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https://www.readbyqxmd.com/read/29149686/preliminary-application-of-structure-from-motion-and-gis-to-document-decomposition-and-taphonomic-processes
#1
Connor D Carlton, Samantha Mitchell, Patrick Lewis
Over the past decade, Structure from Motion (SfM) has increasingly been used as a means of digital preservation and for documenting archaeological excavations, architecture, and cultural material. However, few studies have tapped the potential of using SfM to document and analyze taphonomic processes affecting burials for forensic sciences purposes. This project utilizes SfM models to elucidate specific post-depositional events that affected a series of three human cadavers deposited at the South East Texas Applied Forensic Science Facility (STAFS)...
November 2, 2017: Forensic Science International
https://www.readbyqxmd.com/read/29149063/estimating-stair-running-performance-using-inertial-sensors
#2
Lauro V Ojeda, Antonia M Zaferiou, Stephen M Cain, Rachel V Vitali, Steven P Davidson, Leia A Stirling, Noel C Perkins
Stair running, both ascending and descending, is a challenging aerobic exercise that many athletes, recreational runners, and soldiers perform during training. Studying biomechanics of stair running over multiple steps has been limited by the practical challenges presented while using optical-based motion tracking systems. We propose using foot-mounted inertial measurement units (IMUs) as a solution as they enable unrestricted motion capture in any environment and without need for external references. In particular, this paper presents methods for estimating foot velocity and trajectory during stair running using foot-mounted IMUs...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29148155/identifying-biomechanical-gait-parameters-in-adolescent-boys-with-haemophilia-using-principal-component-analysis
#3
L B Suckling, D Stephensen, M C Cramp, R Mahaffey, W I Drechsler
INTRODUCTION: Improvements in the medical management for those with haemophilia have resulted in improved clinical outcomes. However, current treatment regimens do not alleviate all joint haemarthroses with the potential for long-term joint deterioration remaining. The evaluation of functional activities such as gait, using standardized tools to monitor children with haemophilia is emerging. AIM: This study explored differences in sagittal plane biomechanics of walking in adolescent boys aged 11-18 years with haemophilia and an age-matched group of typically developing boys...
November 17, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/29147771/maximum-striking-velocities-in-strikes-with-steel-rods-the-influence-of-rod-length-rod-mass-and-volunteer-parameters
#4
T X Trinh, S Heinke, C Rode, S Schenkl, M Hubig, G Mall, Holger Muggenthaler
In blunt force trauma to the head caused by attacks with blunt instruments, contact forces can be estimated based on the conservation of momentum if impact velocities are known. The aims of this work were to measure maximum striking velocities and to examine the influence of rod parameters such as rod mass and length as well as volunteer parameters such as sex, age, body height, body mass, body mass index and the average amount of physical exercise. Steel rods with masses of 500, 1000 and 1500 g as well as lengths of 40, 65 and 90 cm were exemplarily tested as blunt instruments...
November 16, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29141022/trabecular-bone-in-the-calcaneus-of-runners
#5
Andrew Best, Brigitte Holt, Karen Troy, Joseph Hamill
Trabecular bone of the human calcaneus is subjected to extreme repetitive forces during endurance running and should adapt in response to this strain. To assess possible bone functional adaptation in the posterior region of the calcaneus, we recruited forefoot-striking runners (n = 6), rearfoot-striking runners (n = 6), and non-runners (n = 6), all males aged 20-41 for this institutionally approved study. Foot strike pattern was confirmed for each runner using a motion capture system. We obtained high resolution peripheral computed tomography scans of the posterior calcaneus for both runners and non-runners...
2017: PloS One
https://www.readbyqxmd.com/read/29140782/cloth-animation-retrieval-using-a-motion-shape-signature
#6
Markus Huber, Bernhard Eberhardt, Daniel Weiskopf
In cloth simulation, the behavior of textiles largely depends on initial conditions, parameters, and simulation techniques. Usually, several combinations of those aspects are altered until a simulation setting is found to create a satisfying animation. However, if an initial condition, such as a collision object, is changed afterward or the cloth behavior is transferred to a different scene, the existing set of simulation parameters could no longer be suitable for the desired look. In this case, it is difficult to find a new configuration by changing parameters manually and to determine if it conforms the desired properties...
November 2017: IEEE Computer Graphics and Applications
https://www.readbyqxmd.com/read/29140780/full-body-animation-of-human-locomotion-in-reduced-gravity-using-physics-based-control
#7
Yun-Hyeong Kim, Taesoo Kwon, Daeun Song, Young J Kim
The proposed physics-based approach can generate stable and robust full-body animation of various gaits under different gravitational conditions. As input, this method takes motion-captured human motions in the Earth's gravity and builds an inverted-pendulum on cart (IPC) control model, which is analyzed using the motion-captured data. The authors use a pre-estimation model based on the Froude number to predict the desired velocity and stride frequency of a character model in hypogravity and then generate full-body animation using a pendulum trajectory generator, motion planner, and tracking...
