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IEEE Conference on Advanced Video and Signal Based Surveillance (AVSS)

作者： Mandyam V. Srinivasan Saul Thurrowgood Dean Soccol Centre of Excellence in Vision Science Australian National University Canberra Australia

There is considerable interest in designing guidance systems for UAVs that use passive sensing (such as vision), rather than active sensing which can be bulky, expensive and stealth-compromising. Here we describe an optical sensor, based partly on principles of insect vision and optic flow analysis, for measurement and control of height above the ground. A video camera is used in conjunction with a specially shaped reflective surface to simplify the computation of optic flow, and extend the range of aircraft speeds over which accurate data can be obtained. The imaging system also provides a useful geometrical remapping of the environment, which facilitates obstacle avoidance and computation of 3-D terrain maps.

关键词： Optical sensors Image motion analysis Optical computing Insects Fluid flow measurement Optical control Cameras data flow computing Geometrical optics Aircraft

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General-purpose computations using graphics processors

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COMPUTER 2005年第8期38卷 85-88页

作者： Manocha, D Univ N Carolina Chapel Hill NC 27515 USA

High-performance 3D graphics hardware has become as ubiquitous as floatingpoint hardware. The graphics processing unit (GPU) has, alongside the CPU, become one of the desktop's two major computational components. Developers design these GPUs to operate on data streams consisting of an ordered sequence of attributed primitives like vertices or fragments. Compared to conventional CPUs, GPUs consist of high-bandwidth memories and more floating-point hardware units. General-purpose computation using graphics processors (GPGP) involves the increasing use of GPUs' computational power in scientific, database, geometric, and other nongraphics applications. These GPGP applications use GPUs primarily designed for rapid rasterization of geometric primitives to shaded pixels on the screen.

关键词： Sorting Algorithm design and analysis Computer graphics Relational databases Pipelines Frequency estimation data flow computing Physics computing Application software Computer applications

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Hyperflow: an integrated visual query and dataflow language for end-user information analysis

HyperFlow: an integrated visual query and dataflow language ...

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IEEE Symposium on Visual Languages and Human-Centric computing

作者： Dotan, D Pinter, RY Technion Israel Inst Technol Dept Comp Sci IL-32000 Haifa Israel

ISBN: (纸本)0769524435

We present Hyperflow, a novel visual language for information analysis that combines features from visual dataflow and visual query languages into a unified framework. Hyperflow is designed to make it easier for users to retrieve, filter, and manipulate information, using databases alongside e.g. web services, in a transparent, intuitive, reproducible and traceable manner. It allows users to visually design and execute information analysis processes in a single diagram. We present Hyperflow's constructs and describe the characteristics of a prototype interface we have implemented.

关键词： data flow computing database management systems information filtering information retrieval parallel languages query languages Hyperflow Web services dataflow language end-user information analysis information manipulation informati Information filtering data base language Parallel languages database management systems Web Service information analysis information retrieval data flow

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Profiling Macro data flow Graphs for Parallel Implementation of FDTD Computations

Profiling Macro Data Flow Graphs for Parallel Implementation...

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International Symposium on Parallel and Distributed computing

作者： A. Smyk M. Tudruj Polish Japanese Institute of Information Technology Warsaw Poland Institute of Computer Science Polish Academy of Sciences Warsaw Poland

In this paper, we present methodology, which enables designing and profiling macro data flow graphs that represent computation and communication patterns for the FDTD (finite difference time domain) problem in irregular computational areas. Optimized macro dataflow graphs (MDFG) for FDTD computations are generated in three main phases: generation of initial MDFG based on wave propagation area partitioning, MDFG nodes merging with load balancing to obtain given number of macro nodes and communication optimization to minimize and balance internode data transmissions. The computation efficiency for several communication systems (MPI, RDMA RB, SHMEM) is discussed. Relations between communication optimization algorithms and overall FDTD computation efficiency are shown. Experimental results obtained by simulation are presented

关键词： data flow computing flow graphs Finite difference methods Time domain analysis Concurrent computing Design methodology Merging Load management data communication Partitioning algorithms

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Design space exploration for dynamically reconfigurable architectures 05

Design space exploration for dynamically reconfigurable arch...

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Design, Automation and Test in Europe Conference and Exhibition (DATE 05)

作者： Miramond, B Delosme, JM Univ Evry Val Essonne LaMI CNRS UMR 8042 Evry France

ISBN: (纸本)0769522882

By incorporating reconfigurable hardware in embedded system architectures it has become easier to satisfy the performance constraints of demanding applications while lowering system cost. In order to evaluate the performance of a candidate architecture, the nodes (tasks) of the data flow graphs that describe an application must be assigned to the computing resources of the architecture: programmable processors and reconfigurable FPGAs, whose run-time reconfiguration capabilities must be exploited. In this paper we present a novel design exploration tool-based on a local search algorithm with global convergence properties-which simultaneously explores choices for computing resources, assignments of nodes to these resources, task schedules on the programmable processors and context definitions for the reconfigurable circuits. The tool finds a solution that minimizes system cost while meeting the performance constraints;more precisely it lets the designer select the quality of the optimization (hence its computing time) and finds accordingly a solution with close-to-minimal cost.

