• Science of Emotion and Sensibility
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• v.26 no.3
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• pp.149-160
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• 2023

This study develops a time-varying system-based noncontact fabric sensor that can measure cerebral blood-flow signals to explore the possibility of brain blood-signal detection and emotional evaluation. The textile sensor was implemented as a coil-type sensor by combining 30 silver threads of 40 deniers and then embroidering it with the computer machine. For the cerebral blood-flow measurement experiment, subjects were asked to attach a coil-type sensor to the carotid artery area, wear an electrocardiogram (ECG) electrode and a respiration (RSP) measurement belt. In addition, Doppler ultrasonography was performed using an ultrasonic diagnostic device to measure the speed of blood flow. The subject was asked to wear Meta Quest 2, measure the blood-flow change signal when viewing the manipulated image visual stimulus, and fill out an emotional-evaluation questionnaire. The measurement results show that the textile-sensor-measured signal also changes with a change in the blood-flow rate signal measured using the Doppler ultrasonography. These findings verify that the cerebral blood-flow signal can be measured using a coil-type textile sensor. In addition, the HRV extracted from ECG and PLL signals (textile sensor signals) are calculated and compared for emotional evaluation. The comparison results show that for the change in the ratio because of the activation of the sympathetic and parasympathetic nervous systems due to visual stimulation, the values calculated using the textile sensor and ECG signals tend to be similar. In conclusion, a the proposed time-varying system-based coil-type textile sensor can be used to study changes in the cerebral blood flow and monitor emotions.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.603-606
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• 2008

본 연구에서는 가정 또는 사무실에서 무구속(non-restrained)적인 방법으로 심장의 활동상태를 모니터링하기 위하여 심탄도(ballistocardiogram, BCG)를 계측하고자 하였다. 심탄도는 심전도의 측정과는 다르게 신체에 전극을 부착할 필요가 없고, 무구속 상태에서 신호계측이 가능하므로 장시간 동안 심장상태의 모니터 링에 유용하게 활용할 수 있는 장점이 있다. 따라서 본 연구에서는 무구속 심탄도 계측을 위하여 의자형 심탄도 측정시스템을 구현하였다. 먼저 로드셀을 의자의 상판과 하판사이에 설치하여 피검자의 체중을 측정할 수 있는 센서부를 구성하였으며, 센서로부터 출력되는 신호를 증폭 및 필터링하기 위한 계측부를 구현하였다. 구현된 심란도 계측시스템의 성능평가를 위하여 피검자 10명을 대상으로 심란도 계측평가를 수행하였으며, 이때 심전도 신호와 동시계측을 수행하였다. 평가결과 본 연구에 의해 구현된 심탄도 계측시스템의 우수한 계측성능을 확인할 수 있었다.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.11
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• pp.188-192
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• 1997

The purpose of this study are changing wired medical instrument's terminal into wireless and implementing BSS of Wireless Local Area Network. the wireless terminal using frequency hopping spread spectrum in ISM band transfers patients medical information data such as ECG data, Patient Disease Indication Message to AP(or Server) and it also performs that as a response of transmission request in server. we made Clinet-Server network structure support only BSS service and patient's terminal controlled by polling in server. Wireless Terminal will guarantee mobility and give doctors real time monitoring capability in office.

• Journal of Biomedical Engineering Research
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• v.27 no.1
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• pp.14-21
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• 2006

As information technologies are developing, the improvement of the quality of life becomes worldwide issues. Especially, to improve the quality of life of a patient suffering intermittent diseases, in addition to the some portable equipments for measuring, analyzing, and notifying the status of the patients, methods of communication for seamless transmission of the measured data over to the remote site, such as an emergency center or a hospital, are required. In this paper, we address a seamless transmission of patient monitoring data such as ECG from a moving patient to a remote site, wherever the patient may be. We divide the whole environments into two wireless communication environments: an indoor one based on WLAN and an outdoor one based on CDMA cellular network in which the patient is assumed to move anywhere. We develop algorithms, implement them on a PDA-based hardware platform, and show some of the results for handover between the two environments in addition to the data transmission for each of the two environments.

