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Literatura académica sobre el tema "Vicon system"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "Vicon system"

1

Yan, Lingyun, Guowu Wei, Zheqi Hu, Haohua Xiu, Yuyang Wei y Lei Ren. "Low-Cost Multisensor Integrated System for Online Walking Gait Detection". Journal of Sensors 2021 (14 de agosto de 2021): 1–15. http://dx.doi.org/10.1155/2021/6378514.

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A three-dimensional motion capture system is a useful tool for analysing gait patterns during walking or exercising, and it is frequently applied in biomechanical studies. However, most of them are expensive. This study designs a low-cost gait detection system with high accuracy and reliability that is an alternative method/equipment in the gait detection field to the most widely used commercial system, the virtual user concept (Vicon) system. The proposed system integrates mass-produced low-cost sensors/chips in a compact size to collect kinematic data. Furthermore, an x86 mini personal computer (PC) running at 100 Hz classifies motion data in real-time. To guarantee gait detection accuracy, the embedded gait detection algorithm adopts a multilayer perceptron (MLP) model and a rule-based calibration filter to classify kinematic data into five distinct gait events: heel-strike, foot-flat, heel-off, toe-off, and initial-swing. To evaluate performance, volunteers are requested to walk on the treadmill at a regular walking speed of 4.2 km/h while kinematic data are recorded by a low-cost system and a Vicon system simultaneously. The gait detection accuracy and relative time error are estimated by comparing the classified gait events in the study with the Vicon system as a reference. The results show that the proposed system obtains a high accuracy of 99.66% with a smaller time error (32 ms), demonstrating that it performs similarly to the Vicon system in the gait detection field.
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2

RAMBELY, A. S. y FAZROLROZI. "A SIX-LINK KINEMATIC CHAIN MODEL OF HUMAN BODY USING KANE'S METHOD". International Journal of Modern Physics: Conference Series 09 (enero de 2012): 59–67. http://dx.doi.org/10.1142/s2010194512005107.

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A biomechanics model of six-link kinematic chain of human body is developed by using Kane's method. The kinematic data comprise of six segments; foot, calf, thigh, trunk, upper arm and forearm, are obtained through data collection of walking, running and jumping using the Vicon Nexus system. The motion capture system uses 12 Vicon MX-3+ cameras and 12 Vicon MX-F40 cameras, two DV (50 Hz) cameras and a force plate (100 Hz). Inverse dynamics approach is used to obtain the unknown value of torques produced by joint segments during walking, running and jumping activities. The results show that the largest value of torques produced occurs at the foot segment.
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3

Merriaux, Pierre, Yohan Dupuis, Rémi Boutteau, Pascal Vasseur y Xavier Savatier. "A Study of Vicon System Positioning Performance". Sensors 17, n.º 7 (7 de julio de 2017): 1591. http://dx.doi.org/10.3390/s17071591.

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Gray, Aaron D., Brad W. Willis, Marjorie Skubic, Zhiyu Huo, Swithin Razu, Seth L. Sherman, Trent M. Guess et al. "Development and Validation of a Portable and Inexpensive Tool to Measure the Drop Vertical Jump Using the Microsoft Kinect V2". Sports Health: A Multidisciplinary Approach 9, n.º 6 (28 de agosto de 2017): 537–44. http://dx.doi.org/10.1177/1941738117726323.

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Background: Noncontact anterior cruciate ligament (ACL) injury in adolescent female athletes is an increasing problem. The knee-ankle separation ratio (KASR), calculated at initial contact (IC) and peak flexion (PF) during the drop vertical jump (DVJ), is a measure of dynamic knee valgus. The Microsoft Kinect V2 has shown promise as a reliable and valid marker-less motion capture device. Hypothesis: The Kinect V2 will demonstrate good to excellent correlation between KASR results at IC and PF during the DVJ, as compared with a “gold standard” Vicon motion analysis system. Study Design: Descriptive laboratory study. Level of Evidence: Level 2. Methods: Thirty-eight healthy volunteer subjects (20 male, 18 female) performed 5 DVJ trials, simultaneously measured by a Vicon MX-T40S system, 2 AMTI force platforms, and a Kinect V2 with customized software. A total of 190 jumps were completed. The KASR was calculated at IC and PF during the DVJ. The intraclass correlation coefficient (ICC) assessed the degree of KASR agreement between the Kinect and Vicon systems. Results: The ICCs of the Kinect V2 and Vicon KASR at IC and PF were 0.84 and 0.95, respectively, showing excellent agreement between the 2 measures. The Kinect V2 successfully identified the KASR at PF and IC frames in 182 of 190 trials, demonstrating 95.8% reliability. Conclusion: The Kinect V2 demonstrated excellent ICC of the KASR at IC and PF during the DVJ when compared with the Vicon system. A customized Kinect V2 software program demonstrated good reliability in identifying the KASR at IC and PF during the DVJ. Clinical Relevance: Reliable, valid, inexpensive, and efficient screening tools may improve the accessibility of motion analysis assessment of adolescent female athletes.
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Ma, Christina Zong-Hao, Yan To Ling, Queenie Tsung Kwan Shea, Li-Ke Wang, Xiao-Yun Wang y Yong-Ping Zheng. "Towards Wearable Comprehensive Capture and Analysis of Skeletal Muscle Activity during Human Locomotion". Sensors 19, n.º 1 (7 de enero de 2019): 195. http://dx.doi.org/10.3390/s19010195.

