16,161 Hits in 3.4 sec

Cyclic animation using partial differential equations

G. González Castro, M. Athanasopoulos, H. Ugail
2010 The Visual Computer  
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]

Haixiong Wang, Lee Markosian
2007 Sketch-Based Interfaces and Modeling  
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

L. H. You, Xiaosong Yang, X. Y. You, Xiaogang Jin, Jian J. Zhang
2010 Computer Animation and Virtual Worlds  
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

Kofi Ofori, Samuel W. Gordon, Emmanuel Akrobortu, Adriana A. Ampene, Emmanuel O. Darko
2014 Journal of Radiation Research and Applied Sciences  
/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

Georgios Naros, Kathrin Machetanz, Florian Grimm, Florian Roser, Alireza Gharabaghi, Marcos Tatagiba
2021 International Journal of Medical Robotics and Computer Assisted Surgery  
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  
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

Nikita Cobetto, Carl-Éric Aubin, Stefan Parent, Soraya Barchi, Isabelle Turgeon, Hubert Labelle
2017 Scoliosis and Spinal Disorders  
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

Primož Poredoš, Dušan Čelan, Janez Možina, Matija Jezeršek
2015 BMC Medical Imaging  
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]

Maria Victorova, Michael Ka-Shing Lee, David Navarro-Alarcon, Yongping Zheng
2021 arXiv   pre-print
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

Wei Zhuo, Jarek Rossignac
2013 Computer graphics forum (Print)  
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

Jiao Hu, Qing Yin, Canqun He, A. Ghadouani, F. Wu
2020 E3S Web of Conferences  
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

Gang HU, Huinan LI, Xianzhi HU
2020 Journal of Advanced Mechanical Design, Systems, and Manufacturing  
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]

Maria Victorova, Heidi Hin Ting Lau, Timothy Tin-Yan Lee, David Navarro-Alarcon, Yongping Zheng
2022 arXiv   pre-print
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

William Baxter, Naga Govindaraju
2010 Proceedings of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games - I3D 10  
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

Andrés E. Rivero, Stephane Fournier, Rafael M. Heeb, Benjamin K. S. Woods
2022 Applied Sciences  
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
« Previous Showing results 1 — 15 out of 16,161 results