Utilizzo di fibre ad elevato coefficiente nonlineare in strutture interferometriche di tipo NOLM.

Progetto e realizzazione di strutture interferometriche di tipo NOLM per l'elaborazione ottica dei segnali mediante fibre altamente nonlineari

Coherent 100G Nonlinear Compensation with Single-Step Digital Backpropagation

Enhanced-SSFM digital backpropagation (DBP) is experimentally demonstrated and compared to conventional DBP. A 112 Gb/s PM-QPSK signal is transmitted over a 3200 km dispersion-unmanaged link. The intradyne coherent receiver includes single-step digital backpropagation based on the enhanced-SSFM algorithm. In comparison, conventional DBP requires twenty steps to achieve the same performance. An analysis of the computational complexity and structure of the two algorithms reveals that the overall complexity and power consumption of DBP are reduced by a factor of 16 with respect to a conventional implementation, while the computation time is reduced by a factor of 20. As a result, the proposed algorithm enables a practical and effective implementation of DBP in real-time optical receivers, with only a moderate increase of the computational complexity, power consumption, and latency with respect to a simple feed-forward equalizer for dispersion compensation.Comment: This work has been presented at Optical Networks Design & Modeling (ONDM) 2015, Pisa, Italy, May 11-14, 201

Genetic evaluation for goat breeds Saanen and Alpine Camosciata: Total Merit Index

The difficulty to select breeding animals on the base of 5 separate indices (yield of milk, fat and protein and corresponding percentages) made it necessary to simplify the process by combining sep..

Use of a partial least squares regression model to predict Test Day of milk, fat and protein yields in dairy goats

A model able to predict missing test day data for milk, fat and protein yields on the basis of few recorded tests was proposed, based on the partial least squares (PLS) regression technique, a multivariate method that is able to solve problems related to high collinearity among predictors. A data set of 1731 lactations of Sarda breed dairy Goats was split into two data sets, one for model estimation and the other for the evaluation of PLS prediction capability. Eight scenarios of simplified recording schemes for fat and protein yields were simulated. Correlations among predicted and observed test day yields were quite high (from 050 to 088 and from 053 to 096 for fat and protein yields, respectively, in the different scenarios). Results highlight great flexibility and accuracy of this multivariate technique

Optimizing interpolation of shoot density data from a Posidonia oceanica seagrass bed

A case study on the optimization of Posidonia oceanica density interpolation, using a data set from a large meadow at Porto Conte Bay (NW Sardinia, Italy), is presented. Ordinary point kriging, cokriging and a weighted average based on inverse square distance were used to interpolate density data measured in 36 sampling stations. The results obtained from different methods were then compared by means of a leave-one-out cross-validation procedure. The scale at which interpolation was carried out was defined on the basis of the Hausdorff dimension of the variogram. Optimizing spatial scale and data points search strategy allowed obtaining more accurate density estimates independently of the interpolation method

DEGLUTIZIONE FISIOLOGICA, DEGLUTIZIONE DISFUNZIONALE; SIGNIFICATO NEUROFISIOLOGICO DELLA DEGLUTIZIONE E SUA INTERFERENZA SULLA POSTURA.

La Deglutizione è un complesso meccanismo neuromuscolare tanto da essere il movimento più complesso compiuto dall’uomo, che inizia dalla 13° settimana di vita intrauterina e evolve nei primi anni di vita, modificando il proprio assetto da una forma infantile ad una forma adulta e matura. La deglutizione si riverbera sulla postura del soggetto dalla testa fino ai piedi. Quando questo naturale processo di trasformazione viene in qualche modo alterato, ci troviamo di fronte ad un quadro di deglutizione disfunzionale o patologica Nella sua espressione patologica da origine ad un quadro clinico caratterizzato da alterazioni a carico di svariati organi e apparati. In particolare la sua espressione sulla postura del soggetto da origine ad un grado clinico ormai standardizzato noto con il nome di Sindrome Glossoptosica 1997 Dott. Antonio Ferrante fonda, dopo aver compiuto innumerevoli studi e pubblicazioni intorno all’importanza della deglutizione, il primo Centro di Terapia Miofunzionale La Terapia Miofunzionale non è più soltanto un aiuto per l’Odontoiatra e per l’ Otorinolaringoiatra , ma diviene il cardine per il riequilibrio posturale globale e per l’approccio ad alcune problematiche generali tra le quali anche quelle ormonali. La Terapia Miofunzionale è il trattamento d’elezione della deglutizione disfunzionale e attraverso questo si può arrivare a portare notevoli miglioramenti sul piano posturale. Il termine fu coniato agli inizi del secolo scorso da A. Lischer che la definì come "l'intervento terapeutico sulla muscolatura oro-facciale effettuato con esercizi di ginnastica muscolare", Solo da qualche anno, la Terapia Miofunzionale, può essere utilizzata come parte di un percorso riabilitativo multiprofessionale che vede interagire il medico fisiatra esperto in posturologia, il fisioterapista, l’ortottista, l’odontoiatra ed il logopedista in quelle situazioni di squilibrio posturale infantili, adolescenziali o adulte, dovute in parte o completamente ad una deglutizione deviata. Questo lavoro vuole sottolineare l'appropriatezza di tale approccio terapeutico

Optical Time-Frequency Packing: Principles, Design, Implementation, and Experimental Demonstration

Time-frequency packing (TFP) transmission provides the highest achievable spectral efficiency with a constrained symbol alphabet and detector complexity. In this work, the application of the TFP technique to fiber-optic systems is investigated and experimentally demonstrated. The main theoretical aspects, design guidelines, and implementation issues are discussed, focusing on those aspects which are peculiar to TFP systems. In particular, adaptive compensation of propagation impairments, matched filtering, and maximum a posteriori probability detection are obtained by a combination of a butterfly equalizer and four 8-state parallel Bahl-Cocke-Jelinek-Raviv (BCJR) detectors. A novel algorithm that ensures adaptive equalization, channel estimation, and a proper distribution of tasks between the equalizer and BCJR detectors is proposed. A set of irregular low-density parity-check codes with different rates is designed to operate at low error rates and approach the spectral efficiency limit achievable by TFP at different signal-to-noise ratios. An experimental demonstration of the designed system is finally provided with five dual-polarization QPSK-modulated optical carriers, densely packed in a 100 GHz bandwidth, employing a recirculating loop to test the performance of the system at different transmission distances.Comment: This paper has been accepted for publication in the IEEE/OSA Journal of Lightwave Technolog

THREATS ON REAL, EMULATED AND VIRTUALIZED INTEL X86 MACHINE CODE EXECUTION

Cybercriminals have all the interest in not being detected while perpetrating their intentions. Impeding such threats to spread has become of valuable importance. This goal can be achieved working on the threat vectors cybercriminals use or directly on the threat once identified. Among threat vectors we can cite application software vulnerabilities which can be abused by malware and malicious users to gain access to systems and confidential data. To be able to impede exploitation of such vulnerabilities, security specialists need to be aware of attack techniques used by malware and malicious users for to be able to design and implement effective protection techniques. For identifying threats, it is of vital importance to use effective analysis tools which expose no weaknesses to malware authors giving them the chance to evade detection. This dissertation presents two approaches for testing CPU emulators and system virtual machines which represent a fundamental component of dynamic malware analysis. These testing methodologies can be used to identify behavioural differences between real and emulated hardware. Differences exploitable by malware authors to detect emulation and hide their malicious behaviour. This dissertation also presents a new exploitation technique against memory error vulnerabilities able to circumvent widely adopted protection strategies like W^X and ASLR and the related countermeasure to impede exploitation