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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2902卷 224-258页

作者： Robles, V. Larrañaga, P. Peña, J.M. Pérez, M.S. Menasalvas, E. Herves, V. Department of Computer Architecture and Technology Technical University of Madrid Madrid Spain Department of Computer Science and Artificial Intelligence University of the Basque Country San Sebastián Spain

Recent work in supervised learning has shown that a surprisingly simple Bayesian classifier called naïve Bayes is competitive with state of the art classifiers. This simple approach stands from assumptions of conditional independence among features given the class. Improvements in accuracy of naïve Bayes has been demonstrated by a number of approaches, collectively named semi naïve Bayes classifiers. Semi naïve Bayes classifiers are usually based on the search of specific values or structures. The learning process of these classifiers is usually based on greedy search algorithms. In this paper we propose to learn these semi naïve Bayes structures through estimation of distribution algorithms, which are non-deterministic, stochastic heuristic search strategies. Experimental tests have been done with 21 data sets from the UCI repository. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Heuristic algorithms

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Variations on truncated multiplication

Variations on truncated multiplication

引用

Euromicro Symposium on Digital System Design

作者： J.E. Stine O.M. Duverne VLSI Computer Architecture Arithmetic and CAD Research Laboratory Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL USA

Truncated multiplication can be used to significantly reduce the power dissipation for applications that do not require correctly-rounded results. This paper presents an efficient method for truncated multiplication called hybrid-correction truncation that utilizes the advantages of two previous methods to obtain lower average and maximum absolute error. Comparisons are presented contrasting power, area, and delay for all three methods compared to standard parallel multipliers. Estimates indicate that hybrid truncated multipliers dissipate slightly less power and consume slightly less area than previous methods for truncated multiplication. In addition, utilization of the hybrid truncation method can provide a method for altering the implementation within certain limits to meet a given precision.

关键词： Power dissipation Digital signal processing Delay Hardware Very large scale integration computer architecture Digital arithmetic Laboratories Application software Clocks

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A combined interval and floating-point comparator

A combined interval and floating-point comparator

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Asilomar Conference on Signals, Systems & computers

作者： C.M. Kaas J.E. Stine VLSI Computer Architecture Arithmetic and CAD Research Laboratory Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL USA

Interval arithmetic provides an efficient method for monitoring and controlling errors in numerical calculations. However, existing software packages for interval arithmetic are often too slow for numerically intensive calculations. This paper presents the design of a comparator that performs either interval or two's complement/floating-point comparisons. This comparator requires only slightly more area than a conventional floating point comparator, and provides a significant performance improvement over software implementations of interval comparisons. Both serial and parallel designs are examined and the results are implemented in AMI 0.60 /spl mu/m technology.

关键词： Hardware Digital arithmetic Very large scale integration Error correction Upper bound Coprocessors Delay estimation computer architecture Laboratories computerized monitoring

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On-line adaptive fuzzy controller: application of helicopter stabilization of the altitude of a helicopter

On-line adaptive fuzzy controller: application of helicopter...

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IEEE International Conference on Computational Intelligence for Measurement Systems and Applications (CIMSA)

作者： I. Rojas H. Pomares C.G. Puntonet F. Rojas M. Rodriguez O. Valenzuela Department of Architecture and Computer Technology University of Granada Spain Department of Applied Mathematics University of Granada Spain

When confronted with a control problem for a complicated physical process, a control engineer generally follows a relatively systematic design procedure. In this paper we design an on-line controller which is able to modify and adapt the rule base of the system with just only qualitative knowledge about the plant to be controlled. In our example, the system is an helicopter, and the objective is to control the altitude of the helicopter, when the mass of the system change, or other parameters defining the helicopter has been modified.

关键词： Helicopters Programmable control Adaptive control Fuzzy control Control systems Fuzzy systems Weight control Fuzzy sets Adaptive systems Process control

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A hierarchical fuzzy steering controller for mobile robots

A hierarchical fuzzy steering controller for mobile robots

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IEEE International Conference on Computational Intelligence for Measurement Systems and Applications (CIMSA)

作者： M. Teiner I. Rojas K. Goser O. Valenzuela Department of Electrical Engineering-Microelectronics University of Dortmund Germany Department of Computer Architecture and Computer Technology University of Granada Spain Department of Applied Mathemataic University of Granada Spain

This paper describes a hierarchical fuzzy steering controller approach to local navigation of an autonomous sensor equipped mobile robots. Two goals are considered simultaneously: obstacle avoidance, so that the robot is piloted safely in an unknown environment; and reaching an target point. A two-step approach to build a fuzzy system is presented. In the first stage signals are processed by conventional methods to get an output vector indicating the direction and the closeness of obstacles around. Stage two is a basic task steering controller, that is based on fuzzy logic. The modular structure of the first stage allows modifications on the robot. So there is no need for a redesign of the controller's architecture, when the controller is used in different applications. Adaptation to a new task is done simply by adjusting the controller to other conditions. Then the robustness of this controller is demonstrated in simulations by means of erroneous signals of the sensor modules. Finally the controller is used in combination with another basic task controller for 'Reaching an Aiming Point'. In a higher level a controller ascertains priority of the controllers and manages the resulting steering commands.

关键词： Fuzzy control Robot control Mobile robots Navigation Sensor phenomena and characterization Robot sensing systems Fuzzy systems Signal processing Fuzzy logic Robust control

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Cortical visual neuro-prosthesis for the blind: retina-like software/hardware preprocessor

Cortical visual neuro-prosthesis for the blind: retina-like ...

