Dominik Strzałka

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• Professor
• Professor (Associate) at Rzeszów University of Technology

Harmful Internet use (HIU) describes unintended use of the Internet. It could be both self-harm and harming others. Our research goal is to develop a more accurate method for measuring HIU by this novel peer assessment. As such, it may become, with our call for more research, a paradigm shift supplementing every rating scale or other type of Intern...

In multiple-criteria decision making/aiding/analysis (MCDM/MCDA) weights of criteria constitute a crucial input for finding an optimal solution (alternative). A large number of methods were proposed for criteria weights derivation including direct ranking, point allocation, pairwise comparisons, entropy method, standard deviation method, and so on....

A Monte Carlo study of the pairwise comparisons method has been designed to validate the accuracy improvement by the pairwise comparisons method for 3D objects. For this, not-so-irregular objects were randomly selected. It is important to emphasize that this study focuses on testing the accuracy of the method rather than the users’ skills. The user...

This study presents a comparative analysis of PLANS (v. /2019/12/10) and EA-PSM (v. 19.11.15.0) software for power system simulations, focusing on their applications in enhancing energy security and grid reliability. Utilizing the Newton–Raphson algorithm for power flow calculations, both tools offer robust solutions for network balance, addressing...

In the paper an example of an integrated Software-Defined Network (SDN) system with heterogeneous technological instances based on the Linux platform will be shown. For this purpose, two research testing stands with a POX controller and OVS (Open vSwitch) switches were used. In the first testing stand, the research based on the ICMP traffic was don...

This paper presents REDUCE, a free online tool designed to support decision-making processes by addressing inconsistency in multiplicative pairwise comparison (PC) matrices, a key element of many multi-criteria decision-making (MCDM) methods, including the analytic hierarchy process (AHP). AHP relies on pairwise comparisons to assign weights to dec...

In this paper we study a family of doubled and quadrupled Fibonacci type sequences obtained by distance generalization of Fibonacci sequence. In particular we obtain doubled Fibonacci sequence, doubled and quadrupled Padovan sequence and quadrupled Narayana’s sequence. We give a binomial direct formula for these sequences using graph methods, and a...

This paper propose two new generalizations of the logistic function, each drawing on non-extensive thermodynamics, the q-logistic equation and the logistic equation of arbitrary order respectively. It demonstrate the impact of chaos theory by integrating it with logistics equations and reveal how minor parameter variations will change system behavi...

In the era of the burgeoning metaverse, integration of payment systems is becoming a key element to enable seamless and secure transactions in virtual environments. This paper focuses on an analysis of current payment solutions in the metaverse, as well as their challenges and future prospects. The first part of the paper discusses existing payment...

The digital transformation has introduced several new business opportunities for companies, but also new risks. Cybersecurity is a great concern for companies today, especially for Small and Medium sized Enterprises (SMEs), which are more vulnerable. SMEs typically lack an internal IT department and their staff and management are not used to deal w...

The Best–Worst method (BWM) is one of the latest contributions to pairwise comparisons methods. As its name suggests, it is based on pairwise comparisons of all criteria (or possibly other objects, such as alternatives, sub-criteria, etc.) with respect to the best (most important) and the worst (least important) criterion. The main aim of this stud...

This paper introduces REDUCE, a Python module designed to minimize inconsistency in multiplicative pairwise comparisons (PC), a fundamental technique in Multi-Criteria Decision Making (MCDM). Pairwise comparisons are extensively used in various fields, including engineering science and numerical simulation methods, to compare different options base...

Harmful Internet use (HIU) is a term coined for the unintended use of the Internet. In this study, we propose a more accurate HIU measuring method based on the peer assessment and differential evolution approach. The sample data comprises a juvenile population in Poland; 267 subjects assessed 1,513 peers. In addition to classic statistical analysis...

The theoretical and practical aspects and results of simulations based on a specialized tool that is used in the energy industry were adressed. The previously discussed cases in the literature by taking into account the worst case and critical states of networks in terms of complex networks were extended. Using the Monte-Carlo method, the vulnerabi...

