Integration of knowledge-based, qualitative and numeric tools for real time dynamic systems supervision

The proposal presented in this thesis is to provide designers of knowledge based supervisory systems of dynamic systems with a framework to facilitate their tasks avoiding interface problems among tools, data flow and management. The approach is thought to be useful to both control and process engineers in assisting their tasks. The use of AI technologies to diagnose and perform control loops and, of course, assist process supervisory tasks such as fault detection and diagnose, are in the scope of this work. Special effort has been put in integration of tools for assisting expert supervisory systems design. With this aim the experience of Computer Aided Control Systems Design (CACSD) frameworks have been analysed and used to design a Computer Aided Supervisory Systems (CASSD) framework. In this sense, some basic facilities are required to be available in this proposed framework: ·

Modelling, control and supervision for a class of hybrid systems

The aim of this thesis is to narrow the gap between two different control techniques: the continuous control and the discrete event control techniques DES. This gap can be reduced by the study of Hybrid systems, and by interpreting as Hybrid systems the majority of large-scale systems. In particular, when looking deeply into a process, it is often possible to identify interaction between discrete and continuous signals. Hybrid systems are systems that have both continuous, and discrete signals. Continuous signals are generally supposed continuous and differentiable in time, since discrete signals are neither continuous nor differentiable in time due to their abrupt changes in time. Continuous signals often represent the measure of natural physical magnitudes such as temperature, pressure etc. The discrete signals are normally artificial signals, operated by human artefacts as current, voltage, light etc. Typical processes modelled as Hybrid systems are production systems, chemical process, or continuos production when time and continuous measures interacts with the transport, and stock inventory system. Complex systems as manufacturing lines are hybrid in a global sense. They can be decomposed into several subsystems, and their links. Another motivation for the study of Hybrid systems is the tools developed by other research domains. These tools benefit from the use of temporal logic for the analysis of several properties of Hybrid systems model, and use it to design systems and controllers, which satisfies physical or imposed restrictions. This thesis is focused in particular types of systems with discrete and continuous signals in interaction. That can be modelled hard non-linealities, such as hysteresis, jumps in the state, limit cycles, etc. and their possible non-deterministic future behaviour expressed by an interpretable model description. The Hybrid systems treated in this work are systems with several discrete states, always less than thirty states (it can arrive to NP hard problem), and continuous dynamics evolving with expression: with Ki ¡ Rn constant vectors or matrices for X components vector. In several states the continuous evolution can be several of them Ki = 0. In this formulation, the mathematics can express Time invariant linear system. By the use of this expression for a local part, the combination of several local linear models is possible to represent non-linear systems. And with the interaction with discrete events of the system the model can compose non-linear Hybrid systems. Especially multistage processes with high continuous dynamics are well represented by the proposed methodology. Sate vectors with more than two components, as third order models or higher is well approximated by the proposed approximation. Flexible belt transmission, chemical reactions with initial start-up and mobile robots with important friction are several physical systems, which profits from the benefits of proposed methodology (accuracy). The motivation of this thesis is to obtain a solution that can control and drive the Hybrid systems from the origin or starting point to the goal. How to obtain this solution, and which is the best solution in terms of one cost function subject to the physical restrictions and control actions is analysed. Hybrid systems that have several possible states, different ways to drive the system to the goal and different continuous control signals are problems that motivate this research. The requirements of the system on which we work is: a model that can represent the behaviour of the non-linear systems, and that possibilities the prediction of possible future behaviour for the model, in order to apply an supervisor which decides the optimal and secure action to drive the system toward the goal. Specific problems can be determined by the use of this kind of hybrid models are: - The unity of order. - Control the system along a reachable path. - Control the system in a safe path. - Optimise the cost function. - Modularity of control The proposed model solves the specified problems in the switching models problem, the initial condition calculus and the unity of the order models. Continuous and discrete phenomena are represented in Linear hybrid models, defined with defined eighth-tuple