a borítólapra  Súgó epa Copyright 
Acta polytechnica HungaricaVolume 5, Issue No. 2 (2008.)


  • Baltazar Frankovič ,
    Tung-T. Dang ,
    Ivana Budinská :
    Agents’ Coalitions Based on a Dynamic Programming Approach5-21en [253.40 kB - PDF]EPA-02461-00014-0010

    Abstract: Cooperation among agents is a very actual problem, which is a focus of lots papers published recently. The main purpose of cooperation is to improve each agent’s execution or whole execution of agents’ society and it depends strongly on concrete kinds of agents and a situation in which the agents are situated. Moreover, agents’ intelligence and their relationship also influence lots to cooperation process, mainly, when the agents’ society is huge or composed from a variety different agents. In this paper we focus to a problem how to create optimal coalitions among the given agents, where a coalition is a one of possible forms for cooperation and in which the common goal has highest priority for all the agents creating this coalition. Further, we will introduce methods, which are able to guarantee sub-optimal solutions by reducing a search space and estimate the domain, where the optimal solution possibly could be. In the end we will discuss about a problem of creating coalition with more parameters.

    Keywords: Agents, Cooperation, Coalition, Optimization and Multi-Agent Systems

  • Tivadar Lohner ,
    Miklós Serényi ,
    Dipak K. Basa ,
    Nquyen Quoc Khánh ,
    Ákos Nemcsics ,
    Péter Petrik ,
    Péter Túrmezei :

    Abstract: Because the composition and the thickness of the thin films are very important for the fabrication of the devices, in this study we have undertaken the determination of the composition and the thickness of the RF sputtered amorphous silicon alloy thin films deposited at room temperature under very different preparation conditions by using various techniques. Incorporation of argon is demonstrated in the room temperature deposited films and the thickness of the films measured by different methods such as Rutherford backscattering, spectroscopicellipsometry and step-profiler are found to be in reasonable agreement with each other.

    Keywords: amorphous Si alloys, Sputtering, RBS, Ellipsometry

  • Martin Tomáąek :
    Computational Environment of Software Agents31-41en [138.20 kB - PDF]EPA-02461-00014-0030

    Abstract: Presented process calculus for software agent communication and mobility can be used to express distributed computational environment and mobile code applications in general. Agents are abstraction of the functional part of the system architecture and they are modeled as process terms. Agent actions model interactions within the distributed environment: local/remote communication and mobility. Places are abstraction of the single computational environment where the agents are evaluated and where interactions take place. Distributed environment is modeled as a parallel composition of places where each place is evolving asynchronously. Operational semantics defines rules to describe behavior within the distributed environment and provides a guideline for implementations. Via a series of examples we show that mobile code applications can be naturally modeled.

    Keywords: software agent, multi-agent system, mobile code, communication, process calculus, mobile agent

  • András Farkas ,
    Viktor Nagy :

    Abstract: The importance rating of the technical skills and their related knowledge of industrial engineering and business management graduates are developed. A survey was conducted at the Faculty of Economics of the Budapest Tech to measure and evaluate 17 technical skills required by employers. The study utilized questionnaires to rate and rank these skills based on student assessment. The research was supported by a multivariate statistical method referred to as correspondence analysis. Details of the mathematical background of this method and the interpretation of the findings are also discussed.

    Keywords: correspondence analysis, survey method, importance ranking

  • Frantiąek Durovský ,
    Ladislav Zboray ,
    ®elmíra Ferková :
    Computation of Rolling Stand Parameters by Genetic Algorithm59-70en [245.05 kB - PDF]EPA-02461-00014-0050

    Abstract: Mathematical model of rolling process is used at cold mill rolling on tandem mills in metallurgy. The model goal is to analyse rolling process according to process data measured on the mill and get immeasurable variables necessary for rolling control and optimal mill pre-set for next rolled coil. The values obtained by model are used as references for superimposed technology controllers (thickness, speed, tension, etc.) as well. Considering wide steel strip assortment (different initial and final thickness, different hardness), and fluctuation of tandem mill parameters (change of friction coefficient, work rolls abrasion, temperature fluctuation, etc.) the exact analysis of tandem is complicated. The paper deals with an identification of friction coefficient on a single rolling mill stand by a genetic algorithm. Mathematical description of tandem mill stand is based on the modified Bland-Ford model. Results are presented in graphical form.

    Keywords: cold rolling, Bland-Ford model, mathematical model, genetic algorithm

  • Péter Várlaki ,
    László Nádai ,
    József Bokor :

    Abstract: In this paper we analyze in detail the central role of number ‘137’, the so-called Fine Structure Constant in the collaboration of Pauli and Jung. First, we present the fascination or the obsession of Pauli for the interpretation of number ‘137’. Second, we treat the spontaneous messages originating from unconscious concerning number ‘137’ in the wellknown dreams of Pauli. We restrict our investigations to the dreams containing the especially important formulae of Fine Structure Constant (4π3 + π2 + π), and also that containing the so-called background models of mathematical control systems. Third, we shortly mention four of the numerous synchronicities arising during the Pauli–Jung collaboration.

  • Matej Dobąovic ,
    Martin Kratmüller :
    Control an Electromechanical System in the Real-Time Linux Environment105-112en [219.68 kB - PDF]EPA-02461-00014-0070

    Abstract: This article is concerned with possibilities of control in real-time using Real- Time Linux (RTL). It describes the control abilities of a Personal Computer (PC) with RTL operating system, cooperation with industrial control cards, the architecture of control software and possibilities of use in real applications. We are putting forward experience with a simple interconnection between the RTL kernel and a control card using the Comedi software package.

  • Olesya Ogorodnikova :
    Creating an Active Awareness System for Humans in Robotic Workcell113-126en [190.07 kB - PDF]EPA-02461-00014-0080

    Abstract: This article is devoted to the problem of human’s security and safety at the time of any interaction with robots. We already discussed robot system reliability in the previous paper [1], now we emphasize the role of attention and human awareness with respect to the robot’s performance in vicinity. We analyzed human’s cognitive and physical abilities in ambient environment perception with the aim at effective warning system implementation. We introduced warning system interface on the basis of vibrotactile cuing, proposed an algorithm for robot controller and interface that impart tactile and visual information to human basing on data acquired from external sensory unit.

    Keywords: Human-Robot Interaction,awareness, vibrotactile stimuli

  • Alice Horváth :
    Investigation of Failure Systems127-132en [54.17 kB - PDF]EPA-02461-00014-0090

    Abstract: In an earlier paper A. Horváth and A. Prékopa [3] applied the Boole-Bonferroni lower and upper bounds to determine the expected time to failure of systems. The main goal of this paper is to show that the so called hypermultitree bounds developed by J. Bukszár [1] also can be applied for investigation of the expected time to failure systems.

    Keywords: Boolean-Bonferroni bounds, hypermultitree bounds, time failor systems

  • Victoria Iordan ,
    Alexandru Cicortas :
    Ontologies used for Competence Management133-144en [74.73 kB - PDF]EPA-02461-00014-0100

    Abstract: Developing multi-agent systems requires an adequate modeling of knowledge in order that the agents and the human person are able to understand and accept the concepts of domain area in the same way. Ontologies allow developing an coherent framework for a specified domain. Based on the concepts used ant the relations between them, the agents are able to understand, reason and act in the domain in order to accomplish their goals and finally the system functions. Based on appropriate ontologies defined for a particular domain, a multi-agent system that allows managing, searching and matching the user competences with the existent competences is presented.

    Keywords: ontology, compentence modeling, multi-agent systems