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    Wyświetlanie 1-8 z 8
    Tytuł:
    Suboptimal Approach to Distributed Detection in Cognitive Radio Networks
    Autorzy:
    Kumari, Shweta
    Praveena, Sirimilla
    Powiązania:
    https://bibliotekanauki.pl/articles/1839486.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    cognitive radio
    distributed detection
    energy detector
    myopic policy
    spectrum sensing
    Opis:
    In this paper a dynamic spectrum access (DSA) concept is explored for mitigating the paucity of spectral bandwidth in cognitive radio (CR) for opportunistic, dynamic access of the spectrum without any interference. Dynamic spectrum access schemes are proposed for a distributed cognitive radio network consisting of one secondary user (SU) and many primary users (PUs). The SU has to make decisions for accessing PU channels within discrete time slots. The design of sensing and access strategies that govern channel choice in each slot for near-optimal throughput performance of the SU may be formulated as a partially observable Markov decision process (POMDP). Furthermore, it is considered that the SU incurs a cost whenever it switches to a different channel. The switching cost is expressed in terms of delay, packet loss and packet overhead. In this work, the SU access policy based on a myopic approach is proposed and evaluated.
    Źródło:
    Journal of Telecommunications and Information Technology; 2021, 1; 32-36
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suboptimal Approach to Distributed Detection in Cognitive Radio Networks
    Autorzy:
    Kumari, Shweta
    Praveena, Sirimilla
    Powiązania:
    https://bibliotekanauki.pl/articles/1839473.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    cognitive radio
    distributed detection
    energy detector
    myopic policy
    spectrum sensing
    Opis:
    In this paper a dynamic spectrum access (DSA) concept is explored for mitigating the paucity of spectral bandwidth in cognitive radio (CR) for opportunistic, dynamic access of the spectrum without any interference. Dynamic spectrum access schemes are proposed for a distributed cognitive radio network consisting of one secondary user (SU) and many primary users (PUs). The SU has to make decisions for accessing PU channels within discrete time slots. The design of sensing and access strategies that govern channel choice in each slot for near-optimal throughput performance of the SU may be formulated as a partially observable Markov decision process (POMDP). Furthermore, it is considered that the SU incurs a cost whenever it switches to a different channel. The switching cost is expressed in terms of delay, packet loss and packet overhead. In this work, the SU access policy based on a myopic approach is proposed and evaluated.
    Źródło:
    Journal of Telecommunications and Information Technology; 2021, 1; 32-36
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Implementation of Efficient Inline DDoS Detector Based on AATAC Algorithm
    Autorzy:
    Wiśniewski, Piotr
    Sosnowski, Maciej
    Burakowski, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2200718.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DDoS
    Distributed Denial of Service
    traffic anomaly detection
    AATAC
    performance
    DPDK
    Opis:
    Distributed Denial of Service (DDoS) attacks constitute a major threat in the current Internet. These cyber-attacks aim to flood the target system with tailored malicious network traffic overwhelming its service capacity and consequently severely limiting legitimate users from using the service. This paper builds on the state-of-the-art AATAC algorithm (Autonomous Algorithm for Traffic Anomaly Detection) and provides a concept of a dedicated inline DDoS detector capable of real-time monitoring of network traffic and near-real-time anomaly detection. The inline DDoS detector consists of two main elements: 1) inline probe(s) responsible for link-rate real-time processing and monitoring of network traffic with custom-built packet feature counters, and 2) an analyser that performs the near-real-time statistical analysis of these counters for anomaly detection. These elements communicate asynchronously via the Redis database, facilitating a wide range of deployment scenarios. The inline probes are based on COTS servers and utilise the DPDK framework (Data Plane Development Kit) and parallel packet processing on multiple CPU cores to achieve link rate traffic analysis, including tailored DPI analysis.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 889--898
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on islanding detection of solar distributed generation based on best wavelet packet and neural network
    Autorzy:
    Xi, Zhongmei
    Zhao, Faqi
    Zhao, Xiangyang
    Peng, Hong
    Xi, Chuanxin
    Powiązania:
    https://bibliotekanauki.pl/articles/141157.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    active distribution network
