In recent years, the development of systems for processing and analyzing large amounts of data (so-called Big Data) has become an important sub-discipline of software engineering. However, to date there exits no compr...
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ISBN:
(纸本)9781538673843
In recent years, the development of systems for processing and analyzing large amounts of data (so-called Big Data) has become an important sub-discipline of software engineering. However, to date there exits no comprehensive summary of the specific idiosyncrasies and challenges that the development of Big Data systems imposes on software engineers. With this paper, we aim to provide a first step towards filling this gap based on our collective experience from industry and academic projects as well as from consulting and initial literature reviews. The main contribution of our work is a concise summary of 26 challenges in engineering Big Data systems, collected and consolidated by means of a systematic identification process. The aim is to make practitioners more aware of common challenges and to offer researchers a solid baseline for identifying novel software engineering research directions.
The primary factor affecting the inaccuracy of the power system models is the temperature variation of the power line conductors due to weather parameter changes. In the case of short lines, the influence of temperatu...
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The primary factor affecting the inaccuracy of the power system models is the temperature variation of the power line conductors due to weather parameter changes. In the case of short lines, the influence of temperature on the total resistance and reactance of the line may be neglected, but when considering of the long power lines, the outflow of operating and cooling conditions of the conductors becomes noticeable. The article analyzes the impact of taking into account or neglecting the temperature of power line wires in the power system model on the results of optimization of set points for generation sources in the system. The method of adaptation of the power system model is presented, and the differences resulting from the use of static and adaptable models were examined.
We report on the inelastic-scattering rate of electrons on phonons and relaxation of electron energy studied by means of magnetoconductance, and photoresponse, respectively, in a series of strongly disordered supercon...
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We report on the inelastic-scattering rate of electrons on phonons and relaxation of electron energy studied by means of magnetoconductance, and photoresponse, respectively, in a series of strongly disordered superconducting NbN films. The studied films with thicknesses in the range from 3 to 33 nm are characterized by different Ioffe-Regel parameters but an almost constant product qTl (qT is the wave vector of thermal phonons and l is the elastic mean free path of electrons). In the temperature range 14–30 K, the electron-phonon scattering rates obey temperature dependencies close to the power law 1/τe−ph∼Tn with the exponents n≈3.2–3.8. We found that in this temperature range τe−ph and n of studied films vary weakly with the thickness and square resistance. At 10 K electron-phonon scattering times are in the range 11.9–17.5 ps. The data extracted from magnetoconductance measurements were used to describe the experimental photoresponse with the two-temperature model. For thick films, the photoresponse is reasonably well described without fitting parameters, however, for thinner films, the fit requires a smaller heat capacity of phonons. We attribute this finding to the reduced density of phonon states in thin films at low temperatures. We also show that the estimated Debye temperature in the studied NbN films is noticeably smaller than in bulk material.
Combinatorial interaction testing is an important software testing technique that has seen lots of recent interest. It can reduce the number of test cases needed by considering interactions between combinations of inp...
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In this work we present an experimental characterization of an all-dielectric chiral metasurface, based on elliptic dielectric resonators (EDRs). The fabricated chiral metasurface achieves a large circular dichroism o...
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ISBN:
(纸本)9781538653890;9788957083048
In this work we present an experimental characterization of an all-dielectric chiral metasurface, based on elliptic dielectric resonators (EDRs). The fabricated chiral metasurface achieves a large circular dichroism over two bands (17.55-17.61 GHz and 17.91-18.05 GHz), with ellipticities close to 45°, which shows that the fabricated structure can be used as circular polarization filter and circular polarizer at frequency bands indicated above.
Pairwise strategies have tested effectively a range of software and hardware systems. These testing strategies offer solutions that can substitute exhaustive testing. In simple terms, a pairwise testing strategy signi...
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A method to perform spectrum analysis on low power signals between 0.1 and 10 THz is proposed. It utilizes a nanoscale antiferromagnetic tunnel junction (ATJ) that produces an oscillating tunneling anisotropic magneto...
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Functional connectivity (FC) analysis constitutes a fundamental neuroscientific approach that has been extensively used for the investigation of brain's connectivity and activation patterns. To that end, several s...
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