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Dealing with network changes in cellular fingerprint positioning systems
Chris Marshall, Federico Pittino, Andrea Dalla Torre, Donatella Gubiani, Angelo Montanari, Paolo Gallo, Andrea Viel, 2017, objavljeni znanstveni prispevek na konferenci

Opis: Besides being a fundamental infrastructure for communication, cellular networks are exploited for positioning through signal fingerprinting. Maintaining the fingerprint database consistent and up-to-date is a challenging task in many fingerprint positioning systems, e.g., in those populated by a crowd-sourcing effort. To this end, detecting and tracking the changes in the configurations of cellular networks over time is recognized as a relevant problem. In this paper, we show that to cope with this problem we can successfully exploit information provided by Timing Advance (TA). As a by-product, we prove that TA can improve the fingerprint candidate selection phase, reducing the number of fingerprints to provide as input to positioning algorithms. The effectiveness of the proposed improvements has been tested on a fingerprint positioning system with a large fingerprint dataset collected over a period of 2 years.
Najdeno v: osebi
Ključne besede: fingerprint positioning systems, cellular communication networks, network changes
Objavljeno: 13.06.2018; Ogledov: 2611; Prenosov: 0
.pdf Polno besedilo (4,64 MB)

Map matching with sparse cellular fingerprint observations
Chris Marshall, Federico Pittino, Andrea Dalla Torre, Angelo Montanari, Paolo Gallo, Donatella Gubiani, Andrea Viel, 2018, objavljeni znanstveni prispevek na konferenci

Najdeno v: osebi
Ključne besede: map matching, fingerprint, trajectories
Objavljeno: 09.12.2018; Ogledov: 2350; Prenosov: 0
.pdf Polno besedilo (2,85 MB)

A map-matching algorithm dealing with sparse cellular fingerprint observations
Andrea Viel, Federico Pittino, Angelo Montanari, Chris Marshall, Donatella Gubiani, Paolo Gallo, Andrea Dalla Torre, 2019, izvirni znanstveni članek

Opis: The widespread availability of mobile communication makes mobile devices a resource for the collection of data about mobile infrastructures and user mobility. In these contexts, the problem of reconstructing the most likely trajectory of a device on the road network on the basis of the sequence of observed locations (map-matching problem) turns out to be particularly relevant. Different contributions have demonstrated that the reconstruction of the trajectory of a device with good accuracy is technically feasible even when only a sparse set of GNSS positions is available. In this paper, we face the problem of coping with sparse sequences of cellular fingerprints. Compared to GNSS positions, cellular fingerprints provide coarser spatial information, but they work even when a device is missing GNSS positions or is operating in an energy saving mode. We devise a new map-matching algorithm, that exploits the well-known Hidden Markov Model and Random Forests to successfully deal with noisy and sparse cellular observations. The performance of the proposed solution has been tested over a medium-sized Italian city urban environment by varying both the sampling of the observations and the density of the fingerprint map as well as by including some GPS positions into the sequence of fingerprint observations.
Najdeno v: osebi
Ključne besede: Map-matching algorithm, trajectory, cellular fingerprint, Hidden Markov Model
Objavljeno: 11.06.2019; Ogledov: 2091; Prenosov: 69
.pdf Polno besedilo (3,93 MB)

Metabolic dysregulation in vitamin E and carnitine shuttle energy mechanisms associate with human frailty
James Nazroo, Royston Goodacre, Neil Pendleton, Frederick Wu, Iain White, Bram Vanhoutte, Gindo Tampubolon, Alan Marshall, Krisztina Mekli, Zahra Rattray, Tarani Chandola, Caroline Johnson, Drupad Trivedi, Yun Xu, Nicholas Rattray, 2019, izvirni znanstveni članek

Opis: Global ageing poses a substantial economic burden on health and social care costs. Enabling a greater proportion of older people to stay healthy for longer is key to the future sustainability of health, social and economic policy. Frailty and associated decrease in resilience plays a central role in poor health in later life. In this study, we present a population level assessment of the metabolic phenotype associated with frailty. Analysis of serum from 1191 older individuals (aged between 56 and 84 years old) and subsequent longitudinal validation (on 786 subjects) was carried out using liquid and gas chromatography-mass spectrometry metabolomics and stratified across a frailty index designed to quantitatively summarize vulnerability. Through multivariate regression and network modelling and mROC modeling we identified 12 significant metabolites (including three tocotrienols and six carnitines) that differentiate frail and non-frail phenotypes. Our study provides evidence that the dysregulation of carnitine shuttle and vitamin E pathways play a role in the risk of frailty.
Najdeno v: osebi
Ključne besede: metabolomics, frailty, ageing, LC-MS, serum
Objavljeno: 08.11.2019; Ogledov: 1888; Prenosov: 60
.pdf Polno besedilo (2,35 MB)

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