Wyniki wyszukiwania - BazTech

1

Potential of Multi-Agent Systems for Operation of Transportation Systems

Madejski J.

Pomiary Automatyka Robotyka

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2016

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R. 20, nr 1

31--36

EN

The article discusses the possibility of implementation of the currently available solutions with software agents in transport, focusing on applications for planning transport systems, control, monitoring and analysis of the state of the superstructure and potential applications to the planning of the maintenance tasks.

PL

W artykule omówiono możliwość zastosowania dostępnych obecnie rozwiązań z agentami programowymi w transporcie, koncentrując się na zastosowaniach do planowania systemów transportowych, sterowania nimi, monitorowania i analizy stanu nawierzchni kolejowej, a także możliwymi zastosowaniami do planowania prac utrzymaniowych.

2

Co-ordination in the autonomous software agents’ systems

Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2012

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Vol. 55, nr 1

74--79

EN

Purpose: Agents are designed to behave individually rational, which means that they should maximize their personal utility which is the way to make them less vulnerable to mean actions of others, yet they have to co-ordinate their actions to reach common goals, which is the purpose of this work. Design/methodology/approach: Agents can create and pursue their individual goals, behaving in a ‘selfish’ way to acquire the desired state of their world. To achieve that they may choose to adopt goals of other agents too, should this co-ordination be assessed as beneficial for them. Moreover, there is also a possibility to define the desired states of the agents in a way which will induce them to work together rather than try to operate individually. This may include their specialization, which forces in most cases sharing of their potential. This may be achieved by specialised design of agents being able to carry out elementary tasks. Such approach calls however, for design of a layer of supervisory agents which will be capable of realising what is the multi-agent overall system goal, setting up their teams from simple agents and committing to common sub-goals. All such systems may be efficiently developed only after careful study of the successfully operating systems in which humans are the agents, whose tasks may now be assigned to the software ones. These agents have to be coupled, as it also happens in their human counterparts. Findings: Development of the software agents’ co-operation framework based on review of publications covering both the fundamental considerations, as well as the latest developments. Research limitations/implications: Approach presented still needs careful testing and refinement of the co-ordination / negotiation rules. Originality/value: Co-ordination of agents to reach their common goal, satisfying also their individual utility.

3

Dynamic scheduling for agent based manufacturing systems

Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 40, nr 1

66-69

EN

Purpose: Development of the decision making architecture for the multi-agent societies with temporal restrictions. General ideas for the necessary architecture based on the blackboard one is presented. Design/methodology/approach: Fuzzy logic approach that makes it possible to reach suboptimal solutions within the acceptable timeframe. Development of the relevant systems calls for compiling the experience gathered over the years in the system served by human ‘agents’. Multiagent systems negotiation needs were analysed and cooperation issues in the form of clustering, cloning, and learning were analysed in search for the relevant tools. Findings: Detailed review of the approach to development of the agent based Intelligent Manufacturing from the fundamental considerations to the latest hands-on developments. Research limitations/implications: Many presented technologies call for detailed study before they can be implemented in practice. Originality/value: Analysis of the local interactions among agents meeting the real-time reaction requirements.

4

Laserowy pomiar układów geometrycznych rozjazdów

Madejski J.

TTS Technika Transportu Szynowego

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2009

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R. 15, nr 11

41-45

PL

W ostatnich latach ma miejsce istotny postęp w transporcie szynowym. Większe prędkości jazdy, krótsze odstępy między kolejnymi pociągami, dłuższe pociągi o większych naciskach na oś, są przyczyną wprowadzania zaostrzonych wymagań związanych z elementami nawierzchni kolejowej.

5

Selection of heat treatment condition of the Mg-Al-Zn alloys

Dobrzański L. A., Tański T., Cizek L., Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 32, nr 2

