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    Wyświetlanie 1-9 z 9
    Tytuł:
    Metody modelowania emisji zanieczyszczeń z pojazdów samochodowych
    Modern methods of modeling of emissions from motor vehicles
    Autorzy:
    Jaworski, A.
    Lejda, K.
    Mądziel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/313618.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    emisja spalin
    przepływ ruchu drogowego
    Vissim
    exhaust emission
    traffic flow
    Opis:
    W artykule omówione zostały dwa wybrane programy służące do modelowania zanieczyszczeń emitowanych przez pojazdy samochodowe, tj. Enviver oraz COPERT 5. Część badawcza dotyczy analizy wybranego ronda działającego w Rzeszowie względem generowanych emisji toksycznych składników spalin samochodowych. Obliczenia ilości emisji spalin dokonane zostały na podstawie danych z programu do mikrosymulacji ruchu Vissim.
    In the article discussed two selected programs for modeling of pollutants emitted by motor vehicles, such as Enviver and COPERT 5. The practical part concerns the analysis of the selected roundabout working in Rzeszow in terms of generated toxic exhaust emissions. The calculations of emissions were made on the basis of data from the microsimulation program Vissim.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 6; 760-764, CD
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Its-pro-flow: a new enhanced short-term traffic flow prediction for intelligent transportation systems
    Autorzy:
    Kozici, Halil Ibrahim
    Kosunalp, Selahattin
    Arucu, Muhammet
    Powiązania:
    https://bibliotekanauki.pl/articles/27314659.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    traffic flow
    intelligent transportation
    prediction
    Pro-Energy
    przepływ ruchu
    inteligentny transport
    przewidywanie
    Opis:
    Short-term traffic flow prediction plays a significant role in various applications of intelligent transportation systems (ITS), such as road traffic control and route guidance. This requires the development of intelligent prediction approaches for accurate and timely traffic flow information. To handle this issue, this paper emphasizes the potential of a new idea to propose a high-quality and intelligent prediction of short-term traffic flow in ITS. The proposed model, referred to as ITS-Pro-Flow, takes the benefits of the well-known Profile-Energy (Pro-Energy) as a landmark solution, relying on past observations and current conditions to forecast future short-term traffic flow volume. ITS-Pro-Flow has an effective prediction mechanism due to its unique enhancements over Pro-Energy. The distinctive feature of ITS-Pro-Flow is that it dynamically adjusts the contributions of past predictions and current observations for a particular prediction, which is equally performed in Pro-Energy. We prove the performance of ITS-Pro-Flow through extensive simulations with 2 datasets, in comparison to Pro-Energy and IPro-Energy. Performance results clearly indicate that ITS-Pro-Flow provides more accurate predictions than other schemes.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 120; 117--136
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Saturated arterial coordinate control strategy optimization considering macroscopic fundamental diagram
    Autorzy:
    Lin, Xuanhua
    Lin, Xiaohui
    Chen, Kelian
    Powiązania:
    https://bibliotekanauki.pl/articles/2173927.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    traffic state
    MFD
    macroscopic fundamental diagram
    urban road network
    traffic flow
    stan ruchu
    diagram
    miejska sieć drogowa
    przepływ ruchu
    Opis:
    MFD is widely used in traffic state evaluation because of its description of the macro level of urban road network. Aiming at the control strategy optimization problem of urban arterial road network under saturated traffic flow state, this study analyzes the MFD characteristics of a typical three-segment "ascending-stable-descending segment" and its advantages in characterizing the macroscopic operation efficiency of the road network, a arterial coordination control strategy considering MFD is proposed. According to the characteristics of MFD, it is proposed that the slope of the ascending segment and the capacity of the road network represent the operating efficiency of the free flow and saturated flow of the road network respectively. The traffic flow and density data of road segment are obtained by the road detector through Vissim simulation software. Aiming at the problem that the MFD is too discrete due to unreasonable control strategy or traffic condition, and in order to extract the MFD optimization target indicators, it is proposed to extract the key boundary points of the MFD by the “tic-tac-toe” method and divide the MFD state by Gaussian mixture clustering. The genetic algorithm integrates the multi-objective particle swarm algorithm as the solution algorithm, and the simulation iterative process is completed through Python programming and the com interface of Vissim software. In order to verify the validity of the model and algorithm, the actual three-intersections arterial road network is used for verification, and the model in this study is compared with the optimization model without considering MFD, the model solved by traditional algebraic method, and the optimization model solved by typical multi-objective particle swarm. Results show that the model in this research performs well in efficiency indicators such as total delay, average delay, and queue coefficient. At the same time, the MFD form has highest stability, the control effect is the best in the saturated state. The solution algorithm GA-MOPSO also has a better solution effect.
