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Journal articles on the topic 'Speed motion'

Author: Grafiati

Published: 3 May 2022

Last updated: 30 July 2025

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1

Sato, T., and K. Maruya. "Local motion speed affects the perceived speed of motion-defined motion." Journal of Vision 5, no. 8 (2005): 930. http://dx.doi.org/10.1167/5.8.930.

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2

Norman, Hideko F., J. Farley Norman, James T. Todd, and Delwin T. Lindsey. "Spatial Interactions in Perceived Speed." Perception 25, no. 7 (1996): 815–30. http://dx.doi.org/10.1068/p250815.

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Previous research has shown that the perception of motion within a local region is influenced by other motions within neighboring areas (eg induced motion). Here, a study is reported of the perceived speed of dots moving within a circular target region, which was surrounded by other motions within a larger surrounding area. The perceived speed of the central dots was found to be fastest when the surround was stationary; it became slower as the speed of motion in the surround was increased. This decrease in the perceived target speed with increases in surround velocity occurred regardless of wh

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3

Hatzakis, Iason, and Paul D. Sclavounos. "Active Motion Control of High-Speed Hydrofoil Vessels by State-Space Methods." Journal of Ship Research 50, no. 01 (2006): 49–62. http://dx.doi.org/10.5957/jsr.2006.50.1.49.

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Hydrofoil ships cruising at high speeds often operate in rough weather conditions and hence experience uncomfortable or even unsafe motions without the use of some form of motion control. The research described here concerns an active motion control mechanism for high-speed hydrofoil vessels, aiming at the significant reduction of the vessel motions in regular and random waves. The seakeeping equations of motion are cast into a linear state-space form leading to a linear-quadratic optimal controller shown to attenuate the vessel motion responses significantly. The deterministic control laws de

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4

Priebe, Nicholas J., and Stephen G. Lisberger. "Constraints on the Source of Short-Term Motion Adaptation in Macaque Area MT. II. Tuning of Neural Circuit Mechanisms." Journal of Neurophysiology 88, no. 1 (2002): 370–82. http://dx.doi.org/10.1152/jn.2002.88.1.370.

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Neurons in area MT, a motion-sensitive area of extrastriate cortex, respond to a step of target velocity with a transient-sustained firing pattern. The transition from a high initial firing rate to a lower sustained rate occurs over a time course of 20–80 ms and is considered a form of short-term adaptation. In the present paper, we compared the tuning of the adaptation to the neuron's tuning to direction and speed. The tuning of adaptation was measured with a condition/test paradigm in which a testing motion of the preferred direction and speed of the neuron under study was preceded by a cond

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5

Hussain, Yossra, and Ahmed A. Shkara. "Speed up Eulerian Video Motion Magnification." Kurdistan Journal of Applied Research 2, no. 3 (2017): 14–17. http://dx.doi.org/10.24017/science.2017.3.14.

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A standard video can have small video motions that are difficult to see by naked eye because of it limited sensitivity. These hidden signals variation may have highly useful information that can be used in variety of applications fields such as healthcare, biology, mechanical engineering, civil engineering, military and security. Eulerian Video Motion Magnification is a system used to detect and amplified tiny motions in video. This system have a problem with processing time, it consumes too long time to complete the spatial _ temporal analyzing. This paper, proposes a modified approach to Spe

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6

Verstraten, Frans A. J., Maarten J. van der Smagt, and Wim A. van de Grind. "Aftereffect of High-Speed Motion." Perception 27, no. 9 (1998): 1055–66. http://dx.doi.org/10.1068/p271055.

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A visual illusion known as the motion aftereffect is considered to be the perceptual manifestation of motion sensors that are recovering from adaptation. This aftereffect can be obtained for a specific range of adaptation speeds with its magnitude generally peaking for speeds around 3 deg s−1. The classic motion aftereffect is usually measured with a static test pattern. Here, we measured the magnitude of the motion aftereffect for a large range of velocities covering also higher speeds, using both static and dynamic test patterns. The results suggest that at least two (sub)populations of moti

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7

Krekelberg, Bart, and Richard J. A. van Wezel. "Neural mechanisms of speed perception: transparent motion." Journal of Neurophysiology 110, no. 9 (2013): 2007–18. http://dx.doi.org/10.1152/jn.00333.2013.

