Gioele Barabucci, Paolo Ciancarini, Angelo Di Iorio, Fabio Vitali
Software changes over time: not only the source code but also its models and documentation, configuration files, messages payloads, and so on. Diff algorithms help users to track such evolution. These algorithms vary a lot in terms of efficiency, resources consumption, internal strategies and final results. The focus of this paper is on measuring and comparing the quality of the output produced by these algorithms. There is no univocal definition of quality in this context. We propose a top-down approach to characterise deltas, in order to investigate which is the most suitable algorithm for...
TC4 Symposium 2014
· TC4
· 2014
· Download
Luigi Buglione
From the mid ‘70s on, a plenty of attention was devoted to evaluate and measure software quality. As Tom Demarco said: “you cannot control what you cannot measure”. But coming back, it’s also true that “you cannot measure what you cannot define” and again “you cannot define what you don’t know”. Thus, moving from definition is the priority for any activity and creates also measures from a common, shared definition. The FCM (Factor-Criteria-Model) was the first ‘quality model’ in 1977 by the US Air Force trying to state a “three-tier” model for defining what quality could be for a software...
TC4 Symposium 2014
· TC4
· 2014
· Download
Luca Santillo
The real challenge in any activity is to minimize as much as possible the error between an estimate and an actual value, whatever the phenomenon to be evaluated. When dealing with software, the number of proxies can be quite high: the application of an algorithm including one or more independent variables (measures) is finalized to provide one or more output variables (estimates) for a series of measures typically about effort, cost, time, quality or other aspects of the software being developed. Recently ISO proposed also a specific standard on Measurement (ISO/IEC 15939), with a glossary...
TC4 Symposium 2014
· TC4
· 2014
· Download
Vasilis Kolias, Ioannis Anagnostopoulos, Eleftherios Kayafas
In this paper we present a preliminary analysis over the largest publicly accessible web dataset: the Common Crawl Corpus. We measure nine web characteristics from two levels of granularity using MapReduce and we comment on the initial observations over a fraction of it. To the best of our knowledge two of the characteristics, the language distribution and the HTML version of pages have not been analyzed in previous work, while the specific dataset has been only analyzed on page level.
TC4 Symposium 2014
· TC4
· 2014
· Download
Zygmunt L. Warsza, Stefan Kubisa
In this paper the statistical properties of midrange as estimator of measured value, for the samples of varying number of observations taken from a population of uniform distribution, were examined by the Monte Carlo simulation. The midrange of such samples had a smaller standard deviation than the mean value recommended by the Guide GUM (Fig. 1). A distribution similar to Student’s t-distribution and an expanded uncertainty were also calculated for such samples (chapters 3 and 4). In chapter 5 it was found that for samples from the general population of Flatten-Gaussian distribution, with...
TC4 Symposium 2014
· TC4
· 2014
· Download
Nicola Giaquinto, Laura Fabbiano, Amerigo Trotta, Gaetano Vacca
There are two well-known and different approaches to statistical inference and hypothesis testing, i.e. the frequentist (or orthodox) and the Bayesian one. Consequently, there are also (if one stays in the framework of probability theory) two rival approaches to uncertainty. The present work is partly a tutorial, aimed at explaining the basic aspects of the two approaches, and their relationship with the GUM; and partly a demonstration that the implementation of the Bayesian approach in the GUM Supplement 1 is too rigid. In particular, objective Bayesianism is incompatible with the...
TC4 Symposium 2014
· TC4
· 2014
· Download
Daniel Belega, Dominique Dallet, Dario Petri
This paper proposes a new two-point Interpolated Discrete Fourier Transform (IpDFT) method for the amplitude estimation of a sine-wave with high rejection capability of the spectral interference from the image component. The method is based on the Maximum Sidelobe Decay (MSD) windows. The analytical expression of both the proposed amplitude estimator and its variance due to additive white noise are derived. Computer simulations and experimental results show that the proposed estimator outperforms both the classical IpDFT and the three-point IpDFT methods when the number of acquired sine-wave...
TC4 Symposium 2014
· TC4
· 2014
· Download
Alessandro Ferrero, Marco Prioli, Simona Salicone
In the last years, the Authors have proposed the Theory of Evidence as the mathematical framework to handle measurement uncertainty, and the possibility distribution as the mathematical variable to represent it. The mathematical Theory of Evidence is more general than the well known probability theory and appears to be more suitable to represent all possible kinds of uncertainty contributions. The aim of this paper is to give a general overview of this theory, showing its potentialities and the obtained results.
TC4 Symposium 2014
· TC4
· 2014
· Download
Nicola Pompeo, Kostiantyn Torokhtii, Enrico Silva
The measurement of the microwave surface impedance is a fundamental characterization tool for a wide class of conducting, semiconducting and superconducting materials. In many cases, material anisotropy can show up as an intrinsic or tailored property, and its measure is often desirable. Microwave resonators can be designed to give at the same time nondestructive and highly sensitive measurements, in particular with the surface perturbation method for planar samples. Rectangular resonators can be designed to preserve sensitivity to the anisotropy of the samples under study, since they can...
TC4 Symposium 2014
· TC4
· 2014
· Download
Lucio Fiscarelli, Olaf Dunkel, Stephan Russenschuck
A large variety of magnetic measurement requirements arises from the multiple accelerator projects at CERN, such as MedAustron, SESAME, HIE-ISOLDE, ELENA, and Linac4. Limited resources and a narrow time scale impose optimized procedures and instrumentations. Standardization of measurement equipment becomes essential in order to increase efficiency in terms of installation time and workflow. This paper gives an overview of the ongoing effort to optimize CERN measurement resources by keeping a suitable measurement quality. A flexible control and acquisition software, a standard drive unit,...
TC4 Symposium 2014
· TC4
· 2014
· Download