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Sitting posture recognition by body pressure distribution and airbag regulation strategy based on seat comfort evaluation

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JOURNAL OF ENGINEERING-JOE 2019年第23期2019卷 8910-8914页

作者： Jiang Yongxiang Duan Jingle Deng Sanpeng Qi Yuming Wang Peng Wang Zijing Zhang Tianjiang Tianjin Univ Technol & Educ Tianjin Peoples R China Tianjin Univ Technol & Educ Inst Robot & Intelligent Equipment Tianjin Peoples R China Tianjin Tianda Lean Technol Co Ltd Tianjin Peoples R China Tianjin Taihua Easy Robot Sci & Technol Co Ltd Tianjin Peoples R China

Unbalanced body pressure distribution caused by poor sitting posture is a significant factor causing lumbar disease. Research on the dynamic adjustment strategy for comfort sitting posture is of great significance to the prevention and improvement of lumbar disease. In this study, based on the pressure sensor array, the body pressure distribution in different sitting postures are obtained, including: back bow, waist bow, body slip, body right leaning, standard sitting position, and body left leaning. The recognition of the human body posture was achieved using the support vector machine algorithm and the accuracy rate reach to 83.33%. Furthermore, the evaluation indicators for sitting comfort of the human body are proposed using the maximum pressure, average pressure, maximum pressure gradient, average pressure gradient and asymmetry coefficient, the accuracy of the above indicators were verified using semantic differential subjective evaluation method. Experimental results show that there is a strong positive correlation between objective indicators and seat comfort. In addition, the dynamic adjustment strategy using airbag base on seat comfort evaluation is studied.

关键词： diseases sensor arrays automotive components seats pressure measurement pressure sensors support vector machines biomechanics ergonomics human body posture maximum pressure gradient average pressure gradient asymmetry coefficient dynamic adjustment strategy airbag base seat comfort evaluation posture recognition airbag regulation strategy unbalanced body pressure distribution poor sitting posture lumbar disease comfort sitting posture pressure sensor array different sitting postures body slip standard sitting position

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Dipole Source Localization Based on Least Square Method and 3D Printing

Dipole Source Localization Based on Least Square Method and ...

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IEEE International Conference on Mechatronics and Automation

作者： Xin Lin Yong Zhang Mingjiang Ji Xiande Zheng Kehong Lv Jing Qiu Guanjun Liu College of Artificial Intelligence National University of Defense Technology Changsha Hunan China

For the exploration of new underwater sensing technique, a method of dipole source localization is proposed based on least square method and 3D printing. A pressure sensor array using 3D printing is developed;the pressure field of dipole source is modelled and the experiment data in static water are collected to work out the position of dipole source through least square method. The change rule of localization error is discussed in the direction parallel with the sensor array and perpendicular with it, respectively. The experiment results show that the average error of the absolute values of localization errors is 8.8 mm, 5.54% relative to the length of sensor array and the least error is 0.1mm in the direction parallel with the sensor array. In the other direction, the average error of the absolute values of localization errors is 11.5 mm, 7.2% relative to the length of sensor array and the least error is 0.5mm. Dipole source localization is available with pressure sensor array.

关键词： Dipole source localization pressure sensor array 3D printing Least square method

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Calibration of pressure sensor array Based on Information Fusion

Calibration of Pressure Sensor Array Based on Information Fu...

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The 2011 International Conference on Electric and Electronics(EEIC 2011)

作者： Bing Guo Xiaohong Zeng Chongqing Technology and Business Institute Chongqing College of Electronic Engineering

It is existence of cross-sensitivity factors such as the temperature, humidity and power fluctuations in pressure sensor array. To solve this problem, it is proposed an information fusion based on the pressure sensor array calibration algorithm. By this method can effectively eliminate the environmental temperature and voltage disturbances and other non-target parameters, and crosstalk between large-scale sensor array signal output of pressure sensor array characteristics. It is improved system stability and reliability. Experimental results show that the information fusion processing algorithms realize the precise calibration of the pressure sensor array, the effective sensor array measurement data to ensure the accuracy and reliability of the results.

关键词： pressure sensor array Information Fusion Calibration

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A PERSONAL NAVIGATION SYSTEM USING MEMS-BASED HIGH-DENSITY GROUND REACTION sensor array AND INERTIAL MEASUREMENT UNIT 18

A PERSONAL NAVIGATION SYSTEM USING MEMS-BASED HIGH-DENSITY G...

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18th International Conference on Solid-State sensors, Actuators and Microsystems (TRANSDUCERS)

作者： Guo, Q. Bebek, O. Cavusoglu, M. C. Mastrangelo, C. H. Young, D. J. Univ Utah Salt Lake City UT 84112 USA Ozyegin Univ Istanbul Turkey Case Western Reserve Univ Cleveland OH USA

ISBN: (纸本)9781479989553

This paper describes a prototype personal navigation system developed for position tracking under GPS denied environments by employing a commercial inertial measurement unit (IMU) and a MEMS-based ground reaction sensor array (GRSA). The GRSA is used to provide zero-velocity updating for the IMU. A Kalman filter further estimates the IMU output bias during the zero-velocity period, which is then removed from the IMU's subsequent output signals to improve the navigation accuracy. Seven 10-minute square-loop walking tests were performed to achieve an in-plane navigation accuracy ranging from 0.4 meter to 3.4 meter with a vertical position accuracy of approximately 1 meter. A further improved performance over an extended navigation time is expected through enhancing the GRSA sensitivity.

