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https://www.readbyqxmd.com/read/28943718/a-branch-and-bound-framework-for-unsupervised-common-event-discovery
#1
Wen-Sheng Chu, Fernando De la Torre, Jeffrey F Cohn, Daniel S Messinger
Event discovery aims to discover a temporal segment of interest, such as human behavior, actions or activities. Most approaches to event discovery within or between time series use supervised learning. This becomes problematic when some relevant event labels are unknown, are difficult to detect, or not all possible combinations of events have been anticipated. To overcome these problems, this paper explores Common Event Discovery (CED), a new problem that aims to discover common events of variable-length segments in an unsupervised manner...
July 2017: International Journal of Computer Vision
https://www.readbyqxmd.com/read/28943258/adaptation-of-feedforward-movement-control-is-abnormal-in-patients-with-cervical-dystonia-and-tremor
#2
Laura Avanzino, Andrea Ravaschio, Giovanna Lagravinese, Gaia Bonassi, Giovanni Abbruzzese, Elisa Pelosin
OBJECTIVE: It is under debate whether the cerebellum plays a role in dystonia pathophysiology and in the expression of clinical phenotypes. We investigated a typical cerebellar function (anticipatory movement control) in patients with cervical dystonia (CD) with and without tremor. METHODS: Twenty patients with CD, with and without tremor, and 17 healthy controls were required to catch balls of different load: 15 trials with a light ball, 25 trials with a heavy ball (adaptation) and 15 trials with a light ball (post-adaptation)...
September 9, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28941955/effect-of-arm-swinging-on-lumbar-spine-and-hip-joint-forces
#3
Lorenza Angelini, Philipp Damm, Thomas Zander, Rizwan Arshad, Francesca Di Puccio, Hendrik Schmidt
During level walking, arm swing plays a key role in improving dynamic stability. In vivo investigations with a telemeterized vertebral body replacement showed that spinal loads can be affected by differences in arm positions during sitting and standing. However, little is known about how arm swing could influence the lumbar spine and hip joint forces and motions during walking. The present study aims to provide better understanding of the contribution of the upper limbs to human gait, investigating ranges of motion and joint reaction forces...
September 14, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28940077/tethered-particle-motion-an-easy-technique-for-probing-dna-topology-and-interactions-with-transcription-factors
#4
Daniel T Kovari, Yan Yan, Laura Finzi, David Dunlap
Tethered Particle Motion (TPM) is a versatile in vitro technique for monitoring the conformations a linear macromolecule, such as DNA, can exhibit. The technique involves monitoring the diffusive motion of a particle anchored to a fixed point via the macromolecule of interest, which acts as a tether. In this chapter, we provide an overview of TPM, review the fundamental principles that determine the accuracy with which effective tether lengths can be used to distinguish different tether conformations, present software tools that assist in capturing and analyzing TPM data, and provide a protocol which uses TPM to characterize lac repressor-induced DNA looping...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28933710/elite-youth-soccer-players-physiological-responses-time-motion-characteristics-and-game-performance-in-4-vs-4-small-sided-games-the-influence-of-coach-feedback
#5
Mirko Brandes, Sebastian Elvers
Brandes, M and Elvers, S. Elite youth soccer players' physiological responses, time-motion characteristics, and game performance in 4 vs. 4 small-sided games: the influence of coach feedback. J Strength Cond Res 31(10): 2652-2658, 2017-The purpose of this study was to determine the impact of mild vs. strongly pushed coach feedback on the physiological response, ratio of perceived exertion (RPE), and time-motion characteristics in soccer training with small-sided games (SSGs). Sixteen elite youth soccer players (aged 17...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28933560/unintentional-nontraffic-injury-and-fatal-events-threats-to-children-in-and-around-vehicles
#6
Mark R Zonfrillo, Mackenzie L Ramsay, Janette E Fennell, Amber Rollins
Objective There have been substantial reductions in motor vehicle crash-related child fatalities due to advances in legislation, public safety campaigns, and engineering. Less is known about nontraffic injuries and fatalities to children in and around motor vehicles. The objective of this study was to describe the frequency of various nontraffic incidents, injuries, and fatalities to children using a unique surveillance system and database. Methods Instances of nontraffic injuries and fatalities in the United States to children 0-14 years were tracked from January 1990 - December 2014 using a compilation of sources including media reports, individual accounts from families of affected children, medical examiner reports, police reports, child death review teams, coroner reports, medical professionals, legal professionals, and other various modes of publication...
September 21, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28932653/a-bio-inspired-approach-for-the-design-of-a-multifunctional-robotic-end-effector-customized-for-automated-maintenance-of-a-reconfigurable-vibrating-screen
#7
O A Makinde, K Mpofu, R Vrabic, B I Ramatsetse
The development of a robotic-driven maintenance solution capable of automatically maintaining reconfigurable vibrating screen (RVS) machine when utilized in dangerous and hazardous underground mining environment has called for the design of a multifunctional robotic end-effector capable of carrying out all the maintenance tasks on the RVS machine. In view of this, the paper presents a bio-inspired approach which unfolds the design of a novel multifunctional robotic end-effector embedded with mechanical and control mechanisms capable of automatically maintaining the RVS machine...
