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    Wyświetlanie 1-9 z 9
    Tytuł:
    Pointwise observation of the state given by complex time lag parabolic system
    Autorzy:
    Kowalewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/229580.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distributed control
    parabolic system
    time lags
    pointwise observation
    Opis:
    Various optimization problems for linear parabolic systems with multiple constant time lags are considered. In this paper, we consider an optimal distributed control problem for a linear complex parabolic system in which different multiple constant time lags appear both in the state equation and in the Neumann boundary condition. Sufficient conditions for the existence of a unique solution of the parabolic time lag equation with the Neumann boundary condition are proved. The time horizon T is fixed. Making use of the Lions scheme [13], necessary and sufficient conditions of optimality for the Neumann problem with the quadratic performance functional with pointwise observation of the state and constrained control are derived. The example of application is also provided
    Źródło:
    Archives of Control Sciences; 2017, 27, 1; 77-89
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Data processing in self-controlling enterprise processes
    Autorzy:
    Zaborowski, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/200356.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kontrola procesów w przedsiębiorstwie
    złożony system kontroli
    Przemysł 4.0
    stan procesu przedsiębiorstwa
    integracja przedsiębiorstwa
    enterprise process control
    complex control system
    Industry 4.0
    enterprise process state
    enterprise integration
    Opis:
    This study presents cause-effect dependencies between inputs and outputs of business transitions that are software objects designed for processing information-decision state variables in integrated enterprise process control (EntPC) systems. Business transitions are elementary components of controlling units in enterprise processes that have been defined as self-controlling, generalized business processes, which may serve not only as business processes but also as business systems or their roles. Business events, which have zero durations by definition, are interpreted as executions of business actions that are main operations of business transitions. Any ordered set of business actions, performed in the controlling unit of a given enterprise process and attributed to the same discrete-time instant, is referred to as ‘the information-decision process’. The i-d processes may be substituted by managerial business processes, performed on the lower organizational level, where durations of activity executions are greater than zero, but discrete-time periods are considerably shorter. In such a case, procedures of business actions are performed by corresponding activities of managerial processes, but on the level of business transitions the durations of their executions are imperceptible, and many different business events may occur at the same discrete-time instant. It has been demonstrated in the paper how to control business actions to ensure that a given i-d state variable may not change more than once at a given instant. Furthermore, the rules of designing the i-d process structures, which prevent random changes of transitory states, have been presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 3-20
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust diagnostics of complex chemical processes: main problems and possible solutions
    Autorzy:
    Kościelny, J. M.
    Syfert, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185748.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    complex systems
    diagnostic system
    alarm systems
    diagnosis robustness
    diagnostic inference
    złożone systemy
    system diagnostyczny
    systemy alarmowe
    wnioskowanie diagnostyczne
    Opis:
    The paper is aimed at presenting a study of the main limitations and problems influencing the robustness of diagnostic algorithms used in diagnostics of complex chemical processes and to present the selected exemplary solutions of how to increase it. The five major problems were identified in the study. They are associated with: uncertainties of fault detection and reasoning, changes of the diagnosed process structure, delays of fault symptoms formation and multiple faults. A brief description and exemplary solutions allowing increase of the robustness of diagnostic algorithms were given. Proposed methods were selected keeping in mind applicability for the on-line monitoring and diagnostics of complex chemical processes.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 2; 165--183
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some aspects of modeling and analysis of complex biological systems using time Petri nets
    Autorzy:
    Olszak, J.
    Radom, M.
    Formanowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/199770.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    time Petri nets
    t-invariants
    biological system
    system biologiczny
    czasowe sieci Petriego
    inwariant
    Opis:
    Models of complex biological systems can be built using different types of Petri nets. Qualitative nets, for example, can be successfully used to obtain a model of such a system and on its basis a structure-based analysis can be performed. Time is an important factor influencing a whole biological system behaviour and in many cases it should be considered during building a model of such a system. In this paper various types of time Petri nets have been described and methods for studying corresponding models have been discussed. In particular, an algorithm using time parameters to enhance t-invariants based analysis is proposed. This algorithm allows for calculation of the minimal and maximal numbers of tokens (respectively, for an optimistic and pessimistic case) in particular places necessary to assure that all transitions from a given t-invariant support will be able to fire. Additionally, to address the problem of the proper assignment of time values to transitions, the known methods for calculation and evaluation of such time parameters based on the net structure have also been discussed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 67-78
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pinning synchronization of the drive and response dynamical networks with lag
    Autorzy:
    Wen, B.
    Zhao, M.
    Meng, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/229648.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    complex networks
    lag synchronization
    pinning control
    Lorenz system
    Opis:
    This paper investigates the pinning synchronization of two general complex dynamical networks with lag. The coupling configuration matrices in the two networks are not need to be symmetric or irreducible. Several convenient and useful criteria for lag synchronization are obtained based on the lemma of Schur complement and the Lyapunov stability theory. Especially, the minimum number of controllers in pinning control can be easily obtained. At last, numerical simulations are provided to verify the effectiveness of the criteria.
