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检索条件"主题词=Data Flow Computing"

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Information flows in Video Coding

Information Flows in Video Coding

引用

data Compression Conference (DCC)

作者： Jia Wang Xiaolin Wu Department of Electronic Engineering Shanghai Jiaotong University Shanghai China Department of Electrical & Computer Engineering McMaster University Canada

ISBN: (纸本)9781424464258;9780769539942

We study information theoretical performance of common video coding methodologies at the frame level. Via an abstraction of consecutive video frames as correlated random variables, many existing video coding techniques, including the baseline of MPEG-x and H.26x, the scalable coding and the distributed video coding, can have corresponding information theoretical models. The theoretical achievable rate distortion regions have been completely solved for some systems while for others remain open. We show that the achievable rate region of sequential coding equals to that of predictive coding for Markov sources. We give a theoretical analysis of the coding efficiency of B frames in the popular hybrid video coding architecture, bringing new understanding of the current practice. We also find that distributed sequential video coding generally incurs a performance loss if the source is not Markov.

关键词： Video coding Random variables Predictive coding Decoding data engineering Rate-distortion Network coding data compression data flow computing Performance loss

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CODACS prototype: a platform-processor for CHIARA programs

CODACS prototype: a platform-processor for CHIARA programs

引用

International Symposium on Parallel and Distributed Processing (IPDPS)

作者： L. Verdoscia Institute for High Performance Computing and Networking (ICAR-CNR) Napoli Italy

CODACS (configurable dataflow computing system) project target is to realize a high performance reconfigurable computing system demonstrator able to directly execute in hardware dataflow graphs generated compiling programs written in CHIARA language. In this paper we present the reconfigurable environment and how it executes chunks of a dataflow graph produced by CHIARA compiler. This environment, which is transparent to the user, consists of a set of processing elements called platform-processors. Each platform-processor, based on the static dataflow model, is created by a set of identical computing units (CUs) and a reconfigurable interconnect. While CUs execute any elementary operator of the language, implement the actor described in the homogeneous high-level dataflow system model, and act according to the model firing rules, the reconfigurable interconnect allows to execute dataflow graphs directly in hardware. Furthermore, thanks to the homogeneous actor I/O conditions (one output and two input links) of the model, a one-to-one mapping between dataflow actors of the model and CUs occurs in a straightforward manner. Consequently, the platform-processor executes dataflow graphs without: a) using memory to store partial results when data tokens flow from a CU to another; b) generating control tokens during this computation so that graph executions can happen in a completely asynchronous manner. However, synchronizing CUs activities, the platform-processor architecture also allows the execution of pipeline operations.

关键词： Prototypes High performance computing data flow computing Computer architecture Field programmable gate arrays Concurrent computing Functional programming Parallel processing Computer networks Hardware

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Behavioral description in VisualVHDL and its implementation

Behavioral description in VisualVHDL and its implementation

引用

International Conference on Solid-State and Integrated Circuit Technology

作者： Qingsheng Wang Hongxi Xue Ming Su Jinian Bian Dept of Computer Science & Technology Tsinghua University China

A graphical behavioral description method using Control-data flow Graphs (CDFG) in VisualVHDL is introduced, and the algorithm generating VHDL text file from CDFG is described. It involves the application of visual la... 详细信息

ISBN: (纸本)0780330625

关键词： flow graphs Communication system control Hardware design languages Logic Arithmetic Computer science data flow computing Application software Electronics industry Electronic circuits

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A Reconfigurable, Multiprocessor System For Sonar

A Reconfigurable, Multiprocessor System For Sonar

引用

OCEANS

作者： H.M. South Applied Physics Laboratory Johns Hopkins University LAUREL MD USA

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Time-shift scheduling: fair scheduling of flows in high speed networks

Time-shift scheduling: fair scheduling of flows in high spee...

引用

International Conference on Network Protocols

作者： J.A. Cobb M.G. Gouda A. El Nahas Department of Computer Science University of Houston Houston TX USA Department of Computer Sciences University of Texas Austin Austin TX USA

We present a scheduling protocol, called time-shift scheduling, to forward data packets from multiple input flows to a single output channel. Each input flow is guaranteed a predetermined forwarding rate and an upper bound on packet delay. The protocol is an improvement over existing protocols because it satisfies the properties of low delay, fairness, and efficiency, while existing protocols fail to satisfy at least one of these properties. In time-shift scheduling, each flow is assigned an increasing timestamp, and the packet chosen for transmission is taken from the flow with the least timestamp. The protocol features the novel technique of time shifting, in which the scheduler's real-time clock is adjusted to prevent flow timestamps from increasing faster than the real-time clock. This bounds the difference between any pair of flow timestamps, thus ensuring the fair scheduling of flows.

关键词： Intelligent networks High-speed networks Processor scheduling Protocols Delay Bandwidth Computer networks data flow computing Upper bound Clocks

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Modular and incremental analysis of concurrent software systems

Modular and incremental analysis of concurrent software syst...

