Jan Obrzut
We present measurements demonstrating significant scattering of microwaves in thin metal films near the metal – non-metal percolation transition. Gold films 3 nm to 12 nm thick were characterized using patterned coplanar waveguides over a frequency range of 100 MHz to 20 GHz. Within the percolation coverage of gold nanoparticles when conductivity > 5 x 103 S/cm and the film properties transition from the dielectric to metallic, the microwave transmittance falls far more rapidly than the classical skin depth model would suggest. We observe a frequency-independent absorption peak of about 50 %...
TC4 Symposium 2014
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· 2014
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Paco Bogónez -Franco, Pascale Pham, Claudine Gehin, Bertrand Massot, Georges Delhomme, Regis Guillemaud, Eric McAdams
Segmental and regional bioimpedance measurements have become of great clinical interest in the monitoring of many pathologies. However, the use of commercial bioimpedance analyzers to carry out measurements on small segments of the body, with their associated low inter-electrode tissue impedances, leads to some unexpected problems. Low interelectrode tissue impedances are very prone to adverse effects resulting from the relatively large electrode contact impedances and, especially, from electrode contact impedance mismatches. The authors highlight these problems, first with measurements on...
TC4 Symposium 2014
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Jana Pařílková, Jaroslav Veselý, Michael Novák
The paper describes some of the results of measurement changes electrical properties in the central sealing core of the earth-fill dam Karolinka (Czech Republic) before and after the reconstruction. Other results, shown like pilot measurement, are from the monitoring of snow cover (Austria). Both areas of experiments are done with the view of climate changes for obtaining more information about floods and dry. The measurement was performed using the method of electrical impedance spectrometry and a Z-meter III or Z-meter IV devices which were developed and constructed through the projects of...
TC4 Symposium 2014
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Fernando M. Janeiro, Jorge R. Costa, Carlos A. Fernandes, Pedro M. Ramos
The characterization of linear electrical components for frequencies up to a few MHz can be performed through impedance spectroscopy techniques that include the determination of the impedance frequency response and the algorithms that identify the equivalent circuit components. However, at higher frequencies some extra challenges are present since it is not practical to measure the impedance frequency response and s-parameters must be used. Although the conversion between s-parameters and equivalent impedance is well known, the application of the circuit identification algorithms is not...
TC4 Symposium 2014
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José Santos, Fernando M. Janeiro, Pedro M. Ramos
This paper describes the optimization of the measurement time of the impedance frequency response of a vibrating wire sensor for viscosity estimation. The optimization deals with the assessment of the estimated viscosity as a function of the number of measured impedance frequency points as well as the selection of those frequencies. This speed optimization is important to ensure that the viscosity measurements are influenced as little as possible by external environmental parameters such as temperature and pressure.
TC4 Symposium 2014
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· 2014
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Diana Trojaniello, Andrea Cereatti, Laura Mori, Andrea Ravaschio, Ugo Della Croce
The estimation of gait temporal parameters with wearable inertial measurement units (IMU) has been a research topic of interest in clinical gait analysis. Several methods, based on the use of a single IMU, have been proposed for their estimate, showing in most cases a sufficiently low number of missed and extra events and a satisfactory accuracy when applied to the gait of healthy subjects. In this study, we hypothesized that the same does not hold for abnormal gait. Some of the methods were applied to the gait of a group of hemiparetic subjects and to a group of healthy elderly. The results...
TC4 Symposium 2014
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Enrico M. Staderini, Jérôme Rampazzo
A prototype of an experimental set-up has been built to identify human implemented motorcognitive control function in a loop control task. Manmachine systems or systems where the human operator is embedded into the control loop (human-inthe-loop) are known and studied since the beginning of the cybernetics in the 60’s of last century. Modern technologies permit to rediscover and reuse human regulatory models to be of help in many areas like sport performance evaluation and neurodegenerative diseases assessment.
TC4 Symposium 2014
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Erika Rovini, Dario Esposito, Carlo Maremmani, Paolo Bongioanni, Filippo Cavallo
This paper presents a novel wearable sensor system based on the integration of miniaturised IMUs for fine hand movement analysis. The system, named SensHand V1, is composed of full 9-axis inertial sensors, placed on the fingers and wrist, which are managed by a cortex-M3 microcontroller. The acquired data are sent to a data logger through the use of Bluetooth communication. In this paper, the system is used for the objective diagnosis of Parkinson's disease, which is commonly assessed by neurologists through visual examination of motor tasks and semi-quantitative rating scales. Here, these...
TC4 Symposium 2014
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Luigi Iuppariello, Giovanni D’Addio, Paolo Bifulco, Giuliana Faiella, Bernardo Lanzillo, Nicola Pappone, Mario Cesarelli
Upper limb reaching movements (RM) are the most used motor task in robotic rehabilitation treatments of several disorders of the arm and the shoulder. Robotic rehabilitation allow to record quantitative data about movement patterns that can help clinicians to better address the rehabilitation protocols providing information not captured using clinical measures, but the biomechanical parameters proposed until today, to evaluate the quality of the movement, are related to the specific robot used and to the type of exercise performed and are not yet standardized. In this paper a quantitative...
TC4 Symposium 2014
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Fabrizio Russo
Noise cancellation and detail preservation are two conflicting goals in the design of any denoising filter. In order to specifically measure these features, vector metrics have been recently introduced for grayscale and color images. This paper provides, for the first time, a study of the accuracy of the main algorithms in the literature focusing on the case of Gaussian noise. A novel vector method is also proposed to overcome the inaccuracies of current techniques.
TC4 Symposium 2014
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· 2014
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