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    Wyświetlanie 1-8 z 8
    Tytuł:
    From Problem Conceptualization to Simulation. the Application of the Systems Dynamics to Water Management Problem
    Autorzy:
    Kazimierz, Śliwa
    Powiązania:
    https://bibliotekanauki.pl/articles/474980.pdf
    Data publikacji:
    2011
    Wydawca:
    Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
    Tematy:
    problem simulation
    system dynamics
    water management problem
    Opis:
    The article continues previous text published in "Management Business Innovation" (no. 6, 2010) under the title Stock-And-Flow Thinking In Decision Making. Towards Systemic Procedure of Problem Solving. The methodology presented there is shown in the practical context of water supply management problem in one of the largest cities in Mexico. Basic methodological implications for computer supported problem modeling and simulation are shown, beginning with the Partitioning&Tearing Method, causal diagram of the problem as well as the computer simulation model structure drawn with the VensimTM software.
    Źródło:
    Journal of Entrepreneurship, Management and Innovation; 2011, 7; 51-61
    2299-7075
    2299-7326
    Pojawia się w:
    Journal of Entrepreneurship, Management and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing algorithms for quick rescheduling flow shop problems with FlexSim based simulation and R engine
    Autorzy:
    Janke, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/27313435.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    flow-shop problem
    genetic algorithm
    simulation
    problem przepływowy
    algorytm genetyczny
    symulacja
    Opis:
    Purpose: The aim of this paper is to present a combination of advanced algorithms for finding optimal solutions together with their tests for a permutation flow-shop problem with the possibilities offered by a simulation environment. Four time-constrained algorithms are tested and compared for a specific problem. Design/methodology/approach: Four time-constrained algorithms are tested and compared for a specific problem. The results of the work realisation of the algorithms are transferred to a simulation environment. The entire solution proposed in the work is composed as a parallel environment to the real implementation of the production process. Findings: The genetic algorithm generated the best solution in the same specified short time. By implementing the adopted approach, the correct cooperation of the FlexSim simulation environment with the R language engine was obtained. Research limitations/implications: The genetic algorithm generated the best solution in the same specified short time. By implementing the approach, a correct interaction between the FlexSim simulation environment and the R language engine was achieved. Practical implications: The solution proposed in this paper can be used as an environment to test solutions proposed in production. Simulation methods in the areas of logistics and production have for years attracted the interest of the scientific community and the wider industry. Combining the achievements of science in solving computationally complex problems with increasingly sophisticated algorithms, including artificial intelligence algorithms, with simulation methods that allow a detailed overview of the consequences of changes made seems promising. Originality/value: The original concept of cooperation between the R environment and the FlexSim simulation software for a specific problem was presented.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2023, 168; 163--175
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The principal-agent problem in supply chain management – the simulation based framework
    Autorzy:
    Siuta, Kinga
    Kaszyński, Daniel
    Powiązania:
    https://bibliotekanauki.pl/articles/2183432.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    supply chain
    quantitative models for decision-making
    simulation framework
    agency problem
    principal-agent problem
    ESOP
    Opis:
    This research deals with a phenomenon well-known in socio-economic studies and referred to as the Agency Theory: the principal-agent problem. The agent is designated to act on behalf of the company owner, i.e., the principal, in the domain of supply chain management in the face of a supplier’s default uncertainty. Each of the players is gain-oriented, but their objective functions and the degree of risk-bearing may significantly differ, leading to an agent’s decisions not being optimal in terms of the principal’s outcome. This article proposes a multi-period supply chain simulation model that can be used to perform a supply chain optimization and comparison between the agent and the principal. The proposed framework allows for differentiating the model parametrization depending on the industry, in particular the consequences of the inability to deliver the end product, costs of keeping safety stocks, or the uncertainty regarding the suppliers’ delivery failure. As players’ objective functions, we consider expected profit-based indicators and measures taking the inter-period variance into account. We find that the agent’s actions may diverge from the principal’s optimum if the agent’s incentive system is not selected correctly. We also propose a solution that unifies the goals of the players. The recent COVID-19 pandemic amplifies the importance of such research. Many companies had to limit production capacities due to global lockdowns and, per the JIT production strategy, the prior safety stock levels were low.
    Źródło:
    Control and Cybernetics; 2021, 50, 1; 195--221
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Job Shop Scheduling Problem by Genetic Algorithms: Case Study
    Autorzy:
    Sahar, Habbadi
    Herrou, Brahim
    Sekkat, Souhail
    Powiązania:
    https://bibliotekanauki.pl/articles/24200523.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    optimization
    metaheuristics
    scheduling
    job shop scheduling problem
    genetic algorithms
    simulation
    Opis:
    The Job Shop scheduling problem is widely used in industry and has been the subject of study by several researchers with the aim of optimizing work sequences. This case study provides an overview of genetic algorithms, which have great potential for solving this type of combinatorial problem. The method will be applied manually during this study to understand the procedure and process of executing programs based on genetic algorithms. This problem requires strong decision analysis throughout the process due to the numerous choices and allocations of jobs to machines at specific times, in a specific order, and over a given duration. This operation is carried out at the operational level, and research must find an intelligent method to identify the best and most optimal combination. This article presents genetic algorithms in detail to explain their usage and to understand the compilation method of an intelligent program based on genetic algorithms. By the end of the article, the genetic algorithm method will have proven its performance in the search for the optimal solution to achieve the most optimal job sequence scenario.