    Źródło:
    Archives of Transport; 2022, 62, 2; 73--90
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis of LSTM model with multi-step ahead strategies for a short-term traffic flow prediction
    Autorzy:
    Doğan, Erdem
    Powiązania:
    https://bibliotekanauki.pl/articles/2134868.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    traffic flow
    LSTM
    short-term prediction
    multi-step ahead strategies
    przepływ ruchu
    prognozowanie krótkoterminowe
    strategie wieloetapowego wyprzedzania
    Opis:
    In this study, the effect of direct and recursive multi-step forecasting strategies on the short-term traffic flow forecast performance of the Long Short-Term Memory (LSTM) model is investigated. To increase the reliability of the results, analyses are carried out with various traffic flow data sets. In addition, databases are clustered using the k-means++ algorithm to reduce the number of experiments. Analyses are performed for different time periods. Thus, the contribution of strategies to LSTM was examined in detail. The results of the recursive based strategy performances are not satisfactory. However, different versions of the direct strategy performed better at different time periods. This research makes an important contribution to clarifying the compatibility of LSTM and forecasting strategies. Thus, more efficient traffic flow prediction models will be developed and systems such as Intelligent Transportation System (ITS) will work more efficiently. A practical implication for researchers that forecasting strategies should be selected based on time periods.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 111; 15--31
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of information bases for the application of operational aviation regulations
    Autorzy:
    Šála, J.
    Němec, V.
    Novák, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/393529.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    3D modelling
    traffic flow
    electronic regulation
    information basis
    modelowanie 3D
    przepływ ruchu
    regulacja elektroniczna
    baza informacyjna
    Opis:
    Text of the article describes the application of information bases as a tool for safety in air transport. By converting these rules into the base allows easier and quicker orientation in regulatory requirements. The following paragraphs provide information about the whole concept and demonstrate key concepts needed to understand the software.
    Źródło:
    Archives of Transport System Telematics; 2013, 6, 4; 42-45
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inland water transport applicability for sustainable sea port hinterland infrastructure development. Klaipeda Sea-Port case
    Autorzy:
    Malkus, Ričardas
    Liebuvienė, Jūratė
    Jokubyniėnė, Vida
    Powiązania:
    https://bibliotekanauki.pl/articles/1841182.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    Kleipeda Sea-Port
    transport infrastructure
    maritime terminals
    traffic flow
    port morski w Kłajpedzie
    infrastruktura transportu
    terminale morskie
    przepływ ruchu
    Opis:
    The aim of this paper is to present an analysis of the main factors influencing negatively Klaipeda Sea Port performance and competitiveness as well as their limiting impact on the development of this transport system entity in general. This case study research is proposing some alternative solutions decreasing negative influences of comparatively declining land transport infrastructure connectivity to the Sea Port hinterland. Analysis of hinterland connectivity is based on the extended gate concept, where a series of terminals and related logistical activities are integrated into a functional single entity. The intensity of real road transport flows on the main connecting road intersections has been evaluated using digital tools with input data from the ArcGIS platform. Also, accessibility to other terminals (at the local, regional and global scale) as well as the terminal is linkage to the regional transport system has been taken into account. One of the objectives of this research was to define objectively the state of traffic flow on the highway connecting Klaipeda sea-port to its hinterland because the road infrastructure was not qualitatively improved for a long period, while the average annual seaport turnover is constantly growing by 6% - 9%. Secondly, it was defined how substantially is possible to decrease the load of road traffic in case of reestablishing of an inland waterway connection between practically the same points of the transport route. Using mathematical modeling of traffic flows is proved that, road transport highway connection in/from the Klaipeda Seaport is loaded substantially and requires systemic improvement (building at least additional lanes in both directions, etc.) to promote further growth of Klaipeda sea-port capacities. The option to apply an additional inland waterway connection allows to decrease the road traffic flow up to 9 – 11% with the possible development of this option, what in its’ turn also decrease the negative influence on the environment.
