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This work is concerned with duality of controllability and observability of Timed continuous Petri nets (TCPNs). Based on the duality definition presented in [4] for (discrete) Petri nets, a procedure for computing a dual system of a given TCPN, in a particular configuration, is provided in this work. Furthermore, it is demonstrated that the rank of the controllability matrix of a TCPN and the rank...
Differential evolution (DE) was originally designed to solve continuous optimization problems, but recent works have been investigating this algorithm for tackling combinatorial optimization (CO), particularly in permutation-based combinatorial problems. However, most DE approaches for combinatorial optimization are not general approaches to CO, being exclusive for per mutational problems and often...
In this article, we propose an objective method to evaluate stroke-width measures. With this aim, we discuss the relevance of features based on the stroke width for document analysis. Then, we point out that most of the consulted references have a vague definition of stroke width. Because of this, we propose a formal definition of the stroke-width and remark the linearity of the stroke-width as an...
This paper presents the development of a single-phase grid-connected wind energy conversion system (WECS) that uses a modified PLL. The WECS development is based on the use of the low cost 30 MIPS Digital Signal controller (DSC) dsPIC30f3011. The modified single-phase PLL is based on the PQ theory, where a lag structure based on an integrator is proposed instead of a conventional lag structure. The...
Transmission of videos in error prone environments such as mobile communications, may lead to video corruption or loss so that received visual quality is degraded. Therefore, it is essential to implement efficient and low complexity error concealment methods which allow visually reducing the degradation caused by the missing information. The contribution of this work is to report the results of a...
This paper deals with distributed model-based diagnosers of partially observable Discrete event systems (DES). The problem of partitioning an interpreted Petri net (IPN) diagnoser model into m modules is addressed; in such a manner that minimal communication among modules is guaranteed. Two main contributions cope with this problem. First the communication-dependence fault graph (CDFG) is introduced;...
In this paper, a decentralized control scheme for group formation and trajectory tracking of multi-agent systems is designed. In this scheme, each agent dynamics is represented by a single-input single-output linear systemand the information that each controller requires is only the output of the others agents. With the proposed decentralized control law, multiagent system tracks asymptotically the...
In a previous work, the authors have shown how the Principal Components Analysis (PCA) of a set of human walking paths provides sufficient information to derive a linear human-like path generator based on examples. The present work aims to provide an analysis of human walking paths from the perspective of multilinear algebra, using the n-mode Singular Value Decomposition (SVD). This decomposition...
This paper deals with supervisory control of discrete event systems (DES) modeled by interpreted Petri nets (IPN). In the approach herein proposed, both, the specification and the system model are described by IPN, however, the specification describes a state subset that the specification must reach. It also captures the order in which these states must be reached. Based on this framework, this paper...
This work, presents the design of a Joint State-Mode observer for SLS, where the state of both parts, continuous and discrete, are observed The continuous part is represented by a family of linear systems (LS) and the discrete part is represented by an interpreted Petri net (IPN), enlarging the class of systems that can be represented and adding structural information to the system. The design of...
This paper deals with Petri net model reconfiguration of discrete manufacturing systems. A technique for model transformation is proposed as a base of a fault recovery strategy; this novel technique is based on the structural redundancies of the model. A set of sub-models derived from t-invariants together with a XOR composition operation form an abelian group allowing adapting the model to new operation...
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