关键词： Personal navigation pedestrian navigation inertial navigation dead reckoning IMU bias ZUPTing ground reaction sensor array pressure sensor array tactile sensor array Kalman filter capacitance-to-voltage converter

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A PERSONAL NAVIGATION SYSTEM USING MEMS-BASED HIGH-DENSITY GROUND REACTION sensor array AND INERTIAL MEASUREMENT UNIT

A PERSONAL NAVIGATION SYSTEM USING MEMS-BASED HIGH-DENSITY G...

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International Conference on Solid-State sensors, Actuators and Microsystems

作者： Q. Guo O. Bebek M. C. Cavusoglu C. H. Mastrangelo D. J. Young The University of Utah Salt Lake City Utah USA The Ozyegin University Istanbul Turkey Case Western Reserve University Cleveland Ohio USA

ISBN: (纸本)9781479989560

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Unobtrusive Sleep Stage Identification Using a pressure-Sensitive Bed Sheet

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IEEE sensorS JOURNAL 2014年第7期14卷 2092-2101页

作者： Samy, Lauren Huang, Ming-Chun Liu, Jason J. Xu, Wenyao Sarrafzadeh, Majid Univ Calif Los Angeles Dept Comp Sci Los Angeles CA 90095 USA Univ Calif Los Angeles Wireless Hlth Inst Los Angeles CA 90095 USA

Sleep constitutes a big portion of our lives and is a major part of health and well-being. Monitoring the quality of sleep can aid in the medical diagnosis of a variety of sleep and psychiatric disorders and can serve as an indication of several chronic diseases. Sleep stage analysis plays a pivotal role in the evaluation of the quality of sleep and is a proven biometric in diagnosing cardiovascular disease, diabetes, and obesity [32]. We describe an unobtrusive framework for sleep stage identification based on a high-resolution pressure-sensitive e-textile bed sheet. We extract a set of sleep-related biophysical and geometric features from the bed sheet and use a two-phase classification procedure for Wake -Non Rapid Eye Movement Rapid Eye Movement stage identification. A total of seven allnight polysomnography recordings from healthy subjects were used to validate the proposed bed sheet system and the ability to extract sleep stage information from it. When compared with the gold standard, the described system achieved 70.3% precision and 71.1% recall on average. These results suggest that unobtrusive sleep macrostructure analysis could be a viable option in clinical and home settings in the near future. Compared with existing techniques for sleep stage identification, the described system is unobtrusive, fits seamlessly into the user's familiar sleep environment, and has additional advantages of comfort, low cost, and simplicity.

关键词： Sleep staging sleep quality polysomnography respiratory rate bed sheet pressure sensor array unobtrusive e-textile

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A Development of Force Distribution Measurement System with High Resolution for Total Knee Arthroplasty

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JOURNAL OF ADVANCED COMPUTATIONAL INTELLIGENCE AND INTELLIGENT INFORMATICS 2014年第2期18卷 213-220页

作者： Som, Mohd Hanafi Mat Nagamune, Kouki Kamiya, Takashi Kawaguchi, Shogo Takayama, Koji Matsumoto, Tomoyuki Kuroda, Ryosuke Kurosaka, Masahiro Univ Fukui Grad Sch Engn 3-9-1 Bunkyo Fukui Fukui 9100017 Japan Univ Malaysia Perlis Sch Mechatron Engn Arau 02600 Perlis Malaysia Kobe Univ Grad Sch Med Chuo Ku Kobe Hyogo 6500017 Japan

Soft tissue or ligament balancing in total knee arthroplasty is important for ensuring knee joint stability. Correct balancing and appropriate alignment of ligaments extend prosthesis life by preventing unnecessary force from acting on the prosthesis during routine activities. The current implementation of total knee arthroplasty relies heavily on the subjective "feel" of the surgeon for correct prosthesis implantation onto tibiofemoral components. We developed a force distribution sensing system to provide quantitative information to surgeons during ligament balancing. The measurement system consists of two main components: two force sensors embedded in trial insert for each condyle and signal acquisition for data processing and force visualization. sensors were designed and developed using pressure-sensitive conductive rubber that measures changes in resistance in the event of deformation caused by external force. Corresponding voltage measured by circuits is transmitted via an RF transceiver to a computer and visualized as color gradient. Current sensors could measure maximum force of 196.13 N (20 kgf). Results from calibration and experiments on a plastic trial prosthesis indicated that the device has good potential for providing appropriate force distribution information on the knee during total knee arthroplasty procedure.

