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Inertial sensors

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https://www.readbyqxmd.com/read/28800443/a-novel-approach-to-spinal-3-d-kinematic-assessment-using-inertial-sensors-towards-effective-quantitative-evaluation-of-low-back-pain-in-clinical-settings
#1
Sajad Ashouri, Mohsen Abedi, Masoud Abdollahi, Farideh Dehghan Manshadi, Mohamad Parnianpour, Kinda Khalaf
This paper presents a novel approach for evaluating LBP in various settings. The proposed system uses cost-effective inertial sensors, in conjunction with pattern recognition techniques, for identifying sensitive classifiers towards discriminate identification of LB patients. 24 healthy individuals and 28 low back pain patients performed trunk motion tasks in five different directions for validation. Four combinations of these motions were selected based on literature, and the corresponding kinematic data was collected...
August 4, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28796626/matrix-and-tensor-completion-on-a-human-activity-recognition-framework
#2
Sofia Savvaki, Grigorios Tsagkatakis, Athanasia Panousopoulou, Panagiotis Tsakalides
Sensor-based activity recognition is encountered in innumerable applications of the arena of pervasive healthcare and plays a crucial role in biomedical research. Nonetheless, the frequent situation of unobserved measurements impairs the ability of machine learning algorithms to efficiently extract context from raw streams of data. In this work, we study the problem of accurate estimation of missing multi-modal inertial data and we propose a classification framework that considers the reconstruction of sub-sampled data during the test phase...
August 7, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28796184/a-heterogeneous-sensing-system-based-method-for-unmanned-aerial-vehicle-indoor-positioning
#3
Can Wang, Kang Li, Guoyuan Liang, Haoyao Chen, Sheng Huang, Xinyu Wu
The indoor environment has brought new challenges for micro Unmanned Aerial Vehicles (UAVs) in terms of their being able to execute tasks with high positioning accuracy. Conventional positioning methods based on GPS are unreliable, although certain circumstances of limited space make it possible to apply new technologies. In this paper, we propose a novel indoor self-positioning system of UAV based on a heterogeneous sensing system, which integrates data from a structured light scanner, ultra-wideband (UWB), and an inertial navigation system (INS)...
August 10, 2017: Sensors
https://www.readbyqxmd.com/read/28790972/investigation-of-anticipatory-postural-adjustments-during-one-leg-stance-using-inertial-sensors-evidence-from-subjects-with-parkinsonism
#4
Gianluca Bonora, Martina Mancini, Ilaria Carpinella, Lorenzo Chiari, Maurizio Ferrarin, John G Nutt, Fay B Horak
The One-Leg Stance (OLS) test is a widely adopted tool for the clinical assessment of balance in the elderly and in subjects with neurological disorders. It was previously showed that the ability to control anticipatory postural adjustments (APAs) prior to lifting one leg is significantly impaired by idiopathic Parkinson's disease (iPD). However, it is not known how APAs are affected by other types of parkinsonism, such as frontal gait disorders (FGD). In this study, an instrumented OLS test based on wearable inertial sensors is proposed to investigate both the initial anticipatory phase and the subsequent unipedal balance...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28777300/a-visual-based-approach-for-indoor-radio-map-construction-using-smartphones
#5
Tao Liu, Xing Zhang, Qingquan Li, Zhixiang Fang
Localization of users in indoor spaces is a common issue in many applications. Among various technologies, a Wi-Fi fingerprinting based localization solution has attracted much attention, since it can be easily deployed using the existing off-the-shelf mobile devices and wireless networks. However, the collection of the Wi-Fi radio map is quite labor-intensive, which limits its potential for large-scale application. In this paper, a visual-based approach is proposed for the construction of a radio map in anonymous indoor environments...
August 4, 2017: Sensors
https://www.readbyqxmd.com/read/28767683/quantifying-kinematic-differences-between-land-and-water-during-squats-split-squats-and-single-leg-squats-in-a-healthy-population
#6
Anna C Severin, Brendan J Burkett, Mark R McKean, Aaron N Wiegand, Mark G L Sayers
Aquatic exercises can be used in clinical and sporting disciplines for both rehabilitation and sports training. However, there is limited knowledge on the influence of water immersion on the kinematics of exercises commonly used in rehabilitation and fitness programs. The aim of this study was to use inertial sensors to quantify differences in kinematics and movement variability of bodyweight squats, split squats, and single-leg squats performed on dry land and whilst immersed to the level of the greater trochanter...
2017: PloS One
https://www.readbyqxmd.com/read/28767546/a-pilot-study-of-horizontal-head-and-eye-rotations-in-baseball-batting
#7
Nick Fogt, Tyler W Persson
PURPOSE: The purpose of the study was to measure and compare horizontal head and eye tracking movements as baseball batters "took" pitches and swung at baseball pitches. METHODS: Two former college baseball players were tested in two conditions. A pitching machine was used to project tennis balls toward the subjects. In the first condition, subjects acted as if they were taking (i.e., not swinging) the pitches. In the second condition, subjects attempted to bat the pitched balls...
