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共 181 条记录，以下是121-130 订阅

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A language for multiple models of computation

A language for multiple models of computation

引用

International Workshop on Hardware/Software Codesign (CODES)

作者： D. Bjorklund J. Lilius Turku Center for Computer Science Turku Finland

We introduce a new kernel language for modeling hardware/software systems, adopting multiple heterogenous models of computation. The language has formal operational semantics, and is well suited for model checking, code synthesis etc. For different blocks of code, different scheduling policies can be applied, to reflect the different interpretations of, for example, parallelism in different models of computation. The user can add his own scheduling policies, to use or explore different models of computation.

关键词： Computational modeling Hardware design languages Processor scheduling Embedded system Parallel processing Concurrent computing Libraries System-level design Modems Multimedia systems

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Density evolution for multistage CDMA multiuser detector

Density evolution for multistage CDMA multiuser detector

引用

IEEE International symposium on Information Theory

作者： T. Tanaka Neural Computing Research Group Aston University Birmingham UK Department of Electronics & Information Engineering Tokyo Metropolitan University Hachioji Tokyo Japan

An analytical framework to analyze the stage-by-stage detection dynamics of the multistage CDMA multiuser detector is presented. The density evolution idea is applied to analyze the multistage detector. Message distribution is treated basically by a Gaussian approximation, but interstage correlation of messages is systematically taken into account, which turns out to provide significant improvement.

关键词： Multiaccess communication Detectors Biological neural networks Information analysis Gaussian approximation Equations Baseband Power system modeling Power control Radiofrequency interference

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Unified account management for high performance computing as a service with microservice architecture

Unified account management for high performance computing as...

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2018 International symposium on Grids and Clouds in conjunction with Frontiers in Computational Drug Discovery, ISGC 2018 and FCDD

作者： Cao, Rongqiang Lu, Shasha Wang, Xiaoning Xiao, Haili Chi, Xuebin Computer Network Information Center Chinese Academy of Sciences P.O. Box 349 Bejing100190 China

In recent years, High Performance computing (HPC) has developed rapidly in China. As worked in the operation and management center of China National Grid (CNGrid) and Scientific computing Grid (ScGrid) for many years, we notice that users prefer to manage their jobs at different supercomputers and clusters via a global account on different remote clients such as science gateways, desktop applications and even scripts. Therefore, we described Unified Account Management as a Service (UAMS) to access and use all HPC resources via a global account for each user in this paper. UAMS focuses on authenticaton services, and authorization services are provided by other components in middle. We addressed and solved challenges for mapping a global account to many local accounts, and provided unified account registration, management and authentication for different collaborative web gateways, command toolkits and other desktop applications. UAMS was designed in accordance with the core rules of simplicity, compatibility and reusability. In architecture design, we focused on loosely-coupled style to acquire good scalability and update internal modules transparently. In implementation, we applied widely accepted knowledge for the definitions of the RESTful API and divided them into several isolated microservices according to their usages and scenarios. For security, all sensitive data transferred in wide-network is protected by HTTPS with transport layer security outside of CNGrid and secure communication channels provided by OpenSSH inside of CNGrid. In addition, all parameters submitted to RESTful web services are strictly checked in format and variable type. For efficiency, each supercomputers provides lots accounts to UAMS at a time, and the administrators of UAMS could map different local accounts immidiately when creating global accounts. By providing these frequently important but always challenging capabilities as a service, UAMS allows users to use tens of HPC resources a

关键词： Scalability

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Advances in Robot Kinematics 1

引用

1000年

作者： J. Lenarčič F. Thomas

ISBN: (数字)9789401706575

ISBN: (纸本)9781402006968;9789048160549

This is the fifth book of the Kluwer's series Advances in Robot Kine matics. The book presents the most recent research advances in the theory, design, control and application of robotic systems, which are intended for a variety of purposes such as manipulation, manufactur ing, automation, surgery, locomotion and biomechanics. The issues addressed are fundamentally kinematic in nature, including synthesis, calibration, redundancy, force control, dexterity, inverse and forward kinematics, kinematic singularities, as well as over-constrained systems. Methods used include line geometry, quaternion algebra, screw alge bra, and linear algebra. These methods are applied to both parallel and serial multi-degree-of-freedom systems. The results should interest researchers, teachers and students, in fields of engineering and mathe matics related to robot theory, design, control and application. Each contribution in this book had been rigorously reviewed by two or three independent reviewers and 53 articles had been recommended for publication. We are happy to observe that Advances in Robot Kine matics has always attracted the most outstanding authors and has de veloped a remarkable scientific community in the area. Many important and original scientific results were for the first time reported and dis cussed in these books. All articles in this book were also reported at the eight international symposium on Advances in Robot Kinematics that was organised in June 2002 in Caldes de Malavella in Spain.

