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Grammar-based classifier system: A universal tool for grammatical inference

WSEAS Transactions on Computers 2008年第10期7卷 1584-1593页

作者： Unold, Olgierd Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wyb. Wyspianskiego 27 50-370 Wroclaw Poland

Grammatical Inference deals with the problem of learning structural models, such as grammars, from different sort of data patterns, such as artificial languages, natural languages, biosequences, speech and so on. This article describes a new grammatical inference tool, Grammar-based Classifier System (GCS) dedicated to learn grammar from data. GCS is a new model of Learning Classifier Systems in which the population of classifiers has a form of a context-free grammar rule set in a Chomsky Normal Form. GCS has been proposed to address both regular language induction and the natural language grammar induction as well as learning formal grammar for DNA sequence. In all cases near-optimal solutions or better than reported in the literature were obtained.

关键词： Context free grammars

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Global convergence of adjoint Jacobian motion planning algorithm for the Chaplygin sleigh

Global convergence of adjoint Jacobian motion planning algor...

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作者： Malek, Lukasz Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw Poland

This paper is concerned with the adjoint Jacobian motion planning algorithm for the Chaplygin sleigh. We introduce general idea about the algorithm and prove completeness of this algorithm for the Chaplygin sleigh. Fi... 详细信息

ISBN: (纸本)9783902661555

关键词： Chaplygin sleigh Jacobian algorithm Motion planning Nonholonomic system

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Differential evolution for multi-objective optimization with self adaptation

Differential evolution for multi-objective optimization with...

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14th International Conference on Intelligent Engineering Systems, INES 2010

作者： Cichoń, A. Szlachcic, E. Kotowski, J.F. Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw Poland

ISBN: (纸本)9781424476527

In the paper an adapted version of the differential evolution algorithm has been created to solve a multiobjective optimization problem. Multi-objective Differential Evolution Algorithm using vector differences for perturbing the vector population with self adaptation is introduced. Through the combination of mutation strategies and self adaptation of crossover and differentiation constants the proposed MO algorithm performs better than the one with the simple DE scheme in terms of computation speed and quality of the generated multi-objective non-dominated solutions. © 2010 IEEE.

关键词： Multiobjective optimization

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Multistage Naive Bayes classifier with reject option for multiresolution signal representation

Multistage Naive Bayes classifier with reject option for mul...

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2nd International Conference on Pattern Recognition Applications and Methods, ICPRAM 2013

作者： Libal, Urszula Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw Poland

ISBN: (纸本)9789898565419

In the article, two approaches to pattern recognition of signals are compared: a direct and a multistage. It is assumed that there are two generic patterns of signals, i.e. a two-class problem is considered. The direct method classifies signal in one step. The multistage method uses a multiresolution representation of signal in wavelet bases, starting from a coarse resolution at the first stage to a more detailed resolutions at the next stages. After a signal is assigned to a class, the posterior probability for this class is counted and compared with a fixed level. If the probability is higher than this level, the algorithm stops. Otherwise the signal is rejected and on the next stage the classification procedure is repeated for a higher resolution of signal. The posterior probability is calculated again. The algorithm stops when the probability is higher than a fixed level and a signal is finally assigned to a class. The wavelet filtration of signal is used for feature selection and acts as a magnifier. If the posterior probability of recognition is low on some stage, the number of features on the next stage is increased by taking a better resolution. The experiments are performed for three local decision rules: naive Bayes, linear and quadratic discriminant analysis.

关键词： Probability

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Location and placement problems in information and communication systems

Location and placement problems in information and communica...

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International Conference on Broadband and Biomedical Communication

作者： Smutnicki, Czeslaw Wroclaw University of Technology Institute of Computers Engineering Control and Robotics Wroclaw Poland

ISBN: (纸本)9781424469512

The paper deals with the antenna placement problem used in wireless cell planning problem or planning of distribution of wireless sensors. The mathematical formulation of the problem with the use of various optimization criteria and constraints has been provided. This NP-hard optimization problem has been solved next by an approximate algorithm, sufficient for attacking large problem instances. In this study, we combine a greedy algorithm with the simulated annealing and/or simulated jumping approaches. The performance of each approach has been evaluated on a set of benchmarks. Results and discussion on the performance of the algorithms are provided. ©2010 IEEE.

关键词： Simulated annealing

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Preserving continuity of services exposed to security incidents

Preserving continuity of services exposed to security incide...

