• Title/Summary/Keyword: Pressure measurement

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Accuracy Comparison of Blood Pressure among the Direct Measurement Method and Two Automatic Indirect Measurement Methods in the Patients with Various Blood Pressure (다양한 혈압상태에서 직접혈압을 기준으로 HP 자동혈압기와 국산자동혈압기의 정확도 비교)

  • Song Hyo-Sook;Jun Tae-Gook;Choi Eun-Jung;Kim Mi-Jung
    • Journal of Korean Academy of Fundamentals of Nursing
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    • v.8 no.3
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    • pp.366-378
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    • 2001
  • Objective: The purpose of this study was to identify differences in measurement methods for blood pressure (Direct measurement, HP automatic indirect measurement, and SE 7000 Korean made indirect measurement), and to evaluate the clinical trial of the Korean made automatic indirect blood pressure measurement. Material & Methods: From June, 1999 to February, 2000, fifty five consecutive patients were randomized into hypertension group (n=20), normotension group (n=20), and hypotension group (n= 15). Measuring blood pressure by indirect methods (HP NIBP M 1008B and SE 7000 NIBP Korean made) was done simultaneously in the same arm with arterial line for direct blood pressure measurement (HP M1006A). The procedures were repeated ten times at intervals of 2 minutes. Statistical analysis was Performed using SPSS (version 8.0 for windows) software package. Values were expressed as means and standard deviation and means were compared using t-test. Statistical significance was considered present with a p value less than 0.05. Results: In the hypertension group and noromotension group, the disparity between HP direct measurement and indirect SE 7000 NIBP did not show any differences compared to the disparity between HP direct measurement and indirect HP NIBP. In the hypotension group, the disparity in the diastolic pressure between HP direct measurement and indirect SE 7000 NIBP was significantly different compared to the disparity between HP direct measurement and indirect HP NIBP (p<0.001), however, disparities in systolic pressure did not showed any differences. Conclusion: Direct blood pressure measurement (HP M1006A) can be replaced with indirect blood pressure measurements (HP NIBP M 1008B & SE 7000 NIBP) in normotension and hypertension patients. Korean made indirect measurement was found to be more accurate compared to HP indirect measurement in hypotension Patients, but more study is needed.

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Development of an Embedded Foot Pressure Measurement System Using Time Division Measurement Method (시분할 측정기법을 이용한 임베디드 족압 측정 시스템 설계)

  • 김시경
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.11
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    • pp.1022-1027
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    • 2004
  • In this paper, an embedded foot pressure measurement system is proposed to measure foot pressure based on the embedded Linux system. To measure foot pressure data and to evaluate foot pressure distribution for the different insoles, FSR sensor, A/D converter, iPAQ PDA, and a time division measurement method are employed in the system. Utilizing this system, the foot pressure analysis has been performed for the different four shoes. The number of foot pressure/voltage conversion circuits are drastically decreased by the proposed time division measurement method from 406 to 14. The experimental results for the sandal, slipper, oxford shoes and sneakers demonstrate that the proposed system successfully performs the foot pressure measurement.

Development of a Pressure Measurement System with the Parallel Structure (병렬구조의 압력측정 시스템 개발)

  • Yun, Eui-Jung;Kim, Jwa-Yeon;Lee, Kang-Won;Lee, Seok-Tae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.4
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    • pp.328-333
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    • 2006
  • In this paper, we developed a pressure measurement apparatus with the parallel structure to improve the measurement efficiency of pressure sensors by reducing the measurement time of pressure. The developed system has two parallel positions for loading Silicon pressure sensor and has a dual valve structure. The semiconductor pressure sensors prepared by Copal Electronics were used to confirm the performance of the developed measurement system. Two stage differential amplifier circuit was employed to amplify the weak output signal and the amplified output signal was improved utilizing a low-pass filter. New apparatus shows the measurement time of pressure two times shorter than that of conventional one with the serial structure, while both structures show the similar linear output versus pressure characteristics.

