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    Tytuł:
    A method and a model for risk assessment of GNSS utilisation with a proof-of-principle demonstration for polar GNSS maritime applications
    Autorzy:
    Malić, E.
    Sikirica, N.
    Špoljar, D.
    Filjar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201434.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    GNSS
    GNSS Positioning Performance Degradation
    assessment of risk
    lonospheric delay
    intelligent maritime traffic
    maritime applications
    polar region
    polar navigation
    Opis:
    The GNSS positioning performance is commonly defined and described in terms unspecified to particular GNSS-based application. The approach causes difficulties to GNSS application developers, operators, and users, rendering the impact assessment of GNSS performance on the GNSS application Quality of Service (QoS) particularly difficult. Here the Probability of Occurrence (PoO) Model is introduced, which allows for a risk assessment of the probability for the GNSS positioning accuracy failure to meet the requirements of the particular GNSS-based application. The proposed PoO Model development procedure requires a large set of position estimation errors observations, which shall cover a range of classes of positioning environment (space weather, troposphere, multi-path etc.) disturbances affecting GNSS positioning accuracy. As result, the PoO Model becomes a tool that returns the probability of failure in meeting the positioning accuracy requirements of the GNSS applications considered, thus providing the input for a GNSS deployment risk assessment. The proposed PoO Model and its development procedure are demonstrated in the case of polar region positioning environment, with raw GNSS pseudorange observations taken at the International GNSS Service (IGS) Network reference station Iqualuit, Canada are used for the PoO Model development. The PoO Model proof-of-principle is then used to estimate the probability of the unmet required positioning accuracy for a number of polar maritime navigation applications. Manuscript concludes with a discussion of the PoO Model benefits and shortcomings, a summary of contribution, and intentions for the future research.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 43--50
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Working principle and performance evolution of camera-based intelligent signalized intersections: Samsun city, Türkiye example
    Autorzy:
    Aydin, Metin Mutlu
    Potoglou, Dimitris
    Cipcigan, Liana
    Powiązania:
    https://bibliotekanauki.pl/articles/27312355.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    intelligent intersections
    traffic chaos
    control delay
    dynamic signal timing
    urban road
    inteligentne skrzyżowania
    chaos drogowy
    opóźnienie sterowania
    dynamiczny pomiar czasu sygnału
    droga miejska
    Opis:
    In the current literature, it is clearly seen that most of the traffic chaos is generally observed at intersections of the urban roads in cities. On the other hand, many current traffic studies and research prove that fixed-time signalized intersections cannot have a good ability to control and manage current traffic flow at signalized intersection legs. For this aim, intelligent intersections were developed and started to be used in many cities all over the world in the last decade. These new intelligent intersection systems suggest dynamic signal times for all intersection legs by using real-time measured traffic data. These systems generally use cameras or loop detectors, which are located in the proper places on a signalized intersection leg and record vehicle movements. Within the scope of this study, a performance comparison was made for before and after the camera-based intelligent intersection applications at three isolated pilot signalized intersections within the scope of the "Smart City Traffic Safety" project, which is one of the largest Intelligent Transportation System projects in Turkey. After the system was activated, it was observed that the drivers had impatient behaviors in the beginning and had difficulty getting used to these new systems. After the signal cycle was regulated with the learning of artificial intelligence, it was seen that the drivers had more patience and more observant behaviors. It was also obtained from the analysis results that these new intelligent systems resulted in an average 16% decrease in control delays and a 20% decrease in vehicle speeds.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 121; 5--17
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the efficiency of vehicle operation and its environmental friendliness within the controlled crossings
    Autorzy:
    Turpak, Serhii
    Trushevsky, Vjacheslav
    Kuz’kin, Olexiy
    Gritcay, Sergey
    Taran, Igor
    Powiązania:
    https://bibliotekanauki.pl/articles/2098165.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    traffic signalization
    crossing
    traffic delay
    energy efficiency
    sygnalizacja drogowa
    skrzyżowanie
    opóźnienie ruchu
    efektywność energetyczna
    Opis:
    This paper is devoted to improving both the efficiency and the environmental friendliness of road vehicles during their operations through optimization of traffic phase duration within the controlled crossings. A novel criterion to optimize traffic phase duration within a controlled crossing is proposed. The proposed criterion supposes the minimal total delays of all road users waiting for a permissive traffic signal at the crossing and takes into consideration both pedestrian density and the number of passengers in vehicles. The calculation technique for the traffic phase was proposed, according to which delays of all road users were optimized, helping to improve the efficiency of vehicle operation within crossings. Based on the method, a technique to control traffic within crossings is developed and tested. Comparative analysis confirmed the decrease in unproductive delays of vehicles within the controlled crossings by contrast with the traditional approach. The technique makes it possible to reduce the delay of road users by 15-20% depending upon road crowding, the number of pedestrians, and passengers. Owing to the decreased period of waiting for a permissive traffic signal, the energy efficiency of public transport increases.
