On the Application of Genetic Algorithms to Differential Equations

Genetic algorithms can be used in order to solve optimization problems. Such a technique may be used in order to solve differential equations.differential equations; genetic algorithms;

On the Implementation and Use of a Genetic Algorithm with Genetic Acquisitions

A genetic algorithm is convergent when genetic mutations occur on the objective function gradient direction. These genetic mutations are called genetic acquisitions (Mateescu, 2005). We improved the algorithm and its implementation by using the characteristics of parents in order to generate new individuals. Finally, we applied the genetic algorithm in order to find the parameters of a Cobb-Douglas function.evolutionary algorithms, optimization

Polynomial Interpolation and Applications to Autoregressive Models

Polynomial interpolation can be used to approximate functions and their derivatives. Some autoregressive models can be stated by using polynomial interpolation and function approximation.polynomial interpolation; autoregressive models;

X-ray photoelectron spectroscopy study of nickel and nickel-base alloy surface alterations in simulated hot corrosion conditions with emphasis on eventual application to turbine blade corrosion

Research on the high temperature oxidation and Na2SO4 induced hot corrosion of some nickel base superalloys was accomplished by using ESCA to determine the surface composition of the oxidized or corroded samples. Oxidation was carried out at 900 or 1000 C in slowly flowing O2 for samples of B-1900, NASA-TRW VIA, 713C, and IN-738. Oxidation times ranged from 0.5 to 100 hr. Hot corrosion of B-1900 was induced applying a coating of Na2SO4 to peroxidized samples, the heating to 900 C in slowly flowing O2. For oxidized samples, the predominant type of scale formed by each superalloy was determined, and a marked surface enrichment of Ti was found in each case. For corroded samples, the transfer of significant amounts of material from the oxide layer to the surface of the salt layer was observed to occur long before the onset of accelerating weight-gain. Changes in surface composition were observed to coincide with the beginning of accelerating corrosion, the most striking of which was a tenfold decrease in the sulfur to sodium ration and an increase in the Cr(VI) ratio

Comment on ``Adsorption of Polyelectrolyte onto a Colloid of Opposite Charge''

In a recent Letter, Gurovitch and Sens studied the adsorption of a weakly charged polyelectrolyte chain onto an oppositely charged colloidal particle. By using a variational technique they found that the colloidal particle can adsorb a polymer of higher charge than its own, and thus be ``overcharged.'' I argue that the observed overcharging by a factor of 16/5 is indeed an artifact of the approximations involved in the study. Moreover, I show that the existence of overcharging depends crucially on the choice of the trial wave function, contrary to their claim.Comment: A comment on: E. Gurovitch and P. Sens, Phys. Rev. Lett. 82, 339 (1999

A Formal TLS Handshake Model in LNT

Testing of network services represents one of the biggest challenges in cyber security. Because new vulnerabilities are detected on a regular basis, more research is needed. These faults have their roots in the software development cycle or because of intrinsic leaks in the system specification. Conformance testing checks whether a system behaves according to its specification. Here model-based testing provides several methods for automated detection of shortcomings. The formal specification of a system behavior represents the starting point of the testing process. In this paper, a widely used cryptographic protocol is specified and tested for conformance with a test execution framework. The first empirical results are presented and discussed.Comment: In Proceedings MARS/VPT 2018, arXiv:1803.0866

The European Union, state of exception and state transformation - Romania, Turkey and ethnic minority politics

The dissertation argues that the modern national sovereignty is the political expression of modern subjectivity and it dominates as such the contemporary discourse of human life, ethnic minorities included, in world politics. The analytical mechanism is grounded in social constructivist theorisations of discourse analysis. It evaluates whether and to what extent the enlargement of the European Union (EU) and its accession conditionality affect the discursive mechanisms of the national, sovereign subjectivity and its relations with national minorities. The cases studied here have been chosen because of the two states being inscribed in the recent past (Romania) and currently (Turkey) in the enlargement process. The dissertation builds methodologically on Agamben’s understanding of sovereignty as state of exception, interpreted here originally qua exception from the temporality of human life and therefore apt to author political time. In national form, this is understood as the production of the national time of politics, with a double ontological consequence: it constitutes the political nation, while concomitantly and inherently excluding non-national human life from political possibilities. The method of research develops this methodological perspective to analyse national sovereignty, drawing also on Heidegger, as factualisation of two purely theoretical constructs: the nation and the principle of sovereignty