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Design of IIR Variable Fractional Delay Digital Filters

Design of IIR Variable Fractional Delay Digital Filters

引用

IEEE international symposium on Circuits and systems (ISCAS)

作者： Hon Keung Kwan Aimin Jiang Department of Electrical and Computer Engineering University of Windsor Windsor ONT Canada

In this paper, a novel method for designing IIR variable fractional delay (VFD) digital filters with variable and fixed denominator is presented. First of all, a peak-constrained weighted least-squares (PCWLS) method is employed to design a set of FIR fixed fractional delay (FD) filters according to given specifications. The PCWLS FIR filters are implemented by the projected least-squares (PLS) algorithm. An iterative WLS model reduction technique is utilized to design denominators, which can guarantee the stability of designed IIR VFD filter if the iteration converges. The numerator of IIR fixed FD filters can be designed by two approaches: The Approach 1 solves linear equations based on the orthogonality principle; and the Approach 2 formulates the numerator design problem as a standard quadratic programming (QP) problem. The coefficients of IIR fixed FD filters are finally approximated by polynomial functions of FD. Three sets of examples are given to demonstrate the effectiveness of the proposed method.

关键词： Delay Digital filters Finite impulse response filter IIR filters Quadratic programming Design methodology Iterative algorithms Reduced order systems Stability Nonlinear filters

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Implementing a caching and tiling map server: a Web 2.0 case study

Implementing a caching and tiling map server: a Web 2.0 case...

引用

international symposium on Collaborative Technologies and systems

作者： Zao Liu Marlon E. Pierce Geoffrey C. Fox Neil Devadasan Polis Center Indiana University-Purdue University Indianapolis Indianapolis IN USA Community Grids Lab Department of Computer Science Indiana University Bloomington IN USA

ISBN: (纸本)9781424433896;0978569911

We describe our efforts to build a caching and tiling map server that greatly improves the performance and interactivity of traditional geographic map servers. We have used this system to integrate and effectively federate 15 Indiana county map servers with Google map images and state-wide ortho-photography data. Our approach is an example of the so-called Web 2.0 style of development, in which we integrate external, third party services into a higher level service. This approach also allows for lightweight client development using relatively simple JavaScript programming libraries. We demonstrate this by building a Google Map client interface to our tile server. Finally, we discuss our initial efforts to make collaborative clients using a shared event model that captures and broadcasts browser events to other, listening browsers.

关键词： Servers Tiles Geographic information systems Time factors programming Web services Buildings

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Efficient Learning in Cellular Simultaneous Recurrent Neural Networks - The Case of Maze Navigation Problem

Efficient Learning in Cellular Simultaneous Recurrent Neural...

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IEEE symposium on Adaptive Dynamic programming and Reinforcement Learning, (ADPRL)

作者： Roman Ilin Robert Kozma Paul J. Werbos Department of Mathematical Sciences University of Memphis Memphis TN USA National Science Foundation Arlington VA USA

Cellular simultaneous recurrent neural networks (SRN) show great promise in solving complex function approximation problems. In particular, approximate dynamic programming is an important application area where SRNs have significant potential advantages compared to other approximation methods. Learning in SRNs, however, proved to be a notoriously difficult problem, which prevented their broader use. This paper introduces an extended Kalman filter approach to train SRNs. Using the two-dimensional maze navigation problem as a testbed, we illustrate the operation of the method and demonstrate its benefits in generalization and testing performance

关键词： Cellular networks Recurrent neural networks Motion planning Function approximation Dynamic programming Electronic mail Testing Cost function Equations Feedforward systems

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Computing Optimal Stationary Policies for Multi-Objective Markov Decision Processes

Computing Optimal Stationary Policies for Multi-Objective Ma...

引用

IEEE symposium on Adaptive Dynamic programming and Reinforcement Learning, (ADPRL)

作者： Marco A. Wiering Edwin D. de Jong Department of Information and Computing Sciences University of Utrecht Utrecht Netherlands

This paper describes a novel algorithm called CON-MODP for computing Pareto optimal policies for deterministic multi-objective sequential decision problems. CON-MODP is a value iteration based multi-objective dynamic programming algorithm that only computes stationary policies. We observe that for guaranteeing convergence to the unique Pareto optimal set of deterministic stationary policies, the algorithm needs to perform a policy evaluation step on particular policies that are inconsistent in a single state that is being expanded. We prove that the algorithm converges to the Pareto optimal set of value functions and policies for deterministic infinite horizon discounted multi-objective Markov decision processes. Experiments show that CON-MODP is much faster than previous multi-objective value iteration algorithms.