The analysis of the best turbine dependence on criteria weights with the Monte Carlo weights method.

Background Next Generation Sequencing (NGS) techniques dominate today’s landscape of genetics and genomics research. Though Illumina still dominates worldwide sequencing, Oxford Nanopore is one of the leading technologies currently being used by biologists, medics and geneticists across various applications. Oxford Nanopore is automated and relativ...

Areas of experience allow for the acquisition and consolidation of both existing knowledge and skills. These are significant factors in the training of staff members for companies in the Industry 4.0 area. One of the currently available modern tools used in the teaching process is virtual reality (VR) technology. This technology, due to its high le...

In this paper we introduce and study a new generalization of Fibonacci polynomials which generalize Fibonacci, Jacobsthal and Narayana numbers, simultaneously. We give a graph interpretation of these polynomials and we obtain a binomial formula for them. Moreover by modification of Pascal’s triangle, which has a symmetric structure, we obtain matri...

The process of mainframe machines managing and administration requires not only specialized expert knowledge based on many years of experience but also on appropriate tools provided by a machine performance management system, e.g. the Resource Measurement Facility (RMF). The aim of this paper is to show some preliminary results of Z-RAYS system con...

In Search of ML Theory - a presentation that refers to our paper with the same title.

Machine Learning (ML) and Artificial Intelligence (AI), in general, are based on search algorithms. In this paper, we use paradoxically the same search techniques again to look for the general theory of machine learning itself. In other words, we search for a unifying machine learning theory. For this purpose, we turn out for a help to the general...

A computational fluid dynamics method was used for prediction of flow behavior and band profiles of small- and macro-molecule compounds eluting in extra-column volumes (ECV) of an Äkta chromatographic system. The model compounds were: acetone, bovine serum albumin and an antibody. The construction of ECV was approximated by different types of geome...

The aim of the paper is to introduce REDUCE, a free online decision support tool for the reduction of inconsistency in multiplicative pairwise comparisons framework. Pairwise comparisons (PCs)constitute a popular technique for multiple-criteria decision-making, its purpose is to assign weights to compared entities, thus providing their ranking from...

Presentation of new free tool - REDUCE - available at: http://reduce.prz.edu.pl REDUCE is a free online decision support tool for the reduction of inconsistency in the multiplicative pairwise comparisons framework. Pairwise comparisons (PCs) constitute a popular technique for multiple-criteria decision making, its purpose is to assign weights to...

The aim of this paper is to compare selected iterative algorithms for inconsistency reduction in pairwise comparisons by Monte Carlo simulations. We perform simulations for pairwise comparison matrices of the order n = 4 and n = 8 with the initial inconsistency 0.10 < CR < 0.80 and entries drawn from Saaty’s fundamental scale. Subsequently, we eval...

In this presentation, we described the case study, which was conducted based on the real data obtained for German national elec-tricity grid. The analyzed network represents connections and high-voltage switchgears of 220 and 380 kV lines. Selected graph parameters – the average vertex degree, vertex degree distribution, network efficiency, the clu...

In this paper, a case study is conducted based on the real data obtained for Ger-man national electricity grid. The analyzed network represents connections and high-voltage switchgears of 220 and 380 kV lines. Selected graph parameters – the average vertex degree, vertex degree distribution, network efficiency, the clus-tering coefficient, the aver...

A case study based on the real data obtained from the Polish PSE System Operator of the highest voltages electrical energy network is shown. The data about the interconnection exchange and some complex networks (graphs) parameters were examined, after the removal of selected nodes. This allowed to test selected network parameters and to show that t...

The main goals of the project were: - to do several experiments with Oxford Nanopore sequencing, - to find some new mutants of the thermotolerant Bacillus subtlis strains, - to prepare a new serever NanoForms for pipeline bioinforamatic data analysis.

Pairwise comparisons constitute a popular and important tool for multiple-criteria decision making. Consistency is one particular aspect of pairwise comparisons that has been studied thoroughly in recent decades since human judgements are seldom fully consistent. The aim of this paper is to propose a new simple and intuitive iterative Step-by-Step...