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Background: Motion capture and analyzing systems are essential for understanding locomotion. However, the existing devices are too cumbersome and can be used indoors only. A newly-developed wearable motion capture and measurement system with multiple sensors and ultrasound imaging was introduced in this study. Methods: In ten healthy participants, the changes in muscle area and activity of gastrocnemius, plantarflexion and dorsiflexion of right leg during walking were evaluated by the developed system and the Vicon system. The existence of significant changes in a gait cycle, comparison of the ankle kinetic data captured by the developed system and the Vicon system, and test-retest reliability (evaluated by the intraclass correlation coefficient, ICC) in each channel’s data captured by the developed system were examined. Results: Moderate to good test-retest reliability of various channels of the developed system (0.512 ≤ ICC ≤ 0.988, p < 0.05), significantly high correlation between the developed system and Vicon system in ankle joint angles (0.638R ≤ 0.707, p < 0.05), and significant changes in muscle activity of gastrocnemius during a gait cycle (p < 0.05) were found. Conclusion: A newly developed wearable motion capture and measurement system with ultrasound imaging that can accurately capture the motion of one leg was evaluated in this study, which paves the way towards real-time comprehensive evaluation of muscles and joint motions during different activities in both indoor and outdoor environments.
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Dorociak, R. D. y T. J. Cuddeford. "Determining 3-D system accuracy for the VICON 370 system". Gait & Posture 3, n.º 2 (junio de 1995): 88. http://dx.doi.org/10.1016/0966-6362(95)93468-r.

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Wheare, Matilda Jane, Maximillian J. Nelson, Ryan Lumsden, Alec Buttfield y Robert George Crowther. "Reliability and Validity of the Polhemus Liberty System for Upper Body Segment and Joint Angular Kinematics of Elite Golfers". Sensors 21, n.º 13 (24 de junio de 2021): 4330. http://dx.doi.org/10.3390/s21134330.

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Golf swing analysis is common in both recreational and professional levels where players are searching for improvements in shot accuracy and distance. The use of motion analysis systems such as the portable Polhemus Liberty system is gaining interest by coaches and players; however, to date, no research has examined the usefulness of the Polhemus Liberty system for golf swing analysis. Therefore, the purpose of this study was to determine the reliability of the Polhemus Liberty system and validity compared to the VICON Nexus motion analysis system when assessing segment (pelvis and thorax) and joint (shoulder, elbow and wrist) angular kinematics during a golf swing at key events (address, top of backswing and impact). Fifteen elite amateur/professional golfers performed ten golf swing trials within specified bounds using their 5-iron club. Reliability was assessed using interclass coefficient, effect size and t-test statistics by all participants completing two separate testing sessions on separate days following the same experimental protocol. Validity was assessed using effect size, Pearson correlation and t-test statistics by comparing swings captured using both Polhemus Liberty and VICON Nexus concurrently. Results demonstrated no difference in ball outcome results using the Trackman launch monitor (P > 0.05) and that the Polhemus Liberty system was reliable across the two sessions for all segment (pelvis and thorax) and joint (lead shoulder (gleno-humeral joint), elbow and wrist) angular kinematics (P > 0.05). Validity analysis showed that the Polhemus Liberty system for the segments (pelvis and thorax) and joints (lead shoulder and wrist) were different compared to the VICON Nexus data at key events during the golf swing. Although validity could not be confirmed against VICON Nexus modeling, the Polhemus Liberty system may still be useful for golf swing analysis across training sessions. However, caution should be applied when comparing data from the system to published research data using different motion analysis methods.
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van der Veen, Susanne, Martine Bordeleau, Peter Pidcoe, Christopher France y James Thomas. "Agreement Analysis between Vive and Vicon Systems to Monitor Lumbar Postural Changes". Sensors 19, n.º 17 (21 de agosto de 2019): 3632. http://dx.doi.org/10.3390/s19173632.

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Immersive virtual reality has recently developed into a readily available system that allows for full-body tracking. Can this affordable system be used for component tracking to advance or replace expensive kinematic systems for motion analysis in the clinic? The aim of this study was to assess the accuracy of position and orientation measures from Vive wireless body trackers when compared to Vicon optoelectronic tracked markers attached to (1) a robot simulating trunk flexion and rotation by repeatedly moving to know locations, and (2) healthy adults playing virtual reality games necessitating significant trunk displacements. The comparison of both systems showed component tracking with Vive trackers is accurate within 0.68 ± 0.32 cm translationally and 1.64 ± 0.18° rotationally when compared with a three-dimensional motion capture system. No significant differences between Vive trackers and Vicon systems were found suggesting the Vive wireless sensors can be used to accurately track joint motion for clinical and research data.
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Stevens, Tom G. A., Cornelis J. de Ruiter, Cas van Niel, Roxanne van de Rhee, Peter J. Beek y Geert J. P. Savelsbergh. "Measuring Acceleration and Deceleration in Soccer-Specific Movements Using a Local Position Measurement (LPM) System". International Journal of Sports Physiology and Performance 9, n.º 3 (mayo de 2014): 446–56. http://dx.doi.org/10.1123/ijspp.2013-0340.

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Purpose:A local position measurement (LPM) system can accurately track the distance covered and the average speed of whole-body movements. However, for the quantification of a soccer player’s workload, accelerations rather than positions or speeds are essential. The main purpose of the current study was therefore to determine the accuracy of LPM in measuring average and peak accelerations for a broad range of (maximal) soccerspecific movements.Methods:Twelve male amateur soccer players performed 8 movements (categorized in straight runs and runs involving a sudden change in direction of 90° or 180°) at 3 intensities (jog, submaximal, maximal). Position-related parameters recorded with LPM were compared with Vicon motion-analysis data sampled at 100 Hz. The differences between LPM and Vicon data were expressed as percentage of the Vicon data.Results:LPM provided reasonably accurate measurements for distance, average speed, and peak speed (differences within 2% across all movements and intensities). For average acceleration and deceleration, absolute bias and 95% limits of agreement were 0.01 ± 0.36 m/s2 and 0.02 ± 0.38 m/s2, respectively. On average, peak acceleration was overestimated (0.48 ± 1.27 m/s2) by LPM, while peak deceleration was underestimated (0.32 ± 1.17 m/s2).Conclusion:LPM accuracy appears acceptable for most measurements of average acceleration and deceleration, but for peak acceleration and deceleration accuracy is limited. However, when these error margins are kept in mind, the system may be used in practice for quantifying average accelerations and parameters such as summed accelerations or time spent in acceleration zones.
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Scoz, Robson Dias, Thiago Roberto Espindola, Mateus Freitas Santiago, Paulo Rui de Oliveira, Bruno Mazziotti Oliveira Alves, Luciano Maia Alves Ferreira y César Ferreira Amorim. "Validation of a 3D Camera System for Cycling Analysis". Sensors 21, n.º 13 (30 de junio de 2021): 4473. http://dx.doi.org/10.3390/s21134473.

