• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.43-45
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• 2007

We developed a portable urodynamics monitoring system using personal digital assistance (PDA) and proposed a new method for measuring the abdominal pressure in non invasive mode using surface EMG signals. This system is consisted of a signal conditioning and control module and could measure the vesical, abdominal and detrusor pressure. The result showed a high correlation coefficient between the practical abdominal pressure, using a conventional rectal catheter and the estimated values, by our proposed algorithm (r=0.81). This system should prove a useful tool in the future evaluations of ambulatory urodynamics monitoring study.

• Physical Therapy Rehabilitation Science
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• 제11권1호
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• pp.49-57
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• 2022

Objective: This study aims to conduct a comprehensive review of monitoring systems to monitor and manage physical function of community-dwelling elderly living alone and suggest future directions of unobtrusive monitoring. Design: Literature review Methods: The importance of health-related monitoring has been emphasized due to the aging population and novel corona virus (COVID-19) outbreak.As the population gets old and because of changes in culture, the number of single-person households among the elderly is expected to continue to increase. Elders are staying home longer and their physical function may decline rapidly,which can be a disturbing factorto successful aging.Therefore, systematic elderly management must be considered. Results: Frequently used technologies to monitor elders at home included red, green, blue (RGB) camera, accelerometer, passive infrared (PIR) sensor, wearable devices, and depth camera. Of them all, considering privacy concerns and easy-to-use features for elders, depth camera possibly can be a technology to be adapted at homes to unobtrusively monitor physical function of elderly living alone.The depth camera has been used to evaluate physical functions during rehabilitation and proven its efficiency. Conclusions: Therefore, physical monitoring system that is unobtrusive should be studied and developed in the future to monitor physical function of community-dwelling elderly living alone for the aging population.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1986년도 하계학술대회논문집
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• pp.192-197
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• 1986

The device that we are developing is a microprocessor-based, portable arrhythmia monitor that ultimately will need processing algorithm similar to those found now in monitoring systems in the cardiac care unit of today's hospital. Our initial goal is to replace the functions of the Holter tape recorder, the current device of choice for determining if an ambulatory patient has potential heart disease.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.834-837
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• 2005

In this paper, we describe the method of non-invasive blood pressure measurement using pulse wave transit time(PWTT). PWTT is a new parameter involved with a vascular that can indicate the change of BP. PWTT is measured by continuous monitoring of ECG and pulse wave. No additional sensors or modules are required. In many cases, the change of PWTT correlates with the change of BP. We measure pulse wave using the photo plethysmograph(PPG) sensor in an earlobe and we measure ECG using the ECG monitoring device our made in the chest. The measurement device for detecting pulse wave consists of infrared LED for transmitted light illumination, pin photodiode as light detector, amplifier and filter. We composed 0.5Hz high pass, 60Hz notch and 10Hz low pass filter. ECG measurement device consists of multiplexer, amplifier, filter, micro-controller and RF module. After amplification and filtering, ECG signal and pulse wave is fed through micro-controller. We performed the initial work towards the development of ambulatory BP monitoring system using PWTT. An earlobe is suitable place to measure PPG signal without the restraint in daily work. From the results, we can know that the dependence of PWTT on BP is almost linear and it is possible to monitoring an individual BP continuously after the individual calibration.

• 전자공학회논문지SC
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• 제45권6호
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• pp.132-140
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• 2008

복압 측정을 위한 기존의 카데터 방법은 배뇨압에 영향을 줄 수 있는 많은 오차를 유발할 수 있으며 환자에게 불편함을 야기한다. 이러한 문제점을 해결하기 위해, 본 연구에서는 표면 근전도를 이용하여 비침습적으로 복압을 측정할 수 있는 새로운 방법을 개발하였다. 연구 결과, 기존 직장 카테터를 이용하여 측정된 복압과 복압측정 알고리즘을 이용하여 추정된 복압 간의 상관계수는 $0.79{\pm}0.06$이었으며, 두 신호간의 오차는 $0.10{\pm}0.07$이었다. 본 연구에서 개발된 복압추정 알고리즘을 이용하면 휴대용 요역동학 검사 시 편리하게 간접적으로 복압을 측정할 수 있을 것으로 생각된다.

