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检索条件"任意字段=9th International Symposium on Symbolic and Numeric Algorithms for Scientific Computing"

共 590 条记录，以下是241-250 订阅

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A streamlined difference ring theory: Indefinite nested sums, the alternating sign and the parameterized telescoping problem 16

A streamlined difference ring theory: Indefinite nested sums...

引用

16th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Schneider, Carsten Johannes Kepler Univ Linz RISC A-4040 Linz Austria

We present an algebraic framework to represent indefinite nested sums over hypergeometric expressions in difference rings. In order to accomplish this task, parts of Karr9;s difference field theory have been extend... 详细信息

ISBN: (纸本)9781479984480

We present an algebraic framework to represent indefinite nested sums over hypergeometric expressions in difference rings. In order to accomplish this task, parts of Karr's difference field theory have been extended to a ring theory in which also the alternating sign can be expressed. the underlying machinery relies on algorithms that compute all solutions of a given parameterized telescoping equation. As a consequence, we can solve the telescoping and creative telescoping problem in such difference rings.

关键词： symbolic summation telescoping creative telescoping roots of unity d'Alembertian expressions

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Algorithm for Cooperative CPU-GPU computing

Algorithm for Cooperative CPU-GPU Computing

引用

15th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Aciu, Razvan-Mihai Ciocarlie, Horia Politehn Univ Dept Comp & Software Engn Timisoara Romania

ISBN: (纸本)9781479930357

Many applications have modules which could benefit greatly from the massive parallel numeric computing power provided by GPUs. Renderers, signal processing or simulators are only a few such applications. Due to the weaknesses of the GPUs such as stackless execution model or poor capabilities for pointer exchange with the host, sometimes is not feasible to convert an entire algorithm for GPU, even if it is highly parallel and some of its parts can be greatly accelerated on GPU. In such situations a programmer should have a framework which allows him to split the code flow of a thread in parts and each of these parts will run on the most suitable computing resource, CPU or GPU. For GPU execution, multiple data from host threads will be collected, run on GPU and the results returned to the original threads so they will be able to resume execution on host. In this paper we propose such an algorithm, analyze it and evaluate its practical results.

关键词： GPU heterogeneous computing cooperative multitasking algorithm

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Distributed Resource Identification Service for Cloud Environments

Distributed Resource Identification Service for Cloud Enviro...

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15th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Panica, Silviu Petcu, Dana West Univ Timisoara Res Inst E Austria Timisoara Romania

ISBN: (纸本)9781479930357

Resource identification in massive deployed distributed systems, like the cloud environments, is a common problem when multiple types of resources need to be managed. this is the case of platform as a service (PaaS) where the platform offers different types resources that are deployed in heterogeneous systems. While most of the solutions on the market follow a predefined architecture using common naming services in a centralized manner this paper proposes a new approach based on a distributed naming and resource identification service. the proposed solution allows a client to consume or communicate with a resource without having to deal with resource location or discovery protocols.

关键词： loud computing distributed systems resource discovery resource identificationloud computing distributed systems resource discovery resource identificationc

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Quality Assurance for Open Source Software Configuration Management

Quality Assurance for Open Source Software Configuration Man...

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15th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Meyer, Stefan Healy, Philip Lynn, theo Morrison, John Natl Univ Ireland Univ Coll Cork Irish Ctr Cloud Comp & Commerce Cork Ireland Dublin City Univ Dublin 9 Ireland

ISBN: (纸本)9781479930357

Commonly used open source configuration management systems, such as Puppet, Chef and CFEngine, allow for system configurations to be expressed as scripts. A number of quality issues that may arise when executing these scripts are identified. An automated quality assurance service is proposed that identifies the presence of these issues by automatically executing scripts across a range of environments. Test results are automatically published to a format capable of being consumed by script catalogues and social coding sites. this would serve as an independent signal of script trustworthiness and quality to script consumers and would allow developers to be made quickly aware of quality issues. As a result, potential consumers of scripts can be assured that a script is likely to work when applied to their particular environment. Script developers can be notified of compatibility issues and take steps to address them.

关键词： Automated configuration configuration management continuous integration automated deployment service orchestration assurance

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Bound Propagation for Arithmetic Reasoning in Vampire

Bound Propagation for Arithmetic Reasoning in Vampire

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15th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Dragan, Ioan Korovin, Konstantin Kovacs, Laura Voronkov, Andrei Vienna Univ Technol Vienna Austria Univ Manchester Manchester M13 9PL Lancs England Chalmers Univ Technol Gothenburg Sweden

ISBN: (纸本)9781479930357

this paper describes an implementation and experimental evaluation of a recently introduced bound propagation method for solving systems of linear inequalities over the reals and rationals. the implementation is part of the first-order theorem prover Vampire. the input problems are systems of linear inequalities over reals or rationals. their satisfiability is checked by assigning values to the variables of the system and propagating the bounds on these variables. To make the method efficient, we use various strategies for representing numbers, selecting variable orderings, choosing variable values and propagating bounds. We evaluate our implementation on a large number of examples and compare it with state-of-the-art SMT solvers.

关键词： arithmetic reasoning bound propagation method conflict resolution linear arithmetic linear real arithmetic Conflict Resolution Bound computability arithmetic Reasoning Linear Inequality Propagating inequalities Real number

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Fast computing of Non-Uniform Sampling Positions for Real Signals

Fast Computing of Non-Uniform Sampling Positions for Real Si...