November 2017: IEEE Computer Graphics and Applications
https://www.readbyqxmd.com/read/29140777/computer-graphics-animation-for-objective-self-evaluation
#8
Yoko Usui, Katsumi Sato, Shinichi Watabe
The increased number of students enrolling in dance classes in Japan has resulted in a shortage of qualified instructors, leaving classes to be taught by instructors who are not trained in dance. The authors developed a system specifically designed to help nonqualified dance instructors teach dance using motion capture and animation. The goal is to allow dancers to easily self-evaluate their own performances by comparing it to a standard example.
November 2017: IEEE Computer Graphics and Applications
https://www.readbyqxmd.com/read/29140167/intra-tester-reliability-and-construct-validity-of-a-hip-abductor-eccentric-strength-test
#9
Richard A Brindle, D David Ebaugh, Clare E Milner
CONTEXT: Side-lying hip abductor strength tests are commonly used to evaluate muscle strength. In a 'break' test the tester applies sufficient force to lower the limb to the table while the patient resists. The peak force is postulated to occur while the leg is lowering, thus representing the participant's eccentric muscle strength. However, it is unclear whether peak force occurs before or after the leg begins to lower. OBJECTIVES: To determine intra-rater reliability and construct validity of a hip abductor eccentric strength test...
November 15, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29137725/a-gait-retraining-system-using-augmented-reality-to-modify-footprint-parameters-effects-on-lower-limb-sagittal-plane-kinematics
#10
Sami Bennour, Baptiste Ulrich, Thomas Legrand, Brigitte M Jolles, Julien Favre
Improving lower-limb flexion/extension angles during walking is important for the treatment of numerous pathologies. Currently, these gait retraining procedures are mostly qualitative, often based on visual assessment and oral instructions. This study aimed to propose an alternative method combining motion capture and display of target footprints on the floor. The second objectives were to determine the error in footprint modifications and the effects of footprint modifications on lower-limb flexion/extension angles...
November 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29135928/wearable-wide-range-strain-sensors-based-on-ionic-liquids-and-monitoring-of-human-activities
#11
Shao-Hui Zhang, Feng-Xia Wang, Jia-Jia Li, Hong-Dan Peng, Jing-Hui Yan, Ge-Bo Pan
Wearable sensors for detection of human activities have encouraged the development of highly elastic sensors. In particular, to capture subtle and large-scale body motion, stretchable and wide-range strain sensors are highly desired, but still a challenge. Herein, a highly stretchable and transparent stain sensor based on ionic liquids and elastic polymer has been developed. The as-obtained sensor exhibits impressive stretchability with wide-range strain (from 0.1% to 400%), good bending properties and high sensitivity, whose gauge factor can reach 7...
November 14, 2017: Sensors
https://www.readbyqxmd.com/read/29131189/3d-shape-deformation-and-vibration-measurements-using-infrared-kinect-sensors-and-digital-image-correlation
#12
Hieu Nguyen, Zhaoyang Wang, Patrick Jones, Bing Zhao
Consumer-grade red-green-blue and depth (RGB-D) sensors, such as the Microsoft Kinect and the Asus Xtion, are attractive devices due to their low cost and robustness for real-time sensing of depth information. These devices provide the depth information by detecting the correspondences between the captured infrared (IR) image and the initial image sent to the IR projector, and their essential limitation is the low accuracy of 3D shape reconstruction. In this paper, an effective technique that employs the Kinect sensors for accurate 3D shape, deformation, and vibration measurements is introduced...
November 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29129668/characterization-of-actions-taken-during-the-delivery-of-medication-therapy-management-a-time-and-motion-approach
#13
Alice C Chang, Jutieh Lincoln, Wendy M Lantaff, Stephanie A Gernant, Heather A Jaynes, William Doucette, Margie E Snyder
OBJECTIVES: To characterize actions performed by pharmacists and support staff during provision of medication therapy management (MTM) and to compare actions performed according to practice characteristics. METHODS: A purposeful sample of 7 MTM practices (2 call centers and 5 community practices) was identified and visited by investigators. Pharmacists and support staff were observed during their routine provision of MTM. Investigators characterized "major" (e.g...
November 9, 2017: Journal of the American Pharmacists Association: JAPhA
https://www.readbyqxmd.com/read/29129121/the-validity-and-intra-tester-reliability-of-markerless-motion-capture-to-analyse-kinematics-of-the-bmx-supercross-gate-start
#14
Josephine Grigg, Eric Haakonssen, Evelyne Rathbone, Robin Orr, Justin W L Keogh
The aim of this study was to quantify the validity and intra-tester reliability of a novel method of kinematic measurement. The measurement target was the joint angles of an athlete performing a BMX Supercross (SX) gate start action through the first 1.2 s of movement in situ on a BMX SX ramp using a standard gate start procedure. The method employed GoPro® Hero 4 Silver (GoPro Inc., USA) cameras capturing data at 120 fps 720 p on a 'normal' lens setting. Kinovea 0.8.15 (Kinovea.org, France) was used for analysis...
