Justification for the Use of Cohen’s Kappa Statistic in Experimental Studies of NLP and Text Mining

Modern metrics for evaluating agreement coefficients between the experimental results and expert opinion are compared, and the possibility of using these metrics in experimental research in automatic text processing by machine learning methods is assessed. The choice of Cohen’s kappa coefficient as a measure of expert opinion agreement in the NLP and Text Mining problems is justified. An example of using Cohen’s kappa coefficient for evaluating the level of agreement between the opinion of an expert and the results of ML classification and the measure of agreement of expert opinions in the alignment of sentences of the Kazakh-Russian parallel corpus is given. Based on this analysis, it is proved that Cohen’s kappa coefficient is one of the best statistical methods for determining the level of agreement in experimental studies due to its ease of use, computing simplicity, and high accuracy of the results.

     

Adhesion of poly(m-, p-phenylene isophtalamide) coatings to metal substrates

The adhesive properties of wear-resistant poly(m-, p-phenylene isophtalamide) coatings to substrates of ferrous and non-ferrous metal materials which are the most common in mechanical engineering were investigated experimentally. The results of measurements of adhesive characteristics taken with the help of such methods as a cross cutting test, a quantitative peel test, a lap shear strength test, a contact angle test and a spreading radius test are discussed in terms of the three most common mechanisms of adhesion: mechanical coupling, molecular bonding, and thermodynamic adhesion. It was established that the adhesive properties of poly(m-, p-phenylene isophtalamide) coatings depend on the content of a ferrite component in the structure of carbon steel substrates.     

Structure and Properties of Ionic-Plasma WC Coatings

Materials Science - We develop a technology for the formation of coatings based on spraying of various target cathodes made of pure tungsten and bronze. To check the technology, we formed WC...     

The hemostatic system and thrombohemorrhagic complications during the hemosorption treatment of patients with chronic glomerulonephritis with nephrotic syndrome

Effects were studied of hemosorption on the system of homeostasis in patients with chronic glomerulonephritis presenting with nephrotic syndrome. An optimum graphic express method of control of the homeostasis system state was found, permitting predicting thrombohemorrhagic complications after single-session hemosorption (significance 99.9%). Strategies were identified for correction of changes in coagulogrammes in such patients along with devising measures to prevent the above complications.