    islanding detection
    neural network
    solar distributed generation
    wavelet pocket transform
    Opis:
    The active distribution network (ADN) represents the future development of distribution networks, whether the islanding phenomenon occurs or not determines the control strategy adopted by the ADN. The best wavelet packet has a better time-frequency characteristic than traditional wavelet analysis in the different signal processing, because it can extract better and more information from the signal effectively. Based on wavelet packet energy and the neural network, the islanding phenomenon of the ADN can be detected. Firstly, the wavelet packet is used to decompose current and voltage signals of the public coupling point between the distributed photovoltaic (PV) system and power grid, and calculate the energy value of each decomposed frequency band. Secondly, the network is trained using the constructed energy characteristic matrix as a neural network learning sample. At last, in order to achieve the function of identification for islanding detection, lots of samples are trained in the neural network. Based on the actual circumstance of PV operation in the ADN, the MATLAB/SIMULINK simulation model of the ADN is established. After the simulation, there are good output results, which show that the method has the characteristics of high identification accuracy and strong generalization ability.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 4; 703-717
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bayesian Network Based Fault Tolerance in Distributed Sensor Networks
    Autorzy:
    Lokesh, B. B.
    Nalini, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/308287.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    Bayesian network
    distributed sensor networks
    fault detection
    fault tolerance
    fault recovery
    network control
    routing
    Opis:
    A Distributed Sensor Network (DSN) consists of a set of sensors that are interconnected by a communication network. DSN is capable of acquiring and processing signals, communicating, and performing simple computational tasks. Such sensors can detect and collect data concerning any sign of node failure, earthquakes, floods and even a terrorist attack. Energy efficiency and fault-tolerance network control are the most important issues in the development of DSNs. In this work, two methods of fault tolerance are proposed: fault detection and recovery to achieve fault tolerance using Bayesian Networks (BNs). Bayesian Network is used to aid reasoning and decision making under uncertainty. The main objective of this work is to provide fault tolerance mechanism which is energy efficient and responsive to network using BNs. It is also used to detect energy depletion of node, link failure between nodes, and packet error in DSN. The proposed model is used to detect faults at node, sink and network level faults (link failure and packet error). The proposed fault recovery model is used to achieve fault tolerance by adjusting the network of the randomly deployed sensor nodes based on of its probabilities. Finally, the performance parameters for the proposed scheme are evaluated.
    Źródło:
    Journal of Telecommunications and Information Technology; 2014, 4; 44-52
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementacja algorytmu diagnostycznego H-G sondy pomiarowej analizatora tlenu FRT-02 do systemu DCS na bazie technologii Ethernet
    The implementation of the H-G diagnostic algorithm of the combustion oxygen analyzer FRT-02 into the system DCS using ETHERNET technology
    Autorzy:
    Francyk, J.
    Grzywa, K.
    Hardy, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/137216.pdf
    Data publikacji:
    2015
    Wydawca:
    Uczelnia Jana Wyżykowskiego
    Tematy:
    zdecentralizowany system sterowania
    DCS
    diagnostyka analizatora tlenu
    detekcja uszkodzeń
    distributed Control System
    diagnostics of oxygen analyzer
    fault detection
    Opis:
    W publikacji omówiono budowę i zasadę działania analizatora tlenu FRT-02 firmy Thomex jako urządzenia mechatronicznego, które może być włączone do sieci komputerowej obsługi procesu DCS. Wskazano na problemy eksploatacyjne analizatorów pracujących w przemysłowych sieciach DCS. Przedstawiono wyniki badań laboratoryjnych analizatora FRT-02 (sterowanego programem TransData) w postaci charakterystyk przepływowych i ciśnieniowych toru pneumatycznego o zadanych wartościach średnicy wewnętrznej D otworu przelotowego. Z otrzymanych charakterystyk wyznaczono wartości kryterialne – symptomy dla zaproponowanego algorytmu diagnostycznego H-G. Generowany na pulpicie operatora alarm zmusza obsługę do interwencji, aby nie dopuścić do utraty poprawnie działającego punktu pomiarowego. Opracowano modele matematyczne zapopielanego toru pneumatycznego w fazie przedmuchu sprężonym powietrzem.
