Dynamic Models for Coordinating Private and Public Interests in Economic Corruption

Journal of Computer and Systems Sciences International - Dynamic game-theoretic models of fighting against the corrupt behavior of subjects in the models for coordinating private and public...     

Use of Intel SGX to ensure the confidentiality of data of cloud users

In this article the problem of possible attacks on confidentiality of user data in cloud systems comes from cloud provider’s side has been investigated. A secure cloud computing system architecture based on Intel Software Guard Extensions technology has been proposed. The approach that provides confidentiality of data of users of cloud systems is given. A method for implementing this approach into existing cloud systems is presented.     

Properties of Dense Assemblies of Magnetic Nanoparticles Promising for Application in Biomedicine

Chemically synthesized iron oxide nanoparticles and magnetosomes produced by magnetotactic bacteria are of great importance for application in biomedicine. In this paper, we discuss the complicated magnetic anisotropy of the nanoparticles, the influence of the magnetostatic interactions, and thermal fluctuations on the behavior of these assemblies. Numerical simulation for dilute assemblies of iron oxide nanoparticles with combined magnetic anisotropy show that the uniaxial shape anisotropy dominates even for small aspect ratios of the particle, L/D≥1.1–1.2. The quasistatic hysteresis loops are calculated for various clusters of bacterial magnetosomes with diameters D=40–60 nm to understand the influence of magnetostatic interactions. The specific absorption rate (SAR) is calculated for assemblies of magnetic nanoparticles dispersed in solid and liquid media. A new electrodynamic method of measurement is used to obtain the SAR of the assembly of bacterial magnetosomes with average diameter D=48 nm.     

Solution algorithms for differential models of hierarchical control systems

This paper studies a three-level control system. Impulsion serves as hierarchical control at the two levels of the system. We analyze the behavior of the system in the case of informational rules defined by the Germeier games Γ_1t and Γ_2t. Equilibrium design algorithms are proposed. The solution of the three-level differential model is reduced to the exploration of an equivalent multistep-differential model.     

Elastohydrodynamic problem for journal sliding bearing under reciprocating motion

A plane elastohydrodynamic problem for a radial sliding bearing with a thin liner under reciprocating motion under a constant load is considered. It has been shown that at the moment of time when the velocity becomes equal to zero the thickness of the lubricating film exceeds zero and that it continues to decrease during a period of time after changing the direction of rotation of the shaft. Film thickness and pressure distributions at various moments in time, as well as time dependences of the eccentricity and the minimum film thickness along the spatial coordinate, are presented for various values of the dimensionless parameter, which depends on the period of reciprocating motion. It has been shown that the smallest value of film thickness over the entire period of reciprocating motion increases with shortening period of reciprocating motion.     

Experimental investigation of the impulse gas injection into liquid and the use of experimental data for verification of the HYDRA-IBRAE/LM thermohydraulic code

Experiments with impulse gas injection into model coolants, such as water or the Rose alloy, performed at the Novosibirsk Branch of the Nuclear Safety Institute, Russian Academy of Sciences, are described. The test facility and the experimental conditions are presented in details. The dependence of coolant pressure on the injected gas flow and the time of injection was determined. The purpose of these experiments was to verify the physical models of thermohydraulic codes for calculation of the processes that could occur during the rupture of tubes of a steam generator with heavy liquid metal coolant or during fuel rod failure in water-cooled reactors. The experimental results were used for verification of the HYDRA-IBRAE/LM system thermohydraulic code developed at the Nuclear Safety Institute, Russian Academy of Sciences. The models of gas bubble transportation in a vertical channel that are used in the code are described in detail. A two-phase flow pattern diagram and correlations for prediction of friction of bubbles and slugs as they float up in a vertical channel and of two-phase flow friction factor are presented. Based on the results of simulation of these experiments using the HYDRA-IBRAE/LM code, the arithmetic mean error in predicted pressures was calculated, and the predictions were analyzed considering the uncertainty in the input data, geometry of the test facility, and the error of the empirical correlation. The analysis revealed major factors having a considerable effect on the predictions. The recommendations are given on updating of the experimental results and improvement of the models used in the thermohydraulic code.     

Equilibria in models of hierarchically organized dynamical control systems with regard to sustainable development conditions

We study dynamic game theoretic models for two- and three-level control systems taking into account sustainable development conditions. We consider methods of compulsion and impulsion as hierarchical control methods. We give definitions of equilibria and show algorithms for constructing them in various cases.     

Vertical coalitions in hierarchical three-level control systems of fan-like structure

By the example of a river-water quality control system, we consider different types of coalitions in hierarchical systems of fan-like structure for three-level control. We use the method of incentives as a control method. Algorithms for constructing equilibriums and a number of typical examples are presented. Conclusions on the benefits and shortcomings of different types of vertical coalitions are made.     

Three-level control systems for ecological-economic objects with fan structure

Mathematical formalization of control systems for ecological-economic objects with fan-type organizational structure is suggested. These systems are considered using three-level model of superficial water quality control systems as the corresponding example. The methods of compulsion and impetus are involved as the ones of hierarchical control. A certain algorithm to evaluate the solution is developed; some natural examples are provided and the obtained results are analyzed.