the basic data for the design of the transducer for the detection of plethysmogram, the structure of pulsimeter utilizing the designed transducer and the clinical usefulness of detected waveform of the optical detection method can be utilized as an information of cardiovascular system as physiological theoretical waveform of aorta, and derivative of plethysmogram by piezo electric elements clearly shows the information of incisura which does not appear at the old age and this makes the measuring of ejection time to be easy. The ejection time of average for 42 persons shows 0.324 $\pm$ 0.027 sec. and this value is in good agreement with the theoretical value, and the possibility of measuring the velocity of pulse conduction has been studied.

• The Journal of Korean Medicine
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• v.24 no.4
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• pp.136-138
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• 2003

Purpose : A clinical case of diabetic foot-wound repair using Hirudo medicinalis therapy and its application is reported and discussed. Methods : The subject was a sixty-six-year-old woman diagnosed with a non-healing wound indicating the amputation of her right diabetic foot. Instead, Hirudo medicinalis therapy was performed twelve times over forty days, twice a week. The transition of wound closure was observed with the naked eye, and the plethysmogram was measured at the beginning and end of the treatment period. Results : The wound contracted with decreased exudate, collagen-like connective tissue sprouted, and then the wound gradually closed. The initial value (-0.08) of the dicrotic elastic index rose to -0.03. Conclusion : Hirudo medicinalis therapy had a positive effect on the wound repair, without a negative effect on the circulation, allowing the foot to be saved. It is necessary to investigate its wound repair mechanism for the further development of the Sahyul method.

• Proceedings of the IEEK Conference
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• 2002.06e
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• pp.253-256
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• 2002

In this paper, we implement the volume pulse detection system which can quantitatively represent an artery elasticity. The system consists of transducer which has IRLED-photodiode detecter, temperature sensor, filters, preprocessing circuits, A/D converter, serial communication part and computer system. In order to presume the artery elasticity information we measure the volume pulse at four points and then evaluate the transition time, distance and the correlation coefficient of the pulse wave between the points. We test the system with 10 subjects during the week for basic experiment and obtain the data at four points. As the result of experiment, we can detect normalized volume pulse wave and evaluated parameter with effectively.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.2
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• pp.14-25
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• 2001

• 대한예방의학회:학술대회논문집
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• 1995.10a
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• pp.277-278
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• 1995

• Journal of Sensor Science and Technology
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• v.22 no.1
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• pp.76-83
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• 2013

A real-time wireless monitoring and analysis methods using the wearable PPG sensor to estimate cardiovascular condition is studied for ubiquitous healthcare service. A small size and low-power consuming wearable photoplethysmogram (PPG) sensor is designed as a wrist type device and connected with the IP node assigned its own IPv6 address. The measured PPG waveform in the IP node is collected and transferred to a central server PC through the IP-enabled wireless network for storage and analysis purposes. A monitoring and analysis program is designed to process the accelerated plethysmogram (APG) waveform by applying the second order derivatives to analyze systolic waves as well as heart rate variability analysis from the measured PPG waveform. From our results, the features of cardiovascular condition from individual's PPG waveform and estimation of vascular compliance by the comparison of APG-aging index (AI) and ratio of LF/HF are demonstrated.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.4
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• pp.813-820
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• 2009

This paper describes the realization of ubiquitous healthcare monitoring system using wearable pulse oximeter based on a wireless sensor network. In order to obtain information of oxygen saturation from a patient, a small size and low power consumption wearable pulse oximeter was designed. Information of oxygen saturation collected by wireless sensor node was transmitted wirelessly to a base-station for storage and display purposes via wireless sensor network. Wireless sensor nodes were programmed by TinyOS application to perform data acquisition and transmission. Lab VIEW server program was designed to monitor information of oxygen saturation and process the measured PPG (photo plethysmogram) signals to APG(Accelerated plethysmogram) signals by appling second order derivatives. PPG signals are simple and cost effective technique to measure blood volume change.