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    Wyświetlanie 1-13 z 13
    Tytuł:
    A method to build network-of-queues-based simulators for communication systems
    Autorzy:
    Pasini, L.
    Feliziani, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954090.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska
    Tematy:
    queuing systems
    computer simulation
    communication systems
    Opis:
    In this study we build a library of new object types whose architecture is based on models of networks-of-queues to simulate communication networks. We also define a class of procedures to automatically generate a simulator of a generic communication network described by the library's objects.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 3; 333-358
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulating the spread of the BSE disease: a cellular automata approach
    Autorzy:
    Magdoń-Maksymowicz, M.
    Maksymowicz, A. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964173.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska
    Tematy:
    computer simulation
    disease spreading
    BSE
    cellular automata method
    Opis:
    The rules of evolution applied in the cellular automata approach may correspond to the propagation of the mad cow disease. In a computer simulation of the BSE disease's spread both inherited and infectious mechanisms are accounted for. The initial population of items is randomly distributed on a two-dimensional square lattice, Nx × Ny = 1000 × 1000, with a fraction of 1 percent the items already infected. Alternatively, faulty prions may spontaneously develop during the simulation with a very small frequency. Our results indicate a critical probability, pc, of BSE transmission, so that for p below the threshold the population recovers. For p > pc the disease is launched in the population with a dynamic equilibrium between the healthy and infected fractions of the population. The threshold is very sensitive to spatial clustering of the population and the detailed rules for the disease's onset, evolution and propagation.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 2; 179-185
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer simulations of one-dimensional coupled map lattices
    Autorzy:
    Boldrighini, C.
    Cosimi, G.
    Frigio, S.
    Pellegrinotti, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954066.pdf
    Data publikacji:
    1998
    Wydawca:
    Politechnika Gdańska
    Tematy:
    computer simulation
    one-dimensional models
    Ising model
    Lyapunov dimension
    Opis:
    We perform computer simulations of some one-dimensional models of coupled map lattices (CML) with symmetry and diffusive nearest neighbour coupling, to study Ising-type transitions. Such transitions appear to be related to the presence of a dip (minimum) in the plot of the Lyapunov dimension versus coupling parameter.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 1; 5-17
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new, effective method for computing the interaction potential of hard cyclic multimer systems
    Autorzy:
    Bilski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1940716.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska
    Tematy:
    hard cyclic multimer
    hard potential
    computer simulation
    Monte Carlo method
    Opis:
    Studies of effiiency of several methods for calculating the interaction potential of a pair of two-dimensional hard cyclic multimers - molecules formed by hard disks (atoms) placed at the vertices of a regular polygon - are reported in this work. Such hard-body particles, known as hard cyclic multimers, constitute a class of important reference systems in modeling structural and thermodynamic properties of molecular systems. A new method is proposed which can be easily implemented to Monte Carlo simulations of two-dimensional cyclic multimers and which is faster than the fastest method used previously.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 1; 5-13
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of road systems and queuing network models
    Autorzy:
    Pasini, L.
    Feliziani, S.
    Giorgi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964157.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska
    Tematy:
    queue systems
    vehicular traffic systems
    computer networks simulation
    Opis:
    The purpose of this paper is to describe the versatility of queuing network systems for modelling vehicular traffic flows in road systems. These techniques are applicable in a simulation context because of the complexity of the resulting models, which can not be solved by mathematical analytical solvers. Moreover, these techniques can be used to model and simulate the behaviour of an automatic control system of vehicular flow in the same frame.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 4; 397-408
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular order and dynamics of 5CB liquid crystals in confined space - computer simulation
    Autorzy:
    Gwizdała, W.
