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Littérature scientifique sur le sujet « Time-motion analysis »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Time-motion analysis"

Minghelli, Beatriz. « Time-motion analysis in surf : benefits ». International Journal of Sport, Exercise and Health Research 2, n^o 1 (2018) : 97–99. http://dx.doi.org/10.31254/sportmed.2105.

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Nesi, P., F. Innocenti et P. Pezzati. « RETIMAC : REal-TIme Motion Analysis Chip ». IEEE Transactions on Circuits and Systems II : Analog and Digital Signal Processing 45, n^o 3 (mars 1998) : 361–75. http://dx.doi.org/10.1109/82.664242.

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Cánovas López, María, José L. Arias, Pablo García Marín et Juan Luis Yuste. « Time-Motion Analysis Procedure in Team Sports ». Strength and Conditioning Journal 36, n^o 3 (juin 2014) : 71–75. http://dx.doi.org/10.1519/ssc.0000000000000061.

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KURITA, Yutaka, Yuichi MATSUMURA, Yuya INOUE, Fumitake TOMITA, Setsuko TAKEMURA et Kazumi YOKOI. « Real-time Motion Analysis Using CCD Camera ». Transactions of the Japan Society of Mechanical Engineers Series C 74, n^o 742 (2008) : 1546–53. http://dx.doi.org/10.1299/kikaic.74.1546.

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Sanchez, B., E. Louarroudi, S. B. Rutkove et R. Pintelon. « Circular motion analysis of time-varying bioimpedance ». Physiological Measurement 36, n^o 11 (22 octobre 2015) : 2353–67. http://dx.doi.org/10.1088/0967-3334/36/11/2353.

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Franchini, Emerson, Guilherme Giannini Artioli et Ciro José Brito. « Judo combat : time-motion analysis and physiology ». International Journal of Performance Analysis in Sport 13, n^o 3 (décembre 2013) : 624–41. http://dx.doi.org/10.1080/24748668.2013.11868676.

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Higgs, Colin. « Wheelchair Racquetball : A Preliminary Time Motion Analysis ». Adapted Physical Activity Quarterly 7, n^o 4 (octobre 1990) : 370–84. http://dx.doi.org/10.1123/apaq.7.4.370.

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Wheelchair racquetball players in the A and B divisions of the 1989 Canadian Racquetball Championships were videotaped and their performances were analyzed. The results indicated that the athletes had an exercise-to-pause ratio of 1:1.5 at the A level and 1:2.3 at the B level. Rallies were slightly longer at the higher level, with substantially longer pause periods at the B level. There was a higher percentage of longer rallies at the A level, although both divisions of play had comparable percentages of forehand and backhand shots. A-level players demonstrated greater distances covered per rally, greater wheelchair speed, and a higher degree of wheelchair maneuverability measured by the number and magnitude of directional changes. In particular, A-level players showed a greater tendency to use small directional corrections, particularly turns to the right of less than 45 °. It is suggested that this action allowed a less restricted backswing for powerful forehand shots.

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McManus, A., M. Stevenson et C. Finch. « 115 Time-motion analysis - non-elite netball ». Journal of Science and Medicine in Sport 8 (décembre 2005) : 68. http://dx.doi.org/10.1016/s1440-2440(17)30610-2.

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Clayton, Hilary M. « Time-motion analysis of show jumping competitions ». Journal of Equine Veterinary Science 16, n^o 6 (juin 1996) : 262–66. http://dx.doi.org/10.1016/s0737-0806(96)80195-x.

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KURITA, Yutaka, Yuichi MATSUMURA, Yuya INOUE, Fumitake TOMITA, Setsuko TAKEMURA et Kazumi YOKOI. « Real-time Motion Analysis Using CCD Camera ». Journal of Environment and Engineering 5, n^o 1 (2010) : 144–56. http://dx.doi.org/10.1299/jee.5.144.

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Thèses sur le sujet "Time-motion analysis"

Pochobradsky, Pavel. « Computerized system for time-motion analysis ». Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26306.