    Źródło:
    Transport Problems; 2021, 16, 3; 119--130
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reducing Delay Time at Signal Controlled Junction with the Help of Actuated Control
    Autorzy:
    Černický, Ľubomír
    Kupčuljaková, Jana
    Paľo, Jozef
    Kalašová, Alica
    Powiązania:
    https://bibliotekanauki.pl/articles/103235.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    actuated control
    microscopic simulation
    delay time
    Aimsun
    fixed control
    traffic lights
    uruchamiane sterowanie
    symulacja mikroskopowa
    opóźnienie
    stała kontrola
    światła
    Opis:
    Nearly every town faces the traffic problem caused by the continuous increase of the traffic volume. Traffic collapses, congestions, accidents and a further negative impact on the environment are gradually becoming a common part of our lives. Junctions are the most critical points of the road network, which usually determine the capacity of the roads. Therefore, proper traffic organization at junctions is a necessity. This paper analyses the actuated control in comparison to the fixed control at a signal-controlled junction. It also includes a case study of one problematic junction in this paper. With the help of microscopic simulation in Aimsun, 2 solutions for this problematic junction were assessed, one of which is fixed control and other is actuated control. Actuated traffic control gives better results than fixed control.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 3; 149-157
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of bus rapid transit problems in cities with dense construction area
    Autorzy:
    Stotsko, Z.
    Royko, Y.
    Bura, R.
    Hrytsun, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/393565.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    speed of movement
    traffic flow
    traffic volume
    traffic delay
    urban public transport
    prędkość ruchu
    natężenie ruchu
    opóźnienie ruchu
    miejski transport publiczny
    Opis:
    By the methods of field research, it is determined the primary factors of traffic flows on the sections of urban twolane streets, where routes of tram and urban bus movement which have motion in general structure of traffic flow are laid. Using methods of documentary research and traffic simulation, there are received results of change of average operational speed of tram and urban bus movement during different periods of operation on the route; traffic flow delays connected with technological features of tram and urban bus routes functioning in zone of operation of tram and urban bus stops and controlled intersections. Using methods of traffic simulation, it is determined possible time losses and queue length in traffic flows in conditions of increase of traffic volume and change of its composition (increase of urban public transport rate).
    Źródło:
    Archives of Transport System Telematics; 2019, 12, 4; 45-49
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis and proposal of new traffic organisation at the roundabout in the city of Banska Bystrica
    Autorzy:
    Paluch, J.
    Kubikova, S.
    Palo, J.
    Sliacan, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/393860.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    traffic survey
    traffic modelling
    travel time
    delay time
    roundabout
    Opis:
    Building new roundabouts in the city centers become more and more common. Our paper is focused on evaluation of current state of traffic organization at the chosen roundabout based on the transport survey. The chosen roundabout is located on streets Tajovského, Švernova and Nad plážou in the city of Banská Bystrica, near the department store Lidl. Th e roundabout is a connection point between Podlavice neighborhood, Skubín neighborhood, Fončorda neighborhood on south and the city center. For a correct analysis of the traffic situation, a comprehensive assessment of the roundabout and its link to the surrounding traffic junctions is necessary. Once this analysis has been made, it is possible to create a transport model and then make various simulations. We are able to assess in appropriate way a current traffic situation at the roundabout and test a new proposal of roundabout solution, using simulation soft ware.
