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1
Content available Learning a fuzzy model for evacuation speed estimation using fuzzy decision trees and evolutionary methods
Kello P., Gregor M., Miklóšik I., Spalek J.
Zeszyty Naukowe Wyższej Szkoły Technicznej w Katowicach
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2017
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nr 9
50--62
EN
The paper deals with evacuation time estimation using a fuzzy meta-model inferred from data using a combination of fuzzy decision trees (to construct the rule base) and evolutionary tuning (to optimize the membership functions). It uses real data – collected from existing literature. The paper first covers some basic facts concerning evacuation in road tunnels and its simulation. It then proceeds to discuss evolutionary tuning of fuzzy systems and fuzzy decision trees and describes the proposed approach. It shows that this approach improves upon previous results achieved using a purely evolutionary approach.
PL
Artykuł zajmuje się oszacowaniem czasu ewakuacji przy użyciu rozmytego meta-modelu wyprowadzonego z danych używając kombinacji rozmytych drzew decyzyjnych (aby konstruować podstawę reguły) oraz ewolucyjnego dostrajania (aby zoptymalizować funkcje przynależności). Wykorzystuje on dane rzeczywiste - zgromadzone z istniejącej literatury. Artykuł omawia najpierw pewne podstawowe fakty dotyczące ewakuacji tuneli drogowych i jej symulacji. Następnie przechodzi do omówienia ewolucyjnego dostrajania systemów rozmytych i rozmytych drzew decyzyjnych oraz opisuje proponowany sposób podejścia. Pokazuje, że to podejście poprawia wcześniejsze wyniki osiągnięte przy użyciu podejścia czysto ewolucyjnego.
2
Content available The transfer of knowledge in technological cross‐border industry cluster – case study
Kurowska-Pysz J., Gregor M.
Management Systems in Production Engineering
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2014
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nr 2 (14)
63--67
EN
The paper discusses the problem of creation and development of business, technology clusters, aimed at developing knowledge base for cross‐border environment. The discussed example concerns Polish‐Slovak cluster, focused on research of innovative methods for monitoring the safety of structure using fiber Bragg grating sensors.
PL
Artykuł omawia problematykę tworzenia i rozwijania działalności klastrów przemysłowych, technologicznych, ukierunkowanych na rozwijanie zasobów wiedzy w środowisku transgranicznym. Omawiany przykład dotyczy klastra polsko-słowackiego, koncentrującego się na badaniach innowacyjnej metody monitoringu bezpieczeństwa konstrukcji przy pomocy światłowodów z siatkami Bragg’a.
3
Content available remote Tendencje projektowania systemów produkcyjnych
Gregor M., Matuszek J.
Mechanik
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2013
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R. 86, nr 7CD
231--238
PL
Artykuł przedstawia współczesne tendencje rozwoju technologii informatycznych w procesach zarządzania systemami produkcyjnymi. Określono współczesne sposoby wzrostu produktywności. Opisano wybrane przykłady zastosowań technologii cyfrowych w przedsiębiorstwach produkcyjnych, określono efekty wybranych projektów w praktyce produkcyjnej. Wskazano kierunki dalszego rozwoju technologii cyfrowych i ich wpływ na inteligentne zintegrowane rozwiązania systemów zarządzania w przedsiębiorstwach.
EN
The article presents contemporary trends in the development of information technology in manufacturing systems management processes. There are characterized today’s concept of productivity growth. The author presents some examples of applications of digital technologies in production enterprises and the effects of selected projects in industrial practice were determined. The directions of further development of digital technologies and their impact on intelligent integrated solutions management systems in enterprises.
4
Content available Modelling and simulation of manufacturing processes in managing and planning of machines’ setup
Gregor M., Matuszek J., Plinta D.
Advances in Manufacturing Science and Technology
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2013
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Vol. 37, nr 1
7--17
EN
In the paper, there is presented the practical application of the modelling and simulation in managing and planning of machines' setup. There are described principles and stages of the production system improvement with the theory of constraints (TOC) and illustrated by the example of analysis of the whole production line, which aim was the bottleneck determining, and the analysis of operations, which are realized in the bottleneck. Main attention in this analyse was focused on the problem of the production setup. Exchange of tools and reconversion of production devices on the production of other product are non value added activities. It means activities, which we should limit. There is presented, that with use of simulation it is possible to check different variants of possible ways of machines' setup and to choose the best process run for realization.
