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    Wyświetlanie 1-41 z 41
    Tytuł:
    Ensuring Organisational Security from the Perspective of Security Sciences
    Autorzy:
    Płonka, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/1808093.pdf
    Data publikacji:
    2019-04-11
    Wydawca:
    Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
    Tematy:
    organisational security
    control models
    risk analysis
    Opis:
    This paper is dedicated to the topic of security in the context of activities carried out by organisations. The analysis of the security-related context of the enterprises, decisions and threats that often co-occur with organisational activities is an interesting challenge for a researcher. The aspiration to ensure their own survival and undisturbed development is the basic driving force behind all organisations. In the following paper, the author explains the meaning of basic terms connected with the aforementioned issues, such as uncertainty, risk and security. The models and dimensions of control are discussed consecutively, as well as the methods and techniques utilised in risk assessment. Control and risk analysis are currently the means of counteracting threats that is most commonly used in organisations. The aim of the paper is to carry out the review of the hitherto existing research stipulations regarding the sphere of organisational security. The author points out that the problem of organisational security, treated as a core research subject, may be successfully developed and elaborated within the framework of security sciences discipline.
    Źródło:
    Security Dimensions; 2018, 28(28); 122-140
    2353-7000
    Pojawia się w:
    Security Dimensions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Illegal Wildlife Trade in Poland – Crime Control Models
    Autorzy:
    Drzazga, Edyta
    Powiązania:
    https://bibliotekanauki.pl/articles/28678375.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    illegal wildlife trade
    green criminology
    social control models
    crime control
    Opis:
    Wildlife traffickindg of endangered species is an international crime that is increasing in in terms of its significance and position in the global crime hierarchy. This phenomenon is a significant subject of research for both traditional and green criminology. The representatives of green criminology, when discussing the criminal policy in matters related to green crimes, refer to its broad meaning. From this perspective, “green criminal policy” includes: a) the legal and social approach, b) a regulatory system that emphasizes social arrangements, norms and reforms in the production and consumption system; and c) a system of social interactions. Each of these models is presented in the article. In this context, the results of qualitative research on the state of the social control of illegal trade in wild fauna and flora in Poland will also be cited.
    Źródło:
    Adam Mickiewicz University Law Review; 2022, 14; 321-337
    2450-0976
    Pojawia się w:
    Adam Mickiewicz University Law Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and design of role engineering in development of access control for dynamic information systems
    Autorzy:
    Poniszewska-Marańda, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200307.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    access control of information systems
    access control models
    role engineering
    usage control
    Opis:
    Nowadays, the growth and complexity of functionalities of current information systems, especially dynamic, distributed and heterogeneous information systems, makes the design and creation of such systems a difficult task and at the same time, strategic for businesses. A very important stage of data protection in an information system is the creation of a high level model, independent of the software, satisfying the needs of system protection and security. The process of role engineering, i.e. the identification of roles and setting up in an organization is a complex task. The paper presents the modeling and design stages in the process of role engineering in the aspect of security schema development for information systems, in particular for dynamic, distributed information systems, based on the role concept and the usage concept. Such a schema is created first of all during the design phase of a system. Two actors should cooperate with each other in this creation process, the application developer and the security administrator, to determine the minimal set of user’s roles in agreement with the security constraints that guarantee the global security coherence of the system.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 569-579
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semi-Markov control models with average costs
    Autorzy:
    Luque-Vásquez, Fernando
    Hernández-Lerma, Onésimo
    Powiązania:
    https://bibliotekanauki.pl/articles/1338792.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    average cost
    replacement models
    semi-Markov control models
    policy iteration (or Howard's algorithm)
    Opis:
    This paper studies semi-Markov control models with Borel state and control spaces, and unbounded cost functions, under the average cost criterion. Conditions are given for (i) the existence of a solution to the average cost optimality equation, and for (ii) the existence of strong optimal control policies. These conditions are illustrated with a semi-Markov replacement model.
    Źródło:
    Applicationes Mathematicae; 1999, 26, 3; 315-331
    1233-7234
    Pojawia się w:
    Applicationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global flow stability analysis and reduced order modeling for bluff-body flow control
    Globalna analiza stabilności i modelowanie niskowymiarowe w zastosowaniu do sterowania opływem ciał
    Autorzy:
    Morzyński, M.
    Noack, B. R.
    Tadmor, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/279218.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Reduced Order Models
    control-oriented models
    global flow stability
    flow control
    continuous mode interpolation
    Opis:
    In the present study, a hierarchy of control-oriented reduced order models (ROMs) for fluid flows is presented. Control design requires simplicity, accuracy and robustness from an online capable Galerkin model. These requirements imply low order of the associated dynamical system. Standard POD (praper orthogonal decomposition) Galerkin models may provide a low-dimensional representation of a given reference state. Yet, their narrow dynamic range and lack of robustness pose a challenge for control design. We propose key enablers to increase the dynamic range of the POD model. An 11-dimensional hybrid model is discussed which includes, in addition to 8 POD modes, a shift mode to resolve base-flow variations, and a complex global stability mode for enhanced description of the transient phase. The dimension is further reduced by a similarly accurate 3-dimensional generalized mean-field model employing a novel continuous mode interpolation technique between POD and stability eigenmodes. This method connects smoothly different operating conditions, different mode bases and even different boundary conditions, allowing the design of least-order, accurate Galerkin model for flow control purposes. The interpolation technique is employed to construct a priori flow model from the stability analysis and the Reynolds equation without the need for flow data.
    W pracy przedstawiono grupę modeli niskowymiarowych przeznaczoną do sterowania opływem ciał. Wymagania dotyczące modelu, takie jak prostota, dokładność i odporność wymagają ograniczenia liczby wymiarów. Standardowe modele Galerkina oparte o mody POD okazują się nieprzydatne do projektowania kontrolera, stąd jako rozwiązanie problemu zaproponowano modele hybrydowe oparte o mody globalnej analizy stabilności, mody POD i mod przesunięcia. Dodatkowo zaprezentowano nową koncepcję interpolacji modów, przez co możliwa jest konstrukcja parametrycznego modelu przepływu charakteryzującego się najmniejszą z możliwych liczbą wymiarów i płynną zmianą w zależności od stanu sterowanego przepływu. Metoda ciągłej interpolacji modów została zastosowana do konstrukcji modelu a priori przepływu, opartego jedynie o mody globalnej analizy stabilności.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2007, 45, 3; 621-642
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimising a model of minimum stock level control and a model of standing order cycle in selected foundry plant
    Autorzy:
    Szymszal, J.
    Lis, T.
    Przondziono, J.
    Nowacki, K.