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Background: Kinematic analysis aimed toward scientific investigation or professional purposes is commonly unaffordable and complex to use. Objective: The purpose of this study was to verify concurrent validation between a cycling-specific 3D camera and the gold-standard 3D general camera systems. Methods: Overall, 11 healthy amateur male triathletes were filmed riding their bicycles with Vicon 3D cameras and the Retul 3D cameras for bike fitting analysis simultaneously. All 18 kinematic measurements given by the bike fitting system were compared with the same data given by Vicon cameras through Pearson correlation (r), intraclass correlation coefficients (ICC), standard error measurements (SEM), and Bland–Altman (BA) analysis. Confidence intervals of 95% are given. Results: A very high correlation between cameras was found on six of 18 measurements. All other presented a high correlation between cameras (between 0.7 and 0.9). In total, six variables indicate a SEM of less than one degree between systems. Only two variables indicate a SEM higher than two degrees between camera systems. Overall, four measures indicate bias tendency according to BA. Conclusions: The cycling-specific led-emitting 3D camera system tested revealed a high or very high degree of correlation with the gold-standard 3D camera system used in laboratory motion capture. In total, 14 measurements of this equipment could be used in sports medicine clinical practice and even by researchers of cycling studies.
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Tesis sobre el tema "Vicon system"

1

Grubisic, Ivan. "ALGORITHMS FOR CALCULATING THE 3D CENTER OF ROTATION USING VICON MOTION CAPTURE SYSTEM AND MATLAB". Thesis, The University of Arizona, 2009. http://hdl.handle.net/10150/192460.

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Húsková, Michaela. "Pokročilá analýza signálů z laboratoře chůze". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400991.

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The aim of the thesis is a realization of advanced analysis of signals from gait laboratory. The introductory part deals with the gait cycle and its relation to the joints kinematic is discussed. Additionally, the work is focused on the description of the gait laboratory and the definition of the indexes in order to quantify patient´s overall gait in kinematic analysis. In the practical part, kinematic data analysis was implemented in the MATLAB environment and the results of healthy individuals and patients with cerebral palsy were compared. Kinematic analysis included peak detection in specific kinematic variables. In the last part a graphical user interface for visualization was implemented.
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3

Rahman, Promi y Karolina Lazarz. "Shoulder Abduction and Flexion Movements Measured with the Force Range Monitor - A Validation Study". Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297860.

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The life expectancy of the elderly population is expected to increase with 22 % by 2050. As one grows older, the body starts to deteriorate, which can lead to a higher risk for diseases and accidents. During recent years shoulder surgeries have increased dramatically, and to assess the shoulder function the most common technique is the use of camera-based motion capture systems. However, this is very time consuming and does not completely represent the real shoulder performance. Therefore, this study was aimed to validate a new technique, the force range monitor (FRM). Thirteen volunteers participated in this study, which was divided into two sessions. Session one included abduction and flexion strength measurements using the FRM, as well as six mobility measurements with the inertial measurement unit (IMU) of the FRM. The second session was conducted in the same manner, with the addition of the Vicon system (motion capture system). In this study a control session for FRM and the Vicon system was also performed for abduction and flexion movements with two participants, where the placement of the IMU was modified. As indicated by the results, FRM and the Vicon system do not measure the same parameters. Even if the FRM does not measure the same shoulder joint angles as the Vicon System, the FRM can still be of clinical importance when evaluating position deviation during strength and mobility measurements. Moreover, the FRM had a high repeatability for a number of participants, and most of the mobility measurements presented a distinct patterns for various activities. Hence, it can be concluded that the FRM is a potential technique to evaluate shoulder strength and mobility.
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4

Stubbe, Laurent. "Etude des micromouvements physiologiques objectivés par un système optoélectronique : Application à la ventilation et influence sur les micromouvements crâniens". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASW003.

