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https://www.readbyqxmd.com/read/28629191/a-new-filtering-and-smoothing-algorithm-for-railway-track-surveying-based-on-landmark-and-imu-odometer
#1
Qingan Jiang, Wenqi Wu, Mingming Jiang, Yun Li
High-accuracy railway track surveying is essential for railway construction and maintenance. The traditional approaches based on total station equipment are not efficient enough since high precision surveying frequently needs static measurements. This paper proposes a new filtering and smoothing algorithm based on the IMU/odometer and landmarks integration for the railway track surveying. In order to overcome the difficulty of estimating too many error parameters with too few landmark observations, a new model with completely observable error states is established by combining error terms of the system...
June 19, 2017: Sensors
https://www.readbyqxmd.com/read/28621709/an-unobtrusive-fall-detection-and-alerting-system-based-on-kalman-filter-and-bayes-network-classifier
#2
Jian He, Shuang Bai, Xiaoyi Wang
Falls are one of the main health risks among the elderly. A fall detection system based on inertial sensors can automatically detect fall event and alert a caregiver for immediate assistance, so as to reduce injuries causing by falls. Nevertheless, most inertial sensor-based fall detection technologies have focused on the accuracy of detection while neglecting quantization noise caused by inertial sensor. In this paper, an activity model based on tri-axial acceleration and gyroscope is proposed, and the difference between activities of daily living (ADLs) and falls is analyzed...
June 16, 2017: Sensors
https://www.readbyqxmd.com/read/28615742/restarting-iterative-projection-methods-for-hermitian-nonlinear-eigenvalue-problems-with-minmax-property
#3
Marta M Betcke, Heinrich Voss
In this work we present a new restart technique for iterative projection methods for nonlinear eigenvalue problems admitting minmax characterization of their eigenvalues. Our technique makes use of the minmax induced local enumeration of the eigenvalues in the inner iteration. In contrast to global numbering which requires including all the previously computed eigenvectors in the search subspace, the proposed local numbering only requires a presence of one eigenvector in the search subspace. This effectively eliminates the search subspace growth and therewith the super-linear increase of the computational costs if a large number of eigenvalues or eigenvalues in the interior of the spectrum are to be computed...
2017: Numer Math (Heidelb)
https://www.readbyqxmd.com/read/28612890/technology-in-rehabilitation-comparing-personalised-and-global-classification-methodologies-in-evaluating-the-squat-exercise-with-wearable-imus
#4
Martin A O'Reilly, Darragh Whelan, Tomás E Ward, Eamonn Delahunt, Brian Caulfield
BACKGROUND: The barbell squat is a popularly used lower limb rehabilitation exercise. It is also an integral exercise in injury risk screening protocols. To date athlete/patient technique has been assessed using expensive laboratory equipment or subjective clinical judgement; both of which are not without shortcomings. Inertial measurement units (IMUs) may offer a low cost solution for the objective evaluation of athlete/patient technique. However, it is not yet known if global classification techniques are effective in identifying naturally occurring, minor deviations in barbell squat technique...
June 14, 2017: Methods of Information in Medicine
https://www.readbyqxmd.com/read/28607801/quantitative-analysis-of-motor-status-in-parkinson-s-disease-using-wearable-devices-from-methodological-considerations-to-problems-in-clinical-applications
#5
REVIEW
Masahiko Suzuki, Hiroshi Mitoma, Mitsuru Yoneyama
Long-term and objective monitoring is necessary for full assessment of the condition of patients with Parkinson's disease (PD). Recent advances in biotechnology have seen the development of various types of wearable (body-worn) sensor systems. By using accelerometers and gyroscopes, these devices can quantify motor abnormalities, including decreased activity and gait disturbances, as well as nonmotor signs, such as sleep disturbances and autonomic dysfunctions in PD. This review discusses methodological problems inherent in wearable devices...
