Pawel Majdzik

Bio: Pawel Majdzik is an academic researcher from University of Zielona Góra. The author has contributed to research in topics: Model predictive control & Fault tolerance. The author has an hindex of 9, co-authored 25 publications receiving 280 citations. Previous affiliations of Pawel Majdzik include Cora & Koszalin University of Technology.

The Performance Evaluation Tool for Automated Prototyping of Concurrent Cyclic Processes

Abstract: This paper is addressing an issue of distributed systems designing aimed at automated prototyping of Cyclic Concurrent Processes Systems. In such systems concurrent processes compete for access to shared system resources. In order to ensure that a system is deadlock and starvation-free, certain conditions must be satisfied. In this paper, these conditions guarantee that for a given pair (an initial state, a set of dispatching rules) the system - belonging to a specific class - has a steady cyclic state. However, system designers are interested in values of performance indices, such as a rate of resources or processes utilization or the period of the system cycle. Nowadays, the values of performance indices are provided mainly as a result of a simulation process, which requires much more processor power than in case of an analytical method. Thus, in this paper the authors focus on providing a procedure that enables building analytical models of Cyclic Concurrent Processes Systems belonging to a system class considered in the paper. To reach this aim the max-plus algebra formalism is employed. Both the conditions ensuring a cyclic process flow and steps of the procedure are the basis of a software tool, which can be used by designers to prototype systems of desired values of the performance indices. Thanks to the computer program the designers receive a useful tool that helps to validate and allocate distributed control procedures, even in a complex system, which is a composition of simpler systems. The procedure together with the software tool is the main outcome of this paper.

Towards Robust Predictive Fault-Tolerant Control For A Battery Assembly System

Abstract: The paper deals with the modeling and fault-tolerant control of a real battery assembly system which is under implementation at the RAFI GmbH company one of the leading electronic manufacturing service providers in Germany. To model and control the battery assembly system, a unified max-plus algebra and model predictive control framework is introduced. Subsequently, the control strategy is enhanced with fault-tolerance features that increase the overall performance of the production system being considered. In particular, it enables tolerating up to some degree mobile robot, processing and transportation faults. The paper discusses also robustness issues, which are inevitable in real production systems. As a result, a novel robust predictive fault-tolerant strategy is developed that is applied to the battery assembly system. The last part of the paper shows illustrative examples, which clearly exhibit the performance of the proposed approach.

Multi Criteria Decision Making

Abstract: Multi Criteria Decision Making (MCDM) is one of the technique which is used to select most optimal alternative with respect to multiple criteria for a specific goal. The method provides objectivity and compares the alternative relatively to estimate the priority value of the alternatives. Based on the priority value the optimal alternative is identified and selected as the option which can achieves the decision objective.

The Performance Evaluation Tool for Automated Prototyping of Concurrent Cyclic Processes

Abstract: This paper is addressing an issue of distributed systems designing aimed at automated prototyping of Cyclic Concurrent Processes Systems. In such systems concurrent processes compete for access to shared system resources. In order to ensure that a system is deadlock and starvation-free, certain conditions must be satisfied. In this paper, these conditions guarantee that for a given pair (an initial state, a set of dispatching rules) the system - belonging to a specific class - has a steady cyclic state. However, system designers are interested in values of performance indices, such as a rate of resources or processes utilization or the period of the system cycle. Nowadays, the values of performance indices are provided mainly as a result of a simulation process, which requires much more processor power than in case of an analytical method. Thus, in this paper the authors focus on providing a procedure that enables building analytical models of Cyclic Concurrent Processes Systems belonging to a system class considered in the paper. To reach this aim the max-plus algebra formalism is employed. Both the conditions ensuring a cyclic process flow and steps of the procedure are the basis of a software tool, which can be used by designers to prototype systems of desired values of the performance indices. Thanks to the computer program the designers receive a useful tool that helps to validate and allocate distributed control procedures, even in a complex system, which is a composition of simpler systems. The procedure together with the software tool is the main outcome of this paper.

Towards Robust Predictive Fault-Tolerant Control For A Battery Assembly System

Abstract: The paper deals with the modeling and fault-tolerant control of a real battery assembly system which is under implementation at the RAFI GmbH company one of the leading electronic manufacturing service providers in Germany. To model and control the battery assembly system, a unified max-plus algebra and model predictive control framework is introduced. Subsequently, the control strategy is enhanced with fault-tolerance features that increase the overall performance of the production system being considered. In particular, it enables tolerating up to some degree mobile robot, processing and transportation faults. The paper discusses also robustness issues, which are inevitable in real production systems. As a result, a novel robust predictive fault-tolerant strategy is developed that is applied to the battery assembly system. The last part of the paper shows illustrative examples, which clearly exhibit the performance of the proposed approach.