Search results for " receiver"
showing 10 items of 41 documents
Increased serum miR-193a-5p during non-alcoholic fatty liver disease progression: Diagnostic and mechanistic relevance
2022
Background & Aims Serum microRNA (miRNA) levels are known to change in non-alcoholic fatty liver disease (NAFLD) and may serve as useful biomarkers. This study aimed to profile miRNAs comprehensively at all NAFLD stages. Methods We profiled 2,083 serum miRNAs in a discovery cohort (183 cases with NAFLD representing the complete NAFLD spectrum and 10 population controls). miRNA libraries generated by HTG EdgeSeq were sequenced by Illumina NextSeq. Selected serum miRNAs were profiled in 372 additional cases with NAFLD and 15 population controls by quantitative reverse transcriptase PCR. Results Levels of 275 miRNAs differed between cases and population controls. Fewer differences were seen wi…
Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks
2012
I beni confiscati come nuovo spazio pubblico
2014
Nel territorio a nord-est di Palermo la criminalità organizzata, in molte occasioni, ha condizionato il potere politico e amministrativo e inciso su valori e abitudini collettive, esercitando unʼinfluenza determinante nellʼespansione periurbana e nella conseguente trasformazione del paesaggio agrario. Alcuni dei principali centri oggetto della ricerca hanno governato il territorio sotto il controllo sistematico della mafia rendendo necessario lʼintervento dello Stato. Esaminare i rapporti tra amministrazioni locali e Cosa nostra in quei luoghi permette di individuare ricorrenze criminali nella gestione dei beni collettivi e di concentrare lʼattenzione sulle proprietà confiscate. In the nort…
Clientelismo e metodo mafioso: network Criminali e pubblica amministrazione in Sicilia
2011
Quale relazione lega clientelismo e mafia? Quali elementi accomunano crimine dei potenti e metodo mafioso? Come si strutturano i sistemi criminali nelle realtà locali? Il saggio presenta una selezione ragionata di studi sulle relazioni tra clientelismo e mafia (par. 1) e sulle reti che si configurano nell’interconnessione tra sistemi criminali e pubblica amministrazione (par. 2). Tali studi permettono di leggere tanto fenomeni storici, come i comitati d’affari che asservivano i poteri pubblici nella Palermo degli anni Cinquanta (par. 3), tanto fenomeni più recenti, come quelli che, dal 1991 in poi, rientrano nella fattispecie dei Comuni e degli enti locali commissariati per infiltrazioni ma…
Probing the radio emission from air showers with polarization measurements
2014
The emission of radio waves from air showers has been attributed to the so-called geomagnetic emission process. At frequencies around 50 MHz this process leads to coherent radiation which can be observed with rather simple setups. The direction of the electric field induced by this emission process depends only on the local magnetic field vector and on the incoming direction of the air shower. We report on measurements of the electric field vector where, in addition to this geomagnetic component, another component has been observed which cannot be described by the geomagnetic emission process. The data provide strong evidence that the other electric field component is polarized radially wit…
Sparse multipath channels: Modelling, analysis, and simulation
2013
A sparse multipath channel is characterized by a small number of randomly distributed scatterers. This study proposes a methodology for the modelling of sparse multipath channels. The new methodology is then used to develop a sparse narrowband multipath channel model by applying the sum-of-cisoids (SOC) principle. The statistical properties of the presented sparse SOC multipath channel model are studied. Analytical expressions are derived for the mean value, variance, autocorrelation function (ACF) and cross-correlation function (CCF) of the complex channel gain, as well as for the probability density function (PDF) of the envelope. Our study shows that mobile radio channels behave in spars…
Validation procedures in radiological diagnostic models. Neural network and logistic regression
1999
The objective of this paper is to compare the performance of two predictive radiological models, logistic regression (LR) and neural network (NN), with five different resampling methods. One hundred and sixty-seven patients with proven calvarial lesions as the only known disease were enrolled. Clinical and CT data were used for LR and NN models. Both models were developed with cross validation, leave-one-out and three different bootstrap algorithms. The final results of each model were compared with error rate and the area under receiver operating characteristic curves (Az). The neural network obtained statistically higher Az than LR with cross validation. The remaining resampling validatio…
Multipoint transmission scheme for HSDPA
2013
Phase-delayed laser diode array allows ultrasonic guided wave mode selection and tuning
2013
Selecting and tuning modes are useful in ultrasonic guided wave non-destructive testing (NDT) since certain modes at various center frequencies are sensitive to specific types of defects. Ideally one should be able to select both the mode and the center frequency of the launched waves. We demonstrated that an affordable laser diode array can selectively launch either the S0 or A0 ultrasonic wave mode at a chosen center frequency into a polymer plate. A fiber-coupled diode array (4 elements) illuminated a 2 mm thick acrylic plate. A predetermined time delay matching the selected mode and frequency was employed between the output of the elements. The generated ultrasound was detected by a 215…
A software receiver adaptive phase lock loop method
2009
The aim of this paper is to introduce a new and relatively simple algorithm which is capable to tune the parameters of the loop filter in a phase lock loop, like the one that can be found in a global navigation satellite system receiver. The parameters are chosen while the system is running, in order to make the bandwidth of the filter adaptive with respect to the signal dynamic and strength. A wider bandwidth is obtained to make the filter more reactive when searching the carrier, while the bandwidth gets narrower when the system is in the tracking state, in order to cut off as much noise as possible. The algorithm is based on the observation of the estimated variance of the phase lock loo…