Differences in Blood Pressure among Adults in the Community according to Blood Pressure Measurement Time and Age (지역사회 성인의 혈압측정횟수 및 연령에 따른 혈압의 차이)

  • Park, Kyung-Yeon
    • Journal of Korean Biological Nursing Science
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    • v.21 no.4
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    • pp.275-282
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    • 2019
  • Purpose: This study aimed to identify the differences in blood pressure among adults in the community according to age and time of the blood pressure measurement. Methods: This was a secondary analysis study, using data from a 2015 community health survey, conducted by the Korea Centers for Disease Control and Prevention. The data of three-time-measured blood pressure were collected from 337 subjects, 25, 35, 45, 55, 65, 75 years old, which are median ages by each age group. Results: The primary systolic pressure was significantly higher than the secondary systolic pressure (t= 3.46, p= .001) and the tertiary systolic pressure (t= 4.83, p= .001). The secondary systolic pressure was higher than the tertiary measurement (t= 2.05, p= .041). There was no significant difference between the three-time-measured values for diastolic pressure. There was a significant interaction between measurement times and age in the systoic blood pressure readings (F= 1.95, p= .036). However, there was no significant interaction between measurement times and age in the diastolic blood pressure readings (F= 1.03, p= .418). Conclusion: The findings suggest that attention must be paid to the use of blood pressure values in studies or one-time-measured clinical blood pressure values. In particular, the differences in systolic pressure readings taken at different times in the older age groups were significant. Therefore, it is more important to carefully assess blood pressure in adults over the age of 45 compared to other age groups.

Development of Pressure Control System of Contact Transducer for Measurement of Ultrasonic Nonlinear Parameter

  • Lee, In-Ho;Son, Dae-Soo;Choi, Ik-Hwang;Lee, Tae-Hun;Jhang, Kyung-Young
    • Journal of the Korean Society for Nondestructive Testing
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    • v.27 no.6
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    • pp.576-581
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    • 2007
  • Ultrasonic nonlinearity has been considered as a promising method to evaluate the micro damage of material; however, its magnitude is so small that its measurement is not easy. Especially, when we use contact PZT transducer, if the contacting pressure is not kept in constant during the measurement then there exists extraneous fluctuation in the measured nonlinearity caused by the unstable contact condition, In this paper, we developed a pneumatic control system to keep the contacting pressure of transducer in constant during the measurement and analyzed the effect of contacting pressure to the ultrasonic nonlinearity measurement As a result, we found that the pressure of transducer in our measurement system should be greater than 170 kPa to measure the ultrasonic nonlinear parameter in stable with no dependency on the contacting pressure.

Development of Plantar Pressure Measurement System and Personal Classification Study based on Plantar Pressure Image

  • Ho, Jong Gab;Kim, Dae Gyeom;Kim, Young;Jang, Seung-wan;Min, Se Dong
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.15 no.11
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    • pp.3875-3891
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    • 2021
  • In this study, a Velostat pressure sensor was manufactured to develop a plantar pressure measurement system and a C#-based application was developed to monitor and collect plantar pressure data in real time. In order to evaluate the characteristics of the proposed plantar pressure measurement system, the accuracy of plantar pressure index and personal classification was verified by comparing with MatScan, a commercial plantar pressure measurement system. As a result, the output characteristics according to the weight of the Velostat pressure sensor were evaluated and a trend line with the reliability of r2 = 0.98 was detected. The Root Mean Square Error(RMSE) of the weighted area was 11.315 cm2, the RMSE of the x coordinate of Center of Pressure(CoPx) was 1.036 cm and the RMSE of the y coordinate of Center of Pressure(CoPy) was 0.936 cm. Finally, inaccuracy of personal classification, the proposed system was 99.47% and MatScan was 96.86%. Based on the advantage of being simple to implement and capable of manufacturing at low cost, it is considered that it can be applied to various fields of measuring vital signs such as sitting posture and breathing in addition to the plantar pressure measurement system.

Estimation of Target and Completion Pressure during the Cuff Inflation Phase in Blood Pressure Measurement (혈압측정시 가압 단계에서 목표압력 및 측정 종료압력 추정)

  • Oh, Hong-Sic;Lee, Jong-Shill;Kim, Young-Soo;Shen, Dong-Fan;Kim, In-Young;Chee, Young-Joan
    • Journal of Biomedical Engineering Research
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    • v.29 no.5
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    • pp.371-375
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    • 2008
  • In blood pressure measurement, the oscillometric method detects and analyzes the pulse pressure oscillation while deflating the cuff around the arm. For its principle, one has to inflate cuff pressure above the subject's systolic pressure and deflate below the diastolic pressure. Most of the commercialized devices inflate until the fixed target pressure and deflate until the fixed completion pressure because there is no way to know the systolic and diastolic pressure before measurement. Too high target pressure makes stress to the subject and too low target pressure makes big error or long measurement time because of re-inflation. There are similar problems for inadequate completion pressure. In this study, we suggest new algorithm to set proper target and completion pressure for each subject by analyzing pressure waveform while inflating period. We compared our proposed method and auscultation method to see the errors of estimation. The differences between the two measurements were -4.02$\pm$4.80mmHg, -10.50$\pm$10.57mmHg and -0.78$\pm$5.l7mmHg for mean arterial pressure, systolic pressure and diastolic pressure respectively. Consequently, we could set the target pressure by 30 mmHg higher than our estimation and we could stop at 20mmHg lower than our estimated diastolic pressure. Using this method, we could reduce the measurement time.