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Visual motion on the macaque retina is processed by direction- and speed-selective neurons in extrastriate middle temporal cortex (MT). There is strong evidence for a link between the activity of these neurons and direction perception. However, there is conflicting evidence for a link between speed selectivity of MT neurons and speed perception. Here we study this relationship by using a strong perceptual illusion in speed perception: when two transparently superimposed dot patterns move in opposite directions, their apparent speed is much larger than the perceived speed of a single pattern mo

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8

McIntyre, S., I. Birznieks, R. M. Vickery, A. O. Holcombe, and T. Seizova-Cajic. "The tactile motion aftereffect suggests an intensive code for speed in neurons sensitive to both speed and direction of motion." Journal of Neurophysiology 115, no. 3 (2016): 1703–12. http://dx.doi.org/10.1152/jn.00460.2015.

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Neurophysiological studies in primates have found that direction-sensitive neurons in the primary somatosensory cortex (SI) generally increase their response rate with increasing speed of object motion across the skin and show little evidence of speed tuning. We employed psychophysics to determine whether human perception of motion direction could be explained by features of such neurons and whether evidence can be found for a speed-tuned process. After adaptation to motion across the skin, a subsequently presented dynamic test stimulus yields an impression of motion in the opposite direction.

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9

Holt, Chris, Luis San Andre´s, Sunil Sahay, Peter Tang, Gerry La Rue, and Kostandin Gjika. "Test Response and Nonlinear Analysis of a Turbocharger Supported on Floating Ring Bearings." Journal of Vibration and Acoustics 127, no. 2 (2005): 107–15. http://dx.doi.org/10.1115/1.1857922.

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Measurements of casing acceleration on an automotive turbocharger running to a top speed of 115 krpm and driven by ambient temperature pressurized air are reported. Waterfall acceleration spectra versus rotor speed show the effects of increasing lubricant inlet pressure and temperature on turbocharger rotordynamic response. A comprehensive analysis of the test data shows regimes of speed operation with two subsynchronous whirl motions (rotordynamic instabilities). Increasing the lubricant feed pressure delays the onset speed of instability for the most severe subsynchronous motion. However, in

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10

Demeulenaere, B., and J. De Schutter. "Synthesis of Inertially Compensated Variable-Speed Cams." Journal of Mechanical Design 125, no. 3 (2003): 593–601. http://dx.doi.org/10.1115/1.1582502.

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Traditionally, cam-follower systems are designed by assuming a constant camshaft speed. Nevertheless, all cam-follower systems, especially high-speed systems, exhibit some camshaft speed fluctuation (despite the presence of a flywheel) which causes the follower motions to be inaccurate. This paper therefore proposes a novel design procedure that explicitly takes into account the camshaft speed variation. The design procedure assumes that (i) the cam-follower system is conservative and (ii) all forces are inertial. The design procedure is based on a single design choice, i.e., the amount of cam

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11

Jörges, Björn, and Laurence R. Harris. "Object speed perception during lateral visual self-motion." Attention, Perception, & Psychophysics 84, no. 1 (2021): 25–46. http://dx.doi.org/10.3758/s13414-021-02372-4.

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AbstractJudging object speed during observer self-motion requires disambiguating retinal stimulation from two sources: self-motion and object motion. According to the Flow Parsing hypothesis, observers estimate their own motion, then subtract the retinal corresponding motion from the total retinal stimulation and interpret the remaining stimulation as pertaining to object motion. Subtracting noisier self-motion information from retinal input should lead to a decrease in precision. Furthermore, when self-motion is only simulated visually, self-motion is likely to be underestimated, yielding an

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12

Newsome, W. T., A. Mikami, and R. H. Wurtz. "Motion selectivity in macaque visual cortex. III. Psychophysics and physiology of apparent motion." Journal of Neurophysiology 55, no. 6 (1986): 1340–51. http://dx.doi.org/10.1152/jn.1986.55.6.1340.