• Journal of Yeungnam Medical Science
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• 제6권1호
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• pp.99-107
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• 1989

저자들은 1987년 9월부터 1989년 4월사이 약 19개월간 영남대학병원 내과에 입원하여 만성 심방세동 진단하에 치료받고 있던 환자 34명을 대상으로 digoxin치료를 받은 20명과 치료를 받지 않은 10명에 대한 24시간 ambulatory ECG를 시행하여 두 집단간의 심박수의 변화 및 가장 긴 정지기등을 비교 분석한 결과 다음과 같은 성적을 얻었다. 1) 대상환자 34례의 평균 심박수의 평균치는 $75.7{\pm}13.8$회/min.($mean{\pm}S.D.$), 가장 빠른 심박수는 $148.0{\pm}32.4$/min.($mean{\pm}S.D.$), 가장 느린 심박수는 $48.1{\pm}8.4$회/min.($mean{\pm}S.D.$)이었고 가장 빠른 심박수와 가장 느린 심박수의 차이의 평균치는 $99.9{\pm}29.0$회/min.($mean{\pm}S.D.$), 가장 긴 정지기는 $2.95{\pm}1.06sec.$($mean{\pm}S.D.$)이었으며 이중 4명은 가장 긴 정지기가 4.0sec.이상으로 sick sinus syndrome을 배제할 수 없어서 비교대상집단에서는 제외시켰다. 2) 대상환자 34례중 27례에서 심실성 기외수축이 있었으며 100회/24hours이내가 11례(40.7%)로 가장 많았고, 변성전도(aberrant conduction)는 전례에서 다 나타났다. 3) Digoxin(0.25mg/day)으로 치료받은 20례의 평균 심박수의 평균치는 $78.4{\pm}13.7$회/min.($mean{\pm}S.D.$), 가장 빠른 심박수는 $152.5{\pm}33.1$회/min.($mean{\pm}S.D.$), 가장 느린 심박수는 $48.9{\pm}8.5$회/min.($mean{\pm}S.D.$) 이었고 가장 빠른 심박수와 가장 느린 심박수의 평균치는 $103.6{\pm}31.7$회/min.($mean{\pm}S.D.$), 가장 긴 정지기는 $2.55{\pm}0.50$sec.($mean{\pm}S.D.$)이었다. 4) Digoxin으로 치료받지 않은 10례의 평균 심박수의 평균치는 $78.0{\pm}10.7$회/min.($mean{\pm}S.D.$), 가장 빠른 심박수는 $154.5{\pm}26.8$회/min($mean{\pm}S.D.$), 가장 느린 심박수는 $50.6{\pm}7.1$회/min.($mean{\pm}S.D.$)이었고 가장 빠른 심박수와 가장 느린 심박수의 평균치는 $103.9{\pm}22.2$회/min.($mean{\pm}S.D.$), 가장 긴 정지기는 $2.66{\pm}0.39sec.$($mean{\pm}S.D.$)이었다. 5) Digoxin으로 치료받은 20명과 치료받지 않은 10명의 두 집단간의 평균 심박수, 가장 빠른 심박수, 가장 느린 심박수, 가장 빠른 심박수와 가장 느린 심박수의 차이, 가장 긴 정지기의 차이는 통계학적으로 유의하지 않았다(P>0.05). 이상을 요약하면 하루 0.25mg의 digoxin투여로 만성 심방세동 환자의 심박수는 잘 조절되었으며 만성 심방세동 환자의 치료유무 결정 및 치료약제에 대한 반응등을 평가하는데 ambulatory ECG가 유용하고 안전한 검사법으로 사료된다.