    Źródło:
    Archives of Transport System Telematics; 2018, 11, 2; 44-47
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie możliwości i ograniczeń zarządzania ruchem sieciowym z wykorzystaniem protokołu MPLS we współczesnych sieciach teleinformatycznych
    A study of opportunities and limitations of traffic management network using MPLS protocol in modern ICT networks
    Autorzy:
    Chaładyniak, D.
    Podsiadły, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/91519.pdf
    Data publikacji:
    2016
    Wydawca:
    Warszawska Wyższa Szkoła Informatyki
    Tematy:
    protokół MPLS
    inżynieria ruchu
    jakość usług
    opóźnienie
    zmienność opóźnienia
    MPLS
    traffic engineering
    quality of services
    delay
    delay variatio
    Opis:
    W artykule przedstawiono technologię MPLS (ang. MultiProtocol Label Switching), która reprezentuje nowy poziom w rozwoju standardów wykorzystywanych w połączeniach technologii przełączania warstwy drugiej modelu odniesienia ISO/OSI z technologią routingu w warstwie trzeciej. Podstawowym celem procesu standaryzacyjnego MPLS jest stworzenie elastycznej struktury sieci, która będzie posiadała dużo większą efektywność niż dotychczasowe systemy sieci oraz będzie w dużo większym stopniu skalowalna. Analizując wyniki otrzymane w badaniach symulacyjnych, można stwierdzić, iż zastosowanie sieci MPLS jest w stanie zagwarantować optymalną jakość usług dla różnego rodzaju aplikacji.
    The article presents MPLS (Multiprotocol Label Switching), which represents a new level in the development of standards used in combinations of switching technology of the second layer ISO/OSI reference model and routing technology in the third layer. The primary objective of the standardization of MPLS is to create a flexible network structure, which will be much more efficient than existing systems and networks, and will be much more scalable. Having analyzed the results obtained in the simulation tests, we can conclude that the use of MPLS network is able to guarantee optimal quality of service for all kinds of applications.
    Źródło:
    Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2016, 10, 15; 19-39
    1896-396X
    2082-8349
    Pojawia się w:
    Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A delay reliability estimation method for Avionics Full Duplex Switched Ethernet based on stochastic network calculus
    Oparta na stochastycznym rachunku sieciowym metoda estymacji niezawodności czasu transmisji dla przełączanej pokładowej sieci ethernetowej typu AFDX umożliwiającej równoczesną transmisję dwukierunkową
    Autorzy:
    Wu, Z.
    Huang, N.
    Li, R.
    Zhang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/301884.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    reliability estimation
    delay upper bound
    stochastic network calculus
    traffic envelope function
    ocena niezawodności
    górna granica opóźnienia
    stochastyczny rachunek sieciowy
    funkcja obwiedni ruchu telekomunikacyjnego
    Opis:
    The delay reliability estimation is required in order to guarantee the real-time communication for avionics full duplex switched Ethernet (AFDX). Stochastic network calculus (SNC) can be applied to estimate the reliability with a delay upper bound. However, only linear deterministic traffic envelope function is used to bound its traffic, which cannot represent the traffic randomness and is far from practice. In this paper, a stochastic traffic envelope function, which randomizes the input of SNC, is proposed to solve the problem. A new probabilistic algorithm is derived to estimate the delay reliability based on stochastic envelope functions. A test was conducted to demonstrate our method on an AFDX testbed, and the test results verify that the estimation of delay reliability via our algorithm is much closer to the empirical estimation.