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We have conducted physiological and psychophysical experiments to identify possible neural substrates of the perception of apparent motion. We used identical sequences of flashed stimuli in both sets of experiments to better compare the responses of cortical neurons and psychophysical observers. Physiological data were obtained from two cortical visual areas, striate cortex (V1) and the middle temporal area (MT). In the previous paper we presented evidence that neuronal thresholds for direction selectivity in extrastriate area MT were similar to psychophysical thresholds for motion perception

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13

Vollmer, Michael, and Klaus-Peter Möllmann. "Slow Speed - Fast Motion." Physik in unserer Zeit 49, no. 4 (2018): 190–93. http://dx.doi.org/10.1002/piuz.201801507.

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14

CAO, AN, and PETER H. SCHILLER. "Neural responses to relative speed in the primary visual cortex of rhesus monkey." Visual Neuroscience 20, no. 1 (2003): 77–84. http://dx.doi.org/10.1017/s0952523803201085.

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Relative motion information, especially relative speed between different input patterns, is required for solving many complex tasks of the visual system, such as depth perception by motion parallax and motion-induced figure/ground segmentation. However, little is known about the neural substrate for processing relative speed information. To explore the neural mechanisms for relative speed, we recorded single-unit responses to relative motion in the primary visual cortex (area V1) of rhesus monkeys while presenting sets of random-dot arrays moving at different speeds. We found that most V1 neur

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15

Lu, Lin, Cisong Gao, Fei Li, et al. "Experimental Investigation into the Tail-Slapping Motion of a Projectile with an Oblique Water-Entry Speed." Journal of Marine Science and Engineering 11, no. 9 (2023): 1664. http://dx.doi.org/10.3390/jmse11091664.

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In this study, the tail-slapping behavior of an oblique water-entry projectile is investigated through high-speed photography technology. The experimental images and data are captured, extracted and processed using a digital image processing method. The experimental repeatability is verified. By examining the formation, development and collapse process of the projectile’s cavity, this study investigates the impact of the tail-slapping motion on the cavity’s evolution. Furthermore, it examines the distinctive characteristics of both the tail-slapping cavity and the original cavity at varying in

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16

Davis, M. R., N. L. Watson, and D. S. Holloway. "Measurement of Response Amplitude Operators for an 86 m High-Speed Catamaran." Journal of Ship Research 49, no. 02 (2005): 121–43. http://dx.doi.org/10.5957/jsr.2005.49.2.121.

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Radar observations of encountered wave profile and measurements of vessel motions have been used to derive motion response amplitude operators, and the results are compared with predicted motion responses. Data were collected from an INCAT Tasmania built ferry while on delivery between Australia and England. It has been found that the predicted motions using a time domain method are consistent with those observed with respect to the increase of response with vessel speed and the decrease of response for seas encountered from the beam directions. Peak heave and pitch response amplitude operator

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17

Xiang, Jian. "A Novel Motion Retrieval Method Based on Revised Matching Algorithm and High Dimensional Index." Advanced Materials Research 468-471 (February 2012): 131–34. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.131.

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This paper proposes a method to speed up motion retrieval: matching algorithm improvement and motion high-dimensional index. The fast elimination algorithm is used to delete most of motions that are not similar with samplings. Then indexing of high-dimensional feature is done with 3D motion data structure. The experimental results show that our method outperforms the classical motion retrieval method both in speed and accuracy.

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18

Sokolov, Alexander, and Marina Pavlova. "Timing Accuracy in Motion Extrapolation: Reverse Effects of Target Size and Visible Extent of Motion at Low and High Speeds." Perception 32, no. 6 (2003): 699–706. http://dx.doi.org/10.1068/p3397.

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By varying target size, speed, and extent of visible motion we examined the timing accuracy in motion extrapolation. Small or large targets (0.2 or 0.8 deg) moved at either 2.5, 5, or 10 deg s−1 across a horizontal path (2.5 or 10 deg) and then vanished behind an occluder. Observers responded when they judged that the target had reached a randomly specified position between 0 and 12 deg. With higher speeds, the timing accuracy (the reverse of absolute error) was better for small than for large targets, and for long than for short visible extents. With low speed, these effects were reversed. In

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19

Brunner, C. E., J. Kiefer, and M. Hultmark. "Comparison of dynamic stall on an airfoil undergoing sinusoidal and VAWT-shaped pitch motions." Journal of Physics: Conference Series 2265, no. 3 (2022): 032006. http://dx.doi.org/10.1088/1742-6596/2265/3/032006.