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Regular participation in sports is a common practice among the general population. For cardiovascular fitness, the frequency, duration, intensity and mode of the activity must be appropriate for the individual to benefit from the activity. The benefits for cardiovascular fitness are questionable in sports involving high intensity intermittent exercise of short duration. In the past, the procedures for determination of the heart rate and the time-motion characteristics of an activity were cumbersome and time consuming, thus making application to sports an inconvenience. The purpose of this project was to develop a computer based system for matching heart rate data with time-motion characteristics. The system was tested using ice hockey and squash. Subjects were observed during activity. The heart rate data during the activity were collected using a Polar Vantage XL Heart Rate monitor set to record heart rate values in 5-second intervals. The duration and type of activity were entered in the computer in real time using a coding system. Program combined the time-motion analysis with the heart rates that were downloaded from the Polar heart rate monitor. The results were summarized as follows: (1) total time at each intensity level, (2) mean duration at each intensity level, and (3) mean heart rate at each intensity level. Output from the computer program was similar to manual calculations.

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McLaughlin, Elaine. « Children's recreational activity and health : a time-motion analysis study ». Thesis, University of Ulster, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272338.

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de, Klerk Melissa. « Time Motion Analysis and Hip Abductor Strength Changes in Netball ». Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2011. https://ro.ecu.edu.au/theses/415.

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Netball is the most popular sport among females in Australia, with an estimated one million registered players nation wide. Despite its popularity, there are limited published studies about the physical and biomechanical demands of netball. This thesis assessed the type and frequency of lateral and landing movements that occur during a netball game (Study 1), examined the validity and reliability of handheld dynamometry to measure hip abductor strength that has been shown to be associated with the risk of non-contact anterior cruciate ligament injuries (ACL) injuries (Study 2), and investigated changes in hip abductor strength following a netball game (Study 3). In Study 1, the frequency of sidesteps, crossover cuts and lands during a netball game was analysed for five recorded netball games, and was compared across the five positional groups centre (C), wing attack (WA), wing defence (WD), goal attack (GA), and goal defence (GD). Average number of movements per game was 2668 of which C performed 27%, which was significantly (p < 0.05) greater compared with the other positions. Significantly (p < 0.05) more sidesteps and crossover cuts occurred at the small angle of cut (0°- 45°) compared to the large angle of cut (45° - 180°), and significantly (p < 0.05) more single leg lands occurred than double leg. Shuffles were used significantly (p < 0.01) more compared to all other lateral and landing movements. It was concluded that C performed significantly more lateral and landing movements, which may increase their level of fatigue and susceptibility to non-contact anterior cruciate ligament injuries. Across all positions single leg landings occurred more often than double leg landings, and are known to increase loads on the knee. Although the majority of change of direction movements occurred at the smaller angle there was a considerable amount performed with the greater angle, which has also been related to increased knee loads. The reported information provides context on which playing positions may be more susceptible to non-contact knee injuries and which movements may increase fatigue with a presumed increased risk of non-contact knee injuries. Although more research is needed in this area, this information is important in developing training to decrease knee injury risk. In Study 2, nine women (18 - 29 years) performed three maximal isometric contractions of the hip abductors at 0°, 15° and 30° of hip abduction on an isokinetic dynamometer, and a handheld dynamometer attached to the isokinetic dynamometer. The correlation assessed by a Pearson product-moment correlation coefficient (r) between the dynamometers was high (r = 0.9) at 0°, low at 15° (r = 0.69) and absent at 30° (r = 0.12). Reliability of the handheld dynamometer based on intraclass correlation coefficient (R) was moderate for 0° (R = 0.80) and 30° (R = 0.88) but poor at 15° (R = 0.55) for within-day (1 h apart), and moderate for 0° (R = 0.89) and 15° (R = 0.76), and good at 30° (R = 0.96) for between-days (1 week apart). The coefficient of variation was less than 7% for all angles. The handheld dynamometer’s surface area was increased by modification, and validity and reliability were re-assessed using another 10 (19-28 years) women. The correlation between the dynamometers improved at 15° (r = 0.9) and 30° (r = 0.8), and the reliability was high at all angles (R > 0.9, CV = 5%). It was concluded that the handheld dynamometer with modification could be used to reliably measure hip abduction isometric strength at different angles. Study 3 investigated changes in maximum voluntary hip abductor isometric strength before, within 5 min and 10 min after a netball game using the modified handheld dynamometer for 30 recreational netball players (18 - 34 years). For each time point, two 3 s maximum contractions at 15° of hip abduction with a 60 s rest between contractions were measured. A Category Ratio 10 scale was used to assess rate of perceived exertion (RPE) 30 min after the game. Hip abduction strength decreased (p < 0.01) by 12.0 ± 7.4% from pre (20.9 ± 3.2 kg) to post game (18.4 ± 3.1 kg) and was still lower (p < 0.01) than baseline at 10 minutes post game (19.5 ± 3.5 kg). The average RPE was 4.5 ± 2.2, and a low correlation (r = 0.39, p < 0.01) was evident between RPE and the decrease in the strength immediately post-game. These results show that a netball game induces neuromuscular fatigue to the hip abductors, which could increase the risk of non-contact ACL injuries.

