oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Search Results: 1 - 10 of 6062 matches for " Stefano Busanelli "
All listed articles are free for downloading (OA Articles)
Page 1 /6062
Display every page Item
I2V Highway and Urban Vehicular Networks: A Comparative Analysis of the Impact of Mobility on Broadcast Data Dissemination
Stefano Busanelli,Gianluigi Ferrari,Vito Andrea Giorgio
Journal of Communications , 2011, DOI: 10.4304/jcm.6.1.87-100
Abstract: In this paper, we consider the problem of disseminating data in Infrastructure-to-Vehicular (I2V) IEEE 802.11 networks. We analyze, with acomparative approach, the performance in highway and urban scenarios.In particular, after characterizing the mobility in these scenarios we analyze the performance in terms of data dissemination from a fixed Road Side Unit (RSU) to the vehicles passing in its proximity through a recently proposed multihop probabilistic broadcasting protocol, namely Irresponsible Forwarding (IF). In the case of highway-like Vehicular Ad-Hoc NETworks (VANETs), we first characterize a mobile scenario in such a way to make a direct comparison with a static scenario meaningful, taking into account a physical characterization of the network (e.g., in termsof vehicle spatial density). Then, we consider a few mobile urban scenarios, characterized by the presence of junctions regulated byTraffic Lights (TLs) and Roundabouts (Rs). Our results show that, from a single packet perspective, the vehicles' mobility does not affect the behavior of the IF protocol, at least in the considered mobile scenarios (both highway and urban). However, different conclusions are reached when an information flow (i.e., a series of consecutive packets) is considered. In this context, we determine the maximum amount of data which can be transferred from the RSU to the mobile vehicles passing through a certain Region Of Interest (ROI) around the RSU.
Cross-Network Information Dissemination in Vehicular Ad hoc Networks (VANETs): Experimental Results from a Smartphone-Based Testbed
Stefano Busanelli,Filippo Rebecchi,Marco Picone,Nicola Iotti,Gianluigi Ferrari
Future Internet , 2013, DOI: 10.3390/fi5030398
Abstract: In this work, we present an innovative approach for effective cross-network information dissemination, with applications to vehicular ad hoc networks (VANETs). The proposed approach, denoted as "Cross-Network Effective Traffic Alert Dissemination" (X-NETAD), leverages on the spontaneous formation of local WiFi (IEEE 802.11b) VANETs, with direct connections between neighboring vehicles, in order to disseminate, very quickly and inexpensively, traffic alerts received from the cellular network. The proposed communication architecture has been implemented on Android smartphones. The obtained experimental results show that an effective cross-network information dissemination service can entirely rely on smartphone-based communications. This paves the way to future Internet architectures, where vehicles will play a key role as information destinations and sources.
Estratégias de Orienta o e Estudos de Campo em Contabilidade
André Carlos Busanelli de Aquino
Contabilidade Vista & Revista , 2009,
Abstract: O artigo discute a aderência da estratégia de orienta o aos desafios do desenho e condu ode estudos de campo. Tal aderência pode potencializar a qualidade desse tipo de pesquisano teste e desenvolvimento de teorias em contabilidade gerencial e financeira. Para tanto,foram identificadas as estratégias de orienta o relatadas na literatura de educa o superior,e analisadas segundo as particularidades da condu o de estudos de campo. Em seguida, aanálise tratou do papel do orientador em uma gama de táticas aplicadas em estudos decampo, destacando a contribui o destas táticas na redu o das amea as às condi es deconfiabilidade e validade. Devido à natureza das tarefas a serem realizadas pelo aluno(menos antecipáveis e padronizadas ex ante), estudos de campo demandam umaparticipa o mais intensa do orientador. Isto se dá tanto na capacita o do aluno nas fasesde desenho da pesquisa e do protocolo, quanto em seu apoio nas defini es ex post à entradaem campo, por exemplo, ajudando a resolver as lacunas e inconsistências identificadas nasinforma es trianguladas por meio de entrevista, arquivos da empresa, questionário eobserva o pessoal.