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Abstract The aerodynamics of vertical axis wind turbines (VAWTs) are inherently unsteady because the blades experience large angle of attack variations throughout a full turbine revolution. At low tip speed ratios, this can lead to a phenomenon known as dynamic stall. To better characterise the unsteady aerodynamics and represent them in models and simulations, data from studies of individual static or pitching airfoils are often applied to VAWT blades. However, these studies often involve sinusoidally pitching airfoils, whereas the pitching motions experienced by VAWTs are more complex. Here,

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20

Morishita, Yoshitaka, and Tsutomu Jinji. "Accuracy and Error Trends of Commercially Available Bat Swing Sensors in Baseball." Sports 10, no. 2 (2022): 21. http://dx.doi.org/10.3390/sports10020021.

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In baseball, the swing speed and swing angle of the bat just before ball impact are important to increase the speed and horizontal distance of a batted ball. This study investigated the accuracies and error trends of four commercially available bat sensors to measure these parameters. The hitting motions of seven healthy participants were measured simultaneously using the bat sensors and an optical motion capture system, and the swing speeds and swing angles were compared. The swing speed was measured with high accuracy, as indicated by the high intraclass correlation coefficient (ICC) between

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21

Lalonde-Parsi, Marie-Jasmine, and Anouk Lamontagne. "Perception of Self-Motion and Regulation of Walking Speed in Young-Old Adults." Motor Control 19, no. 3 (2015): 191–206. http://dx.doi.org/10.1123/mc.2014-0010.

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Whether a reduced perception of self-motion contributes to poor walking speed adaptations in older adults is unknown. In this study, speed discrimination thresholds (perceptual task) and walking speed adaptations (walking task) were compared between young (19–27 years) and young-old individuals (63–74 years), and the relationship between the performance on the two tasks was examined. Participants were evaluated while viewing a virtual corridor in a helmet-mounted display. Speed discrimination thresholds were determined using a staircase procedure. Walking speed modulation was assessed on a sel

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22

Yin, Zi Wu. "Three-Roll Planetary Rolling Mill Motion Analysis and Test Research." Advanced Materials Research 712-715 (June 2013): 1724–28. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1724.

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Against defects of three-roll fixed axis rolling mill caused by rolled piece rotating in process of rolling, presented three-roll planetary rolling scheme, designed the planetary transmission system structure, expounded planetary mill rolling process, analyzed movement relationship between planet carrier, roll and rolled piece according to planetary gear train transmission principle. The rolls do planetary motion and spinning motion both, the former acts on the rolled piece to make it do clockwise rotation movement, the latter acts on the rolled piece to make it do anti-clockwise rotation. The

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23

Smith, W. J., and D. J. Timoney. "On the Relative Roles of Fuel Spray Kinetic Energy and Engine Speed in Determining Mixing Rates in D.I. Diesel Engines." Journal of Engineering for Gas Turbines and Power 119, no. 1 (1997): 212–17. http://dx.doi.org/10.1115/1.2815552.

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This paper describes an attempt to separate out and to quantify the relative importance of fuel injection characteristics and in-cylinder air motion as factors influencing the rate of fuel-air mixing and of combustion in high-speed D.I. diesel engines, where bulk swirling air motion is absent. Tests on a 121 mm bore × 139 mm stroke, 1.6 liter, single-cylinder engine at constant engine speed reveal substantially shorter fuel-air mixing times as the mean fuel injection kinetic energy (M.I.K.E.) is increased. Also, tests at constant injection kinetic energy but with varying engine speed (involvin

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24

Lee, Chulhee, Donggyou Kim, and Dongku Kim. "Quality Assessment of High-Speed Motion Blur Images for Mobile Automated Tunnel Inspection." Sensors 25, no. 12 (2025): 3804. https://doi.org/10.3390/s25123804.