August 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28766177/using-needle-orientation-sensing-as-surrogate-signal-for-respiratory-motion-estimation-in-percutaneous-interventions
#8
Momen Abayazid, Takahisa Kato, Stuart G Silverman, Nobuhiko Hata
PURPOSE: To develop and evaluate an approach to estimate the respiratory-induced motion of lesions in the chest and abdomen. MATERIALS AND METHODS: The proposed approach uses the motion of an initial reference needle inserted into a moving organ to estimate the lesion (target) displacement that is caused by respiration. The needles position is measured using an inertial measurement unit (IMU) sensor externally attached to the hub of an initially placed reference needle...
August 1, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28761187/response-to-acupuncture-treatment-in-horses-with-chronic-laminitis
#9
Babak Faramarzi, Dongbin Lee, Kevin May, Fanglong Dong
There is a need for evidence-based scientific research to address the question of the effectiveness of acupuncture in improving clinical signs of laminitis in horses. The objective of this study was to compare lameness levels before and after 2 acupuncture treatments in horses with chronic laminitis. Twelve adult horses with chronic laminitis received 2 acupuncture treatments 1 week apart. The points were treated using dry needling, hemo-acupuncture, and aqua-acupuncture. Lameness level was objectively evaluated using an inertial sensor-based lameness evaluation system (Lameness Locator), as well as routine examinations following American Association of Equine Practitioners scoring before the first and 1 week after the second acupuncture treatment...
August 2017: Canadian Veterinary Journal. la Revue Vétérinaire Canadienne
https://www.readbyqxmd.com/read/28758935/a-solar-position-sensor-based-on-image-vision
#10
Adolfo Ruelas, Nicolás Velázquez, Carlos Villa-Angulo, Alexis Acuña, Pedro Rosales, José Suastegui
Solar collector technologies operate with better performance when the Sun beam direction is normal to the capturing surface, and for that to happen despite the relative movement of the Sun, solar tracking systems are used, therefore, there are rules and standards that need minimum accuracy for these tracking systems to be used in solar collectors' evaluation. Obtaining accuracy is not an easy job, hence in this document the design, construction and characterization of a sensor based on a visual system that finds the relative azimuth error and height of the solar surface of interest, is presented...
July 29, 2017: Sensors
https://www.readbyqxmd.com/read/28750967/joint-amplitude-mems-based-measurement-platform-for-low-cost-and-high-accessibility-telerehabilitation-elbow-case-study
#11
Mauro Callejas-Cuervo, Rafael M Gutierrez, Andres I Hernandez
This paper, presents an inertial and magnetic sensor based technological platform, intended for articular amplitude monitoring and telerehabilitation processes considering an efficient cost/technical considerations compromise. The particularities of our platform offer possibilities of a high social impact by making telerehabilitation accessible to large population sectors in marginal socio-economic sectors, especially in underdeveloped countries where, in contrast to developed countries, specialists are scarce and high technology is not available or inexistent...
July 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28748830/a-neural-network-with-central-pattern-generators-entrained-by-sensory-feedback-controls-walking-of-a-bipedal-model
#12
Wei Li, Nicholas Stephen Szczecinski, Roger D Quinn
A neuromechanical simulation of a planar, bipedal walking robot has been developed. It is constructed as a simplified, planar musculoskeletal model of the biomechanics of the human lower body. The controller consists of a dynamic neural network with central pattern generators (CPGs) entrained by force and movement sensory feedback to generate appropriate muscle forces for walking. The CPG model is a two-level architecture, which consists of separate rhythm generator (RG) and pattern formation (PF) networks...
July 27, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28746383/validation-of-functional-calibration-and-strap-down-joint-drift-correction-for-computing-3d-joint-angles-of-knee-hip-and-trunk-in-alpine-skiing
#13
Benedikt Fasel, Jörg Spörri, Pascal Schütz, Silvio Lorenzetti, Kamiar Aminian
To obtain valid 3D joint angles with inertial sensors careful sensor-to-segment calibration (i.e. functional or anatomical calibration) is required and measured angular velocity at each sensor needs to be integrated to obtain segment and joint orientation (i.e. joint angles). Existing functional and anatomical calibration procedures were optimized for gait analysis and calibration movements were impractical to perform in outdoor settings. Thus, the aims of this study were 1) to propose and validate a set of calibration movements that were optimized for alpine skiing and could be performed outdoors and 2) to validate the 3D joint angles of the knee, hip, and trunk during alpine skiing...
2017: PloS One
https://www.readbyqxmd.com/read/28744040/an-estimation-of-knee-and-ankle-joint-angles-during-extension-phase-of-standing-up-motion-performed-using-an-inertial-sensor
#14
Fang Jin, Takayuki Nagasaki, Chikamune Wada
[Purpose] Motion capture system is difficult to use in daily life. The aim of this study was to propose an estimation model for knee and ankle joint angle measurements and locate body center of gravity (COG) of the extension phase during standing-up motion. [Subjects and Methods] Seven healthy male volunteers were enrolled. An estimation model was proposed for the knee and ankle joint angle measurements by combining the angle and acceleration of the trunk, based on readings from the inertial sensor attachment on the subject's chest, during the extension phase...
