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https://www.readbyqxmd.com/read/29156576/stochastic-integration-h%C3%A2-filter-for-rapid-transfer-alignment-of-ins
#1
Dapeng Zhou, Lei Guo
The performance of an inertial navigation system (INS) operated on a moving base greatly depends on the accuracy of rapid transfer alignment (RTA). However, in practice, the coexistence of large initial attitude errors and uncertain observation noise statistics poses a great challenge for the estimation accuracy of misalignment angles. This study aims to develop a novel robust nonlinear filter, namely the stochastic integration H ∞ filter (SIH ∞ F) for improving both the accuracy and robustness of RTA. In this new nonlinear H ∞ filter, the stochastic spherical-radial integration rule is incorporated with the framework of the derivative-free H ∞ filter for the first time, and the resulting SIH ∞ F simultaneously attenuates the negative effect in estimations caused by significant nonlinearity and large uncertainty...
November 18, 2017: Sensors
https://www.readbyqxmd.com/read/29154694/gait-and-quiet-stance-performance-among-adolescents-after-concussion-symptom-resolution
#2
Justin Berkner, William P Meehan, Christina L Master, David R Howell
OBJECTIVE:   To prospectively examine adolescent athletes' gait and quiet-stance performance while concurrently completing a cognitive task acutely after concussion and after symptom resolution. SETTING:   Sport concussion clinic. DESIGN:   Participants diagnosed with a concussion completed a symptom inventory and single- and dual-task quiet-stance and gait evaluations within 21 days of injury and then again after symptom resolution...
November 20, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/29150746/correlation-between-quantitative-pivot-shift-and-generalized-joint-laxity-a-prospective-multicenter-study-of-acl-ruptures
#3
David Sundemo, Anna Blom, Yuichi Hoshino, Ryosuke Kuroda, Nicola Francesco Lopomo, Stefano Zaffagnini, Volker Musahl, James J Irrgang, Jón Karlsson, Kristian Samuelsson
PURPOSE: To investigate whether an increased magnitude of quantitative rotatory knee laxity is associated with a greater level of generalized joint laxity in ACL-injured and contralateral knees. METHODS: A total of 103 patients were enrolled across four international centers to undergo anatomic ACL reconstruction. Rotatory knee laxity was evaluated preoperatively, both in the awake state and under anesthesia, using the standardized pivot shift test. Two devices were used to quantify rotatory knee laxity; an inertial sensor, measuring the joint acceleration, and an image analysis system, measuring the lateral compartment translation of the tibia...
November 17, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29149063/estimating-stair-running-performance-using-inertial-sensors
#4
Lauro V Ojeda, Antonia M Zaferiou, Stephen M Cain, Rachel V Vitali, Steven P Davidson, Leia A Stirling, Noel C Perkins
Stair running, both ascending and descending, is a challenging aerobic exercise that many athletes, recreational runners, and soldiers perform during training. Studying biomechanics of stair running over multiple steps has been limited by the practical challenges presented while using optical-based motion tracking systems. We propose using foot-mounted inertial measurement units (IMUs) as a solution as they enable unrestricted motion capture in any environment and without need for external references. In particular, this paper presents methods for estimating foot velocity and trajectory during stair running using foot-mounted IMUs...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29148136/effects-of-sensitive-electrical-stimulation-based-somatosensory-cueing-in-parkinson-s-disease-gait-and-freezing-of-gait-assessment
#5
Benoît Sijobert, Christine Azevedo, David Andreu, Claudia Verna, Christian Geny
This study aims to investigate the effect of a somatosensory cueing on gait disorders in subjects with Parkinson's disease (PD). After having performed stepping in place and timed up and go assessing tasks, 13 participants with PD were equipped with an electrical stimulator and an inertial measurement unit (IMU) located under the lateral malleolus on the sagittal plane. Electrodes were positioned under the arch of the foot and electrical stimulation (ES) parameters (five 500 µs/phase charge-balanced biphasic pulses delivered at 200 Hz, repeated four times at 10 Hz) adjusted to deliver a sensitive signal...
