Smartphone Based Standing Balance Evaluation Using Frequency Domain Analysis of Acceleration

Hwang, Jisun; Hwang, Seonhong

doi:10.12674/ptk.2018.25.3.027

Cited by 2 publications

(1 citation statement)

References 37 publications

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“…Clinics use a lot of equipment to measure center of pressure (COP) in force plate and insole, but it is expensive and requires a large space and expertise [10,11]. On the other hand, smartphones have less space-time constraints, and frequency collection using acceleration sensors shows high potential for static balance evaluation [12].…”

Section: Introductionmentioning

confidence: 99%

Reliability and Validity Study of Inertial Sensor-Based Application for Static Balance Measurement

Park

Jang

Kim

et al. 2022

Phys Ther Rehabil Sci

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Objective: To investigate the reliability and validity of static balance measurements using an acceleration sensor and a gyroscope sensor in smart phone inertial sensors. Design: Equivalent control group pretest-posttest.Methods: Subjects were forty five healthy adults aged twenty to fifty-years-old who had no disease that could affect the experiment. After pre-test, all participants wore a waist band with smart phone, and conducted six static balance measurements on the force plate twice for 35 seconds each. To investigate the test-retest reliability of both smart phone inertial sensors, we compared the intra-correlation coefficient (ICC 3, 1) between primary and secondary measurements with the calculated root mean scale-total data. To determine the validity of the two sensors, it was measured simultaneously with force plate, and the comparision was done by Pearson's correlation. Results:The test-retest reliability showed excellent correlation for acceleration sensor, and it also showed excellent to good correlation for gyroscope sensor(p＜0.05). The concurrent validity of smartphone inertial sensors showed a mostly poor to fair correlation for tandem-stance and one-leg-stance (p＜0.05) and unacceptable correlation for the other postures (p＞0.05). The gyroscope sensor showed a fair correlation for most of the RMS-Total data, and the other data also showed poor to fair correlation (p＜0.05). Conclusions:The result indicates that both acceleration sensor and gyroscope sensor has good reliability, and that compared to force plate, acceleration sensor has unacceptable or poor correlation, and gyroscope sensor has mostly fair correlation.

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Section: Introductionmentioning

confidence: 99%

Reliability and Validity Study of Inertial Sensor-Based Application for Static Balance Measurement

Park

Jang

Kim

et al. 2022

Phys Ther Rehabil Sci

View full text Add to dashboard Cite

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Consideration Factors in Application of Thermocouple Sensors for RCS Temperature Instrumentation

2020

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Because of harsh radiated environmental conditions, it is necessary to use thermocouples (TCs) in the temperature instrumentation channels of a reactor coolant system (RCS) in an integrated pressurized water reactor vessel. Conventionally, resistance temperature detectors (RTDs) have been adopted for RCS temperature measurement. Therefore, we have conducted an analysis and review of instrumentation error factors in the measurement circuits of RTD and TC sensors to specify the influence on measurement accuracy for application of TCs instead of RTDs for RCS temperature instrumentation. From the review and analysis results, it is anticipated that a measurement accuracy deterioration would be an issue and that a drift range should be investigated for the anticipated operational temperature conditions.

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Smartphone Based Standing Balance Evaluation Using Frequency Domain Analysis of Acceleration

Cited by 2 publications

References 37 publications

Reliability and Validity Study of Inertial Sensor-Based Application for Static Balance Measurement

Reliability and Validity Study of Inertial Sensor-Based Application for Static Balance Measurement

Consideration Factors in Application of Thermocouple Sensors for RCS Temperature Instrumentation

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