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    Wyświetlanie 1-9 z 9
    Tytuł:
    A Queue Monitoring System in OpenFlow Software Defined Networks
    Autorzy:
    Rowshanrad, S.
    Namvarasl, S.
    Keshtgari, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/307860.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    Floodlight
    OpenFlow
    queue monitoring
    software defined networks
    Opis:
    Real-time traffic characteristic is different and it is very sensitive to delay. To meet traffic specications in real time, monitoring systems are used as an important part of networking. Many monitoring systems are deployed to have an update view of the network QoS parameters and performance. Most of these systems are implemented to measure QoS parameters in links. Here, in this paper, a system for monitoring queues in each link by means of Software Defined Networks is proposed. The monitoring system is implemented by extending Floodlight controller, which uses OpenFlow as southbound protocol. The controller has a centralized view of the network. By the help of OpenFlow it also can provide flow level statistics. Using these advantages, the proposed system can monitor delay and available bandwidth of a queue on a link or path. Despite of monitoring systems in traditional networks, the proposed monitoring system makes a low overhead in network thanks to OpenFlow protocol messages. It is also integrated into the network controller, which enables QoS and trac engineering applications to use the system's reports for automatic traffic management and QoS setup. The experimental results show a 99% accuracy of the proposed system for monitoring of both bandwidth and delay.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 1; 39-43
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Network management services based on the OpenFlow environment
    Autorzy:
    Wilk, P.
    Nawrocki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/305527.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    OpenFlow
    software-defined networks (SDN)
    management services
    load balancing
    Opis:
    The subject of this article is network management through web service calls, which allows software applications to exert an influence on network traffic. In this manner, software can make independent decisions concerning the direction of requests so that they can be served as soon as possible. This is important because only proper cooperation including all architecture layers can ensure the best performance, especially when software that largely depends on computer networks and utilizes them heavily is involved. To demonstrate that the approach described above is feasible and can be useful at the same time, this article presents a switch-level load balancer developed using OpenFlow. Client software communicates with the balancer through REST web service calls, which are used to provide information on current machine load and its ability to serve incoming requests. The result is a cheap, highly customizable and extremely fast load balancer with considerable potential for further development.
    Źródło:
    Computer Science; 2014, 15 (3); 253-270
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Routing policy validation for the integrated system supporting routing in Software Defined Networks (SDNRoute)
    Autorzy:
    Jaglarz, Piotr
    Rzym, Grzegorz
    Jurkiewicz, Piotr
    Boryło, Piotr
    Chołda, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/227234.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    congestion
    optimization
    quality of service (QoS)
    software-defined networks (SDN)
    validation
    Opis:
    In the article, a validation module, being a component of an integrated system supporting routing in software defined networks (SDNRoute), is proposed and thoroughly examined. The module allows for the verification of the results provided by the optimization module before these results are deployed in the production network. Routing policies are validated for their impact on the network quality parameters and against the threat of overloading (congestion).
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 77-83
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Graph-based fog computing network model
    Autorzy:
    Pysmennyi, Ihor
    Petrenko, Anatolii
    Kyslyi, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/1837778.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    software-defined networks
    fog computing
    smart sensors
    IoT
    sieci definiowalne programowo
    mgła obliczeniowa
    inteligentne czujniki
    Opis:
    IoT networks generate numerous amounts of data that is then transferred to the cloud for processing. Transferring data cleansing and parts of calculations towards these edge-level networks improves system’s, latency, energy consumption, network bandwidth and computational resources utilization, fault tolerance and thus operational costs. On the other hand, these fog nodes are resource-constrained, have extremely distributed and heterogeneous nature, lack horizontal scalability, and, thus, the vanilla SOA approach is not applicable to them. Utilization of Software Defined Network (SDN) with task distribution capabilities advocated in this paper addresses these issues. Suggested framework may utilize various routing and data distribution algorithms allowing to build flexible system most relevant for particular use-case. Advocated architecture was evaluated in agent-based simulation environment and proved its’ feasibility and performance gains compared to conventional event-stream approach.
    Źródło:
    Applied Computer Science; 2020, 16, 4; 5-20
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Software-Defined Networking Controller : the Distributed Active Information Model (DAIM)
    Autorzy:
    Pupatwibul, P.
    Banjar, A.
    Hossain, M. I.
    Braun, R.
