1,721,427 research outputs found
Os dereitos da velhice em tempos de pandemia
Get PDFMúltiples pandemias han azotado a la humanidad a lo largo de la historia, tales como las de viruela, cólera, fiebre amarilla o la gripe A. Sin embargo, recientemente, y de manera inesperada y abrupta, surgió una nueva pandemia, la del Covid-19. En plena expansión del envejecimiento global, la cantidad de personas mayores en riesgo es importante. Asimismo, un porcentaje considerable de ancianos presenta una o más enfermedades crónicas o bien, vive situaciones de fragilidad o dependencia, todo lo cual aumenta los riesgos de morbimortalidad por las dificultades en el acceso a los cuidados necesarios a causa del colapso mundial y local de los sistemas de salud. En este trabajo se analizan las herramientas jurídicas que la "Convención Interamericana sobre la Protección de los Derechos Humanos de las Personas Mayores" pone a disposición para la construcción de respuestas coherentes con el Estado de Derecho, aún en tiempos de excepción.Fil: Dabove, Maria Isolina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Córdoba. Facultad de Derecho y Ciencias Sociales; Argentina. Universidad de Morón; Argentina. Universidad Nacional de Rosario; Argentin
What is the effect of user and CORS height on NRTK performance?
No full textNetwork Real Time Kinematic (NRTK) positioning is nowadays a very common practice in many parts of the world. The benefits of NRTK positioning and the details of network products have been previously discussed in this column (see the contribution by Leila Kislig in the July/August 2011 issue of Inside GNSS), as has the positioning performance as function of the inter-station distances of the network's continuously operating reference stations (CORS) (see the contributions by P. Dabove et alia in the November/December 2011 issue). However, because GNSS measurement errors are modelled by the network software, the quality of the differential corrections sent to the rover depends on the ability of the network to estimate errors (mainly the atmospheric ones) at individual stations, as well as the capability to spatially model the errors. So, what are the CORSs requirements in order to have good NRTK positioning, considering a multi-frequency and multi-constellation receiver, even in areas with extreme changes in altitude? More specifically, can a heterogeneous network in terms of height of CORS sites be used to obtain centimeter-level accuracy for the rover? We carried out some experiments to answer these questions and present the results in this articl
FOSS4G-IT 2020 - 01 Apertura
No full textFOSS4G-IT 2020 - Apertura Convegno
RELATORI:
Paolo Dabove - Chair
Guido Saracco - Rettore Politecnico di Torino
Sebastiano Foti - vice Rettore alla didattica Politecnico di Torino
Andrea Lingua - Presidente SIFET
Alberto Lauria - Ordine degli Ingegneri della Provincia di Torino</p
Quality control of the NRTK positioning with mass-market receivers
No full textThe employment of mass market receivers in a differential mode is not a standard procedure, especially into a network for NRTK positioning. This is because only few mass market receivers are able to yield raw data as output, almost no one accepts differential corrections, and for many applications is sufficient the WAAS augmentation. In actual fact, the improvements that can lead to the establishment of a network of CORSs (Continuous Operating Reference Stations) can be much higher with regard to these receivers, on condition that the raw data (code or carrier phase measurements) are used with special precautions. These receivers are very often used for the purpose of infomobility, but can also be used for precise farming.
In this chapter, attention is focused on the quality control of GNSS positioning in real time. The goal is to show how networks using NRTK (Network Real Time Kinematic) positioning for different inter-station distances may also be useful in a real-time approach. The objective is to show how CORSs networks are useful for mass-market receivers, considering the accuracy required for the purposes described above.
The accuracy of real-time positioning depends mainly on the type of receiver (whether it is single frequency or low-cost) and antenna (whether it is patch, mass-market or geodetic) used, as well as also the size of the network dimension (Dabove et al., 2011). Numerous experiments have been carried out on different types of networks and differential corrections, so we would like to show the results of such tests for the quality control of real-time positioning.
