Search results for "control"

Kinematic and Elastostatic Design Optimisation of the 3-DOF Gantry-Tau Parallel Kinematic Manipulator

2009

Published version of an article in the journal: Modeling Identification and Control. Also available from the publisher:http://dx.doi.org/10.4173/mic.2009.2.1 One of the main advantages of the Gantry-Tau machine is a large accessible workspace/footprint ratio compared to many other parallel machines. The Gantry-Tau improves this ration further by allowing a change of assembly mode without internal link collisions or collisions between the links and end-effector. The reconfigurable Gantry-Tau kinematic design obtained by multi-objective optimisation according to this paper gives the following features: 3-D workspace/footprint ration is more than 3.19, lowest Cartesian stiffness in the workspa…

Agreement and disagreement between expectations and realizations

1990

The objective of the paper is to measure the intensity of the relation between expectations and realizations for strategic variables of firms, such as production, demand or prices. An anticipation error reveals a disagreement which can be associated with the rational expectations hypothesis. The agreement coefficient between classifications, given by COHEN (1968) and LIGHT (1971) and calculated from a probability matrix, is used to define a direct measure of the disagreement between classifications. Comparison of the coefficients is used to test the rational expectations hypothesis.The coefficients are applied to business survey data of INSEE for France between 1974 and 1986.

Recursive estimators 1

1991

In this paper, we present first the recursive estimation of parameters of linear regression models and we show the link between a matrix of projection and a matrix of gain. Two cases are examined : constant parameters and parameters changing over time. In the second part the recursion formulae for the two stage least squares are given.

Des capacités de choix aux probabilités de choix (un théorème de conversion)

1992

Une partie importante de la théorie des choix discrets concerne les développements du modèle de Luce 1959]. Cette place privilégiée provient sans nul doute de l’extrême élégance de PAxiome du Choix qui permet d’une part, d’introduire une sorte de rationalité imparfaite du comportement en autorisant la construction de probabilités de choix et d’autre part, de décrire un processus de choix qui semble raisonnablement réaliste : en effet, il est suggéré que l’agent faisant face à un ensemble fini d’actions, choisit dans un premier temps un sous-ensemble, puis finalement, à l ’intérieur de ce sous-ensemble, une action. Il existe de nombreuses versions de ce modèle ( Yellot [1977], Strauss [1980]…

La combinaison de prévisions multiples en présence d'objectifs multiples

1989

L'idée de combiner plusieurs prédicteurs pour générer des prévisions combinées plus fiables semble ne dater que de 1969, date de la publication de l'article de Bâtes et Granger (1969). Depuis lors on a constaté un foisonnement de publications tant théoriques qu'empiriques dans ce domaine et l'utilité pratique de la combinaison de prévisions individuelles y a été amplement démontrée.

Procesos de autonomia normativa entre perfiles de indipendencia e interdependencia funcional

2010

The author says that to get rules technique and the certainty of the law together is quite a postulate. The certainty of rules is the expression of impartiality and guarantee which should be assured by the "fixity" of the law.Neverthless one can point out the insufficinet reconnaissance of the rules seen as pure written record, that is the "liturgic text" to individuate the real content of the law. The author gives variegated exemplifications about it. Viceversa the rule exists because it is "alive", and in it is its effective vitality. So it exists in the semantics and in the jurisdictional control and in its applicability. After all, the matter of law is a matter of fact. The specific fac…

Stability of stochastic nonlinear systems with state-dependent switching

2013

In this paper, the problem of stability on stochastic systems with state-dependent switching is investigated. To analyze properties of the switched system by means of Itô’s formula and Dynkin’s formula, it is critical to show switching instants being stopping times. When the given active-region set can be replaced by its interior, the local solution of the switched system is constructed by defining a series of stopping times as switching instants, and the criteria on global existence and stability of solution are presented by Lyapunov approach. For the case where the active-region set can not be replaced by its interior, the switched systems do not necessarily have solutions, thereby quasi-…

Vankien elämänhallinta

1998

La relazione tra controllo di gestione e strategia per il successo aziendale

2020

Il presente capitolo ripercorre in chiave critica lo sviluppo degli studi sui sistemi di controllo di gestione, con specifico riferimento a come è evoluta nel tempo la relazione tra tali sistemi e la strategia aziendale. L’obiettivo è quello di evidenziare come studi recenti su controllo e strategia, legati al filone teorico practice-based, possano offrire spunti interessanti nel riconfigurare tale relazione a supporto del successo aziendale.

Pre-sleep arousal and sleep quality during the COVID-19 lockdown in Italy

2021

Abstract Objective The COVID-19 pandemic has strongly affected daily habits and psychological wellbeing, and many studies point to large modifications in several sleep and sleep-related domains. Nevertheless, pre-sleep arousal during the pandemic has been substantially overlooked. Since hyperarousal represents one of the main factors for the development and the perpetuation of chronic insomnia disorder, the assessment of variables associated with high levels of pre-sleep arousal during the pandemic is clinically relevant. The study aimed to assess the prevalence and predictors of perceived sleep quality and pre-sleep arousal in an Italian sample during the COVID-19 lockdown. Methods We used…