    Kliś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382979.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computer aiding
    foundry production
    logistics
    stock control models
    wspomaganie komputerowe
    produkcja odlewnicza
    logistyka
    sterowanie magazynem
    Opis:
    It has been found that the area where one can look for significant reserves in the procurement logistics is a rational management of the stock of raw materials. Currently, the main purpose of projects which increase the efficiency of inventory management is to rationalise all the activities in this area, taking into account and minimising at the same time the total inventory costs. The paper presents a method for optimising the inventory level of raw materials under a foundry plant conditions using two different control models. The first model is based on the estimate of an optimal level of the minimum emergency stock of raw materials, giving information about the need for an order to be placed immediately and about the optimal size of consignments ordered after the minimum emergency level has occurred. The second model is based on the estimate of a maximum inventory level of raw materials and an optimal order cycle. Optimisation of the presented models has been based on the previously done selection and use of rational methods for forecasting the time series of the delivery of a chosen auxiliary material (ceramic filters) to a casting plant, including forecasting a mean size of the delivered batch of products and its standard deviation.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 97-100
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors Determining a Drone Swarm Employment in Military Operations
    Autorzy:
    Zieliński, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2010540.pdf
    Data publikacji:
    2021
    Wydawca:
    Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
    Tematy:
    autonomy
    capabilities of drone swarm
    command and control models
    defense
    drone swarm
    military operations
    unmanned aerial vehicle
    autonomia
    dron
    modele dowodzenia
    modele kontroli
    obrona
    rój dronów
    operacje wojskowe
    bezzałogowy statek powietrzny
    Opis:
    The aim of this study is to identify a drone swarm’s capabilities and the key factors influencing its employment in military operations. The research takes the quantitative analysis of scientific literature related to the technical and operational utilization of drones. The use of drones for military purposes in contemporary world is widespread. They conduct dull, dirty, dangerous and deep military operations replacing manned aviation in many areas. Progressive technological development including artificial intelligence and machine learning allows for the use of military drones in the form of a swarm. It is a quite new technology at the beginning of development. The study indicates that the capabilities of a drone swarm based on communication within the group and autonomy differentiate it from the typical use of unmanned aircraft. Size, diversity, self-configurability and self-perfection amongst the others indicated in literature are attributes of a drone swarm which may give advantage in military operation comparing to the classic use of unmanned aircraft. Emergent coordination as a command and control model of a drone swarm is a future way of utilizing that technology in military operations. In the future, a drone swarm will be a cheaper equivalent of advanced and much more expensive weapon systems conducting combat operations.
    Źródło:
    Safety & Defense; 2021, 1; 59-71
    2450-551X
    Pojawia się w:
    Safety & Defense
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the application of control models technique to investigation of some ecological and economic problems
    Autorzy:
    Blizorukova, M.
    Maksimov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/229496.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    controlled models
    identification
    robust control
    Opis:
    The paper discusses a method of auxiliary controlled models and the application of this method to solving some problems of identification and robust control for differential equations. The objects that the method is suggested to be used are two systems of nonlinear differential equations describing some ecological and economic processes. Two solving algorithms, which are stable with respect to informational noises and computational errors, are presented. The algorithms are tested by model examples.
    Źródło:
    Archives of Control Sciences; 2012, 22, 4; 399-416
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient MPC algorithms with variable trajectories of parameters weighting predicted control errors
    Autorzy:
    Nebeluk, Robert
    Marusak, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/230077.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model predictive control
    nonlinear systems
    nonlinear models
    nonlinear control
    simulation
    optimization
    Opis:
    Model predictive control (MPC) algorithms brought increase of the control system performance in many applications thanks to relatively easily solving issues that are hard to solve without these algorithms. The paper is focused on investigating how to further improve the control system performance using a trajectory of parameters weighting predicted control errors in the performance function of the optimization problem. Different shapes of trajectories are proposed and their influence on control systems is tested. Additionally, experiments checking the influence of disturbances and of modeling uncertainty on control system performance are conducted. The case studies were done in control systems of three control plants: a linear non-minimumphase plant, a nonlinear polymerization reactor and a nonlinear thin film evaporator. Three types of MPC algorithms were used during research: linear DMC, nonlinear DMC with successive linearization (NDMC–SL), nonlinear DMC with nonlinear prediction and linearization (NDMC–NPL). Results of conducted experiments are presented in greater detail for the control system of the polymerization reactor, whereas for the other two control systems only the most interesting results are presented, for the sake of brevity. The experiments in the control system of the linear plant were done as preliminary experiments with the modified optimization problem. In the case of control system of the thin film evaporator the researched mechanisms were used in the control system of a MIMO plant showing possibilities of improving the control system performance.
    Źródło:
    Archives of Control Sciences; 2020, 30, 2; 325-363
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real-time implementation of multiple model based predictive control strategy to air/fuel ratio of a gasoline engine
    Autorzy:
    Wojnar, S
    Polóni, T
    Šimončič, P
    Rohal’-Ilkiv, B
    Honek, M
    Csambál, J
    Powiązania:
    https://bibliotekanauki.pl/articles/229632.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model predictive control
    multiple models
    air/fuel ratio
    spark ignition engine
    ARX models
    Opis:
    Growing safety, pollution and comfort requirements influence automotive industry ever more. The use of three-way catalysts in exhaust aftertreatment systems of combustion engines is essential in reducing engine emissions to levels demanded by environmental legislation. However, the key to the optimal catalytic conversion level is to keep the engine air/fuel ratio (AFR) at a desired level. Thus, for this purposes more and more sophisticated AFR control algorithms are intensively investigated and tested in the literature. The goal of this paper is to present for a case of a gasoline engine the model predictive AFR controller based on the multiple-model approach to the engine modeling. The idea is to identify the engine in particular working points and then to create a global engine's model using Sugeno fuzzy logic. Opposite to traditional control approaches which lose their quality beside steady state, it enables to work with satisfactory quality mainly in transient regimes. Presented results of the multiple-model predictive air/fuel ratio control are acquired from the first experimental real-time implementation on the VW Polo 1390 cm3 gasoline engine, at which the original electronic control unit (ECU) has been fully replaced by a dSpace prototyping system which execute the predictive controller. Required control performance has been proven and is presented in the paper.
    Źródło:
    Archives of Control Sciences; 2013, 23, 1; 93-106
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Singular controls and chattering arcs in optimal control problems arising in biomedicine
    Autorzy:
    Ledzewicz, U.
    Schattler, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/970774.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    optimal control
    singular controls
    biomedical models
    anti-angiogenesis
    Opis:
    We consider an optimal control problem of the Mayer-type for a single-input, control affine, nonlinear system in small dimension. In this paper, we analyze effects that a modeling extension has on the optimality of singular controls when the control is replaced with the output of a first-order, time-invariant linear system driven by a new control. This analysis is motivated by an optimal control problem for a novel cancer treatment method, tumor anti-angiogenesis, when such a linear differential equation, which represents the pharmacokinetics of the therapeutic agent, is added to the model. We show that formulas that define a singular control of order 1 and its associated singular arc carry over verbatim under this model extension, albeit with a different interpretation. But the intrinsic order of the singular control increases to 2. As a, consequence, optimal concatenation sequences with the singular control change and the possibility of optimal chattering arcs arises.