Folga or amentária em uma Secretaria da Fazenda: um caso no nível do governo estadual no Brasil Holgura presupuestaria en el Departamento del Tesoro: un caso al nivel del gobierno estatal en Brasil Budgetary slack in a Treasury Department: a case in the state government level in Brazil
Alyne Anteveli Osajima,André Carlos Busanelli de Aquino
Revista de Administra??o Pública , 2013,
Abstract: Organiza es públicas vêm adotando modelos de mensura o de desempenho (MMD), a exemplo da iniciativa privada, buscando gerar incentivos à eficiência de equipes de servidores. A partir da literatura de folga or amentária, este trabalho analisou o MMD de uma das Secretarias de Fazenda no nível estadual no Brasil e identificou que, a partir das metas pactuadas pela equipe diretiva da secretaria, a organiza o opera em um regime de folga or amentária, em um ambiente organizacional de menor tens o em rela o ao atingimento das metas e consequente gratifica o. Através de séries históricas (jan./2007 a jun./2009) do desempenho individual mensal de 950 servidores públicos que atuam como fiscais, foram comparados o nível de atingimento das metas tributárias e administrativas. Adicionalmente, tais evidências foram trianguladas com observa es participativas e análises documentais. Apesar da folga or amentária detectada na utiliza o de metas com alta probabilidade de atingimento, o desempenho nas tarefas administrativas duplicou no último ano analisado, evidência de que o nível de esfor o individual cresceu, apesar do incentivo pecuniário ser garantido em um nível menor de esfor o. Las organizaciones públicas han ido adoptando sistemas de medición del desempe o (PMM, por sus siglas en inglés) a partir de los ejemplos de la iniciativa privada, buscando crear incentivos a la eficiencia de los equipos de funcionarios de carrera. Tomando como base los escritos sobre holgura presupuestaria, esta investigación ha analizado los PMM de un Departamento del Tesoro a nivel del gobierno estatal en Brasil y ha determinado que, teniendo en cuenta el objetivo acordado por el equipo directivo del Tesoro, la organización opera en un régimen de holgura presupuestaria en un ambiente organizacional de menor presión en relación con la consecución de metas y sus consiguientes recompensas. A través de series históricas del rendimiento individual mensual de 950 funcionarios en su labor como fiscales, entre enero de 2007 y junio de 2009, se comparó el nivel de consecución de sus metas tributarias y administrativas. Además, se triangularon tales evidencias con las observaciones participativas y el análisis documental. A pesar de la holgura presupuestaria detectada en el uso de objetivos con una elevada probabilidad de éxito, el rendimiento en las tareas administrativas se duplicó en el último a o analizado, lo cual evidencia que el nivel de esfuerzo individual aumentó a pesar del hecho de que el incentivo pecuniario está garantizado a un nivel de esfuerzo menor. Public organizations have
Feasibility Evaluation of Integrating UsabilityEngineering Issues in a Design for Multi-XCollaborative Framework  [PDF]
Stefano Filippi
Intelligent Information Management (IIM) , 2011, DOI: 10.4236/iim.2011.31004
Abstract: Design for manufacturing, design for assembly, and, in general, design for X, are methods helping an effective generation of industrial products. In parallel with the development of these methods, the research about usability engineering has generated many important results, both from the design, and the evaluation and testing points of view. The research described in this paper aims at evaluating the feasibility of the integration of two new usability methods, the design for innovative usability - DFIU -, and the integrated method for usability evaluation and testing - IMUET -, in an existing design for X named design guidelines collaborative framework - DGLs-CF -. Indeed, the DGLs-CF is a design for multi-X method, given that it covers both the manufacturing and the verification phases of the industrial product lifecycle. All these methods are currently under development by the author’s research group. To evaluate this feasibility, the first task of the research aims at describing and classifying the components of the three methods. Next, these components are semantically related to each other. Finally, the last activity verifies the compatibility between the components of the two usability methods and the data structures of the DGLs-CF to check the feasibility from the implementation point of view. The result of this research will consist of precise indications both for the development of a design for multi-X collaborative framework covering homogeneously the design, manufacturing, verification, and use phases of the industrial product lifecycle, and to be used as a reference for researchers interested in considering the integration of usability issues in their design tools, methods, and processes.
