8 research outputs found
Probabilistic structural mechanics research for parallel processing computers
Aerospace structures and spacecraft are a complex assemblage of structural components that are subjected to a variety of complex, cyclic, and transient loading conditions. Significant modeling uncertainties are present in these structures, in addition to the inherent randomness of material properties and loads. To properly account for these uncertainties in evaluating and assessing the reliability of these components and structures, probabilistic structural mechanics (PSM) procedures must be used. Much research has focused on basic theory development and the development of approximate analytic solution methods in random vibrations and structural reliability. Practical application of PSM methods was hampered by their computationally intense nature. Solution of PSM problems requires repeated analyses of structures that are often large, and exhibit nonlinear and/or dynamic response behavior. These methods are all inherently parallel and ideally suited to implementation on parallel processing computers. New hardware architectures and innovative control software and solution methodologies are needed to make solution of large scale PSM problems practical
NETRA - A Parallel Architecture for Integrated Vision Systems I: Architecture and Organization
Coordinated Science Laboratory was formerly known as Control Systems LaboratoryNational Aeronautics and Space Administration / NASA-NAG-1-61
Parallel Architectures and Parallel Algorithms for Integrated Vision Systems
Computer vision is regarded as one of the most complex and computationally intensive problems. An integrated vision system (IVS) is a system that uses vision algorithms from all levels of processing to perform for a high level application (e.g., object recognition). An IVS normally involves algorithms from low level, intermediate level, and high level vision. Designing parallel architectures for vision systems is of tremendous interest to researchers. Several issues are addressed in parallel architectures and parallel algorithms for integrated vision systems
A bibliography on parallel and vector numerical algorithms
This is a bibliography of numerical methods. It also includes a number of other references on machine architecture, programming language, and other topics of interest to scientific computing. Certain conference proceedings and anthologies which have been published in book form are listed also
Exploiting parallelism in n-D convex hull algorithms
PhD ThesisThe convex hull is a problem of primary importance because of its applications in
computational geometry. A number of sequential and parallel algorithms for computing
the convex hull of a finite set of points in the lower dimensions are known. In compar-
ison, the general n-D problem is not as well understood and parallel algorithms are not
so prevalent because the 2-D and 3-D methods are not easily extended to the general
case. This thesis presents parallel algorithms for evaluating the general n- D convex hull
problem (where 2-D and 3-D are special cases) using Swart's sequential algorithm. One of
our methods combines a gift-wrapping technique with partitioning and merge algorithms
> where the original list is split into p 1 partitions followed by the computation of
the subhulls using the sequential n-D gift-wrapping method. The partial hulls are then
combined using a fanin tree. The second method computes the convex hull in parallel
by wrapping around the edges until a complete facial lattice structure of the polytope is
generated.
Several parameterised versions of the proposed algorithms have been implemented on
the shared memory and message passing architectures. In the former, performance on an
Encore Multimax using Encore Parallel Threads and the more lightweight Microthread
programming utilities are examined. In the latter, performance on a transputer based
machine using CS- Tools is discussed. We have shown that our techniques will be useful
in the construction of faster algorithms which employ the n-D convex hull algorithms as
a sub-algorithmCommonwealth Scholarship
Commission in the United Kingdo
Cutting Edge Nanotechnology
The main purpose of this book is to describe important issues in various types of devices ranging from conventional transistors (opening chapters of the book) to molecular electronic devices whose fabrication and operation is discussed in the last few chapters of the book. As such, this book can serve as a guide for identifications of important areas of research in micro, nano and molecular electronics. We deeply acknowledge valuable contributions that each of the authors made in writing these excellent chapters
LASER Tech Briefs, Winter 1994
Topics include: Electronic Components and Circuits. Electronic Systems, Physical Sciences, Materials, Computer Programs, Mechanics, Machinery, Fabrication Technology, Mathematics and Information Sciences, Life Sciences, and Books and report