2017: Parkinson's Disease
https://www.readbyqxmd.com/read/28600261/haptic-orientation-guidance-using-two-parallel-double-gimbal-control-moment-gyroscopes
#6
Julie Walker, Heather Culbertson, Michael Raitor, Allison Okamura
This paper presents a system of two double-gimbal control moment gyroscopes (CMGs) for providing ungrounded kinesthetic haptic feedback. By spinning a second flywheel opposite the first, and rotating them through opposite trajectories, undesired gyroscopic effects can be eliminated, isolating a single torque axis. This produces a moment pulse proportional to the flywheel spin speed and rotation speed. Rotating the CMG gimbals quickly in one direction, then resetting them more slowly generates repeated torque pulses indicating a clear direction cue...
June 7, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28598610/octahedral-gyroscope-like-molecules-consisting-of-rhenium-rotators-within-cage-like-dibridgehead-diphosphine-stators-syntheses-substitution-reactions-structures-and-dynamic-properties
#7
Gisela D Hess, Tobias Fiedler, Frank Hampel, John A Gladysz
Reactions of Re(CO)5(X) (X = Cl, Br) or [Re2(CO)4(NO)2(μ-Cl)2(Cl)2] and the phosphines P((CH2)mCH═CH2)3 (m = 6, a; 7, b; 8, c) give mer,trans-Re(CO)3(X)(P((CH2)mCH═CH2)3)2 (53-95%) or cis,trans-Re(CO) (NO) (Cl)2(P((CH2)6CH═CH2)3)2 (57%), respectively. Additions of Grubbs' catalyst (5-10 mol %, 0.0010-0.0012 M) and subsequent hydrogenations (PtO2, ≤5 bar) yield the gyroscope-like complexes mer,trans-R e(CO)3(X)(P((CH2)n)3 P) (n = 2m + 2; X = Cl, 7a,c; Br, 8a,c; 18-61%) or cis,trans-R e(CO)(NO)(Cl)2(P((CH2)14)3 P) (14%), respectively, and/or the isomers mer,trans-R e(CO)3(X)( P(CH2)n-1 CH2)((CH2)n)( P(CH2)n-1 CH2) (X = Cl, 7'a-c; Br, 8'b; 6-27%)...
June 9, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28595865/profiling-of-translational-and-rotational-head-accelerations-in-youth-bmx-with-and-without-neck-brace
#8
Howard T Hurst, Lee Rylands, Stephen Atkins, Kevin Enright, Simon J Roberts
OBJECTIVES: To investigate the influence of BMX helmets and neck braces on translational and rotational accelerations in youth riders. DESIGN: Mixed model, repeated measure and correlation. METHODS: Twenty three competitive youth BMX riders classified by age group (6-9 years, 10-13 years and 14-18 years) completed 6 laps of an indoor BMX track at race pace, 3 laps without a neck brace (NB) and 3 without brace (WB). A triaxial accelerometer with gyroscope was placed behind the right ear to determine the mean number of accelerations, translational and rotational, of the head between conditions and by age group...
May 25, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28582975/crystalline-supramolecular-gyroscope-with-a-water-molecule-as-an-ultrasmall-polar-rotator-modulated-by-charge-assisted-hydrogen-bonds
#9
Wang Li, Chun-Ting He, Ying Zeng, Cheng-Min Ji, Zi-Yi Du, Wei-Xiong Zhang, Xiao-Ming Chen
A new strategy for the construction of crystalline molecular rotors is presented. The combination of a conformation-modifiable macrocyclic host and two cooperative guests affords one supramolecular gyroscope-like compound, (t-BuNH3)(18-crown-6)[ZnCl3(H2O)], in which the coordinated water molecule functions as an ultrasmall polar rotator, revealed by its significant dielectric relaxation and the molecular dynamics simulations. In addition, such a compound can reversibly undergo a polar-to-polar phase transition triggered by the changed conformation of the 18-crown-6 host, leading to a switchable on/off rotation of water molecule, well controlled by strength and direction of charge-assisted hydrogen bonds...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28578138/static-and-dynamic-validation-of-inertial-measurement-units
#10
Leah Taylor, Emily Miller, Kenton R Kaufman
Optical motion capture systems are used to assess human motion. While these systems provide a reliable analysis, they limit collection to a laboratory based setting. Devices such as Inertial Measurement Units (IMUs) have been developed as alternative tools. Commercially available IMUs are utilized for a variety of applications; however limited work has been done to determine the reliability of these devices. The objective of this study was to assess the accuracy and precision of a commercially available IMU, containing tri-axial accelerometers, gyroscopes, and magnetometers, under controlled static and dynamic conditions...
