Shewhart control charts are suitable for stable but repetitive production processes used for the subsequent identification of random deviations while indicating breached quality limits. They provide information on process variability and, at the same time, make it possible to obtain information on the reliability of monitored processes. The objective of this paper is to assess the quality characteristics of plastic mouldings for the needs of the automotive industry with the application of the control charts method, specifically Shewhart control charts. The Shewhart control charts were applied to evaluate the quality characteristics, or, more specifically, to evaluate the measured width and length of the produced plastic mouldings by statistical analysis. Statistical analyses show that the set parameters are not met in the first two days of the test series. An improvement in the process is observed on the last day of the test series. The process is well set, as confirmed by our verification of the stability of the process. An important condition for setting the control charts is to observe the correct chronological arrangement and regular acquisition of measured values. Solving tasks in the future must be oriented to an evaluation of the capability of the production process of the monitored product. The proposal for future research will be oriented toward the evaluation of this capability via process capability indices that derive continuous data by using the classical method.

The aim of this article is to provide analysis and description of deposit and recycling system of disposable beverage packaging, which started in the Slovak Republic in 2022. The article provides the review of relevant literature with a focus on circular economy and Deposit Refund System (DRS), where analysis of refund systems was performed for this work. The proposed model involving reverse logistics describes how such deposit and collection system can work in practice, highlighting potential disadvantages, mainly the high investment costs. Therefore, the article also includes a financial analysis exploring potential cost of establishing said deposit and collection system. The number of necessary collection point for Slovakia has been determined and the total investment costs for the vending machines installations and service in Slovakia has been calculated.

Intersections in cities are important transport hubs, where traffic flows from all roads meet, connect, disconnect or intersect. This research is dedicated to the creation of simulation models of intersections and is based on real observations of two crossroads in a city. The principle is based on observing traffic flows using real traffic counting at peak times. The aim is to reduce traffic congestion by adjusting signal plans on the monitored section using computer simulation and modelling in ExtendSim8 software, which is a universal tool allowing the user to simulate any system or process by creating a logical representation in an easy-to-use format. According to our preliminary literature research, the ExtendSim software has never before been used before to create an intersection simulation to optimize the signal plan. There are several specialized software products for simulating traffic and intersections, but not everyone has access to these, or else they require lengthy user training. Therefore, it is very advantageous to use a universal simulation tool that is not used for traffic simulation at intersections in the city. The article points out that a universal simulation program such as ExtendSim can also be used in the design or assessment of signal plans at intersections.

This article describes a methodical framework that combines two specific methods of Lean management, namely the ABC method and the MRP planning method. The article further argues that combining the ABC inventory method with subsequent MRP planning is beneficial if the combination is implemented in practice. To demonstrate the benefits, the framework is tested using a case study company. The presented case-study problem is to reduce the number of changeover downtimes in the environment of an engineering production company. The researched company deals with the problem of setting up production lines in a way to minimize the number of downtimes within one work shift. Within the solution, four possible variants of the production plan are presented. By combining the ABC and MRP methods, up to four changeovers can be saved, which in financial terms represents a saving of about EUR 450,000 per year.

The principal objective of the research was to determine the influence exerted by the implementation of standard quality management systems on the improvement of selected logistics processes in small and medium-sized enterprises, which operate in the textile industry. Empirical research was carried out by the authors in the year 2017 on a group of small and medium-sized enterprises that operate in the textile industry in Poland and Slovakia. The research involved 33 organizations (20 Polish, and 13 Slovak ones). The research process and the analysis of the acquired results made it possible to address the research questions posed and to state, among others, that standardized quality management systems exert a relatively large influence on perfecting selected subsystems and logistic processes in the researched organizations.

This article deals with research on the impact of waste incineration processes on the environment within a particular region by means of computer simulation and logistics principles. The area of interest for this case study considers the aspects of the practical application of using the above methods and principles in order to reduce the environmental impacts of the waste incineration process in the Slovak Republic. At the initial stage of simulation model design, it is necessary to establish a formalized scheme, which is the basis for creating the actual simulation model. Then in the next stage the simulation model is created by combining building blocks within the given simulation software. The simulation results show that incineration during a one-year period produces about 15,266 tons of plastic and electrical components, and will release about 590,000 GJ of energy and about 199,000 tons of steam and 287 tons of other emissions with only 3 milligrams of dioxins. The computer simulation method is used to analyse, and subsequently adjust and improve the waste incineration process in order to achieve the desired parameter values – specifically the amount of heat produced, and the amount of generated steam and air pollutants.