Abstract We forecast 1,000,000 COVID-19 cases outside of China by March 31st, 2020 based on a heuristic and WHO situation reports. We do not model the COVID-19 pandemic; we model only the number of cases. The proposed heuristic is based on a simple observation that the plot of the given data is well approximated by an exponential curve. The expone...

We forecast 1,000,000 COVID-19 cases outside of China by March 31st, 2020 based on a heuristic and WHO situation reports. We do not model the COVID-19 pandemic; we model only the number of cases. The proposed heuristic is based on a simple observation that the plot of the given data is well approximated by an exponential curve. The exponential curv...

We forecast 1,000,000 COVID-19 cases outside of China by March 31st, 2020 based on a heuristic and WHO situation reports. We do not model the COVID-19 pandemic; we model only the number of cases. The proposed heuristic is based on a simple observation that the plot of the given data is well approximated by an exponential curve. The exponential curv...

This paper examines the constricted use of group theory in the studies of pairwise comparisons. The presented approach is based on the application of the famous Levi Theorems of 1942 and 1943 for orderable groups. The theoretical foundation for multiplicative (ratio) pairwise comparisons has been provided. Counterexamples have been provided to supp...

In this paper, a case study is conducted based on the real data obtained from the local Distribution System Operator (DSO) of electrical energy. The analyzed network represents connections and high-voltage switchgears of 110 kV. Selected graph parameters—vertex degree distribution, the average vertex degree, the graph density, network efficiency, t...

Compelling evidence against a heedless group theory generalization of pairwise comparisons elements is provided by means of counterexamples and mathematical reasoning. The lack of acceptable semantics for selected groups (with negative and complex numbers) and implications are analyzed. This study also provides examples and mathematical reasoning i...

Compelling evidence against a heedless group theory generalization of pairwise comparisons elements is provided by means of counter-examples and mathematical reasoning. The lack of acceptable semantics for selected groups (with negative and complex numbers) and implications are analyzed. This study also provides examples and mathematical reasoning...

Background: Using data collected by the Office for Civil Rights, Department of Health and Human Services (HHS), over half of the population in the USA might have been affected by security breaches since Oct 2009. This study provided analysis of the data, presenting the numbers of individuals affected in one breach and the number of breaches. Meth...

This study presents compelling social indicators of such magnitude that they cannot be ignored. The statistical evidence shows that data breaches of electronic health records have taken place at an unprecedented scale. Currently, the number of individuals affected, as regulations of Health Insurance Portability and Accountability Act refers to us,...

In this study, the software product quality measurement, based on the consistency-drive pairwise comparisons (PC) is proposed as a new way of approaching this complicated problem. The assessment of software quality (SQ) is a complex process. It is usually done by experts who use their knowledge and experience. Their subjective assessments certainly...

The article presents results of studies using simulations on computer network devices, designed to examine the effectiveness of routing protocols with the video streaming and generated traffic for Jperf applications. In order to demonstrate the effectiveness of the selected protocols several simulation scenarios were made using different sized UDP...

This presentation was given at the seminar in Military University of Technology (WAT) in Warsaw. It shows the results of research about the analysis of thermodynamic conditions and influence of spatio-temporal long-range dependencies on processing in computer systems.

In this paper we present some preliminary results in the field of computer systems management with relation to Tsallis thermostatistics and the ubiquitous problem of hardware limited resources. In the case of systems with non-deterministic behaviour, management of their resources is a key point that guarantees theirs acceptable performance and prop...

The problem of modelling different parts of computer systems requires accurate statistical tools. Cache memory systems is an inherent part of nowadays computer systems, where the memory hierarchical structure plays a key point role in behavior and performance of the whole system. In the case of Windows operating systems, cache memory is a place in...

Short presentation about possibilities that are given by Concluder tool

The aim of this paper is to present some preliminary results and non-extensive statistical properties of selected operating system counters related to hard drive behaviour. A number of experiments have been carried out in order to generate the workload and analyse the behaviour of computers during man–machine interaction. All analysed computers wer...

