Search results for "work"
showing 10 items of 14511 documents
Bibendum semper vivat !
2012
International audience
On the Influence of Walking People on the Doppler Spectral Characteristics of Indoor Channels
2017
Author´s accepted manuscript © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. When modelling mobile radio channels with moving scatterers, it is generally assumed that the angles of departure (AODs), angles of arrival (AOAs), and the speed of the scatterers are time-invariant. However, this assumption is violated as the AODs and AOAs vary with the positions of t…
Predictive control of networked systems with communication delays
2012
This paper studies the problem of predictive output feedback control for networked control systems with random communication delays. A networked predictive control scheme is employed to compensate for random communication delays, which mainly consists of the control prediction generator and network delay compensator. Furthermore, a new strategy of designing the time-varying predictive controller with mixed random delays for networked systems is proposed. Then the system can be formulated as a Markovian jump system. New techniques are presented to deal with the distributed delay in the discrete-time domain. Based on analysis of closed-loop networked predictive control systems, the designed p…
Self-regulation mechanism of an ecosystem in a non-Gaussian fluctuation regime
1996
We study a dynamical model for an ecological network of many interacting species. We consider a Malthus-Verhulst type of self-regulation mechanism. In the framework of the mean field theory we study the nonlinear relaxation in three different cases: (a) towards the equilibrium state, (b) towards the absorbing barrier, (c) at the critical point. We obtain asymptotic behavior in all different cases for the time average of the process. The dynamical behavior of the system, in the limit of infinitely many interacting species, is investigated in the stability and instability conditions and theoretical results are compared with numerical simulations. \textcopyright{} 1996 The American Physical So…
Quenched and annealed free energies
1984
This paper gives a simple exposition of the Nishimori method to solve certain quenched, random bond spin-glass models. It allows a transparent physical interpretation in terms of annealed systems. As an application a special solution of the Sherrington-Kirkpatrick model with a discrete probability distribution is obtained and shown to agree with the solution for the Gaussian case. This substantiates the claim that the averaged free energy does not depend on the details of the probability distribution Expose simple de la methode de Nishimori pour resoudre certains modeles de verres de spin avec interactions aleatoires. Interpretation transparente en termes de systemes recuits. Presentation d…
How to Improve the Reliability of Chord?
2008
In this paper we focus on Chord P2P protocol and we study the process of unexpected departures of nodes from this system. Each of such departures may effect in losing any information and in classical versions of this protocol the probability of losing some information is proportional to the quantity of information put into this system. This effect can be partially solved by gathering in the protocol multiple copies (replicas) of information. The replication mechanism was proposed by many authors. We present a detailed analysis of one variant of blind replication and show that this solution only partially solves the problem. Next we propose two less obvious modifications of the Chord protoco…
Design and Implementation of a Tool for Analysing Student Products When They Solve Fermi Problems
2017
In this chapter, we present a tool for analysing the work of secondary-level students from two different schools when they solve a type of Fermi problem. The tool is based on the characterisation of the concepts, procedures and language used to construct the models. Our results show that the proposed tool is useful to describe the models and to distinguish different aspects between the models produced by students without any previous modelling experience and those obtained by students who were already acquainted with working on modelling activities.
O zagrożeniu wypaleniem zawodowym nauczycieli wczesnej edukacji
2018
Nauczyciele stanowią jedną z tych grup zawodowych, które poddane są szczególnej kontroli społecznej, co ma związek z charakterem wykonywanej pracy. Odpowiedzialność za kształcenie i wychowanie przyszłych pokoleń, chęć sprostania oczekiwaniom rodziców a także wymaganiom stawianym przez nadzór pedagogiczny stwarza sytuację, w której osoby mniej odporne na stres narażone są ha różne konsekwencje. Od osób wykonujących zawód nauczyciela zawsze wymagano wiele. Poza niezbędnymi kompetencjami merytorycznymi, metodycznymi, psychologicznymi czy społecznymi, oczekiwano mądrości życiowej, odpowiedzialności, autentyczności, zaangażowania, poświęcenia, altruizmu, kreatywności i wielu innych cech sprzyjaj…
Violent Conflicts and the New Mediatization: The Impact of Social Media on the European Parliamentary Agenda Regarding the Syrian War
2018
As key institutions in Western democracies, parliaments have gained importance regarding foreign affairs issues in recent years. Their increasing role as moral tribunes and discussion forums on conflict prevention and resolution have led to the parliamentarization of international affairs. The examination of the parliamentary agenda and the actors who shape it constitutes a fundamental part of agenda-setting studies as applied to the media and political systems. Among these actors, mass media must be highlighted, taking into account the complex process of information gathering for members of Parliament, particularly in cases related to international violent conflicts. Moreover, in the speci…
Regional differences in Italian students' performance: a simulation model
2017
This work presents the first results of a research project seeking to build a simulation model able to reproduce the differences of Italian students’ performance at regional level. A preliminary qualitative cause-and-effect model defines the main variable involved in the inter-generational skill formation processes, as well as their interplay with the job market context and the triggering of motivational forces for new skill acquisition. Such model was designed according to a system dynamics perspective, considered suitable for capturing the interrelatedness of key variables and for providing useful simulation tools to conduct and communicate future scenario analyses. Keywords: regional…