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    Wyświetlanie 1-6 z 6
    Tytuł:
    The Concept of Calculating the Water Distribution System as a Repeatable Process with Elements of Diagnostics Using Neural Modeling
    Autorzy:
    Dawidowicz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2174897.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    water distribution system
    hydraulic calculation
    process diagnostics
    evaluation of calculation results
    artificial neural network
    Opis:
    Calculations of water distribution systems are most often performed many times because the correct solution from a technical point of view is rarely obtained after the first calculation run; hence, we can talk about a multistage calculation process. In connection with this, the calculation process of computer water distribution systems can be additionally supplemented with elements of process diagnostics. Diagnostic activities should be carried out using numerical algorithms, which can be a complement to classical hydraulic calculations of water distribution systems. The condition for reliable functioning of the diagnostic system formulated in this way is the efficient detection of computational irregularities. For this purpose, diagnostic problems were defined for the water pipes and the connection nodes in the water distribution system. The proposed diagnostic tests analyze the calculation results and indicate whether the solution is correct or, if irregularities are detected, suggest a way to solve the problem. Diagnostic tests are carried out using artificial neural networks.
    Źródło:
    Rocznik Ochrona Środowiska; 2022, 24; 493--504
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of MLP and RBF Neural Networks in the Task of Classifying the Diameters of Water Pipes
    Autorzy:
    Gvishiani, Zurab
    Dawidowicz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2174907.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    water distribution system
    hydraulic calculation
    selection of diameter
    water pipe
    artificial neural network
    radial basis function
    multilayer perceptron
    Opis:
    Hydraulic calculations of water distribution systems are currently performed using computer programs. In addition to the basic calculation procedure, modules responsible for evaluating the obtained calculation results are introduced more and more often into the programs. This article presents the results of research on artificial neural networks with a radial base function (RBF) and a multilayer perceptron (MLP), aimed at determining whether they can be used to model the relationship between the variables describing the computational section of the water distribution system and the diameter of the water pipe. The classification capabilities of the RBF and MLP networks were analyzed according to the number of neurons in the hidden layer of the network. A comparative analysis of RBF networks with multilayer perceptron (MLP) networks was performed. The results showed that the MLP networks have much better classification properties and are better suited for the task of assessing the selected diameters of the water pipes.
    Źródło:
    Rocznik Ochrona Środowiska; 2022, 24; 505--519
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Modeling of Water Supply and Sewerage Networks as a Tool in an Integrated Water and Wastewater Management System in Municipal Enterprises
    Autorzy:
    Kruszyński, Wojciech
    Dawidowicz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/124822.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    computer modeling
    water supply
    sewerage network
    GIS
    Opis:
    The purpose of the study was to present the principles of creating and implementing an integrated water and wastewater management system based on hydrodynamic modeling of water distribution and sewage disposal systems in small and medium-sized municipal enterprises. The computer modeling of water and sewerage networks is an efficient tool for finding the causes of increased costs of operation of these plants. The simulations carried out in modeling programs enable to quickly find the optimal variant to solve the problem of exploitation or economically effective direction of their modernization. Geospatial data (GIS) is being increasingly often being used to optimally manage the municipial water and sewage infrastructure. This gives an additional analytical tool for planning, designing, obtaining operational data, etc. The integration of hydraulic models of the water supply and living and economic networks into one coherent management system is possible, owing to which, a holistic assessment of the functioning of the water and sewage management system in the city is possible. The decision support systems based on the spatial information system (GIS) associated with various specialized software, are becoming the standard of modern management of a water and sewage company. To date, only about 40% of enterprises in this industry in Poland have used systems of this type. In addition, most of the GIS-based management systems used in practice are limited to an inventory of existing network resources and integration of many databases in one coherent IT system. Only in a few cases, the systems of this type contain modules modeling the network operation under dynamic conditions, which results primarily from the additional implementation costs related to the construction of sufficiently reliable models of the water supply and / or sewerage network. Implementation of the proposed solution includes: construction of a water supply network simulation system, construction of a domestic and economic sewage system simulation system, devising scenarios for system operation under the conditions of city development and climate change, multi-criteria assessment of the economic effectiveness of systems operation taking into account social and environmental criteria, development of an integrated management system the system, taking into account the guidelines for increasing the effectiveness of its operation and work safety.
    Źródło:
    Journal of Ecological Engineering; 2020, 21, 2; 261-266
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kohonen Artificial Networks for the Verification of the Diameters of Water-pipes
    Autorzy:
    Dawidowicz, Jacek
    Czapczuk, Andrzej
    Kruszyński, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2069889.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    water distribution system
    hydraulic calculations
    diameter selection
    Kohonen Network
    evaluation of calculation results
    Opis:
    The design of the water distribution system is inherently linked to the execution of calculations, which aim, among other things, to determine the flow rate through individual pipes and the selection of diameters at the appropriate speed. Each step in the calculations is followed by an evaluation of the results and, if necessary, a correction of the data and further calculations. It is up to the designer to analyse the accuracy of the calculation results and is time-consuming for large systems. In this article, a diagnostic method for the results of hydraulic calculations, based on Kohonen Network, which classifies nominal diameters [DN] on the basis of data, in the form of flows, has been proposed. After calculating the new variant of the water distribution system, the individual calculation sections are assigned to the neurons of the topological map of Kohonen Network drawn up for nominal diameters. By comparing the diameter used for the calculation, with the diameter obtained on the topological map, the accuracy of the chosen diameter can be assessed. The topological map, created as a result of labelling the neurons of the output layer of the Kohonen Network, graphically shows the position of the classified diameter, relative to those diameters with similar input values. The position of a given diameter, relative to other diameters, may suggest the need to change the diameter of the pipe.
