Search results for " Network"
showing 10 items of 6428 documents
Smart Wireless Sensor Networks and Biometric Authentication for Real Time Traffic Light Junctions Management
2013
The main challenge of intelligent transportation systems (ITS) is to deal with ‘real-time’ information to improve vehicular traffic management. Road data can be processed and used for dynamic traffic light management in order to reduce waiting times in queues. This paper proposes an innovative distributed architecture based on a wireless sensor network (WSN) with a network coordinator providing remote and ubiquitous authentication module for managing unexpected events. The architecture is completed by a dynamic module for street priority management depending on traffic rate. Many experimental trials have been carried out considering three different levels of traffic intensity to prove the e…
The forecasting of the roadside pollutant levels to evaluate traffic management measures in Palermo.
2015
The road transport has become the major source of environmental degradation in urban centres. It produces negative externalities (i.e. pollution, delay, etc.) that are usually connected with the queues of traffic flows and the congestion of the road network. The quantitative estimation of roadside pollutant levels is very complex. Many variables are involved such as the type of vehicle (characterized by different antipollution devices, used fuels, engine temperatures, maintenance level of engines, etc.), the different cinematic conditions of the flows, the urban/road network structure, the weather conditions, etc. Therefore it is important to develop scientific tools able to predict roadsid…
On the effects of transmit power control on the energy consumption of WiFi network cards
2009
Transmit power control has been largely proposed as a solution to improve the performance of packet radio systems in terms of increased throughput, spatial reuse and battery lifetime for mobile terminals. However, the benefits of transmit power control schemes on these different performance figures may strongly depend on the employed PHY technology and channel access mechanism. In this paper, we focus on the effects of power control on the energy consumption of WiFi network cards. By means of several experimental tests carried out under different operation conditions and modulation schemes, we try to justify why the reduction of the transmission power has a marginal effect on the overall en…
Dealing with viewers’ complaints: Role, visibility and transparency of PSB Ombudsmen in ten European countries
2017
The article shows the results of a comparative analysis of the complaints management mechanisms offered by ten European Public Service Broadcasting (PSB) systems on their corporate websites. Using a qualitative methodology, it maps the procedures and evaluates the visibility, transparency and dissemination of results. The findings show, firstly, great diversity in terms of responsible election and management, despite the converging media governance. Also noteworthy is the margin of substantial improvement in the transparency and dissemination possibilities, specially relating to the interaction offered by the digital environment. Among the ten public corporations analysed, the BBC is the be…
A two-phase insertion technique of unexpected customers for a dynamic dial-a-ride problem
2006
Abstract This work deals with a dynamic dial-a-ride problem with time window constraints. In particular, new unplanned requests for service may arise at a vehicle stop and the driver must decide in real-time whether to accept or reject them. For this problem, we have developed a two-phase insertion algorithm based on route perturbations: the first phase, which is run off-line when the vehicle moves between two successive stops, aims at creating a feasible neighborhood of the current route; while the second phase, which is run in real-time every time a new request occurs, inserts, when possible, the delivery stop of the new customer in the current route.
User Preference and Channels Use in the Employment Seeking Process
Trust is a major issue for social capital theory and the word- of mouth concept. This paper compares social network sites with other media under consideration of trust and support. The research evaluates the difference between sources regarding trust and support to explain the situation of social network sites under consideration of the employment seeking process. The aim of this paper is the evaluation of the use of social network sites and private social networks by comparing these with job boards, company information, newspaper and official employment agency web pages. It is to identify the possible differences between information channels and the reasons for the use of different sources…
An Automatic Method for Assessing Spiking of Tibial Tubercles Associated with Knee Osteoarthritis
2022
Efficient and scalable early diagnostic methods for knee osteoarthritis are desired due to the disease’s prevalence. The current automatic methods for detecting osteoarthritis using plain radiographs struggle to identify the subjects with early-stage disease. Tibial spiking has been hypothesized as a feature of early knee osteoarthritis. Previous research has demonstrated an association between knee osteoarthritis and tibial spiking, but the connection to the early-stage disease has not been investigated. We study tibial spiking as a feature of early knee osteoarthritis. Additionally, we develop a deep learning based model for detecting tibial spiking from plain radiographs. We collected an…
Turismo relazionale in tre sistemi territoriali
2007
L'azione di ricerca ha lo scopo di verificare la presenza, nei tre contesti di studio (Val d’Anapo, Valle dell’Halaesa, S. Vito) di un’ offerta turistica che dispone di un sistema di relazioni formali ed informali al fine di ottenere un'idonea “mappatura” dei tre territori per determinare, con rigore scientifico, il fabbisogno turistico in chiave relazionale. Un secondo aspetto riguarda la verifica della dimensione relazionale con riferimento alla domanda turistica effettiva e potenziale delle località. Si vuol stabilire quali e quanti sono le relazioni presenti tra domanda turistica e sistema dell’offerta, sia attuali che potenziali ed in che termini questi contatti siano in grado di influ…
I risultati dell'analisi del turismo relazionale
2007
Sulla base delle risultanze emerse dalla ricerca, verrà effettuata una breve analisi dei tratti peculiari della relazionalità nelle aree indagate, mettendo in relazione gli aspetti che l’hanno determinata, utilizzando il modello multidimensionale. Lo scopo è di evidenziare le potenzialità presenti, le variabili che necessitano di interventi mirati e puntuali e le possibili proposte strategiche per favorire l’implementazione di un piano di sviluppo locale con declinazione turistico-relazionale.