• Journal of electromagnetic engineering and science
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• v.3 no.1
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• pp.45-49
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• 2003

Wireless life signal detecting system is implemented with using the mechanism of Doppler Effect. This system can measure the respiration and heart rates with the periodic movement of skin and muscle near the heart. The system is consisted of antenna, RF transmitter, receiver, and display part. We did use two operating frequencies at 1.9 ㎓ and 10 ㎓. Firstly, the link budget about detecting system is analyzed and the signal detected from the system is compared with electrocardiogram(ECG) of monitor which is using for patient monitoring in hospital. Secondly, the detection of vital sign is also performed according to the different distances, and including behind the wall.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.534-535
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• 2017

With the economic growth, the quality of life of the individual is improving and interest in health is increasing. However, it is not easy for self-care for the modern people who are busy and the elderly who are uncomfortable. The purpose of this study was to develop a healthcare system that can more easily monitor the health condition of the patients. The ECG and pulse wave including the important health information that can be conveniently measured by the general public can be measured and the PTT and to monitor the health status of the circulatory system. To evaluate the performance of the implemented system, we measured PTT according to posture change and evaluated the possibility of monitoring arterial blood flow during daily life.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.662-665
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• 2008

본 연구에서는 기존 병원중심의 생체신호모니터링을 가정 내에서 보다 편리하게 수행하여 일상생활중 지속적인 건강상태를 모니터링하고 계측된 생체신호를 웹을 통해 병원이나 전문가가 실시간으로 모니터링 할 수 있는 생체신호 모니터링 시스템을 구현하였다. 구현한 시스템은 범용적인 건강모니터링에 활용할 수 있는 생체신호인 심전도, 맥파를 측정대상으로 하였다. 심전도와 맥파의 계측을 위하여 신호 측정부를 구성하였고, 신호측정부로부터 검출된 신호를 PC기반의 신호모니터링 프로그램으로 전송하기 위하여 마이크로프로세서를 이용한 신호변환 및 시스템 제어부를 구성하였다. 계측된 데이터는 시스템 자체에서 그래픽 LCD를 이용하여 디스플레이가 가능하도록 구성하였으며, 블루투스 통신을 통해 PC와의 무선통신이 가능하도록 시스템을 구성하였다. 또한 PC기반의 실시간 모니터링 프로그램을 구현하여 데이터의 디스플레이 및 저장이 가능하도록 하였으며, 더 나아가 원격지에서의 신호모니터링이 가능하도록 시스템을 구현하였다.

• Journal of Electrical Engineering and Technology
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• v.10 no.1
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• pp.364-371
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• 2015

In this study, we developed a feasible structure of a textile-based inductive sensor using a machine embroidery method, and applied it to a non-contact type vital sign sensing device based on the principle of magnetic-induced conductivity. The mechanical heart activity signals acquired through the inductive sensor embroidered with conductive textile on fabric were compared with the Lead II ECG signals and with respiration signals, which were simultaneously measured in every case with five subjects. The analysis result showed that the locations of the R-peak in the ECG signal were highly associated with sharp peaks in the signals obtained through the textile-based inductive sensor (r=0.9681). Based on the results, we determined the feasibility of the developed textile-based inductive sensor as a measurement device for the heart rate and respiration characteristics.

• Proceedings of the IEEK Conference
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• 2002.06e
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• pp.129-132
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• 2002

In this paper, we describe a millimeter-wave radiation system developed for stimulating acupuncture points, and an analyzing system developed for monitoring the change of physiological signals after the stimulation such as ECG, skin temperature, skin potential and skin resistance. The systems are to be used to investigate the treatment efficacy and biological effects of the millimeter-wave, and eventually, can be used to study the acupuncture meridian system theory in the traditional Korean medicine.

• Journal of Korea Multimedia Society
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• v.22 no.2
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• pp.242-249
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• 2019

Old people and patients with cardiovascular disease could die of a heart attack in the bath with heated water for a long time. Various researches have been studied to prevent these accidents from happening such as measuring the ECG signal when taking bath. However, these devices are hard to use and the higher price is not easily accepted by the public. In this paper, a low-cost and use-friendly, real time high precision water temperature monitoring device to prevent heart attack in the bath was developed. The device with waterproof design that lets the device can float on the surface of the water, and an accurate way to make water temperature measurement method was proposed by this paper that is immerging the sensor into water with 4cm depth to measure the temperature of underwater. The manufactured device was conducted to two experiments; one was to verify the basic functions of the device, and another one was for compare the proposed device with commercial products for monitoring the water temperature in the bathtub. As the experimental results shown, the proposed device has stable performance for the water temperature measurement and communicating with laptop in wireless.