Karol Korcz, Beata Palczynska, Ludwik Spiralski
DIGITAL METHOD OF MEASUREMENT OF UNWANTED SIGNALS IN COMMUNICATION RECEIVERS

The software way of the estimation of the quantities the unwanted signals, on the basis of the digital data, at a communication receiver output has been presented. Advantages of the presented digital method in comparison with these recommended by the standard methods have been given. Thanks to the use of the separating operation of random and determined components in the digital stored measuring signal, the very low measurement errors of the estimated parameters have been achieved.

Pekka Kumpulainen, Kimmo Hätönen, Pekko Vehviläinen
AUTOMATIC DISCRETIZATION IN PREPROCESSING FOR DATA ANALYSIS IN MOBILE NETWORK

Several data mining methods require discretization of the data, rough sets and association rules for example. In this paper we present simple discretization methods for two types of variables common in telecommunications network. The variables are first classified in order to apply the proper discretization method. These methods are based on the amplitude distribution of the variables. Methods are unsupervised, i.e. they do not require class information for the samples.

Stanislaw Moskowicz
A CONTACTLESS TWO-SENSOR DC TRANSDUCER – TRANSDUCTION FUNCTION ANALYSIS

In the paper the design and operation principle of a contactless two-sensor DC transducer is presented. The operation of the transducer makes use of the signal yielded by two fluxgate sensors based DC transducer situated at a certain distance from the wire traversed by the current to be measured. The proposed geometrical arrangement of the sensor makes the transduction accuracy less sensitive to inaccurate keeping the distance between the sensor and the wire flowed through by the current to be measured.

Luka Ferkovic, Josip Butorac
DETERMINATION OF EQUIVALENT PARAMETERS FOR INDUCTANCE STANDARDS

The confidence in self inductance base can be obtained by regular comparisons between particular metrological laboratories and by mutual comparisons of inductance standards within own laboratory. Standard methods of inductance measurements in its applications don't give explicitly all of parameters of standard substitute circuit nor the accuracy which is requested by fundamental principles of inductance standard calibration. In order to ensure the adequate low measurement uncertainty, which suits these requirements, it is necessary to elaborate the procedure of standard calibration.

Giovanni Bucci, Ivano Caschera, Edoardo Fiorucci, Carmine Landi
A SMART POWER QUALITY SENSOR FOR THE EVALUATION OF FLICKER EFFECT

The monitoring of power quality (PQ) on supply networks is today an issue of worldwide interest. In this field, one of the most important parameter is the flicker effect, a phenomenon due to luminance fluctuations of the lighting caused by voltage variations. The IEC standardized the implementation of a flickermeter, to supply information about the human reaction to the voltage amplitude modulation. Starting from a different flicker measurement approach proposed by the authors, in this paper a low-cost smart flicker sensor has been designed and applied. The proposed sensor can transmit data over a TCP-IP network, in order to allow for a remote monitoring of power quality. The performance of the proposed device has been compared with a standard flickermeter and the main experiment results reported.