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    Wyświetlanie 1-19 z 19
    Tytuł:
    Network Topology Mutation as Moving Target Defense for Corporate Networks
    Autorzy:
    Rawski, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/227178.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cybersecurity
    MTD
    SDN
    NFV
    Opis:
    The paper introduces a topology mutation – the novel concept in Moving Target Defense (MTD). MTD is a new technique that represents a significant shift in cyber defense. Traditional cybersecurity techniques have primarily focused on the passive defense of static networks only. In MTD approach cyber attackers are confused by making the attack surface dynamic, and thus harder to probe and infiltrate. The emergence of Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technology has opened up new possibilities in network architecture management. The application of combined NFV and SDN technologies provides a unique platform for implementing MTD techniques for securing the network infrastructure by morphing the logical view of the network topology.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 4; 571-577
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Network Topology Effect on QoS Delivering in Survivable DWDM Optical Networks
    Autorzy:
    Kavian, Y.
    Rashvand, H.
    Leeson, M.
    Ren, W.
    Hines, E.
    Naderi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308960.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    dedicated path protection
    DWDM
    network topology
    optical networks
    QoS
    survivability
    Opis:
    The quality of service (QoS) is an important and considerable issue in designing survivable dense wavelength division multiplexing (DWDM) backbones for IP networks. This paper investigates the effect of network topology on QoS delivering in survivable DWDM optical transport networks using bandwidth/load ratio and design flexibility metrics. The dedicated path protection architecture is employed to establish diverse working and spare lightpaths between each node pair in demand matrix for covering a single link failure model. The simulation results, obtained for the Pan-European and ARPA2 test bench networks, demonstrate that the network topology has a great influence on QoS delivering by network at optical layer for different applications. The Pan-European network, a more connected network, displays better performance than ARPA2 network for both bandwidth/load ratio and design flexibility metrics.
    Źródło:
    Journal of Telecommunications and Information Technology; 2009, 1; 68-71
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Klasyfikacja chronionych w Polsce motyli z rodziny Papilionidae z wykorzystaniem wybranych topologii neuronowych
    Classification of protected Papilionidae butterflies using selected neural network topology
    Autorzy:
    Boniecki, P
    Mueller, W.
    Nowakowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/883223.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
    Tematy:
    zbiory danych
    klasyfikacja
    gatunki chronione
    obrazy cyfrowe
    sieci neuronowe sztuczne
    paziowate
    Papilionidae
    uczenie sie
    motyle
    Opis:
    Celem badań było porównanie zdolności klasyfikacyjnych modeli neuronowych, uczonych dwoma różnymi metodami: wzorcową oraz bezwzorcową. Klasyfikacji poddano wybrane owady należące do rodziny „Papilionidae”, które objęte są ochroną prawną na terenie Polski. Neuronowej klasyfikacji dokonano w oparciu o informację zakodowaną w postaci zbioru dwuwymiarowych obrazów owadów. Jako cechy reprezentatywne, stanowiące podstawę do klasyfikacji, przyjęto pięć dominujących kolorów występujących w ubarwieniu motyli. W celu porównawczym wygenerowano dwie topologie neuronowe: sieć typu MLP (ang. MultiLayer Perceptron: perceptron wielowarstwowy) uczonej technikami „z nauczycielem” orazsieæ Kohonena, która była uczona metodą „beznauczyciela”.
    The aim of this study was to compare the classification ability of neural models, learned with two different ways: with reference and without reference. Selected insects subjected to classification belong to the family “Papilionidae”, and are a subject to legal protection in Poland. Neural classification was based on the information encoded in the form of a file of two-dimensional images of insects. As representatives of features, which form the basis of the classification, adopted were five dominant butterflies colors. For comparison two neural topologies were generated: a network type MLP (Multilayer Perceptron) learned by method "with the teacher" and a neural network type Kohonen, which was learned by method „without a teacher”.