July 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28731981/technology-in-strength-and-conditioning-assessing-bodyweight-squat-technique-with-wearable-sensors
#15
Martin A OʼReilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian M Caulfield
O'Reilly, MA, Whelan, DF, Ward, TE, Delahunt, E, and Caulfield, BM. Technology in strength and conditioning: assessing bodyweight squat technique with wearable sensors. J Strength Cond Res 31(8): 2303-2312, 2017-Strength and conditioning (S&C) coaches offer expert guidance to help those they work with achieve their personal fitness goals. However, it is not always practical to operate under the direct supervision of an S&C coach and consequently individuals are often left training without expert oversight. Recent developments in inertial measurement units (IMUs) and mobile computing platforms have allowed for the possibility of unobtrusive motion tracking systems and the provision of real-time individualized feedback regarding exercise performance...
August 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28726022/quantification-of-hand-motor-symptoms-in-parkinson-s-disease-a-proof-of-principle-study-using-inertial-and-force-sensors
#16
Josien C van den Noort, Rens Verhagen, Kees J van Dijk, Peter H Veltink, Michelle C P M Vos, Rob M A de Bie, Lo J Bour, Ciska T Heida
This proof-of-principle study describes the methodology and explores and demonstrates the applicability of a system, existing of miniature inertial sensors on the hand and a separate force sensor, to objectively quantify hand motor symptoms in patients with Parkinson's disease (PD) in a clinical setting (off- and on-medication condition). Four PD patients were measured in off- and on- dopaminergic medication condition. Finger tapping, rapid hand opening/closing, hand pro/supination, tremor during rest, mental task and kinetic task, and wrist rigidity movements were measured with the system (called the PowerGlove)...
July 19, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28718788/implementation-of-an-imu-aided-image-stacking-algorithm-in-a-digital-camera-for-unmanned-aerial-vehicles
#17
Ahmad Audi, Marc Pierrot-Deseilligny, Christophe Meynard, Christian Thom
Images acquired with a long exposure time using a camera embedded on UAVs (Unmanned Aerial Vehicles) exhibit motion blur due to the erratic movements of the UAV. The aim of the present work is to be able to acquire several images with a short exposure time and use an image processing algorithm to produce a stacked image with an equivalent long exposure time. Our method is based on the feature point image registration technique. The algorithm is implemented on the light-weight IGN (Institut national de l'information géographique) camera, which has an IMU (Inertial Measurement Unit) sensor and an SoC (System on Chip)/FPGA (Field-Programmable Gate Array)...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28715333/wheelchair-neuroprosthesis-for-improving-dynamic-trunk-stability
#18
Kramay Patel, Matija Milosevic, Kimitaka Nakazawa, Milos R Popovic, Kei Masani
Trunk instability is a major problem for individuals with thoracic and cervical spinal cord injury. Functional electrical stimulation (FES) neuroprosthesis, a technology that uses small electrical currents to artificially contract muscles, has previously been utilized to improve trunk stability during quasistatic and dynamic sitting. The aim of this study was to develop the first powered wheelchair-based neuroprosthesis and to test its feasibility for improving trunk stability. Eleven male, able-bodied individuals participated in the feasibility study...
July 14, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28714888/a-multiscale-approach-to-the-smart-deployment-of-micro-sensors-over-lightweight-structures
#19
Giovanni Capellari, Francesco Caimmi, Matteo Bruggi, Stefano Mariani
A topology optimization approach has been recently proposed to maximize the sensitivity to damage of measurements, collected through a network of sensors to be deployed over thin plates for structural health monitoring purposes. Within such a frame, damage is meant as a change in the structural health characterized by a reduction of relevant stiffness and load-carrying properties. The sensitivity to a damage of unknown amplitude and location is computed by comparing the response to the external actions of the healthy structure and of a set of auxiliary damaged structures, each one featuring reduced mechanical properties in a small region only...
July 15, 2017: Sensors
https://www.readbyqxmd.com/read/28708542/an-ambulatory-gait-monitoring-system-with-activity-classification-and-gait-parameter-calculation-based-on-a-single-foot-inertial-sensor
#20
Minsu Song, Jonghyun Kim
GOAL: For healthcare and clinical use, ambulatory gait monitoring systems using inertial sensors have been developed to estimate the user gait parameters, such as walking speed, stride time, and stride length. However, to adapt the systems effectively to daily-life activities, they need to be able to classify the gait activities of daily-life to obtain the parameters for each activity. In this study, we propose a simple classification algorithm based on a single inertial sensor for ease of use, which classifies three major gait activities: leveled walk, ramp walk, and stair walk...
July 12, 2017: IEEE Transactions on Bio-medical Engineering
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