203-210

EN

Purpose: Main aim of this paper are results of the optimization of heat treatment conditions, which are temperature and heating time during solution heat treatment or ageing as well the cooling rate after solution treatment for MCMgAl12Zn1, MCMgAl9Zn1, MCMgAl6Zn1, MCMgAl3Zn1 cast magnesium alloys. Design/methodology/approach: The following results concern mechanical properties especially hardness. Findings: The different heat treatment kinds employed contributed to the improvement of mechanical properties of the alloy. Research limitations/implications: According to the alloys characteristic, the applied cooling rate and alloy additions seems to be a good compromise for mechanical properties, nevertheless further tests should be carried out in order to examine different cooling rates and parameters of solution treatment process and aging process. Practical implications: Generally magnesium alloys are applied in motor industry and machine building, but they find application in a helicopter production, planes, disc scanners, a mobile telephony, computers, bicycle elements, household and office equipment, radio engineering and an air - navigation, in chemical, power, textile and nuclear industrial, etc. Originality/value: Contemporary materials should possess high mechanical properties, physical and chemical, as well as technological ones, to ensure long and reliable use. The above mentioned requirements and expectations regarding the contemporary materials are met by the non-ferrous metals alloys used nowadays, including the magnesium alloys.

6

Cooperating agents approach to task execution planning

Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 37, nr 1

52-56

EN

Purpose: The aim of the paper is to investigate the behaviour of the cooperating agents having to agree task execution. Design/methodology/approach: A heuristic method is proposed for scheduling tasks that should be carried out by a group of agents. An important issue is that the agents have to complete their negotiations to commit to the task and carry out it in real time. This task was solved by splitting the problem solving into two layers which make it possible to obtain the rough solutions first and further improve them next as much as possible. Findings: The first layer proposed refers to tasks assigned static priorities and its goal is to meet the real time requirements. Next, the agents can proceed to obtain the optimized solution, provided there is time to do it before the task execution has to begin. Research limitations/implications: Analysis of the negotiations procedure was done and model examples were worked out to develop a planning system based on these design requirements. Practical implications: Implementing the real time task execution planning in artificial agents brings them closer to the job shop floor real life requirements, making it possible to develop software entities mimicking reactions of humans and capable of joint task execution planned on the fly as needed. Originality/value: Analysis of the real time task planning and execution of groups of agents.

7

Niezawodność rozjazdów. Gromadzenie i ocena wyników pomiarów układów geometrycznych rozjazdów

Madejski J.

Infrastruktura Transportu

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2009

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nr 6

34-37

PL

Zużycie jest krytycznym czynnikiem decydującym o niezawodności rozjazdów i bezpieczeństwie eksploatacji, stąd konieczne jest monitorowanie jego postępu. Monitorowanie takie musi obejmować kontrolę geometrii, a także kontrolę wizualną ściśle określonych elementów wraz z usystematyzowaną oceną ich stanu. Artykuł przedstawia system GeoTEC-Rozjazdy, będący połączeniem bazy danych i systemu doradczego, który umożliwia wykrywanie słabych punktów w torach i śledzenie postępującej ich degradacji. Pakiet GeoTEC-Rozjazdy przeznaczony jest do archiwizacji i zarządzania danymi pomiarowymi parametrów rozjazdu pochodzącymi z pomiarów wykonanych przy pomocy toromierzy TEE oraz DTG.

EN

Wear is a critical factor determining the reliability of turnouts and the safety of rail tracks, therefore the control of its progress is necessary. Turnout monitoring has to include its geometry parameters evaluation, as well as the visual checkout of its strictly defined elements and assessment of their condition. The article presents the GeoTEC-Rozjazdy application for monitoring the performance of turnouts, being a combination of a database and a management system, which enables the detection of weak points of rail tracks and control of their degradation. The system can be applied to gathering and management of measurement data of turnout parameters obtained with the use of the TEE and DTG track gauges.

8

The influence of the heat treatment on the microstructure and properties of Mg-Al-Zn based alloys

Dobrzański L. A., Tański T., Cizek L., Madejski J.

