Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Boolean operations"”.
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Algebraic level sets for CAD/CAE integration and moving boundary problems
… analysis applications outside the CAD systems. Boolean operations between interacting B-rep CAD models as well as analysis of such multi-body systems are fundamental operations on B-rep geometries in CAD/CAE applications. However, the boundary representation of B-rep solids is, in general, not a …
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Instruction Sets for Parallel Random Access Machines
… sets. A basic PRAM can perform the following operations in unit-time: addition, subtraction, Boolean operations, comparisons, and indirect addressing. Multiple processors may concurrently read and concurrently write a single cell. Let PRAM$\lbrack op\rbrack$ denote the class of PRAMs with the …
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Interactive freeform solid modeling with haptic interface
… and based on the ray-casting method to perform Boolean operations between the tool swept volume and the virtual stock in dexel data to simulate the sculpting process. A new method for surface reconstruction from dexel data is presented"--Abstract, page iii.
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Towards open-ended crowd-powered data processing: a case study of clustering and counting
… like filters and joins. These primitive boolean operations, where the human responses come from a small, finite space of possible answers, are inadequate for a number of data analysis tasks, especially those involving images, videos and maps. There is, thus, a need for open-ended …
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Virtual reality based creation of concept model designs for CAD systems
… geometry of the tool and its trajectories. Then Boolean operations are performed on the swept volumes and the initial virtual stock (work piece) to create the design model. Algorithms have been developed as a part of this work to integrate the VR environment with a commercial CAD/CAM system in …
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3D Mapping of Islamic Geometric Motifs
… rules including, Euclidean transformations and Boolean operations. Next, APSG was used to construct the architectural structures that manipulates the motif by automating the grammar rules. The APSG forms a wall, a column, a self-similarity star and a dome, the main features of Islamic …
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3D Mapping of Islamic Geometric Motifs
… rules including, Euclidean transformations and Boolean operations. Next, APSG was used to construct the architectural structures that manipulates the motif by automating the grammar rules. The APSG forms a wall, a column, a self-similarity star and a dome, the main features of Islamic …
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Forbidden-Patterns and Word Extensions for Concatenation Hierarchies
… be build up from alphabet letters by using only Boolean operations and concatenation. The complexity of these languages can be measured with the so-called dot-depth. This measure leads to concatenation hierarchies like the dot-depth hierarchy (DDH) and the closely related Straubing-Thérien …
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The topological derivative and its applications to fracture-based analysis and design
… which allow for the use of differentiable Boolean operations to combine the level-set functions of predefined simple geometries. This adoption of R-functions has the dual impact of (i) allowing shapes to merge and/or separate and (ii) simplifying the computation of the shape velocity fields.
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The Forbidden Pattern Approach to Concatenation Hierarchies
… alternating the closure under concatenation and Boolean operations, beginning with single alphabet letters. Now the question of dot-depth is the question whether these hierarchy classes have decidable membership problems. The thesis makes progress on this question using the so-called forbidden …
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Development of a SWMM-GIS Flood Model for New Orleans Drainage Pumping Station No 4 Basin
… volume computation of flooded areas by using Boolean operations on a Triangular Irregular Network (TIN) surface of node elevations and a TIN surface of LIDAR elevation data. Flood volumes were obtained for the study area by simulating a series of rain events. These flood volumes were then …
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Automated CAD Model Generation for Structural Optimisation
… using standard constructive solid geometry (CSG) operations. The obtained parametric CAD models are compact, that is, have as few as possible geometric parameters, which makes them ideal for editing and further processing within a CAD system. The critical task of converting the topology-optimised …
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Automated Reasoning via a Multi-sorted Fragment of Computable Set Theory with Applications to Semantic Web
… The DL $\shdlssx$ admits, among other features, Boolean operations on concepts and roles, data types, and product of concepts. Moreover, $\flqsr$ provides a unique formalism which combines the features of the DL $\shdlssx$ with a rule language admitting full negation and subject to no safety …
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Multi-scale representations of virtual 3D city models
… landmark building models are subtracted using Boolean operations and integrated in a photo-realistic way. Finally, for the interactive 3D visualization we discuss the creation of the virtual 3D geometry and their appearance styling through colors, labeling, and transparency. We demonstrate the …