关键词： Vibration, Dynamical Systems, Control Numeric computing Mechanical Engineering Classical Mechanics Electrical Engineering

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PAM-Blox II: design and evaluation of C++ module generation for computing with FPGAs

PAM-Blox II: design and evaluation of C++ module generation ...

引用

Annual IEEE symposium on Field-Programmable Custom computing Machines (FCCM)

作者： O. Mencer Computing Sciences Center Bell Laboratories Lucent Technologies Inc. Murray Hill NJ USA

This paper explores the implications of integrating flexible module generation into a compiler for FPGAs. The objective is to improve the programmability of FPGAs, or in other words, the productivity of the FPGA programmer. We describe (1) the module generation library PAM-Blox II, the second generation of object-oriented module generators in C++, targeted at computing with FPGAs, and (2) examples of design tradeoffs and performance results using redundant representations for addition and multiplication, and technology mapping of comparison and elementary function evaluation. PAM-Blox II is built on top of a set of extensions to the gate level FPGA design library PamDC to provide a more efficient, portable, scalable, and maintainable module generator library. Using PAM-Blox II we demonstrate a simplified interface to bit-level programability. The simplification results from the bottom-up approach and a close coupling of architecture generation, module generation and gate level CAD. The tradeoffs for the module generators are based on trading area for speed and hand-optimizing technology mapping to the specific FPGA technology. As an example, we show that redundant number representations hold one key to unleashing the full potential of reconfigurability on the bit-level. The presented module generators are applied to encryption and compression to show the impact of the bit-level optimizations on application performance.

关键词： Field programmable gate arrays Libraries Algorithm design and analysis Programming profession Partitioning algorithms Productivity Design automation Cryptography Argon Microprocessors

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Compensation for nonstationary detector response in analytical varying focal-length fan-beam SPECT reconstruction

Compensation for nonstationary detector response in analytic...

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IEEE symposium on Nuclear Science (NSS/MIC)

作者： Tianfang Li Junhai Wen Zhengrong Liang Departments of Physics and Astronomy and Radiology State University of New York Stony Brook NY USA Department of Radiology State University of New York Stony Brook NY USA Departments of Radiology and Computer Science State University of New York Stony Brook NY USA

ISBN: (纸本)0780376366

In this study, a nonstationary filtering technique was developed to compensate for spatially variant detector response in varying focal-length fan-beam (VFF) collimated SPECT. First a collimator coordinate system was introduced in order to derive the geometric transfer function and the frequency-distance relation for the VFF collimator from its parallel-beam and fan-beam counterparts, and then the Fourier transform of the detector response was computed and used to construct a Wiener filter. The filter was applied to the blurred projection data before image reconstruction. Experimental results demonstrated improved resolution in reconstructed images after nonstationary filtering.

关键词： Detectors Image reconstruction Collimators Wiener filter Filtering Transfer functions Frequency Fourier transforms Concurrent computing Image resolution

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STAR: secure real-time transaction processing with timeliness guarantees

STAR: secure real-time transaction processing with timelines...

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Real-Time Systems symposium (RTSS)

作者： Kyoung-Don Kang S.H. Son J.A. Stankovic Department of Computer Science University of Virginia USA

Real-time databases are needed in security-critical applications, e.g., e-commerce, agile manufacturing, and military applications. In these applications, transactions and data items can be classified into several security levels according to their clearance and sensitivity levels. It is essential for real-time databases to prevent illegal direct/indirect transfer of sensitive data, e.g., trade secret, manufacturing, or operational data, between transactions belonging to different security levels. Further transactions should be committed within their deadlines, i.e., before the market, manufacturing, or battlefield status changes. In this paper we present a novel real-time database architecture, in which illegal direct/indirect inter-level information flows are prevented while controlling the deadline miss ratio for admitted transactions to remain below a certain threshold. In our approach, mandatory access control mechanisms are applied for security purposes. QoS management, admission control, and feedback control schemes are applied to support certain guarantees on the miss ratio against potential overload and data conflicts. A detailed simulation study shows that our approach can support the specified miss ratio preventing illegal information flows even in the presence of unpredictable workloads and varying degrees of data contention, whereas baseline approaches fail.