    Ocena niezawodności czasu transmisji (czasu opóźnienia) jest niezbędną procedurą gwarantującą komunikację w czasie rzeczywistym za pośrednictwem przełączanej pokładowej sieci ethernetowej typu AFDX (Avionics Full Duplex Switched Ethernet), która umożliwia równoczesną transmisję dwukierunkową. Stochastyczny rachunek sieciowy (SNC) można stosować do oceny niezawodności przy zadanej górnej granicy opóźnienia. Do tej pory jednak, do ograniczania ruchu telekomunikacyjnego stosowano tylko liniową deterministyczną funkcję obwiedni (traffic envelope), która nie oddaje losowości ruchu telekomunikacyjnego i odbiega dalece od rzeczywistości. W niniejszej pracy zaproponowano rozwiązanie tego problemu wykorzystujące stochastyczną funkcję obwiedni ruchu telekomunikacyjnego. Wyprowadzono nowy algorytm probabilistyczny, który pozwala ocenić niezawodność czasu transmisji na podstawie funkcji obwiedni. Przeprowadzono badanie, w ramach którego testowano zaproponowaną metodę w środowisku testowym AFDX; wyniki testu pokazują, że ocena niezawodności czasu transmisji z wykorzystaniem zaproponowanego przez nas algorytmu jest znacznie bardziej zbliżona do estymacji empirycznej.
    Źródło:
    Eksploatacja i Niezawodność; 2015, 17, 2; 288-296
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Dynamic Characteristics of Vehicles on the Passenger Car Equivalent and Traffic Delay
    Autorzy:
    Fornalchyk, Ye.
    Mohyla, I.
    Hilevych, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411007.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    passenger car equivalent (PCE)
    traffic delay
    traffic light cycle
    saturation flow
    vehicle
    technical condition
    speed up
    Opis:
    The analysis of transportation flow andtechnical condition of cargo-carrying vehicles and buses has showed the need in the research of its influence on the passing density on signalized intersections. The indicator which reflects this influence is represented by light motor vehicle passenger car equivalent (PCE). The need in determining a passenger car equivalent for differently structured transportation flows is demonstrated not according to the recognized methodology, but according to the one developed by the authors which takes into account both diverse structure and the level of technical condition of road users. The latter one decreases launching dynamics of vehicles which depart from the stop line. The respective passenger car equivalents are determined for such a structure of traffic flow. These calculations differ from already known and normative ones. Due to the simulation (the VISSIM program) of passing at an intersection with the use of calculated passenger car equivalents which take into account the technical condition of vehicles, traffic delays on the main direction were defined as decreased by 7.6% for respective duration of permissive signal on a traffic light.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 2; 45-50
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of cross-section on roads through built-up areas
    Autorzy:
    Kieć, M.
    Tracz, M.
    Gaca, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/230190.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model symulacji
    zmiana
    sieć dróg
    bezpieczeństwo drogowe
    przekrój
    wydajność ruchu
    pomiary skuteczności
    opóźnienia
    prędkości jazdy
    pluton
    simulation model
    modification
    road network
    road safety
    cross-section
    traffic performance
    measurements of effectiveness
    delay
    travel speed
    platoon
    Opis:
    The research into the use of less costly modifications of road links and networks, and changes in the service of road surroundings aimed at ensuring an improvement of through traffic performance in suburban areas, and on roads passing through built-up areas as small localities, with application of simulation model, is presented in this paper. From among possible designs, the authors investigated and presented the effectiveness of two, i.e. implementation of an additional multifunctional median lane in the road cross-section, and construction of service roads with different locations of intersections (end or middle of the road section). The analysis is focused on the impact of such changes on traffic performance and road safety. The authors analysed travel speed, delay and share of platoon traffic on a uniform sections of the road for different types of road surroundings service. The study presents the results of analyses of road network before and after modification, and the assessment of: impact of access points density and level of their use on road traffic performance, impact of driving through road sections in built-up area on building platoon traffic, impact of change in the cross-section type on traffic performance.
    Źródło:
    Archives of Civil Engineering; 2012, 58, 3; 243-257
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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