• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2009년도 춘계학술대회
• /
• pp.302-305
• /
• 2009

본 논문에서는 환자나 만성질환자가 공간적으로 구속을 받지 않고 자유롭게 이동이 가능한 상태에서 건강상태 모니터링이 가능한 셀룰러폰(Cellular telephone)에 기반한 통합형 생체신호 계측 및 생체정보 관리가 가능한 생체 관리 시스템을 설계하고자 하였다. 메디컬센서 인터페이스를 센서노드에 부착할 경우 개별적인 센서노드가 필요하기 때문에 생체 디바이스의 문제점을 해결하기 위해서 통합형 메디컬 센서노드 어플리케이션을 설계하였다. 셀룰러폰으로 ECG(Electrocardiogram), 혈압(Blood pressure), 혈당(Blood sugar)과 같은 생체신호를 모니터링해서 비정상적인 생체신호를 판별하며, 당일 측정한 생체신호를 셀룰러폰에 저장해 과거에 측정한 메디컬 기록들과 함께 차트로 리뷰 가능하다. 본 논문에서는 기존의 실시간 생체 모니터링 비해, 개발된 셀룰러폰 기반의 헬스케어용 관리시스템은 고/저혈압, 당료를 갖고 있는 만성질환자가 상시적으로 질병을 관리할 수 있으며, 또한 CDMA의 특성상 넓은 환경에서도 전송이 가능하무로서 무선센서네트워크를 이용하기 위해 CDMA 방식과 통합하였다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2006년도 하계종합학술대회
• /
• pp.859-860
• /
• 2006

We developed a cuffless and noninvasive measurement technique of blood pressure using tonometric pressure sensor. With observation that the maximum value of pulse pressure is not obtained at mean arterial pressure(MAP), we have figured out MAP based on the physiological characteristic including the elasticity of wrist tisse. Detecting only one part of the body and using only one device are quite advantageous over other BP measurement techniques. Our technique makes new way for the cuffless BP measurement.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2007년도 춘계종합학술대회
• /
• pp.678-681
• /
• 2007

본 연구에서는 오실로메크릭법에 의한 혈압측정을 위하여 비관혈적인 방법으로 보다 정확하게 혈압을 추정할 수 있는 시스템을 구현하였다. 구현된 혈압 측정 시스템은 압력 제어부, 신호 측정부 그리고 혈압 신호처리부, 무선센서네트워크부 등으로 구성하였다. 구현된 혈압측정 실험 시스템의 타당성을 검증하기 위하여 압력 측정부의 특성 평가 실험, 혈압 추정을 위한 특성비율 산출 실험, 오실로 메트릭법에 의한 혈압 추정 및 평가 실험을 수행하였다. 본 연구에서 구현된 혈압 측정 실험 시스템으로 성인남성 5명을 실험 대상군으로 선정하여 데이터를 계측하고 혈압을 추정하는 실험을 한 결과 오실로메트릭에 의한 혈압 추정 및 평가 실험에서 청진법과의 평균동맥압, 수축기 혈압, 그리고 이완기 혈압에서 최대 절대편차 비율이 각각 1.38 %, 1.63 그리고 2.97 % 이었고 최대 표준오차가 각각 5.00, 3.72, 그리고 4.34인 혈압 측정 시스템을 구현하였다.

• 센서학회지
• /
• 제16권1호
• /
• pp.44-51
• /
• 2007

A hybridized simulator for generating blood pressure waveform is proposed to study the remedy and/or evaluation of the conventional sphygmomanometer utilizing the oscillometric method which is widely applied. The blood pressure of a flowing fluid was controlled for the blood vessel's condition caused by a rhythmical and periodical contraction/relaxation because of the special excitatory and conductive system of the heart. In this study, a hybridized controller composed of the PI feedback controller and the feedforward controller. The inverse dynamics function is proposed to operating the control valve while the pressure is applied in an oil pressure tank. The proposed hybrid simulator reproducing the blood pressure waveform in an artificial blood vessel has kept the control performance consistent over all range. Based on these results, the proposed simulators could be applied to the development and compensation of the non invasive sphygmomanometer type as well as to study the characteristics of the blood pressure and blood vessel.

• Journal of Biosystems Engineering
• /
• 제33권6호
• /
• pp.438-445
• /
• 2008

The purpose of this study was to develop a measurement model based on PLS (Partial least square) method for blood pressures. Measurement system for blood pressure signals consisted of pressure sensor, va interface and embedded module. A mercury sphygmomanometer was connected with the measurement system through 3-way stopcock and used as reference of blood pressures. The blood pressure signals of 20 subjects were measured and tests were repeated 5 times per each subject. Total of 100 data were divided into a calibration set and a prediction set. The PLS models were developed to determine the systolic and the diastolic blood pressures. The PLS models were evaluated by the standard methods of the British Hypertension Society (BHS) protocol and the American Association for the Advancement of Medical Instrumentation (AAMI). The results of the PLS models were compared with those of MAA (maximum amplitude algorithm). The measured blood pressures with PLS method were highly correlated to those with a mercury sphygmomanometer in the systolic ($R^2=0.85$) and the diastolic blood pressure ($R^2=0.84$). The results showed that the PLS models were the effective tools for blood pressure measurements with high accuracy, and satisfied the standards of the BHS protocol and the AAMI.

