For a peer-to-peer (P2P) system holding massive amount of data, an efficient and scalable search for resource sharing is a key determinant to its practical usage. Unstructured P2P networks avoid the limitations of cen...
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ISBN:
(纸本)0769522556
For a peer-to-peer (P2P) system holding massive amount of data, an efficient and scalable search for resource sharing is a key determinant to its practical usage. Unstructured P2P networks avoid the limitations of centralized systems and the drawbacks of a highly structured approach, because they impose few constraints on topology and data placement, and they support highly versatile search mechanisms. However their search algorithms are usually based on simple flooding schemes, showing severe inefficiencies. In this paper, to address this major limitation, we propose and evaluate the adoption of a local adaptive routing protocol. the routing algorithm adopts a simple Reinforcement Learning scheme (driven by query interactions among neighbors), in order to dynamically adapt the topology to peer interests. Preliminaries evaluations show that the approach is able to dynamically group peer nodes in clusters containing peers with shared interests and organized into a small world network.
Two parallel programming models applied to an adaptive finite element code for solving nonlinear simulation problems on unstructured grids are compared. As a test case we used a compressible fluid flow simulation wher...
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ISBN:
(纸本)3540410104
Two parallel programming models applied to an adaptive finite element code for solving nonlinear simulation problems on unstructured grids are compared. As a test case we used a compressible fluid flow simulation where sequences of finite element solutions form time approximations to the Euler equations. In the first model (explicit) the domain decomposition of unstructured grid is adopted, while the second (implicit) uses the functional decomposition - both applied to the preconditioned GMRES method that solves iteratively the finite element system of linear equations. Results for HP SPP1600, HP S2000 and SCI Origin2000 are reported.
the proceedings contain 53 papers. the special focus in this conference is on Software, Applications and Tools. the topics include: Solving of the alignment and scheduling problems;accuracy and stability of spatial dy...
ISBN:
(纸本)3540406735
the proceedings contain 53 papers. the special focus in this conference is on Software, Applications and Tools. the topics include: Solving of the alignment and scheduling problems;accuracy and stability of spatial dynamics simulation by cellular automata evolution;resource similarities in Petri net models of distributed systems;authentication primitives for protocol specifications;an extensible coloured Petri net model of a transport protocol for packet switched networks;parallel computing for globally optimal decision making;parallelization of alternating direction implicit methods for three-dimensional domains;an approach to assessment of heterogeneous parallel algorithms;a hierarchy of conditions for asynchronous interactive consistency;associative parallel algorithms for dynamic edge update of minimum spanning trees;the renaming problem as an introduction to structures for wait-free computing;graph partitioning in scientific simulations;process algebraic model of superscalar processor programs for instruction level timing analysis;a polymorphic type system for bulk synchronous parallel ml;towards an efficient functional implementation of the NAS benchmark ft;a fast pipelined parallel ray casting algorithm using advanced space leaping method;formal modeling for a real-time scheduler and schedulability analysis;global system image for cluster computing;asynchronous timed multimedia environments based on the coordination paradigm;component-based development of dynamic workflow systems using the coordination paradigm;an efficient marshaling framework for distributed systems;deciding optimal information dispersal for parallel computing with failures and communication-efficient parallel Gaussian elimination.
Fast, byte-addressable NVM promises near-cache latency and near memory bus throughput for file systems, which is evident by recent development of a number of NVM file systems (NVMFS). However, a key approach to measur...
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作者:
Yamaguchi, IchirouRIKEN
Higashi Hisakata 3-4-32 Kiryu Gunma 3760053 Japan Gunma Univ
Higashi Hisakata 3-4-32 Kiryu Gunma 3760053 Japan
Digital simulations of speckle patterns are reported. Wavefront propagation and scattering by a diffusely reflecting surface is represented by a generalized Huygens principle for scalar light waves. the surface roughn...