    Źródło:
    Control and Cybernetics; 2009, 38, 4B; 1501-1523
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Współdziałanie regulacji predykcyjnej i bieżącej optymalizacji punktu pracy w strukturach sterowania z modelami Wienera
    Cooperation of predictive control and set-point optimisation in control structures with Wiener models
    Autorzy:
    Ławryńczuk, M.
    Marusak, P.
    Tatjewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/275539.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    struktury sterowania
    modele Wienera
    control structures
    Wiener models
    Opis:
    Numerycznie efektywne struktury sterowania alternatywne do klasycznej, warstwowej struktury sterowania są przedmiotem badań. W pierwszej strukturze dodano pomocnicze, liniowe zadanie optymalizacji punktu pracy. W drugiej strukturze, zadania optymalizacji punktu pracy i regulacji predykcyjnej są integrowane w jednym zadaniu optymalizacji kwadratowej. Użycie w tych strukturach modelu Wienera dodatkowo je upraszcza dzięki możliwości łatwego otrzymania liniowych aproksymacji dynamiki i statyki procesu.
    Two numerically efficient control system structures alternative to the classical one are considered. In the first one the supplementary Steady State Target Optimization (SSTO) is performed at each sampling instant. In the second one set-point optimization and predictive control are integrated into one optimization task. In the proposed approaches, thanks to using a Wiener process model, both predictive control and set-point optimization problems are simplified. Using the nonlinear model a linear dynamic and linear static approximations are easily obtained and used both for set-point optimization and predictive control.
    Źródło:
    Pomiary Automatyka Robotyka; 2010, 14, 2; 470-480
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulational study of a hydraulicly driven parallel manipulator control system
    Autorzy:
    Frączek, J.
    Wojtyra, M.
    Dayliakos, I.
    Papadopoulos, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/243340.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    robotics
    control
    dynamics
    simulation
    parallel manipulators
    inverse dynamics models
    Opis:
    A simulational model of 6 dof Stewart platform type parallel manipulator is presented. The manipulator is driven by electrohydraulic actuators. The developed control scheme employs the dynamic and hydraulic model of the system. The manipulator model consists of the rigid body equations of motion and the hydraulic dynamics of the main elements. Friction is included in the model. Two well-known software packages, one designed to perform control system simulation and the other dedicated to multibody simulation, are simultaneously used to conduct the study. The aim of the study is to check if it is the impact of dynamics model accuracy on the quality of control process. The simplifications of the model and the problems with finding accurate values of its parameters (especially friction parameters) are considered. The study helps to predict the possible results of inaccurate determination of the crucial model parameters. The simulation results show, that inverse dynamics model simplifications consisting in neglecting the mass of actuators have relatively little influence on the control quality. The effects of actuators masses neglecting can be reduced by appropriate changes in the modelled mass of the platform. The study shows that friction effects should be introduced to the inverse dynamics model and the friction parameters should be identified with possibly big accuracy. The parameters describing stiction-friction transition effects are the crucial ones.
    Źródło:
    Journal of KONES; 2008, 15, 1; 51-67
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elman neural network for modeling and predictive control of delayed dynamic systems
    Autorzy:
    Wysocki, A.
    Ławryńczuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/229646.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic models
    process control
    model predictive control
    neural networks
    Elman neural network
    delayed systems
    Opis:
    The objective of this paper is to present a modified structure and a training algorithm of the recurrent Elman neural network which makes it possible to explicitly take into account the time-delay of the process and a Model Predictive Control (MPC) algorithm for such a network. In MPC the predicted output trajectory is repeatedly linearized on-line along the future input trajectory, which leads to a quadratic optimization problem, nonlinear optimization is not necessary. A strongly nonlinear benchmark process (a simulated neutralization reactor) is considered to show advantages of the modified Elman neural network and the discussed MPC algorithm. The modified neural model is more precise and has a lower number of parameters in comparison with the classical Elman structure. The discussed MPC algorithm with on-line linearization gives similar trajectories as MPC with nonlinear optimization repeated at each sampling instant.
    Źródło:
    Archives of Control Sciences; 2016, 26, 1; 117-142
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O optymalizacji procedury Slifkera i Shapiro estymacji krzywych Johnsona
    Optimization of Procedure Slifker and Shapiro for Johnson Curves Estimation
    Autorzy:
    Peternek, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/586570.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Karty kontrolne
    Modele optymalizacyjne
    Statystyczne Sterowanie Procesem
    Sterowanie jakością
    Control charts
    Optimizing models
    Quality control
    Statistic process control (SPC)
    Opis:
    In the statistical process control the assumption of normal distribution is widely used. But in practical this assumption is often unfulfilled. In this situation appropriate transformation or nonclassical method should be used. The most commonly used methods of transformation are the curves Johnson. The most important problem with the use of Johnson curves is estimation of parameter and form of curves. This paper presents improvement of Slifker and Shapiro procedure (1980) by construction of optimization model based on chi-square statistic.
    Źródło:
    Studia Ekonomiczne; 2014, 203; 114-124
    2083-8611
    Pojawia się w:
    Studia Ekonomiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emotional learning based intelligent speed and position control applied to neurofuzzy model of switched reluctance motor
    Autorzy:
    Rouhani, H.
    Sadeghzadeh, A.
    Lucas, C.
    Araabi, B. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/969753.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    intelligent control
    emotion based learning
    neuro-fuzzy models
    switched reluctance motor
    Opis:
    In this paper, rotor speed and position of a Switched Reluctance Motor (SRM) are controlled using an intelligent control algorithm. The controller is working based on a PID signal while its gain is permanently tuned by means of an Emotional Learning Algorithm to achieve a better control performance. Here, nonlinear characteristic of SRM is identified using an efficient training algorithm (LoLiMoT) for Locally Linear Neurofuzzy Model as an unspecified nonlinear plant model. Then, the Brain Emotional Learning Based Intelligent Controller (BELBIC) is applied to the obtained model. While the intelligent controller works based on a computational model of a limbic system in the mammalian brain, its contribution is to improve the performance of a classic controller like PID without much more control effort. The results demonstrate excellent improvements of control action in different working situations.