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This study quantitatively evaluates the impact of motion blur—caused by high-speed movement—on image quality in a mobile tunnel scanning system (MTSS). To simulate movement at speeds of up to 70 km/h, a high-speed translational motion panel was developed. Images were captured under conditions compliant with the ISO 12233 international standard, and image quality was assessed using two metrics: blurred edge width (BEW) and the spatial frequency response at 50% contrast (MTF50). Experiments were conducted under varying shutter speeds, lighting conditions (15,000 lx and 40,000 lx), and motion spe

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25

Kano, C. "Perception of Self-Motion Induced by Moving-Dot Patterns: The Interaction of the Stimulating Area and the Speed of the Pattern." Perception 26, no. 1_suppl (1997): 201. http://dx.doi.org/10.1068/v970349.

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A linear moving-dot pattern was presented to observers to induce self-motion. A stimulating circular area of more than 28.1 deg diameter induced self-motion perfectly, and even areas ranging from 5.7 deg to 11.4 deg diameter were able to elicit self-motion (Kano, 1995 Perception24 Supplement, 108). In the present study the interactive effects of the size of the stimulating area and the speed of the moving pattern on the perception of self-motion were examined. Random-dot patterns were moved downward in a circular area on a screen in a dark room. The diameters of the circular area were 5.7, 11.

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HAGIWARA, Shinsaku, Yuzo SAITO, Isao SHIBATA, and Eiji WAKAMATSU. "High Speed Polishing by High Speed Particle Motion." Proceedings of Yamanashi District Conference 2002 (2002): 131–32. http://dx.doi.org/10.1299/jsmeyamanashi.2002.131.

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27

van Boxtel, Jeroen J. A., Raymond van Ee, and Casper J. Erkelens. "A Single System Explains Human Speed Perception." Journal of Cognitive Neuroscience 18, no. 11 (2006): 1808–19. http://dx.doi.org/10.1162/jocn.2006.18.11.1808.

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Motion is fully described by a direction and a speed. The processing of direction information by the visual system has been extensively studied; much less is known, however, about the processing of speed. Although it is generally accepted that the direction of motion is processed by a single motion system, no such consensus exists for speed. Psychophysical data from humans suggest two separate systems processing luminance-based fast and slow speeds, whereas neurophysiological recordings in monkeys generally show continuous speed representation, hinting at a single system. Although the neurophy

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28

Gennadiy, Filimonikhin, Amosov Volodymyr, Haleeva Antonina, et al. "Estimating the stability of steady motion of vibration machines operating on the somerfeld effect using an empirical method." Eastern-European Journal of Enterprise Technologies 6, no. 7 (120) (2022): 45–53. https://doi.org/10.15587/1729-4061.2022.268718.

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One-, two-, and three-mass vibration machines with translational motion of platforms and a vibration exciter of a ball, roller, or pendulum type with several loads were studied. The empirical criterion for the onset of auto-balancing was applied in the extended formulation. It has been established that a single-mass vibration machine has one resonant speed, and: – at the after-resonance speeds of rotation of loads synchronously with the rotor, the auto-balancing mode becomes stable; – at the pre-resonance speeds of rotation of loads, loads tend to gather together. In a du

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29

Zhou, Le, Yi Wei, Hongwen Zhang, et al. "Surface Roughening of Pt-Polystyrene Spherical Janus Micromotors for Enhanced Motion Speed." Micromachines 13, no. 4 (2022): 555. http://dx.doi.org/10.3390/mi13040555.

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Spherical Janus micromotors (SJMs) have attracted much attention, and their high-speed motion is highly desired due to their various potential applications. However, the conventional template-deposition method often leads to an active Pt coating with a smooth surface, which is unbeneficial to speed enhancement in terms of catalytic reaction. Here, a facile surface roughening method is presented to fabricate the Pt-polystyrene (PS) SJMs with rough Pt surface (or Ptr-PS SJMs) by plasma-etching the PS colloidal monolayer and then depositing Pt. The Ptr-PS SJMs can exhibit directional motion pushe

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30

Martin, Camille, Patrick Boissy, Mathieu Hamel, and Karina Lebel. "Instrumented Pre-Hospital Care Simulation Mannequin for Use in Spinal Motion Restrictions Scenarios: Validation of Cervical and Lumbar Motion Assessment." Sensors 24, no. 4 (2024): 1055. http://dx.doi.org/10.3390/s24041055.

