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  • 1
    Electronic Resource
    Electronic Resource
    Continuous-resolution-level constraints in variational design of multiresolution shapes (1998)
    Springer
    The visual computer 14 (1998), S. 177-192 
    Details
    ISSN: 1432-2315
    Keywords: Key words: Continuous-resolution levels ; Geometric constraints ; Variational modeling ; Curves and surfaces ; Wavelets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003710050133
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Creating and retargetting motion by the musculoskeletal human body model (2000)
    Springer
    The visual computer 16 (2000), S. 254-270 
    Details
    ISSN: 1432-2315
    Keywords: Key words: Human animation – Muscle-based model – Motion retargetting – Motion synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Recently, optimization has been used in various ways to interpolate or retarget human body motions obtained by motion-capturing systems. However, in such cases, the inner structure of a human body has rarely been taken into account, and hence there have been difficulties in simulating physiological effects such as fatigue or injuries. In this paper, we propose a method to create/retarget human body motions using a musculoskeletal human body model. Using our method, it is possible to create dynamically and physiologically feasible motions. Since a muscle model based on Hill's model is included in our system, it is also possible to retarget the original motion by changing muscular parameters. For example, using the muscle fatigue model, a motion where a human body gradually gets tired can be simulated. By increasing the maximal force exertable by the muscles, or decreasing it to zero, training or displacement effects of muscles can also be simulated. Our method can be used for biomechanically correct inverse kinematics, interpolation of motions, and physiological retargetting of the human body motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003719900065
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The homotopy model: a generalized model for smooth surface generation from cross sectional data (1991)
    Springer
    The visual computer 7 (1991), S. 72-86 
    Details
    ISSN: 1432-2315
    Keywords: Homotopy model ; Surface reconstruction ; Contour registration ; Continuous toroidal graph representation ; Triangulation ; Parametric surface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A generalized model, called the homotopy model, is presented to reconstruct surfaces from cross-sectional data of objects using a homotopy to generate surfaces connecting consecutive contours. The homotopy model consists of continuous toroidal graph representation and homotopic generation of surfaces from the representation. It is shown that the homotopy model includes triangulation as a special case and generates smooth parametric surfaces from contour-line definitions using homotopy. The model can be applied to contours represented by parametric curves as well as linear line segments. First, a heuristic method that finds the optimal path on the toroidal graph is presented. Then the toroidal graph is expanded to a continuous version. Finally, homotopy is used for reconstructing parametric surfaces from the toroidal graph representation. A loft surface is also a special case of homotopy, a straight-line homotopy. Homotopy that corresponds to the cardinal spline surface is also introduced. Three-dimensional surface reconstruction of human auditory surface reconstruction of human auditory ossicles illustrates the advantages of the homotopy model over the others.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01901178
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of the elongation of the coiled filamentous structure, the truncated cone, during the acrosome reaction of abalone sperm by computer simulation and quick-freeze, deep-etch electron microscopy (1993)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 25 (1993), S. 201-211 
    Details
    ISSN: 0886-1544
    Keywords: acrosome-reacted sperm ; coiled filament ; intermediate filament ; quick-freeze ; deep-etch technique ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A novel structure named the truncated cone was located in the apex of the acrosomal vesicle right beneath the outer acrosomal membrane of abalone sperm head. This truncated cone structure was composed of about 12 helically coiled filaments, each 3.5-3.6 μm long with a diameter of 8-12 nm, forming a tightly compressed helicoid. During the acrosome reaction, the truncated cone elongated more than three times the original height and transformed into a thin cylinder by further coiling up of the filaments from the initial 2.5 to final 5 turns. The diameter and the lenght of each filament did not change during the elongation of the truncated cone into thin cylinder.Calculation from the equation of helical movement (spiral motion) applying the actual values of the truncated cone structure measured by electron microscopy gave the theoretical values nearly coincident with the actual measurements. The computer animation simulated the process of the movement of the coiled filaments composing the truncated cone and suggested that the elongation of the truncated cone into thin cylinder can be elucidated as a helical movement of the coiled filaments keeping their length constant.Quick-freeze, deep-etch electron microscopy further revealed that each of the coiled filaments was characterized by its beaded configuration, closely resembling that of the intermediate filametns of our previous results by immunoelectron microscopy and immunoblot analysis. The movement of the helically coiled filaments of the truncated cone may provide first example of the intermediate filaments to participate in motility and fertilization. © 1993 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970250209
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    Paper (German National Licenses)
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