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Hong, Wee Pheng. « Physiological characteristics and time-motion analysis of young soccer players ». Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2009. https://ro.ecu.edu.au/theses/1900.

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The majority of the literature on physiological testing and time-motion analysis (TMA) of soccer performance has been conducted on elite senior soccer players. Few TMA studies have focused on young soccer players and currently, there is nothing focusing on global positioning system (GPS) derived data in this cohort. This study aimed to assess in a group of youth soccer players, the reliability of the selected physiological variables, establish a physiological profile of essential performance characteristics, quantify match-related performance such as time motion characteristics, positional roles and physical demands, and examine the relationship between criterion measures acquired from physiological testing and GPS data during match-play. Thirty-four male outfield players (mean ± standard deviation; age 16.5 ± 1.1 years; height 175.2 ± 6.0 cm; weight 65.3 ± 7.2 kg) from three Premier Division 18s soccer teams in the Western Australia State League were recruited and split according to playing position; centre-backs (n=6), fullbacks (n=6), central midfielders (n=7), wide midfielders (n=8) and strikers (n=7). Test-retest reliability and the performance of physiological variables such as peak force, rate of force development (RFD), peak power, vertical jump (VJ) height, agility, aerobic endurance, sprint performance and repeated sprint ability (RSA) were established. The participants from each team were tracked by GPS (GPSports SPI Elite, ACT, Australia) over the entire playing time of four consecutive matches, and in total, GPS data was accumulated from twelve league games for TMA of soccer performance. All variables of the RFD, static jump (SJ), Soccer Specific Agility Test (SSAT), 20 m and 10 m sprint times, and percent sprint decrement of RSA (RSAdec), were associated with low intraclass correlation coefficient (ICC) values, suggesting poor test-retest reliability. No significant differences were revealed by one way repeated measures ANOVA for the mean performance of any of the physiological variables between playing positions with the exception of one criterion measure of the SSAT, while numerous significant main effects across positional groupings were found in the GPS data acquired during match-play (p < 0.05). Paired t tests identified a number of significant main effects among match-related performance between playing halves (p < 0.05). In addition, many large and moderate effect size (ES) values for performance measures between playing positions and halves were detected. Pearson product correlations were used to examine relationships with significant and strong inverse correlations evident between the variables of the 30 m sprint, RSA test and SSAT, and sprint performance during match-play (r = -0.506 to -0.644; p < 0.05). This study showed that the physiological profiles of essential performance characteristics for young soccer players were similar across playing positions. There were numerous significant main effects between playing positions and halves during match-play, and hence, position-specific testing and conditioning protocols may be efficacious in effectively preparing young soccer players for competition. More TMA studies of young soccer players using larger sample sizes are warranted to substantiate the findings of this study.

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Peddie, David L. (David Lee). « Time-motion analysis and heart rate telemetry of ice hockey play ». Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22617.

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The purpose of this study was to measure the intensity and duration of ice hockey play for six university hockey players (three forwards and three defencemen) and to compare them with the results to a similar study published in 1976. Comparisons of heart rate output and time-motion characteristics between forwards and defencemen were examined as well as differences in intensity between practices and games. The players performed at significantly lower intensity, had less playing time per shift, and had less playing time per game than the players in the 1976 study. Both investigations had similar bench times between shifts. The forwards had significantly different time-motion characteristics from the defencemen but similar playing time intensity. The intensity of games was higher than practices in terms of on-ice intensity but similar in terms of total time above a threshold intensity ($ geq$ 70% of HRmax).