Excellent results are also been obtained with regard to two mass-market receivers and two antennas settled on the roof of a vehicle. The purpose of these experiments was not to determine the direction of the vehicle, but to constrain the ‘network’ and, simultaneously, to filter the outliers. Particular attention has been devoted to the increasing the quality of the positioning of a C/A-code receiver in real time, and to analyzing and investigating the innovative methods tested by the authors that involve the indicators provided by the rover itself, such as the signal to noise ratio (S/N) and the redundancy of the observations.
The experiments were conducted by splitting a single frequency antenna (Garmin) to both the receiver uBlox 6T and the geodetic receiver (Leica 1200), using the VRS correction and the differential correction of the Nearest station (about 20 km far away). With regard to the VRS correction, the correct fixing of the ambiguity phase is more than 60% of the trajectory and there were no false fixes. In such cases, the maximum planimetric error is less than 5 cm. Considering the positioning obtained by using float ambiguity (about 40%) the errors can be tightly controlled within the previously established parameters (S/N and HDOP). In this way, at least 50% of the trajectory has a maximum error of less than 20 cm. Using the Nearest correction, we have obtained a smaller quantity of integer ambiguity fix and, in this case, it is therefore possible to control the quality of the positioning using the HDOP and S/N parameters
Un metodo innovativo per predire ed identificare i falsi fissaggi delle ambiguità di fase GNSS in reti di stazioni permanenti
No full textOne of the most critical points during the GNSS NRTK (Network Real Time Kinematic) positioning is the correct fixing of the phase ambiguity. This work wants to try to focus attention on the quality control of the real-time GNSS positioning, both from the point of view of what the network provides, and from one of the network products is used by the rover receiver. The quality of the positioning is a parameter that must be monitored in real time to avoid an incorrect ambiguity fixing, also called FF (false fixing), occurring; this can be due both to internal problems of the network software and, more often, to the environment (obstructions, multipath and so on) within which where the receiver works. To achieve this control a tool was designed that, starting from the data available in real time from a user connected to an NRTK positioning service, can identify with a certain probability threshold the effective presence, or the possibility, of a false fixing. The FF estimator will be composed of a neural network, trained a priori with some datasets, and will have, as a single output, the probability that the current fixing is a false fixing of the phase ambiguity. Interesting and surprising results with geodetic GNSS receivers were obtained: in fact FFs are not only identified but also predicted correctly in 95% of cases, regardless of differential correction and the size of the network of permanent stations. In this work only parameters available in real time from the user were considered, but in the future the goal will be to consider also some network parameters in order to analyze why there are still unexplained FF
“Aumentarán los sombreros y disminuirán las cabezas”: bandolerismo y destinos del intelectual moderno en la guerra del fin del mundo.
Get PDFFil: Dabove, Juan Pablo. Universidad de Colorado Boulder; Estados Unidos
FOSS4G-IT 2020 - 12 Chiusura
No full textFOSS4G-IT 2020 - Chiusura Convegno
RELATORI:
Paolo Dabove - Chair
Luca Delucchi - Presidente Associazione GFOSS.it
Paolo Cavallini - Chair QGI
Derechos, libertades e igualdad en la vejez: un nuevo desafío de las acciones positivas
No full textFil: Dabove, Maria Isolina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
FOSS4G-IT 2020 - 12 Chiusura
No full textFOSS4G-IT 2020 - Chiusura Convegno
RELATORI:
Paolo Dabove - Chair
Luca Delucchi - Presidente Associazione GFOSS.it
Paolo Cavallini - Chair QGI
The use of smartphone in the 21st century
Get PDFSmartphone devices are nowadays common affordable devices not only for communication purposes but also for determining the user’s position, for sending emails, managing digital agendas and to allow internet access. Starting from last decade, they become interesting instruments also for engineering and biomedical applications, thanks to their high diffusion. In 2018, 66% of individuals in 52 key countries owned a smartphone, with an increment of about 3% in only one year. This fact permitted the rapid development of apps for different goals, starting from precise positioning both in outdoor and indoor scenarios, to the 3D reconstruction of the environment using images up to driving evaluation purposes or healthcare and biomedical engineering applications. This chapter resumes the main research fields where smartphone devices are considered, providing the main references. It also introduces and briefly describes the contributions contained in this book, guiding the reader through the logical structure of the book in order to point out new possible studies and future perspectives in different reserch fields
- …
