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Domestic Sources of Russia's Resurgence as a Global Great Power
Tassos E,Fakiolas,Efstathios T,Fakioas 서울대학교 국제학연구소 2009 Journal of International and Area Studies Vol.16 No.2
with the dissolution of the Soviet Union, Russia being its legitimate heir lost most of its greatness. In recent years, coincided as they have been with Vladimir Putin holding office, Russia appears to have been on the way to recover and reemerge as a first tier great power in world politics. Holding constant the shaping influence of the international system and geopolitics, this development also owes much to the legacy of Czarism, the Soviet Union and Putin's two-term presidency.
( Tassos G. Anastasatos ),( Ian R. Davidson ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2006 Journal of Economic Integration Vol.21 No.3
This article provides a general and robust empirical examination of speculative pressure on various exchange rate regimes using an unusually large panel of monthly data for developed countries, analysed within the framework of Limited-Dependent Variable (LDV) models with various innovations and extensions. In comparison to studies with lower frequency data, significant differences are found in linking crises with macroeconomic, financial and political fundamentals, despite the noise increasing tendency of higher frequency data. Considerable heterogeneity in the events surrounding crises is documented, rendering globally applicable rules for prediction and prevention inappropriate. The findings are robust to different specifications but the definition of a crisis has a bearing on its predictability.
Domestic Sources of Russia’s Resurgence as a Global Great Power
Tassos E. Fakiolas,Efstathios T. Fakiolas 서울대학교 국제학연구소 2009 Journal of International and Area Studies Vol.16 No.2
With the dissolution of the Soviet Union, Russia being its legitimate heir lost most of its greatness. In recent years, coincided as they have been with Vladimir Putin holding office, Russia appears to have been on the way to recover and reemerge as a first tier great power in world politics. Holding constant the shaping influence of the international system and geopolitics, this development also owes much to the legacy of Czarism, the Soviet Union and Putin’s two-term presidency.
Kominis, Yannis,Bountis, Tassos,Flach, Sergej American Physical Society 2017 Physical Review A Vol.95 No.6
<P>We analyze the stability of a non-Hermitian coupler with respect to modulational inhomogeneous perturbations in the presence of unbalanced gain and loss. At the parity-time (PT) symmetry point the coupler is unstable. Suitable symmetry breakings lead to an asymmetric coupler, which hosts nonlinear supermodes. A subset of these broken symmetry cases finally yields nonlinear supermodes which are stable against modulational perturbations. The lack of symmetry requirements is expected to facilitate experimental implementations and relevant photonics applications.</P>
Space control and global hegemony
Efstathios T Fakiolasa,Tassos E Fakiolas 한국국방연구원 2009 The Korean Journal of Defense Analysis Vol.21 No.2
This article argues that in addition to ideology and an ensuing discourse, one-if not the only*effective grand strategic means for a great power to establish global hegemony is through space control. Today, the sole power with both the will and the capability to achieve the grand strategic end of hegemony is the United States, which spends nearly as much on space and armaments as all other countries combined. However, time is not on the side of the United States. Unless it proves able to secure control of space in the coming few years, the European Union and Russia will hardly consent to U.S. domination of space*and through it world politics. Thus, military space control is not the only way ahead.
Antonopoulos, Chris G.,Skokos, Charalampos,Bountis, Tassos,Flach, Sergej Elsevier 2017 Chaos, solitons, and fractals Vol.104 No.-
<P><B>Abstract</B></P> <P>In the study of subdiffusive wave-packet spreading in disordered Klein–Gordon (KG) nonlinear lattices, a central open question is whether the motion continues to be chaotic despite decreasing densities, or tends to become quasi-periodic as nonlinear terms become negligible. In a recent study of such KG particle chains with quartic (4th order) anharmonicity in the on-site potential it was shown that q − Gaussian probability distribution functions of sums of position observables with <I>q</I> > 1 always approach pure Gaussians ( q = 1 ) in the long time limit and hence the motion of the full system is ultimately “strongly chaotic”. In the present paper, we show that these results continue to hold even when a sextic (6th order) term is gradually added to the potential and ultimately prevails over the 4th order anharmonicity, despite expectations that the dynamics is more “regular”, at least in the regime of small oscillations. Analyzing this system in the subdiffusive energy domain using <I>q</I>-statistics, we demonstrate that groups of oscillators centered around the initially excited one (as well as the full chain) possess strongly chaotic dynamics and are thus far from any quasi-periodic torus, for times as long as t = <SUP> 10 9 </SUP> .</P> <P><B>Highlights</B></P> <P> <UL> <LI> We contribute to the debate concerning the asymptotic behavior of wavepacket spreading in nonlinear, disordered lattices, which is an issue of interest in the last years. </LI> <LI> Using numerical techniques of chaos theory (computations of Lyapunov exponents) and statistical physics (q-statistics, Tsallis entropy) we provide, for a set of Klein–Gordon disordered lattices with higher than 4th order nonlinearity in their on-site potential, strong numerical evidences that wave packet spreading remains strongly chaotic for very long times. </LI> <LI> Our findings clearly suggest that the overall motion in the considered systems does not approach the quasi-periodic regime of invariant tori as conjectured by some authors. </LI> </UL> </P>
Rheological study of hyaluronic acid derivatives
Michael Chernos,Dana Grecov,Ezra Kwok,Siziwe Bebe,Oladunni Babsola,Tassos Anastassiades 대한의용생체공학회 2017 Biomedical Engineering Letters (BMEL) Vol.7 No.1
The viscoelastic properties of four novel, lowmolecular weight hyaluronic acid derivatives were investigatedand compared to the parent hyaluronic acid compound. Briefly, all derivatives were synthesized by firstdeacetylating the parent hyaluronic acid. One sample wasleft as such, while two others were reacytelated. The finalcompound, of particular interest for its anti-inflammatoryproperties, was butyrylated. The compounds were dissolvedin phosphate buffer solution (PBS) and studied at aconcentration of 5 mg/mL. Shear thinning behaviour wasobserved for all compounds, however, derivative sampleshad a lower viscosity than the parent compound at highshear rates. Viscoelastic properties were also observed todecrease as a result of the derivative preparation method. Itis believed that these changes are primarily caused by adecrease in hyaluronic acid molecular weight. Byincreasing the concentration of the anti-inflammatorycompound, it may be possible to modulate the viscoelasticproperties to more closely resemble those of commercialviscosupplements. As a result, an anti-inflammatoryderivative of hyaluronic acid may potentially improve uponexisting viscosupplements used to treat patients who aresusceptible to flare up.