    Gburski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1940712.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska
    Tematy:
    liquid crystal
    5CB
    carbon nanostructure
    nanotube
    graphene
    computer simulation
    MD
    second rank order parameter
    Opis:
    We studied the dynamical and structural properties of an important nematic 4-n-pentyl-4’-cyanobiphenyl (5CB) mesogen placed near carbon allotropes (graphene, nanotube), using modeling and molecular dynamics simulations (MD). Every investigated nanosystem (a free cluster of 5CB, a 5CB cluster confined in a single-walled carbon nanotube, 5CB mesogens located between two graphene sheets, a 5CB thin layer on a single-walled carbon nanotube, a thin layer of a 5CB molecules near graphene plane) contains a liquid crystal cluster consisting of 5CB molecules (22–98 molecules). We also performed a computer experiment for a 5CB bulk sample (196 5CB mesogens) with periodic boundary conditions. The following observables were calculated for several temperatures: mean square displacement, radial distribution function and second rank order parameter of 5CB clusters. The obtained results from MD simulations were discussed and compared with the experimental data.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 1; 35-64
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular dynamics simulation of copolymers
    Autorzy:
    Banaszak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964087.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    molecular dynamics
    computer simulation
    copolymer
    diblock
    ionic copolymer
    diffusion
    structure factor
    equation of state
    thermodynamic properties
    Opis:
    A series of representative molecular dynamics simulations of model Lennard-Jones copolymer chains is presented. We report measurements of thermodynamic, structural and dynamic properties of our model copolymers. For neutral copolymers we confirm our version of thermodynamic perturbation theory of the first order, while for ionic copolymers we demonstrate microphase formation and the anisotropy of the counterion diffusion.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 1; 17-27
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic properties of the rectangular crystalline phase of planar hard cyclic pentamers
    Autorzy:
    Tretiakov, K. V.
    Wojciechowski, K. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1965832.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    elastic constants
    Poisson ratio
    hard molecule
    anisotropic body
    Monte Carlo simulations
    computer simulation
    close packing
    orientational phase transition
    Opis:
    Structural and elastic properties of the densest known solid phase of two-dimensional (2D) system of hard cyclic pentamers (each pentamer is composed of five discs which centres are placed at vertices of a perfect pentagon of sides equal to the disc diameter, delta) are studied by Monte Carlo simulations. The present study confirms that at high densities the pentamers form a 2D solid structure of rectangular lattice with two pentamers (which librate, without rotation, around their mean orientations) in the unit cell. Elastic constants calculated for this structure show that, in contrast to densely packed 2D hard cyclic heptamers (composed of seven discs of centres forming a perfect heptagon of sides equal to the disc diameter delta), the pentamers do not exhibit anomalous Poisson's ratios.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 3; 331-340
    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:
    Curie temperatures for the Ising model on Archimedean lattices
    Autorzy:
    Malarz, K.
    Zborek, M.
    Wróbel, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964143.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska
    Tematy:
    computer modelling and simulation
    Ising model
    phase transition
    critical parameter
    Opis:
    Critical temperatures for the ferro-paramagnetic transition in the Ising model are evaluated for five Archimedean lattices, basing on Monte Carlo simulations. The obtained Curie temperatures are 1.25, 1.40, 1.45, 2.15 and 2.80 [J/kB] for (3,12 do2), (4,6,12), (4,8 do 2), (3,4,6,4) and (3 do 4,6) lattices, respectively.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 4; 475-480
    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:
    EMOT - an evolutionary approach to 3D computer animation
    Autorzy:
    Kwaśnicka, H.
    Woźniak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943270.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska
    Tematy:
    gene expression programming
    computer animation
    simulation
    motion
    Opis:
    Key-framing and Inverse Kinematics are popular animation methods, but new approaches are still developed. We propose a new evolutionary method of creating animation - the EMOT (Evolutionary MOTion) system. It enables automation of motion of animated characters and uses a new evolutionary approach - Gene Expression Programming (GEP). Characters are controlled by computer programs, an animator providing the way of motion's evaluation. GEP works with a randomly selected initial population, using directed but random selection. Experiments have shown that the proposed method is capable of developing robust controllers.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 1-2; 71-86
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer analysis of the current-regulated delta modulator with hexagonal quantizer
    Autorzy:
    Nieznański, J.
    Iwan, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954050.pdf
    Data publikacji:
    1998
    Wydawca:
    Politechnika Gdańska
    Tematy:
    computer analysis
    current-regulated delta modulator
    hexagonal quantizer
    simulation research
    ac motor drive applications
    Opis:
    This paper reports extensive simulation research into the use of the hexagonal quantizer in current-regulated delta modulators (CRDMs) for AC motor drive applications. It is demonstrated that the hexagonal quantizer with an appropriately selected threshold significantly lowers the current harmonic distortion and dramatically reduces the switching frequency of inverter devices, as compared to the conventional CRDM. Basic information is given on how the simulations were organized and sequenced to ensure fast steady-state convergence, as well as minimize the required data transfers.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 1; 73-83
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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