    Źródło:
    Transport Problems; 2020, 15, 2; 25-31
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On site processing of video stream for mapping traffic parameters
    Autorzy:
    Pamuła, Wiesław
    Kłos, Marcin Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2203089.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    video surveillance
    discrete wavelet transforms
    traffic flow
    traffic density
    intelligent transportation systems
    nadzór wideo
    dyskretna transformacja falkowa
    przepływ ruchu
    gęstość ruchu
    inteligentne systemy transportowe
    Opis:
    Traffic surveillance provides crucial data for the operation of intelligent transportation systems. The growing number of cameras in the transport system poses a problem for the efficient processing of surveillance data. Processing of video data for extracting traffic parameters is usually done using image processing methods and requires substantial processing resources. An alternative way is to transform the video stream and map the traffic parameters using the obtained transform coefficients. Spatiotemporal wavelet transform of the video stream contents, using filter banks, is proposed for mapping traffic parameters. Performed tests prove good resilience to illumination changes of road scenes. Mapping errors are smaller than in the case of the commonly used video detectors at sites on multilane roads with low to moderate traffic load.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2022, 117; 175--189
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Znaczenie i źródło kongestii transportowej na przykładzie białostockiej aglomeracji miejskiej
    Importance and Source of Transport Congestion on the Example of the Urban Area of Białystok
    Autorzy:
    Wappa, P.
    Halicka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/399046.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    logistyka
    zatłoczenie transportu
    aglomeracja miejska
    transport publiczny
    miejska infrastruktura
    przepływ ruchu
    logistics
    transport congestion
    urban area
    public transport
    urban infrastructure
    traffic flow
    Opis:
    The development of industrialization in the 20th century that resulted in the conversion of agricultural land in the industrial societies and migration of rural population to urban areas, started the process of urbanization in the world. The changes resulted in infrastructure transformations and determined the shape and functioning of the centers of modern life. Present continually increasing urban growth, complicates the free movement of goods and cargo flows in cities. It affects their dysfunctional nature, generating phenomenon in the form of transport congestion. The aim of research is the approximation of this problem. The study will be done on the example of the transportation system condition in the urban area of Białystok.
    Źródło:
    Ekonomia i Zarządzanie; 2011, 3, 4; 63-75
    2080-9646
    Pojawia się w:
    Ekonomia i Zarządzanie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność natężenia ruchu rumowiska wleczonego w czasie wezbrania w małej rzece nizinnej
    Variability of bedload transport rate during flood flow event in small lowland river
    Autorzy:
    Popek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/887162.pdf
    Data publikacji:
    2008
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    natezenie ruchu rumowiska wleczonego
    przeplyw wody
    rumowiska wleczone
    rzeka Zagozdzonka
    rzeki nizinne
    transport rumowiska
    wezbrania wod
    Opis:
    In the paper are shown analysis’ results of bedload transport variability during fl ood fl ow event observed in the Zagożdżonka River. The bedload measurement station, which is provided with bedload trap and instruments for continuous measuring and data recording, is located upstream of Czarna gauge station on research catchment area of Dept. of Hydraulic Engineering and Environmental Recultivation WULS. Based on measurements’ results of the fl ow and bedload transport parameters the correlation formulas (12) and (13) were determined, respectively for rising limb and recession of discharge hydrograph. For determination’s purpose of formulas (12) and (13) the Bagnold’s relationship (3) were used, modifi ed by author to the form (5), in which specifi c bedload discharge depends on specifi c stream power, hydraulic radius for river-channel bottom and median size of bed material.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2008, 17, 2[40]
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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