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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
In metrology, often there arises a task of joint data processing of groups of measurement results. The most striking example is an analysis of data obtained in interlaboratory comparisons. The interlaboratory studies refer to the complex and expensive researches in metrology, which makes the stages of planning measurements, data processing and interpretation of results especially important and meaningful...
This paper presents an effective approach for classification of power quality (PQ) disturbances based on wavelet transform (WT) and support vector machine (SVM). Wavelet transform was applied to disturbance signal in order to obtain decomposition coefficients at six levels that represents signal in time and frequency domain. Eight statistical methods were used to extract features that characterize...
The paper presents examples of the results of experimental research concerning the influence of input signal RMS on the measurement error of harmonics using selected power quality analyzers. The experiments were carried out in a designed and prepared measuring system. The system makes it possible to set selected testing signals. In the case considered, the input signals were, respectively, sinusoidal...
Peculiarities of measuring instruments verification based on the results of their calibration are considered. It is noted that, in contrast to the verification procedure used in the legal metrology, the verification procedure for calibrated measuring instruments have to take into account the measurements uncertainties. In this regard, many measuring instruments, considered compliance after verification...
Quadrature homodyne interferometers are frequently used in dimensional metrology. Their measurement signals exhibit offsets, unequal amplitudes and phase difference. Frequently, there exists a significant component of the measurement noise common to both (Sine and Cosine) quadrature signals, such that the noise of quadrature signals is correlated. Presented is a method for estimation the unknown correlation...
Sleep is a dynamic process which can be described by a finite set of sleep stages. In contrast to the standard discrete Rechtschaffen and Kales sleep model continuous sleep representation provided by the Probabilistic Sleep Model allows to take into account the whole dynamic of the sleep process. However, analysis of the sleep probabilistic curves faces problems when the time misalignment is present...
A chi-square type test statistic for testing the uniformity hypothesis, based on selected values of the sample quantiles of the empirical distribution function, is presented. Critical values of the test statistics are given for several particular choices of the sample quantiles. A good agreement with their asymptotic counterparts occurs for sample sizes of the magnitude 30 and sometimes even for small...
The basic working tool in measurement uncertainty analysis, as advocated in recent discussions related to the possible revision of the Guide to the expression of uncertainty in measurement (GUM), and in particular by its Supplements, is the state-of-knowledge distribution about the quantity derived based on the currently available information. The GUM uncertainty framework (GUF) provides a method...
A causality method based on predictions in reconstructed state spaces is presented and tested in relation to the ability to detect coupling and synchronization of interconnected dynamical systems. The method is demonstrated on a test example of two uni-directionally coupled chaotic systems of Rössler type. The results show that the predictability of the driven system can be improved by incorporating...
One of the most substantial issues of evaluation a gauge calibration is to determine the calibration function. In pursued situation, it means to estimate the parameters of the linear function which express the dependence of the (errorless) measured values using the calibrated gauge on the true measured quantities. Of course, we are interested also in uncertainties of the estimated parameters. In contribution...
In the paper, the controversial claim of the authors [3] that: “Clustering of time series subsequences, which are generated by the sliding window principle, is meaningless” is addressed and thoroughly tested. The test results confirmed the cited claim in respect with the synthetic pattern data, although, minor deviations depending on different window length have been obtained. For the retrospective...
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