    Źródło:
    Technika Rolnicza Ogrodnicza Leśna; 2009, 03; 23-26
    1732-1719
    2719-4221
    Pojawia się w:
    Technika Rolnicza Ogrodnicza Leśna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation control of underwater vehicles using Multi Agent System
    Autorzy:
    Das, Bikramaditya
    Subudhi, Bidyadhar
    Pati, Bibhuti Bhusan
    Powiązania:
    https://bibliotekanauki.pl/articles/229747.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AUV
    Multi Agent System
    formation control
    switching network topology
    mild connectivity
    Opis:
    This paper proposes the development of a formation control algorithm of multiple acoustic underwater vehicles by employing the behaviour of autonomous mobile agents under a proposed pursuit. A robust pursuit is developed using the distributed consensus coordinated algorithm ensuring the transfer of information among the AUVs. The development of robust pursuit based on characteristics of multi-agent system is for solving the incomplete information capabilities in each agent such as asynchronous computation, decentralized data and no system global control. In unreliable and narrow banded underwater acoustic medium, the formation of AUVs based distributed coordinated consensus tracking can be accomplished under the constant or varying virtual leader’s velocity. Further, the study to achieve tracking based on virtual leader AUV’s velocity is extended to fixed and switching network topologies. Again for mild connectivity, an adjacency matrix is defined in such a way that an adaptive connectivity is ensured between the AUVs. The constant virtual leader vehicle velocity method based on consensus tracking is more robust to reduce inaccuracy because no accurate position and velocity measurements are required. Results were obtained using MATLAB and acquired outcomes are analysed for efficient formation control in presence of the underwater communication constraints.
    Źródło:
    Archives of Control Sciences; 2020, 30, 2; 365-384
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel accessibility metrics based on hierarchical decomposition of transport networks
    Autorzy:
    Kwatra, Divya
    Rao, Kalaga Ramachandra
    Bhatnagar, Vasudha
    Powiązania:
    https://bibliotekanauki.pl/articles/27311337.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    integral accessibility
    network topology
    weighted network
    k-core decomposition
    eigenvector centralit
    airlines network
    integralna dostępność
    topologia sieci
    sieć ważona
    dekompozycja k-rdzeniowa
    centralność wektora własnego
    sieć linii lotniczych
    Opis:
    Scientific analysis of public transport systems at the urban, regional, and national levels is vital in this contemporary, highly connected world. Quantifying the accessibility of nodes (locations) in a transport network is considered a holistic measure of transportation and land use and an important research area. In recent years, complex networks have been employed for modeling and analyzing the topology of transport systems and services networks. However, the design of network hierarchy-based accessibility measures has not been fully explored in transport research. Thus, we propose a set of three novel accessibility metrics based on the k-core decomposition of the transport network. Core-based accessibility metrics leverage the network topology by eliciting the hierarchy while accommodating variations like travel cost, travel time, distance, and frequency of service as edge weights. The proposed metrics quantify the accessibility of nodes at different geographical scales, ranging from local to global. We use these metrics to compute the accessibility of geographical locations connected by air transport services in India. Finally, we show that the measures are responsive to changes in the topology of the transport network by analyzing the changes in accessibility for the domestic air services network for both pre-covid and post-covid times.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 118; 139--160
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolutionary stable strategies in networked games: the influence of topology
    Autorzy:
    Kasthurirathna, D.
    Piraveenan, M.
    Uddin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/91531.pdf
    Data publikacji:
    2015
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    evolutionary game theory
    competing strategy
    evolutionary stability
    network topology
    Zero-determinant strategy
    Pavlov strategy
    players population
    topological stability
    cooperator strategy
    ewolucyjna teoria gier
    strategia współzawodnictwa
    stabilność ewolucyjna
    topologia sieci
    strategia Pavlova
    populacja graczy
    stabilność topologiczna
    strategia współpracy
    Opis:
    Evolutionary game theory is used to model the evolution of competing strategies in a population of players. Evolutionary stability of a strategy is a dynamic equilibrium, in which any competing mutated strategy would be wiped out from a population. If a strategy is weak evolutionarily stable, the competing strategy may manage to survive within the network. Understanding the network-related factors that affect the evolutionary stability of a strategy would be critical in making accurate predictions about the behaviour of a strategy in a real-world strategic decision making environment. In this work, we evaluate the effect of network topology on the evolutionary stability of a strategy. We focus on two well-known strategies known as the Zero-determinant strategy and the Pavlov strategy. Zero-determinant strategies have been shown to be evolutionarily unstable in a well-mixed population of players. We identify that the Zero-determinant strategy may survive, and may even dominate in a population of players connected through a non-homogeneous network. We introduce the concept of ‘topological stability’ to denote this phenomenon. We argue that not only the network topology, but also the evolutionary process applied and the initial distribution of strategies are critical in determining the evolutionary stability of strategies. Further, we observe that topological stability could affect other well-known strategies as well, such as the general cooperator strategy and the cooperator strategy. Our observations suggest that the variation of evolutionary stability due to topological stability of strategies may be more prevalent in the social context of strategic evolution, in comparison to the biological context.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2015, 5, 2; 83-95