May 26, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28571428/deep-cooling-of-optically-trapped-atoms-implemented-by-magnetic-levitation-without-transverse-confinement
#11
Chen Li, Tianwei Zhou, Yueyang Zhai, Jinggang Xiang, Tian Luan, Qi Huang, Shifeng Yang, Wei Xiong, Xuzong Chen
We report a setup for the deep cooling of atoms in an optical trap. The deep cooling is implemented by eliminating the influence of gravity using specially constructed magnetic coils. Compared to the conventional method of generating a magnetic levitating force, the lower trap frequency achieved in our setup provides a lower limit of temperature and more freedoms to Bose gases with a simpler solution. A final temperature as low as ∼6nK is achieved in the optical trap, and the atomic density is decreased by nearly two orders of magnitude during the second stage of evaporative cooling...
May 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28546137/activity-recognition-for-persons-with-stroke-using-mobile-phone-technology-toward-improved-performance-in-a-home-setting
#12
Megan K O'Brien, Nicholas Shawen, Chaithanya K Mummidisetty, Saninder Kaur, Xiao Bo, Christian Poellabauer, Konrad Kording, Arun Jayaraman
BACKGROUND: Smartphones contain sensors that measure movement-related data, making them promising tools for monitoring physical activity after a stroke. Activity recognition (AR) systems are typically trained on movement data from healthy individuals collected in a laboratory setting. However, movement patterns change after a stroke (eg, gait impairment), and activities may be performed differently at home than in a lab. Thus, it is important to validate AR for gait-impaired stroke patients in a home setting for accurate clinical predictions...
May 25, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28525311/telerehabilitation-of-patients-with-injuries-of-the-lower-extremities
#13
Andriy I Tsvyakh, Andriy J Hospodarskyy
INTRODUCTION: Timely access to orthopedic rehabilitation is an important problem for the Ukrainian healthcare system. The international orthopedic community aims to achieve the best possible outcome for patient care by modifying rehabilitation methods and using telemedicine technology. The theme of this article is to discuss the integration of telemedicine technology in the rehabilitation of patients with injuries of the lower extremities. MATERIALS AND METHODS: Consecutive patients were recruited over a 2-year period...
May 19, 2017: Telemedicine Journal and E-health: the Official Journal of the American Telemedicine Association
https://www.readbyqxmd.com/read/28479553/a-two-layer-method-for-sedentary-behaviors-classification-using-smartphone-and-bluetooth-beacons
#14
Jesús D Cerón, Diego M López, Christian Hofmann
BACKGROUND: Among the factors that outline the health of populations, person's lifestyle is the more important one. This work focuses on the caracterization and prevention of sedentary lifestyles. A sedentary behavior is defined as "any waking behavior characterized by an energy expenditure of 1.5 METs (Metabolic Equivalent) or less while in a sitting or reclining posture". OBJECTIVE: To propose a method for sedentary behaviors classification using a smartphone and Bluetooth beacons considering different types of classification models: personal, hybrid or impersonal...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28473582/miniaturizing-optical-gyroscopes
#15
Ian S Osborne
No abstract text is available yet for this article.