November 2017: Artificial Organs
https://www.readbyqxmd.com/read/29145504/quantifying-performance-on-an-outdoor-agility-drill-using-foot-mounted-inertial-measurement-units
#6
Antonia M Zaferiou, Lauro Ojeda, Stephen M Cain, Rachel V Vitali, Steven P Davidson, Leia Stirling, Noel C Perkins
Running agility is required for many sports and other physical tasks that demand rapid changes in body direction. Quantifying agility skill remains a challenge because measuring rapid changes of direction and quantifying agility skill from those measurements are difficult to do in ways that replicate real task/game play situations. The objectives of this study were to define and to measure agility performance for a (five-cone) agility drill used within a military obstacle course using data harvested from two foot-mounted inertial measurement units (IMUs)...
2017: PloS One
https://www.readbyqxmd.com/read/29141114/ph-ultrasound-dual-responsive-gas-generator-for-ultrasound-imaging-guided-therapeutic-inertial-cavitation-and-sonodynamic-therapy
#7
Qianhua Feng, Wanxia Zhang, Xuemei Yang, Yuzhen Li, Yongwei Hao, Hongling Zhang, Lin Hou, Zhenzhong Zhang
Herein, a pH/ultrasound dual-responsive gas generator is reported, which is based on mesoporous calcium carbonate (MCC) nanoparticles by loading sonosensitizer (hematoporphyrin monomethyl ether (HMME)) and modifying surface hyaluronic acid (HA). After pinpointing tumor regions with prominent targeting efficiency, HMME/MCC-HA decomposes instantaneously under the cotriggering of tumoral inherent acidic condition and ultrasound (US) irradiation, concurrently accompanying with CO2 generation and HMME release with spatial/temporal resolution...
November 15, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29137770/numerical-investigation-of-the-inertial-cavitation-threshold-under-multi-frequency-ultrasound
#8
Dingjie Suo, Bala Govind, Shengqi Zhang, Yun Jing
Through the introduction of multi-frequency sonication in High Intensity Focused Ultrasound (HIFU), enhancement of efficiency has been noted in several applications including thrombolysis, tissue ablation, sonochemistry, and sonoluminescence. One key experimental observation is that multi-frequency ultrasound can help lower the inertial cavitation threshold, thereby improving the power efficiency. However, this has not been well corroborated by the theory. In this paper, a numerical investigation on the inertial cavitation threshold of microbubbles (MBs) under multi-frequency ultrasound irradiation is conducted...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29135966/monocular-visual-inertial-slam-continuous-preintegration-and-reliable-initialization
#9
Yi Liu, Zhong Chen, Wenjuan Zheng, Hao Wang, Jianguo Liu
In this paper, we propose a new visual-inertial Simultaneous Localization and Mapping (SLAM) algorithm. With the tightly coupled sensor fusion of a global shutter monocular camera and a low-cost Inertial Measurement Unit (IMU), this algorithm is able to achieve robust and real-time estimates of the sensor poses in unknown environment. To address the real-time visual-inertial fusion problem, we present a parallel framework with a novel IMU initialization method. Our algorithm also benefits from the novel IMU factor, the continuous preintegration method, the vision factor of directional error, the separability trick and the robust initialization criterion which can efficiently output reliable estimates in real-time on modern Central Processing Unit (CPU)...
November 14, 2017: Sensors
https://www.readbyqxmd.com/read/29134944/distinct-spatial-coordinate-of-visual-and-vestibular-heading-signals-in-macaque-fefsem-and-mstd
#10
Lihua Yang, Yong Gu
Precise heading estimate requires integration of visual optic flow and vestibular inertial motion originating from distinct spatial coordinates (eye- and head-centered, respectively). To explore whether the two heading signals may share a common reference frame along the hierarchy of cortical stages, we explored two multisensory areas in macaques: the smooth pursuit area of the frontal eye field (FEFsem) closer to the motor side, and the dorsal portion of medial superior temporal area (MSTd) closer to the sensory side...
