A new quadratic global placer called POLAR is proposed. POLAR is based on novel techniques for rough legalization and wirelength refinement. During look-ahead rough legalization (LAL), relative positions of cells are ...
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ISBN:
(纸本)9781479910694
A new quadratic global placer called POLAR is proposed. POLAR is based on novel techniques for rough legalization and wirelength refinement. During look-ahead rough legalization (LAL), relative positions of cells are maintained as they are relocated with minimal displacement to relieve excess area density. For each “hotspot” where placement overfill occurs, an expansion region covering the hotspot is constructed. Then the movable cells within each of these expansion regions are evenly assigned to density bins inside the expansion region by displacement-minimizing recursive bisection. In addition, a fast density-preserving and wirelength-reducing discrete refinement is applied to the first few LAL placements before each of these is used to augment the quadratic model used to obtain the next major placement iteration. The experimental results show that POLAR outperforms the state-of-the-art academic placers over the ISPD 2005.benchmarks.
This contribution discusses the modelling of panel flutter due to high-frequency movementinduced excitations, which is of interest in aerospace and civil engineering, since it may lead to fatigue failure due to vibrat...
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This paper presents afreehand, sketch-based interface for Computed aideddesign (CAD) engineering design and finite element analysis. After a user sketches a two dimensional sketch consisting of connected straight and...
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It is considered that the practice of Preliminary Ship design has not seen a commensurate change to that seen in the latter stages of design due to the introduction of Integrated Product Models. The range of research ...
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ISBN:
(纸本)9781905040384
It is considered that the practice of Preliminary Ship design has not seen a commensurate change to that seen in the latter stages of design due to the introduction of Integrated Product Models. The range of research and design studies undertaken recently by the UCL design Research Centre (DRC), show the comprehensive nature of its work using advances in computergraphics integrated with conventional numerical synthesis techniques at the earliest stages of ship design work. This has latterly included a focus on simulation in preliminary design studies. The simulation work that has already been undertaken by the UCL DRC, beyond the introductory presentation made to ICCAS 2005. is outlined. From this ongoing work certain insights, relevant to future use of graphically based preliminary ship design, are discussed as they address both the issue of the level of design description and the procedural issues associated with the design process. The paper concludes with a consideration as to where the integration of a graphically based design description with simulation developments, such as the moves to a "Virtual Ship" approach], might lead future ship design practice. Allied to this is the question as to whether the introduction of interactive computergraphics into preliminary ship design can be considered to constitute a genuine paradigm shift in the design of physically large complex products, exemplified by a wide range of sophisticated examples of ship design practice.
We present a novel approach for interactive view-dependent rendering of massive models. Our algorithm combines view-dependent simplification, occlusion culling, and out-of-core rendering. We represent the model as a c...
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The proceedings contain 82 papers. The topics discussed include: a robust iterative method devoted to pole curve fitting;evolution of 3D curves under strict spatial constraints;a fitting approach with dynamic algebrai...
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ISBN:
(纸本)0769524737
The proceedings contain 82 papers. The topics discussed include: a robust iterative method devoted to pole curve fitting;evolution of 3D curves under strict spatial constraints;a fitting approach with dynamic algebraic spline curves;a method of generating smooth surface using C-curves;determination of free parameters in algebraic surface blending;surface blending with curvature continuity;the constraint elevation for parametric continuity order of NURBS curve and surface;subdivision surfaces based on point-based splines;adaptive refinement scheme for subdivision surfaces based on triangular meshes;high quality triangulation of implicit surfaces;implicit fitting and smoothing using radial basis functions with partition of unity;fast mesh-free deformations;3D model retrieval based on orthogonal projections;and rod-like trabeculae extraction from cancellous bone microstructure using topological analysis.
The following topics are dealt with: subdivision surfaces; implicit surfaces and point-based surfaces; shape analysis; CAD systems; reverse engineering and industrial applications; collaborative design; mesh parameter...
The following topics are dealt with: subdivision surfaces; implicit surfaces and point-based surfaces; shape analysis; CAD systems; reverse engineering and industrial applications; collaborative design; mesh parameterization; surface reconstruction; finite element analysis and volumetric models; large data sets; visualization; GPU based computation and graphics library; motion and path; simulation and animation; texture and image synthesis; and image processing.
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