May 5, 2017: Science
https://www.readbyqxmd.com/read/28471376/analysis-of-the-damping-characteristics-of-cylindrical-resonators-influenced-by-piezoelectric-electrodes
#16
Jiangkun Sun, Yulie Wu, Xiang Xi, Yongmeng Zhang, Xuezhong Wu
The cylindrical resonator gyroscope (CRG) is a typical Coriolis vibratory gyroscope whose performance is mostly influenced by the damping characteristic of the cylindrical resonator. However, the tremendous damping influences caused by pasting piezoelectric electrodes on the gyroscope, which degrades the performance to a large extent, have rarely been studied. In this paper, the dynamical model is established to analyze various forms of energy consumption. In addition, a FE COMSOL model is also created to discuss the damping influences of several significant parameters of the adhesive layer and piezoelectric electrodes, respectively, and then explicit influence laws are obtained...
May 4, 2017: Sensors
https://www.readbyqxmd.com/read/28468288/a-lever-coupling-mechanism-in-dual-mass-micro-gyroscopes-for-improving-the-shock-resistance-along-the-driving-direction
#17
Yang Gao, Hongsheng Li, Libin Huang, Hui Sun
This paper presents the design and application of a lever coupling mechanism to improve the shock resistance of a dual-mass silicon micro-gyroscope with drive mode coupled along the driving direction without sacrificing the mechanical sensitivity. Firstly, the mechanical sensitivity and the shock response of the micro-gyroscope are theoretically analyzed. In the mechanical design, a novel lever coupling mechanism is proposed to change the modal order and to improve the frequency separation. The micro-gyroscope with the lever coupling mechanism optimizes the drive mode order, increasing the in-phase mode frequency to be much larger than the anti-phase one...
April 30, 2017: Sensors
https://www.readbyqxmd.com/read/28464447/cellular-internalization-of-rod-like-nanoparticles-with-various-surface-patterns-novel-entry-pathway-and-controllable-uptake-capacity
#18
Jiaxiao Xue, Zhou Guan, Jiaping Lin, Chunhua Cai, Wenjie Zhang, Xinquan Jiang
The cellular internalization of rod-like nanoparticles (NPs) is investigated in a combined experimental and simulation study. These rod-like nanoparticles with smooth, abacus-like (i.e., beads-on-wires), and helical surface patterns are prepared by the cooperative self-assembly of poly(γ-benzyl-l-glutamate)-block-poly(ethylene glycol) (PBLG-b-PEG) block copolymers and PBLG homopolymers. All three types of NPs can be internalized via endocytosis. Helical NPs exhibit the best endocytic efficacy, followed by smooth NPs and abacus-like NPs...
June 2017: Small
https://www.readbyqxmd.com/read/28463278/extracting-and-compensating-for-fog-vibration-error-based-on-improved-empirical-mode-decomposition-with-masking-signal
#19
Xiyuan Chen, Wei Wang
Vibration is an important error source in fiber-optic gyroscopes (FOGs), and the extraction and compensation of vibration signals are important ways to eliminate the error and improve the accuracy of FOG. To decompose the vibration signal better, a new algorithm based on empirical mode decomposition (EMD) with masking signal is proposed in this paper. The masking signal is a kind of sinusoidal signal, and the frequency and amplitude of the masking signal are selected using improved particle swarm optimization...
May 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28461901/technique-to-estimate-human-reaction-time-based-on-visual-perception
#20
Reza Abbasi-Kesbi, Hamidreza Memarzadeh-Tehran, M Jamal Deen
The design and implementation of a wearable system to estimate the human reaction time (HRT) to visual stimulus based on two identical wireless motion sensors are described. Each sensor incorporates a motion sensor (gyroscope), a processor and a transceiver operating at the industrial, scientific and medical frequency of 2.45 GHz. Relevant tests to estimate the HRT are performed in two different scenarios including simple and recognition tests for 90 pairs of measurements. The obtained results are compared with a computer-based system to determine the accuracy of the proposed system...
April 2017: Healthcare Technology Letters
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