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International IEEE/EMBS Conference on Neural Engineering, CNE

作者： F.J. Pelayo A. Martinez S. Romero C.A. Morillas E. Ros E. Fernandez Department of Computer Architecture and Technology University of Granada Spain Department of Histology and Institute of Bioengineering University of Miguel-Hernandez Alicante Spain

The paper describes the implementation of a software/hardware (Sw/Hw) retina-like preprocessor designed for the study of bio-inspired visual processing schemes, and for experimentation in the development of a cortical visual neuro-prosthesis. The goal is to obtain, in the near future, an integrated artificial retina for a visual neuro-prosthesis prototype able to stimulate efficiently an array of intra-cortical implanted microelectrodes. The Sw/Hw platform presented is highly programmable and reconfigurable as required for experimentation, providing real-time video processing and neuromorphic stimulation. But its implementation is also devised to be finally mapped into fully portable hardware, particularized for each implanted blind individual.

关键词： Hardware Retina Prosthetics Electrodes Accidents Surgery Visual perception Pulse modulation computer architecture Biomedical engineering

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Virtual-SAP: an immersive tool for visualizing the response of building structures to environmental conditions

Virtual-SAP: an immersive tool for visualizing the response ...

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IEEE Annual International Symposium Virtual Reality

作者： D.A. Bowman M. Setareh M.S. Pinho N. Ali A. Kalita Yunha Lee J. Lucas M. Gracey M. Kothapalli Qinwei Zhu A. Datey P. Tumati Department of Computer Science Virginia Technology USA Department of Architecture Virginia Technology USA Instituto de Informática PUCRS UFRGS and Faculdade de Informática Brazil

Immersive virtual environments (VEs) offer interactive, real-time visualization capabilities for engineers, architects, and scientists. This paper presents Virtual-SAP, an immersive VE application allowing users to assess building structures and their response to various environmental conditions through an interactive design-build-test-redesign cycle. Virtual-SAP has three distinct user interfaces that support its use with a high-end, multi-tracker VE system, with a low-cost portable VE system, or on the desktop. Two of these interfaces have been proven highly usable in user testing, and the third will be tested soon. Virtual-SAP is being used for both research and education.

关键词： Buildings Data visualization Virtual environment User interfaces Testing Layout computer science computer architecture computer science education computer graphics

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Vector quantization for simulation modeling of queuing systems

Vector quantization for simulation modeling of queuing syste...

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International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： D. Radev S. Radeva Depatment of Communication Technique and Technology University of Rouse Bulgaria Department of Computer Aided Engineering University of Architecture Civil Engineering and Geodesy Sofia Bulgaria

In this research is applied simulation modeling of queuing systems with the help of vector quantization. A technique for adjusting the boundaries between classes with vector quantization is suggested. With this technique is determined the function of density distribution of the input flow. The implementation of suggested approach for simple Jackson queuing system is shown.

关键词： Vector quantization Computational modeling Queueing analysis Neural networks Communication networks computer simulation Analytical models Switches Mathematical model Probability distribution

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Performance Analysis for Dispensing Mechanism of Active Code

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International Journal of Plant Engineering and Management 2003年第1期8卷 28-34页

作者： WANG Jian-guo LI Zeng-zhi KOU Yan-an Department of Computer Science and Engineering Xi'an Institute of TechnologyXi'an 710032P.R.China Institute of Computer Architecture&Network Xi'an Jiaotong UniversityXi'an 710049P.R.China Air Force Engineering University Xi'an 710038P.R.China

The dispensing mechanism of active code is a key technology in an active network. Conventional capsule and programmable switch approaches have their own shortcomings. The DCCAN(distributed code caching for active network) mechanism presented in this paper overcomes these shortcomings. In this paper, capsule and programmable switch approaches are introduced, and their shortcomings are analyzed. The principle of the DCCAN mechanism is described. The theory analysis in transmit width based on the DCCAN mechanism and capsule approach are described. The theory analysis shows that the DCCAN mechanism has many good characteristics and can improve the efficiency of an active network. Key factors which affect the transmit width based on the DCCAN mechanism are discussed. The using condition of the DCCAN mechanism is also discussed.

关键词： DCCAN active code capsule programmable switch transmit width

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Synthesizing executable models of object oriented architectures

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Systems Engineering 2003年第4期6卷 266-300页

作者： Wagenhals, Lee W. Haider, Sajjad Levis, Alexander H. Systems Architecture Laboratory C3I Center George Mason University Fairfax VA 22030-4444 Electrical and Computer Engineering Department School of Information Technology and Engineering GMU U.S. Air Force

The U.S. department of Defense (DoD) has mandated the development of architectures to support the acquisition of systems that are interoperable and will meet the needs of military coalitions. This paper provides a general description of an architecting process based on object orientation and UML. It then provides a rationale for style constraints on the use of UML artifacts for representing DoD Command, Control, Communications, computers, Intelligence, Surveillance, and Reconnaissance (C4ISR) architectures. Finally the paper describes a mapping between the UML artifacts and an executable model based on colored Petri nets that can be used for logical, behavioral, and performance evaluation of the architecture. A procedure for the conversion is also provided. © 2003 Wiley Periodicals, Inc.

关键词： Object oriented programming

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