2017: Robotics and Biomimetics
https://www.readbyqxmd.com/read/28929927/ankle-taping-can-reduce-external-ankle-joint-moments-during-drop-landings-on-a-tilted-surface
#8
Nahoko Sato, Hiroyuki Nunome, Luke S Hopper, Yasuo Ikegami
Ankle taping is commonly used to prevent ankle sprains. However, kinematic assessments investigating the biomechanical effects of ankle taping have provided inconclusive results. This study aimed to determine the effect of ankle taping on the external ankle joint moments during a drop landing on a tilted surface at 25°. Twenty-five participants performed landings on a tilted force platform that caused ankle inversion with and without ankle taping. Landing kinematics were captured using a motion capture system...
September 20, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28929766/converting-vertical-vibration-of-anisotropic-ratchet-conveyors-into-horizontal-droplet-motion
#9
Yan Dong, Hal Holmes, Karl F Böhringer
An anisotropic ratchet conveyor is an asymmetric, periodic, micropatterned surface that propels droplets when vibrated with a sinusoidal signal at certain frequencies and amplitudes. For each input frequency, there is a threshold amplitude beyond which the droplet starts to move. In this paper, we study the parameters that initiate droplet motion and the relationship between the input frequency and threshold amplitude among droplets with different volume, density, viscosity and surface tension. Through this investigation we demonstrate how non-dimensionalization reveals consistent behavior for droplets of different volumes...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28927995/measuring-system-for-an-attitude-angle-of-a-denture-using-an-inertial-measurement-unit
#10
Toshiaki Sekita, Syuhei Takeuchi, Syunsuke Minakuchi
PURPOSE: The aim of this study was to assemble and verify a measuring system for 3-D movements (attitude angle) of the denture during function. METHODS: For the calibration test, the sensor was fixed at the center of the rotary table. Operation and stopping of the rotary table were repeated 8 times, and the direction of rotation was reversed in the middle. The amount of rotation was 1.2 and 2.4°. As a pilot clinical trial, the attitude angles of three upper complete dentures during tapping were measured by this system...
September 15, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28927643/a-combined-kinematic-and-kinetic-analysis-at-the-residuum-socket-interface-of-a-knee-disarticulation-amputee
#11
Jinghua Tang, Michael McGrath, Nick Hale, Liudi Jiang, Dan Bader, Piotr Laszczak, David Moser, Saeed Zahedi
The bespoke interface between a lower limb residuum and a prosthetic socket is critical for an amputee's comfort and overall rehabilitation outcomes. Analysis of interface kinematics and kinetics is important to gain full understanding of the interface biomechanics, which could aid clinical socket fit, rehabilitation and amputee care. This pilot study aims to investigate the dynamic correlation between kinematic movement and kinetic stresses at the interface during walking tests on different terrains. One male, knee disarticulation amputee participated in the study...
September 15, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28924915/multiscale-modeling-of-diffusion-in-a-crowded-environment
#12
Lina Meinecke
We present a multiscale approach to model diffusion in a crowded environment and its effect on the reaction rates. Diffusion in biological systems is often modeled by a discrete space jump process in order to capture the inherent noise of biological systems, which becomes important in the low copy number regime. To model diffusion in the crowded cell environment efficiently, we compute the jump rates in this mesoscopic model from local first exit times, which account for the microscopic positions of the crowding molecules, while the diffusing molecules jump on a coarser Cartesian grid...
September 18, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28922314/temporal-indices-of-ankle-clonus-and-relationship-to-electrophysiologic-and-clinical-measures-in-persons-with-spinal-cord-injury
#13
Kathleen J Manella, Kathryn E Roach, Edelle C Field-Fote
BACKGROUND AND PURPOSE: Clonus arising from plantar flexor hyperreflexia is a phenomenon that is commonly observed in persons with spastic hypertonia. We assessed the temporal components of a biomechanical measure to quantify ankle clonus, and validated these in persons with spasticity due to spinal cord injury. METHODS: In 40 individuals with chronic (>1 year) spinal cord injury, we elicited ankle clonus using a standardized mechanical perturbation (drop test)...
October 2017: Journal of Neurologic Physical Therapy: JNPT
https://www.readbyqxmd.com/read/28922169/app-based-bradykinesia-tasks-for-clinic-and-home-assessment-in-parkinson-s-disease-reliability-and-responsiveness
#14
Dustin A Heldman, Enrique Urrea-Mendoza, Lilia C Lovera, David A Schmerler, Xiomara Garcia, Mohammad E Mohammad, Maria Catalina U McFarlane, Joseph P Giuffrida, Alberto J Espay, Hubert H Fernandez
BACKGROUND: Clinical rating of bradykinesia in Parkinson disease (PD) is challenging as it must combine several movement features into a single score. Additionally, in-clinic assessment cannot capture fluctuations throughout the day. OBJECTIVE: To evaluate the reliability and responsiveness of a motion sensor-based tablet app for objective bradykinesia assessment in clinic and at home as compared to clinical ratings. METHODS: Thirty-two PD patients treated with subthalamic deep brain stimulation (DBS) were outfitted with a motion sensor on the index finger of the more affected hand to perform two repetitions of finger-tapping, hand opening-closing, and arm pronation-supination tasks with DBS on and 10, 20, and 30 minutes after turning DBS off...