    Źródło:
    Control and Cybernetics; 2007, 36, 1; 75-95
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observer design estimating the propofol concentration in PKPD model with feedback control of anesthesia administration
    Autorzy:
    Ilyas, Muhammad
    Khan, Awais
    Khan, Muhammad Abbas
    Xie, Wei
    Riaz, Raja Ali
    Khan, Yousaf
    Powiązania:
    https://bibliotekanauki.pl/articles/2106507.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pharmacokinetic models
    pharmacodynamic model
    bispectral index monitor
    observer design
    sliding mode control
    Opis:
    Propofol infusion in anesthesia administration requires continual adjustment in the manual infusion system to regulate the hypnosis level. Hypnotic level is based on Bispectral Index Monitor (BIS) showing the cortical activity of the brain scaled between 0 to 100. The new challenging aspect of automation in anaesthesia is to estimate the concentration of hypnotic drugs in different compartments of the body including primary, rapid peripheral (muscle), slow peripheral (bones, fat) and effect site (brain) compartment based on Pharmacokinetics (PK) and Pharmacodynamics (PD) model. This paper aimed to regulate the hypnosis level with estimating the Propofol concentrations using a linear observer in feedback control strategy based on Integral Super-Twisting Sliding Mode Controller (ISTSMC). The drug concentration in plasma of the silico patients accurately estimated in nominal transient. The results show that tracking errors between the actual output in form of BIS level and linearized output nearly approaches to zero in the maintenance phase of anesthesia to ensure the controller response on sliding phase with optimum performances by achieving desired hypnotic level 50 on BIS. The robustness of control strategy is further ensured by adding measurement noise of electromagnetic environment of operation theatre distracting signal quality index of the output BIS level.
    Źródło:
    Archives of Control Sciences; 2022, 32, 1; 85--103
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania symulacyjne rozruchu silnika indukcyjnego steru strumieniowego statku
    Simulation investigation of starting an induction motor of ship thrusters
    Autorzy:
    Arendt, R.
    Kopczyński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/277312.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    modele matematyczne
    badania symulacyjne
    algorytmy sterowania
    mathematical models
    simulation research
    control algorithms
    Opis:
    W artykule przedstawiono możliwości zastosowania modeli matematycznych elementów składowych steru strumieniowego statku oraz wykorzystania badań symulacyjnych przy doborze algorytmów sterowania. Przedstawione procedury oraz modele matematyczne zostaną włączone do systemu ekspertowego wspomagającego projektowanie statków.
    This paper deals with the problem of mathematical models applications of component elements of ship thrusters and simulations at a choice of control algorithms. The design procedures and mathematical models will be used in expert system for aided design of ship power systems.
    Źródło:
    Pomiary Automatyka Robotyka; 2011, 15, 2; 697-706
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Współbieżne modele czasu rzeczywistego przekształtników energoelektronicznych w kształceniu inżynierskim
    Simultaneous Real-Time Models of Power Electronics Converters
    Autorzy:
    BINKOWSKI, TOMASZ
    KWIATKOWSKI, BOGDAN
    Powiązania:
    https://bibliotekanauki.pl/articles/455388.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    energoelektronika
    przekształtnik
    sterowanie
    modele czasu rzeczywistego
    power electronics
    converter
    control
    real-time models
    Opis:
    Badanie układów energoelektronicznych zarówno do celów dydaktycznych, jak i naukowych wymaga przeprowadzania testów układów sterowania i regulacji. Testy te nie zawsze kończą się sukcesem, zwłaszcza w sytuacji nieprzewidzianych zdarzeń lub niewłaściwie dobranych parame-trów sterowania. W przypadku stanowiska laboratoryjnego ewentualne zwarcia lub błędy mogą skutkować zniszczeniem wrażliwych, kosztownych elementów. W artykule przedstawiono koncepcję stanowiska laboratoryjnego przeznaczonego do fazy prototypowania, które w czasie rzeczywistym wykonywało współbieżnie obliczenia modeli przekształtników energoelektronicznych i realizowało zadania sterowania.
    The power electronics converters study, both for the purposes of teaching and scientific research, requires the testing of control systems and regulations. These tests do not always end with success, especially in a situation not provided for events or inappropriately selected control parameters. In the case of a laboratory station possible short circuits or errors can result in the destruction of sensitive, costly items. The article shows the concept of a laboratory station intended for prototyping phase, which in real time performed calculation in parallel of the power electronic converter models and provided the control tasks.
    Źródło:
    Edukacja-Technika-Informatyka; 2017, 8, 3; 269-275
    2080-9069
    Pojawia się w:
    Edukacja-Technika-Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal Control for a Class of Compartmental Models in Cancer Chemotherapy
    Autorzy:
    Świerniak, A.
    Ledzewicz, U.
    Schättler, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/908158.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    medycyna
    matematyka
    compartmental models
    cancer chemotherapy
    optimal control
    necessary and sufficient conditions for optimality
    Opis:
    We consider a general class of mathematical models P for cancer chemotherapy described as optimal control problems over a fixed horizon with dynamics given by a bilinear system and an objective which is linear in the control. Several two- and three-compartment models considered earlier fall into this class. While a killing agent which is active during cell division constitutes the only control considered in the two-compartment model, Model A, also two three-compartment models, Models B and C, are analyzed, which consider a blocking agent and a recruiting agent, respectively. In Model B a blocking agent which slows down cell growth during the synthesis allowing in consequence the synchronization of the neoplastic population is added. In Model C the recruitment of dormant cells from the quiescent phase to enable their efficient treatment by a cytotoxic drug is included. In all models the cumulative effect of the killing agent is used to model the negative effect of the treatment on healthy cells. For each model it is shown that singular controls are not optimal. Then sharp necessary and sufficient optimality conditions for bang-bang controls are given for the general class of models P and illustrated with numerical examples.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2003, 13, 3; 357-368
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time series analysis in environmental epidemiology: challenges and considerations
    Autorzy:
    Gudziunaite, Sandra
    Shabani, Zana
    Weitensfelder, Lisbeth
    Moshammer, Hanns
    Powiązania:
    https://bibliotekanauki.pl/articles/23364734.pdf
    Data publikacji:
    2023-12-15
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    statistical methods
    regression models
    environmental epidemiology
    short-term effects
    time series analyses
    confounder control
    Opis:
    In environmental epidemiology, time series analyses represent a widely used statistical tool. However, though being commonly used, there is soften confusion regarding the specific requirements, such as which link function might be most appropriate, when or how to control for seasonality or how to account for lags. The present overview draws from experiences in other disciplines and discusses the proper execution of time series analyses based on considerations that are relevant in environmental epidemiology. Time series analysis in environmental epidemiology focuses on acute events caused by short-term changes in exposure. These exposures should be fairly wide-spread affecting a large number of persons, usually all inhabitants of a political entity. Pollutants in air or drinking water as well as meteorological factors serve as typical examples. Despite the many time series analyses performed world-wide, some health effects that would lend themselves to that approach are still under-explored. This would include also some neurological and psychiatric endpoints.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2023, 36, 6; 704-716
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulating capture behaviour in 802.11 radio modems
    Autorzy:
    Ware, C.