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Kahn, Bradley. « Heart rate telemetry and time-motion analysis of ice hockey referees ». Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82259.

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Referees have a job to ensure a safe and fair playing environment. The purpose of this study was to quantify on-ice intensities (heart rate) and on-ice movements (forward or backwards skating or stationary) of referees during ice hockey games. 15 HC referees had their heart rates monitored and skating video taped throughout a 60 minute game. A treadmill run test was used to identify their peak heart rates and VO2. The dominant on-ice activity was forward skating followed by stationary then backwards skating. On average referees worked at 80% of their peak heart rate. Significant differences (p<0.05) were found between period average heart rates and peak heart rates. The results suggest that referees generally work at an aerobic intensity with numerous anaerobic bursts interspersed throughout play. Knowledge about the intensity, frequency and amount of skating that occurs in each direction will help with the development of the athletic ability of referees.

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Brownridge, Adam Mark. « Real-time motion capture for analysis and presentation within virtual environments ». Thesis, Manchester Metropolitan University, 2014. http://e-space.mmu.ac.uk/326218/.

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This thesis describes motion capture methods with an application for real-time recording of extreme human movement. A wireless gyroscopic sensor based system is used to record and evaluate misalignments in ankle position of ballet dancers in a performance environment. Anatomic alignment has been shown to contribute to dance related injuries, and results of this work show that subtle variations in joint rotation can be clearly measured. The workflow has been developed to extract performance analysis data for fault detection in order to assist augmented feedback methods for the prevention of injury and improved performance. Infra-red depth sensing technology, commonly used in garment design, has been used to produce a representation of a scanned human subject and a workflow established to utilise this character avatar for animation using motion capture data. The process of presenting a visually acceptable representation of an overall performance in addition to the numerical evaluation of specific joint orientation provides a significant contribution to knowledge.

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Challis, Darren. « A time-motion, technical and tactical analysis of lightweight women's judo ». Thesis, Anglia Ruskin University, 2017. http://arro.anglia.ac.uk/703789/.

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Introduction: This study analysed lightweight women’s judo from three common aspects, time-motion, technical and tactical in order to develop a deeper understanding of the demands placed specifically on this population and whether they differ to others. This information may allow coaches to develop specific training for this population. Method: Analysing all the fights that included lightweight women in the 2010 and 2014 World Judo Championships, 251 athletes across 267 contests were analysed. Video was collected live and downloaded from youtube before being analysed in Sportscode Elite software and exported into Microsoft excel and SPSS for further analysis. Results: Lightweight women appear to have similar time-motion characteristics to previous research across all weight categories. Of the 2284 attacks Ippon-seoi-nage, Uchimata and Sode-tsuri-komi-goshi have the highest frequency but the most efficient throws are O-sotogari, Morote-seoi-nage and O-uchi-gari. The most prevalent and efficient category for Tachiwaza techniques was Ashi-waza and in Ne-waza it was Osaekomi-waza. The effects of laterality and handedness seen in previous research either does not apply to this population or its affects have diminished across judo. Discussion and conclusion: There are similarities between previous reports across weight categories and lightweight women’s judo for time-motion characteristics, types of technique used, category of techniques used, direction of attack, laterality and use of combinations. However, differences appear in the efficiency of counters with lightweight females being very effective at countering their opponents. The popularity of Sode-tsuri-komi-goshi should be closely considered by coaches and is likely to be an emerging theme across all weight categories. There is also significant difference in the data analysing the effect of laterality on performance with difference seeming to diminish, this may also be an emerging trend across all weight categories and possibly all sports. This research appears to be one of the first to tackle fatigue based upon elite level performance in judo and the first to categorise Shido’s by the offence and shows the larger number of offences are for passivity. There are also large discrepancies noted between this research and the IJF databases.

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Challis, Darren. « A time-motion, technical and tactical analysis of lightweight women's judo ». Thesis, Anglia Ruskin University, 2017. https://arro.anglia.ac.uk/id/eprint/703789/1/Challis_2017.pdf.

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Criton, Aline Laure. « An investigation of real time ultrasound Doppler techniques for tissue motion and deformation analysis ». Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/29080.