PL
W artykule przedstawiono praktyczne zastosowanie modelowania i symulacji w zarządzaniu i planowaniu przezbrojeń maszyn. Opisano zasady oraz etapy doskonalenia systemu produkcyjnego zgodne z teorią ograniczeń. Zilustrowano je praktycznym przykładem analizy linii produkcyjnej, której celem było ustalenie jej wąskiego gardła oraz szczegółowa analiza czynności wykonywanych na zidentyfikowanym ograniczającym stanowisku - wąskim gardle procesu. Główną uwagę zwrócono na problem przezbrojeń linii produkcyjnych. Wymiana narzędzi i przestawienie urządzeń na produkcję innego wyrobu jest działaniem niedodającym wartości, a więc takim, które należy ograniczać. Za pomocą symulacji można sprawdzić różne warianty sposobów przezbrojeń i wybrać do realizacji najlepszy.
5
Content available remote Opal mineralization from Cigel’ locality (Central Slovakia)
Gregor M.
Geology, Geophysics and Environment
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2012
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Vol. 38, no. 4
475--476
EN
Besides the famous precious opals from Eastern Slovakia, the Neogene volcanic field in Central Slovakia shows numerous localities with various types of opals. Unfortunately these localities contain only common opal (or potch opal), but moreover, there are only few information on mineralogical composition or genesis of such opal types in Slovakian geological literature. Common opals are bound to all types of volcanic rocks and their pyroclastics. They can be found in fissures and cracks in basaltic, andesitic as well as in rhyolitic rocks. The Cigel' locality was chosen from the number of different opal localities based on the well preserved cross sections through the andesitic volcanic rocks and redeposited pyroclastics of Vtacnik Formation (Śimon et al. 1997) Opals can be found in irregular nodules of variable size in weathered redeposited pyroclastic materials as well as in fissures and cracks in fresh andesitic rocks. Opals are often associated with greenish clays, which are often intimately overgrown with opal, or they create a thin crust around the opal nodules. Also they create infilling of fissures in weathered pyroclastic material. Selected samples of opal were studied using optical microscopy, powder X-ray diffraction analyses (PXRD), scanning electron microscopy (SEM), infrared spectroscopy (IR) and electron microprobe (EMPA) in order to determine their exact mineralogical and chemical composition. Both types of opals samples (nodules and infilling of cracks in fresh andesite) shows typical PXRD pattern for opal-CT (Floerke et al. 1991, Graetsch 1994) with presence of expandable layer silicates. Etched surfaces of samples show presence of lepispheres (Floerke et al. 1975) of opal-CT in SEM. Based on IR analyses the associated clays consist mainly of nontronite, kaolinite was detected in lower amount. Chemical composition of opals is quite variable. Samples are not homogenous, they show two different phases which are either poor or rich on trivalent compounds. With increasing amount of trivalent compounds the content of SiO2 is getting lower, but the concentration of divalent and monovalent impurities is significantly getting higher. As for comparison phases poor on trivalent compound shows concentration of A12O3 up to 0.01 wt. % and Fe2O3 up to 0.2 wt. %. The concentration of SiO2 in this phase reaches up to 99.2 wt. %. Phase rich on trivalent compounds shows concentration of A12O3 up to 2.7 wt. % and 23.3 wt. % for Fe2O3. SiO2 concentration reaches 64.3-83.4 wt. %. Besides the opal phases, also impurities with high concentrations of MnO2 and Fe2O3 were identified. Sums over 100 wt. % belong to moganite, which was subsequently identified by the means of Raman spectroscopy. Based on the field observations, detected mineralogical features and chemical composition, an infiltration-weathering formation of opal was proposed. The proposed process includes low-temperature hydration of volcanic glass (smeetititzation) in solid state (Śamajova et al. 1992, Velde & Meunier 2008). Access of silica is transported by descending fluids and subsequently the opal can be precipitated in fissures or in cracks (Koivula et al. 1983, Horton 2002) between the weathered pyroelastic materials or in cracks and fissures in fresh andesite.
6
Content available Simulation of manufacturing and logistics systems for the 21th century
Palajová S., Figa S., Gregor M.
Applied Computer Science
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2012
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Vol. 8, no 1
45--57
EN
This paper deals with computer simulation of manufacturing systems. It contains the basic simulation theory and principles of a simulation project management. Furthermore the authors introduced the idea of parametric simulation model, followed by special application areas of simulation, e.g. scheduling, emulation, metamodelling. The paper discusses the possibility to utilize a cloud computing technology in simulation. The case example of the application of simulation by the optimization of real production system concludes the working part of paper. The final part summarizes benefits and recommendations.
7
Content available Simulation of manufacturing and logistics systems for the 21th century
Palajová S., Figa Š., Gregor M.