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La mesure des variations de la conformation du crâne revêt un intérêt dans différents domaines cliniques. L’objectif de la thèse est d’évaluer les micromouvements du crâne à l’aide d’un outil non invasif.La mesure de la fréquence respiratoire issue des variations du volume thoracique à l’aide du système Vicon est comparée aux mesures de spiromètre et d’ECG. Les résultats montrent que le système Vicon permet d’enregistrer la fréquence respiratoire à partir de 12 marqueurs rétro-réfléchissants situés sur la paroi antéro-inférieure du thorax. Les données sont très fortement corrélées (r=1) et montrent une parfaite concordance avec les limites d'agrément = 8*10-4 Hz.Les changements de conformation du crâne mesurés avec le Vicon en utilisant la fréquence respiratoire contrôlée sont étudiés. Les micromouvements sont corrélés avec la mesure du volume sous pectoral (r=1). La mesure du pic de fréquence respiratoire au niveau du crâne concorde avec la mesure du volume sous pectoral pour TLAD-TLAG, on obtient un biais = -2,5*10-4 Hz et pour l’AngleLat= -4,5*10-4 Hz.Les paramètres crâniens sont comparés et hiérarchisés dans le but d’identifier une variable représentative du phénomène. Une analyse en composante principale permet d’identifier l’AngleLat comme coefficient associé à la composante représentative de 61 % de la variance explicative.Enfin, Les paramètres ont fait l’objet d’une analyse dans le domaine fréquentiel à travers le concept de cohérence puis dans le domaine temporel à travers la méthode des corrélations croisées. Il y a une bonne corrélation des variations d’angles droit et gauche. La durée des acquisitions a un impact sur la variation du délai et peu sur la corrélation. Le paramètre le moins corrélé aux autres est la variation du volume thoracique. L’analyse de la cohérence confirme ces résultats.Les résultats montrent que l’analyse les micromouvements du crâne est possible de manière non invasive, de faire évoluer le modèle pédagogique ostéopathique, d’évaluer en routine clinique les modifications de pression intracrânienne
Variations assesment in skull’conformation is of interest in various clinical fields. The main prupose of the thesis is to estimate skull’s micromovements using a non-invasive tool.Respiratory rate assesement by monitoring lower chest volume’s variations using the Vicon optoelectronic system is compared to spirometer and ECG monitoring. The results show that the Vicon system records accuratly the respiratory rate signal from 12 retro-reflective markers located on the anteroinferior wall of the thorax. The data are very strongly correlated (r=1) and show a perfect agreement with a limits of agreement = 8*10-4 Hz.Skull conformation changes assesed by Vicon system using controlled respiratory rate are investigated. Micro-movements are correlated with the measurement of the sub-pectoral volume (r = 1). The measurement of the peak respiratory rate at the level of the skull agrees with the measurement of the sub-pectoral volume for TLAD-TLAG obtained a bias = -2.5*10-4 Hz and for the AngleLat= -4.5*10- 4 Hz.The cranial parameters are compared and ranked in order to identify a variable representative of the phenomenon. A principal component analysis predicts AngleLat as the coefficient associated with the principal component representative of 61% of the explanatory variance.Finally, the parameters were analyzed in the frequency domain through the concept of coherence and then in the time domain through cross-correlations method. There is a good correlation between right and left angle variations. The duration of acquisitions has an impact on the variation of the delay and little on the correlation coefficient. The parameter the least correlated with the others is the variation of the thoracic volume. The coherence analysis confirms these results.The results of this work show that it is possible to analyze the micromovements of the skull in a non-invasive way, to develop the osteopathic educational model, to evaluate changes in intracranial pressure in routine clinical practice
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5

Hanson, Andrew Todd. "Markerless Motion Capture and Analysis System to Enhance Exercise Professional Effectiveness: Preliminary Study". University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1481223866357858.

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6

Fourie, Sarie Marissa. "3D measurement of cervical and thoracic postural dynamism in sitting : a pilot study". Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85712.

