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    Wyświetlanie 1-14 z 14
    Tytuł:
    Container terminal as a queening transport networks
    Autorzy:
    Smolarek, L.
    Wilczyński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/241560.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    container terminal
    queuing theory
    queuing networks
    Opis:
    The queuing networks consist of several connected simple queuing system. In container terminal as an open network containers enter the queuing network from sea and landside, received adequately service at system and leave the network. Jackson’s network is simplest form of queuing networks, characterized by unlimited overall numbers of customers belong to the one class of customers. Customer – containers arrived' system with exponential arrival pattern (Poison or Erlang) and are served on single or multi-channel servers with exponential service time.Another case of queuing networks is network of Kelly with different classes of customers (containers) but each class of containers has fixed route (service model) in the transport system. The Baskett, Chandy, Muntz and Palacios – BCMP networks include different class of customers, with different queuing discipline and generally distributed time. Routes (service model) through the network may depend on the class of customers – containers, and the containers can change its class while passing through the system. This article describes different queuing networks, which can be used to modelling of the container terminal as a queuing transport network. The Queuing Theory may be used to determine the appropriate level of capacity required at container terminal and the staffing levels required at service facilities, over the nominal average capacity required to service expected demand. The model of the container terminal called a queuing network had better represent the real structure then a single system.
    Źródło:
    Journal of KONES; 2014, 21, 3; 265-270
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Urban flows simulator based on complex system of queues: procedures for simulator generation
    Autorzy:
    Pasini, L.
    Sabbatini, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1938604.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska
    Tematy:
    traffic systems
    queuing networks
    modeling
    simulation
    Opis:
    In a previous work [1], we have defined an object library that allows the building of architectural models of urban traffic systems. In this work we illustrate the procedures that enable us to produce a system simulator starting from the architectural model of an urban vehicular traffic system.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 1; 9-31
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of a vehicular traffic system based on queuing network models
    Autorzy:
    Pasini, Leonardo
    Bianchini, Lorenzo
    Powiązania:
    https://bibliotekanauki.pl/articles/1954450.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska
    Tematy:
    vehicular traffic systems
    queuing networks
    modeling
    simulation
    Opis:
    This work is part of the research activities developed in our department on the construction of vehicle traffic system simulators (TASKQuart.22(2) 135 [1],20(1) 9 [2],17(3) 155 [3],20(3) 273 [5],14(4) 405 [6],9(4) 397 [7],Simulation Modelling Practice and Theory 17 (4) 625 [8]). The modeling of the traffic system is implemented through the use of queuing networks. In this case we analyze, through a simulation, the impact on traffic flows of a structural change that the Municipal Administration has implemented on the urban road system. The study refers to some works published by us previously about the procedures applied by us to build a simulator. In this case we have developed software allowing us to analyze the data tracked by the system simulations to display it graphically. This procedure enables us to clearly compare the traffic system behavior in its new configuration with the traffic system behavior in the previous configuration.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2019, 23, 1; 101-135
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the impact of changes in the city road system on traffic flows
    Autorzy:
    Pasini, Leonardo
    Powiązania:
    https://bibliotekanauki.pl/articles/1955280.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska
    Tematy:
    vehicular traffic systems
    queuing networks
    modeling
    simulation
    Opis:
    This paper outlines a study carried out to answer the questions asked by an architect of the Siena Municipality Office during a conference at our Department on the managementof traffic flows through the Siena North city road system. The purpose of the study was to ascertain if changes in the road system introduced and included in the new City Developmen tPlan would resolve the current traffic congestion issues. In order to answer this question, we used the technology for the development of vehicle traffic system simulators which was introduced during our previous projects (TASKQuart.14(4) 405,17(3) 155,20(1) 9,20(3) 273).
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2018, 22, 2; 135-171
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Queuing networks to evaluate web applications: simulation
    Autorzy:
    Pasini, Leonardo
    Barboni, Morena
    Powiązania:
    https://bibliotekanauki.pl/articles/1955220.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska
    Tematy:
    traffic simulators
    queuing networks
    web application
    distributed simulation
    Opis:
    This work fits into the context of our studies on traffic simulation for computer and telecommunication networks [1–5]. The technique that we use is based on complex queuing network models that allow us to simulate the functioning of network devices, and the traffic flows between them. In a previous work [2] we defined a library of objects for the modeling of the computer network. This library also models the network traffic induced by the execution of web applications run in a distributed fashion on various network devices. In this work we describe the changes applied to the service procedures of some library objects, and we develop a specific study for the evaluation of the execution times of three types of applications: 1. Navigation 2. Download Manager 3. Mobile Agents.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2019, 23, 3; 319-355
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulators of VOIP traffic in P2P networks
    Autorzy:
    Pasini, L.
