Management and Control of Water Supply Systems

The fast increase in the energy’s price has brought a growing concern about the highly expensive task of transporting water. By creating an hydraulic model of the Water Supply System’s (WSS) network and predicting its behaviour, it is possible to take advantage of the energy’s tariffs, reducing the total cost on pumping activities. This thesis was developed, in association with a technology transfer project called the E-Pumping. It focuses on finding a flexible supervision and control strategy, adaptable to any existent Water Supply System (WSS), as well as forecasting the water demand on a time period chosen by the end user, so that the pumping actions could be planned to an optimum schedule, that minimizes the total operational cost. The OPC protocol, associated to a MySQL database were used to develop a flexible tool of supervision and control, due to their adaptability to function with equipments from various manufacturers, being another integrated modular part of the E-Pumping project. Furthermore, in this thesis, through the study and performance tests of several statistical models based on time series, specifically applied to this problem, a forecasting tool adaptable to any station, and whose model parameters are automatically refreshed at runtime, was developed and added to the project as another module. Both the aforementioned modules were later integrated with an Graphical User Interface (GUI) and installed in a pilot application at the ADDP’s network. The implementation of this software on WSSs across the country will reduce the water supply companies’ running costs, improving their market competition and, ultimately, lowering the water price to the end costumer.

Quality control and conduct of genome-wide association meta-analyses.

Rigorous organization and quality control (QC) are necessary to facilitate successful genome-wide association meta-analyses (GWAMAs) of statistics aggregated across multiple genome-wide association studies. This protocol provides guidelines for (i) organizational aspects of GWAMAs, and for (ii) QC at the study file level, the meta-level across studies and the meta-analysis output level. Real-world examples highlight issues experienced and solutions developed by the GIANT Consortium that has conducted meta-analyses including data from 125 studies comprising more than 330,000 individuals. We provide a general protocol for conducting GWAMAs and carrying out QC to minimize errors and to guarantee maximum use of the data. We also include details for the use of a powerful and flexible software package called EasyQC. Precise timings will be greatly influenced by consortium size. For consortia of comparable size to the GIANT Consortium, this protocol takes a minimum of about 10 months to complete.

Diseño de un observador Backstepping para un robot con articulación rotaria flexible

Tesis (Maestro en Ciencias de la Ingeniería Eléctrica con Especialidad en Control) UANL, 2001.

Design and Implementation of a Flexible Robot

This robot has low natural frequencies of vibration. Insights into the problems of designing joint and link flexibility are discussed. The robot has three flexible rotary actuators and two flexible, interchangeable links, and is controlled by three independent processors on a VMEbus. Results from experiments on the control of residual vibration for different types of robot motion are presented. Impulse prefiltering and slowly accelerating moves are compared and shown to be effective at reducing residual vibration.

Agrupamiento flexible de alumnos en la Educación Primaria : una respuesta a la diversidad.

Verificar la eficacia de una experiencia de innovación sobre agrupamiento flexible de alumnos en una estructura multinivel; focalizando el problema en la necesidad de responder a la diversidad existente en cada aula,diseñando, frente a la organización tradicional graduada, una nueva estructura organizativa que establece tres modalidades distintas de agrupamiento: multinivel propiamente dicho, para las Áreas de Lengua y Matemáticas; graduado para el resto de las áreas, y flexible según tareas; se contempla, así mismo una organización también flexible de profesores y una adaptación del curriculum escolar a dicha estructura.. Son objeto de investigación todos los alumnos de Primer Ciclo de Educación Primaria del CP de Las Vegas en Corvera de Asturias.. Tras la exposición del marco teórico sobre el que gira la experiencia de innovación (curriculum escolar y organización de la enseñanza) se hace una descripción del proceso de planificación y puesta en práctica de la nueva estructura organizativa y se analiza su incidencia sobre los alumnos implicados, en relación con su actitud ante la enseñanza y con su rendimiento académico.. Escalas, registros, entrevistas, diario de investigación, grabaciones de las clases, encuestas, cuestionarios, etc.. Análisis cualitativo de los registros observacionales, de los resultados de las entrevistas, del contenido del diario de investigación, de las producciones de los alumnos; porcentajes de rendimiento académico, de movilidad internivelar de los alumnos.. El análisis de los datos confirma los efectos positivos de la estructura multinivel sobre la actitud y rendimiento de los alumnos al permitir que cada uno, respetando sus condiciones de partida, progrese de acuerdo a su capacidad y a su ritmo de aprendizaje. El planteamiento cooperativo del trabajo docente permitió que los profesores mejorarán su práctica y dispusieran de un mayor control, sobre sus actividades, incrementando su desarrollo profesional.. La estructura multinivel constituye una buena alternativa al problema de atención a la diversidad al introducir elementos de mayor racionalidad y flexibilidad en el funcionamiento de los centros docentes. La rigidez de la estructura organizativa graduada y la enseñanza homogénea y uniforme que produce, apoyada básicamente en los libros de texto estandarizados, dificulta un tratamiento educativo más individualizado y la aplicación práctica de la teoría del progreso continuo..

