Search results for "rapt"
showing 10 items of 53 documents
Rateless codes implementation, optimization and application to Free Space Optics links affected by optical turbulence
In this work, I have implemented, optimized and tested the most advanced rateless codes available up to now, i.e., RaptorQ codes. In detail, a multiplatform data transmission software has been appositely developed in order to verify the effectiveness of the above-mentioned codes to decrease packet loss and hence to improve the link quality, under different network and channel conditions. Several simulative and experimental investigations have been carried out to evaluate the performance of the encoding and decoding schemes and the relative recovery capabilities under different test scenarios. In particular, I have applied the software embedding RaptorQ codes to Free Space Optics communicati…
Towards a European raptor specimen bank in support of contaminant research and monitoring for better chemicals management
Holidays? Not for all. Eagles have larger home ranges on holidays as a consequence of human disturbance
2019
Human-wildlife conflicts are the object of raising concern in conservation biology. People living in urban areas are rapidly increasing worldwide and consequently the temporal pattern of occupation of natural areas for recreation is changing as well, resulting in an ever-increasing concentration of people during weekends and holidays. This is particularly evident in affluent societies, where more recreationists visit natural areas on holidays and weekends, causing disturbance to wildlife in the so-called “weekend effect”. Here, we tested the response to disturbance of 30 Bonelli's eagles tracked by high-frequency GPS/GSM telemetry. We analysed daily home-range size, a measure of changing be…
Citizen science project to monitor wildlife: a first census of wintering Booted Eagle Hieraaetus pennatus in Sicily
2022
Citizen science can represent an effective tool for large- scale data collection and can be used to improve scientific knowledge and define species distribution ranges before proper planning of related conservation strategies. A regional census of wintering Booted Eagle Hieraaetus pennatus in Sicily, never achieved before, was organized by GAM (Gruppo Aquila Minore - Booted Eagle Group) on 12 Janu- ary 2020, involving 90 people from several organizations. A total of 112 wintering individuals have been recorded for the whole region, col- lecting related data about their colour morph, habitat preference and altitude. A regional estimate of 180-220 wintering individuals was cal- culated, also …
Breeding abundance of threatened raptors as estimated from occurrence data
2008
A model derived from the negative binomial distribution (NBD) has been proposed to solve the problem of predicting abundance of species from occurrence maps. The viability of NBD was explored for predicting the breeding abundance of five threatened species of raptor: Bonelli's Eagle Hieraaetus fasciatus, Golden Eagle Aquila chrysaetos, Peregrine Falco peregrinus, Lanner Falco biarmicus and Lesser Kestrel Falco naumanni. First, the accuracy of the NBD was tested in a reference area where the species abundance and occurrence were known through intensive field surveys. Next, an estimation of regional abundance derived from NBD was made for each species. These estimates were then compared to th…
Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks
2012
Correlated channel model for terrestrial Free Space Optics: performance analysis of rateless codes
2012
We describe a novel correlated channel model able to predict random temporal fluctuations of optical signal irradiance caused by scintillation. With regards to the same channel, we also report simulation results on the error mitigation performance of Luby-Transform and Raptor codes.
Performance Investigation of Fountaine Codes on a Simulated Terrestrial Free Space Optical Channel
2012
Optical wireless GEO satellite-to-ground downlinks: rateless codes as solution for scintillation fading
2013
Scintillation fading can corrupt a satellite-to-ground optical wireless links with burst errors. Rateless codes, suitable for erasure channel, are able to eliminate or to reduce these communication errors. We analyzed the performances of three different rateless codes in a simulated Geo satellite-to-ground downlink.