关键词： Data security Information security Transaction databases Application software Agile manufacturing Access control Delay Real time systems Computer science Military computing

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The danger of high-frequency spurious effects on wide microstrip line

The danger of high-frequency spurious effects on wide micros...

引用

Microwave, MTT-S International symposium

作者： F. Mesa D.R. Jackson Department of Applied Physics 1 University of Seville Seville Spain Department of Electrical and Computer Engineering University of Houston Houston TX USA

It has been found that remarkably severe spurious effects can occur in the current excited on microstrip line at moderate to high frequency, when the strip is wide (w/h > 3). This newly observed effect occurs because one or more leaky modes approaches the branch point at k/sub 0/ in the complex longitudinal wavenumber plane. This effect only occurs when the strip is wide. This effect can be disastrous, since the continuous-spectrum part of the current then decays very slowly with distance from the source, so that the total strip current excited by the source exhibits spurious oscillations out to very large distances from the source. An approximate design rule for predicting this effect is given, which is accurate for wide strips (w/h > 6).

关键词： Frequency Strips Interference Voltage Microstrip components Physics computing Crosstalk Analytical models Geometry Permittivity

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Experimental results for slow-speed testing

Experimental results for slow-speed testing

引用

VLSI Test symposium

作者： Chao-Wen Tseng J. Li E.J. McCluskey Center For Reliable Computing Departments of Electrical Engineering and Computer Science University of Stanford USA

This paper presents slow-speed testing results for two test chip experiments at Stanford CRC: Murphy and ELF35. The test speed for slow-speed testing is 1/3 of the characterized speed, at which the circuit-under-test (CUT) can operate. At nominal supply voltage, 3 out the 116 defective Murphy CUTs escaped slow-speed testing. In the ELF35 experiment, I out of the 218 defective combinational CUTs escaped slow-speed testing. The experimental data also show that the number of test escapes depends more on the quality of the applied test sets, than on the test speed at which the test sets were applied We also evaluated the effectiveness of VLV testing at characterized speed. Our results show that it missed only one defective Murphy CUT. It detected all the defective ELF35 combinational CUTs. The one defective Murphy CUT that escaped VLV testing at characterized speed is a suspected resistive open. Schmoo characterization results show it can be detected by VLV testing at characterized speed if lot-to-lot re-characterization is done to determine the VLV testing speed.

关键词： Circuit testing Voltage Circuit faults Cyclic redundancy check Timing Delay Chaos Logic testing Manufacturing Large scale integration

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Multigrain parallelism for eigenvalue computations on networks of clusters

Multigrain parallelism for eigenvalue computations on networ...

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International symposium on High Performance Distributed computing

作者： J.R. McCombs A. Stathopoulos Department of Computer Science College of William and Mary Williamsburg VA USA

Clusters of workstations have become a cost-effective means of performing scientific computations. However, large network latencies, resource sharing, and heterogeneity found in networks of clusters and Grids can impede the performance of applications not specifically tailored for use in such environments. A typical example is the traditional fine grain implementations of Krylov-like iterative methods, a central component in many scientific applications. To exploit the potential of these environments, advances in networking technology must be complemented by advances in parallel algorithmic design. In this paper, we present an algorithmic technique that increases the granularity of parallel block iterative methods by inducing additional work during the preconditioning (inexact solution) phase of the iteration. During this phase, each vector in the block is preconditioned by a different subgroup of processors, yielding a much coarser granularity. The rest of the method comprises a small portion of the total time and is still implemented in fine grain. We call this combination of fine and coarse grain parallelism multigrain. We apply this idea to the block Jacobi-Davidson eigensolver, and present experimental data that shows the significant reduction of latency effects on networks of clusters of roughly equal capacity and size. We conclude with a discussion on how multigrain can be applied dynamically based on runtime network performance monitoring.

关键词： Parallel processing Eigenvalues and eigenfunctions Computer networks Concurrent computing Delay Iterative methods Iterative algorithms Workstations Resource management Impedance

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