Unsteady Pressure Measurement of Fan Stator Vane Using Pressure Sensitive Paint

  • Sakamoto, Kazuyuki;Tsuchiya, Naoki;Yamamoto, Masahiko;Hamano, Yasunori;Fujii, Kozo
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2004.03a
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    • pp.789-794
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    • 2004
  • The pressure sensitive paint (PSP) technique has been well established in external flow field. However, there are still unresolved issues in internal flow field. This work was focused on the application to unsteady pressure measurement of fan flow field. The PSP measurement system was established and the image processing software was developed. First, the performance of PSP was investigated at the static cell. Then the unsteady PSP measurement was carried out at fan test facility. PSP data images were acquired from the suction and pressure surface of stator vanes. Pressure distributions on the surface of the stator vane were detected non-intrusively. The issues of image acquisition and image processing were clarified through the practical PSP application to fan flow field.

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Respiration Measurement System using Textile Capacitive Pressure Sensor (전기용량성 섬유 압력센서를 이용한 호흡측정 시스템)

  • Min, Se-Dong;Yun, Young-Hyun;Lee, Chung-Keun;Shin, Hang-Sik;Cho, Ha-Kyung;Hwang, Seon-Cheol;Lee, Myoung-Ho
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.59 no.1
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    • pp.58-63
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    • 2010
  • In this paper, we proposed a wearable respiration measurement system with textile capacitive pressure sensor. Belt typed textile capacitive pressure sensor approach of respiration measurement, from which respiration signatures and rates can be derived in real-time for long-term monitoring, are presented. Belt typed textile capacitive pressure sensor has been developed for this measurement system. the distance change of two plates by the pressure of motion has been used for the respiration measurement in chest area. Respiration rates measured with the textile capacitive pressure sensor was compared with standard techniques on 8 human subjects. Accurate measurement of respiration rate with developed sensor system is shown. The data from the method comparison study is used to confirm theoretical estimates of change in capacitance by the distance change. The current version of respiratory rate detection system using textile capacitive pressure sensor can successfully measure respiration rate. It showed upper limit agreement of $3.7997{\times}10^{-7}$ RPM, and lower limit of agreement of $-3.8428{\times}10^{-7}$ RPM in Bland-Altman plot. From all subject, high correlation were shown(p<0.0001). The proposed measurement method could be used to monitor unconscious persons, avoiding the need to apply electrodes to the directly skin or other sensors in the correct position and to wire the subject to the monitor. Monitoring respiration using textile capacitive pressure sensor offers a promising possibility of convenient measurement of respiration rates. Especially, this technology offers a potentially inexpensive implementation that could extend applications to consumer home-healthcare and mobile-healthcare products. Further advances in the sensor design, system design and signal processing can increase the range and quality of the rate-finding, broadening the potential application areas of this technology.

Effectiveness of web based learning program on self efficacy, knowledge, and competence in measurement of blood pressure (웹 기반 학습 프로그램이 혈압측정에 대한 자기효능감, 지식 및 수행능력에 미치는 효과)

  • Lee, Sook-Hee
    • Journal of Korean Academy of Fundamentals of Nursing
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    • v.19 no.1
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    • pp.66-73
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    • 2012
  • Purpose: This study was done to identify the effectiveness of a web based learning program on self efficacy, knowledge, and competence in measurement of blood pressure in college nursing students. Method: This study was an experimental research study. Data were collected from April 20 to June 1. 2011. The participants were 68 first year nursing students (experimental group 37, control group 31). The collected data were analyzed with the PASW 18.0 program, using ${\chi}^2$-test, t-test, and Cronbach's ${\alpha}$. Results: The mean score for self efficacy in blood pressure measurement in the experimental group was 61.9 and in the control group 60.7. This result was statistically significant (t=3.301, p=.002). The mean score for knowledge of blood pressure measurement in the experimental group was 11.5 and in the control group 10.8. This result was statistically significant (t=2.910, p=.005). But effectiveness of competence in blood pressure measurement was not significant. Conclusion: The study results show that the web based learning program was effective for self efficacy and knowledge in blood pressure measurement but not for competence indicating.-a need to develop strategies to improve competence in blood presessure measurement for these students.