Applied Computer Science
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2011
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Vol. 7, no 2
47--60
EN
This paper deals with computer simulation of manufacturing systems. It contains the basic simulation theory and principles of a simulation project management. Furthermore the authors introduced the idea of parametric simulation model, followed by special application areas of simulation, e.g. scheduling, emulation, metamodelling. The paper discusses the possibility to utilize a cloud computing technology in simulation. The case example of the application of simulation by the optimization of real production system concludes the working part of paper. The final part summarizes benefits and recommendations.
8
Content available Person movement prediction using artificial neural networks with dynamic training on a fixed-size training data set
Mikluščak T., Gregor M.
Applied Computer Science
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2011
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Vol. 7, no 2
33--46
EN
Significant technical development over the last years has lately been showing more and more promise of making the vision of smart environments come true. The role of future smart environments lies in proactive interaction. Prediction of user’s actions plays a vital role in such interaction. This paper presents a method based on artificial neural networks designed to accommodate the problem of person movement prediction. The paper explores the importance of dynamic training in prediction of nonstationary time series. An approach to dynamic training, based on the so-called on-the-fly training, is presented.
9
Content available Adaptive switching of mutation rate for genetic algorithms and genetic programming
Spalek J., Gregor M.
Applied Computer Science
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2011
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Vol. 7, no 1
30-37
EN
The paper concerns the application of Genetic Algorithms and Genetic Programming to complex tasks such as automated design of control systems, where the space of solutions is non-trivial and may contain discontinuities. An adaptive value-switching mechanism for mutation rate control is proposed. It is shown that the proposed mechanism is useful in preventing the search from getting trapped in local extremes of the fitness landscape.
10
Content available Adaptive approaches to parameter control in genetic algorithms and genetic programming
Spalek J., Gregor M.
Applied Computer Science
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2011
|
Vol. 7, no 1
38--56
EN
The paper concerns the application of Genetic Algorithms and Genetic Programming to complex tasks such as automated design of control systems, where the space of solutions is non-trivial and may contain discontinuities. Several adaptive mechanisms for control of the search algorithm's parameters are proposed, investigated and compared to each other. It is shown that the proposed mechanisms are useful in preventing the search from getting trapped in local extremes of the fitness landscape.
11
Content available remote Simulation and emulation of manufacturing systems behaviour
Gregor M., Škorík P.
Management and Production Engineering Review
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2010
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Vol. 1, No. 2
11-21
EN
Current manufacturing systems must operate under resource constraints. Simulation can help to improve the operation of such manufacturing systems. This paper describes the principles of computer simulation and emulation used for the modelling of behaviour of real production systems. Simulation as the technology of 21. Century is used for the analysis of dynamics of manufacturing system. Emulation approach is used for the analysis of a control system and control rules used for the control of a real manufacturing system. The evolution principles and algorithms were used by the optimization of manufacturing system performance. Especially Genetic Algorithms (GA) were used to optimize the parameters of manufacturing system. The paper presents the comparison of results gained trough classical optimization algorithms and GA.
12
Content available remote Application of Digital Engineering and Simulation in the Design of Products and Production Systems
Gregor M., Medvecký Š.
Management and Production Engineering Review
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2010
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Vol. 1, No. 1
71-84
EN
The paper presents the results of research & development done at the University of Žilina, Faculty of Mechanical Engineering in the area of Digital Engineering and simulation in the design of products and production systems. The digital technologies are used in innovation process of products and production systems. The paper describes the concept of Digital Factory being developed at the University of Žilina. Starting from the conceptual model of a product the whole chain of digital design processes of the given product and its production system are described. The digitization procedure is presented using 3D laser scanning technologies. The paper presents the theoreti cal research done in metamodelling based on computer simulation and used by the choice of the appropriate shop floor control system. The future research goals are presented as well.
13
Content available remote Wytwarzanie gazu do syntezy amoniaku : ewolucja technologiczna wymywania CO2 z gazu procesowego roztworem węglanu potasowego
Cwalina J., Gregor M., Pohorecki R.
Przemysł Chemiczny
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2009
|
T. 88, nr 12
1268-1272
14
Content available remote Symulacja pracy inżektora parowego w węźle usuwania CO2 z gazu syntezowego
Dukowicz J. W., Gregor M., Możeńska B.
Przemysł Chemiczny
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2009
|
T. 88, nr 12
1280-1282
15
Content available remote Modele termodynamiki procesowej w pakiecie oprogramowania symulacyjnego linii technologicznych wytwarzania amoniaku
Dukowicz J. W., Stryjek R., Możeńska B., Gregor M.
