http://hdl.handle.net/20.500.14044/38836 2026-07-26T00:43:49Z http://hdl.handle.net/20.500.14044/38901 Pneumatic Piston Control Modelling and Optimization Szakács, Tamás Piston control can be used for position, speed, acceleration, and force control. The main difference between pneumatic, and hydraulic cylinders is that the hydraulic control uses fluid instead of gas, and fluids are practically incompressible. Therefore, hydraulic cylinders can be more accurately controlled for position and speed. Pneumatic cylinders are showing greater dependence on external loads. Pneumatic systems in the contrary are simpler as construction, cheaper than hydraulic ones, and more wide-spread in laboratories and shops, but usually they are used for end-to end motions without exact position control. This paper introduces a pneumatic piston control that decreases the drawbacks of the position control of pneumatic cylinders, making it allow for simple application. 2023-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/38900 Fighting Insider Threats, with Zero-Trust in Microservice-based, Smart Grid OT Systems Stanojevic, Marina; Capko, Darko; Lendak, Imre; Stoja, Sebastijan; Jelacic, Bojan The Operational technology (OT) systems, utilized in critical infrastructure systems, can largely benefit from microservice-based control center architectures, by lowering upfront investment and maintenance costs. Many system operators are cautious and do not choose such modern system architectures, citing cybersecurity as a major concern. We intend to tackle that challenge and, in this paper, we investigate the threats to such mission critical systems and propose mitigation strategies aimed at lowering the likelihood of cyber-attacks. We developed a threat model focused on both external and insider threats and we group them. We utilize Microsoft’s STRIDE methodology to analyze the threats on a per-service level, in a specific use case, in the smart grid sector. We propose mitigations for each threat, by putting the zero-trust principle, at the core of our proposal. We calculate the resulting risks, for each threat, based on impact and likelihood, and show that it is significantly reduced when all proposed measures are applied. 2023-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/38898 Quality Improvement in Education, based on Student Feedback Farkas, Gabriella; Ancza, Erzsébet; Tóth, Georgina Nóra This work deals with the improvement of higher education processes and the identification of solution guidelines, for problem areas analyzed from student feedback. The purpose of this article is to analyze and evaluate student opinions and suggestions. To this end, on the one hand, we conducted an online survey, with the aim of collecting educational improvement proposals, from the student’s perspective. On the other hand, we investigated the applicability of this method, which is well known and effectively used in the field of social science. Using the method, we examined what student expectations can be formulated, in order to improve and develop the quality of education. In the course of factor analysis, we planned to define those expectations and attitudes that will be of effective help, in the successful improvement and development of the teaching work, which can ultimately mean long-term success for the student. 2023-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/38897 On the Use of Quaternions, in the Translated Reference Frame Formalism Pozna, Claudiu; Precup, Radu-Emil The approaches dedicated to the geometric model of the object, in the object- oriented modeling framework, specific to robots, are focused on the computation of the position of the elements, relative to a global reference frame. One important problem, in this regard, is the direct geometry, which starts with the initial data represented by the generalized coordinates and parameters of each element (in its own reference frame) and calculates the configuration of the structure in the global reference frame. This paper extends the Authors’ geometrical modeling approach, referred to as the translated reference frame formalism, by changing the mathematical apparatus of homogeneous transformations with that specific to quaternions. This new approach has three main advantages over the state-of-the art, namely, it simplifies substantially the configuration modeling, the transformation parameters are intuitive, and the computation is substituted with the operation of choosing a suitable transformation that belongs to a set of six homogeneous transformations. The suggested approach is validated by the computation of the geometric models of two illustrative robotic examples. The source codes are available in a public repository. 2023-01-01T00:00:00Z