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Background: A mid-fidelity simulation mannequin, equipped with an instrumented cervical and lumbar spine, was developed to investigate best practices and train healthcare professionals in applying spinal motion restrictions (SMRs) during the early mobilization and transfer of accident victims with suspected spine injury. The study objectives are to (1) examine accuracy of the cervical and lumbar motions measured with the mannequin; and (2) confirm that the speed of motion has no bearing on this accuracy. Methods: Accuracy was evaluated by concurrently comparing the orientation data obtained wi

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31

MASHHOON, BAHRAM. "BEYOND GRAVITOELECTROMAGNETISM: CRITICAL SPEED IN GRAVITATIONAL MOTION." International Journal of Modern Physics D 14, no. 12 (2005): 2025–37. http://dx.doi.org/10.1142/s0218271805008121.

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A null ray approaching a distant astronomical source appears to slow down, while a massive particle speeds up in accordance with Newtonian gravitation. The integration of these apparently incompatible aspects of motion in general relativity is due to the existence of a critical speed. The dynamics of particles moving faster than the critical speed could then be contrary to Newtonian expectations. Working within the framework of gravitoelectromagnetism, the implications of the existence of a critical speed are explored. The results are expected to be significant for high energy astrophysics.

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32

Bansal, Ambika, Meaghan McManus, Björn Jörges, and Laurence R. Harris. "Perceived travel distance depends on the speed and direction of self-motion." PLOS ONE 19, no. 9 (2024): e0305661. http://dx.doi.org/10.1371/journal.pone.0305661.

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Although estimating travel distance is essential to our ability to move through the world, our distance estimates can be inaccurate. These odometric errors occur because people tend to perceive that they have moved further than they had. Many of the studies investigating the perception of travel distance have primarily used forward translational movements, and postulate that perceived travel distance results from integration over distance and is independent of travel speed. Speed effects would imply integration over time as well as space. To examine travel distance perception with different di

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Sung, Mankyu, and Yejin Kim. "GPU-based Fast Motion Synthesis of Large Crowds Using Adaptive Multi-Joint Models." Symmetry 11, no. 3 (2019): 422. http://dx.doi.org/10.3390/sym11030422.

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This paper introduces a GPU (graphics processing unit)-based fast motion synthesis algorithm for a large crowd. The main parts of the algorithms were selecting the most appropriate joint model given adaptive screen-space occupancy of each character and synthesizing motions for the joint model with one or two input motion capture data. The different joint models had a character range from fine-detailed and fully-articulated ones to the most simplified ones. The motion synthesizer, running on a GPU, performed a series of motion blending for each joint of the characters in parallel. For better pe

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34

Bowne, Samuel F., Donald A. Glaser, and Suzanne P. McKee. "Motion interference in speed discrimination." Journal of the Optical Society of America A 6, no. 7 (1989): 1112. http://dx.doi.org/10.1364/josaa.6.001112.

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35

Zwicker, A. E., and D. E. Giaschi. "Speed-tuned global motion mechanisms." Journal of Vision 5, no. 8 (2005): 840. http://dx.doi.org/10.1167/5.8.840.

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36

Verghese, Preeti, and Suzanne P. McKee. "Motion grouping impairs speed discrimination." Vision Research 46, no. 8-9 (2006): 1540–46. http://dx.doi.org/10.1016/j.visres.2005.07.029.

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37

Disch, M., T. Takeuchi, and K. De Valois. "Perceived speed of cycloidal motion." Journal of Vision 1, no. 3 (2010): 376. http://dx.doi.org/10.1167/1.3.376.

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38

Castet, Eric. "Apparent speed of sampled motion." Vision Research 35, no. 10 (1995): 1375–84. http://dx.doi.org/10.1016/0042-6989(95)98717-n.