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Thesis (MScPhysio)--Stellenbosch University, 2013.
ENGLISH ABSTRACT: The aim of this study was to improve the measurement of postural dynamism in the sitting position using a three-dimensional (3D) motion analysis system. The primary objective was to describe pilot data for postural dynamism of the cervical and thoracic spines while working at a desktop computer. The secondary objective was to refine the process of posture measurement and analysis by decreasing data processing time. Certain factors in 3D motion analysis can lead to an increase in gaps in data collected during trial capture, which in turn will lead to a longer time of data processing. In the first phase of this study, a number of such factors were identified and altered. A series of pilot studies was performed to test the improvement of data processing time when altering these factors. In the first two pilot studies, camera and tripod positionings were explored and refined, workstation layout and anatomical landmark marker placement were investigated, and optimal capture frequency was established. In both these pilot studies, outcomes were established by means of trial and error by experimenting with a variety of different options for the different outcomes. In the third pilot study, computer software which provides computer tasks for the participant during primary trial capture was tested. Two independent computer users performed all the activities as per software, after which they were required to give oral feedback and suggestions on improvement in terms of user friendliness. The objective of the fourth and final pilot study was to include all of the outcomes from the preceeding pilot studies and attempt a trial run of the actual data collection process. A study participant with no affiliation to the research project was used and a complete trial run was performed after which the measurement process was deemed feasible. In the primary study, 18 student volunteers completed a sequence of computer tasks, including keyboard, mouse and reading activities. Prior to data capture, full range of motion of the thoracic and cervical spines were measured in three dimensions for every participant. Data capture took place for the full duration of performance of all computer activities. Outcome parameters for postural dynamism included true range of motion (degrees), proportional range of motion (percentage) and motion frequency (movement per minute) in all three planes of motion of the cervical and thoracic spines. Typing tasks were associated with biggest movement ranges and motion frequencies. Mouse activity was associated with the most stationary posture, exhibiting the least frequent movement as well as the smallest ranges of motion. The results from this study allow us to better understand the dynamic nature of posture, as well as postural dynamism associated with different computer tasks. This study provides a baseline for future research of 3D motion analysis of the sitting posture. It also marks the need for further research regarding ergonomics, use and potential alternatives in the computer workstation and input devices.
AFRIKAANSE OPSOMMING: Hierdie studie het ten doel gehad om die meting van posturale dinamisme in die sitposisie te verbeter deur middel van „n drie-dimensionele (3D) bewegingsanalisesisteem. Die primêre doelwit was om loodsdata te beskryf vir posturale dinamisme van die servikale en torakale werwelkolomme terwyl op „n rekenaar gewerk word. Die sekondêre doelwit was om die proses van postuurmeting en analise te verfyn deur die dataprosesseringstyd te verminder. Sekere faktore van 3D bewegingsanalise kan „n vermeerdering van gapings in ingesamelde data tot gevolg hê, wat weer kan lei na „n verlengde tydperiode van dataprosessering. In die eerste fase van hierdie studie is sulke faktore identifiseer en aangepas. „n Reeks loodsstudies is uitgevoer om die verbetering van dataprosesseringstyd te toets namate aanpassings aan hierdie faktore gemaak is. Tydens die eerste twee loodsstudies is verskillende kamera en driepoot posisionering ondersoek en verfyn, werkstasie uitleg en anatomiese baken merker plasing is ondersoek en die optimale dataversamelingsfrekwensie is vasgestel. In beide hierdie loodsstudies is die uitkomste vasgestel op grond van toets- en fouteer deur te eksperimenteer met „n verskeidenheid opsies soos van toepassing op die betrokke uitkomste. Tydens die derde loodsstudie is rekenaarsagteware getoets wat die rekenaaraktiwiteit vir die studiedeelnemers verskaf het tydens primêre data-insameling. Twee onafhanklike persone het al die aktiwiteite volgens die sagteware voltooi en het verbale terugvoer en aanbevelings gegee oor hoe om die program te verbeter. Die vierdie en finale loodsstudie het gepoog om al die uitkomste van die eerste drie loodsstudies in te sluit en „n toetsmeting te doen van die ware dataversamelingsproses. „n Onafhanklike studiedeelnemer met geen affiliasie tot die navorsingsprojek nie het „n toetslopie van die hele versamelingsproses gedoen en die metingsproses is haalbaar verklaar. Tydens die primêre studie het 18 student-vrywilligers „n reeks rekenaartake gedoen (insluitend sleutelbord en muisaktiwiteite sowel as „n leesopdrag). Voor die aanvang van dataversameling is die volle bewegingsomvange van die torakale en servikale werwelkolomme van elke deelnemer gemeet. Dataversameling is vir die volle durasie van die uitvoer van rekenaaraktiwiteite gedoen. Uitkomsparameters vir posturale dinamisme het die volgende ingesluit: Omvang van beweging (grade), proporsionele omvang van beweging (persentasie) en bewegingsfrekwensie (bewegings per minuut) in al drie bewegingsvlakke van die servikale en torakale werwelkolomme. Sleutelbord-aktiwiteite is geässosieer met die grootste bewegingsomvange en die meeste bewegingsfrekwensie. Muisaktiwiteit is geässosieer met die mees stasionêre postuur en het die heel minste gereelde beweging getoon in die algemeen. Die resultate van hierdie studie help om die dinamise natuur van postuur beter te verstaan, sowel as posturale dinamisme wat met verskillende rekenaartake verbind word. Die studie bied „n basislyn vir die toekomstige navorsings wat posturale dinamisme met verskillende rekenaartake meet. Dit merk ook die behoefte aan verdere navorsing aangaande ergonomika, gebruik en alternatiewe tot rekenaarwerkstasie en –toerusting.
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7

Civek, Ezgi. "Comparison of kinematic results between metu-kiss and ankara university-vicon gait analysis systems". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607976/index.pdf.

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KISS (Kinematic Support System) is a locally developed gait analysis system at Middle East Technical University (METU), and the performance of the system was evaluated before as a whole. However, such evaluations do not differentiate between the efficacy of the data acquisition system and the model-based gait analysis methodology. In this thesis, kinematic results of the KISS system will be compared with those of the Ankara University based commercial VICON (Oxford Metrics Ltd., Oxford, UK) system, in view of evaluating the performance of data acquisition system and the gait analysis methodology separately. This study is expected to provide guidelines for future developments on the KISS system.
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8

Thom, Michael. "The mating system and behavioural ecology of American mink (Mustela vison)". Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249283.

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Ntoumi, Francine. "Effets des jours courts ou d'implants de melatonine sur le systeme a gnrh et la secretion des hormones gonadotropes chez le vison male (mustela vison)". Paris 6, 1993. http://www.theses.fr/1993PA066676.

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Le vison (mustela vison) est un mammifere a reproduction saisonniere dont l'axe hypothalamo-hypophysaire est stimule par la diminution des jours a partir du solstice d'ete. Nous avons entrepris, l'etude immunocytochimique du systeme a gnrh et la secretion des hormones gonadotropes par ria. Des coupes frontales seriees observees depuis les tubercules olfactifs jusqu'a la tige hypophysaire ont permis la localisation et le denombrement des neurones immunoreactifs au gnrh. Dans la premiere partie realisee chez la femelle, nous avons localise les neurones a gnrh dans les tubercules olfactifs, les bandes diagonales de broca, le septum, l'aire preoptique et hypothalamique anterieure et principalement dans l'hypothalamus mediobasal. Le nombre total de neurones varie au cours de l'annee avec un minimum en juillet et un maximum en decembre. Dans une deuxieme partie, sous l'action des jours courts ou de la melatonine, le nombre de neurones immunoreactifs de l'aire preoptique et de l'hypothalamus mediobasal, les concentrations seriques de fsh augmentent. Aucun effet n'est observe sur les concentrations seriques de lh. Dans la derniere partie, chez le male castre, la melatonine induit une augmentation de la secretion de fsh. En conclusion, l'axe hypothalamo-hypophysaire est plus sensible au retrocontrole de la testosterone en jours longs qu'en jours courts
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Bonnefond, Catherine. "Melatonine et transmission de l'information photoperiodique chez le vison et le hamster dore". Paris 6, 1988. http://www.theses.fr/1988PA066626.

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Libros sobre el tema "Vicon system"

1

Erny, Nicola. Theorie und System der Neuen Wissenschaft von Giambattista Vico: Eine Untersuchung zu Konzeption und Begründung. Würzburg: Königshausen und Neumann, 1994.