• 한국산업정보학회논문지
• /
• 제14권5호
• /
• pp.149-154
• /
• 2009

사람들의 평균 수명이 늘어남으로써 건강에 대한 관심도가 매우 높아지고 있다. 그에 따라 사람들은 자신의 몸 상태를 체크하며 주기적으로 자신의 건강상태를 확인하기 위해 정기검진을 받는다. 그러나 평소 자신의 맥박이나 혈압의 체크를 통하여 건강관리 및 질병예방이 가능하다. 따라서 본 논문에서는 간편하게 얻을 수 있으면서도 기본적이고 유용한 정보를 많이 가지고 있는 맥박신호를 혈액량에 따라 투과율의 변화를 측정할 수 있는 광센서를 이용한 방법과 압전 센서를 사용하여 손목의 요골동맥의 압력을 측정하여 맥박을 측정할 수 있는 휴대용 맥박측정 시스템을 구현하였으며 두 방법으로 제작된 시스템을 비교연구 하였다.

• 센서학회지
• /
• 제20권5호
• /
• pp.343-350
• /
• 2011

The compliance and stiffness of artery are closely related with disease of arteries. Pulse wave velocity(PWV) in the blood vessel is a basic and common parameter in the hemodynamics of blood pressure and blood flow wave traveling in arteries because the PWV is affected directly by the conditions of blood vessels. However, there is no standardized method to measure the PWV and it is difficult to measure. The conventional PWV measurement has being done by manual calculation of the pulse wave transmission time between coronary arterial proximal and distal points on a strip chart on which the pulse wave and ECG signal are recorded. In this study, a pressure sensor consisting of strain gauges is used to measure the blood pressure of arteries in invasive method and regular ECG electrodes are used to record the ECG signal. The R-peak point of ECG is extracted by using a reference level and time windowing technique and the ascending starting point of blood pressure is determined by using differentiation of the blood pressure signal and time windowing technique. The algorithm proposed in this study, which can measure PWV automatically, shows robust and good results in the extraction of feature points and calculation of PWV.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2005년도 추계종합학술대회
• /
• pp.489-492
• /
• 2005

Even though the blood pressure is one of the most widely used index for the healthcare monitoring of hypertensive and normotensive persons, there is no non-intrusive measurement method which is commercialized until now. Pulse Arrival Time (PAT) is known that it has close relation with the systolic blood pressure (SBP) and arterial stiffness. In this study, SBP estimation methods by non-intrusive measurement of PAT are suggested. For the unconstrained measurement of PAT, the first method used the electrically non contact electrocardiogram (ENC-ECG) technique and the reflective type of Photoplethysmography (PPG) sensor on the computer mouse. In the second method, ENC-ECG and the air pressure sensor in the seat cushion on a chair were measured. The third method used ECG electrodes and PPG sensors on the toilet seat cover. The validation and regression analysis of the relationship of PAT and SBP are summarized. These methods have considerable errors to be used for all people. But these can be applied for each subject after the parameter customization within acceptable error. So, it is feasible for suggested methods to be used for monitoring of SBP in daily life in non-intrusive way when there is personal identification system of each subject.

• 로봇학회논문지
• /
• 제19권2호
• /
• pp.221-228
• /
• 2024

As the importance of cardiovascular health is highlighted, research on its correlation with blood pressure, the most important indicator, is being actively conducted. Therefore, extensive clinical data is essential, but the measurement of the central arterial blood pressure waveform must be performed invasively within the artery, so the quantity and quality are limited. This study suggested a mock circulatory robot and artificial aorta to reproduce the blood pressure waveform generated by the overlap of forward and reflected waves. The artificial aorta was fabricated with biomimetic silicone to mimic the physiological structure and vascular stiffness of the human. A pressurizing chamber was implemented to prevent distortion of the blood pressure waveform due to the strain-softening of biomimetic silicone. The reproduced central arterial blood pressure waveforms have similar magnitude, shape, and propagation characteristics to humans. In addition, changes in blood pressure waveform due to aging were also reproduced by replacing an artificial aorta with various stiffness. It can be expanded to construct a biosignal database and health sensor testing platform, a core technology for cardiovascular health-related research.

• 센서학회지
• /
• 제25권2호
• /
• pp.138-142
• /
• 2016

A pulse measurement by tonometry provides useful information for diagnosis, including not only blood pressure and heart rate but also parameters for estimating a condition of the cardiovascular system. Currently, various pulse measurement devices based on the tonometry have been developed. A reliability of these devices is determined by a positioning technic between the sensor and the blood vessel and a controlling technique of the pressurization level. An angle of the sensor for the pulse measurement seems to be highly related with a measured signal, however, the objective studies for this issue have been not published. In this paper, the variation of the pulse signals by tonometry direction was experimentally assessed according to the angle of the sensor. In order for guaranteeing the repeatability of the experiment, we used a pulse generator device, which can generate human pulse signal by using silicon tube and fluid pump, and developed a structure for precise adjustment of the angle and the pressurization level of the sensor. The angle of the sensor was acquired by an inclinometer, which was attached at the opposite side of the sensor. As results, a coefficient of variation (CV) of a maximum amplitude (MA) of the pulse wave was largely increased over the angle range of $-9{\sim}9^{\circ}$. Furthermore, the changes of the pulse shape showed different aspects according to the sign of the angle tilted along the blood vessel. It is expected that the results of this study can be helpful for developing more precise pulse measurement devices based on the tonometry and applying in clinic.