    Źródło:
    Archives of Control Sciences; 2014, 24, 3; 257-270
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Networked object monitor - a distributed system for monitoring, diagnostics and control of complex industrial facilities
    Autorzy:
    Kowalczuk, Z.
    Wszołek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221739.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diagnostics of industrial facilities
    diagnostic service bus
    network object monitor
    Opis:
    The paper puts forward a method of designing and creating a complete computer system for monitoring and diagnosis of business and industrial facilities, as well as for control purposes. The proposed solution represents a computer-network system being a practical tool for communication, control and management of modern plants and enterprises. The applied concept of communication, based on the Service Oriented Architecture (SOA), makes a new attempt to solve certain performance problems met when using a (previously developed) Networked Object Monitor (NOM). The principal idea of increasing the performance of NOM lies in employing a common data bus, refereed to as a Diagnostic Service Bus (DSB), in the NOM monitor. The paper also describes a preliminary concept of a network description language (SMOL), which is designed to describe the functions, mechanisms, and network devices and to be a basis for simulation and verification of the NOMmonitor function.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 3; 521-530
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Safety management of complex airborne and seaborne technical objects
    Zarządzanie bezpieczeństwem złożonych obiektów technicznych powietrznych i morskich
    Autorzy:
    Gerigk, M.
    Skorupski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/224158.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bezpieczeństwo
    system bezpieczeństwa
    transport lotniczy
    transport morski
    ocena bezpieczeństwa
    ocena ryzyka
    model ryzyka
    safety management
    safety system
    seaborne transportation
    risk assessment
    Opis:
    The paper presents some information on a concept of the safety management method of the complex airborne and seaborne technical objects. First of all the differences in safety management in both the seaborne transportation and airborne transportation are introduced. Then the safety system which may be applied for the complex technical objects is described. Next the method for safety assessment of the complex technical airborne and seaborne objects based on the risk assessment is presented. Then the chosen elements of the risk model are described. In the final part of paper the proposed method of safety management of the complex technical objects devoted to the seaborne and airborne applications is introduced. Finally the conclusions are given.
    W artykule przedstawiono wybrane informacje na temat koncepcji metody zarządzania bezpieczeństwem złożonych obiektów technicznych powietrznych i morskich. W pierwszej części artykułu omówiono różnice dotyczące zarządzania bezpieczeństwem w transporcie lotniczym i morskim. Następnie przedstawiono system bezpieczeństwa, który można zastosować w przypadku złożonych obiektów technicznych. Potem opisano metodę oceny bezpieczeństwa złożonych obiektów technicznych opartą na ocenie ryzyka. Z kolei opisano wybrane elementy proponowanego modelu ryzyka. W końcowej części artykułu przedstawiono proponowaną metodę zarządzania bezpieczeństwem złożonych obiektów technicznych, ukierunkowaną na zastosowania w transporcie lotniczym i morskim. Na zakończenie podano wnioski wynikające z dotychczasowych badań.
    Źródło:
    Archives of Transport; 2012, 24, 3; 285-296
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occurrence and pathogenicity of fungi from Gaeumannomyces-phialophora complex isolated from winter wheat seedlings
    Autorzy:
    Maczynska, A.
    Sikora, H.
    Krzyzinska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/66142.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    root system
    Phialophora
    wheat
    pathogenicity
    Gaeumannomyces graminis
    seedling
    fungi
    occurrence
    winter wheat
    Fusarium
    Źródło:
    Journal of Plant Protection Research; 2002, 42, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of operability of Peltier modules in cooling systems based on the analysis of transient operating modes
    Autorzy:
    Kuzichkin, Oleg Rudolfovich
    Konstantinov, Igor Sergeevich
    Vasilyev, Gleb Sergeevich
    Surzhik, Dmitry Igorevich
    Powiązania:
    https://bibliotekanauki.pl/articles/1845461.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelectric system
    agriculture
    complex
    transients
    peltier effect
    identification algorithms
    Opis:
    The paper is devoted to the control of operability of Peltier modules based on the analysis of transient modes of their operation. Advantages of using low-power thermoelectric modules for the development of thermoelectric plants with adaptive control systems for the needs of the agricultural complex, which significantly reduce their cost characteristics, are shown. The problem of using the stationary mode of their operation, associated with the low efficiency of the modules, as well as the dynamic mode, associated with the presence of transient processes, is indicated. It is noted that overcoming this problem requires solution of the task of automation of reliability providing the well-known approaches to its solution are shown, for which the key advantages and disadvantages are given. An approach is proposed to complex control of the operability and quality of thermoelectric modules during their expluatation in three components of the physical process of thermoelectric conversion (Peltier thermoelectric effect, electrical and thermal transfer phenomena) by analyzing transients in the system based on identification algorithms. To justify it, the necessary equations and mathematical relations are given. Aprobating of the proposed approach was carried out experimentally by determining the time constants for operable and defective commercially available modules and showed its significant advantages over the standard verification procedure.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 2; 31-42
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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