Daniel Belega, Dario Petri, Dominique Dallet
This paper analyses Mean Square Error (MSE) of a noisy sine-wave amplitude estimator based on the Discrete-Time Fourier Transform (DTFT) evaluated at the signal frequency estimated by the classical Interpolated Discrete Fourier Transform (IpDFT) algorithm. In order to reduce the contribution of the spectral image component on the returned estimates, the sine-wave is weighted by a Maximum Sidelobe Decay (MSD) window. An analytical expression for the estimator MSE is derived. For given Signal-to-Noise Ratio (SNR) and number of processed samples, that expression allows us to derive the minimum...
TC4 Symposium 2017
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R. Gassino, G. Perrone, A. Vallan
The paper discusses the main issues related to the usage of Fiber Bragg Gratings as temperature sensors when they are employed to monitor percutaneous laser ablation of tumors. After a description of the main problems related to this specific application, two different setups for the characterization and the qualification of these sensors are described and preliminary results are presented.
TC4 Symposium 2017
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Vítor Viegas, J. M. Dias Pereira, Octavian Postolache, Pedro Silva Girão
Walker assistive devices should be used properly in order to provide maximum safety and comfort to the user. We define two risk indexes to monitor walker usage, one related with force unbalance, and the other related with motor incoordination. We present a measurement system capable of measuring these two indexes and prevent potential risk situations. Force unbalance is measured using load cells attached to the walker legs. Motor incoordination is estimated by synchronizing force measurements with kinematic data provided by an Inertial Measurement Unit (IMU). The measurement system is...
TC4 Symposium 2017
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Bogdan C. Neagu, Gheorghe Grigoraș
Today, power distribution operators are concerned about irregular behavior of electricity consumption in their decision-making process. In the load data, abnormal consumptions may happen due to measurement error, undetected consumption, illegal electricity connection, improperly installed equipment etc. The paper presents a statistical approach which acquires the basic concept of knowledge discovery on databases (KDD)with data mining, focuses on the identification of outliers (irregular consumption) from load curves recorded by Smart Meters on the substation of the power distribution...
TC4 Symposium 2017
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Andrea Rossi, Francesco Orsini, Andrea Scorza, Fabio Botta, Fabio Leccese, Enrico Silva, Kostiantyn Torokhtii, Ivan Bernabucci, Salvatore Andrea Sciuto
Nowadays a large number of studies are being carried out on active vibration control, especially in the aeronautical gas turbine industry. Indeed, uncontrolled vibration in aeronautical engine blades can lead to fatigue failure with catastrophic consequences. For this reason, many efforts are made to implement an embedded active vibration control on rotors. Furthermore in this particular kind of application a compact, integrated and robust system, controlled by a wireless remote system, is necessary. Before designing the vibration active control it is mandatory to characterize the vibration...
TC4 Symposium 2017
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Andrea Scorza, Daniele Pietrobon, Francesco Orsini, Salvatore Andrea Sciuto
Ultrasound Colour Flow is an imaging technique that combines velocity with anatomical information obtained by means of ultrasonic Doppler techniques and pulse-echo methods respectively to generate colour coded maps of the blood flow velocity superimposed on grey-level images of the tissue anatomy. Ultrasound Colour Flow Imaging (CFI) has been found to be effective in assessing blood flow in many clinical conditions and its use is widespread in many diagnostic applications. Although this technique for obtaining the blood velocity information is technically demanding and requires specific...
TC4 Symposium 2017
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L. Schinaia, A. Scorza , F. Orsini,S. A. Sciuto
This paper describes a preliminary study on feature selection from the gray level co-occurrence matrix (GLCM) among the 14 features proposed by R.M. Haralick (1979) with the aim to apply them to ultrasound image classification and Quality Assessment. In particular4 main-classes of images with different patterns (Lines, Chess, alternates Row and Circles)have been implemented and different levels ofspeckle noisehave been added to simulate ultrasound images with different textures.With the aim to characterize therelationship betweenHaralickfeatures and the pattern type, size, contrastand noise,...
TC4 Symposium 2017
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L. Schinaia, A. Scorz, F. Orsini, S. A. Sciuto
The current study is focused on an image segmentation algorithm for Uniformity Quality assessment in Diagnostic Ultrasounds.In particular a mathematical definition of the uniformity in ultrasound images is introducedand a split and merge algorithm performed on sparse matricesto measure uniformity is described. The algorithm is based on the Gray-Level Co-occurrence Matrices and the relativedescriptors,i.e. the Haralick features Entropy, Energy, Maximal CorrelationCoefficientand InformationMeasures of Correlation.Results on2 differentdatasetsof test images with different nonuniformities have...
TC4 Symposium 2017
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A. Rossi, F. Orsini, F. Botta, A. Scorza, L. Schinaia, D. Bibbo, S. A. Sciuto
In the last decades, many studies have been conducted on the biological effects resulting from Whole-Body Vibration (WBV) platforms, even if benefits or side effects resulting from exposure to whole-body vibrations in sport and rehabilitation applications are often conflicting. These discrepancies are likely due also to different operating conditions such as load, unload, load position on footboard, etc. Since acceleration differences could affect the biological response of the person it would be suitable to verify the actual vibrations. Nevertheless a standard and widespread accepted method...
TC4 Symposium 2017
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Francesco Orsini, Andrea Rossi, Andrea Scorza, Fabio Botta, Salvatore Andrea Sciuto
There are many commercial WBV platforms for clinical applications but in literature very few have been tested to verify their actual amplitude, frequency spectra and waveform shape of vibration, although some clinical studies showed that these parameters can influence significantly the muscles performance. In this study the performances of a prototype WBV1 designed by the authors are compared with a commercial platform WBV2 typically used in clinical and rehabilitation investigations. Tests performed with four accelerometers in 3 different directions show the presence of transversal...
TC4 Symposium 2017
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