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The objective of this dissertation research is to develop new techniques based on Doppler ultrasound to investigate and visualize changes in tissue dynamic and deformation properties due to atherosclerosis in cardiac and vascular applications. A new technique, to correct for the Doppler angle dependency for tissue motion analysis has been developed. It is based on multiple ultrasound beams, and has been validated in vitro to study tissue dynamic properties. It can measure tissue velocity magnitude with low bias (5%) and standard deviation (10%), and tissue velocity orientation with a bias less then 5 degrees and a standard deviation below 5 degrees. A new Doppler based method, called strain rate, has also been developed and validated in vitro for the quantification of regional vessel or myocardial wall deformation. Strain rate is derived from the velocity information and can assess tissue deformation with an accuracy of 5% and a standard deviation less than 10%. Some examples of cardiac strain rate imaging have been gathered and are described in this thesis. Strain rate, as all Doppler based techniques, suffers from angle dependency limitation. A method to estimate one-component strain rate in any direction in the two-dimensional image not necessarily along the ultrasound beam has been developed. The method allows correcting for the strain rate bias along any user-defined direction. In vitro experiments have shown that qualitative two-component strain rate tensor can be derived. Two-component vector velocity from the moving tissue was acquired and two two-component strain rate images were derived. The images showed agreement with the expected deformation pattern.

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Livres sur le sujet "Time-motion analysis"

Liapis, Stergios John. Time-domain analysis of ship motions. Ann Arbor, Mich : University Microfilms, 1986.

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Motion and time study : Improving productivity. 6^e éd. Englewood Cliffs, N.J : Prentice-Hall, 1985.

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1948-, Danner David, dir. Motion and time study : Improving productivity. 7^e éd. Englewood Cliffs, N.J : Prentice Hall, 1994.

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Mclaughlin, Elaine. Children's recreational activity and health : A time-motion analysis study. [s.l : The Author], 2003.

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Sewell, R. T. Ground motion input in seismic evaluation studies : Impacts of artificial time history input on in-structure demand spectra. Washington, DC : Division of Engineering Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1996.

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A, McNeill John, et SpringerLink (Online service), dir. The Designer's Guide to Jitter in Ring Oscillators. Boston, MA : Springer-Verlag US, 2009.

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1932-, Chow Chuen-Yen, Chang Sin-Chung et Lewis Research Center, dir. Application of the space-time conservation element and solution element method to shock-tube problem. Cleveland, Ohio : Lewis Research Center, National Aeronautics and Space Administration, 1994.

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Dommermuth, Douglas G. Time series analysis of ocean waves. Cambridge, Mass : Massachusetts Institute of Technology, Sea Grant College Program, 1986.

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Novels for students : Presenting analysis, context, and criticism on commonly studied novels. Detroit, Mich : Gale, 2010.

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Koršič, Igor. Suspended time : An analysis of Bazin's notion of objectivity of the film image. [Stockholm : University of Stockholm], 1988.

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Chapitres de livres sur le sujet "Time-motion analysis"

Wilm, Jakob, Oline V. Olesen, Rasmus R. Paulsen, Liselotte Højgaard, Bjarne Roed et Rasmus Larsen. « Real Time Surface Registration for PET Motion Tracking ». Dans Image Analysis, 166–75. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21227-7_16.

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Wilm, Jakob, Oline V. Olesen, Rasmus R. Paulsen et Rasmus Larsen. « Correction of Motion Artifacts for Real-Time Structured Light ». Dans Image Analysis, 142–51. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19665-7_12.

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Vannoorenberghe, Patrick, Cina Motamed, Jean-Marc Blosseville et Jack-Gérard Postaire. « Automatic pedestrian recognition using real-time motion analysis ». Dans Image Analysis and Processing, 493–500. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/3-540-63508-4_160.

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Guštin, V., et M. Čufer. « Motion detection with fuzzy logic in real time ». Dans Computer Analysis of Images and Patterns, 574–79. Berlin, Heidelberg : Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/3-540-60268-2_347.

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de Alcântara, Marlon F., Thierry P. Moreira et Helio Pedrini. « Motion Silhouette-Based Real Time Action Recognition ». Dans Progress in Pattern Recognition, Image Analysis, Computer Vision, and Applications, 471–78. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-41827-3_59.

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Christensen, Henrik I., et Erik Granum. « On token-matching in real time motion analysis ». Dans Lecture Notes in Computer Science, 448–57. Berlin, Heidelberg : Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/3-540-19036-8_45.

