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检索条件"任意字段=Applied Computing 2002: Proceeedings of the 2002 ACM Symposium on Applied Computing"

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A blind audio watermarking algorithm with self-synchronization

A blind audio watermarking algorithm with self-synchronizati...

引用

IEEE International symposium on Circuits and Systems (ISCAS)

作者： Jiwu Huang Yong Wang Y.Q. Shi Department of Electronics Zhongshan University Guangzhou China Department of ECE New Jersey Institute of Technology Newark NJ USA

A blind audio information bit hiding algorithm with effective synchronization is proposed in this paper. The algorithm embeds synchronization signals in the time domain to resist the attacks such as cropping while keeping the computation for resynchronization lower. The watermark is placed in blockwise DCT coefficients of the original audio exploiting the HAS (Human Audio System) features. To lower the bit error rate of the watermark in extraction, error-correcting coding is applied. The experimental results show that the hidden imperceptible watermark is robust to the attacks caused by additive noise, MP3 coding, and cropping.

关键词： Watermarking Resists Embedded computing Discrete cosine transforms Humans Audio systems Bit error rate Noise robustness Additive noise Digital audio players

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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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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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STAR: secure real-time transaction processing with timeliness guarantees

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

引用

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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Communication characteristics of large-scale scientific applications for contemporary cluster architectures

Communication characteristics of large-scale scientific appl...

引用

International symposium on Parallel and Distributed Processing (IPDPS)

作者： J.S. Vetter F. Mueller Center for Applied Scientific Computing Lawrence Livemore National Laboratory Livermore CA USA Department of Computer Science North Carolina State University Raleigh NC USA

This paper examines the explicit communication characteristics of several sophisticated scientific applications, which, by themselves, constitute a representative suite of publicly available benchmarks for large cluster architectures. By focusing on the Message Passing Interface (MPI) and by using hardware counters on the microprocessor, we observe each application's inherent behavioral characteristics: point-to-point and collective communication, and floating point operations. Furthermore, we explore the sensitivities of these characteristics to both problem size and number of processors. Our analysis reveals several striking similarities across our diverse set of applications including the use of collective operations, especially those collectives with very small data payloads. We also highlight a trend of novel applications parting with regimented, static communication patterns in favor of dynamically evolving patterns, as evidenced by our experiments on applications that use implicit linear solvers and adaptive mesh refinement. Overall, our study contributes a better understanding or the requirements of current and emerging paradigms of scientific computing in terms of their computation and communication demands.

关键词： Large-scale systems Application software Computer architecture Scientific computing Message passing Payloads Adaptive mesh refinement Distributed computing Analytical models Laboratories

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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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Matching criteria for radargrammetry

Matching criteria for radargrammetry

引用

IEEE International symposium on Geoscience and Remote Sensing (IGARSS)

作者： F. Tupin J.-M. Nicolas Dépt. TSI Ecole Nationale Supérieure des TéIécommunications Paris France

The aim of this paper is to study the use of cross-correlation for radargrammetric applications. Two other criteria derived from the mean square error analysis are proposed. These three criteria are studied first through their distributions computed using simulated data, and secondly when applied on synthetic and real SAR images. Besides, the influence of the use of logarithm or averaged data is studied.

关键词： Random variables Maximum likelihood estimation Mean square error methods Synthetic aperture radar Speckle Optical filters Filtering Image analysis Error analysis Distributed 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...

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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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Multigrain parallelism for eigenvalue computations on networks of clusters

Multigrain parallelism for eigenvalue computations on networ...

引用

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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Modular HLA RTI services: the GRIDS approach

Modular HLA RTI services: the GRIDS approach

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International Workshop/symposium on Distributed Simulation and Real-Time Applications (DS-RT)

作者： S.J.E. Taylor R. Sudra Centre for Applied Simulation Modelling Department of Information Systems and Computing Brunei University Uxbridge UK

The Generic Runtime Infrastructure for Distributed Simulation (GRIDS) has been developed to investigate modularity issues in distributed simulation. It could be argued that although the HLA RTI is a widespread solution to distributed simulation, it cannot include all possible services. This paper investigates an approach to extending the distributed simulation services available in the HLA RTI. One example of this is bridging support for HLA/DIS legacy integration. This paper therefore presents GRIDS, how GRIDS can be used to provide modular service support for the HLA RTI, and a case study on legacy integration to demonstrate our approach.

关键词： Computational modeling Middleware Runtime Standards development Information systems Distributed computing Grid computing Standardization Stability Job production systems

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