    Moulton, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/226996.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distributed network
    OpenFlow
    DAIM model
    software defined networking
    next generation networks
    Opis:
    This paper presents a new OpenFlow controller: the Distributed Active Information Model (DAIM). The DAIM controller was developed to explore the viability of a logically distributed control plane. It is implemented in a distributed way throughout a software-defined network, at the level of the switches. The method enables local process flows, by way of local packet switching, to be controlled by the distributed DAIM controller (as opposed to a centralised OpenFlow controller). The DAIM ecosystem is discussed with some sample code, together with flowcharts of the implemented algorithms. We present implementation details, a testing methodology, and an experimental evaluation. A performance analysis was conducted using the Cbench open benchmarking tool. Comparisons were drawn with respect to throughput and latency. It is concluded that the DAIM controller can handle a high throughput, while keeping the latency relatively low. We believe the results to date are potentially very interesting, especially in light of the fact that a key feature of the DAIM controller is that it is designed to enable the future development of autonomous local flow process and management strategies.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 2; 209-216
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intrusion ascertainment by the analysis of surrounding wireless signals with software defined radio
    Analiza sygnałów bezprzewodowych z otoczenia a stwierdzenie intruzji za pomocą systemu radia definiowanego programowo
    Autorzy:
    Zawadzki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/408207.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    SDR
    software defined radio
    wireless networks
    signal detection
    radio definiowane programowo
    sieć bezprzewodowa
    detekcja sygnału
    Opis:
    The purpose of this study is the creation of an autonomous system based on software defined radio, with the ability to ascertain and compute wireless signals from the surrounding area. The analysis of previously obscure signals could allow the recognition of the alleged trespassing of the surveilled area.
    Celem pracy jest utworzenie autonomicznego systemu opartego o układ radia programowalnego, zdolnego wykrywać i przetwarzać sygnały bezprzewodowe z otoczenia. Analiza pojawienia się wcześniej niedostępnych sygnałów ma umożliwić rozpoznanie domniemanego naruszenia przestrzeni objętej obserwacją.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2016, 4; 18-21
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the Efficiency of UAV Communication Channels in the Context of Electronic Warfare
    Autorzy:
    Semendiai, Serhii
    Tkach, Yuliіa
    Shelest, Mykhailo
    Korchenko, Oleksander
    Ziubina, Ruslana
    Veselska, Olga
    Powiązania:
    https://bibliotekanauki.pl/articles/27311946.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    cognitive radio
    software-defined radio
    neural networks
    coding
    electronic warfare
    communication channel
    wireless communications
    spectrum analysis
    Opis:
    The article is devoted to the development of a method for increasing the efficiency of communication channels of unmanned aerial vehicles (UAVs) in the conditions of electronic warfare (EW). The author analyses the threats that may be caused by the use of electronic warfare against autonomous UAVs. A review of some technologies that can be used to create original algorithms for countering electronic warfare and increasing the autonomy of UAVs on the battlefield is carried out. The structure of modern digital communication systems is considered. The requirements of unmanned aerial vehicle manufacturers for onboard electronic equipment are analyzed, and the choice of the hardware platform of the target radio system is justified. The main idea and novelty of the proposed method are highlighted. The creation of a model of a cognitive radio channel for UAVs is considered step by step. The main steps of modelling the spectral activity of electronic warfare equipment are proposed. The main criteria for choosing a free spectral range are determined. The type of neural network for use in the target cognitive radio system is substantiated. The idea of applying adaptive coding in UAV communication channels using multicomponent turbo codes in combination with neural networks, which are simultaneously used for cognitive radio, has been further developed.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 4; 727--732
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of possible SDN use in the rapid prototyping processas part of the Industry 4.0
    Autorzy:
    Mazur, D.
    Paszkiewicz, A.
    Bolanowski, M.
    Budzik, G.
    Oleksy, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200245.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rapid prototyping
    software defined networking
    industry 4.0
    computer networks
    szybkie prototypowanie
    Przemysł 4.0
    sieć komputerowa
    SDN
    Opis:
    The article refers to the idea of using the software defined network (SDN) as an effective hardware and software platform enabling the creation and dynamic management of distributed ICT infrastructure supporting the rapid prototyping process. The authors proposed a new layered reference model remote distributed rapid prototyping that allows the development of heterogeneous, open systems of rapid prototyping in a distributed environment. Next, the implementation of this model was presented in which the functioning of the bottom layers of the model is based on the SDN architecture. Laboratory tests were carried out for this implementation which allowed to verify the proposed model in the real environment, as well as determine its potential and possibilities for further development. Thus, the approach described in the paper may contribute to the development and improvement of the efficiency of rapid prototyping processes which individual components are located in remote industrial, research and development units. Thanks to this, it will be possible to better integrate production processes as well as optimize the costs associated with prototyping. The proposed solution is also a response in this regard to the needs of industry 4.0 in the area of creating scalable, controllable and reliable platforms.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 21-30
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    27 dBm Microwave Amplifiers with Adaptive Matching Networks
    Autorzy:
    Rosolowski, D.
    Wojtasiak, W.
    Gryglewski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/226524.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Adaptive Power Amplifiers (APAs)
    components for Software Defined Radio
    multi-band devices
    multi-mode devices
    RF
    adaptivity
    tunable matching networks
    Opis:
    The paper describes adaptive amplifier design with varactors and pin diodes as regulators of matching networks. As examples the two amplifiers with SHF-0189 HFET transistor and different matching sections were designed and manufactured. The output power level of 27 dBm and gain higher than 13 dB within L and S-band have been achieved. The amplifier design methodology is based on the small-signal approach and DC characteristics of transistors and regulators. Amplifier adaptivity allows us to remotely control the chosen parameters such as: frequency range, output power level, gain and etc.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 103-108
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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