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Aerotech 4: Airborne Sensors and Systems : Vicon 2000 (C03984). Amer Society of Mechanical, 1991.

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Wilkinson, David O. Comparative Civilizations. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190846626.013.125.

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The study of comparative civilization raises a variety of questions; for example, how “civilization” is related to “culture,” what criteria shall be used to distinguish one civilization from another, or whether the past of civilizations can tell us anything about the future of our global civilization. One way to approach these elements of the comparative-civilizational problematique is by analyzing the successive theses of notable workers in the field, from Herodotus of Halicarnassus and Marco Polo to Garcilaso Inca de la Vega, Ibn Khaldun, Giambattista Vico, and Georg Wilhelm Friedrich Hegel. The works of Hegel and four other scholars—Nikolai Danilevsky, Oswald Spengler, Arnold Toynbee, and Pitirim Sorokin—are considered classics in the study of macrosocial systems. More recent studies of macrosocial systems that deserve consideration are those by André Gunder Frank and Barry Gills; Christopher Chase-Dunn and Thomas Hall; Carroll Quigley; Matthew Melko; and Samuel P. Huntington. The “civilizations” and “world-systems” approaches to macrosocieties are both strongly concerned to explain political conditions like hegemony and rivalry, general war, and general peace. Thus, it would be useful to concentrate on the political–military–diplomatic foci of both approaches. A key to making comparative-civilizational research more systematic is to identify the spatio-temporal boundaries of civilizations as complex systems with particular locations in space and time.
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Guido, Cimarella Claudio, Gruppo Giurinform studio y Italy. Corte suprema di cassazione. Centro elettronico di documentazione., eds. Dottrina e giurisprudenza: L'integrazione informatica : atti del convegno, Vico Equensi, Grand Hotel Moon Valley, 5-7 aprile 1990. Milano: Giuffrè, 1994.

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Capítulos de libros sobre el tema "Vicon system"

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Yu, Yangguang, Zhihong Liu y Xiangke Wang. "An Introduction to Formation Control of UAV with Vicon System". En 2nd EAI International Conference on Robotic Sensor Networks, 181–90. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17763-8_17.

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Pellatt, Lloyd, Alex Dewar, Andrew Philippides y Daniel Roggen. "Mapping Vicon Motion Tracking to 6-Axis IMU Data for Wearable Activity Recognition". En Smart Innovation, Systems and Technologies, 3–20. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8944-7_1.

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Hays, C., S. Fehr, XC Liu y R. Haddas. "Impact of corset bracing on 3D spine kinematics during ADL in children with Spondylolysis". En Studies in Health Technology and Informatics. IOS Press, 2021. http://dx.doi.org/10.3233/shti210450.

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Spondylolysis is a stress fracture of the vertebral pars interarticularis that frequently affects adolescents involved in sports. Conservative bracing methods may assist the clinician in treating spondylolysis, though there is a need to further validate these techniques. The goal of this study was to evaluate differences in the 3D movements of the thoracic and lumbar spine before and after bracing. Five patients (mean age 14.4 ± 1.3 years) with spondylogenic back pain were evaluated for kinematic measurements using a Vicon motion capture system. Patients performed activities both with and without a lumbar corset brace including walking, kneeling, standing from a chair, standing from the floor, ascending and descending stairs, and lifting. Patients were evaluated for differences in thoracic and lumbar range of motion (ROM) in the braced and unbraced condition. While wearing the brace, patients demonstrated reduced extension ROM of the thoracic spine while walking (mean reduction = 0.4°), ascending stairs (3.0°), descending stairs (2.1°), lifting (14.8°), standing from a chair (4.1°), standing from the floor (16.7°), and kneeling (8.4°). Patients also exhibited reduced extension ROM of the total lumbar spine while ascending stairs (mean reduction = 1.8°), lifting (12.7°), standing from a chair (9.5°), standing from the floor (11.8°), and kneeling (4.7°). These results provide evidence that bracing reduces stress on the pars interarticularis and relieves symptoms in the athlete with spondylogenic back pain, thereby facilitating a return to sports.
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Ahad, Md Atiqur Rahman. "Vision and Sensor-Based Human Activity Recognition". En Advances in Systems Analysis, Software Engineering, and High Performance Computing, 17–35. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2584-5.ch002.

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Human action or activity or behavior analysis, recognition, and understanding are very important research areas in the field of computer vison, internet of things (IoT) sensor-based analysis, human-computer interaction (HCI), affective computing, intelligent system, healthcare facilities, and so on. There is much importance in human action recognition. This chapter introduces the core aspects of human action or activity recognition (HAR). These are split into two different domains: computer vision-based action/activity recognition, action localization, etc.; and wearable IoT sensor-based HAR. Though cameras are also sensors that provide vision-based information, the author puts camera-based or vision-based methods in another category. The chapter introduces core challenges and strategies to move forward.
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Tran, Khanh Quoc, Phap Ngoc Trinh, Khoa Nguyen-Anh Tran, An Tran-Hoai Le, Luan Van Ha y Kiet Van Nguyen. "An Empirical Investigation of Online News Classification on an Open-Domain, Large-Scale and High-Quality Dataset in Vietnamese". En Frontiers in Artificial Intelligence and Applications. IOS Press, 2021. http://dx.doi.org/10.3233/faia210036.