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Therón, Roberto, et Laura Casares. « Visual Analysis of Time-Motion in Basketball Games ». Dans Smart Graphics, 196–207. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13544-6_19.

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Schreer, Oliver, Ralf Tanger, Peter Eisert, Peter Kauff, Bernhard Kaspar et Roman Englert. « Real-Time Avatar Animation Steered by Live Body Motion ». Dans Image Analysis and Processing – ICIAP 2005, 147–54. Berlin, Heidelberg : Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11553595_18.

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Bulas-Cruz, J., A. T. Ali et E. L. Dagless. « A temporal smoothing technique for real-time motion detection ». Dans Computer Analysis of Images and Patterns, 379–86. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/3-540-57233-3_50.

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Pillet, Sébastien. « Time-resolved structural analysis : probing condensed matter in motion ». Dans Structures on Different Time Scales, sous la direction de Theo Woike et Dominik Schaniel, 143–220. Berlin, Boston : De Gruyter, 2018. http://dx.doi.org/10.1515/9783110433920-005.

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Actes de conférences sur le sujet "Time-motion analysis"

Ihaddadene, Nacim, et Chabane Djeraba. « Real-time crowd motion analysis ». Dans 2008 19th International Conference on Pattern Recognition (ICPR). IEEE, 2008. http://dx.doi.org/10.1109/icpr.2008.4761041.

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Diaz, Juan Pablo Marin, et Oscar Francisco Reina Hernandez. « Real Time Motion Tracking by Seismic Wave Analysis ». Dans 2007 5th International Symposium on Image and Signal Processing and Analysis. IEEE, 2007. http://dx.doi.org/10.1109/ispa.2007.4383661.

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Ben-Ezra, M., S. Peleg et M. Werman. « Real-time motion analysis with linear-programming ». Dans Proceedings of the Seventh IEEE International Conference on Computer Vision. IEEE, 1999. http://dx.doi.org/10.1109/iccv.1999.790290.

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« REAL TIME SMART SURVEILLANCE USING MOTION ANALYSIS ». Dans International Conference on Computer Vision Theory and Applications. SciTePress - Science and and Technology Publications, 2007. http://dx.doi.org/10.5220/0002052105270530.

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Nagashima, Hiroki, et Seiichiro Katsura. « Human-motion analysis of grasping/manipulating motion including time-variable function using principal component analysis ». Dans 2012 IEEE/SICE International Symposium on System Integration (SII 2012). IEEE, 2012. http://dx.doi.org/10.1109/sii.2012.6426941.

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Hojo, Hiroshi, et Nozomu Hamada. « Mouth motion analysis with space-time interest points ». Dans TENCON 2009 - 2009 IEEE Region 10 Conference. IEEE, 2009. http://dx.doi.org/10.1109/tencon.2009.5395919.

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Granum, Erik, et Henrik I. Christensen. « On Principles Of Motion Analysis In Real Time ». Dans 1988 International Congress on Optical Science and Engineering, sous la direction de Peter J. Hutzler et Andre J. Oosterlinck. SPIE, 1989. http://dx.doi.org/10.1117/12.950269.

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Maeda, Toshiyuki, Masanori Fujii et Isao Hayashi. « Sport motion picture analysis as time series data ». Dans 2014 IEEE 13th International Workshop on Advanced Motion Control (AMC). IEEE, 2014. http://dx.doi.org/10.1109/amc.2014.6823337.

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Thomas, M., C. Kambhamettu, C. A. Geiger, J. Hutchings et M. Engram. « Near-real time motion analysis for APLIS 2007 ». Dans the 15th annual ACM international symposium. New York, New York, USA : ACM Press, 2007. http://dx.doi.org/10.1145/1341012.1341032.

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Sabel, Jan C., Hans L. J. van Veenendaal et E. Hans Furnee. « PRIMAS : a real-time 3D motion-analysis system ». Dans Optical 3D Measurement Techniques II : Applications in Inspection, Quality Control, and Robotics, sous la direction de Armin Gruen et Heribert Kahmen. SPIE, 1994. http://dx.doi.org/10.1117/12.169881.

