In this survey we discuss different state-of-the-art approaches of combining exact algorithms and metaheuristics to solve combinatorial optimization problems. Some of these hybrids mainly aim at providing optimal solu...
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Research in the area of spatial visualization enjoys a long tradition in the engineering design graphics (EDG) profession and the discipline of cognitive psychology. In many cases, this has involved the use of a stand...
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Research in the area of spatial visualization enjoys a long tradition in the engineering design graphics (EDG) profession and the discipline of cognitive psychology. In many cases, this has involved the use of a standardized measure to assess the spatial aptitude of the participant followed by the use of the score on that test to predict the level of participant success in a particular setting or vocation. The EDG profession has traditionally used such tests to determine whether students will have success in the use of CAD tools or to assess a student's abilities in the creation of engineering drawings. The type of visualization test often used in these cases has been one based on mental rotations of an object into a desired position. While this single test may have been appropriate for primitive-based CAD tools, it is the contention of these authors that another test is required to accurately assess student aptitude and ability to use contemporary, sketcher-based CAD tools: the Mental Cutting Test, which requires the matching of a plane passing through an object to its corresponding planar cross-section. This activity parallels the procedure required for geometry creation within sketcher-based CAD tools as well as visualization of section views commonly used in engineering drawings. This paper will outline a brief history of the use of rotations-style visualization tests within the EDG profession and their use to predict learning or success within a specific learning environment. It will also elaborate on the use of the Mental Cutting Test as a complementary, and potentially more appropriate, measure of success in the use of contemporary CAD tools, as well as its relationship to learning activities surrounding the use of sketcher-based CAD tools. Finally, the relationship of spatial ability testing to virtual reality and haptic technologies will be introduced.
This paper describes several approaches to keyword spotting (KWS) for informal continuous speech. We compare acoustic keyword spotting, spotting in word lattices generated by large vocabulary continuous speech recogni...
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This paper describes several approaches to keyword spotting (KWS) for informal continuous speech. We compare acoustic keyword spotting, spotting in word lattices generated by large vocabulary continuous speech recognition and a hybrid approach making use of phoneme lattices generated by a phoneme recognizer. The systems are compared on carefully defined test data extracted from ICSI meeting database. The acoustic and phoneme-lattice based KWS are based on a phoneme recognizer making use of temporal-pattern (TRAP) feature extraction and posterior estimation using neural nets. We show its superiority over traditional HMM/GMM systems. The advantages and drawbacks of different approaches are discussed.
This paper presents a new approach for constructing a consistent (non-manifold) mesh based on non-binary datasets. Mesh generation is the method of choice if a surface is extracted based on labeled volumetric datasets...
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ISBN:
(数字)9783540264316
ISBN:
(纸本)3540250522
This paper presents a new approach for constructing a consistent (non-manifold) mesh based on non-binary datasets. Mesh generation is the method of choice if a surface is extracted based on labeled volumetric datasets. In most cases, the traditional Marching Cubes algorithm or one of its extensions is applied for generating meshes of binary labeled input data. However, for different - especially medical - applications, non-binary datasets with more than two differently labeled voxels can be adjacent in a rectilinear grid. For these cases, the traditional Marching Cubes algorithm fails. Additional to the mesh generation algorithm, an extension for a well-known geometric filter is presented avoiding ridges in the mesh.
Modelling and reconstruction of tubular objects from graph representations is frequently needed in medical visualization. The constructed geometrical models need to be consistent and compact at the same time for inter...
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ISBN:
(数字)9783540264316
ISBN:
(纸本)3540250522
Modelling and reconstruction of tubular objects from graph representations is frequently needed in medical visualization. The constructed geometrical models need to be consistent and compact at the same time for interactive applications. In this paper we present a new method for generating compact topologically consistent 2-manifold surfaces of branching tubular objects. The proposed two-stage approach based on deformable simplex-meshes can handle higher order furcations.
RNA is generally a single-stranded molecule where the bases form hydrogen bonds within the same molecule leading to structure formation. In comparing different homologous RNA molecules it is usually not sufficient to ...
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In this paper we discuss expressive visualization techniques that smartly uncover the most important information in order to maximize the visual information in the resulting images. This is achieved through dynamic ch...
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In volume rendering it is very difficult to simultaneously visualize interior and exterior structures while preserving clear shape cues. Very transparent transfer functions produce cluttered images with many overlappi...
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