• 한국임상약학회지
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• 제5권2호
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• pp.17-31
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• 1995

Pharmacist-managed Anticoagulation Service(ACS) was estabilished and the effectiveness of warfarin monitoring by ACS in maintaining therapeutic INR was evaluated. The primary goal of ACS is to maximize the control of therapy, to maintain therapeutic INR and to decrease morbidity and hospitalization caused by inadequate dosage regimen. Clinical pharmacists performed chartreview, laboratory interpretation, recommendations for warfarin dosage adjustments, physician and patient education, and coordination of follow-up in ACS. Patients receiving warfarin sodium were evaluated via retrospective chart review. Sixty-two patients were referred to ACS by primary physicians were compared with 117 patients in the physician-amtrolled group. The ACS patients maintained $88.6\%$ in the therapeutic range for anticoagulant therapy and the control group maintained $63.7\%$, where the difference was statistically significant.(P<0.001) The ACS improved warfarin dose determination, PT stability, patient compliance and provided improved therapy compared with the control group. ACS offers safe and efficient anticoagulant therapy in the ambulatory setting.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.943-945
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• 2003

This study is to evaluate the change of intra-abdominal pressure related with intravesical and intrarectal pressure in patients with spinal cord injury according to daily activities and postural changes which make the abdominal pressure elevated. The intravesical and the intrarectal pressures were obtained during patient's speech, sneeze, cough, valsalva and various postural changes with supine to decubitus, derubitus to supine, supine to sit, and sit to supine according to empty and full bladders, respectively. The order of higher intravesical and intrarectal pressure rise during various maneuvers were valsalva, sneeze, supine to sit and cough, respectively. Higher correlation coefficient between the intrvesical and intrarectal pressures were noted during cough, sneeze, valsalva and supine to sit in empty bladder than full one. These results demonstrated that the intravesical and intrarectal pressures were influenced by daily activities and postural changes of increasing the intra-abdominal pressure. The intrarectal pressures according to daily activities such as cough, sneeze, valsalva and postural change were significantly related with intravesical pressures.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 추계종합학술대회 B
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• pp.265-269
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• 2008

Home health care with compact wearable units sounds to be a convenient solution for the elderly people living independently. This paper presents a method to detect fall from the other activities of daily living and also to classify those activities. This kind of ambulatory monitoring enables them to get an emergency help in the case of the fatal fall event and can provide their general health status by observing the activities being performed in daily life. A tri-axial accelerometer sensor is used to get the acceleration anomalies associated with the user's movements. The three axis acceleration data are transferred to the base station sensor node via an IEEE 802.15.4 compliant zigbee module. The base station sensor node sends the data to base station PC for an offline processing. This work shows the feature set preparation using the principal component analysis (PCA) for the designing of neural network. The work includes the most common activities of daily living (ADL) like Rest, Walk and Run along with the detection of fall events from ADL. The angle from the vertical is found to be the most significant feature parameter for classification of fall while mean, standard deviation and FFT coefficients were used as the feature parameter for classifying the other activities under consideration. The accuracy for detection of fall events is 86%. The overall accuracy for ADL and fall is 94%.

• 제어로봇시스템학회논문지
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• 제15권4호
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• pp.406-412
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• 2009

ECG is used on purpose to keep good health or monitor cardiac function of aged person as well as on purpose to diagnose the disease of heart patients. The ambulatory ECG monitoring system under guarantee of safety and accuracy is very efficient to prevent the progress of heart disease and sudden death. These systems can detect the temporary change of ECG that is very significant to diagnose heart disease such as myocardial ischemia, arrhyamia and cardiac infarction. In this paper, we describe the ECG signal analysis algorithm and measurement device for ECG monitoring. The authors designed a small-size portable ECG device that consisted of instrumentation amplifier, micro-controller, filter and RF module. The device measures ECG with four electrodes on the body and detects QRS complex and ST level change in realtime. Also it transmits the measured signals to the personal computer. The developed software for ECG analysis in personal computer has the function to detect the feature points and ST level changes.