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Wyszukujesz frazę "Ray Tracking" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
An object-oriented approach to simulating human gait motion based on motion tracking
Autorzy:
Tändl, M.
Stark, T.
Erol, N. E.
Löer, F.
Kecskeméthy, A.
Powiązania:
https://bibliotekanauki.pl/articles/930125.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza ruchu
system mięśniowo-szkieletowy
symulacja wieloczłonowa
promieniowanie rentgenowskie
gait/motion analysis
muskuloskeletal system
multibody simulation
MRI
X-ray
motion tracking
Opis:
Accurate bone motion reconstruction from marker tracking is still an open and challenging issue in biomechanics. Presented in this paper is a novel approach to gait motion reconstruction based on kinematical loops and functional skeleton features extracted from segmented Magnetic Resonance Imaging (MRI) data. The method uses an alternative path for concatenating relative motion starting at the feet and closing at the hip joints. From the evaluation of discrepancies between predicted and geometrically identified functional data, such as hip joint centers, a cost function is generated with which the prediction model can be optimized. The method is based on the object-oriented multibody library [...], which has already been successfully applied to the development of industrial virtual design environments. The approach has been implemented in a general gait visualization environment termed Mobile Body.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 3; 469-483
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PER Estimation of AIS in Inland Rivers based on Three Dimensional Ray Tracking
Autorzy:
Ma, F.
Chu, X. M.
Liu, C. G.
Powiązania:
https://bibliotekanauki.pl/articles/117153.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ray Tracking
Three Dimensional Ray Tracking
Automatic Identification System (AIS)
Package Error Rate (PER)
Chinese Navigable Waterways
Inland Shipping
PER Estimation
Ray Tracking Model
Opis:
The Automatic Identification System (AIS) is an important maritime safety device, which is populous in inland rivers. Compared with that in open sea, the Package Error Rate (PER) of AIS in inland river has increased sharply due to its complex environment. With the help of hardware in loop simulation, it is possible to make statistical calculation on the PER under a given field strength and describe the data by quadratic rational fraction. Meanwhile, in the three dimensional software environments, the signal field strength is able to be calculated by the ray tracking method, which exhausts all the possible propagation paths, including direct way, reflection, diffractions, and the other medium attenuation matters. Beyond that, in the model, the propagation geography information in inland rivers is required to be simplified in some way, or the computation of the ray tracking is too hard to get. The paper set the Changjiang Wuhan channel as the field testing region, and all the deviations are less than 5% in sunny weather, which proves the method accurate and effective.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 89-94
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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