    Wysocki, T. A.
    Chicharo, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/309552.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    wireless local area networks
    ad hoc networks
    capture models
    medium access control protocol
    fairness
    Opis:
    Simulation plays an important role in the performance evaluation of MAC protocols. Building simulation models which are able to accurately model physical behaviour is fundamental to the outcome of such techniques. Through both qualitative and quantitative comparison of experimental trace data against simulation results obtained using delay, power, and hybrid capture models, this paper investigates the performance of various packet capture models in the simulation analysis of the 802.11 PHY and MAC layer protocols. We illustrate these models are unable to accurately describe the fairness properties of the experimental data. A new model is proposed, Message Retraining, to describe the operation of an 802.11 receiver. We illustrate that the Message Retraining reception model is able to model the fairness characteristics obtained with an IEEE 802.11 radio modem more accurately than the previous capture models.
    Źródło:
    Journal of Telecommunications and Information Technology; 2001, 3; 46-54
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of output conductance on characteristic frequencies of switch mode BUCK and BOOST converter
    Autorzy:
    Janke, W.
    Walczak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140387.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pulse converters
    BUCK
    BOOST
    small-signal models
    control-to-output
    characteristics
    DCM boundary
    characteristic frequencies
    Opis:
    Characteristic frequencies corresponding to poles and zeros of small-signal control-to-output transfer functions of popular DC-DC converters (BUCK and BOOST) are analyzed. The main attention is paid to influence of load conductance on the characteristic frequencies for converters working in continuous conduction mode (CCM) as well as in discontinuous conduction mode (DCM). Parasitic resistances of all converter components are included in calculations. In addition the improved description of CCMDCM boundary is presented. The calculations are verified experimentally and good consistency of the results is observed.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 165-178
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and control of dual stator Winding induction motor
    Autorzy:
    Pieńkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/141285.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model matematyczny
    analiza
    IFOC
    dual stator induction motor
    mathematical models
    analysis
    DFOC and DTC control
    Opis:
    The paper presents the mathematical models of dual stator squirrel-cage induction motor, formulated in phase coordinate system and in general transformed space vector form. The two types of models of dual stator induction motor are considered. The control systems of field-oriented control (IFOC and DFOC) and direct torque control (DTC) of the dual stator induction motor have been described and discussed.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 3; 421-438
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliable robust path planning with application to mobile robots
    Autorzy:
    Pepy, R.
    Kieffer, M.
    Walter, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/930096.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza interwałowa
    planowanie trajektorii
    sterowanie odporne
    interval analysis
    path planning
    robust control
    state-space models
    Opis:
    This paper is devoted to path planning when the safety of the system considered has to be guaranteed in the presence of bounded uncertainty affecting its model. A new path planner addresses this problem by combining Rapidly-exploring Random Trees (RRT) and a set representation of uncertain states. An idealized algorithm is presented first, before a description of one of its possible implementations, where compact sets are wrapped into boxes. The resulting path planner is then used for nonholonomic path planning in robotics.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2009, 19, 3; 413-424
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault diagnosis and fault tolerant control using set-membership approaches: Application to real case studies
    Autorzy:
    Puig, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/908146.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    detekcja uszkodzeń
    sterowanie tolerujące uszkodzenia
    odporność
    fault detection
    fault tolerant control
    robustness
    interval models
    set-membership
    Opis:
    This paper reviews the use of set-membership methods in fault diagnosis (FD) and fault tolerant control (FTC). Setmembership methods use a deterministic unknown-but-bounded description of noise and parametric uncertainty (interval models). These methods aims at checking the consistency between observed and predicted behaviour by using simple sets to approximate the exact set of possible behaviour (in the parameter or the state space). When an inconsistency is detected between the measured and predicted behaviours obtained using a faultless system model, a fault can be indicated. Otherwise, nothing can be stated. The same principle can be used to identify interval models for fault detection and to develop methods for fault tolerance evaluation. Finally, some real applications will be used to illustrate the usefulness and performance of set-membership methods for FD and FTC.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2010, 20, 4; 619-635
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uproszczony model matematyczny pojazdu podwodnego i jego systemu sterowania
    Simplified mathematical model of underwater vehicle and its control system
    Autorzy:
    Szymak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/275503.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    pojazdy podwodne
    modele matematyczne
    symulacja ruchu
    systemy sterowania
    underwater vehicle
    mathematical models
    movement simulation
    control systems
    Opis:
    Wykorzystanie metod neuroewolucyjnych do sterowania pojazdem podwodnym wiąże się z przeprowadzeniem wielu czasochłonnych obliczeń. Do symulowania ruchu pojazdu podwodnego stosuje się najczęściej model nieliniowy. Wykorzystanie tego typu modelu związane jest z skomplikowanymi obliczeniami, co w połączeniu z czasochłonnymi obliczeniami neuroewolucyjnymi może uniemożliwić otrzymanie rozwiązania w rozsądnym czasie. Dlatego też w niniejszej pracy proponuje się zastosowanie modelu uproszczonego automatycznie sterowanego pojazdu podwodnego.
    Using neuro-evolutionary methods to control of an underwater vehicle is connected with time consuming calculations. Usually a nonlinear mathematical model is used to simulate movement of the underwater vehicle. Using the nonlinear model is connected with complicated calculations, which in connection with time consuming neuro-evolutionary calculations can make impossible receiving a solution in reasonable time. Therefore, using the simplified model of the automatically controlled underwater vehicle is proposed in the paper.
    Źródło:
    Pomiary Automatyka Robotyka; 2010, 14, 2; 372-379
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Motor Control: Neural Models and Systems Theory
    Autorzy:
    Doya, K.
    Kimura, H.
    Miyamura, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/908323.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    adaptacyjny układ sterowania
    model wielokrotny
    inverse model
    adaptive control
    cerebellum
    reinforcement learning
    basal ganglia
    multiple models
    Opis:
    In this paper, we introduce several system theoretic problems brought forward by recent studies on neural models of motor control. We focus our attention on three topics: (i) the cerebellum and adaptive control, (ii) reinforcement learning and the basal ganglia, and (iii) modular control with multiple models. We discuss these subjects from both neuroscience and systems theory viewpoints with the aim of promoting interplay between the two research communities.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2001, 11, 1; 77-104
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid of neural networks and hidden Markov models as a modern approach to speech recognition systems
    Hybryda sieci neuronowych i ukrytych modeli Markowa jako nowoczesne podejście do rozpoznawania mowy
    Autorzy:
    Sokólski, P.
    Rutkowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/276753.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    sztuczne sieci neuronowe
    ukryte modele Markowa
    MFCC
    sterowanie
    artificial neural networks
    hidden Markov models
    speech recognition
    control
    Opis:
    The aim of this paper is to present a hybrid algorithm that combines the advantages of artificial neural networks and hidden Markov models in speech recognition for control purposes. The scope of the paper includes review of currently used solutions, description and analysis of implementation of selected artificial neural network (NN) structures and hidden Markov models (HMM). The main part of the paper consists of a description of development and implementation of a hybrid algorithm of speech recognition using NN and HMM and presentation of verification of correctness results.
    Celem artykułu jest przedstawienie algorytmów hybrydowych łączących zalety sztucznych sieci neuronowych i ukrytych modeli Markowa w zastosowaniach rozpoznawania mowy dla potrzeb sterowania. W zakres opracowania wchodzi przegląd stosowanych obecnie rozwiązań, opis i analiza implementacji wybranych struktur sieci neuronowych (NN) oraz ukrytych modeli Markowa (HMM). Główną część artykułu stanowi opis opracowywania hybrydowego algorytmu rozpoznawania mowy wykorzystującego NN i HMM oraz prezentacja wyników weryfikacji poprawności działania.
    Źródło:
    Pomiary Automatyka Robotyka; 2013, 17, 2; 449-455
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The context analysis and the process of its formation
    Autorzy:
    Zavuschak, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/410813.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    context
    knowledge
    type
    processes
    object
    context models
    control contexts
    kontekst
    wiedza
    typ
    proces
    objekt
    modele kontekstowe
    konteksty kontrolne
    Opis:
    The development of the global economy and increased competition requires organizations to find new ways to enhance their competitive advantage. The most important and powerful source of important benefits organizations now have the knowledge and study of the subject – knowledge management processes. The efficiency of knowledge management depends on how these processes are interrelated infrastructure and processes of the organization to support the achievement of its objectives. To understand these relationships and present, not a simple list of elements and processes of the organization. Thus, we can conclude that requires an integrated structure in which all integrated dynamic coherent whole.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2017, 6, 2; 67-72
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compound-combination synchronization of chaos in identical and different orders chaotic systems
    Autorzy:
    Ojo, K. S.
    Njah, A. N.
    Olusola, O. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/229175.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    control and applications of chaos
    low- and high-dimensional chaos
    numerical simulations of chaotic models
    synchronization
    coupled oscillators
    Opis:
    This paper proposes a new synchronization scheme called compound-combination synchronization. The scheme is investigated using six chaotic Josephson junctions evolving from different initial conditions based on the drive-response configuration via the active backstepping technique. The technique is applied to achieve compound-combination synchronization of: (i) six identical third order resistive-capacitive-inductive-shunted Josepshon junctions (RCLSJJs) (with three as drive and three as response systems); (ii) three third order RCLSJJs (as drive systems) and three second order resistive-capacitive-shunted Josepshon junctions (RCSJJs (as response systems). In each case, sufficient conditions for global asymptotic stability for compound-combination synchronization to any desired scaling factors are achieved. Numerical simulations are employed to verify the feasibility and effectiveness of the compound-combination synchronization scheme. The result shows that this scheme could be used to vary the junction signal to any desired level and also give a better insight into synchronization in biological systems wherein different organs of different dynamical structures and orders are involved. The scheme could also provide high security in information transmission due to the complexity of its dynamical formulation.
    Źródło:
    Archives of Control Sciences; 2015, 25, 4; 463-490
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The theorems of Koenig and Birkhoff and their connection with the minimization of the duration time of the measurements of automatic telecommunication channels
    Autorzy:
    Perz, Szczepan
    Zaremba, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/748569.pdf
    Data publikacji:
    1982
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Channel models (including quantum), Discrete-time control systems, Hypergraphs, Matrix equations and identities, Matrices of integers, Stochastic matrices
    Opis:
    .
    A problem (P) of minimization of the duration time of the measurements of automatic telecommunication channels is considered. P is a discrete optimization problem solved by graph theory methods. It is defined by (i)-(v), where: (i) for each i, 1≤i≤p, and j, 1≤1≤p, there are given k ij channels to be measured between node ”i” and node ”j”; (ii) measurement of one channel lasts one unit; (iii) there are exactly two devices, say A, B, in each node (the case where there is an arbitrary number of devices A, B in each node may be easily reduced to this case); (iv) the channel between node ”i” and node ”j” may be measured only by use of device A being present in node ”i” and device B in node ”j”; (v) in each time both devices A or B may measure only one channel. To solve P, some knowledge of hypergraphs as well as functional analysis (the Krein-Milman theorem) and linear algebra (the Koenig theorem) is necessary. The Koenig theorem is proved in a simple manner similarly as the dual Koenig theorem (which is a new result). As corollaries the Birkhoff theorem about bistochastic matrices and the dual Birkhoff theorem are deduced.
    Źródło:
    Mathematica Applicanda; 1982, 10, 19
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relaxed formulation of the design conditions for Takagi-Sugeno fuzzy virtual actuators
    Autorzy:
    Filasova, A.
    Krokavec, D.
    Liscinsky, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/229418.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nonlinear dynamic systems
    Takagi-Sugeno fuzzy models
    fault tolerant control
    static output controllers
    virtual actuators
    linear matrix inequalities
    Opis:
    The H∞ norm approach to virtual actuators design, intended to Takagi-Sugeno fuzzy continuous-time systems, is presented in the paper. Using the second Ljapunov method, the design conditions are formulated in terms of linear matrix inequalities in adapted bounded real lemma structures. Related to the static output controller, and for systems under influence of single actuator faults, the design steps are revealed for a three-tank system plant.
    Źródło:
    Archives of Control Sciences; 2016, 26, 2; 199-221
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Stability of Fuzzy Logic Multi-Regional Output Controllers
    Autorzy:
    Domański, P.
    Brdyś, M. A.
    Tatjewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/908274.pdf
    Data publikacji:
    1999
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sterowanie nieliniowe
    sterowanie wewnętrzne
    zbiór rozmyty
    model Takagi-Sugeno
    nonlinear output control
    fuzzy logic
    Takagi-Sugeno models
    stability conditions
    Opis:
    Design and stability analysis of fuzzy multi-regional digital controllers is considered in the paper. The controllers are based on a notion of NARMAX systems, very similar to the Takagi-Sugeno fuzzy model. The nonlinear system is approximated by a number of linear subsystems. Linear controllers are designed for all subsystems. It can be made in a classical way due to the subsystems linearity. The controllers are blended into one controller by employing fuzzy logic, the result being the fuzzy multi-regional controller (FuMR). The stability analysis of nonlinear systems with FuMR controllers composed of dynamic output feedback local linear controllers is provided. Examples illustrate the design procedure and the meaning of the stability criterion.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 1999, 9, 4; 883-897
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mathematical model for evaluation the efficiency of gas-main pipelines in transient operational modes
    Autorzy:
    Chekurin, V.
