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Certainty and expertness-based credit assignment for cooperative Q-Learning agents with an AND-type task

Certainty and expertness-based credit assignment for coopera...

引用

International Conference on Neural Information processing

作者： A. Harati M.N. Ahmadabadi School of Intelligent Systems Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Control and Intelligent Processing Center of Excellence & AI and Robotics Laboratory Department of Electrical and Computer Engineering University of Tehran Tehran Iran

In multiagent reinforcement learning, inter-agent credit assignment is a fundamental problem, since a single scalar reinforcement signal is the only reliable feedback that teams of learning agents receive. This problem is more critical in groups of independent learners with a joint task. In this research, it is assumed that a critic agent receives the environment feedback and assigns a proper credit to each agent using some measures. Three of such measures for a team of cooperative agents with a parallel and AND-type task are introduced. These measures somehow compare the agents' knowledge. One of these criteria, called normal expertness, is a non-relative measure while two other ones (certainty and relative normal expertness) are relative measure. It is experimentally shown that relative measures work better as they contain more information for the critic agent.

关键词： Feedback Intelligent agent Intelligent robots Process control Control systems Intelligent control Artificial intelligence Robot kinematics Physics computing Reliability engineering

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Text scanner with text detection technology on image sequences

Text scanner with text detection technology on image sequenc...

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International Conference on Pattern Recognition

作者： Keechul Jung Kwang In Kim T. Kurata M. Kourogi JungHyun Han Pattern Recognition and Image Processing Laboratory Michigan State University USA Artificial Intelligence Laboratory KAIST South Korea National Institute for Advanced Industrial Science and Technology Japan School of Electrical and Computer Engineering Sung Kyun Kwan University South Korea

ISBN: (纸本)076951695X

We propose a text scanner which detects wide text strings in a sequence of scene images. For scene text detection, we use a multiple-CAMShift algorithm on a text probability image produced by a multi-layer perceptron. To provide enhanced resolution of the extracted text images, we perform the text detection process after generating a mosaic image in a fast and robust image registration method.

关键词： Image sequences Layout Image registration Cameras Parameter estimation Videos Pixel Image processing Robustness Optical character recognition software

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Public-domain Matlab program to generate highly optimized VHDL for FPGA implementation

Public-domain Matlab program to generate highly optimized VH...

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2001 IEEE International Symposium on Circuits and Systems, ISCAS 2001

作者： Tan, Kah-Howe Fung-Leong, Wen Kadam, Sameer Soderstrand, M.A. Johnson, Louis G. Digital Signal Processing and Communications Laboratory School of Electrical and Computer Engineering Oklahoma State University Stillwater OK 74078 United States

ISBN: (纸本)0780366859

Savings ranging from 36% to 53% in FPGA resources are achieved through a filter design program that simultaneously applies optimum scaling, careful selection of filter order and use of fixed-coefficient multipliers designed with CSD and/or DM techniques. The output of the program is a VHDL description of the optimized hardware that is suitable as input to the Synplify Pro computer program that generates highly optimized FPGA circuits for Xilinx and other FPGA's. © 2001 IEEE.

关键词： Field programmable gate arrays (FPGA)

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FIR filter design program that matches specifications rather than filter coefficients results in large savings in FPGA resources

FIR filter design program that matches specifications rather...

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Asilomar Conference on Signals, Systems & computers

作者： Kah-Howe Tan Wen Fung Leong K. Kaluri M.A. Soderstrand L.G. Johnson Digital Signal Processing and Communications Laboratory School of Electrical and Computer Engineering Oklahoma State University Stillwater OK USA

ISBN: (纸本)078037147X

The standard FIR filter design approach which uses ideal filter coefficients determined by a filter design algorithm such as remez exchange, windowing, or similar techniques, rounding or truncating the ideal coefficients to a specific number of bits and realizing the digital filter using one of the standard FIR filter structures generates filters with considerably more hardware than is required to meet the original specifications. By using a new public-domain computer program written in Matlab, FIR filters can be designed with one-third of the hardware required using standard techniques. In a typical filter example described by the Xilinx application notes, an 8-tap FIR filter can be reduced using the CSD/DM technique from 584 slices to only 186 slices for Synplify Pro 6.0 and from 645 slices to only 214 slices for FPGA express 3.4.

