Enformatik Bilim Dalı Yayın Koleksiyonu

Analysis and mathematical computation of some dynamic functions for the guanidine zinc sulfate

2024-02-28T12:20:39Z

Analysis and mathematical computation of some dynamic functions for the guanidine zinc sulfate Aşkun, A.R.; Kiraci, A. A power-law formula with a critical exponent (Formula presented.) was used to analyze the anomalous behavior of the specific heat for guanidine zinc sulfate (GZS) crystal close to the phase transition temperature of TC = 178.4 K. The obtained values of 0.13 and 0.14 for (Formula presented.) below (T < TC) and above (T > TC) the phase transition temperature, respectively, were almost the same value of 0.13 (1/8) that predicted from the 3-D Ising model. Also, the internal energy (Formula presented.) the entropy (Formula presented.) and the free energy (Formula presented.) of this crystal were calculated as a function of temperature close to the phase transition temperature of TC = 178.4 K.

Spam mail filtering using Bayesian classifier and heuristics

2023-02-23T12:10:43Z

Spam mail filtering using Bayesian classifier and heuristics Eş, Sinan; Aşkun, Ali Riza; Hassanpour, Reza Commercials and virus infected files transferred by electronic mails (e-mail) have been a main source of time and resource loss during the past decade and email filtering as a binary text classification problem has attracted the attention of many researchers recently. In this study, we have tried to find a filtering solution which is able to automatically classify emails into spam and legitimate categories. In order to automatically and efficiently classify emails as spam or legitimate we took advantage of some Bayesian stochastic algorithms and machine learning based heuristic methods. Our approach includes some novel ideas from Information Retrieval.

Analysis and mathematical computation of some dynamic function for strontium stannate

2023-02-14T08:00:13Z

Analysis and mathematical computation of some dynamic function for strontium stannate Aşkun, Ali Rıza The frequency and full width at half maximum (FWHM) data of the Ag Raman modes (95.4, 231.4 and 263.2 cm−1) in strontium stannate crystal have been analyzed using the Balkanski model and the fitting parameters were determined. Also, the isobaric Grüneisen parameter of Ag Raman modes studied here was computed below the room temperature. This computation was performed from the unit cell volume and the observed frequency data of this crystal. Finally, values of the activation energy were extracted close to the structural phase transition temperatures of 160 and 265 K using the observed FWHM data of strontium stannate.