Современные информационные технологии в профессиональной деятельности: труды международной научно-практической конференции "СИТ-2014"
The methodology of application of circuit simulation programs in the educational process of learning students of information and technical specialties in the system of higher and specialized secondary education is under consideration in the article. There is an example of the use of this methodology for computer simulation and studying the principles of designing and working of the random access memory of the microcomputer using Electronics Workbench.
The workshop is intended for the acquisition of practical skills of computer simulation and study of the functional components and devices of microcomputers using circuit simulation program "Electronic Workbench" students of higher and secondary educational institutions, students of architecture, organization, circuitry and computer modeling of digital components and devices of the computer.
The paper gives brief information about the program of circuit simulation, Electronics Workbench and its working components. The questions of using this program for modeling and research of microcomputers are reviewed. Structural and functional schemes 4-bit microcomputers are discussed.
The article deals with the general approach to the construction of a distributed system of circuit simulation as part of information support of the product life cycle. The implementation of these approaches is demonstrated on the example of the creation of one of the elements of the system. This work/article is an output of a research project implemented as part of the Basic Research Program at the National Research University Higher School of Economics (HSE).
This paper presents a new integration technique for time-domain simulation of nonlinear electronic circuits. The new technique exploits A-stable single-step integration methods of order 1 up to 4 obtained by applying the Obreshkov formula to charge oriented circuit equations. The predictor-corrector algorithm exploited in the transient analysis for solving the initial value problem is described. The numerical examples of time-domain simulation are given which demonstrate the numerical accuracy and efficiency of the proposed technique.
The possibilities of commercial SPICE are expanded in the new field—space environment electronics design. For this purpose, the set of BJT and MOSFET models with account for radiation influence is included into commercial SPICE device library. The characteristics of devices and circuits subjected to space radiation exposure (gamma-rays, protons, neutrons, electrons, heavy ions) are presented and examined with emphasis on application for radiation hardened electronics systems.
Qucs open-source circuit simulator and its applications for educational and research applications in field of EMC and ESD are considered. Its advantages and disadvantages are considered. New features introduced in Qucs are considered. One of the authors is Qucs developer.
In this paper, power MOS transistor behavior under charged board model (CBM) ESD impact is considered. The analysis of the MOSFET failure condition at the CBM ESD event is performed. The CBM equivalent circuit is proposed. The physical parameters of the PCB and device under test are replaced by the lumped RCL circuit. The MOSFET failure voltage calculation method is developed. This method is based on the transient analysis of the CBM ESD equivalent circuit with the general purpose open-source circuit simulator Qucs. This simplified method allows us to calculate CBM ESD voltage dangerous for the MOSFET with less than 20% error for some application cases (pins without ESD protection). CBM ESD tests are performed. Simulation and measurement results are in good match.
Event logs collected by modern information and technical systems usually contain enough data for automated process models discovery. A variety of algorithms was developed for process models discovery, conformance checking, log to model alignment, comparison of process models, etc., nevertheless a quick analysis of ad-hoc selected parts of a journal still have not get a full-fledged implementation. This paper describes an ROLAP-based method of multidimensional event logs storage for process mining. The result of the analysis of the journal is visualized as directed graph representing the union of all possible event sequences, ranked by their occurrence probability. Our implementation allows the analyst to discover process models for sublogs defined by ad-hoc selection of criteria and value of occurrence probability
Let G be a semisimple algebraic group whose decomposition into the product of simple components does not contain simple groups of type A, and P⊆G be a parabolic subgroup. Extending the results of Popov , we enumerate all triples (G, P, n) such that (a) there exists an open G-orbit on the multiple flag variety G/P × G/P × . . . × G/P (n factors), (b) the number of G-orbits on the multiple flag variety is finite.
I give the explicit formula for the (set-theoretical) system of Resultants of m+1 homogeneous polynomials in n+1 variables