关键词： Dynamic programming Learning Distributed computing Heuristic algorithms Convergence Infinite horizon Intelligent systems Deductive databases Distributed databases Electronic mail

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Real-Time Dynamic Guarantee in Component-Based Middleware

Real-Time Dynamic Guarantee in Component-Based Middleware

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international symposium on Object-Oriented Real-Time Distributed Computing

作者： Cassia Yuri Tatibana Carlos Montez Romulo Silva de Oliveira Pós-Graduação em Engenharia Elétrica Universidade Federal de Santa Catarina Brazil

This paper describes an extension to the component-based programming model to support real-time dynamic guarantee for distributed applications. The extended model aims to include an acceptance tests to component-based servers at bind time. We present the mapping of our model to the CORBA Component Model, the architecture to support the dynamic guarantee in component-based middleware, the implementation of this architecture in CIAO (Component Integrated ACE ORB) and the result of experiments run to evaluate the cost of the mechanisms used

关键词： Middleware Application software Real time systems Dynamic programming Testing Computer architecture Costs Embedded system Availability Large-scale systems

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Fault-tolerance in filter-labeled-stream applications

Fault-tolerance in filter-labeled-stream applications

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international symposium on Computer Architecture and High Performance Computing (SBAC-PAD)

作者： Bruno Coutinho Dorgival Guedes Wagner Meira Jr. Renato A. Ferreira Department of Computer Science Universidade Federal de Minas Gerais Belo Horizonte Minas Gerais Brazil

Fault tolerance is a desirable feature in distributed high-performance systems, since applications tend to run for long periods of time and faults become more likely as the number of nodes in the system increase. However, most distributed environments lack any fault tolerant features, since they tend to be hard to implement and use, and often hurt performance dramatically. In this paper we discuss how we successfully added fault-tolerance to the Anthill distributed programming environment by using an application-level checkpoint/rollback solution. The programming model offers an abstraction where the programmer can easily identify points during the execution where the communication pattern is well defined, forming a consistent cut where checkpoints may be saved consistently without requiring extra communication, avoiding any domino effect during recovery from faults. We present the new abstractions for fault tolerance, describe how the solution was implemented and present performance results that show the efficiency of the solution with both regular and irregular applications.

关键词： Fault tolerance Fault tolerant systems programming profession programming environments Application software Availability Computer architecture High performance computing Computer science Fault diagnosis

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Improving quality of code generated from OCL expressions

Improving quality of code generated from OCL expressions

引用

international international symposium on Computer and Information Sciences (ISCIS)

作者： Andrius Armonas Lina Nemuraite Department of Information Systems Kaunas University of Technology Kaunas Lithuania

In this paper, we briefly describe existing principles and stages for generating code from OCL expressions pointing out the drawbacks that cause inefficiencies of the resulting code. The proposed improvement of the transformation is based on extended abstract syntax trees (AST) with context-specific attributes. Principles for defining such attributes on AST trees and an example of transformation is presented.

关键词： Object oriented modeling Unified modeling language Java programming Reverse engineering Domain specific languages DSL Information systems Business Computer architecture

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A Recurrent Control Neural Network for Data Efficient Reinforcement Learning

A Recurrent Control Neural Network for Data Efficient Reinfo...

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IEEE symposium on Adaptive Dynamic programming and Reinforcement Learning, (ADPRL)

作者： Anton Maximilian Schaefer Steffen Udluft Hans-Georg Zimmermann Department of Optimisation and Operations Research University of Ulm (EBS) Germany Department of Learning Systems Information & Communications Siemens AG Munich Germany

In this paper we introduce a new model-based approach for a data-efficient modelling and control of reinforcement learning problems in discrete time. Our architecture is based on a recurrent neural network (RNN) with dynamically consistent overshooting, which we extend by an additional control network. The latter has the particular task to learn the optimal policy. This approach has the advantage that by using a neural network we can easily deal with high-dimensions and consequently are able to break Bellman's curse of dimensionality. Further due to the high system-identification quality of RNN our method is highly data-efficient. Because of its properties we refer to our new model as recurrent control neural network (RCNN). The network is tested on a standard reinforcement learning problem, namely the cart-pole balancing, where it shows especially in terms of data-efficiency outstanding results

关键词： Neural networks Recurrent neural networks Communication system control Testing Dynamic programming Operations research Telephony Learning systems Communications technology Equations

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Dynamics of Control

Dynamics of Control

引用

Theoretical Aspects of Software Engineering (TASE)

作者： J W Sanders Matteo Turilli International Institute for Software Technology United Nations University Macau Macao China Programming Research Group Oxford University Computing Laboratory Oxford UK

This paper proposes a , the "ambit' of an action, that allows the degree of distribution of an action in a multiagent system to be quantified without regard to its functionality. It demonstrates the use of that notion in the design, analysis and implementation of dynamically-reconfigurable multi-agent systems. It distinguishes between the extensional (or system) view and intensional (or agent-based) view of such a system and shows how, using the notion of ambit, the step-wise derivation paradigm of formal methods can be used to derive the latter from the former. In closing it addresses the manner in which these ideas inform studies in the ethics of systems of artificial agents.

关键词： Multiagent systems Dynamic programming Ethics Personal digital assistants Control systems Functional programming Distributed computing Laboratories Buildings Information technology

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An Early-Reply Based Framework: Reliable Concurrency that Is Verifiable

An Early-Reply Based Framework: Reliable Concurrency that Is...

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IEEE international Symposim on High Assurance systems Engineering

作者： Stephen W. Cook Bjarne Stroustrup Scott M. Pike Southwest Research Institute Texas A and M University USA

Despite its widespread use, concurrent programming is still plagued by reliability problems, such as race conditions and deadlock, not found in sequential programs. We present a concurrency framework to help developer... 详细信息

关键词： Concurrent computing Yarn System recovery Performance gain Functional programming Object oriented modeling Reliability engineering systems engineering and theory Code standards Binary trees

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