Archives of Materials Science and Engineering

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2009

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Vol. 36, nr 1

48-54

EN

Purpose: In the following paper there have been the structure and properties of the MCMgAl12Zn1, MCMgAl9Zn1, MCMgAl6Zn1, MCMgAl3Zn1 magnesium cast alloy as-cast state and after a heat treatment presented. Design/methodology/approach: A casting cycle of alloys has been carried out in an induction crucible furnace using a protective salt bath Flux 12 equipped with two ceramic filters at the melting temperature of 750±10°C, suitable for the manufactured material. The following results concern light and scanning microscopy, X-ray quantitative microanalysis and mechanical properties. Findings: The examined alloys in as-cast state characterize a microstructure of α solid solution constituting the alloy matrix, the β - Mg17Al12 intermetallic phase in the form of plates located mostly at grain boundaries as well as near needle eutectic precipitations Mg17Al12 (α + β). In the structure one can also observe, using the EDS system, big concentrations of silicon, manganese and iron. The ageing process has caused the precipitation of evenly distributed dispersive β secondary phase in the needle form. Practical implications: A good capability of damping vibrations and low inertia connected with a relatively low weight of elements have predominantly contributed to the employment of magnesium alloys for the fast moving elements and in locations where rapid velocity changes occur; some good examples may be car wheels, combustion engine pistons, high-speed machine tools, aircraft equipment elements, etc. Originality/value: The undertaken examinations aim at defining the influence of a chemical composition and precipitation processes on the structure and casting magnesium alloy properties in its as-cast state and after heat treatment with a different content of alloy components.

9

Assessment of the didactic measurement results using FCM type networks

Gumińska M., Madejski J.

Archives of Materials Science and Engineering

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2009

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Vol. 39, nr 1

45-52

EN

Purpose: The paper presents students egzamination system developer for the scaleable e-learning system. Organisation of the teaching and examination processes, as well as the implementation details are described. An intelligent system based on one of the Artificial Intelligence methods - FCM (Fuzzy Cognitive Maps) type network is being developed within the framework of current work on the e-learning process topic, to model the behaviour and functioning the system as a whole. Design/methodology/approach: The intelligent examination system for students was developed based on mechanism derived from HotPotatoes system. Programming languages like PHP and JavaScript were also used. Fuzzy Cognitive Maps were used to model the e-learning process and an example of the system use is presented. Findings: The project effect is the intelligent examination system supporting the statistical analysis of the difficulty level of test problems, generating comments and materials individually for every user. The didactic process was modelled using FCM method. Practical implications: Reduction of test checking time consumption, individual attitude to every student, score advised to the students along with the comments pertaining to the wrong answers and recommended study topics - all immediately after the test, sent to the student's mailbox. Originality/value: Employment of FCM AI tool for evaluation of the teaching process effectiveness.

10

Agent architecture for intelligent manufacturing systems

Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 29, nr 2

167-170

EN

Purpose: Analysis is made of requirements posed by tasks of agents operating in the intelligent manufacturing systems and their resulting architecture is presented. Design/methodology/approach: Architecture of agent systems for industrial environment is presented, making it possible to generate the particular agents customised for the specific tasks, based on the automatic analysis of its required features. Findings: Extension of cellular automata approach underlying the conventional agent behaviour specification using the Fuzzy Cognitive Maps is presented in conjunction with the neural networks providing learning capability of the agents designed for the various levels of the manufacturing supervisory and execution systems. Adding reaction time specification to FCM makes it possible to analyse and design systems with the required behaviour. Research limitations/implications: Specific features of the designed agent architecture have been tested as separate mechanisms which can be merged into the final comprehensive at a later stage. Originality/value: Agent architecture is proposed for the industrial applications of single agents and their groups that can collaborate to achieve the individual and joint goals specified in reaction to changing environment conditions and into their agendas in XML format. Automatic generation of custom agent reactions models can be carried out based on a set of requirements that may be specified in the if-then rules form.

11

Web based e-learning platform as a source of the personalised teaching materials

Gumińska M., Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 24, nr 2

227-230

EN

Purpose: The goal of this work was to develop further the educational platform of the Internet Students Teaching Centre (ISTC) - the e-learning system based on the available state-of-the-art internet technologies (HTML, CSS, PHP, MySQL) with the possibility to generate the personalised PDF documents. Design/methodology/approach: The paper presents the process of working out the educational materials package in PDF format, generated from the lecture notes (PowerPoint), instruction sheets with test problems (Excel), and knowledge tests (Hot Potatoes). Educational materials are generated dynamically on the e-learning platform, i.e., individually for each student. A detailed example is included-of working out the PDF document format and its automatic generation along with the course student certificate using the PHP scripts. Findings: The efficient method of assisting remotely the e-learning students acquiring skills and knowledge at a varying pace has been developed, providing them with the personalised support. Research limitations/implications: Extensive testing has to be carried on big students groups, more course materials have to be developed and uploaded onto the e-learning platform. Originality /value: Possibility of creating the personalised documents is the first stage in generating the programmed course materials, which - after verifying student's knowledge and determining his or her arrears - are automatically sent to the student, containing more detailed explanations on required topics.