关键词： Space exploration Reconfigurable architectures Computer architecture data flow computing Cost function Hardware Embedded system flow graphs Field programmable gate arrays Runtime

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data management in the mission data system

Data management in the mission data system

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IEEE International Conference on Systems, Man and Cybernetics

作者： D.A. Wagner Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA

As spacecraft systems evolve from simple embedded devices to become more sophisticated computing platforms with complex behaviors it is increasingly necessary to model and manage the flow of data, and to provide uniform models for managing data that promote adaptability, yet pay heed to the physical limitations of the embedded and space environments. The mission data system (MDS) defines a software architecture in which both control theory and end-to-end data management provide the primary guiding principles. This paper describes how the MDS architecture facilitates data accountability and storage resource management.

关键词： data systems Environmental management Space vehicles data flow computing Embedded computing Physics computing Software architecture Control theory Computer architecture Resource management

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Adaptive simulation: dynamic data driven application in geophysical mass flows

Adaptive simulation: dynamic data driven application in geop...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： M.D. Jones A.K. Patra K. Dalbey E.B. Pitman A.C. Bauer Center for Computational Research State University of New York Buffalo NY USA Department of Mechanical and AeroSpace Engineering State University of New York Buffalo NY USA Department of Mathematics State University of New York Buffalo NY USA Scientific Computation Research Center Rensselaer Polytechnic Institute Troy NY USA

The ability to dynamically change data input to a computation is a key feature enabling simulation to be used in many applications. In this study, computation of geophysical mass flow is updated on the fly by changing terrain data. Accommodating such changes in a parallel environment entails new developments in parallel data management and gridding. Adaptivity, and in particular unrefinement, is critical for maintaining parallel efficiency. The application under study in this work is the result of a multidisciplinary collaboration between engineers, mathematicians, geologists, and hazard assessment personnel. In addition, adaptive gridding enables efficient use of computational resources, allowing for run-time determination of optimal computing resources. Combining these attributes allows run time conditions to inform calculations, which in turn provide up-to-date information to hazard management personnel.

关键词： Geophysics computing Computational modeling Hazards Personnel Grid computing data flow computing Environmental management Collaborative work Maintenance engineering Geology

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Implementation of finite difference schemes for the wave equation on FPGA

Implementation of finite difference schemes for the wave equ...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： E. Motuk R. Woods S. Bilbao Sonic Arts Research Centre Queen''s University Belfast Belfast UK

The computational requirements of finite difference schemes for the solution of the wave equation for physical modelling can be huge. Field programmable gate arrays (FPGAs) provide an ideal platform for performing highly parallel DSP computations, but the challenge is to be able to implement complex systems quickly and efficiently on FPGA platforms. The paper presents a system level design approach based on a dataflow model of computation using a particular finite difference scheme for the solution of a 2+1D wave equation. The results suggest that 84000 nodes could be accommodated on a single Virtex II FPGA.

关键词： Finite difference methods Partial differential equations Field programmable gate arrays Computational modeling Concurrent computing System-level design Acoustic propagation Hardware data flow computing Partitioning algorithms

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A new probabilistic load flow method

A new probabilistic load flow method

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IEEE General Meeting Power& Energy Society

作者： Chun-Lien Su Department of Marine Engineering National Kaohsiung Marine University Kaohsiung Taiwan

ISBN: (纸本)0780391578

With the advent of open access transmission, the industry has faced many uncertainties related to the system planning. This paper proposes a new probabilistic load flow algorithm to account for the uncertainties involved in computing load flow solution. The method allows probabilistic modeling of generation power injections, load data, and line parameters and computes the statistical moments of load flow solution. The moments are then used in the probability distribution curve fitting. The computation of the proposed method is more efficient than Monte Carlo simulations. Performance of the proposed method is tested and verified on IEEE six bus test system.

关键词： Load flow Uncertainty Power system planning data flow computing Equations Computer networks Distributed computing Power system analysis computing Probability distribution System testing

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RENO: a rename-based instruction optimizer

RENO: a rename-based instruction optimizer

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Annual International Symposium on Computer Architecture, ISCA

作者： V. Petric T. Sha A. Roth Department of Computer and Information Science University of Pennsylvania USA

RENO is a modified MIPS R10000 register renamer that uses map-table "short-circuiting" to implement dynamic versions of several well-known static optimizations: move elimination, common subexpression elimination, register allocation, and constant folding. Because it implements these optimizations dynamically, RENO can apply optimizations in certain situations where static compilers cannot. Cycle-level simulation shows that RENO dynamically eliminates (i.e. optimizes away) 22% of the dynamic instructions in both SPECint2000 and MediaBench. RENO/sub CF/ is responsible for 12% and 17% of the eliminations, respectively. Because dataflow dependences are collapsed around eliminated instructions, performance improves by 8% and 13%, respectively. Alternatively, because eliminated instructions do not consume issue queue entries, physical registers, or issue, bypass, register file, and execution bandwidth, RENO can be used to absorb the performance impact of a significantly scaled-down execution core.

关键词： Optimizing compilers Computer instructions Optimization methods data flow computing

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