关键词： total knee arthroplasty (TKA) soft tissue balance pressure sensor array conductive rubber

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Ambient Context in Breathing Signal Fusion

Ambient Context in Breathing Signal Fusion

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9th IEEE International Symposium on Medical Measurements and Applications (IEEE MeMeA)

作者： Holtzman, M. Knoefel, F. Carleton Univ Dept Syst & Comp Engn 1125 Colonel By Dr Ottawa ON K1S 5B6 Canada Bruyere Continuing Care Ottawa ON K1N 5C8 Canada Elisabeth Bruyere Res Inst Ottawa ON K1N 5C8 Canada

ISBN: (纸本)9781479929214

Fusion of ambient breathing signals can be hampered by the current environmental conditions. Fusion methods that are resistant to most adverse ambient conditions may still be susceptible to some. The diversity of multiple fusion methods can be leveraged by employing a variety of fusion methods to fuse each breathing epoch. By using a trained linear classifier to select the best candidate fusion method according to current condition estimates, a more robust system is proposed. Regularization by feature selection and method selection were addressed. The final system used two fusion methods and ten ambient features to outperform the single best fusion method. The system increased the percentage of epochs with good signal quality by 5%. Analysis of optimal fusion method selection indicates that further improvement is also possible.

关键词： pressure sensor array linear diversity combining data fusion unobtrusive monitoring respiratory signal

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Coherent Marine Radar Measurements of Directional Wave Spectra using Vertically Polarized Antennas in Moderate and Shoaling Depths

Coherent Marine Radar Measurements of Directional Wave Spect...

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Oceans Conference

作者： Trizna, Dennis B. Imaging Sci Res Inc 6103B Virgo Court Burke VA 22015 USA

ISBN: (纸本)9781479936465

A coherent marine radar (COHrad), and modified standard marine radar with coherent-on-receive capability (CORrad), have been developed for radial Doppler measurements. Each measures the radial component of the radar echo, and can be used for determination of both the echo intensity and the orbital wave velocity spatial maps of ocean waves, as well as the mean radial ocean surface velocity. These radars allow direct measurement of the ocean wave spectrum by means of 3D-FFT processing of a sequence of coherent radar images of orbital wave spatial patterns. COHrad now has a 2.5-s rotation rate, so 256 rotations take just over ten minutes, with frequency alias at 0.2 Hz, while CORrad uses 1.25-s, 512 images, and 0.4 H alias. Radial current maps are obtained by summing all 256 radial velocity images, forcing orbital wave patterns to blend to the mean, and gives a map of mean radial current at the very surface. We present results of radar measurements of radial current and RMS waveheight for both COH and COR radars, using both horizontally and vertically polarized antennas. The latter are found to mitigate against errors in rms wave height retrieval for high wave conditions, when breaking features generate errors for horizontal polarization. Results are presented of time series of 16 frequency components of omni-directional spectra and compared with data from a pressure sensor array at the U.S. Army Field Research Facility in Duck, NC.

关键词： Doppler radar antenna radiation patterns fast Fourier transforms image sequences marine radar ocean waves oceanographic equipment oceanographic techniques radar antennas radar imaging 3D-FFT processing COHrad CORrad RMS wave height retrieval coherent marine radar measurements coherent radar image sequence coherent-on-receive capability directional wave spectra echo intensity error mitigation high wave conditions horizontally polarized antennas mean radial ocean surface velocity modified standard marine radar ocean wave spectrum omnidirectional spectra orbital wave spatial patterns orbital wave velocity spatial maps pressure sensor array radar echo radial Doppler measurements radial component radial current maps shoaling depths time 1.25 s time 2.5 s time series vertically polarized antennas Antenna measurements Radar antennas Radar imaging Radar measurements Sea measurements

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Design and evaluation of a skin-like sensor with high stretchability for contact pressure measurement

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sensorS AND ACTUATORS A-PHYSICAL 2013年 204卷 114-121页

作者： Zhou, Debao Wang, Haopeng Univ Minnesota Dept Mech & Ind Engn Duluth MN 55812 USA Univ Sci & Technol Beijing Sch Mech Engn Beijing 100083 Peoples R China

This paper presents the development of a new type of skin-like tactile pressure sensor array. The sensor array is scalable, flexible and stretchable and can measure pressure up to 250 kPa within 30% stretching rate without damaging its mechanical structure. It can also conform to irregular three-dimensional surfaces. The sensor array consists of three layers. The top and bottom layers are formed by the array of parallel conductive strips made of silver nanowires (AgNWs) embedded in polydimethylsiloxane (PDMS) thin films. The AgNWs/PDMS conductor strips are used as stretchable interconnections to transmit electrical signals. The middle layer is made of PDMS. This film is pre-molded with holes filling with cylinder-shaped conductive elastomer for pressure measurement. In this paper, the characteristic of the AgNWs/PDMS conductor strips as stretchable interconnections is studied. The piezoresistive properties of the sensels (one sensing element is called a sensel) were measured and discussed. The performance of the tactile sensor array under stretching was also tested. With the associated scanning power-supply circuit and data acquisition system, it is demonstrated that the system can successfully capture the tactile images induced by objects of different shapes. Such sensor system could be applied on curved or non-planar surfaces in robots or medical devices for force detection and feedback. (C) 2013 Elsevier B.V. All rights reserved.

关键词： pressure sensor array Skin-like High stretchability Cylinder-shaped sensing elements Silver nanowire interconnection

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