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Overview on topology identification technologies for a low-voltage distribution network
    Autorzy:
    Haotian, Ge
    Jiuming, Zhong
    Powiązania:
    https://bibliotekanauki.pl/articles/27309955.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    data driven method
    low-voltage distribution network
    signal injection method
    topology identification
    Opis:
    The topology identification of low-voltage distribution networks is an important foundation for the intelligence of low-voltage distribution networks. Its accuracy fundamentally determines the effectiveness of functions such as power system state estimation, operational control, optimization planning, and intelligent electricity consumption. The low-voltage distribution network is composed of transformers, lines, and end users. The key task of topology identification is to distinguish the connection relationship between distribution transformers, low-voltage lines, and phase sequence with end users, which can be divided into transformer user relationship, line user relationship, and phase user relationship. At present, the main methods of low-voltage network topology identification can be divided into signal injection method and data analysis method. The signal injection method requires a large number of additional terminal devices and is difficult to promote. The data analysis method combines the characteristics of switch state, voltage, current, electrical energy, and other data to perform topology analysis. The commonly used methods include correlation analysis and feature learning. Finally, typical problems that urgently need to be solved in topology recognition and representation were proposed, providing a reference for the research and development of low-voltage distribution network topology automatic recognition technology.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 4; 1017--1034
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method for assessing the structural reliability of networks with undetermined topology
    Metoda oceny strukturalnej niezawodności sieci o nieokreślonej topologii
    Autorzy:
    Kniazieva, Nina
    Nenov, Alexey
    Kolumba, Irina
    Powiązania:
    https://bibliotekanauki.pl/articles/407950.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    network of undetermined topology
    structural reliability
    route rank
    number of routes of a certain rank
    upper and lower bound
    sieć o nieokreślonej topologii
    niezawodność strukturalna
    ranga ścieżki
    liczba ścieżek o określonej randze
    górny i dolny kres
    Opis:
    This paper shows the relevance of the task of assessing the structural reliability of networks with undetermined topology. Proposed is a method for assessing the structural reliability of networks of undetermined topology based on taking into account the basic structural characteristics of the network (the number of nodes and branches, the degree of network connectivity, the maximum allowable rank of paths, and others). To obtain an estimate of the structural reliability for a network of any dimension and any topology, expressions are proposed in the scientific research to determine the number of paths of various ranks, which must be taken into accountwhen calculating the structural reliability index by the upper and lower bounds method.
    Ten artykuł pokazuje znaczenie zadania polegającego na ocenie niezawodności strukturalnej sieci o nieokreślonej topologii. Proponowana jest metoda oceny niezawodności strukturalnej sieci o nieokreślonej topologii, która oparta jest na uwzględnieniu podstawowych cech strukturalnych sieci (liczba węzłów i rozgałęzień, stopień połączenia z siecią, maksymalna dopuszczalna ranga ścieżek itp.). Aby oszacowaćstrukturalnąniezawodność sieci o dowolnej wielkości i dowolnej topologii, badania naukowe proponują wyrażenia algebraiczne, które określają liczbę ścieżek o różnych rangach, które należy wziąć pod uwagę przy obliczaniu wskaźnika niezawodności strukturalnej, używając do tego metody opartej na kresach górnych i dolnych wskaźnika.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2020, 10, 1; 32-35
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A routing algorithm and a router architecture for 3D NoC
    Autorzy:
    Kanagasabapathi, Somasundaram
    Calicut, Chythanya
    Powiązania:
    https://bibliotekanauki.pl/articles/305713.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    3D topology
    router
    network on chip
    routing algorithm
    Opis:
    In recent years, the enhancement of microchip technologies has enabled large scale Systems-on-Chip (SoC). Due to sharp increase in number of processing elements, SoC faces various challenges in design and testing. Network on Chip (NoC) is an alternative technology to overcome the challenges in SoC design and testing. NoC emerged as a key architecture that allows one to optimize the parameters like power and area. In spite of its applications, NoC faces some real time challenges like designing an optimum topology, routing scheme and application mappings. In this paper, we address the main three issues on NoC, namely, designing of an optimal topology, routing algorithm and a router design for the topology. First, we propose a topology and a routing algorithm. We prove that our recursive network topology is Hamiltonian connected and we propose an algorithm for data packet transmissions, which is free from cyclic deadlocks and the algorithm maximizes the congestion factor. Our experimental results show that the proposed topology gives better performance in terms of average latency and power than the other topologies. Finally, we propose a router architecture for our 3D-NoC. The router architecture is based on shared buffers. Also, our experimental results indicate that the proposed router architecture consumes less area and power than the Virtual Channel architecture.