    Źródło:
    Rocznik Ochrona Środowiska; 2021, 23; 835--844
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hominization tendencies in the evolution of primates in multidimensional modeling
    Autorzy:
    Sikorska-Piwowska, Zofia
    Zalewska, Marta
    Tomczyk, Jacek
    Dawidowicz, Antoni Leon
    Mańkowska-Pliszka, Hanna
    Powiązania:
    https://bibliotekanauki.pl/articles/748368.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    hominization tendencies in the primates evolution, human roots, primate evolution model
    Tendencje hominizacyjne w ewolucji naczelnych, ludzkie korzenie, ewolucyjny model naczelnych
    Opis:
    Radiacja ewolucyjna naczelnych wyznaczyła wiele dróg rozwojowycha wsród nich tendencje hominizacyjna prowadzaca do powstaniaczłowieka współczesnego. Ta ewolucja została zbadana na podstawie pomiarówtworzacych wskaznik Moranta i Sergiego (Sergi(1940)), pobranych na 68 czaszkachwybranych małp i kopalnych hominidów w wieku adultus. Zostały onezakwalifikwane do dziesieciu odrebnych taksonów. Pomiary czaszek zostałyopracowane przy uzyciu statystyki opisowej i analizy dyskryminacyjnej, jakometody pozwalajacej na wychwycenie róznic miedzy badanymi taksonami cozostało przedstawione na podstawie odległosci Mahalanobisa. Ponadto zastosowanoanalize wariancji ANOVA wraz z porównaniami wielokrotnymiTukeya oraz rangowy współczynnik korelacji Kendalla $\tau$ oparty na róznicyprawdopodobienstwa wzrostu lub zmniejszania sie jednej zmiennej pomiarowejwzgledem drugiej.W wyniku przeprowadzonych analiz stwierdzono, zeewolucja małp człekokształtnych przebiegała od form prymitywnych, którychcechy czaszki nawiazywały do zbadanych przez nas form taksonów szympansai orangutana, a forma najbardziej odbiegajaca od rdzenia ich ewolucjijest gibon. Ewolucja pawianów bedzie odpowiednikiem rozwoju filogenetycznegoform posrednich prowadzacych do formy orangutana. Tak wiec cechyczaszki orangutana maja charakter preadaptywny, stanowiacy punkt wyjsciazarówno dla małp człekokształtnych jak i zwierzokształtnych. Hominidypoprzez formy australopiteków masywnych i gracylnych doprowadziły równolegledo powstania pitekantropa, którego dalszy rozwój zaowocował w formieneandertalskiej. Człowiek współczesny pozostał odległy od wszystkich naczelnychpoprzez równoczesny wzrost wysklepienia i wysokosci mózgoczaszki, copozwoliło na ogromny rozwój mózgu. Ten typ rozwoju jest wyrazem skokujakosciowego w ewolucji naczelnych.
    Evolutionary radiation of primates determined many developmental paths among which there is a hominization tendency that leads to the emergence of modern human. This evolution was studied on the basis of measurements constituting Morant and Sergi's index (Sergi(1940)), which were taken on 68 skulls of chosen adult monkeys, apes and fossil hominids. They were classified into 10 separate taxons. The skull measurements were worked out with the help of the following methods: descriptive statistics and discriminant analysis, a method that allow spotting differences between the taxons studied on the basis of Mahalanobis distance. Moreover, analysis of variance, ANOVA, was applied as well as Tukey's multiple comparisons and Kendall's $\tau$  rank correlation coefficient based on the difference in the probability of growth or decrease of one measuring variable in relation to the other one.  As a result, the analysis performed showed that apes take their origin from the primitive forms in relation to chimpanzee (PAN taxon) and orangutan  (PONGO taxon). Evolution of baboon (PAPIO taxon) is in developmental  lineage of intermediate ancestors of orangutan (PONGO  taxon). Gibbons are forms which differ  from their evolution roots the most.  Hominids, through massive and gracile \textit{Australopithecus} forms, led simultaneously to the emergence of \textit{Pithecanthropus} whose further evolution resulted in the neanderthal form. Modern humans remained distinct from all primates due to simultaneous growth of cranial vault and height, which allowed for considerable brain development.  This type of development can be regarded as a manifestation of a qualitative jump in the evolution of primates.
    Źródło:
    Mathematica Applicanda; 2015, 43, 1
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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