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Rapports d'organisations sur le sujet "Time-motion analysis"

Davis, Larry, et Ross Cutler. Real-Time Periodic Motion Detection, Analysis and Application. Fort Belvoir, VA : Defense Technical Information Center, juillet 1999. http://dx.doi.org/10.21236/ada391942.

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Hostick, C. J., J. C. Lavender et B. H. Wakeman. Time/motion observations and dose analysis of reactor loading, transportation, and dry unloading of an overweight truck spent fuel shipment. Office of Scientific and Technical Information (OSTI), avril 1992. http://dx.doi.org/10.2172/10142255.

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Mazzoni, Silvia, Nicholas Gregor, Linda Al Atik, Yousef Bozorgnia, David Welch et Gregory Deierlein. Probabilistic Seismic Hazard Analysis and Selecting and Scaling of Ground-Motion Records (PEER-CEA Project). Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, novembre 2020. http://dx.doi.org/10.55461/zjdn7385.

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This report is one of a series of reports documenting the methods and findings of a multi-year, multi-disciplinary project coordinated by the Pacific Earthquake Engineering Research Center (PEER) and funded by the California Earthquake Authority (CEA). The overall project is titled “Quantifying the Performance of Retrofit of Cripple Walls and Sill Anchorage in Single-Family Wood-Frame Buildings,” henceforth referred to as the “PEER–CEA Project.” The overall objective of the PEER–CEA Project is to provide scientifically based information (e.g., testing, analysis, and resulting loss models) that measure and assess the effectiveness of seismic retrofit to reduce the risk of damage and associated losses (repair costs) of wood-frame houses with cripple wall and sill anchorage deficiencies as well as retrofitted conditions that address those deficiencies. Tasks that support and inform the loss-modeling effort are: (1) collecting and summarizing existing information and results of previous research on the performance of wood-frame houses; (2) identifying construction features to characterize alternative variants of wood-frame houses; (3) characterizing earthquake hazard and ground motions at representative sites in California; (4) developing cyclic loading protocols and conducting laboratory tests of cripple wall panels, wood-frame wall subassemblies, and sill anchorages to measure and document their response (strength and stiffness) under cyclic loading; and (5) the computer modeling, simulations, and the development of loss models as informed by a workshop with claims adjustors. This report is a product of Working Group 3 (WG3), Task 3.1: Selecting and Scaling Ground-motion records. The objective of Task 3.1 is to provide suites of ground motions to be used by other working groups (WGs), especially Working Group 5: Analytical Modeling (WG5) for Simulation Studies. The ground motions used in the numerical simulations are intended to represent seismic hazard at the building site. The seismic hazard is dependent on the location of the site relative to seismic sources, the characteristics of the seismic sources in the region and the local soil conditions at the site. To achieve a proper representation of hazard across the State of California, ten sites were selected, and a site-specific probabilistic seismic hazard analysis (PSHA) was performed at each of these sites for both a soft soil (Vs30 = 270 m/sec) and a stiff soil (Vs30=760 m/sec). The PSHA used the UCERF3 seismic source model, which represents the latest seismic source model adopted by the USGS [2013] and NGA-West2 ground-motion models. The PSHA was carried out for structural periods ranging from 0.01 to 10 sec. At each site and soil class, the results from the PSHA—hazard curves, hazard deaggregation, and uniform-hazard spectra (UHS)—were extracted for a series of ten return periods, prescribed by WG5 and WG6, ranging from 15.5–2500 years. For each case (site, soil class, and return period), the UHS was used as the target spectrum for selection and modification of a suite of ground motions. Additionally, another set of target spectra based on “Conditional Spectra” (CS), which are more realistic than UHS, was developed [Baker and Lee 2018]. The Conditional Spectra are defined by the median (Conditional Mean Spectrum) and a period-dependent variance. A suite of at least 40 record pairs (horizontal) were selected and modified for each return period and target-spectrum type. Thus, for each ground-motion suite, 40 or more record pairs were selected using the deaggregation of the hazard, resulting in more than 200 record pairs per target-spectrum type at each site. The suites contained more than 40 records in case some were rejected by the modelers due to secondary characteristics; however, none were rejected, and the complete set was used. For the case of UHS as the target spectrum, the selected motions were modified (scaled) such that the average of the median spectrum (RotD50) [Boore 2010] of the ground-motion pairs follow the target spectrum closely within the period range of interest to the analysts. In communications with WG5 researchers, for ground-motion (time histories, or time series) selection and modification, a period range between 0.01–2.0 sec was selected for this specific application for the project. The duration metrics and pulse characteristics of the records were also used in the final selection of ground motions. The damping ratio for the PSHA and ground-motion target spectra was set to 5%, which is standard practice in engineering applications. For the cases where the CS was used as the target spectrum, the ground-motion suites were selected and scaled using a modified version of the conditional spectrum ground-motion selection tool (CS-GMS tool) developed by Baker and Lee [2018]. This tool selects and scales a suite of ground motions to meet both the median and the user-defined variability. This variability is defined by the relationship developed by Baker and Jayaram [2008]. The computation of CS requires a structural period for the conditional model. In collaboration with WG5 researchers, a conditioning period of 0.25 sec was selected as a representative of the fundamental mode of vibration of the buildings of interest in this study. Working Group 5 carried out a sensitivity analysis of using other conditioning periods, and the results and discussion of selection of conditioning period are reported in Section 4 of the WG5 PEER report entitled Technical Background Report for Structural Analysis and Performance Assessment. The WG3.1 report presents a summary of the selected sites, the seismic-source characterization model, and the ground-motion characterization model used in the PSHA, followed by selection and modification of suites of ground motions. The Record Sequence Number (RSN) and the associated scale factors are tabulated in the Appendices of this report, and the actual time-series files can be downloaded from the PEER Ground-motion database Portal (https://ngawest2.berkeley.edu/)(link is external).