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In this paper, we build a new dataset UIT-ViON (Vietnamese Online Newspaper) collected from well-known online newspapers in Vietnamese. We collect, process, and create the dataset, then experiment with different machine learning models. In particular, we propose an open-domain, large-scale, and high-quality dataset consisting of 260,000 textual data points annotated with multiple labels for evaluating Vietnamese short text classification. In addition, we present the proposed approach using transformer-based learning (PhoBERT) for Vietnamese short text classification on the dataset, which outperforms traditional machine learning (Naive Bayes and Logistic Regression) and deep learning (Text-CNN and LSTM). As a result, the proposed approach achieves the F1-score of 80.62%. This is a positive result and a premise for developing an automatic news classification system. The study is proposed to significantly save time, costs, and human resources and make it easier for readers to find news related to their interesting topics. In future, we will propose solutions to improve the quality of the dataset and improve the performance of classification models.
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Ling, Roger y Lesley Ling. "Postscript to Volume I". En The Insula of the Menander at Pompeii. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780199266951.003.0015.

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We take the opportunity of modifying ideas presented in Volume I, and responding to queries raised by reviewers and other commentators. 1. Street fountains. It was claimed in Volume I (p. 252) that the cutting back of the fac¸ade of I.10.1 to create space round the fountain was almost without parallel in the city: the only other places where we could point to similar sacrifices being made, either for fountains or for the distribution tanks and watertowers which were an integral part of the distribution system provided to feed them, were at the southern tip of Insula VI.1 and the south-east corner of VI.14. We suggested, therefore, that the owner or occupier of I.10.1, rather than being subject to an expropriation order, may have yielded the space voluntarily. It is certainly true that street fountains and water-towers were as far as possible sited to avoid impinging upon existing buildings, even though the installations in question almost invariably ended up both encroaching upon the sidewalk and projecting into the carriageway. In some cases, as at the northeast corner of VI.8, there was no great problem, because there was suficient space for pedestrians and wheeled trafic to get past without dificulty. In other places, the street was closed to vehicles, so the fountain could project freely into the carriageway or even stand wholly within it: such was the case at the north-west corner of VI.13, where the lack of ruts and a strategically placed bollard at the south end conform that the Vico del Labirinto was for pedestrians only. The western stretch of the Via dell’Abbondanza, between the forum and the Via Stabiana crossing, was at least partially closed to vehicles, but there was, in any case, no shortage of space for the fountains at the south-east corners of VII.9 and VII.14. At the north end of the Via delle Scuole, closed off by the forum colonnade, it was even possible to site a fountain in the middle of the road. In other cases, however, accommodating the fountain presented serious difficulties. At the south-east corner of VII.4, for instance, the fountain jutted into the street so far as to leave only a narrow gap for wheeled trafic to squeeze through, and ultimately the street was closed.
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"(22) NILSSON, C. (1982). Dust investigations in pig houses. Swedish Uni­ versity of Agricultural Sciences, Department of Farm Buildings, Di-vison of Farm Building Constructions, Lund. Rapport 25, pp 93. (23) HILLIGER, H.G. (1966). Gravimetrische Staubmessungen in Stallen. Zbl. Vet. Med. B, 13, 698-708. (24) PALOHEIMO, L.T1969). Weender Analyse. In: W. LEMKEIT, K. BREIREM and E. GRASSMANN (Hrsg.). Handbuch der Tierernahrung, Bd. 1, S.164-171, Verlag Parey, Berlin, Hamburg. (25) HELEN, M. (1984). Einige Ursachen fUr die Variationen der Staubkon-zentration im Mastschweinestal1. In: Symposium der Internationalen Gesellschaft fUr Tierhygiene, Hrsg.: Deutsche Veterinarmedizinische GeselIschaft, 28-30. (26) NAKAUE, H.S., J.K. KOELLIKER, D.R. BUHLER and G.H. ARSCOTT (1981). Distribution of inorganic elements in poultry house dust. Poultry Sci. 60, 1386-1391. (27) CERMAK, J.P. and P.A. ROSS (1978). Airborne dust concentrations as­ sociated with animal housing tasks. Farm Buildg. Progr. 5J_, 11-15. (28) BUNDY, D.S. and E.T. HAZEN (1975). Dust levels in swine confinement systems associated with different feeding methods. Trans. Amer. Soc. Agric. Eng. J8, 137-139. (29) SCHAEFER, J., J.M.H. BEMELMANS and M.C. Ten NOEVER DE BRAUW (1974). Onderzoek naar de voor de stank van varkensmesterijen verantwoordi-lijke componenten. Landbouwkund. Tijdschr., pt 86-9, 228-232. (30) HAMMOND, E.G., C. FEDLER and G. JUNK (1979). Identification of dust-borne odors in swine confinement facilities. Trans. ASAE 22, No. 5, 1186-1189 & 1192. (31) TRAVIS, T.A. and L.F. ELLIOTT (1977). Quantitation of indole and scatole in a housed swine unit. J. Environ. Qual. 6 (34) HARTUNG, J. (1985). Gas chromatographic investigations of swine house dust on odorous compounds. Environmental Technology Letters 6, 21-30. (35) SPOELSTRA, S.F. (1978). Microbial aspects of the formation of malo­ dorous compounds in anaerobically stored piggery wastes. Wageningen, Landbouwhogeschool, Diss., pp. 91. (36) SCHAEFER, J. (1977). Sampling, characterization and analysis of mal-odours. Agric. Environm. 3, 121-127. (37) HARTUNG, J. and E. R0KICK.T (1984). Zum Vorkommen phenol art iger Ver-bindungen im Staub von Schweine- und HUhnerstall. Zbl. Bakt. Hyg., I. Abt. Orig. B, J_79, 431-439. (38) LOGTENBERG, M.Th. and B. STORK (1976). Het ontwikkelen van meetme-thoden voor het bepalen van de stank van ventilatielucht van mest-varkensstallen.Rapport de Centraal Technisch Instituut TNO, Zeist/ Holland. Ref.no: 76-06 054, Dossier: 01-4-40130. (39) WILLSON, G.B. (1971). Control of odours from poultry houses. ASAE Symp. Livestock Waste Management, Columbus/Ohio, 19.-22.4.1971. (40) HAMMOND, E.G., C. FEDLER and R.J. SMITH (1981). Analysis of particle -borne swine house odours. Agric. and Environment 6, 395-399. (41) OWEN, J.E. (1982b). Dust - Filtration solutions an? their cost. Farm Building Progress 68, 19-23." En Odour Prevention and Control of Organic Sludge and Livestock Farming, 340. CRC Press, 1986. http://dx.doi.org/10.1201/9781482286311-134.