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39

Zhihui, Liu, Jiahao Zhang, Zhijian Zhang, Yingzhi Gu, Xue Wen, and Kejun Zhu. "Study on nonlinear dynamic characteristics of a two-speed transmission system at low speed." PLOS ONE 19, no. 2 (2024): e0298395. http://dx.doi.org/10.1371/journal.pone.0298395.

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A pure shear mechanical model of low gear of six-degree-of-freedom two-speed transmission system is established by using lumped parameter method. The Runge-Kutta method is used to numerically solve the aforementioned nonlinear system. The variation of transmission error between gears is analyzed by using global bifurcation, time domain diagram, phase diagram and Poincare cross section. Moreover, the transfer error bifurcation characteristics of the solar wheel and the first planetary wheel under different gear moduli are investigated. The results show that: by taking the excitation frequency a

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40

Lovell, Ric, and Grant Abt. "Individualization of Time–Motion Analysis: A Case-Cohort Example." International Journal of Sports Physiology and Performance 8, no. 4 (2013): 456–58. http://dx.doi.org/10.1123/ijspp.8.4.456.

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Purpose:To report the intensity distribution of Premier League soccer players’ external loads during match play, according to recognized physiological thresholds. The authors also present a case in which individualized speed thresholds changed the interpretation of time–motion data.Method:Eight outfield players performed an incremental treadmill test to exhaustion to determine the running speeds associated with their ventilatory thresholds. The running speeds were then used to individualize time–motion data collected in 5 competitive fixtures and compared with commonly applied arbitrary speed

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Fitriadhy, Ahmad, Nurul Aqilah Mansor, and Nur Adlina Aldin. "Heave and Pitch Motions of a Towed Ship in Waves Incorporated with an Asymmetrical Bridle Towline Model." EPI International Journal of Engineering 2, no. 1 (2019): 34–40. http://dx.doi.org/10.25042/epi-ije.022019.07.

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Investigation of a ship towing system performance in waves incorporated with an asymmetrical towline configuration is necessarily to be studied to ensure a towing safety of navigation. To achieve the objective, this paper presents the ship towing motion performance in waves using Computational Fluid Dynamic (CFD) approach. Here, the heave and pitch motions of the towed ship so-called barge has been analysed, where several effects of the towing angle and towing speeds have been taken into account. In the calm water condition, the results revealed that the increase of tow angle was proportional

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Holloway, D. S., and M. R. Davis. "Ship Motion Computations Using a High Froude Number Time Domain Strip Theory." Journal of Ship Research 50, no. 01 (2006): 15–30. http://dx.doi.org/10.5957/jsr.2006.50.1.15.

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High-speed strip theories are discussed, and a time domain formulation making use of a fixed reference frame for the two-dimensional fluid motion is described in detail. This, and classical (low-speed) strip theory, are compared with the experimental results of Wellicome et al. (1995) up to a Froude number of 0.8, as well as with our own test data for a semi-SWATH, demonstrating the marked improvement of the predictions of the former at high speeds, while the need to account for modest viscous effects at these speeds is also argued. A significant contribution to time domain computations is a m

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Im, Namkyun, and Sangmin Lee. "Effects of Forward Speed and Wave Height on the Seakeeping Performance of a Small Fishing Vessel." Journal of Marine Science and Engineering 10, no. 12 (2022): 1936. http://dx.doi.org/10.3390/jmse10121936.

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The effects of wave height and forward speed on the seakeeping performance of a small fishing vessel in irregular waves are evaluated using computational fluid dynamics (CFD). The wave height effect changed linearly for a forward speed in the head sea and beam sea. In the stationary state, the heave and roll motions attributed to the wave height appear nonlinearly. The effect of the speed showed a non-linear shape wherein the heave motion became larger with an increase in the forward speed in beam sea. The seakeeping performance of pitch motion is greatly improved at forward speed rather than

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Au, Wing Lok, Irene Soo Hoon Seah, Wei Li, and Louis Chew Seng Tan. "Effects of Age and Gender on Hand Motion Tasks." Parkinson's Disease 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/862427.