This presentation tries to convince you that computer systems are also complex systems. Probably some its readers won’t be convinced, but there are some interesting phenomena inside computer systems that are typical evidences of complex systems.

The notion system, in a wide range of disciplines from ecology to physics, social sciences and informatics, has received a significant attention in the last years. The behaviour of each system can be understood when the proper approach is taken. In the case of computer systems there is also a need to have a paradigm change in approach to their anal...

In this study, we provide mathematical and practice-driven justification for using [0, 1]normalization of inconsistency indicators in pairwise comparisons. The need for normalization, as well as problems with the lack of normalization, is presented. A new type of paradox of infinity is described

The problem of modeling different parts of computer systems requires accurate statistical tools. Cache memory systems is an inherent part of nowadays computer systems, where the memory hierarchical structure plays a key point role in behavior and performance of the whole system. In the case of Windows operating systems, cache memory is a place in m...

In this study, we provide mathematical and practice-driven justification for using [0, 1] normalization of inconsistency indicators in pairwise comparisons. The need for normalization, as well as problems with the lack of normalization, are presented. A new type of paradox of infinity is described.

In this study, we provide mathematical and practice-driven justification for using $[0,1]$ normalization of inconsistency indicators in pairwise comparisons. The need for normalization, as well as problems with the lack of normalization, are presented. A new type of paradox of infinity is described.

Rating scales are used to elicit data about qualitative entities (e.g., research collaboration). This study presents an innovative method for reducing the number of rating scale items without the predictability loss. The “area under the receiver operator curve method” (AUC ROC) is used. The presented method has reduced the number of rating scale it...

Today, computer systems become one of the most important systems in technology and our life. They have a plenty of possible applications but most of them can be described as a transformation of (electrical) energy into useful work = calculations. This process is not so simple as it seems to be because the structure of computers hardware is very com...

Despite the fact that much has been said about processing in computer science, it seems that there is still much to do. A classical approach assumes that the computations done by computers are a kind of mathematical operation (calculations of functions values) and have no special relations to energy transformation and flow. However, there is a poss...

Processing in computer systems is a transformation of (electrical) energy into useful work = calculations. Processing is done on a hardware level thanks to existing algorithms and operating systems. Poster presents the influence of long-term processes on hard drives performance.

The aim of this paper is to show the recurrence method for obtaining the number of inversions In(k) in input sets with different sizes n, when the information about In−1(k) is given. The proposed method is based on a simple observation that the use of recursive approach gives an elegant way for obtaining those numbers in contradiction to the so far...

Deans foreword In 2015 celebrated the 50th anniversary of the Faculty of Electrical and Computer Engineering , Ignacy Łukasiewicz Rzeszów University of Technology. The first students began their education at the Faculty of Electrical Engineering in 1965 that is less than two years after the establishment of the First Degree Engineering School in Rz...

This paper shows the problem of possible existence of statistical self-similarity and long-range (long-term) dependencies in behavior of computer memory systems. It will be shown, that the hierarchical structure of memory and the dispersion of time constants during accessing successive levels of such a structure, lead to "memory effect" and self-si...

Sorting is one of the most frequently used types of processing in computer systems. In presented approach sorting will be considered as an introduction of order into processed input task and algorithm as a physical system (responsible for computations). This analysis shows how the dependencies in processed tasks can influence the behavior of algori...

The optimal computer network performance models require accurate traffic models, which can capture the statistical characteristic of actual traffic. If the traffic models do not represent traffic accurately, one may overestimate or underestimate the network performance. The paper presents confirmation of the self-similar nature of the selected prot...

Many different measures were proposed to describe the problem of possible software co mplexity-the nu mber of lines of code sometimes referred as a source lines of code (SLOC), Halstead's volume V, McCabe cyclo matic number V(G), among others. However, any of them doesn't take into account the possible fractal properties of software source code eme...

The queuing, as an inherent feature of each real system, plays a very important role in teletraffic networks as well. It is known that the queuing system consists of three basic components: the input stream of requests, the service processes and the queue discipline. The optimal performance of system can be achieved only in the case when all compon...