Integració d’un sistema de visió per computador a una cèl·lula flexible de transport

L’objectiu d’aquest projecte final de carrera és millorar les prestacions de la cel·la de fabricació actual duent a terme les següents fites: integració d’un sistema de visió artificial a la plataforma. Aquest sistema ha de permetre la detecció i anàlisi dels objectes transportats, augmentant les seves possibilitats de manipulació i classificació. Es pretén eliminar la restricció actual que obliga a col•locar les peces en una posició fixa de la safata de transport; control centralitzat del procés a través d’un ordinador. El procés serà operat a través d’un computador industrial, el qual controlarà els diferents sistemes que componen la cel·la per tal que duguin a terme les seves funcions de forma coordinada; disseny i implementació d’una API del sistema. Es desenvoluparà la llibreria de control del sistema per tal de facilitar la programació del procés

Informe sobre l'estudi exploratiú realitzat en vers la técnica d'agrupament flexible d'alumnes en el cicle mitja. 'Informe sobre el estudio explorativo realizado sobre la técnica de agrupamiento flexible de alumnos en el ciclo medio'.

Elaborar y renovar los criterios que hagan falta para hacer una espiral de agrupaciones flexibles a lo largo de la escolaridad, tanto vertical como horizontal, donde cada proceso supere y refuerce el anterior y facilite el paso para experimentar una situación relajante por parte del alumno. La muestra se compone de 194 alumnos de ciclo medio divididos de la siguiente manera: 62 sujetos de tercero de EGB (33 en el grupo control, 29 en grupos experimentales), 67 sujetos de cuarto de EGB (37 en el grupo control, 30 en grupos experimentales) y 65 sujetos de quinto de EGB (33 en el grupo control, 32 en grupos experimentales). Elegidos al azar sobre la población de los alumnos de ciclo medio de EGB de la Escuela Pública Font d'en Fargas. Introducción teórica de la agrupación de alumnos. Recogida individual de información de cada alumno de ciclo medio en los siguientes campos: aptitudinal, sociométrico, motivacional, escolar. Luego se adscribe cada alumno en un grupo control o en uno de los experimentales y en horario lectivo recibe unas unidades de Matemáticas (los grupos controles con la técnica normal y los grupos experimentales con agrupación flexible de alumnos, según la primera información recogida se coloca al alumno en un grupo experimental concreto). Luego se evalúan todos los alumnos, se analizan los resultados y se extraen las conclusiones. Test d'aptituds escolars, encuesta 'ad hoc', test sociométrico, prueba evaluativa 'ad hoc'. Estadística no paramétrica de Mann-Whitney. En la formación de grupos se han de introducir criterios adicionales -ambiente familiar y otros- que permitan una agrupación más coherente intra-grupos. Hace falta introducir más diferenciación en la metodología utilizada. Es necesario diferenciar los factores incidentes para diseñar las agrupaciones flexibles, y que puedan optimizar el rendimiento de los grupos formados. En consecuencia con el punto anterior el contenido de las pruebas ha de tener ítems más discriminadores.

Estudio del progreso de la competencia comunicativa de los alumnos en inglés mediante un desarrollo curricular altamente estructurado y cerrado frente a un desarrollo curricular más abierto y flexible.