    Ponomaryov, Yu.
    Khymko, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/410871.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    gas-main pipeline
    transient modes of operation
    models of gas dynamics
    control by transient process
    efficiency of gas transportation
    duration of transient process
    Opis:
    A mathematical model for control by transient modes of gas flows in the long-distance gas pipeline is considered in the paper. The long-distance pipeline is considered in the model as the system of Line segments serially connected via compressor stations. Gas motion in such system is described by the non-linear system of equations of gas dynamics. In the frame of this model the integral parameters which determine the expenditure of energy and durations of the transient mode are introduced. These parameters can be used for formulation the problems for optimal control steady-state and transient modes of operation of main-gas pipelines.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 3; 25-32
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody obliczeniowe stosowane podczas projektowania obudowy tuneli
    Calculation methods used in the design of tunnel lining
    Autorzy:
    Cała, Marek
    Blajer, Mateusz
    Stopkowicz, Agnieszka
    Tajduś, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/24024801.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
    Tematy:
    teoria silosów Terzaghiego
    metoda kontroli konwergencji
    GRC
    LDP
    SCC
    obudowa tuneli
    modele numeryczne
    Terzaghi’s silo theory
    convergence control method
    tunnel lining
    numerical models
    Opis:
    Artykuł przedstawia ogólną charakterystykę zjawisk zachodzących podczas drążenia tunelu oraz oddziaływań ośrodka skalno-gruntowego na jego obudowę. Charakteryzuje różne metody obliczeniowe stosowane podczas projektowania obudowy tuneli, wskazując ich możliwości i ograniczenia.
    This paper presents a general characteristic of the phenomena occurring during tunnel boring and the impact of the rock-soil mass on its support. It characterizes various calculation methods used in the design of tunnel lining, indicating their possibilities and limitations.
    Źródło:
    Drogownictwo; 2022, 7-8; 213--219
    0012-6357
    Pojawia się w:
    Drogownictwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Medykalizacja społeczeństwa w socjologii amerykańskiej
    The medicalization of society in the American Sociology
    Autorzy:
    Wieczorkowska, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/961556.pdf
    Data publikacji:
    2012
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    medykalizacja życia codziennego kontrola społeczna
    dewiacja
    modele medykalizacji psychofarmakologia
    medykalizacja emocji
    medicalization of everyday life
    social control, deviation
    models of medicalization
    psychopharmacology
    medicalization of emotions
    Opis:
    Zawłaszczanie przez szeroko pojętą medycynę kolejnych obszarów życia ludzkiego – stanów, zachowań i atrybutów – jest procesem globalnym, który na przełomie XX i XXI w. wyraźnie się nasilił. Zjawisko to odznacza się zróżnicowaną dynamiką w ujęciu regionalnym, co jest spowodowane czynnikami natury politycznej, społeczno-ekonomicznej czy religijnej. W Polsce medykalizacja jest wciąż zjawiskiem niezbadanym, a literatura na ten temat powiela obiegowe opinie lub przytacza wyniki badań zachodnich. Ogromna liczba prac amerykańskich autorów poświęconych temu zjawisku może świadczyć o wysokim stopniu zmedykalizowania społeczeństwa. Celem artykułu jest pokazanie zjawiska medykalizacji w kontekście nurtu amerykańskiej socjologii medycyny. Zaprezentowany zostanie dorobek amerykańskich badaczy w perspektywie historycznej, z uwzględnieniem wpływów innych specjalistów zajmujących się tą problematyką. Zjawisko medykalizacji zostanie zaprezentowane jako fenomen interdyscyplinarny, ze szczególnym uwzględnieniem jego społecznych konsekwencji. Następnie podjęta zostanie próba systematyzacji przebiegu procesu medykalizacji w Stanach Zjednoczonych z uwzględnieniem poszczególnych jego etapów. Realizacja tych celów stanie się przyczynkiem do rozważań o procesie medykalizacji w Polsce.
    A process in which medicine enters into everyday life making it medical, by defining and treating states, moods, behaviors and conditions as medical problems (diseases, disorders) is a global phenomenon which expanded between 20th and 21st century. This process has various regional dynamics determined by political, socio-economical and religious factors. In Poland, medicalization, is quite a new phenomenon that needs to be researched. A vast body of American literature in that field suggests high level of medicalization of this society. This essay depicts medicalization in the context of American medical sociology. Several issues is considered: historical perspective, broader theoretical context of that phenomenon, levels of medicalization, its models in a diachronic view, main authors and essential examples of medicalization. This will be the starting point for considerations on the medicalization process in Poland
    Źródło:
    Przegląd Socjologiczny; 2012, 61, 2; 31-56
    0033-2356
    Pojawia się w:
    Przegląd Socjologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated mathematical model of competence-based learning-teaching process
    Autorzy:
    Różewski, P.
    Zaikin, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/202145.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    competence-based learning
    incentive mechanism
    control in social-economic systems
    queuing theory
    competence models
    nauczanie
    mechanizm motywacyjny
    sterowanie w systemach społeczno-gospodarczych
    teoria kolejek
    model kompetencyjny
    Opis:
    The competence-based learning-teaching process is a significant approach to the didactical process organization. In this paper the mathematical model of the competence-based learning-teaching process is proposed. The model integrates three models: a knowledge representation model (based on the ontological approach), a motivation model (as a behavioral-incentive model) and a servicing model (in a form of the queuing model). The proposed integrated model allows to control the learning-teaching process on different levels of management. The learning-teaching process can be interpreted as competence-based due to Open and Distance Learning (ODL) philosophy. We assume that the competence is a result of fundamental, procedural and project knowledge acquisition in accordance to the incoming European Qualification Framework.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 245-259
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a statistically-based methodology for analyzing automatic safety treatments at isolated high-speed signalized intersections
    Autorzy:
    Wojtal, R. M.
