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2023 Ivannikov ISPRAS Open Conference, ISPRAS 2023

作者： Mkoyan, Ruslan Romanova, Daria Sargsyan, Sevak Epikhin, Andrey Russian-Armenian University Ivannikov Institute for System Programming of the Ras Center of Advanced Software Technologies Yerevan Armenia Ivannikov Institute for System Programming of the Ras Lomonosov Msu Moscow Russia Ivannikov Institute for System Programming of the Ras Moscow Russia

ISBN: (纸本)9798350349993

This paper presents a calculation of the aerodynamic characteristics of the ZOHD Alpha Strike UAV model, designed with a delta wing. The focus of the study is the overall layout of the aircraft and the influence of the propeller on its aerodynamic characteristics. The computational fluid dynamics tool OpenFOAM is used as an effective method to solve the complex aerodynamic problems inherent in this UAV model. Research is carried out in an incompressible flow, due to the low speeds inherent in such aircraft. A numerical methodology is proposed for quick evaluation of the aerodynamic performances of UAV models with a propeller. A simple dynamic model and flight data are presented. The calculation results are verified using a flight experiment. © 2023 IEEE.

关键词： Computational fluid dynamics

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Gradient Method Optimization of a Race Car Wing Airfoil at the Conceptual Design Phase 8th

Gradient Method Optimization of a Race Car Wing Airfoil at t...

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8th International Conference on Industrial Engineering, ICIE 2022

作者： Korobko, D.D. Mikaeva, S.A. Institute of Advanced Technologies and Industrial Programming of RTU MIREA 78 Vernadsky Avenue Moscow119454 Russia

ISBN: (纸本)9783031141249

Racecar wing airfoil optimization at the concept modeling stage based on NACA series airfoils with gradient descent method and finite volume method of aerodynamic characteristics calculation was studied. For efficiency estimation of the method, the problem of downforce coefficient maximization of the airfoil at zero angle of attack was considered. Simulations were performed using Open FOAM, which is an open source CFD software based on a finite volume method. The Spalart-Allmaras turbulence model was chosen for a steady-state two dimensional CFD analysis of an airfoil. Blockmesh utility was used for structured mesh generation. Airfoil parameterization, mesh generation, numerical simulation and optimization routine are automated with Python script. This study showed that gradient descent method optimization required low number of iterations for this type of problem. The goal of the algorithm was achieved and some high-downforce airfoils were found. The methodology could be used to carry out further optimization studies of many parameterized shapes for many different applications. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Optimization

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advanced Grammar-Based Fuzzing

Advanced Grammar-Based Fuzzing

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2022 Ivannikov Memorial Workshop, IVMEM 2022

作者： Sargsyan, Sevak Hakobyan, Jivan Mehrabyan, Matevos Mkoyan, Ruslan Sahakyan, Vardan Melkonyan, Vahagn Arutunian, Mariam Fahradyan, Arman Avetisyan, Arutyun Russian-Armenian University Center of Advanced Software Technologies Yerevan Armenia Programming of the RAS Ivannikov Institute for System Moscow Russia

ISBN: (数字)9781665492973

ISBN: (纸本)9781665492973

This article presents novel method for efficient fuzzing of programs accepting complex structured data. It generates input data based on formal grammar description. Data generator is periodically autoconfigured based on target programs code coverage. It means that the type of generated programs is dynamically changed to increase code coverage. Data generator uses descriptions of BNF (Backus-Naur Form) rules in ANTLR (ANother Tool for Language Recognition) platform. More than 250 languages and data formats are supported. Every rule of grammar is designed as universal pushdown automata, which allows automatically generate BNF compatible data by traversing automata. We added weights for each transition of automata to provide priority of highly efficient paths (sequence of transitions). These weights are automatically changed by fuzzing engine, which provides data generator adaptation based on the coverage of the target programs. According to experimental results, we were able to increase code coverage significantly for several widely used programs including compilers. © 2022 IEEE.

关键词： Automata theory

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Technological parameters of thin-film pulsed laser scribing for perovskite photovoltaics

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Clean Energy 2024年第3期8卷 127-135页

作者： Rustam Ishteev Pavel Gostishchev Mariia Tiukhova Anton Sorokin Arthur Ishteev Vladimir Kondratenko Laboratory of Precision Machining of Materials Department of NanoelectronicsInstitute for Advanced Technologies and Industrial ProgrammingRTU MIREAMoscowRussia Research and Practical Clinical Center for Diagnostics and Telemedicine Technologies of the Moscow Health Care Department MoscowRussia Laboratory of Advanced Solar Energy(LASE) National University of Science and Technology MISIS4 Leninsky St.MoscowRussia Semenov Federal Research Center of Chemical Physics Russian Academy of Sciences(RAS)4 Kosygina str.MoscowRussia

