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REFERENCES 1. Babitsky V. (2013), Theory of vibro-impact systems and applications , Springer Science & Business Media. 2. Bednarski Ł., Michalczyk J. (2017), Modelling of the working process of vibratory conveyors applied in the metallurgical industry, Archives of Metallurgy and Materials , 62(2), 721–728. 3. Belovodskiy V.N., Bukin S.L., Sukhorukov M.Y., Babakina A.A. (2015), 2:1 superharmonic resonance in two-masses vibrating machine, Journal of Vibration Engineering & Technologies , 3(2), 123–135. 4. Clough Ray W., Joseph Penzien. (1995), Dynamics


Over the last years, there has been a real revolution of mobile devices, which has effectively translated into the exponential increase in internet access rates on a mobile device as opposed to accessing it on desktop systems. Given the growing importance of smartphones, it is important to assess the privacy and security risks of these devices in order to mitigate them. However, as we know, in modern mobile security architecture, applications represent the most critical elements. In this paper we review common mobile applications flaws involving network communications, data storage, user input handling and also exploring a number of vulnerabilities. While applications provide amazing features and benefits for users, they also represent the main attraction for cyber criminals. In order to have a true picture of the mobile security threat spectrum, this article presents the means of how mobile applications can impact systems security, stability and compromise personal data if they are not handled properly.

(authorized translation from Russian by K.N. Trirogoff). Balskrishnan-Neustadt series. New York: Holt, Rinehart and Winston. Lee, E.B., & Markus, L. (1972). Foundations of Optimal Control Theory. Moscow: Nauka (in Russian). Lavendelis, E. (1970). Synthesis of optimal vibro-machines. Riga: Zinatne (in Russian). Lavendelis, E., & Viba, J. (1973). Individuality of Optimal Synthesis of Vibro-Impact Systems. In: Vibrotechnics. Kaunas. Vol. 3 (20). (in Russian). Viba, J. (1988). Optimization and synthesis of vibro-impact systems. Riga: Zinatne (in Russian). Lavendelis

–23. SUBACH, A. P. 1991. Dynamics of machines and processes of bulk vibration and centrifuging process of bulk details. Riga : Znanie, 1991, 400 pp. SUBACH, A. P. 1996. Forced vibrations of the vibro-impact system in an inelastic collision of the masses. On a problem of dynamics. Riga : Znanie, 1996, pp. 67–78.

Machinery Manufacture and Reliability , 4 , 26–34. 8. Astashev, V.K., & Krupenin, V.L. (1998). Waves in distributed and discrete vibroimpact systems and in strongly non-linear mediums. Journal of Machinery Manufacture and Reliability , 5 , 13–30. 9. Krupenin, V.L. (1998). Vibro-impact processes in systems with large number impact pairs and distributed impact elements. In Dynamics of Vibro-Impact Systems. Euromech Colloquium 386 , 15–18 September 1998. England: Loughborough University. 10. Babitsky, V.I., Krupenin, V.L., & Veprik, A.M. (1988). Vibroimpact phenomena due

-graph-based models of planetary gear . – Journal of Theoretical and Applied Mechanics, vol.48, No.2, pp.415-433. [25] Luo Y. and Tam D. (2011): Dynamics Modeling of Planetary gear set considering meshing stiffness based on bond graph . – Procedia Engineering, vol.24, pp.850-855. [26] Guo Y., Liu D., Yang S., Li X. and Chen J. (2016): Hydraulic-mechanical coupling modeling by bond graph for impact system of a high frequency rock drill drifter with sleeve distributor . – Automation in Construction, vol.63, pp.88-99. [27] Al-Shyyab A. and Kahraman A. (2005): Non-linear dynamic

Doctoral dissertation University degli Studi di Napoli Federico II 10.6092/UNINA/FEDOA/3029 [15] di Bernardo, M., Budd, C. J., Champneys, A. R.and Kowalczyk, (2007), Bifurcation and Chaos in Piecewise Smooth Dynamical Systems. Theory and Applications. Springer-Verlag,UK. 10.1007/978-1-84628-708-4 di Bernardo M. Budd C. J. Champneys A. R. Kowalczyk 2007 Bifurcation and Chaos in Piecewise Smooth Dynamical Systems Theory and Applications Springer-Verlag UK 10.1007/978-1-84628-708-4 [16] Cheng, J., & Xu, H. (2006). Nonlinear dynamic characteristics of a vibro-impact system

. Behavior of each system where the body collisions take place is different, and therefore, each of them must be investigated in an individual way. Because of the practical importance, a good deal of attention is focused on analysis of vibro-impact systems, where the vibrations are governed by the momentum transfer and mechanical energy dissipation through the body collisions. This is utilized for impact dampers applied to attenuate high-amplitude oscillations, such as those appearing in subharmonic, self-excited and chaotic vibrations. Problem of the body collisions is


of vibro-impacting systems embodied by some hybrid systems with impacts. Particularly, the motion of a material point and its impacts with the moving limiter are researched. Special consideration is given to periodic events such as one impact every period, one impact every multiple period and multiple impacts every one period of motion of the limiter. In all of these occurrences, the dynamic behaviour of the system and the stability of fixed points is investigated. Furthermore, specific instances of the chaotic motion are examined and reported for specific