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    Tytuł:
    Heuristic algorithms for optimization of task allocation and result distribution in peer-to-peer computing systems
    Autorzy:
    Chmaj, G.
    Walkowiak, K.
    Tarnawski, M.
    Kucharzak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/330970.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    system obliczeniowy P2P
    przetwarzanie rozproszone
    optymalizacja
    heurystyka
    algorytm ewolucyjny
    P2P computing system
    distributed computing
    optimization
    heuristics
    evolutionary algorithms
    Opis:
    Recently, distributed computing system have been gaining much attention due to a growing demand for various kinds of effective computations in both industry and academia. In this paper, we focus on Peer-to-Peer (P2P) computing systems, also called public-resource computing systems or global computing systems. P2P computing systems, contrary to grids, use personal computers and other relatively simple electronic equipment (e.g., the PlayStation console) to process sophisticated computational projects. A significant example of the P2P computing idea is the BOINC (Berkeley Open Infrastructure for Network Computing) project. To improve the performance of the computing system, we propose to use the P2P approach to distribute results of computational projects, i.e., results are transmitted in the system like in P2P file sharing systems (e.g., BitTorrent). In this work, we concentrate on offline optimization of the P2P computing system including two elements: scheduling of computations and data distribution. The objective is to minimize the system OPEX cost related to data processing and data transmission. We formulate an Integer Linear Problem (ILP) to model the system and apply this formulation to obtain optimal results using the CPLEX solver. Next, we propose two heuristic algorithms that provide results very close to an optimum and can be used for larger problem instances than those solvable by CPLEX or other ILP solvers.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 733-748
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mobile sensor routing for parameter estimation of distributed systems using the parallel tunneling method
    Autorzy:
    Zięba, T.
    Uciński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/907911.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sieć sensorowa
    układ o parametrach rozłożonych
    projekt optymalny
    obliczanie równoległe
    sensor network
    distributed parameter system
    optimum experimental design
    tunneling algorithm
    parallel computing
    Opis:
    The paper deals with the problem of optimal path planning for a sensor network with mutliple mobile nodes, whose measurements are supposed to be primarily used to estimate unknown parameters of a system modelled by a partial differential equation. The adopted framework permits to consider two- or three-dimensional spatial domains and correlated observations. Since the aim is to maximize the accuracy of the estimates, a general functional defined on the relevant Fisher information matrix is used as the design criterion. Central to the approach is the parameterization of the sensor trajectories based on cubic B-splines. The resulting finite-dimensional global optimization problem is then solved using a parallel version of the tunneling algorithm. A numerical example is included to clearly demonstrate the idea presented in the paper.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2008, 18, 3; 307-318
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical Approach to IP Scheduled Throughput Measurements in Dual Connectivity Systems
    Autorzy:
    Zięba, Arkadiusz
    Kollar, Martin
    Tatarczyk, Krzysztof
    Sadowski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/27311949.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    IP Scheduled Throughput
    distributed system
    Edge computing
    cloud
    Long Term Evolution (LTE)
    Evolved Universal Terrestrial Radio Access Network (E-UTRAN)
    Carrier aggregation (CA)
    UE Throughput
    Key Performance Indicator (KPI)
    Quality of Experience (QoE)
    quality of service (QoS)
    Opis:
    IP scheduled throughput defined according to 3GPP TS 36.314 reflects user throughput regardless of traffic characteristics, and therefore has become one of the most important indicators for monitoring Quality of Service (QoS) of the end user in Evolved Universal Terrestrial Radio Access Network (E-UTRAN). However, networks built on a distributed architecture make the above definition impossible to be applied directly due to the implementation challenges. This paper gives an overview of the classical Long Term Evolution (LTE) architecture as opposed to Dual Connectivity (DC) topology and focuses on a novel method of solving the calculation issue with the IP scheduled throughput measurement in edge computing environment. Experimental results show a good agreement with the real end user perception.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 4; 645--654
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System typu SoC do kryptoanalizy szyfrów opartych na krzywych eliptycznych
    System-on-Chip solution for cryptanalysis of elliptic curve based ciphers
    Autorzy:
    Orkiszewski, M.
