An LMI approach to H∞ synchronization of second-order neutral master-slave systems

The H∞ synchronization problem of the master and slave structure of a second-order neutral master-slave systems with time-varying delays is presented in this paper. Delay-dependent sufficient conditions for the design of a delayed output-feedback control are given by Lyapunov-Krasovskii method in terms of a linear matrix inequality (LMI). A controller, which guarantees H∞ synchronization of the master and slave structure using some free weighting matrices, is then developed. A numerical example has been given to show the effectiveness of the method

Studies about the atomic capabilities concept for linear control systems in physical multi-agent environments

This paper shows the impact of the atomic capabilities concept to include control-oriented knowledge of linear control systems in the decisions making structure of physical agents. These agents operate in a real environment managing physical objects (e.g. their physical bodies) in coordinated tasks. This approach is presented using an introspective reasoning approach and control theory based on the specific tasks of passing a ball and executing the offside manoeuvre between physical agents in the robotic soccer testbed. Experimental results and conclusions are presented, emphasising the advantages of our approach that improve the multi-agent performance in cooperative systems

Second-order Møller-Plesset perturbation theory without basis set superposition error : II : open-shell systems

The basis set superposition error-free second-order MØller-Plesset perturbation theory of intermolecular interactions was studied. The difficulties of the counterpoise (CP) correction in open-shell systems were also discussed. The calculations were performed by a program which was used for testing the new variants of the theory. It was shown that the CP correction for the diabatic surfaces should be preferred to the adiabatic ones

Estimation of electronic coupling in π -stacked donor-bridge-acceptor systems: correction of the two-state model

Comparison of donor-acceptor electronic couplings calculated within two-state and three-state models suggests that the two-state treatment can provide unreliable estimates of Vda because of neglecting the multistate effects. We show that in most cases accurate values of the electronic coupling in a π stack, where donor and acceptor are separated by a bridging unit, can be obtained as Ṽ da = (E2 - E1) μ12 Rda + (2 E3 - E1 - E2) 2 μ13 μ23 Rda2, where E1, E2, and E3 are adiabatic energies of the ground, charge-transfer, and bridge states, respectively, μij is the transition dipole moments between the states i and j, and Rda is the distance between the planes of donor and acceptor. In this expression based on the generalized Mulliken-Hush approach, the first term corresponds to the coupling derived within a two-state model, whereas the second term is the superexchange correction accounting for the bridge effect. The formula is extended to bridges consisting of several subunits. The influence of the donor-acceptor energy mismatch on the excess charge distribution, adiabatic dipole and transition moments, and electronic couplings is examined. A diagnostic is developed to determine whether the two-state approach can be applied. Based on numerical results, we showed that the superexchange correction considerably improves estimates of the donor-acceptor coupling derived within a two-state approach. In most cases when the two-state scheme fails, the formula gives reliable results which are in good agreement (within 5%) with the data of the three-state generalized Mulliken-Hush model

New delay-dependent stability criteria for uncertain neutral systems with mixed time-varying delays and nonlinear perturbations

The problem of stability analysis for a class of neutral systems with mixed time-varying neutral, discrete and distributed delays and nonlinear parameter perturbations is addressed. By introducing a novel Lyapunov-Krasovskii functional and combining the descriptor model transformation, the Leibniz-Newton formula, some free-weighting matrices, and a suitable change of variables, new sufficient conditions are established for the stability of the considered system, which are neutral-delay-dependent, discrete-delay-range dependent, and distributeddelay-dependent. The conditions are presented in terms of linear matrix inequalities (LMIs) and can be efficiently solved using convex programming techniques. Two numerical examples are given to illustrate the efficiency of the proposed method

Callejero Digital de Andalucía Unificado

El proyecto de Callejero Digital de Andalucía Unificado (CDAU) tiene como objetivo la coordinación de iniciativas, hasta ahora divergentes, para la construcción y el mantenimiento continuo de un callejero digital único. La Junta de Andalucía lidera este proyecto en el que actualmente participan Cartociudad, las 8 diputaciones provinciales y el Ayuntamiento de Sevilla. Uno de los principales retos del proyecto es involucrar a la administración local en el mantenimiento del callejero digital. Los ayuntamientos, como órgano más cercano al territorio, son los más capacitados para detectar los cambios en vías y portales. Para la consecución de este objetivo se estructura, por un lado, un programa encaminado a consolidar una firme comunidad de usuarios que se beneficie de todas las ventajas que brinda un callejero digital. Sólo a través de esta motivación se conseguirá la participación en el proyecto. Por otro lado, se proveerá a los ayuntamientos de una aplicación Web para el mantenimiento del callejero digital. Esta aplicación permite a un ayuntamiento conectarse al sistema de la Junta de Andalucía y remitir cambios de vías y portales sustituyendo radicalmente el concepto de edición SIG tradicional. La aplicación permite que una persona, no necesariamente experta en Sistemas de Información Geográfica, sea capaz de remitir cambios en el callejero digital mediante mecanismos agiles y simplificados. El sistema, de una forma totalmente transparente al usuario, mantiene de forma automática el siempre complejo tramificado de vías y el registro histórico de las mismas. El sistema está construido en su totalidad con componentes de Software Libre (Postgis, GeoTools, GeoServer y OpenLayers) Actualmente 16 ayuntamientos mantienen la información geográfica a través de este sistema y el objetivo es que en el 2014 la totalidad de municipios mantenga el callejero digital unificado, con aportaciones de distintas consejerías, las diputaciones provinciales y el propio ciudadano