    The paper presents a construction and working principle of the THOMEX combustion oxygen analyzer FRX-02 as a mechatronics system which can work in the computer system, attending the DCS process. The construction and exploitation problems of the analyzer working in the DCS industrial networks are also presented. The paper includes the results of the laboratory examination of the FRT-02 analyzer (controlling by the TransData program) presented in the form of the flow and pressure characteristics of the pneumatic channel with concrete diameters D, too. On this base it was setting the criterial values – the symptoms of the proposed H-G diagnostic algorithm. In the effect of the proposed algorithm it is generating the alarm which force the serviceman to take an action before losing the measurement point. The mathematical models of the ashed pneumatic channel in the blow-off faze, are also presented.
    Źródło:
    Zeszyty Naukowe Dolnośląskiej Wyższej Szkoły Przedsiębiorczości i Techniki. Studia z Nauk Technicznych; 2015, 4; 19-32
    2299-3355
    Pojawia się w:
    Zeszyty Naukowe Dolnośląskiej Wyższej Szkoły Przedsiębiorczości i Techniki. Studia z Nauk Technicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection and Control Problems for Non-Linear Distributed-Parameter Systems With Delays
    Autorzy:
    Namir, A.
    Lahmidi, F.
    Labriji, E. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/911203.pdf
    Data publikacji:
    2000
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    system z rozproszonymi parametrami
    detekcja
    sterowanie
    distributed-parameter systems
    non-linear discrete-time systems
    detection
    control
    fixed-point theorems
    Opis:
    First, we consider non-linear discrete-time and continuous-time systems with unknown inputs. The problem of reconstructing an input using the information given by an output equation is investigated. Then we examine a control problem for non-linear discrete-time hereditary systems, i.e. the problem of finding a control which drives the state of the system from its initial value to a given desired final state. The methods used to solve these problems are based on the state-space technique and fixed-point theorems. To illustrate the outlined ideas, various numerical simulation results are presented.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2000, 10, 3; 437-464
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Configuring a sensor network for fault detection in distributed parameter systems
    Autorzy:
    Patan, M.
    Uciński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/929887.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    metoda podziału i ograniczeń
    ograniczony plan eksperymentu
    układ o parametrach rozłożonych
    detekcja uszkodzeń
    estymacja parametryczna
    rozmieszczanie czujników
    branch-and-bound
    constrained experimental design
    distributed parameter system
    fault detection
    parameter estimation
    sensor location
    Opis:
    The problem of fault detection in distributed parameter systems (DPSs) is formulated as that of maximizing the power of a parametric hypothesis test which checks whether or not system parameters have nominal values. A computational scheme is provided for the design of a network of observation locations in a spatial domain that are supposed to be used while detecting changes in the underlying parameters of a distributed parameter system. The setting considered relates to a situation where from among a finite set of potential sensor locations only a subset can be selected because of the cost constraints. As a suitable performance measure, the Ds-optimality criterion defined on the Fisher information matrix for the estimated parameters is applied. Then, the solution of a resulting combinatorial problem is determined based on the branch-and-bound method. As its essential part, a relaxed problem is discussed in which the sensor locations are given a priori and the aim is to determine the associated weights, which quantify the contributions of individual gauged sites. The concavity and differentiability properties of the criterion are established and a gradient projection algorithm is proposed to perform the search for the optimal solution. The delineated approach is illustrated by a numerical example on a sensor network design for a two-dimensional convective diffusion process.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2008, 18, 4; 513-524
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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