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IEEE International Conference on Automated Software Engineering (ASE)

作者： H. Saidi Syst. Design Lab. SRI Int. Menlo Park CA USA

Modularization and abstraction are the keys to practical verification and analysis of large and complex systems. We present in an incremental methodology for the automatic analysis and verification of concurrent software systems. Our methodology is based on the theory of abstract interpretation. We first propose a compositional data flow analysis algorithm that computes invariants of concurrent systems by composing invariants generated separately for each component. We present a novel compositional rule allowing us to obtain invariants of the whole system as conjunctions of local invariants of each component. We also show how the generated invariants are used to construct, almost for free, finite state abstractions of the original system that preserve safety properties. This reduces dramatically the cost of computing such abstractions as reported in previous work. We finally give a novel refinement algorithm that refines the constructed abstraction until the property of interest is proved or a counterexample is exhibited. Our methodology is implemented in a framework that combines deductive methods supported by theorem proving techniques and algorithmic methods supported by model checking and abstract interpretation techniques.

关键词： Software systems Safety data analysis data flow computing Costs Algorithm design and analysis Concrete System analysis and design Laboratories Concurrent computing

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Multi-party conference system designed & realized based on DSP

Multi-party conference system designed & realized based on D...

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International Conference on Signal Processing Proceedings (ICSP)

作者： Liu Wenhong Zhang Hongke Institute of Electronics and Information Beijing Jiaotong University Beijing China

In view of defects of tradition chips used for conference systems, such as poor performance and higher prices, this paper proposes the technical solution to use DSP technology to design and realize the multi-party conference system, and describes detailed designs and specified realization methods. With stable performance and requiring much lower costs, the product is now being extensively applied in Chinese railway and military systems and achieving favorable economic and social benefits.

关键词： Digital signal processing Buffer storage Digital signal processing chips Central Processing Unit Hardware Software design Noise figure data flow computing Registers Design engineering

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Computation of interprocedural definition and use dependencies

Computation of interprocedural definition and use dependenci...

引用

International Conference on Computer Languages

作者： M.J. Harrold M.L. Soffa Department of Computer Sciences University of Pittsburgh Pittsburgh PA USA

The detection of various dependencies that exist among the definitions and uses of variables in a program is necessary in many language-processing tools. The computation of definition-use dependencies that reach across procedure boundaries is considered. In particular, efficient techniques for computing interprocedural definition-use and use-definition chains and for incrementally updating the chains when a change is made in a procedure are presented. Intraprocedural definition and use information for each procedure is first abstracted and used to construct an interprocedural flow graph. The intraprocedural information is then propagated in two phases throughout the interprocedural flow graph to obtain the complete set of interprocedural reaching definitions and reachable uses. Interprocedural definition-use and use-definition chains are computed from this reaching information. The technique handles the interprocedural effects of the flow of data caused by both reference parameters and global variables, as well as supports separate compilation even in the presence of recursion. The technique has been implemented using a Sun 3/50 workstation and incorporated into an interprocedural data flow tester.< >

关键词： Testing data flow computing flow graphs data analysis Computer science Sun Workstations Information analysis Performance analysis Performance evaluation

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Design and Realization of Land Utilization database Intelligence Check System

Design and Realization of Land Utilization Database Intellig...

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International Conference on Genetic and Evolutionary computing (WGEC)

作者： GuiLin Xu Hua Jiang ZhiMing Mo Principals and Executive Office Guangxi Mech. & Elec. Industry School Nanning China Guilin University of Electronic and Technology Guilin China Computer & control college Guilin uniersity of electronic technology Guilin China Land & Resource section office Guangxi Mech. & Elec. Industry School Nanning China

The status and flow of land utilization database is studied and optimized, and an improved algorithm is proposed in the paper. Intelligent method is used in supervising and evaluating the result of the database for the first time, such as the elements of polygon area, district, linear object, designing and realizing the corresponding mathematical models and the intelligent analysis procedures to ensure the quality of database and the fast application of database.

关键词： Intelligent systems Deductive databases Error correction Algorithm design and analysis Switches data flow computing Quality assurance Graphics Genetics Mathematical model

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An approach to regression testing using slicing

An approach to regression testing using slicing

引用

International Conference on Software Maintenance (ICSM)

作者： R. Gupta M.J. Harrold M.L. Soffa Department of Computer Science University of Pittsburgh Pittsburgh PA USA Department of Computer Science Clemson University Clemson SC USA

The authors present a novel approach to data-flow-based regression testing that uses slicing type algorithms to explicitly detect definition-use pairs that are affected by a program change. An important benefit of the slicing technique is that, unlike previous techniques, no data flow history is needed nor is the recomputation of data flow for the entire program required to detect affected definition-use pairs. The program changes drive the recomputation of the required partial data flow through slicing. Another advantage is that the proposed technique achieves the same testing coverage as a complete retest of the program without the need for maintaining and updating a test suite.< >

关键词： Computer science Software testing data flow computing Software maintenance Performance evaluation Change detection algorithms History data analysis

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