1,721,530 research outputs found
Urban transport planning and energy resources: Electric vehicle routing with reliable link travel times
Full text linkThe rise of new types of vehicles, as the electrical vehicles (EVs), requires defining new models for transport simulation and design, both for freight and for passengers. This paper focuses on freight transport on the land side and it is in the area of the smart city where transport, energy and information and communications technology sectors are considered. This paper focuses on the transport sector and, in particular, the formulation of a vehicle routing problem is considered. The adopted approach considers three aspects: reliable travel time, path generation and best route design for electric vehicles. A possible formulation for a vehicle routing problem with time windows is reported, considering a specific constraint for electric vehicles. The main results obtained in some case studies are reported
Optimising Waiting at Nodes in Time-Dependent Networks: Cost Functions and Applications
No full textIn this paper, the relationship between waiting at nodes and the path cost in a transport network is analysed. An exact solution algorithm for generating the shortest path with optimal waiting at the nodes is proposed. The general case is examined, considering a time-dependent network (time influences the cost). To develop a full application, the algorithm is applied in the case of a vehicle routing problem on a real network. © 2012 Springer Science+Business Media, LLC
A model to simulate multimodality in a mesoscopic dynamic network loading framework
Full text linkA dynamic network loading (DNL) model using a mesoscopic approach is proposed to simulate a multimodal transport network considering en-route change of the transport modes. The classic mesoscopic approach, where packets of users belonging to the same mode move following a path, is modified to take into account multiple modes interacting with each other, simultaneously and on the same multimodal network. In particular, to simulate modal change, functional aspects of multimodal arcs have been developed; those arcs are properly located on the network where modal change occurs and users are packed (or unpacked) in a new modal resource that moves up to destination or to another multimodal arc. A test on a simple network reproducing a real situation is performed in order to show model peculiarities; some indicators, used to describe performances of the considered transport system, are shown
Manuale Oxford di Odontoiatria Clinica
No full textIl Manuale Oxford di Odontoiatria Clinica offre un compendio ragionato delle conoscenze in campo odontoiatrico. L’impostazione del libro mette in risalto l’applicazione delle nozioni teoriche nella realtà clinica, con l’obiettivo di fornire risposte ai problemi più comuni che si incontrano nella pratica professionale quotidiana.
Conciso e focalizzato sulla pratica, il manuale fornisce indicazioni cliniche, linee guida aggiornate e numerosi protocolli. La comprensione e la lettura è facilitata anche da immagini e diagrammi. Un testo di base completo che include anche argomenti che si evolvono rapidamente come la terapia farmacologica e l’anestesia, nonché aggiornamenti legati a recenti ricerche scientifiche sull’eziologia e sulla gestione del carcinoma orale.
Le numerose immagini a colori e i diagrammi presenti aiutano maggiormente la comprensione di tutti i passaggi di un intervento terapeutico
Urban freight transport and logistics: retailer’s choices
No full textThis paper presents a modelling system developed for the analysis of retailer’s choices in metropolitan areas. The proposed modelling system aims at analysing the aspects for freight shipments within urban or metropolitan areas. The models were developed using the results of some surveys carried out in different contexts characterised by a population between 180,000 and 800,000 inhabitants
Impact Mitigation of Tunnels Maintenance Works on Highway Performance
Full text linkMajor maintenance interventions on highways (e.g., for the safety improvement of tunnels and viaducts) involve the presence of work zones for extended periods of time and along wide sections of the infrastructure. These interventions lead to supply changes, especially a reduction in capacity, causing a decrease in the performance of the transportation system, which users experience with increased traffic congestion and economic losses in terms of productivity. This paper aims to demonstrate that proper traffic management and work zone planning allow for a significant reduction of such impacts. In relation to traffic management, possible solutions consist of diverting traffic flows onto alternative routes (if possible, using primary roads) or keeping them in the remaining lanes along the work zone. In terms of work zone planning, leverage can be applied, on the one hand, through the design of the work zone layout and maintenance scheme and, on the other, through the duration and scheduling of the interventions. The methodology proposed in this paper is based on traffic simulation models in order to assess different maintenance scenarios under varying demand levels (i.e., during the rush hour and off-peak hours, weekdays and weekends, summer and winter months) and vehicular compositions (i.e., percentage of heavy vehicles), with the goal of identifying the scenario that minimizes the impacts on users. Modelling evidence on a real case study of tunnel maintenance interventions on an Italian highway is reported, discussing the policy implications on the basis of quantitative indicators, such as level of service, duration of delays, length of queues, and economic impacts
Systems Orthodontics From Clinical Reasoning to Computation, and Back
No full textThis book marks one of the first applications of the Medicine Network discipline to an everyday scenario. It explores situations where patients, often in adolescence, grapple with the decision of whether to commence a treatment, seeking insights into the more plausible future scenarios. Additionally, the specific feedback from biological systems in the human body serves as a potent metaphor for addressing various challenges in the field of Complex Systems
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