Over the past decade,the power conversion efficiency of halide perovskite solar cells has shown a rapid increase to 26.1%.The significant efficiency growth and the relative simplification of the technology for obtaining thin-film solar cells due to liquid printing methods determine the high potential for the low-cost perovskite solar cells ***,efficient use of cell geometry is comparable to the size of standard crystalline-Si wafers(156:156 mm and more).Therefore,modular geometry similar to amorphous-Si solar cell approaches is used to scale perovskite solar *** electrical connection of thin-film cells requires precise processing of the conductive layers that form the device p-i-n *** subject of research is the development of a full pulsed laser scribing cycle for inverted perovskite solar *** this work,we propose a study of a laser-patterning technology In_(2)O_(3):SnO_(2)(ITO)conductive layer and a photoactive perovskite layer Cs0,2(CH(NH_(2))_(2))_(0,8)PbI_(3).Process regimes of transparent conducting electrodes based on ITO and halide perovskite layer Cs_(0,2)(CH(NH_(2))_(2))_(0,8)PbI_(3)laser patterning were *** optimal parameters for the multipass mode processing of ITO and perovskite layer were *** cell was electrically isolated at a scribe line width of 30μm.

关键词： patterning perovskite solar cell perovskite solar cell photovoltaics scribing

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Aerodynamic Analysis of Delta Wing Aircraft and Effect of the Propeller Using OpenFOAM

Aerodynamic Analysis of Delta Wing Aircraft and Effect of th...

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Ivannikov ISPRAS Open Conference (ISPRAS)

作者： Ruslan Mkoyan Daria Romanova Sevak Sargsyan Andrey Epikhin Center of advanced software technologies Russian-Armenian University Ivannikov Institute for System Programming of the RAS Yerevan Armenia Lomonosov MSU Ivannikov Institute for System Programming of the RAS Moscow Russia Ivannikov Institute for System Programming of the RAS Moscow Russia

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A blockchain-oriented covert communication technology with controlled security level based on addressing confusion ciphertext

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Frontiers of Computer Science 2025年第2期19卷 133-135页

作者： Lejun ZHANG Bo ZHANG Ran GUO Zhujun WANG Guopeng WANG Jing QIU Shen SU Yuan LIU Guangxia XU Zhihong TIAN Sergey GATAULLIN Cyberspace Institute Advanced Technology Guangzhou UniversityGuangzhou 510006China Research and Development Center for E-Learning Ministry of EducationBeijing 100039China College of Information Engineering Yangzhou UniversityYangzhou 225009China School Math and Computer Science Quanzhou Normal UniversityQuanzhou 362000China Pazhou Lab Guangzhou 510330China School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China Central Economic and Mathematics Institute Russian Academy of SciencesMoscow 117418Russia Industrial Programming Department MIREA-Russian Technological UniversityMoscow 119454Russia

1 Introduction Traditional covert communication[1]usually relies on centralized channels,which are efficient in transmission but susceptible to eavesdropping and attacks,leading to information ***,distributed methods also exist,such as peer-to-peer networks and distributed hash *** technology,which is decentralized,anonymous,non-tamperable and anti-attack,can be applied to covert communication to solve the problems of traditional methods and improve the quality of communication.

关键词： communication tables networks

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Effective rectification of terahertz electromagnetic fields in a ferrimagnetic iron garnet

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Physical Review B 2023年第9期108卷 094439-094439页

作者： T. G. H. Blank E. A. Mashkovich K. A. Grishunin C. F. Schippers M. V. Logunov B. Koopmans A. K. Zvezdin A. V. Kimel Radboud University Institute for Molecules and Materials 6525 AJ Nijmegen Netherlands Department of Applied Physics Eindhoven University of Technology P.O. Box 513 Eindhoven 5600 MB Netherlands Institute of Physics II University of Cologne D-50937 Cologne Germany Kotel'nikov Institute of Radioengineering and Electronics 125009 Moscow Russia Prokhorov General Physics Institute of the Russian Academy of Sciences 119991 Moscow Russia Institute of Advanced Technology and Industrial Programming MIREA Russian Technological University 119454 Moscow Russia

It is found that single-cycle THz electromagnetic fields efficiently excite a GHz spin resonance mode in ferrimagnetic Tm3Fe5O12, despite the near absence of GHz spectral components in the exciting THz pulse. By analyzing how the efficiency of excitation depends on the orientation and strength of the THz electric field, we show that it can be explained in terms of the nonlinear THz inverse Cotton-Mouton effect. Here, the THz electric field gets effectively rectified and acts on the ferrimagnetic spins as a unipolar effective magnetic field pulse. This interpretation is confirmed by a theoretical model based on the phenomenological analysis of the effective magnetic field, combined with the equations of motion derived from the effective Lagrangian for a ferrimagnet. Moreover, by using the outcome of two-dimensional THz spectroscopy, we conjecture a quantum-mechanical interpretation of the observed effect in terms of impulsive stimulated Raman scattering of THz photons by the crystal-field split f−f electronic transitions of Tm3+.