关键词： Finite impulse response filter Matched filters Hardware Field programmable gate arrays Digital filters Application software Delta modulation Algorithm design and analysis Communication standards Signal design

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Public-domain Matlab program to generate highly optimized VHDL for FPGA implementation

Public-domain Matlab program to generate highly optimized VH...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Kah-Howe Tan Wen Fung-Leong S. Kadam M.A. Soderstrand L.G. Johnson Digital Signal Processing and Communications Laboratory School of Electrical and Computer Engineering Oklahoma State University Stillwater OK USA

ISBN: (纸本)0780366859

关键词： MATLAB Field programmable gate arrays Delta modulation Hardware Adders Finite impulse response filter Circuits Digital filters Signal design Signal generators

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An overview of security issues in streaming video

An overview of security issues in streaming video

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International Conference on Information Technology: Coding and Computing (ITCC)

作者： E.T. Lin G.W. Cook P. Salama E.J. Delp Video and Image Processing Laboratory(VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Electrical and Computer Engineering Purdue School of Engineering and Technology Purdue University Indiana University Indianapolis IN USA

The article describes some of the security issues in streaming video over the Internet. If high quality video sequences are to be delivered to computers and digital television systems over the Internet in our "di... 详细信息

ISBN: (纸本)0769510620

关键词： Streaming media Video compression Bandwidth Internet Protection Decoding Security Video sequences IP networks Authentication

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A Java graphical user interface for large-scale scientific computations in distributed systems 4

A Java graphical user interface for large-scale scientific c...

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4th International Conference/Exhibition on High Performance Computing in the Asia-Pacific Region, HPC-Asia 2000

作者： Shen, X. Thiruvathukal, G. Liao, W. Choudhary, A. Singh, A. Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States School of Computing Telecommunications and Information Sciences JHPC Laboratory DePaul University United States

ISBN: (纸本)0769505902

Large-scale scientific applications present great challenges to computational scientists in terms of obtaining high performance and in managing large datasets. These applications (most of which are simulations) may employ multiple techniques and resources in a heterogeneously distributed environment. Effective working in such an environment is crucial for modern large-scale simulations. In this paper, we present an integrated Java graphical user interface (IJ-GUI) that provides a control platform for managing complex programs and their large datasets easily. As far as performance is concerned, we present and evaluate our initial implementation of two optimization schemes: data replication and data prediction. Data replication can take advantage of 'temporal locality' by caching the remote datasets on local disks;data prediction, on the other hand, provides prefetch hints based on the datasets' past activities that are kept in databases. We first introduce the data contiguity concept in such an environment that guides data prediction. The relationship between the two approaches is discussed. © 2000 IEEE.

关键词： Forecasting

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Multimedia security: Does signal processing have a place in securing the digital world?

Multimedia security: Does signal processing have a place in ...

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European Signal processing Conference (EUSIPCO)

作者： Edward J. Delp Video and Image Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette Indiana

With the recent growth of networked multimedia systems, techniques are needed to prevent (or at least deter) the illegal copying, forgery and distribution of digital media elements such as audio, images and video. The problem is that a copy of a media element is identical to the original. It is also desirable to determine where and by how much a multimedia element has been changed from the original. One classical approach to the problem of protecting "digital content" has been the use of cryptographic methods such as encryption and authentication. Recently other methods have been proposed to improve one's claim of ownership over a digital media element by inserting a small amount of distortion directly into the media element. This distortion, known as a digital watermark, can be used to uniquely identify the owner of the content. Digital watermarking research is mainly the domain of the signal processing community that is very naive when considering real world security problems. Also the attitude of the academic community that it has the "right" to copy and reproduce any multimedia element is curious at best and perhaps conveys the wrong message to our students. The use of the "Lena" image is a good example of this. In this talk I will survey the current state of multimedia security and describe important research issues. I will also express some concern that perhaps we in the signal processing community might want to understand the "security scenario" before making grandiose claims about how our latest watermarking technique will save the world!

关键词： Multimedia communication Media Signal processing Watermarking Communities Streaming media

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A rate-distortion approach to wavelet-based encoding of predictive error frames

A rate-distortion approach to wavelet-based encoding of pred...

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IEEE International Conference on Image processing

作者： E. Asbun P. Salama E.J. Delp Video and Image Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Electrical and Computer Engineering Purdue School of Engineering and Technology Indiana University-Purdue University Indianapolis Indianapolis IN USA

We develop a framework for efficiently encoding predictive error frames (PEF) as part of a rate scalable, wavelet-based video compression algorithm. We investigate the use of rate-distortion analysis to determine the significance of coefficients in the wavelet decomposition. Based on this analysis, we allocate the bit budget assigned to a PEF to the coefficients that yield the largest reduction in distortion, while maintaining the embedded and rate scalable properties of our video compression algorithm.

关键词： Rate-distortion Encoding Image coding Video compression computer errors Redundancy Wavelet analysis Decoding Scalability Transform coding

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A novel application development environment for large-scale scientific computations 00

A novel application development environment for large-scale ...

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Proceedings of the 14th international conference on Supercomputing

作者： X. Shen W. Liao A. Choudhary G. Memik M. Kandemir S. More G. Thiruvathukal A. Singh Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston IL Department of Computer Science and Engineering The Pennsylvania State University University Park PA School of Computing Telecommunications and Information Sciences JHPC Laboratory Depaul University

Our results demonstrate that our novel application development environment provides both ease-of-use and high performance for large-scale, I/O-intensive scientific applications.

ISBN: (纸本)9781581132700

Our results demonstrate that our novel application development environment provides both ease-of-use and high performance for large-scale, I/O-intensive scientific applications.

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