12

Survey of the agent-based approach to intelligent manufacturing

Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 21, nr 1

67-70

EN

Purpose: Summary of the state-of-the-art of the Distributed Artificial Intelligence applied to Intelligent Manufacturing. Main applications are presented along with different technologies applied in these areas. Design/methodology/approach: Intelligent Manufacturing area was split into many segments, which require different approach to intelligent problem solving. Multiagent systems negotiation needs were analysed and cooperation issues in the form of clustering, cloning, and learning were analysed in search for relevant tools. Findings: Detailed review of the approach to development of the agent based Intelligent Manufacturing from the fundamental considerations to the latest hands-on developments. Research limitations/implications: Many presented technologies call for detailed study before they can be implemented in practice. Originality/value: Thorough review of the Distributed Artificial Intelligence approach to current agile manufacturing needs. Key technologies are pointed out along with the main areas in which they can be implemented, and which require further research.

13

Scaleable model of e-learning platform

Gumińska M., Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 21, nr 1

95-98

EN

Purpose: The issue of distance learning is presented in the work, and especially the development stages of the educational platform of the Internet Teaching Centre for Students (further referred to as ICKS), which is planned to be used for implementation of the e-learning didatcic process. Design/methodology/approach: The following programming technologies were used for development of the educational platform: HTML, CSS, JavaScript, PHP and SQL. The relational database was designed using the DFD and ERD models, and created in MySQL using the SQL language. PHP language was used to develop the relevant interface so that the user can access and modify data in the database; scripts in this language form the MySQL database front-end making it possible to carry out operations on data. The ICKS web page interface, including the Administrative Panel, Student Rooms, and Teacher Rooms, was developed using the HTML language and the CSS cascading style sheets. Findings: Detailed e-learning site specification requires were put forth and the contemporary technologies were applied to develop the framework for the scaleable e-learning platform. Research limitations/implications: The system will have to be filled in with relevant course materials and tested thoroughly before being fielded. Originality/value: System elements development completed out so far and detailed specifications make it possible to implement the platform to handle all subjects taught at the Institute.

14

Modelling of the manufacturing system objects interactions

Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 24, nr 2

167-170

EN

Purpose: Modelling of the agent based systems is presented along with a brief description of the relevant software toolkit. Design/methodology/approach: Areas of activity of the agent systems are presented, split into their internal and external domains, recognition of their world's state of affairs as well as planning of actions to affect their environment. Findings: Overview of the approach to development of the agent based systems from the general goal notion to its constituent elements, like plans and tasks. The proposed hybrid control structure allows both the horizontal level negotiations among the local agents and the vertical intervention by supervisory agents; therefore, such attitude makes also possible the multi-task and many-to-many negotiations. The result is the global control and the possibility of the decentralized negotiation. Research limitations/implications: Modelling LPA Chimera toolkit is based on Prolog which supports mainly backward chaining. Originality/value: Selection of a powerful and flexible agent systems modeling tool has been made, exemplary analysis of the agent based system model design has been presented. There agents representing the physical system elements, like a humans, machine, production line, shop floor system, the entire plant, or simply a workpiece; it may also be the part-oriented scheduling, or even the complete scheduling process.

15

Automatic detection of flats on the rolling stock wheels

Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 16, nr 1-2

160--163

EN

Purpose: The goal of this work was increasing safety of tram, metro and trams operation. Design/methodology/approach: The accelerometers were fixed directly to the rail to provide the system with the best defect signal quality. Analysis of the acoustic signals collected using microphones proved that too much of the background noise limited their usefulness. Findings: It has been proven that all wheel geometry defects can be reliably detected and classified according to the experimentally established defect categories. Research limitations/implications: Exact measurements of the wheel defect geometry may be possible only after collecting huge signals time series along with the wheel measurements taken with other methods to reveal the relationships between them. This goal is hard to achieve, as the system performs already very well, and such experiments would be very costly and time consuming. Practical implications: Integrated wheel geometrical data collected from the wheel ovality, flat spots, and build-up detection system along with the wheel profile information have eliminated all derailments due to faulty wheel geometry. Originality/value: The system presented is the first wheel monitoring application in Poland, its unique feature is that it can be used at low speeds, like those allowed in depots.