A General Purpose Analysis Package  [PDF]
Stefano Federico
Atmospheric and Climate Sciences (ACS) , 2012, DOI: 10.4236/acs.2012.22022
Abstract: This paper presents a general-purpose analysis package able to solve two- and three- dimensional analysis problems. The system can use the following methods of solution: Successive Approximation (SA), Optimal Interpolation (OI), and 3D-Var. Analyses are given for the following parameters: zonal and meridional wind components, temperature, relative humidity, and geopotential height. The analysis package was applied to produce analyses at 6 h time interval for the period 1-11 August 2008. The period was selected for data availability and forty-one analyses were collected. The results show the validity of the different solutions, which can be chosen depending on the physical problem to solve and on the computational resources available. In particular, assuming the observations as the reference, all solutions show a decrease of the RMSE compared to the background. The decrease is consistent with the particular setting of the analysis system used in this paper. The comparison between different solutions shows that the SA converges to OI in few iterations, and that the SA solution with ten iteration is, in practice, equal to OI. Moreover, the 3D-Var method shows its potential to improve the analysis, once the horizontal and vertical length-scales and the background and observational errors are set optimally, because its solution may be sizeably different from two-dimensional methods.
Preliminary Results of a Data Assimilation System  [PDF]
Stefano Federico
Atmospheric and Climate Sciences (ACS) , 2013, DOI: 10.4236/acs.2013.31009
Abstract:

A data assimilation system combines all available information on the atmospheric state in a given time-window to produce an estimate of atmospheric conditions valid at a prescribed analysis time. Nowadays, increased computing power coupled with greater access to real-time asynoptic data is paving the way toward a new generation of high-resolution (i.e. on the order of 10 km) operational mesoscale analyses and forecasting systems. Moreover, better initial conditions are increasingly considered of the utmost importance for Numerical Weather Prediction (NWP) at the short range (0 - 12 h). This paper presents a general-purpose data assimilation system, which is coupled with the Regional Atmospheric Modelling System (RAMS) to give the analyses for: zonal and meridional wind components, temperature, relative humidity, and geopotential height. In order to show its potential, the data assimilation systems applied to produce analyses over Central Europe. For this application the background field is given by a short-range forecast (12 h) of the RAMS and analyses are produced by 2D-Var with 0.25? horizontal resolution. Results show the validity of the analyses because they are closer to the observations, consistently with the settings of the data assimilation system. To quantify the impact of improved initial conditions on the forecast, the analyses are then used as initial conditions of a short-range (6 h) forecast of the RAMS model. The results show that the RMSE is effectively reduced for the one- and two hours forecast, with some improvement for the three-hours forecast.

Continued Fractions and Dynamics  [PDF]
Stefano Isola
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.57101
Abstract:

Several links between continued fractions and classical and less classical constructions in dynamical systems theory are presented and discussed.


Revealed Cores: Characterizations and Structure  [PDF]
Stefano Vannucci
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.614200
Abstract: Characterizations of the classes of all choice functions that select the cores or the externally stable cores induced by an underlying revealed dominance digraph are provided. Relying on such characterizations, the basic order-theoretic structure of the corresponding sets of revealed cores is also analyzed. In particular, it is shown that the poset of all revealed cores ordered by set inclusion is a median meet semilattice: therefore, any profile of revealed cores may be aggregated by means of the simple majority rule.
Italian Banks’ Paths through the Crisis  [PDF]
Stefano Zedda
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.73026
Abstract: Over the past seven years, the financial system has undergone an unprecedented crisis, which has caused important changes in the structure and business models of banks. This paper explores the main changes in the structure of Italian banks’ assets in 2007-2013, by size and category, as a result of the financial crisis and of regulatory and business models changes. The analysis shows that the effects of the crisis were very different on different categories, and that business models have changed, pushing the different banking categories to business models and balances increasingly similar.
Page 1 /6062
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.