    Feliziani, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943203.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska
    Tematy:
    traffic simulators
    queuing networks
    P2P networks
    VOIP traffic
    Opis:
    This study is included in a research programme developed by the authors at the University of Studies in Camerino for the construction of traffic flow simulators in computer and telecommunication networks [1–4]. The article contains the definition of a library of object types whose architecture is based on the queue networks, for a simulation of the VOIP traffic in P2P networks. Basing on this library, we simulate the traffic in a P2P network that is locally implemented with three different technology types: 1. Fast Ethernet, 2. Wireless, 3. ADSL2+. In this context, we simulate traffic flows due to file-sharing applications in the network and due to voice communications through the VOIP technology. Thus, we evaluate the impact of the VOIP traffic for procedures of file-sharing in a P2P network.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2009, 13, 4; 315-345
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vehicular traffic simulations: use of a games engine for video rendering and verification of an architecture model based on queuing systems
    Autorzy:
    Pasini, L.
    Rietti, F. M.
    Allegretto, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1938605.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska
    Tematy:
    traffic systems
    queuing networks
    modelling and simulation
    graphic simulation
    Opis:
    In a previous work [Pasini L and Sabatini S 2016 TASK Quart. 20 (1) 9], we described a technique that allows a specific system of urban traffic to be associated to a description file system, called Model.dat. This file contains a list of data objects that are defined in the library [Pasini L and Feliziani S 2013 TASK Quart. 17 (3) 155] and that form the architecture model of a vehicular traffic system. This model turns out to be a network of queuing systems. In this work, we illustrate how we adapted the old procedure to study a new urban traffic system. Moreover, through a new tracking procedure, we illustrate how we developed a graphic simulation able to reinterpret the data from the simulation of the queuing networks model, in order to make it easier to check the effectiveness of the simulator and to have a graphical way to analyze the data.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 3; 273-294
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Queuing networks to evaluate web applications: modelling
    Autorzy:
    Pasini, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1940184.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska
    Tematy:
    traffic simulators
    queuing networks
    web application
    symulator ruchu
    kolejkowanie sieci
    aplikacja internetowa
    Opis:
    The aim of this work is to define a procedure for the modelling of a computer network for the simulation of the network traffic induced by the execution of web applications. The work consists in describing the objects of a library defined for modelling both the hardware and the software of the system. These are specific objects with an architecture based on complex queuing service structures. The objects of the library are used to both build the computer network model and describe the operation of a web application executed on the network in a distributed fashion.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 3; 197-214
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of a vehicular traffic system based on queueing network models: comparative analysis of two models
    Autorzy:
    Pasini, Leonardo
    Del Giudice, Nicola
    Powiązania:
    https://bibliotekanauki.pl/articles/1954603.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska
    Tematy:
    vehicular traffic systems
    queuing networks
    modeling
    simulation
    systemy ruchu kołowego
    sieci kolejkowe
    modelowanie
    symulacja
    Opis:
    In the previous works we presented a study for modeling and simulation of vehicular traffic systems based on queuing networks. Specifically, in paper (Pasini and Bianchini, 2019), we studied the urban network located in North Siena, in the city of Siena (Italy), in its actual layout, after the Municipality had introduced some changes for vehicular flow management. This system is based on two roundabouts and a crossroad, as shown in Figure 1. In this work, we are going to conclude our previous study, comparing the actual vehicular flow and the flow derived from an alternative system, foreseen by the PRG of the Municipality of Siena which is composed of three roundabouts and which has not been implemented yet.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2020, 24, 3; 243-292
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Queue-based simulators of P2P networks
    Autorzy:
    Pasini, L.
    Feliziani, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933180.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska
    Tematy:
    computer science engineering
    queuing system networks
    computer networks simulation
    communication system protocols
    voice over IP networks
    Opis:
    A technique is introduced for the construction of simulators of telecommunication networks based on the P2P protocol with a decentralized directory. The context of the application concerns P2P networks used both by sharing software and by telecommunication applications, as in VoIP applications. P2P systems have the advantages of boundless scalability and the break-up insensibility of devices, but suffer from heavy traffic of signals and network delays. Therefore, simulation of signal traffic in P2P networks is an important issue. The technique we have developed enables individuation of a generic P2P network's components and their functional characterization. We have worked at this level of description in order to determine the architecture of every component as a model of queues' networks. We have therefore defined a library of new types of objects for the construction of P2P network simulators with the Qnap2.V9 programming language. In this context, we have defined a procedure automatically generating the simulator of an any P2P network. During its execution, the procedure reads data from a file containing a description of the structure of the considered P2P network and values of the characteristic parameters of its components. Results related to the simulation of three configurations of a P2P network are introduced in Section 5 below. They differ according to the technology used to realize the local interconnection networks. The context of the present paper is a research program developed at the University of Camerino in defining specific computer procedures aimed at construction of simulators of telecommunication and computing networks. This technique also enables simulation of the software elaboration phases on computer networks and evaluation of the impact of specific choices concerning the structure of transmission protocols and operation paradigms of software applications [1, 2].