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Actas de conferencias sobre el tema "Vicon system"

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Harris, R. G. "Reconnaissance Sensor Management System - Vicon 2000". En 32nd Annual Technical Symposium, editado por Paul A. Henkel, Francis R. LaGesse y Wayne W. Schurter. SPIE, 1989. http://dx.doi.org/10.1117/12.948610.

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Tang, Qiu, Chenxiao Cai y Lei Ma. "An Improved Formation Control Algorithm in Vicon 3D Motion Capture System". En 2016 International Conference on Energy, Power and Electrical Engineering. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/epee-16.2016.60.

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Barzilay, O. y A. Wolf. "A Virtual Adaptive Biofeedback System for Neuromuscular Rehabilitation". En ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59363.

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The purpose of this research is to enhance the methods used in biomechanical rehabilitation by combining virtual reality, motion capture and biofeedback instrumentation. During training the subject is wearing a head-mounted helmet, in which virtual tasks (i.e. motions) are displayed to him. During training, the patient is asked to follow target motions which are displayed to him and match his own movement to them. During training the patient kinematics and electromyograms (E.M.G.) signals are being tracked by Vicon Motion tracking system. We use an intelligent learning system to learn, on-line patient performance. For training, we use kinematics and electromyogram data provided by the Vicon motion system. Once trained, the system changes and adapts the tasked displayed to the subject for better patient-specific neuromuscular rehabilitation. Moreover, the system creates a more entertaining environment also resulting in a more efficient physiotherapy in adults and especially in pediatric. Besides physiotherapy, this system can be used in other applications, such as performance enhancement in sports training and as an educational tool in any application requiring precise movement and coordination.
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Bai, Yahui, Huimin Hu, Yinxia Li, Chaoyi Zhao, Ling Luo y Rui Wang. "Research Methods for Human Activity Space Based on Vicon Motion Capture System". En 2017 5th International Conference on Enterprise Systems (ES). IEEE, 2017. http://dx.doi.org/10.1109/es.2017.40.

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Al Habsi, Shaima, Maha Shehada, Marwah Abdoon, Ahmed Mashood y Hassan Noura. "Integration of a Vicon camera system for indoor flight of a Parrot AR Drone". En 2015 10th International Symposium on Mechatronics and its Applications (ISMA). IEEE, 2015. http://dx.doi.org/10.1109/isma.2015.7373476.

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Dongo, Ricardo, Miguel Moscoso, Rocio Callupe, Jessica Pajaya y Dante Elias. "Normal human gait patterns in Peruvian individuals: an exploratory assessment using VICON motion capture system". En 13th International Symposium on Medical Information Processing and Analysis, editado por Jorge Brieva, Juan David García, Natasha Lepore y Eduardo Romero. SPIE, 2017. http://dx.doi.org/10.1117/12.2285978.

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Bailey, Stephen W. y Bobby Bodenheimer. "A comparison of motion capture data recorded from a Vicon system and a Microsoft Kinect sensor". En the ACM Symposium. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2338676.2338703.

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Tran, Truong X., Chang-kwon Kang y Shannon L. Mathis. "Lower-Gait Tracking Mobile Application: A Case Study of Lower body Motion Capture Comparison Between Vicon T40 System and Apple Augmented Reality". En 2020 IEEE International Conference on Bioinformatics and Biomedicine (BIBM). IEEE, 2020. http://dx.doi.org/10.1109/bibm49941.2020.9313201.

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Galarza, Jose y Dumitru I. Caruntu. "Effect of Additional Weight on Human Squat Exercise Stability: Ground Reaction Forces and Centers of Pressure". En ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3216.

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Abstract The main focus of this work is to investigate the effect of weight on the stability of human squat exercise. The squat exercise is a common daily activity. Experiments are conducted using one human subject. A VICON motion analysis system integrated with Force Plates is utilized for these experiments. An experimental protocol is developed and followed. This work analyzes the time series of the normal component of the ground reaction forces and each coordinate of the center of pressure. These time series are used to estimate the Lyapunov Exponents using Rosenstein method. MATLAB software package is used for this investigation. The results of this work are compared with results from literature. Present work gives more information relating the safety of the squat exercise when adding additional weight. One can see that the effect of additional weight on stability depends on its value. In the cases of small and moderate additional weight the stability is the same or increases, while for the largest additional weight the investigated stability decreases.
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Ghosh, Shramana, Hyosang Moon y Nina P. Robson. "Reconstructing Humans’ Hand Motion: Preliminary Results and Applications in the Design of Mechanical Fingers for Anthropomorphic Tasks". En ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-13700.

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This paper reports the development of a low-cost sensor-based glove device using commercially available components that can be used to obtain position, velocity and acceleration data for individual fingers of the hand. Optical tracking of the human hand and finger motion is a challenging task due to the large number of degrees of freedom (DOFs) packed in a relatively small space. We propose methods to simplify the hand motion capture by utilizing accelerometers and adopting a reduced marker protocol. The preliminary results show that the use of relative position, velocity and acceleration homogeneous transformations enable us in getting improved finger motion data with respect to those obtained from a Vicon system. This data is directly related to contact and curvature constraints between the fingers and the grasped object. Once obtained from the glove, the higher derivative specifications are used in formulating the synthesis task for the design of robotic fingers.
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