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Law, Edward, Samuel Gan-Mor, Hazel Wetzstein et Dan Eisikowitch. Electrostatic Processes Underlying Natural and Mechanized Transfer of Pollen. United States Department of Agriculture, mai 1998. http://dx.doi.org/10.32747/1998.7613035.bard.

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The project objective was to more fully understand how the motion of pollen grains may be controlled by electrostatic forces, and to develop a reliable mechanized pollination system based upon sound electrostatic and aerodynamic principles. Theoretical and experimental analyses and computer simulation methods which investigated electrostatic aspects of natural pollen transfer by insects found that: a) actively flying honeybees accumulate ~ 23 pC average charge (93 pC max.) which elevates their bodies to ~ 47 V likely by triboelectrification, inducing ~ 10 fC of opposite charge onto nearby pollen grains, and overcoming their typically 0.3-3.9 nN detachment force resulting in non-contact electrostatic pollen transfer across a 5 mm or greater air gap from anther-to-bee, thus providing a theoretical basis for earlier experimental observations and "buzz pollination" events; b) charge-relaxation characteristics measured for flower structural components (viz., 3 ns and 25 ns time constants, respectively, for the stigma-style vs. waxy petal surfaces) ensure them to be electrically appropriate targets for electrodeposition of charged pollen grains but not differing sufficiently to facilitate electrodynamic focusing onto the stigma; c) conventional electrostatic focusing beneficially concentrates pollen-deposition electric fields onto the pistill tip by 3-fold as compared to that onto underlying flower structures; and d) pollen viability is adequately maintained following exposure to particulate charging/management fields exceeding 2 MV/m. Laboratory- and field-scale processes/prototype machines for electrostatic application of pollen were successfully developed to dispense pollen in both a dry-powder phase and in a liquid-carried phase utilizing corona, triboelectric, and induction particulate-charging methods; pollen-charge levels attained (~ 1-10 mC/kg) provide pollen-deposition forces 10-, 77-, and 100-fold greater than gravity, respectively, for such charged pollen grains subjected to a 1 kV/cm electric field. Lab and field evaluations have documented charged vs. ukncharged pollen deposition to be significantly (a = 0.01-0.05) increased by 3.9-5.6 times. Orchard trials showed initial fruit set on branches individually treated with electrostatically applied pollen to typically increase up to ~ 2-fold vs. uncharged pollen applications; however, whole-tree applications have not significantly shown similar levels of benefit and corrective measures continue. Project results thus contribute important basic knowledge and applied electrostatics technology which will provide agriculture with alternative/supplemental mechanized pollination systems as tranditional pollen-transfer vectors are further endangered by natural and man-fade factors.

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