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 3; 203-235
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Construction of queue-based simulators for web applications distributed on computer networks
    Autorzy:
    Pasini, L.
    Feliziani, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964158.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska
    Tematy:
    queuing systems
    web-distributed applications
    computer networks simulation
    communication systems
    web interaction paradigms
    Opis:
    Modern Internet and web applications involve interactions among remote host computers connected by communication networks. Simulation modelling is an important technique to evaluate performance in the implementation of a web-distributed application over given networks formed by computer hosts connected by heterogeneous networks. In this paper we extend a previous work concerning the construction of a queue-based simulator of communication networks. We define a set of new queue-based object types which permit us to specify the behaviour of a web-distributed application whose software components run over different hosts in a given communication network. We apply this technique to show how to build a simulator to evaluate the performance of various software architectures for a web-distributed application run over a given computer network.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 4; 373-396
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical properties of a stochastic teletraffic system with MMPP input and an access function
    Autorzy:
    Tralhao, L.
    Craveirinha, J.
    Cardoso, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/309285.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    sieci telekomunikacyjne
    stochastic analysis
    telecommunication networks
    teletraffic theory
    GoS analysis
    teletraffic systems
    queuing systems
    Opis:
    Stochastic modeling of teletraffic systems with restricted availability and correlated input arrival rates is of great interest in GoS (grade of service) analysis and design of certain telecommunication networks. This paper presents some analytical properties of a recursive nature, associated with the infinitesimal generator of the Markov process which describes the state of a teletraffic system with MMPP (Markov modulated Poisson process) input traffic, negative exponentially distributed service times, finite queue and restricted availability defined through a loss function. Also the possible application of the derived properties to a direct method of resolution of the linear system, which gives the stationary probability distribution of the system, will be discussed.
    Źródło:
    Journal of Telecommunications and Information Technology; 2002, 3; 17-23
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementacja punktu dostępu do sieci standardu IEEE 802.11 ze wsparciem jakości świadczonych usług
    Implementation of access point of IEEE 802.11 standard with QoS support
    Autorzy:
    Natkaniec, M.
    Witosz, M.
    Kosek-Szott, K.
    Szott, S.
    Pach, A.R.
    Staniszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/298475.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    sieci WLAN
    punkt dostępu
    jakość obsługi
    funkcja EDCA
    mechanizmy kolejkowania
    WLAN networks
    access point
    quality of services
    EDCA function
    queuing disciplines
    Opis:
    W artykule zaprezentowano sposób implementacji mechanizmów zapewniania jakości świadczonych usług w projektowanym punkcie dostępu do sieci bezprzewodowej standardu IEEE 802.11. Zaprezentowano trzy sposoby zapewnienia QoS: dla warstwy łącza danych (przy użyciu funkcji EDCA standardu IEEE 802.11), dla warstwy sieciowej (przy użyciu dyscyplin kolejkowych) oraz schemat łączony Użycie tych mechanizmów w punkcie dostępu do sieci bezprzewodowej umożliwi zarówno poprawę jak i kontrolę jakości świadczenia usług w sieciach standardu IEEE 802.11.
    The paper is related to the implementation of mechanisms for providing QoS in access point based on IEEE 802.11 standard. Three different methods for providing QoS are showed: for the data link layer (using IEEE 802.11 function), for the network layer (using queuing disciplines), and for the both mentioned layers (using hybrid solution). These mechanisms allow for improving and proper control of services provisioning in IEEE 802.11 wireless local area networks.
    Źródło:
    Telekomunikacja Cyfrowa : technologie i usługi; 2010-2011, 10; 19-25
    1505-9405
    Pojawia się w:
    Telekomunikacja Cyfrowa : technologie i usługi
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Expected volumes of requests in systems of the queueing network with a limited number of waiting places
    Autorzy:
    Zając, P.
    Matalytski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/121834.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    sieci HM
    sieci kolejkowe
    system kolejkowy
    bezprzewodowy punkt dostępu
    HM-networks
    queueing network
    single-line queueing system
    queueing system
    queuing time
    limited queue
    demands total volume
    wireless access point
    volume of requests
    Opis:
    We present a method of finding the expected volume of requests in HM-network with homogeneous requests and bypass of the queueing systems of requests. The case was considered when the volume changes associated with the transitions between the states of the network are deterministic functions, depending on the state of the network and time, and the systems are single line. It is assumed that the probability of the states of the network systems, the parameters of the entrance flow of the requests and the service depend on the time.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2017, 22; 141-160
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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