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6th International Conference on Emerging Security Information, Systems and Technologies, SECURWARE 2012

作者： Caban, Dariusz Walkowiak, Tomasz Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw Poland

ISBN: (纸本)9781612082097

System reconfiguration is often the only means of preserving the continuity of business-critical services after a successful penetration attack. When a fragment of the system has to be isolated (to prevent escalation of damages caused by the incident), then the other system components need to take over the functions normally performed by the affected servers. The paper addresses a specific aspect of this reconfiguration - the need to predict its impact on the availability of the services. It proposes an efficient approach, based on network simulation, for assessing the response times of services after reconfiguration. This takes into consideration the identified resource consumption interactions between the co-located services. All the presented simulation results are verified on testbed installations. The accuracy of the simulation method allows prediction of the risk of system overloading as an effect of reconfiguration.

关键词： Reconfiguration Simulation System dependability

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Application of artificial neuron networks and hurst exponent to forecasting of successive values of a time series representing environmental measurements in an intelligent building

Application of artificial neuron networks and hurst exponent...

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14th International Conference on Computer Aided Systems Theory, EUROCAST 2013

作者： Stachno, Andrzej Jablonski, Andrzej Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw Poland

ISBN: (纸本)9783642538551

control systems for intelligent buildings based on environmental measurements. The information contained in the measurement data in many cases are independent and chaotic. You can not interact with the control system, but only to monitor. In many cases, the use of measurement data for the purpose of building automation control, requires the use of forecasting systems. For the needs forecasting this type of measurement data apply artificial neural networks. Learning provides a mechanism to adjust its internal parameters of artificial neural network to characterize the trend of the time series reflects the measurement data. For time series with greater variability of smoothing is necessary. The intention initial classification time series smoothing and allows the use of artificial neural networks to forecast the next value of the time series irrespective of their volatility. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Forecasting

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Learning context-free grammars from partially structured examples: Juxtaposition of GCS with TBL

Learning context-free grammars from partially structured exa...

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7th International Conference on Hybrid Intelligent Systems, HIS 2007

作者： Unold, Olgierd Cielecki, Lukasz Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Poland

ISBN: (纸本)0769529461

This paper juxtaposes performance of the grammar-based classifier system (GCS) with tabular representation algorithm (TBL) on the task of inducing context-free grammars from partially structured examples. In both cases structured examples rapidly improve the efficiency of learning algorithms, although there are substantial differences in the way they work. GCS requires more attention while setting initial system parameters and structured examples provide a bit more information than in TBL but on the other hand it is more efficient when tested against the same examples ' sets. © 2007 IEEE.

关键词： Context free grammars

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A definition of the extended Jacobian inverse kinematics algorithm for mobile robots 9

A definition of the extended Jacobian inverse kinematics alg...

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2007 9th European control Conference, ECC 2007

作者： Tchon, Krzysztof Jakubiak, Janusz Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw50-372 Poland

ISBN: (纸本)9783952417386

Using control theoretic concepts we present a definitional procedure of extended Jacobian inverse kinematics algorithms for mobile robots. As a point of departure we assume a representation of the mobile robot kinematics as the end point map of a driftless control system with outputs. The space of admissible control functions of this system plays the role of the configuration space of the mobile robot, the system output space corresponds to the taskspace, so that the mobile robot kinematics transform the configuration space into the taskspace. The extended Jacobian inverse kinematics algorithm is obtained by means of the continuation method, and is based on the extended Jacobian inverse. The main step of its derivation consists in extending the original mobile robot kinematics to a map of the configuration space into itself. To this aim the configuration space is decomposed into a finite dimensional subspace, isomorphic to the taskspace, and the remaining quotient subspace. In compliance with this decomposition an augmenting kinematics map is introduced. The original kinematics and the augmenting kinematics constitute the extended kinematics. In a region free from singularities the inverse of the derivative of the extended kinematics defines the extended Jacobian inverse. By design, the extended Jacobian inverse kinematics algorithm has the property of repeatability. In the paper, the general procedure is exemplified by a derivation of the extended Jacobian inverse for a chained form system that is feedback equivalent to the kinematics of the kinematic car type mobile robot. An examination of algorithmic singularities of this algorithm is carried out. Computer simulations illustrate the performance of the algorithm. © 2007 EUCA.

关键词： Mobile robots

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Error correction procedures for a hardware implementation of the advanced encryption standard

Error correction procedures for a hardware implementation of...

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作者： Biernat, Janusz Czapski, Mariusz Nikodem, Maciej Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Poland

ISBN: (纸本)8374810351

The Advanced Encryption Standard algorithm itself does not guarantee error free operation or detection of arising errors. Contemporary research has shown that even single bit errors strongly affect the output of the algorithm. Moreover an attacker may maliciously induct errors during the run of the AES in order to perform cryptanalysis and recover the encryption secret key. In this paper we propose an extension of error detection code for AES, known from an open literature. The implementation of our idea leads to the improvement of error detection ability and reduces of the probability of successful fault analysis below 2-7. Copyright 2006 IFAC.

关键词： Fault tolerance

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