• 한국IT서비스학회지
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• 제7권2호
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• pp.113-125
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• 2008

To test if the developed ubiquitous health care devices working well and vital information could be collected and monitored systematically through internet and to test if the devices and services could be used further. Kyungwon University, KT Co., Gil Medical Center, LIG Nex1 Co., and Sujeong Health Center conducted an ubiquitous health care demonstration project in Sujeong-Gu, Sungnam, Korea from Mar. 5 to May 16. We developed and applied several medical devices to monitor health of the elderly in their houses through internet. The devices were sphygmomanometer, glucometer, body fat scale, Health Pad, and activity sensor. We distributed the devices to 20 recipients of home care and 7 diabetes patients. After received the devices and were explained how to use them, they used the devices in their houses. The vital signs of the residents were monitored through internet. A nurse monitored and consulted their vital signs in the monitoring center in Kyungwon University during the demonstration period. The consultant called them and consulted on their blood pressure, blood sugar level, and body fat after a few seconds they used the devices as well as provision of recommended contents such as diets and activities through Health Pad. To investigate cognition and satisfaction of the participants for the devices, we surveyed the participants at the end of the demonstration period. For the change in blood pressure, blood sugar level, and activities, we conducted statistical test. After the demonstration period. cognition and satisfaction for the devices and change in blood pressure, blood sugar level, and activities were evaluated. Most of the participants were acknowledged how to use the device and satisfied with the use of the devices. The internet monitoring and services are considered to be promising because most of the participants were satisfied especially because somebody was monitoring their health status. However some weaknesses such as short battery life of the activity sensor, lack of connection of consultations with hospitals, and low understanding on usage of some of the devices need to be complemented.

• 대한의용생체공학회:의공학회지
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• 제31권5호
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• pp.395-400
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• 2010

Hypertension is the chronic disease that the 16% of total population are suffering, and it needs to be studied to find alternative treatment because of the tolerance and side effect of medications that may bother some patients. in this paper, we verified practicality of implantable electrical stimulator that can readily change stimulus magnitude and frequency. And this device is possible to stimulate baroreflex or parasympathetic nerve. Therefore we performed in vitro tests and animal experiment for device's operating conditions. This device consist of implantable electrical stimulator and extracorporeal control/monitoring system. Stimulator was designed to make 1Hz~100Hz pulses and it can change continuous or periodic pulse train type. And this device can control stimulator's function and monitor stimulator's status and patients' blood pressure at exterior of body using ZigBee module as wireless telecommunication. We verified that stimulator have error rate under 5% at 50mm depth of organs and, stimulator makes high-efficiency energy with closer position of two electrodes. Also we can confirm the performance of device that decreasing blood pressure and heart rate of a rat by electrical stimulation.

• Journal of Veterinary Science
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• 제23권6호
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• pp.68.1-68.8
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• 2022

Background: Studies on anesthetized dogs regarding pulse pressure variation (PPV) are increasing. The influence of respiratory rate (RR) on PPV, in mechanically ventilated dogs, has not been clearly identified. Objectives: This study evaluated the influence of RR on PPV in mechanically ventilated healthy dogs after hemorrhage. Methods: Five healthy adult Beagle dogs were premedicated with intravenous (IV) acepromazine (0.01 mg/kg). Anesthesia was induced with alfaxalone (3 mg/kg IV) and maintained with isoflurane in 100% oxygen. The right dorsal pedal artery was cannulated with a 22-gauge catheter for blood removal, and the left dorsal pedal artery was cannulated and connected to a transducer system for arterial blood pressure monitoring. The PPV was automatically calculated using a multi-parameter monitor and recorded. Hemorrhage was induced by withdrawing 30% of blood (24 mL/kg) over 30 min. Mechanical ventilation was provided with a tidal volume of 10 mL/kg and a 1:2 inspiration-to-expiration ratio at an initial RR of 15 breaths/min (baseline). Thereafter, RR was changed to 20, 30, and 40 breaths/min according to the casting lots, and the PPV was recorded at each RR. After data collection, the blood was transfused at a rate of 10 mL/kg/h, and the PPV was recorded at the baseline ventilator setting. Results: The data of PPV were analyzed using the Friedman test followed by the Wilcoxon signed-rank test (p < 0.05). Hemorrhage significantly increased PPV from 11% to 25% at 15 breaths/min. An increase in RR significantly decreased PPV from 25 (baseline) to 17%, 10%, and 10% at 20, 30, and 40 breaths/min, respectively (all p < 0.05). Conclusions: The PPV is a dynamic parameter that can predict a dog's hemorrhagic condition, but PPV can be decreased in dogs under high RR. Therefore, careful interpretation may be required when using the PPV parameter particularly in the dogs with hyperventilation.

