Search results for "Control system"
showing 10 items of 971 documents
Controllo di gestione nelle PMI e consulenti esterni
2019
L'articolo considera, a partire da un'indagine di campo su un campione di professionisti, il loro ruolo, in particolare quello degli esperti contabili e dei dottori commercialisti, nella diffusione degli strumenti e delle metodiche del controllo di gestione nell'ambito delle PMI. Management control in SMEs and external consultants. The issue of management control in small and medium-sized enterprises has long been the subject of scientific debate, as well as a key point of professionals’ interest. Starting from the recognition of the role played by the latter, this paper aims to investigate the type and level of dissemination of management control tools in SMEs by adopting the perspective o…
Geometry and feedback classification of low-dimensional non-linear control systems
2006
The purpose of this thesis is the study of the local and global differential geometry of fully nonlinear smooth control systems on two-dimensional smooth manifolds. We are particularly interested in the feedback-invariants of such systems. In a first part we will use the Cartan's moving frame method in order to determine these invariants and we will see that one of the most important feedback-invariants is the control analogue to the Gaussian curvature of a surface. As we will explain it, the control curvature reveals very precious information on the optimal synthesis of time optimal problems. In a second part we will construct some microlocal normal forms for time optimal control systems a…
Computational Techniques for the Analysis of Small Signals in High-Statistics Neutrino Oscillation Experiments
2020
The current and upcoming generation of Very Large Volume Neutrino Telescopes – collecting unprecedented quantities of neutrino events – can be used to explore subtle effects in oscillation physics, such as (but not restricted to) the neutrino mass ordering. The sensitivity of an experiment to these effects can be estimated from Monte Carlo simulations. With the high number of events that will be collected, there is a trade-off between the computational expense of running such simulations and the inherent statistical uncertainty in the determined values. In such a scenario, it becomes impractical to produce and use adequately-sized sets of simulated events with traditional methods, such as M…
Robust delay-dependent H∞ control of uncertain time-delay systems with mixed neutral, discrete, and distributed time-delays and Markovian switching p…
2011
Author's version of an article published in the journal: IEEE Transactions on Circuits and Systems I: Regular Papers. Also available from the publisher at: http://dx.doi.org/10.1109/tcsi.2011.2106090 The problem of robust mode-dependent delayed state feedback H ∞ control is investigated for a class of uncertain time-delay systems with Markovian switching parameters and mixed discrete, neutral, and distributed delays. Based on the LyapunovKrasovskii functional theory, new required sufficient conditions are established in terms of delay-dependent linear matrix inequalities for the stochastic stability and stabilization of the considered system using some free matrices. The desired control is …
L'articulation des usages diagnostique et interactif d'un seul et même système de contrôle de gestion : le cas d'un système d'indicateurs environneme…
2013
With the conceptual framework of control levers of Simons (1995), this article shows how to coordinate diagnostic and interactive uses of the same "management control system" (in this case a system of environmental indicators) for the deployment and the emergence of new strategies. In contrast to the literature, we propose an articulation "in parallel" of levers of control as alternative to sliding levers of control. These results are obtained from a case study in a French wine and spirits subject to large strategic environmental uncertainties.
Papel de los sistemas de control de gestión en el éxito de la trasformación digital: influencia en las capacidades dinámicas digitales
2023
La rápida evolución de las tecnologías de la información (TI) y sus aplicaciones empresariales está obligando a las organizaciones a realizar esfuerzos constantes para seguir siendo competitivas. La nueva economía digital, así como el entorno disruptivo y cambiante en el que operan las empresas, fuerza a los directivos a priorizar estratégicamente procesos de adaptación y transformación, replanteando su perspectiva estratégica más allá de la implantación de nuevas tecnologías (Rogers, 2016), para provocar un cambio profundo en toda la organización. Este proceso es conocido, aunque no siempre es bien entendido, como transformación digital (TD). La TD modifica el alcance y la velocidad del la…
Transient stability simulation of a fixed speed wind turbine by Matlab/Simulink
2007
This paper describes the dynamic behavior of a typical fixed speed wind turbine connected to the grid; the model is developed in the simulation tool Matlab/Simulink and created as a modular structure. The pitch control system is used for stabilization of the wind turbine at grid faults. In this way, voltage stability of the system with grid-connected wind turbines can be improved by using blade-angle control for a temporary reduction of the wind turbine power during a short-circuit fault in the grid. This paper shows a new variable control for maintaining of voltage stability, when a three-phase fault is applied close to the wind turbine and cleared by disconnecting the affected line. In th…
Memetic Compact Differential Evolution for Cartesian Robot Control
2010
This article deals with optimization problems to be solved in the absence of a full power computer device. The goal is to solve a complex optimization problem by using a control card related to portable devices, e.g. for the control of commercial robots. In order to handle this class of optimization problems, a novel Memetic Computing approach is presented. The proposed algorithm employs a Differential Evolution framework which instead of processing an actual population of candidate solutions, makes use of a statistical representation of the population which evolves over time. In addition, the framework uses a stochastic local search algorithm which attempts to enhance the performance of th…
Causal and Non-Causal Frequency Domain Assessment of Spontaneous Baroreflex Sensitivity after Myocardial Infarction
2020
Acute myocardial infarction (AMI) is thought to alter the baroreflex control of arterial pressure. We tested this hypothesis investigating the changes of the cardiovascular response after AMI in comparison with young and old healthy controls studied at rest and during head-up tilt, using causal and non-causal frequency domain measures of the baroreflex sensitivity. Our results indicate: (i) the importance of using a causal approach that takes into account not only feedback but also feedforward effects in the study of interactions between the heart period and the arterial pressure; (ii) the compromised capacity of baroreceptors to control SAP fluctuations in post-AMI patients, both at rest a…
Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment
2020
An array of 16 laser-pumped scalar Cs magnetometers was part of the neutron electric dipole moment (nEDM) experiment taking data at the Paul Scherrer Institute in 2015 and 2016. It was deployed to measure the gradients of the experiment's magnetic field and to monitor their temporal evolution. The originality of the array lies in its compact design, in which a single near-infrared diode laser drives all magnetometers that are located in a high-vacuum chamber, with a selection of the sensors mounted on a high-voltage electrode. We describe details of the Cs sensors' construction and modes of operation, emphasizing the accuracy and sensitivity of the magnetic-field readout. We present two app…