November 13, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29128701/quality-evaluation-of-sperm-from-livebearing-fishes-standardized-assessment-of-sperm-bundles-spermatozeugmata-from-xenotoca-eiseni-goodeidae
#15
Yue Liu, Leticia Torres, Terrence R Tiersch
Standardized evaluation of sperm quality is essential for research, commercial-scale cryopreservation, and induced spawning. However, standardized methods for evaluation of sperm bundles (spermatozeugmata or spermatophores) have not been established. The purpose of the present study was to use Redtail Splitfin (Xenotoca eiseni) as a model for freshwater livebearing fishes to establish initial standardized methods to collect sperm bundles, and quantitatively and qualitatively evaluate quality-related attributes...
October 28, 2017: Theriogenology
https://www.readbyqxmd.com/read/29125560/human-actions-analysis-templates-generation-matching-and-visualization-applied-to-motion-capture-of-highly-skilled-karate-athletes
#16
Tomasz Hachaj, Marcin Piekarczyk, Marek R Ogiela
The aim of this paper is to propose and evaluate the novel method of template generation, matching, comparing and visualization applied to motion capture (kinematic) analysis. To evaluate our approach, we have used motion capture recordings (MoCap) of two highly-skilled black belt karate athletes consisting of 560 recordings of various karate techniques acquired with wearable sensors. We have evaluated the quality of generated templates; we have validated the matching algorithm that calculates similarities and differences between various MoCap data; and we have examined visualizations of important differences and similarities between MoCap data...
November 10, 2017: Sensors
https://www.readbyqxmd.com/read/29122191/identifying-interactive-effects-of-task-demands-in-lifting-on-estimates-of-in-vivo-low-back-joint-loads
#17
Chad E Gooyers, Tyson A C Beach, David M Frost, Samuel J Howarth, Jack P Callaghan
This investigation examined interactions between the magnitude of external load, movement speed and (a)symmetry of load placement on estimates of in vivo joint loading in the lumbar spine during simulated occupational lifting. Thirty-two participants with manual materials handling experience were included in the study. Three-dimensional motion data, ground reaction forces, and activation of six bilateral trunk muscle groups were captured while participants performed lifts with two loads at two movement speeds and using two load locations...
February 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29122186/accuracy-of-angular-displacements-and-velocities-from-inertial-based-inclinometers
#18
Howard Chen, Mark C Schall, Nathan Fethke
The objective of this study was to evaluate the accuracy of various sensor fusion algorithms for measuring upper arm elevation relative to gravity (i.e., angular displacement and velocity summary measures) across different motion speeds. Thirteen participants completed a cyclic, short duration, arm-intensive work task that involved transfering wooden dowels at three work rates (slow, medium, fast). Angular displacement and velocity measurements of upper arm elevation were simultaneously measured using an inertial measurement unit (IMU) and an optical motion capture (OMC) system...
February 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29119862/static-and-dynamic-accuracy-of-a-magnetic-inertial-measurement-unit-used-to-provide-racket-swing-kinematics
#19
Benjamin Kane Williams, Ross H Sanders, Joong Hyun Ryu, Pitre C Bourdon, Philip Graham-Smith, Peter J Sinclair
Magnetic-inertial measurement units (MIMUs) are becoming more prevalent in sports biomechanics and may be a viable tool to evaluate kinematic parameters. This study examined the accuracy of a MIMU to estimate orientation angles under static conditions and dynamically from a squash racket during a forehand drive shot. A MIMU was mounted onto a goniometer and moved through 0-90°, with static data collected at 10° increments during 10 repetitions of all three axes. Typical error analyses showed the MIMU to be very reliable (TE ≤ 0...
November 9, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29118966/gaussian-elimination-based-novel-canonical-correlation-analysis-method-for-eeg-motion-artifact-removal
#20
Vandana Roy, Shailja Shukla, Piyush Kumar Shukla, Paresh Rawat
The motion generated at the capturing time of electro-encephalography (EEG) signal leads to the artifacts, which may reduce the quality of obtained information. Existing artifact removal methods use canonical correlation analysis (CCA) for removing artifacts along with ensemble empirical mode decomposition (EEMD) and wavelet transform (WT). A new approach is proposed to further analyse and improve the filtering performance and reduce the filter computation time under highly noisy environment. This new approach of CCA is based on Gaussian elimination method which is used for calculating the correlation coefficients using backslash operation and is designed for EEG signal motion artifact removal...
2017: Journal of Healthcare Engineering
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