Przemysł Chemiczny
|
2009
|
T. 88, nr 12
1274-1278
16
Content available Przestrzenne rozmieszczenie osiadań w rejonie Kopalni Soli Wieliczka w świetle satelitarnych danych interferometrycznych
Wąsowski J., Bovenga F., Nutricato R., Conte D., Refice A., Gregor M., Kowalski Z.
Przegląd Geologiczny
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2009
|
Vol. 57, nr 2
164-172
EN
The paper presents the use of the Persistent Scatterers Interferometry (PSI) Synthetic Aperture Radar (SAR) data to determine magnitude of subsidence in area of the town ofWieliczka. The town is home to a unique salt mine, over 700 years old, one of the best known tourist attractions in Poland. Each year the mine is visited by about 1 million tourists from all over the world and in 1978 UNESCO placed it on its first International List of theWorld Cultural and Natural Heritage. There is direct evidence that the mining has been influencing stability of ground and buildings in the town, which is located above the mine. The application of the PSI SPINUA technique made it possible to identify large number of radar targets (with density exceeding 100 PS/km2), suitable for monitoring ground motion in the Wieliczka area. The results show continuous subsidence with average annual movements ranging from a few millimeter per year to 24 mm/yr in the period 1992–2000. The detected subsiding zone very well corresponds to the extent of the underground salt mine. There are also indications of possible connections between the mine-induced subsidence and the presence of the old large landslides occurring on the north-facing slopes south of the Wieliczka Salt Mine.
17
Content available Digital factory
Gregor M., Medvecky S., Matuszek J., Stefanik A.
Journal of Automation Mobile Robotics and Intelligent Systems
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2009
|
Vol. 3, No. 3
123-132
EN
The paper presents the results of research and development of the Digital Factory solutions in industry. The implementation of this technology in industry is described and discussed. The results of research and development cover design of assembly system, its processes, simulations model, ergonomic analysis etc. In the paper are presented the solutions developed in the framework of co-operation with industrial partners like Volkswagen Slovakia, Thyssen Krupp - PSL, Whirlpool. The paper contains results of research realized in 3D laser scanning and digitization of large size objects of the current production systems. The developed and validated methodology shows the procedure of 3D laser scanning application by the digitization of production halls, machine tools, equipment, etc. This procedure was tested and validated in chosen industrial companies. The paper presents achieved benefits and future research goals as well.
18
Content available The analysis of relationship among the total productivity, profitability and economic value added
Gregor M., Ferencz V, Gregorova S
Applied Computer Science
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2009
|
Vol. 5, no 1
39--54
EN
The profitability of enterprise activities is one of the evaluation ways of management effectiveness of enterprise operations. The profitability ratios are quite well described in economics and financial literature. The current authors were less focused on the analysis of the ways of how to determine the main factors which influence the level of profitability. This problem is crucial and extraordinary important by the introduction and utilization of new production strategies. The paper defines the Total Productivity and the Total Productivity Break Even Point concept (TP_BEP). It describes the linear model of the Total Productivity Break Even Point with the developed expressions for calculation of a and b regression coefficients. The mathematical models of Total Productivity and EVA were described. Further focus of the paper was on the definition of relationships between Total Productivity an profitability (ROA). The mathematical model of this relationship was developed. The paper introduces the idea of mutual relationship of Total Productivity (PT) and Economic Value Added (EVA). The Break Even Point concept of Total Productivity was used by the development of relationship model of EVA and Total Productivity. The final solution was simplified for easy practical utilization.
19
Content available Intelligent manufacturing systems - automatic speech recognition system
Gregor M., Michulek T
Applied Computer Science
|
2009
|
Vol. 5, no 1
55--68
EN
The University of Žilina and the Central European Institute of Competitiveness have been conducting research in development of Intelligent Manufacturing System. One of areas researched was Automatic Speech Recognition (ASR) and control of manufacturing processes through voice control. This paper presents chosen results from research done at the University of Zilina and at the Central European Institute of Technology.
20
Content available Artificial intelligence toolsin simulation and optimization of production systems
Škorík P., Gregor M., Štefanik A
Applied Computer Science
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2009
|
Vol. 5, no 2
42--57
EN
This article deals with solution developed as a cooperation of Industrial engineering department, University of Žilina and Central European Institute of Technology (CEIT SK). Proposed solution involves simulation with support of virtual reality for searching of engineer-accepted manufacturing system state (so called "optimal"). Article includes basic information about evolution methods and genetic algorithms. Authors own algorithm, which is based on use of genetic algorithm, is used for optimization. Outcomes compares the speed of convergence of chosen Witness optimization algorithms and authors-developed algorithm. Comparison is presented on project from industrial praxis.
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