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    Wyświetlanie 1-7 z 7
    Tytuł:
    Traffic analysis using NetFlow and Python
    Analiza ruchu sieciowego z wykorzystaniem NetFlow i Python
    Autorzy:
    Oujezsky, V.
    Horvath, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/408122.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    IP network
    computer language
    software tools
    sieć IP
    język komputerowy
    oprogramowanie narzędziowe
    Opis:
    This article presents an application that is used as NetFlow collector and analyzer. It is a console application created in Python language. A software analyzer detects and analyzes incoming NetFlow messages version 1 and 5 of devices that support them. The output file is a database of information and analysis of the overall UNIX time duration of reported traffic and analysis of NetFlow lifetime. The software is developed to work with Python version 3 and higher and is designed for the Windows operating system.
    W artykule przedstawiono aplikację używaną jako kolektor i analizator NetFlow. Jest to aplikacja konsoli utworzona w języku Python. Analizator oprogramowania wykrywa i analizuje przychodzące wiadomości NetFlow w wersji 1 i 5 dla urządzeń je obsługujących. Plik wyjściowy to baza danych informacji i analizy ogólnego czasu trwania zgłoszonego ruchu UNIX i analizy życia NetFlow. Oprogramowanie zostało opracowywane dla systemu operacyjnego Windows i języka Python wersja 3 lub wyższa.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2017, 7, 2; 5-7
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deep data analysis in gigabit passive optical networks
    Autorzy:
    Horvath, T.
    Krkos, R.
    Dubravec, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/174869.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    GPONXpert
    gigabit passive optical networks
    GPON
    signalling
    user plane
    frame structure
    payload analysis
    Opis:
    This paper focuses on practical aspects of gigabit passive optical networks (GPON) diagnostics during deployment, for root-cause analysis and for research purposes. While GPON signalling analysis is already quite commonly used for diagnostics, the aim of this work is a holistic approach, including both signalling and user plane (payload) analysis. User plane analysis, especially if targeted at payload Ethernet, IP and transport layers, enables detection of additional group of problems that could limit or even prevent GPON internetworking and thus degrade the user perceived service quality. Integrated signalling and payload analysis is also interesting from the research point of view, leading to the ability to study equipment idiosyncrasies that would be hard to detect otherwise and it is also one of the enablers of equipment security verification. The mentioned theories were tested during a practical diagnostic session on a real GPON network deployment and this paper presents the findings.
    Źródło:
    Optica Applicata; 2017, 47, 1; 157-170
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel rogue optical network unit detection algorithm for gigabit passive optical networks
    Autorzy:
    Horvath, T.
    Munster, P.
    Dubravec, L.
    Filka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/174637.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gigabit passive optical network
    GPON
    rogue optical network unit
    ONU
    data analysis
    detection algorithm
    Opis:
    Passive optical networks are widely used as a promising solution for future access networks. Currently, the bandwidth is still increasing which means the current copper networks are not able to transfer new services such as 4K video, live streaming, etc. In other words, they reached their capacity limit. The passive optical networks rely on point-to-multipoint technology. That means each customer uses a share medium by time slots. Each time slot exactly specifies who and when is able to transfer data. In general, this control mechanism is implemented in the optical network unit by worst transmission convergence layer. On the other hand, there are cases when the optical network unit (it is called rogue optical network unit) does not follow instructions provided by the optical line termination, for example, if an attacker modifies a firmware of the end unit and/or when the control protocol is not loaded properly inside optical network unit. In worst case, the optical network unit transmits data in a continual mode (other optical network units cannot send data). Thestandard defines finding of the rogue optical network unit but it does not specify how the rogue optical network unit should be allocated because the frames of the rogue optical network unit do not contain the proper parameters. We realized a measurement in a real network with the rogue optical network unit and then we analyzed the captured data. A new algorithm for the rogue optical network unit allocation is presented. We do not consider any modification of the transmission convergence layer in gigabit passive optical networks.
    Źródło:
    Optica Applicata; 2016, 46, 3; 421-433
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Timing measurement and simulation of the activation process in gigabit passive optical networks
    Autorzy:
    Horvath, T.
    Munster, P.