    Rilett, L. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/223799.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    traffic control devices
    traffic safety
    traffic signals
    traffic speed
    traffic analysis
    calibration
    validation
    simulation models
    urządzenia kontroli ruchu
    bezpieczeństwo ruchu
    sygnały ruchu
    prędkość ruchu
    analiza ruchu
    kalibracja
    walidacja
    modele symulacyjne
    Opis:
    Crashes at isolated rural intersections, particularly those involving vehicles traveling perpendicularly to each other, are especially dangerous due to the high speeds involved. Consequently, transportation agencies are interested in reducing the occurrence of this crash type. Many engineering treatments exist to improve safety at isolated, high-speed, signalized intersections. Intuitively, it is critical to know which safety treatments are the most effective for a given set of selection criteria at a particular intersection. Without a well-defined decision making methodology, it is difficult to decide which safety countermeasure, or set of countermeasures, is the best option. Additionally, because of the large number of possible intersection configurations, traffic volumes, and vehicle types, it would be impossible to develop a set of guidelines that could be applied to all signalized intersections. Therefore, a methodology was developed in this paper whereby common countermeasures could be modeled and analyzed prior to being implemented in the field. Due to the dynamic and stochastic nature of the problem, the choice was made to employ microsimulation tools, such as VISSIM, to analyze the studied countermeasures. A calibrated and validated microsimulation model of a signalized intersection was used to model two common safety countermeasures. The methodology was demonstrated on a test site located just outside of Lincoln, Nebraska. The model was calibrated to the distribution of observed speeds collected at the test site. It was concluded that the methodology could be used for the preliminary analysis of safety treatments based on select safety and operational measures of effectiveness.
    Źródło:
    Archives of Transport; 2017, 44, 4; 75-88
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mikroprocesorowy system prototypowania do testowania układów sterowania przekształtników
    Microprocessor based prototyping system for inverters control system testing
    Autorzy:
    Sotor, D.
    Michalak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367891.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    szybkie prototypowanie układów sterowania
    technika HIL
    systemy mikroprocesorowe
    modele fizyczne obiektów regulacji
    modelowanie przekształtników
    rapid control prototyping
    hardware in the loop technique
    microprocessor systems
    physical models of controlled systems
    power electronic converters modelling
    Opis:
    Microprocessor based system for testing the controllers of converters is presented in the paper. The system is useful for testing control systems and control algorithms or for parameterization of controller. During the tests of the new controller of converter it is not reasonable use real converter and real controlled object because of possibility of damage. The idea of presented system is using instead the real elements its models based on microcontroller with short computation time that ensures feedback signal for control systems and emulates operation of real converter and controlled object. Presented microprocessor based rapid control prototyping system can emulate operations of two level converter with induction motor or two level active front end converter with the grid. The idea and practical realization of proposed system and emulated controlled object are described in the paper. The features, operation and parameterization of proposed microprocessor based rapid control prototyping system are presented. Proper operation of proposed system is proved by results of experimental tests achieved with laboratory control system operating with scalar and vector control and laboratory active front end controller. The possibility of checking influence of selected disturbances (for example voltage harmonics) is also presented.
    W artykule przedstawiono mikroprocesorowy system służący do prototypowania układów sterowania przekształtników. Jest on przydatny przy testowaniu układów sterowania, algorytmów sterowania oraz doborze parametrów sterowników przekształtników. Idea opisywanego systemu polega na wykorzystaniu do modelowania obiektu regulacji mikrokontrolera o dużej szybkości działania, oprogramowanego w ten sposób aby modelować z wystarczającą dokładnością zachowanie obiektu. System prototypowania powinien dostarczać wymaganych sygnałów sprzężeń zwrotnych dla badanego sterownika. Opracowany mikroprocesorowy system prototypowania modeluje pracę przekształtnika dwupoziomowego z silnikiem indukcyjnym klatkowym lub przekształtnika dwupoziomowego współpracującego z siecią zasilającą. W artykule opisano ideę i realizację systemu prototypowania oraz utworzone modele obiektów regulacji. Omówiono działanie i właściwości wykorzystanego systemu mikroprocesorowego i programu do parametryzacji modeli. Działanie mikroprocesorowego systemu prototypowania zostało potwierdzone wynikami laboratoryjnymi uzyskanymi przy testowania sterownika falownika silnika przy sterowaniu skalarnym i polowo-zorientowanym oraz przy testowaniu algorytmu sterowania przekształtnikiem sieciowym. Przedstawiono również możliwości badania zjawisk zakłóceniowych, np. związanych z występowaniem odkształceń napięcia w modelu sieci zasilającej.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2015, 2, 106; 85-90
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polioptymalizacja rozmyta w MATLABie
    on tools for wood machining
    Autorzy:
    Tarnowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/152712.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    polioptymalizacja
    optymalizacja wielokryterialna
    logika rozmyta
    sterowanie rozmyte
    kryteria lingwistyczne
    model matematyczny
    zbiór Pareto
    zbiór rozwiązań kompromisowych
    poly-optimisation
    Multi Attribute Decision Making (MADM)
    fuzzy logic
    fuzzy control
    linguistic criteria
    mathematical models
    Pareto solutions
    trade-off solutions
    Opis:
    Skutecznym sposobem wdrożenia optymalizacji do praktyki może być wykorzystanie logiki rozmytej do tworzenia modeli matematycznych zadania optymalizacji, jeśli jest dostępna wiedza ekspercka dotycząca obiektu optymalizacji. Dzięki temu: a) unika się żmudnego procesu budowania modelu analitycznego i b) umożliwia się uwzględnienie w modelu rozmytych kryteriów i ograniczeń. W pracy pokazano procedurę wspomagania optymalizacji za pomocą pakietu MATLAB na przykładzie z dwoma i z trzema kryteriami optymalizacji, w ujęciu polioptymalizacyjnym. Wyciągnięto wnioski metodologiczne.
    As for now, optimization techniques are not very popular in real engineering, though they are taught at universities and are recognized as very useful in design and management. Probably the main reason is that mathematical models of objects are difficult to device and, what more criteria may not be precisely defined. A way to enhance an effective implementation of optimisation and MADM techniques to a real practice is a fuzzy logic approach to modelling an optimisation problem, if only the expert knowledge is at hand. It yields: a) avoiding the laborious and often not possible process of building an analytical model, b) makes it possible to use fuzzy and imprecise notions and aspects. In the paper there is proposed a procedure how to device and handle such models in the MATLAB environment to get a Pareto set solutions, in poly-optimisation. The methodology is illustrated on an example of a chemical reactor. The poly-optimal control is to be found. First, having stated criteria, as fuzzy and/or non-fuzzy notions (product quality and effectiveness, in the example), an expert arbitrarily defines decision variables (process temperature, time and mixing velocity), and their membership functions, then a mathematical model is established as a set of rules if - then (Fig. 1). This model may be intuitively verified and corrected by graphical presentations, as in Fig. 2. Then, a poly-optimisation is completed: either by survey of all possible solutions (Fig. 3) and reducing the set to the Pareto solutions (Figs. 4 - 6), or by mathematical optimization algorithms. In the example a first approach is adopted. The example is extended: a third non-fuzzy criterion is introduced (cost). (Figs. 7 - 9).Methodological conclusions are formulated, too.
    Źródło:
    Pomiary Automatyka Kontrola; 2011, R. 57, nr 9, 9; 1059-1062
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-41 z 41

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