    Wojciechowski, T.
    Rawski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/154686.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    kryptoanaliza
    obliczenia rozproszone
    system-on-chip
    SoC
    krzywe eliptyczne
    rho Pollard
    ECC
    ECDLP
    cryptanalysis
    distributed computing
    system on chip SoC
    elliptic curves
    Opis:
    W pracy zaprezentowano system typu SoC (System-on-Chip) zrealizowany w układach FPGA wspomagający obliczenia pozwalające na złamanie szyfru opartego na krzywych eliptycznych. Do ataku kryptoanalitycznego wykorzystano algorytm rho Pollarda. System zbudowany jest ze sprzętowych jednostek obliczeniowych HardRho pracujących pod kontrolą procesora NiosII i wykorzystuje interfejs Ethernet do komunikacji zewnętrznej. Omówiona została koncepcja budowy rozproszonego systemu obliczeniowego składającego się z jednostek obliczeniowych będących systemami typu SoC.
    Public-key cryptosystems allow secure connections and data exchange through unsafe communication channel without the need of a previous secure key exchange. One of popular cryptosystems used nowadays is Elliptic Curve Cryptosystems (ECC). Cryptanalytic attack on ECC system involves solving the Elliptic Curve Discrete Logarithm Prob-lem (ECDLP). The best known algorithm used to solve ECDLP is Pollard's rho method. So far successful attacks on ECC systems have mostly been based on distributed computer networks. In this paper a hardware cryptanalytic system is presented. The system is implemented in FPGA devices and performs computations of rho Pollard's algorithm. System is based on SoC solution (System-on-Chip) and works under control of a central server in order to form a greater distributed computing system. In the first paragraph of this paper there are presented the aim of work as well as the reasons for choosing FPGA devices and SoC solution. The second paragraph gives the theoretical background [3, 4, 5], explains the basic terms and presents the rho Pollard's algorithm [6, 7]. The third paragraph describes HardRho computation unit HardRho hardware (Fig. 1) and shows differences between the current and recent unit version of unit described in [8, 9]). The fourth paragraph of the paper deals with the SoC solution composed of several HardRho units, NiosII processor and Ethernet communication interface. The system structure (Fig. 2) and internal components [11, 12] are presented. The fifth paragraph is nfocused on the results of implementation and the estimated time of cryptanalysis of an elliptic curve ECC2-89 [1] (Tab. 1). The HardRho unit and [13] are compared (Tab. 2). The obtained results suggest high efficiency of the presented SoC solution. The future investigations and possible optimisation of the system are discussed.
    Źródło:
    Pomiary Automatyka Kontrola; 2010, R. 56, nr 7, 7; 745-748
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The CC1 project – system for Private Cloud Computing
    Autorzy:
    Chwastowski, J.
    Grzymkowski, R.
    Kruk, M.
    Nabożny, M.
    Natkaniec, Z.
    Olszewski, A.
    Pałka, H.
    Sobocińska, Z.
    Sośnicki, T.
    Szostak, M.
    Syktus, P.
    Wójcik, P.
    Wojtoń, T.
    Zdybał, M.
    Żabiński, B.
    Witek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/305307.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    virtual machine
    cloud computing
    private cloud
    distributed computing system
    Opis:
    The main features of the Cloud Computing system developed at IFJ PAN are described. The project is financed from the structural resources provided by the European Commission and the Polish Ministry of Science and Higher Education (Innovative Economy, National Cohesion Strategy). The system delivers a solution for carrying out computer calculations on a Private Cloud computing infrastructure. It consists of an intuitive Web based user interface, a module for the users and resources administration and the standard EC2 interface implementation. Thanks to the distributed character of the system it allows for the integration of a geographically distant federation of computer clusters within a uniform user environment.
    Źródło:
    Computer Science; 2012, 13 (2); 103-111
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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