关键词： Faraday effect Magnetism Magneto-optical effect Magneto-optics Nonlinear optics Ultrafast magnetization dynamics Ferrimagnets Magnetic insulators Ferromagnetic resonance Terahertz spectroscopy Ultrafast pump-probe spectroscopy

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Cyclical oscillations and absorbing-state probabilities in optional public goods games: Interplay of reward and group size

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Physical Review E 2025年第1期111卷 014138-014138页

作者： Eduardo V. Stock Pablo Valverde Juan Carlos González-Avella José Roberto Iglesias Sebastian Gonçalves Roberto da Silva Instituto de Física Universidade Federal do Rio Grande do Sul Caixa Postal 15051 91501-970 Porto Alegre RS Brazil Pontificia Universidad Católica del Ecuador Facultad de Ciencias Exactas y Naturales Quito 170525 Ecuador Institute for Cross-Disciplinary Physics and Complex Systems UIB-CSIC Palma de Mallorca 07122 Spain Advanced Programming Solutions SL Palma de Mallorca 07120 Spain Instituto Nacional de Ciência e Tecnologia de Sistemas Complexos CBPF Rio de Janeiro 22290-180 RJ Brazil

The optional public goods game (OPGG) is a three-strategy model in which individuals can cooperate, defect, or not participate. Despite its simplicity, this model effectively captures various social dilemmas, including those involving public services, environmental sustainability, and broader societal issues. In this study, we investigate how the reward (r) and group size of potential players (S) of public goods games influence the steady-state coexistence of these strategies or the alternation of their dominance in a rock-paper-scissors dynamic. The OPGG is simulated using Monte Carlo in a nonspatial scenario, meaning there is no topology connecting the agents, allowing any player to interact with any other player. We show that under sufficiently noisy conditions, the system consistently evolves to an absorbing state, with the prevailing strategy determined by the values of r and S. In the range 2≤r≤S, the system shows multiple stable absorbing states, with groups of size S=4 exhibiting more pronounced and transient rock-paper-scissors dynamics with longer average absorbing times. We present a thorough analysis of our results in terms of the fraction of time the system spends in rock-paper-scissor cycles, the number of cycles, and the average probability that the system relaxes to each possible absorbing state, including scenarios where the system does not reach an absorbing state at all.

关键词： Risk assessment

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Combined strategy for efficient collision detection in 4D planning applications 17

Combined strategy for efficient collision detection in 4D pl...

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17th International Workshop on Intelligent Computing in Engineering, EG-ICE 2010

作者： Semenov, Vitaly Kazakov, Konstantine Zolotov, Vladislav Jones, Huw Jones, Stephan Institute for System Programming Russian Academy of Sciences Moscow Russia Advanced Construction Technologies - UK Coventry United Kingdom

ISBN: (纸本)9781907284601

Collision detection is the most time consuming component of many geometric reasoning applications like CAD/CAM, robotics and automation, computer graphics, and virtual reality. Performance is also a crucial factor for 4D planning applications targeted on scheduling of large industry projects by means of identifying and resolving of clashes in complex dynamic scenes, containing thousands and millions of objects. Many methods have been proposed and successfully implemented to deal with different statements and peculiarities of the dynamic collision detection problem. In this paper, we develop and analyze a combined strategy that exploits spatial and temporal coherence of scenes appearing in 4D planning applications. The strategy takes into account complexity and large scales of scenes, evolving character of fragments, significant temporal latency, and availability of identical objects. The strategy combines spatial decomposition, bounding volumes and temporal analysis methods yielding substantially faster collision detection than previous known methods being applied separately or discordantly. To implement the strategy, a special spatio-temporal partition schema (STPS) has been proposed and developed. The results are presented in conformity to performance benchmarks relating to architecture, engineering and construction projects. © 2018 Esprit. All rights reserved.

关键词： Benchmarking

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Mass media competition and alternative ordering in social dynamics

arXiv

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arXiv 2024年

作者： Alvarez-Llamoza, O. Cosenza, M.G. Gonzalez-Avella, J.C. Suarez, M.A. Tucci, K. Valverde, P. Universidad Católica de Cuenca C2MAD-CIITT Cuenca010101 Ecuador School of Physical Sciences and Nanotechnology Universidad Yachay Tech Urcuquí Ecuador Institute for Cross-Disciplinary Physics and Complex Systems UIB-CSIC Palma de Mallorca Spain Advanced Programming Solutions SL Palma de Mallorca Spain SUMA-CeSiMo Universidad de Los Andes Mérida Venezuela Pontificia Universidad Católica del Ecuador Facultad de Ciencias Exactas y Naturales Quito Ecuador

We investigate the collective behavior of a system of social agents subject to the competition between two mass media influences considered as external fields. We study under what conditions either of two mass media with different intensities can impose its message to the majority. In addition to a collective state dominated by the stronger mass media and a disordered phase, we characterize two nontrivial effects as the parameters of the system are varied: (i) the appearance of a majority sharing the state of the weaker mass media, and (ii) the emergence of an alternative ordering in a state different from those of either media. We explore the dependence of both phenomena on the topology of the network of interactions. We show that the presence of long-range interactions rather than random connections is essential for the occurrence of both effects. The model can be extended to include multiple mass media and we illustrate it by considering three mass media fields acting on the system. Nontrivial collective behaviors persist for some ranges of parameters: the weakest mass media can convince the majority, and the system can spontaneously order against all applied *** Codes 91-XX, 91D30 © 2024, CC BY-NC-SA.

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