Evaluar la diferencia, aumento o no aumento de la competencia comunicativa, que se produce en dos grupos distintos de alumnos sometidos a la variable: el tipo de programación o syllabus. Comparar los resultados de un tipo de syllabus cerrado con los resultados de un syllabus abierto. Analizar la validez de algunos modelos gramaticales. Plantean diversas hipótesis. 160 alumnos de 13 y 14 años de séptimo y octavo de EGB del Instituto Veritas y del Colegio Montserrat de Madrid. Esta investigación consta fundamentalmente de dos partes. En la primera se exponen los supuestos teóricos de la misma y en la segunda se diseña la parte empírica del trabajo, que se lleva a cabo a través de un estudio longitudinal y seccional. Se combinan una serie de métodos cuantitativos que permiten una obtención de datos redundantes con una observación directa de las clases. Asimismo, se emplean métodos de triangulación para ciertas pruebas. La descripción de la situación inicial se realizó a través de una serie de tests tanto de aptitudes intelectuales como de nivel de inglés. Posteriormente, se pasó otra batería de pruebas de Inglés y una serie de pruebas finales. Las variables utilizadas son: 1. Variables dependientes (comprensión lectora, nivel gramatical, vocabulario y nivel de lengua oral en inglés, total test inicial, atención, inteligencia, fluidez verbal en castellano, IHE ambiente, IHE planificación, IHE uso de materiales, IHE asimilación, IHE capacidad de síntesis); 2. Variables independientes, los distintos tipos de instrucción en relación con los distintos modelos gramaticales; 3. Variables moderadoras: mayor capacidad verbal general inicial y el mayor IQ inicial; 4. Variable de control: programacion abierta y programación cerrada. Test inicial, tests psicológicos, pruebas de Inglés, test de habilidades orales, grabaciones de clases. Análisis comparativo, correlaciones, análisis de la diferencia de medias, preguntas de elección múltiple, hoja de cálculo Lotus, porcentajes, listado de datos, índices, valor comparable, parámetros. El aumento de competencia comunicativa se ha mostrado mayoritariamente favorable en la programación abierta. El progreso, en lo que se refiere a lectura y escritura, coherencia lingüística, vocabulario, uso de materiales de refencia, capacidad para sobreponerse a una dificultad de comunicación, es mayor en la programación abierta que en la cerrada. Algunas destrezas metacognitivas son favorecidas por la programación cerrada. Los alumnos de esta programación muestran una mayor independencia de criterio, son reflexivos, dependientes unos de otros, partidarios de estrategias metalingüísticas y emplean la memoria y la deducción. A las estrategias receptivas ambas programaciones recurren por igual. (Consultar las conclusiones de la parte teórica y de la descripción de la situación inicial en la propia investigación y las tablas de los anexos).

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.

Designing flexible procurement systems

The systems used for the procurement of buildings are organizational systems. They involve people in a series of strategic decisions, and a pattern of roles, responsibilities and relationships that combine to form the organizational structure of the project. To ensure effectiveness of the building team, this organizational structure needs to be contingent upon the environment within which the construction project takes place. In addition, a changing environment means that the organizational structure within a project needs to be responsive, and dynamic. These needs are often not satisfied in the construction industry, due to the lack of analytical tools with which to analyse the environment and to design appropriate temporary organizations. This paper presents two techniques. First is the technique of "Environmental Complexity Analysis", which identifies the key variables in the environment of the construction project. These are classified as Financial, Legal, Technological, Aesthetic and Policy. It is proposed that their identification will set the parameters within which the project has to be managed. This provides a basis for the project managers to define the relevant set of decision points that will be required for the project. The Environmental Complexity Analysis also identifies the project's requirements for control systems concerning Budget, Contractual, Functional, Quality and Time control. The process of environmental scanning needs to be done at regular points during the procurement process to ensure that the organizational structure is adaptive to the changing environment. The second technique introduced is the technique of "3R analysis", being a graphical technique for describing and modelling Roles, Responsibilities and Relationships. A list of steps is introduced that explains the procedure recommended for setting up a flexible organizational structure that is responsive to the environment of the project. This is by contrast with the current trend towards predetermined procurement paths that may not always be in the best interests of the client.