November 14, 2017: ELife
https://www.readbyqxmd.com/read/29133392/closed-loop-control-of-targeted-ultrasound-drug-delivery-across-the-blood-brain-tumor-barriers-in-a-rat-glioma-model
#11
Tao Sun, Yongzhi Zhang, Chanikarn Power, Phillip M Alexander, Jonathan T Sutton, Muna Aryal, Natalia Vykhodtseva, Eric L Miller, Nathan J McDannold
Cavitation-facilitated microbubble-mediated focused ultrasound therapy is a promising method of drug delivery across the blood-brain barrier (BBB) for treating many neurological disorders. Unlike ultrasound thermal therapies, during which magnetic resonance thermometry can serve as a reliable treatment control modality, real-time control of modulated BBB disruption with undetectable vascular damage remains a challenge. Here a closed-loop cavitation controlling paradigm that sustains stable cavitation while suppressing inertial cavitation behavior was designed and validated using a dual-transducer system operating at the clinically relevant ultrasound frequency of 274...
November 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29132727/speed-profiles-in-wheelchair-court-sports-comparison-of-two-methods-for-measuring-wheelchair-mobility-performance
#12
R M A van der Slikke, B S Mason, M A M Berger, V L Goosey-Tolfrey
Wheelchair mobility performance is an important aspect in most wheelchair court sports, commonly measured with an indoor tracking system or wheelchair bound inertial sensors. Both methods provide key wheelchair mobility performance outcomes regarding speed. In this study, we compared speed profiles of both methods to gain insight into the level of agreement, for recommendations regarding future performance measurement. Data were obtained from 5 male highly trained wheelchair basketball players during match play...
November 10, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29129832/multiphoton-minimal-inertia-scanning-for-fast-acquisition-of-neural-activity-signals
#13
Renaud Schuck, Mary Ann Go, Stefania Garasto, Stephanie Reynolds, Pier Luigi Dragotti, Simon Schultz
OBJECTIVE: Multi-photon laser scanning microscopy provides a powerful tool for monitoring the spatiotemporal dynamics of neural circuit activity. It is, however, intrinsically a point scanning technique. Standard raster scanning enables imaging at subcellular resolution; however, acquisition rates are limited by the size of the field of view to be scanned. Recently developed scanning strategies such as Travelling Salesman Scanning (TSS) have been developed to maximize cellular sampling rate by scanning only select regions in the field of view corresponding to locations of interest such as somata...
November 13, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29128703/new-results-on-global-exponential-dissipativity-analysis-of-memristive-inertial-neural-networks-with-distributed-time-varying-delays
#14
Guodong Zhang, Zhigang Zeng, Junhao Hu
This paper is concerned with the global exponential dissipativity of memristive inertial neural networks with discrete and distributed time-varying delays. By constructing appropriate Lyapunov-Krasovskii functionals, some new sufficient conditions ensuring global exponential dissipativity of memristive inertial neural networks are derived. Moreover, the globally exponential attractive sets and positive invariant sets are also presented here. In addition, the new proposed results here complement and extend the earlier publications on conventional or memristive neural network dynamical systems...
November 9, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/29127707/acoustic-characterization-and-enhanced-ultrasound-imaging-of-long-circulating-lipid-coated-microbubbles
#15
Hongbo Li, Yanye Yang, Meimei Zhang, Liping Yin, Juan Tu, Xiasheng Guo, Dong Zhang
OBJECTIVES: A long-circulating lipid-coated ultrasound (US) contrast agent was fabricated to achieve a longer wash-out time and gain more resistance against higher-mechanical index sonication. Systemic physical, acoustic, and in vivo imaging experiments were performed to better understand the underlying mechanism enabling the improvement of contrast agent performance by adjusting the physical and acoustic properties of contrast agent microbubbles. METHODS: By simply altering the gas core, a kind of US contrast agent microbubble was synthesized with a similar lipid-coating shell as SonoVue microbubbles (Bracco SpA, Milan, Italy) to achieve a longer wash-out time and higher inertial cavitation threshold...
