Pressure vessels that are exposed to high stresses, due to unfavorable working conditions during exploitation, must be properly designed, taking into account all calculation factors, in order to be safe during their expected lifetime. Checking the condition of the vessel, or analyzing the load of the vessel in working and test conditions, is mandatory. In recent times, numerical analysis represents one of the most important methods of analyzing the stress states of all structural elements, including pressure vessels. It enables precise determination of the location of the greatest stresses and deformations. In this paper, a stress analysis of a vertical cylindrical pressure vessel type VS 110 with a spiral for heating and cooling, with a volume of 3750 liters and a working pressure of 3 bars, which is used for the preparation of medicines in the pharmaceutical
industry, was performed. The calculation of the vessel was made according to the EN 13445 standard and regulations on pressure vessels. Then a numerical stress analysis was performed in the Autodesk Inventor 2023 software package. The results of the numerical analysis show that the highest stresses occur in the torispherical parts of the vessel end. Furthermore, the cylindrical nozzles on the shell as well as on the torispherical ends act as a reinforcement of the vessel because there is a stress reduction in their vicinity.

An overview of previous research provides a fundamental understanding of the current state of the process of cutting styrofoam on a CNC cutter, identifying gaps and the need for further research. Identification of important parameters, such as wire cutting speed, density of the styrofoam and current intensity, provide the basis for planning the experiment. The research methodology is described in detail, including the selection of
factors, levels, and design of experiment (Box-Behnken design). The analysis of the data obtained by the experiment is focused on the output sizes 𝑦𝑦1 (external measure) and 𝑦𝑦2 (internal measure), with an emphasis on statistical analysis using Minitab and Microsoft Excel software. Through a comprehensive review, the paper aims to contribute to the understanding and optimization of the process of cutting styrofoam on a CNC cutter,
providing insights into the influence of parameters on the quality of cutting.

The rapid development of technology caused many business processes to start using electronic processing of data, what implied development of local networks in many companies and organizations. Most network infrastructures have been developed incrementally, and expanded according to the needs, and mostly an ad-hoc approach was applied, without a lot of planning and taking care of security. Network implementers, in general, were no professionals, so the network issues and security risks happen often. Many pieces of today's network infrastructure have obsolete network equipment, with configured protocols that have become insecure, and physical implementation of the network is often a big collision domain. This paper will present approach, i.e., how a quality network infrastructure can be created and what are the key steps in identifying the weak points of the network infrastructure.