    Jurcik, M
    Koci, L
    Filka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/173869.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gigabit passive optical network (GPON)
    GPON transmission convergence (TC) layer measurement
    transmission convergence (TC) layer simulation
    MATLAB
    GPON timing
    Opis:
    The passive optical networks are widely used nowadays. Service providers have many customers in their distribution networks. The most important thing for communication between the end unit and the control unit is an establishment contact. Design and measurement of the activation process between optical network unit and optical line termination is presented. In general, the service providers have a big split ratio (up to 1:128) due to the connection eminent value of the customers per optical line termination port in chassis. We present the simulation of the connection process for 16, 32, 64, and 128 optical network units and the measurement for single optical network unit (the GPON Xpert is able to read a single connection process). We compare our results in simulation discussion.
    Źródło:
    Optica Applicata; 2015, 45, 4; 459-471
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distributed Fiber-Optic Sensor for Detection and Localization of Acoustic Vibrations
    Autorzy:
    Sifta, R.
    Munster, P.
    Sysel, P.
    Horvath, T.
    Novotny, V.
    Krajsa, O.
    Filka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221858.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical fiber sensor
    acoustic vibrations
    detection
    localization
    phi-OTDR
    Opis:
    A sensing system utilizing a standard optical fiber as a distributed sensor for the detection and localization of mechanical vibrations is presented. Vibrations can be caused by various external factors, like moving people, cars, trains, and other objects producing mechanical vibrations that are sensed by a fiber. In our laboratory we have designed a sensing system based on the Φ-OTDR (phase sensitive Optical Time Domain Reflectometry) using an extremely narrow laser and EDFAs.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 1; 111-118
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cmac and Its Extensions for Efficient System Modelling
    Autorzy:
    Szabo, T.
    Horvath, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/908287.pdf
    Data publikacji:
    1999
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sieć neuronowa
    implementacja sprzętowa
    budowle hydrotechniczne
    CMAC
    neural networks
    hardware implementation
    Opis:
    This paper deals with the family of CMAC neural networks. The most important properties of this family are the extremely fast learning capability and a special architecture that makes effective digital hardware implementation possible. The paper gives an overview of the classical binary CMAC, shows the limitations of its modelling capability, gives a critical survey of its different extensions and suggests two further modifications. The aim of these modifications is to improve the modelling capability while maintaining the possibility of an effective realization. The basic element of the first suggested hardware structure is a new matrix-vector multiplier which is based on a canonical signed digit (CSD) number representation and a distributed arithmetic. In the other version, a hierarchical network structure and a special sequential training method are proposed which can constitute a trade-off between the approximation error and generalization. The proposed versions (among them a dynamic extension of the originally static CMAC) are suitable for embedded applications where the low cost and relatively high speed operation are the most important requirements.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 1999, 9, 3; 571-598
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutrient content restructuring and CT-measured density, volume attritions on damaged beans caused by Acanthoscelides obtectus Say (Coleoptera: Chrysomelidae)
    Autorzy:
    Keszthelyi, S.
    Egri, H.B.
    Horvath, D.
    Csoka, A.
    Kovacs, G.
    Donko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/65538.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    leguminous plant
    plant product
    nutrient content
    bean
    pest
    risk
    computer tomography
    Acanthoscelides obtectus
    Coleoptera
    Chrysomelidae
    density
    storage
    Opis:
    Leguminous plant products have great nutritional and economic importance in the European Union, which is reflected by its protein policy. These harvested yields are risked by stored product pests, such as Acanthoscelides obtectus Say, which can cause up to 50–60% loss in stored bean items. The bean weevil causes both quantitative and qualitative damage to seeds. We aimed to map the qualitative damage of this devastating pest, which deteriorates the nutritional content of bean kernels. Furthermore, our purpose was to determine accurately the decrease in the volume and density alteration in beans caused by this important stored product pest using CT-assisted imaging analysis. Our results showed that the nutritional arrangement in damaged beans was caused by A. obtectus. The measured nutrient content increment in damaged samples can be explained by the presence of extraneous organic material which originates from perished specimens of the bruchin pest. This is a negative phenomenon in bean items used as forage, because of the loss of valuable proteins and rancidity in herbal oils. Weight loss triggered by developing larvae was 49.42% in examined bean items. The use of 3D technologies has greatly improved and facilitated the detailed investigation of injured seeds. The density (75,834 HU; 41.93%) and the volume (296.162 mm3; 26.21%) values measured by CT of the examined samples were significantly decreased. The decreasing of tissue density in damaged beans can be accounted for by the consumption of starch present at a high ratio and that of the dense reserve components in the cotyledons.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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