16

Zastosowanie metod sztucznej inteligencji do predykcji własności produktów hutniczych ze stali konstrukcyjnych

Dobrzański L. A., Kowalski M., Madejski J.

Hutnik, Wiadomości Hutnicze

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2005

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Vol. 72, nr 3

155--162

PL

W pracy opisano sposób predykcji wytrzymałości na rozciąganie oraz granicy plastyczności stali, z wykorzystaniem narzędzi sztucznej inteligencji. Opracowane modele wykorzystujące sztuczne sieci neuronowe wykorzystano następnie do opracowania symulatora, pozwalającego na obserwację analizowanych własności stali, przy ciągłej zmianie składu chemicznego oraz parametrów technologicznych produkcji stali. Wykorzystano również algorytmy genetyczne dla doboru składu chemicznego stali zapewniającego minimalizację ryzyka wytwarzania produktów nie spełniających założonych wymagań.

EN

The paper presents the new method for forecasting the yield point and the ultimate tensile strength for steel using the artificial intelligence tools. The developed models, using the artificial neural networks were used next for developing the simulator making itpossible to visualise the analysed properties of steel at the continuous changes ofits chemical composition and technological parameters of steel production. Genetic algorithms were also used for selection of the steel chemical composition, ensuring minimisation ofthe risk of manufacturing products that would not meet the requirements.

17

Pomiary parametrów geometrycznych szyn kolejowych w Hucue Królewskiej Sp. z o.o.

Zygmunt T., Pietryka J., Ptaszny E., Madejski J.

Hutnik, Wiadomości Hutnicze

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2004

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Vol. 71, nr 1

9-15

PL

Zainstalowane na Wydziale Walcowni Dużych w Hucie Królewskiej w Chorzowie stanowisko do pomiarów geometrii szyn, jest w pełni zautomatyzowanym urządzeniem pracującym on-line, służącym do pomiaru, oceny i klasyfikacji szyn oraz kształtowników na rozjazdy. Stanowisko jest przystosowane do przeprowadzenia pomiarów parametrów geometrycznych przekroju poprzecznego szyn, prostości i falistości powierzchni tocznej oraz prostości końców szyn w dwóch płaszczyznach. Pomiary realizowane są za pomocą zespołu laserowych głowic triangulacyjnych i mikromierzy elektronicznych z dokładnością 0,05 mm. Wyniki pomiarów i oceny szyn są wizualizowane na monitorze komputera, archiwizowane w bazie danych z możliwością tworzenia raporótw szczegółowych dla każdej szyny i/lub zbiorczych wg wybranych przez obsługę kryteriów.

EN

The rail measurement system installed at the Heavy Rolling Mill in Huta Królewska in Chorzów is a fully automated on-line system used for rail measuring, assessment and qualification. It is also used for manufacturinh the sections for turnouts. The system had been designed for measuring the geometric parameters of the transverse sections of rails, straightness and waviness of their running surface and ends straightness in two planes. The measurements are carried out with a set of the laser triangulation probes and laser micrometers with the accuracy of 0.05 mm. The measurement and quality assessment results are displayed on the operators computer screen and stored in the database, with the possibility of generating the detailed reports for each and every rail and/or summary ones according to criteria specified by the system operator.

18

Condensing flow of wet steam inside horizontal tubes

Madejski J.

Archives of Thermodynamics

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2001

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Vol. 22, nr 1-2

5-10

EN

This paper is a continuation of the author's devoted to the condensing flow of dry saturated steam. It is argued that flow of droplets can be treated separately because the deposition on liquid film can be neglected.

19

Mechanizmy zmiany skoku w locie dla łopat oscyloptera

Madejski J.

Zeszyty Naukowe Instytutu Maszyn Przepływowych Polskiej Akademii Nauk w Gdańsku

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2000

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nr 511/1470

1--15

20

Condensation in flow through horizontal tubes

Madejski J.

Archives of Thermodynamics

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2000

|

Vol. 21, nr 3-4

99-116

EN

Heat transfer and pressure drop in horizontal tubes in which condensation takes place is studied on this paper. The theory of condensate flow in the 3-D film under the influence of gravity and axial shear stress is given. Such condensers are widely used in refrigeration units. A numerical example shows that they can be used also in steam power plants.