• 디지털융복합연구
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• 제12권1호
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• pp.467-473
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• 2014

본 연구의 목적은 점진적 이완기법을 대학 양궁선수들에게 적용한 후 뇌파측정과 혈압, 심박수 등의 생리적인 변인의 측정을 통하여, 호흡을 통한 점진적 이완의 효과성을 검증하고 궁극적으로 양궁의 경기수행력을 향상시키는데 목적이 있다. 본 연구의 대상자들은 여자 양궁선수 13명을 대상자로 선정하였고, 12주간 Jacobson의 점진적 이완기법을 적용하여 1주일에 3일, 1회 약 15~20분 동안 훈련 후, 동일 대상자 13명의 뇌파와 혈압, 심박수를 측정하였다. 본 연구의 자료처리는 SPSS18.0프로그램을 이용하여 실험 대상자의 일반적인 특정을 알아보기 위하여 기술분석을 실시하였고 단일 집단의 뇌파, 혈압, 심박수의 사전 사후의 변화를 알아보기 위하여 대응 t-test(paired t-test)를 실시하였다. 모든 통계적 유의 수준은 ${\alpha}=0.5$로 하였고, 다음과 같은 결과를 얻었다. 첫째, 12주간 처치 후 상대 ${\alpha}$파, 상대 ${\beta}$ 중에서 상대${\alpha}$파가 통계적으로 유의한 수준으로 증가하였고, 상대 ${\beta}$파의 변화는 나타내지 않았다. 둘째, 12주간 처치 후 혈압의 변화로는 수축기압의 변화는 나타내지 않았고, 이완기 혈압의 변화가 통계적으로 유의한 수준으로 나타났다. 셋째, 심박수의 변화는 통계적으로 유의하게 나타나지 않았다. 이상의 결과를 종합하여 볼 때 호흡을 통한 점진적 이완기법은 대학 양궁선수들에게 긍정적인 영향을 미치는 것으로 나타났다.

• Clinical and Experimental Pediatrics
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• 제54권11호
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• pp.463-469
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• 2011

Purpose: To validate the Dinamap ProCare 200 blood pressure (BP) monitor against a mercury sphygmomanometer in children 7 to 18 years old in accordance with the 2010 International Protocol of European Society of Hypertension (ESH-IP2) and the British Hypertension Society (BHS) protocol. Methods: Forty-five children were recruited for the study. A validation procedure was performed following the protocol based on the ESH-IP2 and BHS protocols for children and adolescents. Each subject underwent 7 sequential BP measurements alternatively with a mercury sphygmomanometer and the test device by trained nurses. The results were analyzed according to the validation criteria of ESH-IP2. Results: The mean (${\pm}SD$) difference in the absolute BP values between test device and mercury sphygmomanometer readings was $1.85{\pm}1.65$ mmHg for systolic BP (SBP) and $4.41{\pm}3.53$ mmHg for diastolic BP (DBP). These results fulfilled the Association for the Advancement of Medical Instrumentation criterion of a mean${\pm}$SD below $5{\pm}8$ mmHg for both SBP and DBP. The percentages of test device-observer mercury sphygmomanometer BP differences within 5, 10, and 15 mmHg were 96%, 100%, and 100% for SBP, and 69%, 92%, and 100% for DBP, respectively, in the part 1 analysis; both SBP and DBP passed the part 1 criteria. In the part 2 analysis, SBP passed the criteria but DBP failed. Conclusion: Although the Dinamap ProCare 200 BP monitor failed an adapted ESH-IP2, SBP passed. When comparing BP readings measured by oscillometers and mercury sphygmomanometers, one has to consider the differences between them, particularly in DBP, because DBP can be underestimated.

• 한국지능시스템학회논문지
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• 제20권1호
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• pp.146-152
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• 2010

본 논문에서는 RFID를 이용하여 사용자를 인식한 후 사용자의 생체신호(혈압, 혈당, 체지방)를 측정하여 자가진단을 할 수 있는 지능형 헬스케어 시스템을 구현하였다. 구현한 헬스케어 자가진단 지능형 시스템은 RFID리더기, 생체신호측정기(혈압계, 혈당계, 체지방측정기), 데이터베이스 서버역할을 하는 컴퓨터, 자가진단 결과를 출력하는 프린터로 구성된 키오스크형태로 이루어졌으며 데이터베이스에서 보유한 사용자 정보 및 측정된 정보 데이터를 비교분석한 후 사용자의 건강상태를 자가진단할 수 있다. 구현된 시스템은 병원에 가지 않더라도 간단히 자가진단을 할 수 있으며, 회사나 학교 등에서 응용할 수 있다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.534-535
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• 2017

경제성장과 더불어 개인의 삶의 질이 향상되고 있으며, 이에 따라 건강관리에 대한 관심이 증가하고 있다. 그러나 바쁘게 살아가는 현대인들과 몸이 불편한 노인들의 경우에는 스스로 건강을 관리하기란 쉽지 않은 일이다. 본 연구에서는 자신의 건강상태를 보다 편리하게 모니터링 할 수 있는 헬스케어 시스템을 개발하고자 하였으며, 일반인이 편리하게 측정할 수 있으면서도 중요한 건강정보를 포함하는 심전도와 맥파를 계측하고 이로부터 맥파전달시간을 측정하여 혈액순환계의 건강상태를 모니터링 하고자 하였다. 구현된 시스템의 성능평가를 위해 자세변화에 따른 맥파전달시간을 측정하고 이로부터 일상생활 중 동맥혈관계 모니터링 가능성 평가하였다.

