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Cyclic animation using partial differential equations
2010
The Visual Computer
Preserved Fulltext
The first consists of using attaching the set of curves to a skeletal system holding the animation for cyclic motions linked to a set mathematical expressions, the second one exploits the spine associated ...
The first of these approaches is implemented within a framework related to cyclic motions inherent to human-like characters, whereas the spine-based approach is focused on modelling the undulatory movement ...
The creation of believable character motion requires controls based on how real bodies work [13] . ...
doi:10.1007/s00371-010-0422-5
fatcat:zjfvnqwqoraijhx3ii7zoweswm
Free-form Sketch
[article]
2007
Sketch-Based Interfaces and Modeling
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We describe a sketch-based system for modeling 3D shapes based on a new multiresolution shape representation we call a layered mesh. ...
The simplest primitives are points and curves, which can be used to define several kinds of parameteric surface. Surfaces can be inflated or smoothly joined to produce a broad range of shapes. ...
While our skin primitive is based on the algorithm of Markosian et al. [MCCH99] , our implementation uses a static triangulation. ...
doi:10.2312/sbm/sbm07/053-058
fatcat:vbocbtpz6re4zlrwvehezoqkjq
Shape manipulation using physically based wire deformations
2010
Computer Animation and Virtual Worlds
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It defines a 3D model with profile curves, and uses spine curves generated from the profile curves to control the motion and global shape of 3D models. ...
With the proposed approach, global shape changes are achieved through manipulating spine wires, and local surface details are created by deforming profile wires. ...
Shape manipulation techniques based on curve deformations use wires to control surface shapes. ...
doi:10.1002/cav.352
fatcat:evxeh3e6jvbq5heihavellozgm
Estimation of adult patient doses for selected X-ray diagnostic examinations
2014
Journal of Radiation Research and Applied Sciences
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/chest (PA/RLAT), pelvis (AP), cervical spine (AP/LAT), thoracic spine (AP) and lumber spine (AP) in three public hospitals each equipped with constant potential generators (no ripple), an xray emission ...
Effective dose X-rays a b s t r a c t The caldose_x 5.0 software has been used to assess the entrance skin doses (ESD) and effective doses (ED) of adult patients undergoing x-ray examinations of the thorax ...
The software enables the calculation of the incident air kerma (INAK) based on the output curve of an x-ray tube and of the entrance surface air kerma (ESAK) by multiplying the INAK with a backscatter ...
doi:10.1016/j.jrras.2014.08.003
fatcat:mdoqjf4xdrhf3feayhlgvhntm4
Framed and non‐framed robotics in neurosurgery:a ten‐years single‐center experience
2021
International Journal of Medical Robotics and Computer Assisted Surgery
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Predictors of workflow efficiency (e.g., skin-to-skin) were evaluated and compared to conventional techniques (neuronavigation, stereotaxy). ...
The present study describes the quality indicators of three different robots in brain and spine surgery. This single-center study enrolled 252 patients over a ten-years period. ...
Preoperative images were transferred to the neuronavigation software (Curve, BrainLab). Patient-to-image registration was performed on surface registration. ...
doi:10.1002/rcs.2282
pmid:34030218
fatcat:ngopav2xibagxlkan26lmhc7bq
Roentgen therapy of rheumatoid spondylitis
1949
California medicine
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Based on the pathological processes involved in rheumatoid spondylitis, comparison is made between the physical qualities of certain techniques of roentgen therapy. ...
Graphic representation of the isodose curves and the homogeneous distribution of radiation pertaining to the method herein advocated is shown. ...
plane, at a depth of 7 centimeters from the skin surface. ...
pmid:18123526
pmcid:PMC1643599
fatcat:beakhiqtqbchnkigmhf5aw4lh4
3D correction of AIS in braces designed using CAD/CAM and FEM: a randomized controlled trial
2017
Scoliosis and Spinal Disorders
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On average, FEMBraces were 50% thinner and had 20% less covering surface than CtrlBraces while reducing T and L curves by 47 and 48%, respectively, compared to 25 and 26% for CtrlBraces. ...
For the test group, 3D reconstructions of the spine and patient's torso were additionally used to generate a personalized FEM to simulate and iteratively improve the brace design with the objective of ...
Background Orthopedic bracing is the conservative treatment generally prescribed to control curve progression in adolescent idiopathic scoliosis (AIS) showing curves between 20°and 40°of Cobb angle [1 ...
doi:10.1186/s13013-017-0128-9
pmid:28770254
pmcid:PMC5525241
fatcat:xd4hm5gcebevndzrwswzsdfely
Determination of the human spine curve based on laser triangulation
2015
BMC Medical Imaging
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Manual determination of the spine curve, which was based on palpation of the thoracic and lumbar spinous processes, was found to be an appropriate way to validate the method. ...
The main objective of the present method was to automatically obtain a spatial curve of the thoracic and lumbar spine based on a 3D shape measurement of a human torso with developed scoliosis. ...
