Valerio De Vit, Giuseppe Di Leo, Gabriella Fabbrocini, Alfredo Paolillo, Paolo Sommella
An image based system implementing a well-known diagnostic method is disclosed for the automatic detection of melanomas as support to clinicians. The software procedure is able to recognize automatically the skin lesion within the digital image, measure morphological and chromatic feature, carry out a suitable classification for the detection of structural dermoscopic criteria provided by the 7-Point Check List. Experimental results about the adoption of statistical techniques applied to the border detection, feature extraction and classification as well as the resulting diagnostic score are...
TC4 Symposium 2011
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U. M. Tuz, M. V. Dobrolyubova, A. A. Ulianova
In a given summary the alternate voltage standard, which works over the voltage range from 0,1 V to 1000 V and the frequency range from 10 Hz to 30 MHz is presented. In the paper its structure and the main scientific and technical advancements are considered.
TC4 Symposium 2011
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M. Surdu, D. Surdu
The new approach to the creation of the equivalent voltage dividers is proposed. This approach is based on the synthesis of the signal, having digitally controlled magnitude by the algebraic summing of the signals, having digitally controlled phase. On this base one of the possible bridges structure has been developed and its properties have been analyzed.
TC4 Symposium 2011
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M. Surdu, A. Lameko, D. Surdu, S. Kursin, M. Mukharovsky, A. Akhmadov,S. Shevkun
Comparison and unit transfer of the impedance parameter is provided using a lot of different very complicate manual bridges with numerous different standards. The main world-renowned laboratories (BIPM, NIST, NML, NPL, PTB, VNIIM, etc) in developed countries have their own primary standards, based on the Calculable Capacitor and appropriate transformer bridges, on the Quantum Hall Resistance and appropriate bridges and very accurate quadrature bridges for comparison of different impedance parameters, having original constructions. All these bridges constitute a very complicate set of devices...
TC4 Symposium 2011
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Thiago de Carvalho Batista, Benedito Antonio Luciano, Francisco das Chagas Fernandes Guerra, Raimundo Carlos
This paper describes methods and criterions for errors determination of current transformers (CT). It is shown that there is need for technical standards modifications, because traditional governmental standards tests are based on purely sinusoidal conditions. Based on sampling and composite errors, which can be used for the errors determination in non-sinusoidal system, experimental results are presented, comparing two toroidal CT, one with nanocrystalline alloy core and another with FeSi core both submitted to sinusoidal regime.
TC4 Symposium 2011
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Samuel E. de Lucena
This paperwork presents the design and test of a microcontroller-based ECG (electrocardiogram) simulator. The ECG simulator is capable of generating nine ECG signals and a calibrated square wave (1 Hz, 1 mV at Lead II). The synthesized signals are: normal sinus rhythm (60 beats per minute – BPM, and 90 BPM), sinus bradycardia (30 BPM), sinus tachycardia (120, 180 and 240 BPM), sinus rhythm with tall T wave (6EC0 BPM), ventricular tachycardia (120 BPM), and a rhythm for asynchronous ventricular pacemaker (60 BPM). The simulated ECG signals can have their amplitudes continuously varied from...
TC4 Symposium 2011
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Renata T. de Barros e Vasconcellos, Luiz Macoto Ogino
This paper describes the final construction stage and preliminary measurements results of a low-frequency four terminal-pair coaxial impedance bridge, part of the traceability chain of the capacitance unit to the quantum Hall effect, constructed at Inmetro. The coaxial bridge is a complex system, with several technical advantages, as highstability and very low-uncertainty.
TC4 Symposium 2011
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Albert Garcia-Benadí, Erik Molino-Minero-Re, Antoni Mánuel- Lázaro, Joaquin del Río-Fernandez
Detailed herein is the procedure to perform the calibration of a marine observation instrument, in this case a CTD, within the parameters of temperature, pressure and conductivity. It includes a calibration demonstration of the temperature and the pressure parameters.
TC4 Symposium 2011
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D. Slomovitz, A. Santos
This paper presents the development of a selfcalibrating transformer for using as a primary standard in the Uruguayan National Metrology Institute. Nominal ratios go from 5 A/ 5 A to 2000 A/ 5 A. The ratio of the transformer can be changed using the same primary windings, so that there is no appreciable effect on the errors for different ratios.
TC4 Symposium 2011
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L. Trigo, D. Slomovitz
This paper presents the results of two years of operation of an automatic system that compensates drifts of a rubidium atomic clock. This clock is the base of the Uruguayan National Time-Frequency Standard.
TC4 Symposium 2011
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