uncertainty

The paper deals with the methods for defining the composition of the coal mixture burnt in boilers at combined heat and power plants. Indirect methods for defining the proportions of the two grades of coal in the mixture based on the available information on the quality characteristics of the coal are proposed. According to the first method the coal mixture composition is determined based on the values of volatile substances content in the combustible mass of the coal mixture and of each grade of coal making up the mixture.

It is proposed and studied the model of conflict interaction of objects and subjects of cyberspace based on the principles of construction discretionary access control models in information and telecommunication systems. The model can provide information security system in the form of Euclidean product of sets, which components are elements of information security. Cyberspace is defined as the Euclidean metric.