400 research outputs found
Enron versus EUSES: A Comparison of Two Spreadsheet Corpora
Spreadsheets are widely used within companies and often form the basis for
business decisions. Numerous cases are known where incorrect information in
spreadsheets has lead to incorrect decisions. Such cases underline the
relevance of research on the professional use of spreadsheets.
Recently a new dataset became available for research, containing over 15.000
business spreadsheets that were extracted from the Enron E-mail Archive. With
this dataset, we 1) aim to obtain a thorough understanding of the
characteristics of spreadsheets used within companies, and 2) compare the
characteristics of the Enron spreadsheets with the EUSES corpus which is the
existing state of the art set of spreadsheets that is frequently used in
spreadsheet studies.
Our analysis shows that 1) the majority of spreadsheets are not large in
terms of worksheets and formulas, do not have a high degree of coupling, and
their formulas are relatively simple; 2) the spreadsheets from the EUSES corpus
are, with respect to the measured characteristics, quite similar to the Enron
spreadsheets.Comment: In Proceedings of the 2nd Workshop on Software Engineering Methods in
Spreadsheet
Further evidence that the transition of 4D dynamical triangulation is 1st order
We confirm recent claims that, contrary to what was generally believed, the
phase transition of the dynamical triangulation model of four-dimensional
quantum gravity is of first order. We have looked at this at a volume of 64,000
four-simplices, where the evidence in the form of a double peak histogram of
the action is quite clear.Comment: 12 pages, LaTeX2
Characterisation of friction behaviour of intact soft solid foods and food boli
Methodologies to quantify friction forces between soft solid foods or food boli and (model) oral surfaces are desired to better understand how changes in food properties during oral processing affect sensory perception. In this short communication, friction forces (FF) occurring between polydimethylsiloxane (PDMS) surfaces and intact soft solid foods/boli were quantified. As models for intact foods, we used gelatine gels varying in composition and particle size, and sausages were used as an example for real foods. Friction forces measured during the relative motion of intact foods against a rough PDMS surface (“oral surface”), strongly depended on the composition of the food. Friction forces were significantly lower for PDMS against emulsion-filled gels, than for PDMS against unfilled gels, likely due to the lubricating effect of released oil from the gel. Moreover, sausages, displayed significantly higher friction forces than gelatine gels when moving against the PDMS probe, presumably linked to differences in the surface of the foods. The friction forces observed for the PDMS probe moving against food boli were dependent on particle size and saliva quantity; boli with larger particle sizes showed significantly lower friction forces, whereas the addition of saliva to food boli first increased friction forces, but with increasing amount decreased the friction forces significantly. We conclude that the presented methodology is able to quantify the friction behaviour of intact soft solid foods and boli directly, taking into account (i) the effect of composition and added fillers, (ii) serum or oil release and (iii) bolus particle size.</p
Effects of Lorentz invariance violation on cosmic ray photon emission and gamma ray decay processes
In this work, we use Lorentz invariance violation (LIV) introduced as a
generic modification to particle dispersion relations to study some
consequences of single photon emission, known as vacuum Cherenkov radiation,
and photon decay processes in cosmic and gamma rays. These processes are
forbidden in a Lorentz invariant theory but allowed under the hypothesis of
LIV. We show that the emission rate have a dependency on the cosmic ray primary
mass and the electric charge that could modify the UHECR spectrum. Furthermore,
LIV dramatically enhances photon decay into an electro-positron pair above
certain energy threshold. This last effect can then be used to set limits to
the LIV energy scale from the direct observation of very high energy cosmic
photon events by telescopes of gamma-rays.Comment: Proceedings of the 35th International Cosmic Ray Conference (ICRC
2017), Busan, Kore
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