parameters to model different types of hybrid phenomena. Applying a transformation over the state vector : for LTI system we obtain from a two-dimensional SS a single parameter, alpha, which still maintains the dynamical information. Combining this parameter with the system output, a complete description of the system is obtained in a form of a graph in polar representation. Using Tagaki-Sugeno type III is a fuzzy model which include linear time invariant LTI models for each local model, the fuzzyfication of different LTI local model gives as a result a non-linear time invariant model. In our case the output and the alpha measure govern the membership function. Hybrid systems control is a huge task, the processes need to be guided from the Starting point to the desired End point, passing a through of different specific states and points in the trajectory. The system can be structured in different levels of abstraction and the control in three layers for the Hybrid systems from planning the process to produce the actions, these are the planning, the process and control layer. In this case the algorithms will be applied to robotics ¡V a domain where improvements are well accepted ¡V it is expected to find a simple repetitive processes for which the extra effort in complexity can be compensated by some cost reductions. It may be also interesting to implement some control optimisation to processes such as fuel injection, DC-DC converters etc. In order to apply the RW theory of discrete event systems on a Hybrid system, we must abstract the continuous signals and to project the events generated for these signals, to obtain new sets of observable and controllable events. Ramadge & Wonham¡¦s theory along with the TCT software give a Controllable Sublanguage of the legal language generated for a Discrete Event System (DES). Continuous abstraction transforms predicates over continuous variables into controllable or uncontrollable events, and modifies the set of uncontrollable, controllable observable and unobservable events. Continuous signals produce into the system virtual events, when this crosses the bound limits. If this event is deterministic, they can be projected. It is necessary to determine the controllability of this event, in order to assign this to the corresponding set, , controllable, uncontrollable, observable and unobservable set of events. Find optimal trajectories in order to minimise some cost function is the goal of the modelling procedure. Mathematical model for the system allows the user to apply mathematical techniques over this expression. These possibilities are, to minimise a specific cost function, to obtain optimal controllers and to approximate a specific trajectory. The combination of the Dynamic Programming with Bellman Principle of optimality, give us the procedure to solve the minimum time trajectory for Hybrid systems. The problem is greater when there exists interaction between adjacent states. In Hybrid systems the problem is to determine the partial set points to be applied at the local models. Optimal controller can be implemented in each local model in order to assure the minimisation of the local costs. The solution of this problem needs to give us the trajectory to follow the system. Trajectory marked by a set of set points to force the system to passing over them. Several ways are possible to drive the system from the Starting point Xi to the End point Xf. Different ways are interesting in: dynamic sense, minimum states, approximation at set points, etc. These ways need to be safe and viable and RchW. And only one of them must to be applied, normally the best, which minimises the proposed cost function. A Reachable Way, this means the controllable way and safe, will be evaluated in order to obtain which one minimises the cost function. Contribution of this work is a complete framework to work with the majority Hybrid systems, the procedures to model, control and supervise are defined and explained and its use is demonstrated. Also explained is the procedure to model the systems to be analysed for automatic verification. Great improvements were obtained by using this methodology in comparison to using other piecewise linear approximations. It is demonstrated in particular cases this methodology can provide best approximation. The most important contribution of this work, is the Alpha approximation for non-linear systems with high dynamics While this kind of process is not typical, but in this case the Alpha approximation is the best linear approximation to use, and give a compact representation.

Analisis Gramatical del Lenguaje Elicitado Nivel Sencillo: A Spanish translation of the Grammatical Analysis of Elicited Language: Simple Sentence Level

This paper presents a Spanish translation of the Grammatical Analysis of Elicited Language: Simple Sentence Level. Also included are some suggested changes in vocabulary and sentence structure for the Spanish version.

A comparison of two techniques for evaluating the development of syntax in children's language: developmental sentence analysis and the CID grammatical analysis of elicited language: simple sentence level

This paper compares two language evaluation tests--Development Sentence Analysis and the CID Grammatical Analysis of Elicited Language: Simple Sentence Level.