The determination of spatial spine curve was performed by visual estimation based on the selection of the best spinous process locations, which were characterized by bumps and dips on the back surface. ...
doi:10.1186/s12880-015-0044-5
pmid:25651841
pmcid:PMC4327951
fatcat:m4drt2oxczfdxlxdrinpyggipu
Follow the Curve: Robotic-Ultrasound Navigation with Learning Based Localization of Spinous Processes for Scoliosis Assessment
[article]
2021
arXiv
pre-print
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We developed a new force-driven controller that automatically adjusts the probe's pose relative to the skin surface to ensure a good acoustic coupling between the probe and skin. ...
The angles of spinal deformity measured on spinal reconstruction images were similar for both methods, implying that they equally reflect human anatomy. ...
According to these anatomical differences, the pressure applied by the Fig. 6 : The probe fixed rotation adjustment based on the shape of the following surface. ...
arXiv:2109.05196v1
fatcat:wa7x2znlnjbzxj6hnlteiivjuu
Fleshing: Spine-driven Bending with Local Volume Preservation
2013
Computer graphics forum (Print)
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Portions of the dissertation, or preliminary mathematical models and experiments on deformation driven with non-stretchable spine curve, have been published as ...
This dissertation dedicates to introducing spine-based deformation: Any distortion to the shape is controlled by a low dimensional proxy, which is a spine curve or surface. ...
Second in the transferring step, we need to consider the stretching in two directions on the spine surface instead of one on the spine curve. ...
doi:10.1111/cgf.12049
fatcat:zxpqyqkmmnbfxnkwe3pbfvqqmi
Design of female white-collar office chair based on ergonomics
2020
E3S Web of Conferences
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Sitting on the office chair for a long time may cause diseases such as cervical, shoulder, and lumbar spine. ...
on ergonomics and sitting analysis research, design general office chairs for female white-collar workers to achieve a comfortable and healthy office purpose. ...
In addition, the shape of the seat adopts a curve based on human biomechanical research. ...
doi:10.1051/e3sconf/202017902101
fatcat:ja4vnccipnauloqjwdqnjlxbty
A novel geometric modeling approach for cubic developable C-Bézier surfaces
2020
Journal of Advanced Mechanical Design, Systems, and Manufacturing
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By using the control plane with generalized cubic C-Bézier basis function, the GCDC-Bézier surfaces are designed, and the shape of the surfaces are adjusted by changing its shape parameters. ...
In this paper, a novel geometric modeling method is proposed to construct generalized cubic developable C-Bézier (GCDC-Bézier, for short) surfaces with shape parameters. ...
If taking ) (t q as a spine curve and considering the developable surface as the tangent surface of the spine curve, the following generalized cubic spine curve developable H-Bézier surface can be constructed ...
doi:10.1299/jamdsm.2020jamdsm0047
fatcat:5m7zcf6qprforojwzrt3w3yrd4
Reliability of Robotic Ultrasound Scanning for Scoliosis Assessment in Comparison with Manual Scanning
[article]
2022
arXiv
pre-print
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Two human raters measured each subject's spinous process angles (SPA) on robotic and manual coronal images. ...
Conclusions: This study demonstrated that scoliosis deformity angles measured on ultrasound images obtained with robotic scanning are comparable to those obtained by manual scanning. ...
For example, the thoracic part of the spine generally has larger curves in the sagittal view than the lumbar part; thus, a larger control gain is needed. 25,774 images were used for training and testing ...
arXiv:2205.03566v1
fatcat:ndt4bem6b5fmrmjbhdoaw2zg5u
Simple data-driven modeling of brushes
2010
Proceedings of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games - I3D 10
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Figure 1 : We create a dynamic deformable 3D brush based on measurements taken of actual brush deformations (top row). ...
Also thanks to Nelson Chu who collaborated on the development of the underlying paint system, and to the anonymous artist who painted Figure 9 . ...
Mesh deformation and skinning For mesh deformation based upon the motion of the control bristles, we first subdivide each Bézier curve non-uniformly in unit arclength at points according to the following ...
doi:10.1145/1730804.1730826
dblp:conf/si3d/BaxterG10
fatcat:mc2k3qdturhsvmnntrkk6px3pq
Design, Manufacture and Wind Tunnel Test of a Modular FishBAC Wing with Novel 3D Printed Skins
2022
Applied Sciences
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Additionally, the device shows a change in the pitching moment coefficient of ΔCM≈0.1, which shows the potential that the FishBAC has as a control surface. ...
These skin panels are printed using two different Thermoplastic Polyurethane (TPU) formulations: a soft, high strain formulation for the deformable membrane of the skin, reinforced with a stiffer formulation ...
First generation of FishBAC devices based on 3D-printed plastic [19]. The copyright of this photograph belongs to Benjamin K.S. ...
doi:10.3390/app12020652
fatcat:hhxjtlooebbflhi3kkvyku72ke
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