The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The extraction of muscle synergies in human locomotion may be biased by the kind of pre-processing applied to electromyographic (EMG) data. The aim of this contribution is to analyze the differences in the muscle synergies extracted using a standard pre-processing procedure and a new procedure. The new procedure is based on the selection of the muscle's principal activations (necessary actuations...
Among other applications, electromyography (EMG) is used in the assessment of locomotion pathologies to quantitatively document abnormal muscle activation patterns during walking. However, EMG cyclic patterns are affected by high cycle-to-cycle variability. Previous research introduced a clustering approach (CIMAP) to recognize gait cycles with similar EMG onset/offset timings, reducing variability...
Current research in radiology field is increasingly focusing on developing computer aided detection (CAD) systems able to support radiologists in the detection of suspicious regions, reducing oversight, errors and working time. Prostate cancer (PCa) is the most common cancer afflicting men in USA. Multiparametric Magnetic Resonance (mp-MR) imaging is recently emerging as a powerful tool for PCa diagnosis...
The variational theory is well suited for calculating the nuclear mass formula for a given nucleon-nucleon potential. An independent check of the available variational calculations on light nuclei is then possible; however, accurate estimates of the symmetry-energy energy contributions are required.
The present status of the variational approach to finite nuclei, based on correlated wave functions is briefly sketched. A general outline of the problem, and some of the results recently obtained for ligth nuclei are discussed. The variational technique is applied to calculate the relevant coefficients of the nuclear mass formula and estimates of the ground state energies of 16O and 40Ca are also...
An extensive analysis of strongly-interacting infinite Fermi systems is presented within the framework of the variational theory based on trial correlated wave functions. The Fermi hypernetted chain (FHNC) procedures for calculating the energy expectation value and other quantities of physical interest are derived in correspondence to the following two cases: (a) polarized Fermi systems described...
Immunophenotyping of B cell chronic lymphocytic leukaemia (B-CLL) is usually performed by flow cytometry on cell suspensions obtained from peripheral blood, bone marrow or biopsied tissue. Immunohistochemical analysis on routine sections is less commonly performed; however, this approach allows the pathologist and the researcher to appreciate the immuno-architecture of the involved tissues and to...
In the last decade, the use of information technology (IT) in healthcare has taken a growing role. In fact, the adoption of an increasing number of computer tools has led to several benefits related to the process of patient care and allowed easier access to social and health care resources. At the same time this trend gave rise to new challenges related to the implementation of these new technologies.
Clinical Pathways (CPs) are evidence-based recommendation for treating a diagnosis and an effective instrument to decrease undesired practice variability and improve clinician performance. Deviations from CPs might just as well reduce quality of care. Moreover they can be associated to possible adverse events.
Discretization is an important step introduced in the field of Knowledge Discovery in Databases to better represent the knowledge domain and increase the learning speed and performance of Data Reduction and Data Mining algorithms. However, no studies evaluated the benefits of introducing a discretization step into a more complex system. In this study we seek to evaluate how the ChiMerge discretization...
The carotid artery intima-media thickness (cIMT) is commonly deemed an indicator for cardiovascular diseases. Several methods were proposed for the automatic estimation of the IMT on ultrasound carotid images, in order to obtain accurate, objective and repetitive values. One of the most used techniques for image segmentation is the snake, often requiring a preliminary manual phase of parameter tuning...
Many parameters are usually extracted to fully describe the foot-floor-contact of a patient's gait. A single gait score can be useful to help the clinician in pre/post treatment assessment and patient's follow-up. We describe and validate a method to calculate a gait impairment score through a fuzzy classifier. From the foot-switch signal recorded during a subject's gait we extract 8 basographic parameters...
This paper presents a new approach, named Rotation Invariant Subcarrier Mapping (RISM), to Peak-to- Average-Power-Ratio (PAPR) reduction in OFDM systems. This technique enables data transmission over those subcarrier which are dedicated to the PAPR reduction if a state-of-the-art method, Tone Reservation, is employed. We apply RISM to DVB-T2 systems, showing that the reserved tones foreseen by the...
In this paper we deal with Single Carrier Frequency Division Multiple Access (SC-FDMA) as uplink air interface of broadband satellite networks. Interestingly, SC-FDMA enables a significant increase of the spectral efficiency with respect to the state-of-the-art single-carrier systems. However, as witnessed by the recent specification of the Second Generation DVB Interactive Satellite System (DVB-RCS2)...
This paper presents a comprehensive evaluation of three peak-to-average power ratio (PAPR) reduction techniques which were proposed for the inclusion in the DVB-NGH (Next Generation Handheld) standard. After a detailed description of the three techniques, a common evaluation framework is defined, and the three techniques are compared both in their PAPR reduction capability and in their end-to-end...
In the satellite communications component of the future Internet, peer-to-peer mesh connectivity of satellite terminals is an impellent necessity. In particular, delay sensitive applications such as real-time multimedia, collaborative conferencing and cellular backhauling are appealing use-cases for adopting mesh network topologies. Moreover, the use of a single satellite hop for directly connecting...
In this paper we propose the usage of Single Carrier Frequency Division Multiple Access (SC-FDMA) in the Broadband Satellite Return Channel. Notably, SC-FDMA is able to improve the physical layer spectral efficiency with respect to single carrier systems, which has been used so far in the Return Channel Satellite (RCS) standards. However, it requires a strict synchronization and it is also sensitive...
In this paper, we address the problem of OFDM data-aided channel estimation based on the selection of the most significant samples (MSS) of the channel impulse response (CIR), i.e. those samples which contain most of the useful energy. We provide a novel and complete analytical characterization for MSS selection based on threshold crossing, which yields a closed form for the estimate mean-square error...
Some recently proposed robust methods for time domain timing and frequency synchronization in OFDM systems incorporate the use of cross-correlation based threshold detection in their timing adjustment and joint time-frequency algorithms. In this paper, we analyze the threshold criterion used and derive its theoretical performance. This translates into a better characterization of these OFDM synchronization...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.