Searching for authors named Alexander Thomas – sorted by Relevance.
94 documents found, showing 1 through 10.
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A Spectral Analysis Of The Masuda Flare Using Yohkoh Hard X-Ray TELESCOPE PIXON RECONSTRUCTION
- …Masudas discovery of a compact hard X-ray impulsive source at the apex of a flaring coronal loop has received a great deal of recent attention in the solar physics community. The Masuda are, which occurred on 1992 January 13, exhibited evidence of energy deposition in a compact region some distance …
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Sliding Modes In Intersecting Switching Surfaces, Ii: Hysteresis
- …. When a flow, discontinuous across a switching surface, points "inward" so one cannot leave, it induces a unique flow within the surface, called the sliding mode. Uniqueness of sliding modes does not obtain in general when several such surfaces intersect, and models must be refined. Following our e…
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Design and Evaluation of a Distributed Cache Architecture with Prediction
- …We propose a secondary cache architecture that combines a predictive fetch strategy with a distributed cache to build a high performance memory system. The cache is partitioned into smaller units and distributed evenly in the main memory space. The architecture o#ers high bandwidth between the c…
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Distributed Prefetch-buffer/Cache Design for High Performance Memory Systems
- …Microprocessor execution speeds are improving at a rate of 50%-80% per year while DRAM access times are improving at a much lower rate of 5%-10% per year. Computer systems are rapidly approaching the point at which overall system performance is determined not by the speed of the CPU but by the memor…
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Decidable theories of the ordering of natural numbers with unary predicates
- … Expansions of the natural number ordering by unary predicates are studied, using logics which in expressive power are located between first-order and monadic second-order logic. Building on the modeltheoretic composition method of Shelah, we give two characterizations of the decidable theories of t…
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Non-Rigid Modeling of Body Segments for Improved Skeletal Motion Estimation
- …A necessary requirement for many musculoskeletal modeling tasks is an estimation of skeletal motion from observations of the surface of a body segment. The skeletal motion may be used directly for inverse kinematic calculations or as an observation sequence for forward dynamic simulations. This pape…
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ALCOVED POLYTOPES I
- …Abstract. The aim of this paper is to initiate the study of alcoved polytopes, which are polytopes arising from affine Coxeter arrangements. This class of convex polytopes includes many classical polytopes, for example, the hypersimplices. We compare two constructions of triangulations of hypersimpl…
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On Special Representations of Strictly Positive Polynomials
- …this paper we show that this need not always be so. We give a complete characterisation (3.2) of m-tuples p 1 ; : : : ; p m for which every p 2 R[X], strictly positive on S(p 1 ; : : : ; p m ) has a representation (1.2). Schmudgen and Putinar both prove their theorem by solving rst an appropriate `…
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Efficient Bidirectional Path Tracing by Randomized Quasi-Monte Carlo Integration
- …As opposed to Monte Carlo integration the quasi-Monte Carlo method does not allow for an error estimate from the samples used for the integral approximation and the deterministic error bound is not accessible in the setting of computer graphics, since usually the integrands are of unbounded variatio…
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A Unifying Framework for Integer and Finite Domain Constraint Programming
- …We present a unifying framework for integer linear programming and finite domain constraint programming, which is based on a distinction of primitive and non-primitive constraints and a general notion of branch-and-infer. We compare the two approaches with respect to their modeling and solving capab…
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