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15th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Kovacs, Peter Vad, Viktor Eotvos Lorand Univ Dept Numer Anal Budapest Hungary Tampere Univ Technol Dept Signal Proc FIN-33101 Tampere Finland

ISBN: (纸本)9781479930357

there is a wide range of applications of non-equidistant discretization of real signals. For instance, in computer graphics, Fourier analysis, identification and control theories, etc. they have the common ability to describe dynamical systems as well. In this paper we provide a fast algorithm based on an existing mathematical model to compute a non-uniform grid for representing different types of signals. In order to do that we need new concepts for constructing an effective numerical solution. Additionally, two experiments are performed to investigate the accuracy of the method. Finally, we also present a parallel implementation in CUDA which can further improve the execution time.

关键词： Rational function systems nonlinear equations fixed-point iterations CUDA-based parallel algorithms

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Interactive Data Exploration for High-Performance Fluid Flow Computations through Porous Media 16

Interactive Data Exploration for High-Performance Fluid Flow...

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16th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Perovic, Nevena Frisch, Jerome Mundani, Ralf-Peter Rank, Ernst Tech Univ Munich Chair Computat Engn D-80290 Munich Germany

ISBN: (纸本)9781479984480

Huge data advent in high-performance computing (HPC) applications such as fluid flow simulations usually hinders the interactive processing and exploration of simulation results. Such an interactive data exploration not only allows scientiest to 'play' with their data but also to visualise huge (distributed) data sets in both an efficient and easy way. therefore, we propose an HPC data exploration service based on a sliding window concept, that enables researches to access remote data (available on a supercomputer or cluster) during simulation runtime without exceeding any bandwidth limitations between the HPC back-end and the user front-end.

关键词： high-performance computing interactive data exploration adaptive data structure multi-grid-like solver concept flow through porous media

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Correct Metric Semantics for a Biologically-Inspired Formalism 16

Correct Metric Semantics for a Biologically-Inspired Formali...

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16th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Ciobanu, Gabriel Todoran, Eneia Nicolae Acad Romana Inst Comp Sci Iasi Romania Tech Univ Cluj Napoca Dept Comp Sci Cluj Napoca Romania

ISBN: (纸本)9781479984480

We investigate the semantics of a biologically-inspired formalism. this formalism was initially introduced by Cardelli as a "strand algebra" for DNA computing. For such a language we study and relate new formal semantic models. the mathematical framework is given by complete metric spaces in which the Banach fixed point theorem is used;various semantic functions are defined as fixed points of appropriate higher-order mappings. We define a new denotational semantics and compare it with the operational semantics introduced by Cardelli. We establish the formal relation between the operational and the denotational semantics by using an abstraction operator and a fixed point argument. In this way we establish the correctness of the denotational semantics with respect to the operational semantics.

关键词： DNA computing operational semantics denotational semantics semantic correctness

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Non-Interleaving Operational Semantics for Geographically Replicated Databases

Non-Interleaving Operational Semantics for Geographically Re...

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15th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Ciobanu, Gabriel Horne, Ross Romanian Acad Inst Comp Sci Iasi 700505 Romania

ISBN: (纸本)9781479930357

For scalable distributed database systems, weak consistency models are essential. Distributed databases, such as Google Spanner, scale to millions of nodes that replicate data across datacentres possibly located on different continents. At this scale, it is infeasible to maintain serialisability, which assumes that a global total order over committed transactions can be established. Instead, weaker consistency models, such as eventual consistency, causal consistency, sequential consistency and external consistency, are assumed. the problem is that operational models, such as labelled transition systems, tend to assume an interleaving semantics, which serialises transactions. To address this limitation, we provide an operational model that allows a weaker notion of consistency for a geographically distributed database inspired by Spanner. We reduce the timing guarantees provided by Spanner's TrueTime protocol to causal dependencies that are specified in a formal calculus.

关键词： Cloud computing distributed databases geo-replication operational semantics distributed databases Cloud computing spanners operational mode replicated databases consistency Consistency (Measurement) Semantics semiotics

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computing Origami Universal Molecules with Cyclic Tournament Forests

Computing Origami Universal Molecules with Cyclic Tournament...

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15th international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Bowers, John C. Streinu, Ileana Univ Massachusetts Sch Comp Sci Amherst MA 01003 USA Smith Coll Dept Comp Sci Northampton MA 01063 USA

Lang9;s "universal molecule" algorithm solves a variant of the origami design problem. It takes as input a metric tree and a convex polygonal region (the "paper") having a certain metric relatio... 详细信息

ISBN: (纸本)9781479930357

Lang's "universal molecule" algorithm solves a variant of the origami design problem. It takes as input a metric tree and a convex polygonal region (the "paper") having a certain metric relationship with the tree. It computes a crease-pattern which allows for the paper to "fold" to a uniaxial base, which is a 3-dimensional shape projecting onto the given tree. Lang's universal molecule algorithm runs in cubic time and quadratic space. We investigate two implementations which improve the running time to sub-cubic time. the first uses a cyclic tournament forest, a new data structure which extends kinetic tournament trees to allow for cycle splitting operations, and the second uses a priority queue to store events.

关键词： computational geometry origami tree-constrained straight-skeleton KDS tournament tree

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