Applicability of the CID grammatical analysis of elicted language-simple sentence level to children educated in total communication

This paper discusses a study to determine the applicability of the CID GAEL Test-Simple Sentence Level test to hearing impaired children educated in a total communication setting.

Hit the target: language activities designed to develop simple grammatical structures

This paper discusses language therapy activities for helping hearing impaired children acquire language.

Development of a simple index to predict benefit and satisfaction from amplification

The purpose of this study was to evaluate the use of non-audiological patient-based variables; amount of bother, importance of improved hearing, and expectations, as reliable predictors of benefit and satisfaction from amplification. Study findings were then used to develop two initial prognostic indices.

Primary level curriculum units based on the Simple Sentence TAGS

This paper presents four teaching curriculum units for primary level students based on Simple and Complex TAGS (Teacher Assessment of Grammatical Structures), teaching vocabulary and language structure.

Naturaleza jurídica de la negativa pura y simple de los fundamentos de hecho y de derecho de la demanda en el proceso civil

Por años hemos sido testigos por mor de la costumbre y sin detenernos a pensar mucho en ello, los abogados litigantes al contestar una demanda propuesta en contra de nuestros clientes, colocamos como primera -y a veces hasta única- “excepción” a la negativa simple y llana de los fundamentos de hecho y de derecho de la demanda, ya que ha sido corriente considerar que esta aseveración engloba a todas las posibles excepciones o defensas que un caso pueda tener. Se ha considerado entonces y se sigue haciéndolo actualmente, que la negativa simple y llana de los fundamentos de hecho y de derecho de la demanda constituye una “excepción madre” que engloba a todas las demás excepciones. Tanto es así que consignarla en el libelo de contestación a la demanda implica que el juzgador tenga presente que el demandado niega las pretensiones de la demanda y que al actor le corresponde justificarla en todos sus aspectos. En base a este criterio, bastaría con incluir únicamente dicha única “excepción” para que el juzgador pueda revisar todas los posibles argumentos o pruebas que se presenten en un caso concreto con las que se pudiera desvirtuar la demanda, aunque el demandado no los hubiere consignado e incluso supuesto o siquiera advertido. Sin embargo, tendencias procesalistas contemporáneas propugnan precisamente todo lo contrario, esto es, determinan que la naturaleza jurídica de la simple negativa no corresponde a una excepción y, más bien, consiste en un mero enunciado que -para los más extremos- ni siquiera debería existir, ya que no incluye ninguna defensa jurídicamente apropiada. En tal virtud, el hecho de que la litis se haya trabado con la negativa simple de los fundamentos de la demanda no podría obligar al juzgador, bajo pena de que su fallo sea considerado incongruente, a revisar todos los “argumentos” de las posibles defensas. Antes, contra todo anterior presupuesto, se determina que si sólo se hace tal negación, la defensa será estéril. Incluso, el Proyecto de Código de Procedimiento Civil ecuatoriano adopta este criterio, con el que concordamos, y equipara el guardar silencio o consignar excepciones ambiguas o evasivas a un tácito allanamiento a las pretensiones del actor. El presente trabajo logra especificar el alcance procesal que la negativa simple y llana de los fundamentos de hecho y de derecho de la demanda debería tener y, de la consecuencia lógica que su aplicación debería conferir, de modo que los profesionales del derecho conozcamos los parámetros específicos de su enunciado, contestado la demanda con una estrategia defensiva que realmente favorezca al cliente, tendiendo, en último término, a brindar la seguridad jurídica anhelada que busca la uniformidad de los fallos que los jueces pronuncien respecto de su consideración.