    Źródło:
    Management and Production Engineering Review; 2023, 14, 3; 44--56
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of simulation environment for solving the assembly line balancing problem
    Autorzy:
    Danilczuk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/117695.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    line balancing problem
    manufacturing simulation
    Tecnomatix Plant Simulation
    manufacturing
    production system modeling
    symulacja produkcji
    produkcja
    modelowanie systemu produkcyjnego
    Opis:
    The paper describes the application of a simulation environment (Tecnomatix Plant Simulation) for solving a real manufacturing problem. The studied case consisted in rebalancing the production line with a specified number of operators on the line. The first stage of the study involved determination of the production cycle and key performance indicators. The production system was then divided into work cells. After that, proposed design assump-tions were verified via a simulation model.
    Źródło:
    Applied Computer Science; 2018, 14, 1; 42-52
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Simulation of Nonlinear Water Wave Problems
    Autorzy:
    Lo, D. C.
    Hu, Jia-Shen
    Lin, I-Fu
    Powiązania:
    https://bibliotekanauki.pl/articles/116613.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Weather Navigation
    Numerical Simulation
    Oceanography
    Nonlinear Water Wave Problem
    Navier-Stokes Equations
    Solitary Waves
    Free-Surface Flow Problem
    Streamfunction Vorticity Formulation
    Opis:
    The main purpose of present paper aims at the establishment of a numerical model for solving the nonlinear water wave problems. The model is based on the Navier-Stokes equations with the consideration of a free-surface through the streamfunction-vorticity formulation. The main advantage of the streamfunction-vorticity formulation is that pressure field can be eliminated from the Navier-Stokes equations. To demonstrate the model feasibility, the present studies are first concentrated on problems including the collision of two solitary waves with different amplitudes, and the overtaking collision of two solitary waves. Then, the model is also applied to a solitary wave passes over the submerged obstacle in a viscous fluid. Finally, the application of present study is also to simulate the generation of solitary waves by underwater moving object. All examples give very promising results, those applications reveal that present formulation is a very powerful approach to simulate the fully nonlinear water wave problems.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 2; 137-142
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Agent - based dispatching enables autonomous groupage traffic
    Autorzy:
    Gath, M.
    Edelkamp, S.
    Herzog, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/91721.pdf
    Data publikacji:
    2013
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    groupage traffic
    vehicle routing problem
    VRP
    multi-agent system
    decision making
    intelligent agent
    multiagent simulation
    Opis:
    The complexity and dynamics in groupage traffic require flexible, efficient, and adaptive planning and control processes. The general problem of allocating orders to vehicles can be mapped into the Vehicle Routing Problem (VRP). However, in practical applications additional requirements complicate the dispatching processes and require a proactive and reactive system behavior. To enable automated dispatching processes, this article presents a multiagent system where the decision making is shifted to autonomous, interacting, intelligent agents. Beside the communication protocols and the agent architecture, the focus is on the individual decision making of the agents which meets the specific requirements in groupage traffic. To evaluate the approach we apply multiagent-based simulation and model several scenarios of real world infrastructures with orders provided by our industrial partner. Moreover, a case study is conducted which covers the autonomous groupage traffic in the current processes of our industrial parter. The results reveal that agent-based dispatching meets the sophisticated requirements of groupage traffic. Furthermore, the decision making supports the combination of pickup and delivery tours efficiently while satisfying logistic request priorities, time windows, and capacity constraints.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2013, 3, 1; 27-40
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New technique of the local heat flux measurement in combustion chambers of steam boilers
    Autorzy:
    Taler, J.
    Taler, D.
    Sobota, T.
    Dzierwa, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/240253.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kocioł parowy
    odwrotne zagadnienie przewodzenia ciepła
    pomiar strumienia ciepła
    żużlowanie komory paleniskowej
    CFD simulation
    heat flux measurement
    inverse heat conduction problem
    slagging of combustion chambers
    steam boiler
    Opis:
    A new method for measurement of local heat flux to waterwalls of steam boilers was developed. A flux meter tube was made from an eccentric tube of short length to which two longitudinal fins were attached. These two fins prevent the boiler setting from heating by a thermal radiation from the combustion chamber. The fins are not welded to the adjacent water-wall tubes, so that the temperature distribution in the heat flux meter is not influenced by neighbouring water-wall tubes. The thickness of the heat flux tube wall is larger on the fireside to obtain a greater distance between the thermocouples located inside the wall which increases the accuracy of heat flux determination. Based on the temperature measurements at selected points inside the heat flux meter, the heat flux absorbed by the water-wall, heat transfer coefficient on the inner tube surface and temperature of the water-steam mixture was determined.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 103-116
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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