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ISBN:
(纸本)9781510622982
Digital simulations of speckle patterns are reported. Wavefront propagation and scattering by a diffusely reflecting surface is represented by a generalized Huygens principle for scalar light waves. the surface roughness is expressed by a set of random numbers that are uniformly distributed within variable range. No approximations for the propagation distances are employed between a point source and a surface point as well as between the surface point and an observation one. the 3-dimensionall intensity distributions in the diffraction field of the object that is illuminated by a spherical wave are calculated by adding many wavelets in complex amplitudes of the scattered waves at the observation point. the intensity distributions on the planes parallel and perpendicular to the object are calculated. For analyzing the speckle patterns illuminated by a multimode laser and multiple wavelength lasers incoherent superposition of the speckle patterns arising from superposition from various wavelengths or various source positions are calculated to investigate the effect of speckle suppression by addition of many speckle patterns.
the article analyses the prospects of optimizing the architecture and the execution logic of selected scripts available in MPD Root project. We considered the option of porting the scripts to allow execution on massiv...
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Semantic caching is very attractive for use in distributed computing environments based on historical queries and their descriptions, one of whose important issues is how to best maintain semantic caching using a cohe...
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ISBN:
(纸本)3540296395
Semantic caching is very attractive for use in distributed computing environments based on historical queries and their descriptions, one of whose important issues is how to best maintain semantic caching using a coherency control scheme. Withthe object of applying semantic caching into practice, the cache coherency problems including the data between the server and its caching as well as the cached data and their semantic descriptions are analyzed. this paper presents conflicts existing in semantic caching and their formal definitions, proposes the semantic caching model, and coherency control scheme, meanwhile derives update list optimization algorithm adopted in server and coherency control algorithm used in clients. Finally, the performance of the semantic caching coherency control scheme is examined and analyzed through a simulation study in detail.
Fiber optic shape sensing is innovative technology, which enables distributed structural health monitoring, providing real-time feedback on shape and position, based on smart sensors arrays, which consists of optical ...
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ISBN:
(数字)9781510631243
ISBN:
(纸本)9781510631243
Fiber optic shape sensing is innovative technology, which enables distributed structural health monitoring, providing real-time feedback on shape and position, based on smart sensors arrays, which consists of optical fiber bundles or multicore fibers with embedded strain sensors. this paper describes a numerical analysis carried out to identify the effects of uncertainty in strain measurement and core position on the accuracy of fiber optic shape sensors, taking into consideration one of the most utilized geometry for fiber optic sensing applications, the seven-core Multicore Fiber, and distinct values of core spacings (distance between outer cores and sensor axis). the Monte Carlo Method was employed to simulate the real measurement process and one million of iterations were performed for each simulation withthe aim of defining the laws of uncertainty propagation. the results of this study demonstrate the influence of core position uncertainty, strain measurement resolution and core spacing on optical shape sensors accuracy and can support the design of new sensors, predicting the achievable performance.
this book constitutes the refereed proceedings of the 7th German Conference on Multiagent Systems Technologies, MATES 2009, held in Hamburg, Germany in September 2009 - colocated withthe 10th International workshop o...
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ISBN:
(数字)9783642041433
ISBN:
(纸本)9783642041426
this book constitutes the refereed proceedings of the 7th German Conference on Multiagent Systems Technologies, MATES 2009, held in Hamburg, Germany in September 2009 - colocated withthe 10th International workshop on Computational Logic in Multi-Agent Systems (CLIMA X) and the 5th International workshop on Modelling of Objects, Components, and Agents (MOCA 2009). the 14 revised full papers, 10 short papers, and 5 exhibition papers presented together with one invited talk were carefully reviewed and selected from 44 submissions. the papers present and discuss the latest advances of research and development in the area of autonomous agents and multiagent systems ranging from theoretical and methodological issues to applications in various fields.
Dry-type air-core reactor widely used in power systems is affected by many factors such as the manufacturing process, operating environment, insulation aging. the insulation performance has deteriorated, resulting in ...
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