La negativa pura y simple en el ejercicio del derecho de contradicción

Esta obra analiza la actitud que el demandado debe tomar frente a la demanda y sus pretensiones en el moderno proceso civil, desde la perspectiva doctrinario y legal ecuatoriana, y la comparada, especialmente del derecho procesal latinoamericano. Con base en ello y en el análisis de la ambigua jurisprudencia ecuatoriana referente al tema redescubre y define la verdadera naturaleza jurídica de la negativa simple y llana de los fundamentos de la demanda, por años malentendido en la costumbre judicial, y describe el alcance y tratamiento que el consignarla tiene en los operadores de justicia ecuatorianos. Posteriormente, examina el enfoque y las tendencias actuales respecto de la consideración de la negativa en el proceso civil contemporáneo, principalmente respecto de la carga de la prueba ante su enunciado y la consecuente aplicación del principio de congruencia en los fallos que la analizan, de modo que estos consoliden la seguridad jurídica constitucionalmente garantizada, recalcando la urgente necesidad del cambio de paradigmas en el derecho procesal civil ecuatoriano y en sus usuarios. El estudio constituye una excelente fuente de consulta para los abogados al momento de elegir y ejecutar la estrategia idónea y debidamente fundamentada de defensa para sus clientes.

A simple model of multiple equilibria and default. CEPS Working Document No. 366, 16 July 2012

This Working Document by Daniel Gros presents a simple model that incorporates two types of sovereign default cost: first, a lump-sum cost due to the fact that the country does not service its debt fully and is recognised as being in default status, by ratings agencies, for example. Second, a cost that increases with the size of the losses (or haircut) imposed on creditors whose resistance to a haircut increases with the proportional loss inflicted upon them. One immediate implication of the model is that under some circumstances the creditors have a (collective) interest to forgive some debt in order to induce the country not to default. The model exhibits a potential for multiple equilibria, given that a higher interest rate charged by investors increases the debt service burden and thus the temptation to default. Under very high debt levels credit rationing can set in as the feedback loop between higher interest rates and the higher incentive to default can become explosive. The introduction of uncertainty makes multiple equilibria less likely and reduces their range.

The simple macroeconomics of North and South in EMU. Bruegel Working Paper 2012/12, 30 July 2012

The euro area today consists of a competitive, moderately leveraged North and an uncompetitive, over-indebted South. Its main macroeconomic challenge is to carry out the adjustment required to restore the competitiveness of its southern part and eliminate its excessive public and private debt burden. This paper investigates the relationship between fiscal and competitiveness adjustment in a stylised model with two countries in a monetary union, North and South. To restore competitiveness, South implements a more restrictive fiscal policy than North. We consider two scenarios. In the first, monetary policy aims at keeping inflation constant in the North. The South therefore needs to deflate to regain competitiveness, which worsens the debt dynamics. In the second, monetary policy aims at keeping inflation constant in the monetary union as a whole. This results in more monetary stimulus, inflation in the North is higher, and this in turn helps the debt dynamics in the South. Our main findings are: •The differential fiscal stance between North and South is what determines real exchange rate changes. South therefore needs to tighten more. There is no escape from relative austerity. •If monetary policy aims at keeping inflation stable in the North and the initial debt is above a certain threshold, debt dynamics are perverse: fiscal retrenchment is self-defeating; •If monetary policy targets average inflation instead, which implies higher inflation in the North, the initial debt threshold above which the debt dynamics become perverse is higher. Accepting more inflation at home is therefore a way for the North to contribute to restoring debt sustainability in the South. •Structural reforms in the South improve the debt dynamics if the initial debt is not too high. Again, targeting average inflation rather than inflation in the North helps strengthen the favourable effects of structural reforms.

Why is the Greek economy collapsing? A simple tale of high multipliers and low exports. CEPS Commentary, 21 December 2012

In an attempt to understand why the Greek economy is collapsing, this Commentary points out two key aspects that are often overlooked – the country’s large multiplier and a bad export performance. When combined with the need for a large fiscal adjustment, these factors help explain how fiscal consolidation in Greece has been associated with such a large drop in GDP.