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Objective. Wearable and wireless motion sensor devices have facilitated the automated computation of speed, amplitude, and rhythm of hand motion tasks. The aim of this study is to determine if there are any biological influences on these kinematic parameters.Methods. 80 healthy subjects performed hand motion tasks twice for each hand, with movements measured using a wireless motion sensor device (Kinesia, Cleveland Medical Devices Inc., Cleveland, OH). Multivariate analyses were performed with age, gender, and height added into the model.Results. Older subjects performed poorer in finger tappi

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Meier, Kimberly, Marita Partanen, and Deborah Giaschi. "Neural Correlates of Speed-Tuned Motion Perception in Healthy Adults." Perception 47, no. 6 (2018): 660–83. http://dx.doi.org/10.1177/0301006618771463.

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It has been suggested that slow and medium-to-fast speeds of motion may be processed by at least partially separate mechanisms. The purpose of this study was to establish the cortical areas activated during motion-defined form and global motion tasks as a function of speed, using functional magnetic resonance imaging. Participants performed discrimination tasks with random dot stimuli at high coherence, at coherence near their own thresholds, and for random motion. Stimuli were moving at 0.1 or 5 deg/s. In the motion-defined form task, lateral occipital complex, V5/MT+ and intraparietal sulcus

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Lee, Ho-Hoon. "A New Motion-Planning Scheme for Overhead Cranes With High-Speed Hoisting." Journal of Dynamic Systems, Measurement, and Control 126, no. 2 (2004): 359–64. http://dx.doi.org/10.1115/1.1767855.

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This paper proposes a motion-planning method for a high-performance anti-swing control of overhead cranes, where the motion-planning problem is solved as a kinematic problem. First, an anti-swing regulating control law is proposed based on the Lyapunov stability theorem, where the proposed anti-swing control drives trolley velocity regulating error asymptotically to zero while suppressing load swing rapidly to zero for given arbitrary high-speed hoisting motions. Then a motion-planning scheme is designed based on the concept of minimumtime control, the proposed anti-swing control law, and typi

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Churchland, Anne K., Xin Huang, and Stephen G. Lisberger. "Responses of Neurons in the Medial Superior Temporal Visual Area to Apparent Motion Stimuli in Macaque Monkeys." Journal of Neurophysiology 97, no. 1 (2007): 272–82. http://dx.doi.org/10.1152/jn.00941.2005.

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Monkeys fixated a stationary spot during presentation of dot textures that moved in apparent motion defined by the spatial and temporal separations, Δx and Δt, between successive flashes of each dot. For each neuron, we assessed the speed tuning for smooth motion (Δt = 2 or 4 ms) at speeds ≤128°/s and the effect of varying the value of Δt at speeds of 16 and 32°/s. Many medial superior temporal (MST) neurons, like middle temporal (MT) neurons, were tuned for the speed of smooth motion and showed decreases in firing rate as the value of Δt increased at a constant speed. A subset of MST neurons,

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Miura, Takeshi, Takaaki Kaiga, Naho Matsumoto, et al. "Characterization of Motion Capture Data by Motion Speed Variation." IEEJ Transactions on Electronics, Information and Systems 133, no. 4 (2013): 906–7. http://dx.doi.org/10.1541/ieejeiss.133.906.

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Lin, Yirui, Zhoucheng Jiang, Ya-nan Wang, Yunhang Zeng, Guo Xie, and Bi Shi. "Experimental and Computational Fluid Dynamics Investigation on Tanning Process in a Rotating Drum." Journal of the American Leather Chemists Association 118, no. 11 (2023): 485–95. http://dx.doi.org/10.34314/jalca.v118i11.8242.

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Mass transfer of chemicals greatly affects leather production efficiency and product quality. Leather shows different motions in a rotating drum during processing, which is strongly associated with chemicals’ mass transfer. However, how leather motions affect mass transfer remains unclear, which disfavors highly efficient leather manufacturing process. Here, different leather motion states were obtained by adjusting the drum rotation speed. Experimental results showed that the duration of leather rolling motion greatly increased by 41% when the rotation speed increased from 5 r/min to 20 r/min

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Bex, Peter J., Samantha Bedingham, and Stephen T. Hammett. "Apparent speed and speed sensitivity during adaptation to motion." Journal of the Optical Society of America A 16, no. 12 (1999): 2817. http://dx.doi.org/10.1364/josaa.16.002817.

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