September 11, 2017: Journal of Parkinson's Disease
https://www.readbyqxmd.com/read/28920611/an-efficient-algorithm-for-extracting-the-magnitude-of-the-measurement-error-for-fractional-dynamics
#15
G Sikora, E Kepten, A Weron, M Balcerek, K Burnecki
Modern live-imaging fluorescent microscopy techniques following the stochastic motion of labeled tracer particles, i.e. single particle tracking (SPT) experiments, have uncovered significant deviations from the laws of Brownian motion in a variety of biological systems. Accurately characterizing the anomalous diffusion for SPT experiments has become a central issue in biophysics. However, measurement errors raise difficulty in the analysis of single trajectories. In this paper, we introduce a novel surface calibration method based on a fractionally integrated moving average (FIMA) process as an effective tool for extracting both the magnitude of the measurement error and the anomalous exponent for autocorrelated processes of various origins...
September 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28920130/reasons-and-factors-behind-post-total-knee-arthroplasty-dissatisfaction-in-an-asian-population
#16
Yilun Huang, Merrill Lee, Hwei Chi Chong, Yilin Ning, Ngai Nung Lo, Seng Jin Yeo
INTRODUCTION: Up to 20% of patients who underwent total knee arthroplasty (TKA) reported dissatisfaction with surgical outcome. Despite the multiple studies looking into the factors contributing to patients' dissatisfaction, little research has been done to examine the subjective reasons and complaints patients have post-arthroplasty. This study aimed to look at an Asian patient population which underwent TKA and examine the factors contributing to patient dissatisfaction and the reasons they were dissatisfied with their surgery...
August 2017: Annals of the Academy of Medicine, Singapore
https://www.readbyqxmd.com/read/28919168/contribution-of-interaction-torques-during-dart-throwing-differences-between-novices-and-experts
#17
Nasser Rezzoug, Clint Hansen, Philippe Gorce, Brice Isableu
We examined if experts and novices show different utilization of the torque components impulses during dart throwing. Participants threw darts continuously at a dartboard aiming for the centre (target bull's eye). The upper-limb joint torque impulses were obtained through inverse dynamics with anthropometric and motion capture data as input. Depending on the joint degree of freedom (DOF) and movement phase (acceleration and follow-through), three main strategies of net torque (NET) impulse generation through joint muscle (MUS) and interaction (INT) torque impulses were highlighted...
September 14, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28917952/identification-of-potential-allosteric-communication-pathways-between-functional-sites-of-the-bacterial-ribosome-by-graph-and-elastic-network-models
#18
Pelin Guzel, Ozge Kurkcuoglu
BACKGROUND: Accumulated evidence indicates that bacterial ribosome employs allostery throughout its structure for protein synthesis. The nature of the allosteric communication between remote functional sites remains unclear, but the contact topology and dynamics of residues may play role in transmission of a perturbation to distant sites. METHODS/RESULTS: We employ two computationally efficient approaches - graph and elastic network modeling to gain insights about the allosteric communication in ribosome...
September 13, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28913728/shoulder-strengthening-exercises-adapted-to-specific-shoulder-pathologies-can-be-selected-using-new-simulation-techniques-a-pilot-study
#19
Caecilia Charbonnier, Alexandre Lädermann, Bart Kevelham, Sylvain Chagué, Pierre Hoffmeyer, Nicolas Holzer
PURPOSE: Shoulder strength training exercises represent a major component of rehabilitation protocols designed for conservative or postsurgical management of shoulder pathologies. Numerous methods are described for exercising each shoulder muscle or muscle group. Limited information is available to assess potential deleterious effects of individual methods with respect to specific shoulder pathologies. Thus, the goal of this pilot study was to use a patient-specific 3D measurement technique coupling medical imaging and optical motion capture for evaluation of a set of shoulder strength training exercises regarding glenohumeral, labral and subacromial compression, as well as elongation of the rotator cuff muscles...
September 14, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28912155/visual-motion-discrimination-by-propagating-patterns-in-primate-cerebral-cortex
#20
Rory Townsend, Selina S Solomon, Paul R Martin, Samuel G Solomon, Pulin Gong
Visual stimuli can evoke waves of neural activity that propagate across the surface of visual cortical areas. The relevance of these waves for visual processing is unknown. Here we measured the phase and amplitude of local field potentials (LFPs) in electrode array recordings from motion-processing medial temporal area (MT) of anesthetized male marmosets. Animals viewed grating or dot-field stimuli drifting in different directions. We found that on individual trials, the direction of LFP wave propagation is sensitive to the direction of stimulus motion...
September 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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