November 11, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29127653/development-of-a-3d-workspace-shoulder-assessment-tool-incorporating-electromyography-and-an-inertial-measurement-unit-a-preliminary-study
#16
Navid Aslani, Siamak Noroozi, Philip Davenport, Richard Hartley, Mihai Dupac, Philip Sewell
Traditional shoulder range of movement (ROM) measurement tools suffer from inaccuracy or from long experimental setup times. Recently, it has been demonstrated that relatively low-cost wearable inertial measurement unit (IMU) sensors can overcome many of the limitations of traditional motion tracking systems. The aim of this study is to develop and evaluate a single IMU combined with an electromyography (EMG) sensor to monitor the 3D reachable workspace with simultaneous measurement of deltoid muscle activity across the shoulder ROM...
November 11, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29125534/full-body-locomotion-reconstruction-of-virtual-characters-using-a-single-inertial-measurement-unit
#17
Christos Mousas
This paper presents a method of reconstructing full-body locomotion sequences for virtual characters in real-time, using data from a single inertial measurement unit (IMU). This process can be characterized by its difficulty because of the need to reconstruct a high number of degrees of freedom (DOFs) from a very low number of DOFs. To solve such a complex problem, the presented method is divided into several steps. The user's full-body locomotion and the IMU's data are recorded simultaneously. Then, the data is preprocessed in such a way that would be handled more efficiently...
November 10, 2017: Sensors
https://www.readbyqxmd.com/read/29122186/accuracy-of-angular-displacements-and-velocities-from-inertial-based-inclinometers
#18
Howard Chen, Mark C Schall, Nathan Fethke
The objective of this study was to evaluate the accuracy of various sensor fusion algorithms for measuring upper arm elevation relative to gravity (i.e., angular displacement and velocity summary measures) across different motion speeds. Thirteen participants completed a cyclic, short duration, arm-intensive work task that involved transfering wooden dowels at three work rates (slow, medium, fast). Angular displacement and velocity measurements of upper arm elevation were simultaneously measured using an inertial measurement unit (IMU) and an optical motion capture (OMC) system...
February 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29119862/static-and-dynamic-accuracy-of-a-magnetic-inertial-measurement-unit-used-to-provide-racket-swing-kinematics
#19
Benjamin Kane Williams, Ross H Sanders, Joong Hyun Ryu, Pitre C Bourdon, Philip Graham-Smith, Peter J Sinclair
Magnetic-inertial measurement units (MIMUs) are becoming more prevalent in sports biomechanics and may be a viable tool to evaluate kinematic parameters. This study examined the accuracy of a MIMU to estimate orientation angles under static conditions and dynamically from a squash racket during a forehand drive shot. A MIMU was mounted onto a goniometer and moved through 0-90°, with static data collected at 10° increments during 10 repetitions of all three axes. Typical error analyses showed the MIMU to be very reliable (TE ≤ 0...
November 9, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29117143/a-smartphone-step-counter-using-imu-and-magnetometer-for-navigation-and-health-monitoring-applications
#20
Maan Khedr, Nasser El-Sheimy
The growing market of smart devices make them appealing for various applications. Motion tracking can be achieved using such devices, and is important for various applications such as navigation, search and rescue, health monitoring, and quality of life-style assessment. Step detection is a crucial task that affects the accuracy and quality of such applications. In this paper, a new step detection technique is proposed, which can be used for step counting and activity monitoring for health applications as well as part of a Pedestrian Dead Reckoning (PDR) system...
November 8, 2017: Sensors
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