<p style="text-align: justify;">In the paper stress analysis of rotary kiln support rollers is conducted. Stress state in the support rollers is caused by temperature gradient, shrinkfit connection between shaft and roller and by the contact with kiln ring. The stress analysis is done analytically and numerically, and the results obtained are compared.</p>

This paper presents and analyzes the applicability of three linearization techniques used for solving multi-objective linear fractional programming problems using the goal programming method. The three linearization techniques are: (1) Taylor’s polyno-mial linearization approximation, (2) the method of variable change, and (3) a modification of the method of variable change proposed in [20]. All three linearization techniques are presented and analyzed in two variants: (a) using the optimal value of the objective functions as the decision makers’ aspirations, and (b) the decision makers’ aspirations are given by the decision makers. As the criteria for the analysis we use the efficiency of the obtained solutions and the difficulties the analyst comes upon in preparing the linearization models. To analyze the applicability of the linearization techniques incorporated in the linear goal programming method we use an example of a financial structure optimization problem.

The paper analyzes the memory usage and consumption of processor time when the user interacts with the application. We have analyzed the workload of the processor depending on the number of loaded data for different technologies of transfer (AMF, JSON or XML) from the server to the client. Apart from that, we have analyzed the occupation of memory depending on the number of loaded data and instantiated objects, the percentage of availability of memory that the class instances occupy. The change in the memory occupation is displayed graphically and numerically