This paper shows that the organization of computer system memory as a hierarchical structure can lead to the existence of long-memory effect during the man-computer interaction. As a point of reference, the rate at which the operating system resolves data from hard drive caused by the hardware page faults in the virtual memory mechanism can be give...

This work presents the problem of clusters computing performance optimization. An assessment of the impact of computing architecture, applications, and communications equipment on the system performance was done. Processing bottlenecks were identified, showing that in order to obtain an optimum usage of computational structure the system should be...

Taking into account the fact that the computer systems, as the implementations of Turing machine, are physical devices, the paper shows considerations in which hard drive behavior will be presented in terms of statistical mechanics. Because computer is a machine, its analysis cannot be based only on mathematical models apart of physical conditions....

In present paper there are studied some properties of Benford’s law. The existence of this law in not necessary large sets of numbers is a very interesting example that can show how the complex phenomena can appear in the positional number systems. Such systems seem to be very simple and intuitive and help us proceed with numbers. However, their si...

Tsallis definition of non-extensive entropy introduced in 1988 has been considered to obtain new possibilities to construct generalized thermodynamical basis for statistical physics expanding classical Boltzmann–Gibbs thermodynamics for nonequilibrium states. During the last two decades this q-generalized theory has been successfully applied to con...

This paper presents a new analytical and experimental approach to the insertion sort algorithm and task processing dynamics. The dependencies that exist in the task structure can influence the algorithm’s behavior, especially in the number of dominant operations that are needed to compute the computational complexity. The proposed approach is based...

This paper deals with new analytical and experimental aspects of a channel's capacity in the presence of excess nonwhite Gaussian noise with long-range dependencies described by the Hurst parameter H. Shannon's theory of information based on the assumptions given by the Boltzmann|Gibbs extensive thermodynamical basis, does not allow description of...

The paper will show the direct connections between q-Malthusian growth model, i.e. the classical exponential growth model generalized in Tsallis statistics, and the coalition growth model introduced by von Foerster in 1960. As it will turn out, the equations that have been taken into account when the coalition model was introduced, are closely rela...

An article shows a wide depiction of conception of paradigms evolution in science and surrounding reality. The presented approach is based on a new formula of system paradigm approach, which assumes wide depiction in analysis, description and synthesis of real systems as complex systems governed by long-range dependencies in space and time domain....

Tsallis entropy introduced in 1988 is considered to have obtained new possibilities to construct generalized thermodynamical basis for statistical physics expanding classical Boltzmann-Gibbs thermodynamics for nonequilibrium states. During the last two decades this q-generalized theory has been successfully applied to considerable amount of physica...

Tsallis entropy introduced in 1988 is considered to have obtained new possibilities to construct generalized thermodynamical basement for statistical physics expanding classical Boltzmann–Gibbs–Shannon thermodynamics for non-equilibrium states. During the last two decades this q-generalized theory has been successfully applied to a considerable amo...

Systems are very popular, in the world that we live. On the one hand they can be as small as atoms, on the other hand they can be compared to the whole universe, which is a huge system in itself. The first systems were, of course, those natural ones - the nature created them; nowadays there are also manmade systems. Despite the fact that man has ob...

An article shows the problem of existence the long-range dependencies in algorithmic computing. A brilliant idea of Turing machine, which is the basis of all theoretical considerations in the contemporary computer engineering, seems to be, from the system analysis point of view, only a complicated system that works only under an algorithmic process...

Tsallis entropy introduced in 1988 based on the equation Sq=1−∑ipiqq−1 has been considered to obtain new possibilities for constructing a generalized thermodynamical basis for statistical physics, expanding classical Boltzmann–Gibbs thermodynamics for non-equilibrium states. During the last two decades this q-generalized theory has been successfull...

This paper presents a preliminary analysis of the system behavior that works far from the thermodynamical equilibrium states in the environment with limited resources. The examples of such systems are the real computer systems. Nowadays in such systems the runoff characteristic of the information flow is very turbulent in contradiction to the curre...