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The purpose of this study is to develop a model of threats identification in the information security system of the mobile connection operator using the method of systemic dynamics. The model presented in the environment of imitation modeling Powersim Studio 7 allows assessing the impact of threats on assets, and as a result, on the overall financial condition of the mobile operator. When building the model, the business processes of the mobile operator and the type of corporate management were taken into account that provided the reflecting all information flows at different levels. The model also includes a set of technical and organizational measures of information protection, which reduce the possibility of the information security threats realization.

In order to improve the pricing of Russian coking coal, a method is proposed for calculating the relative technological value of purchased coking-coal batches. The basic idea is to compare the parameters of optimal coking batch and coking batch that includes the purchased coking-coal concentrate and other coals available to a particular buyer. It is shown that the relative technological value of a particular batch of coking-coal concentrate will depend on the parameters of the other coals included in the coking batch at a particular coke plant.

Fibronectin is an extracellular adhesive glycoprotein which can bind selectively with type II collagen, the main constituent of the interstitial tissue of the trabecular system of the human eye [8], it can increase resistance to the outflow of aqueous humor [4, 5], and can thus raise the intraocular pressure. Fibronectin is found in the drainage system of healthy adults [4]. It is not clear, however, whether the content of this protein changes with age. This is an important concept in connection with the sharp increase observed in the fibronectin content during progression of primary open-angle glaucoma [2].