1,720,976 research outputs found
Analysis and design of warning delivery service in intervehicular networks
No full textThis paper focuses on intervehicular networks providing warning delivery service. As soon as a danger is detected, the propagation of a warning message is triggered, with the aim of guaranteeing a safety area around the point in which the danger is located. Multiple broadcast cycles can be generated so that a given lifetime of the safety area is guaranteed. The service is based on multihop ad hoc intervehicular communications with a probabilistic choice of relay nodes. The scenario we consider consists of high-speed streets such as highways in which vehicles exhibit one-dimensional movements along the direction of the road. We propose some analytical models for the study of this service and derive performance indices such as the probability that a vehicle is informed, the average number of duplicate messages received by a vehicle, and the average delay. Moreover, we use the models to discuss system design issues which include the proper setting of the forwarding probability at each vehicle so that a given probability to receive the warning can be guaranteed to all vehicles in the safety area. The analytical results are validated against simulation results. By being very accurate, the models can be instrumental to the performance evaluation and design of broadcasting techniques in intervehicular network
Filosofia della medicina
No full textLa filosofia della medicina oggi è una disciplina filosofica autonoma, non più solo una filosofia della
scienza applicata; ha intersezioni ovvie con la bioetica ma anche con la filosofia della mente (per
l’applicazione alla psichiatria), la filosofia politica, le discipline mediche specifiche, la filosofia
dell’intelligenza artificiale, la comunicazione della salute e gli studi di healthcare assessment. In
questo capitolo intendiamo fornire uno stato dell’arte, senza voler coprire tutto il territorio che ormai
è vastissimo, ma focalizzandoci sui concetti fondamentali di salute e malattia nonché
sull’epistemologia della medicina, segnalando le direzioni di ricerca che ci sembrano più promettenti
A Queueing Network Model of Short-Lived TCP Flows with Mixed Wired and Wireless Access Links
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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