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Enhancement of cobalt hydroxide electrochemical performance through morphology control and composite formation
No full textIntroducing chaos and chaos based encryption applications to university students - case report of a seminar
No full textDuring the fall semester of 2021-2022 academic year, a seminar series on ’Chaotic Cryptography’ was delivered at the Department of Computer Aided Design (CAD), St. Petersburg Electrotechnical University ’LETI’, Russia. The seminar aimed at introducing students to state of the art research topics that connect chaos theory to various applications relating to encryption and security. This work constitutes a case report on this seminar. First, the seminar syllabus is presented. Then, future goals are discussed for annual reruns of the seminar
Hardware design and implementation of a wireless chaotic text encryption scheme
No full textThis work proposes a chaotic text encryption scheme implemented in a microcontroller device. Initially, a chaotic 1D map is proposed and studied through its bifurcation diagrams and Lyapunov exponent diagram. The map showcases a constant chaotic behavior, which makes it suitable for use in encrytption. Based on this map, a pseudo random bit generator is designed. This generator is then used as a source of deterministic randomness, in order to encrypt a text message, using XOR. The complete scheme is then implemented in two microcontroller devices that can each implement the encryption and decryption procedures. This allows the safe transmission of an information text between the two devices, and can be the basis for further experimentation
A chaotic path planning method for 3d area coverage using modified logistic map and a modulo tactic
No full textThis paper addresses the problem of chaotic path planning for the case of an autonomous mobile robot or an autonomous unmanned arial vehicle (UAV) moving in a 3D environment. The aim is to derive a method to generate a series of chaotic motion commands for a UAV that is tasked to explore a given 3D grid. The objective is to generate an unpredictable motion, that will also give good coverage results relative to the number of motions generated. This work adapts a combination of a modified logistic map and a modulo operator to generate the motion directions. An inverse pheromone memory approach is also considered to improve performance. Simulations are then performed to evaluate the performance of the method
Reachability of discrete time causal ARMA representations
No full textThe reachability subspace of discrete time causal ARMA representations is examined. First, the conditions under which a system is causal are studied and a formulafor the solution of a causal system is presented. Then, an important result regarding the set of admissible initial conditions is derived and the reachable subspace is provided
Wang, Xingtao(PRC-HIT): An algorithm of partial eigenstructure assignment for high-order systems. (English summary). Math. Methods Appl. Sci. 41 (2018), no. 16, 6070-6079.
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Lukasiewicz fuzzy set theory applied to SBE-algebras
No full textIn this paper, we utilize the Lukasiewicz t-norm to construct a novel class of fuzzy sets, termed ζ-Lukasiewicz fuzzy sets, derived from a given fuzzy framework. These sets are then applied to the structure of Sheffer stroke BE-algebras (SBE-algebras). We introduce and examine the concepts of ζ-Lukasiewicz fuzzy SBE-subalgebras and ζ-Lukasiewicz fuzzy SBE-ideals, with a focus on their algebraic properties. Furthermore, we define three specific types of subsets, referred to as ∈-sets, q-sets, and O-sets, and investigate the necessary conditions for these subsets to constitute subalgebras or ideals within the SBE-algebraic context