• 대한의용생체공학회:의공학회지
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• 제24권5호
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• pp.381-389
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• 2003

상완혈압과 두부혈압의 상승은 혈액순환장애와 함께 각종 성인병과 난치성질환인 뇌졸중과 치매, 중풍의 원인이 되고 있다. 뇌졸중이나 중풍의 조기진단에 있어서, MRI 같은 의료장비는 발병전 진단보다는 발병후의 치료를 위한 목적으로 이용되고 있으며 의료비 부담이 큰 단점이 있다. 또한, 상완혈압이 정상인 사람에서도 중풍이 발생하고 있어서, 상완혈압에 의한 진단보다는 뇌혈류상태를 반영하는 두부혈압을 진단하는 것이 더 정확한 임상진단을 할 수 있다. 그러나 기존 혈압계로는 두부혈압을 측정할 수 없다. 본 논문에서는 상완혈압과 두부혈압을 쉽고 간편하게 측정하고, 상완혈압에 대한 두부 혈압의 상관성을 추출하여 뇌혈류 상태 및 건강상태를 조기 진단/예방할 수 있는 시스템 및 알고리즘을 개발하였다. 시스템의 임상실험 결과, 두부혈압의 최고압은 상완 최고압의 62%, 최저혈압은 상완 최저혈압의 46%에 해당하는 것을 확인하여 상관성을 추출하였다, 상완혈압이 정상, 고혈압 및 뇌졸중 환자를 대상으로 측정한 결과, 두 혈압간 상관성에 큰 차이가 있음을 확인하였다. 이는 상완혈압 측정에 의존한 진단보다 두부혈압 측정에 의해 더 중요한 진단요소를 추출할 수 있어서 더 정확한 진단을 할 수 있음을 의미한다. 따라서, 뇌혈류에 이상이 있을 때 달라지는 두부혈압을 측정하여 상완혈압과의 상관성을 추출하고, 환자를 대상으로 분석하여 뇌혈류 상태를 진단/개선함으로써 새로운 진단체계를 구축할 수 있는 시스템을 개발하였다.

• 대한의용생체공학회:의공학회지
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• 제28권4호
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• pp.569-576
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• 2007

Ventricular Assist Device(VAD) has switched its goal from a short-tenn use for bridge-to-transplantation to a long-tenn use for destination therapy, With this goal, the importance of long-tenn reliability gets more interests and importances, H-VAD is an portable extracorporeal biventricular assist device, and adopts an electro-pneumatic driving mechanism. The pneumatic pressure to pump out blood is generated with compression of bellows, and is transmitted in a closed pneumatic circuit through a pneumatic line. The existing pneumatic VAD adopts a air compressor which can generate stable pressures but has defects such as a noise and a size problem. Thus, it is not suitable for being used as a portable device, These problems are covered with adopting a closed pneumatic circuit mechanism with a bellows which has a small size and small noise generation, but it has defects that improper pneumatic setting causes a failure of adequate flow generation. In this study, the pneumatic pressure regulation system is developed to cover these defects of a bellows-type pneumatic VAD. The optimal pneumatic pressure conditions according to various afterload conditions for an optimal flow rate were investigated and the afterload estimation algorithm was developed, The final pneumatic regulation system estimates a current afterload and regulate the pneumatic pressure to the optimal point at a given afterload condition. The afterload estimation algorithm showed a sufficient performance that the standard deviation of error is 8.8 mmHg, The pneumatic pressure regulation system showed a sufficient performance that the flow rate was stably governed to various afterload conditions. In a further study, if a additional sensor such as ultrasonic sensor is developed to monitor the direct movement of diaphragm in a blood pump part, the reliability would be greatly increased. Moreover, if the afterload estimation algorithm gets more accuracy, it would be also helpful to monitor the hemodynamic condition of patients.

• 지역사회간호학회지
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• 제19권2호
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• pp.157-166
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• 2008

This study was conducted with whole home care nurses nationwide to provide secondary analyzed data to understand on their usage of medical equipments and their need of them for a month. This study found that treatments given by home care nurses were nelaton catheterization, bladder washing/urethral washing, newborn care, exchange and care for nasogastric tube and suction in that order of frequency. Second, instruments and equipments used for home care were reported to be stethoscope, patient monitor, blood pressure measuring equipment, air flotation mattresses, beds for patients, mattresses, suctioning device sets, enteral feeding equipment and dressing set in that oder of frequency. Moreover, need assessment of medical instruments and equipments showed renal dialysis was most needed and patient monitor, blood pressure measuring equipment, enteral feeding equipment, solution and other supplies for renal dialysis and beds for patient were necessary in that order. In conclusion, the results of this study investigating special treatments and medical instruments and equipments used for home care patients and analyzing patients' need, were expected to be useful for expansion of application of long-term care insurance for the elderly and health insurance as well as for quality control of home care and development of medial instruments and equipments used at home.