Age and flexible thinking: an experimental demonstration of the beneficial effects of increased cognitively stimulating activity on fluid intelligence in healthy older adults

The disuse hypothesis of cognitive aging attributes decrements in fluid intelligence in older adults to reduced cognitively stimulating activity. This study experimentally tested the hypothesis that a period of increased mentally stimulating activities thus would enhance older adults' fluid intelligence performance. Participants (N = 44, mean age 67.82) were administered pre- and post-test measures, including the fluid intelligence measure, Cattell's Culture Fair (CCF) test. Experimental participants engaged in diverse, novel, mentally stimulating activities for 10-12 weeks and were compared to a control condition. Results supported the hypothesis; the experimental group showed greater pre- to post-CCF gain than did controls (effect size d = 0.56), with a similar gain on a spatial-perceptual task (WAIS-R Blocks). Even brief periods of increased cognitive stimulation can improve older adults' problem solving and flexible thinking.

The 'veil' of control: exploring the attitudes and perceptions of UK design controllers

In the UK, architectural design is regulated through a system of design control for the public interest, which aims to secure and promote ‘quality’ in the built environment. Design control is primarily implemented by locally employed planning professionals with political oversight, and independent design review panels, staffed predominantly by design professionals. Design control has a lengthy and complex history, with the concept of ‘design’ offering a range of challenges for a regulatory system of governance. A simultaneously creative and emotive discipline, architectural design is a difficult issue to regulate objectively or consistently, often leading to policy that is regarded highly discretionary and flexible. This makes regulatory outcomes difficult to predict, as approaches undertaken by the ‘agents of control’ can vary according to the individual. The role of the design controller is therefore central, tasked with the responsibility of interpreting design policy and guidance, appraising design quality and passing professional judgment. However, little is really known about what influences the way design controllers approach their task, providing a ‘veil’ over design control, shrouding the basis of their decisions. This research engaged directly with the attitudes and perceptions of design controllers in the UK, lifting this ‘veil’. Using in-depth interviews and Q-Methodology, the thesis explores this hidden element of control, revealing a number of key differences in how controllers approach and implement policy and guidance, conceptualise design quality, and rationalise their evaluations and judgments. The research develops a conceptual framework for agency in design control – this consists of six variables (Regulation; Discretion; Skills; Design Quality; Aesthetics; and Evaluation) and it is suggested that this could act as a ‘heuristic’ instrument for UK controllers, prompting more reflexivity in relation to evaluating their own position, approaches, and attitudes, leading to better practice and increased transparency of control decisions.

Flexible selection of a single treatment incorporating short-term endpoint information in a phase II/III clinical trial

Seamless phase II/III clinical trials in which an experimental treatment is selected at an interim analysis have been the focus of much recent research interest. Many of the methods proposed are based on the group sequential approach. This paper considers designs of this type in which the treatment selection can be based on short-term endpoint information for more patients than have primary endpoint data available. We show that in such a case, the familywise type I error rate may be inflated if previously proposed group sequential methods are used and the treatment selection rule is not specified in advance. A method is proposed to avoid this inflation by considering the treatment selection that maximises the conditional error given the data available at the interim analysis. A simulation study is reported that illustrates the type I error rate inflation and compares the power of the new approach with two other methods: a combination testing approach and a group sequential method that does not use the short-term endpoint data, both of which also strongly control the type I error rate. The new method is also illustrated through application to a study in Alzheimer's disease. © 2015 The Authors. Statistics in Medicine Published by John Wiley & Sons Ltd.

Can qualitative methods support the development of more flexible and energy saving thermal comfort?

This paper uses examples from a Swedish study to suggest some ways in which cultural variation could be included in studies of thermal comfort. It is shown how only a slight shift of focus and methodological approach could help us discover aspects of human life that add to previous knowledge within comfort research of how human beings perceive and handle warmth and cold. It is concluded that it is not enough for buildings, heating systems and thermal control devices to be energy-efficient in a mere technical sense. If these are to help to decrease, rather than to increase, energy consumption, they have to support those parts of already existing habits and modes of thought that have the potential for low energy use. This is one reason why culture-specific features and emotional cores need to be investigated and deployed into the study and development of thermal comfort.

Dynamics of inter-modality re-weighting during human postural control

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)