    Źródło:
    Computer Science; 2019, 20 (3); 369-383
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on resilience model of UAV swarm based on complex network dynamics
    Autorzy:
    Wei, Kunlun
    Zhang, Tao
    Chuanfu, Zhang
    Powiązania:
    https://bibliotekanauki.pl/articles/28328275.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    UAV swarm
    resilience
    SIS
    system dynamics
    topology
    Opis:
    Unmanned Aerial Vehicle (UAV) swarms are utilized in various missions and operated within an open environment that is prone to disruptions. The resilience of UAV swarms, an important requirement, mainly revolves around ensuring stable and uninterrupted operations. Malicious attacks can implement the adverse impacts of potential threats through swarm communication links. In this context, the SIS (Susceptible → Infected → Susceptible) method is suitable for describing the information transmission within UAV swarms. An enhanced resilience model of the UAV swarm is proposed in this study, which incorporates the factors of self-dynamics, dynamics of topology, dynamics of information transmission, and SIS into the complex network model. Self-dynamics refer to the internal dynamics of the drones. In this paper, dynamics of topology consist of three factors: the varying distance between drones, the incoming degrees of each drone, and the number of communication types between drones. Lastly, dynamics of information transmission are characterized by SIS. The model proposed in this paper has the capability to effectively capture changes in the network topology as well as the dynamics of the system, which are significant contributors to the loss of resilience. And then, the average number of susceptible drones is utilized as the metric to evaluate the resilience of the swarm. Furthermore, an experiment is conducted where a UAV swarm successfully carries out a surveillance mission to demonstrate the advantages of our proposed method. The proposed model not only enables the support of mission planning but also facilitates the design enhancements of UAV swarms.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 173125
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synteza bezkolizyjnych sieci jednoukładowych dla systemów wbudowanych
    Contention-free and application-specific Network-on-Chip generation for embedded systems
    Autorzy:
    Tomaszewski, R.
    Deniziak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/156627.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    systemy wbudowane
    sieci jednoukładowe NoC
    generowanie topologii
    szeregowanie zadań i transmisji
    embedded systems
    Network on Chip (NoC)
    topology generation
    computation and communication scheduling
    Opis:
    Praca prezentuje metodologię generowania dedykowanych topologii bezkolizyjnych dla systemów wbudowanych, realizowanych w architekturze sieci jednoukładowych (ang. Network on Chip, NoC). Kombinacja uszeregowania zadań i transmisji systemu z nowym sposobem doboru topologii i rutingu w sieci NoC eliminuje kolizje transmisyjne, zapewniając jednocześnie spełnienie ograniczeń czasowych nałożonych na projektowaną aplikację. Przeprowadzone eksperymenty dowodzą przewagi zaprezentowanego rozwiązania nad typowymi metodami budowania sieci NoC.
    Although Network-on-Chip (NoC) [1] architectures present an interesting alternative to bus-based multiprocessor systems-on-chip (MPSoCs), they also need some effort to tackle communication contention problem. In this work the authors propose an efficient approach to application-specific irregular topology generation for contention-free NoC. There is taken advantage of a priori knowledge of the communication characteristic of the application (embedded system) to perform computation, communication scheduling and route generation with regard to performance constraints (Fig. 1). In the result there is obtained customized and minimal topology. The clear benefits of the authors' approach are: complete removal of network contention, simple router architecture without virtual channels, minimal network topology (in term of links necessary to guarantee contentionless communication), which meets system latency constraint, and input model of the system derived from co-synthesis of the embedded systems domain [6]. As demonstrated through experiments, this approach achieves far better performance than typical, random mesh networks and is comparable with well-known bandwidth-based solutions [3] (Tables 1, 3). In the resource-requirement field (interconnection fabric, Table 2) the authors' NoC is more saving than meshes (on average of 35%) and bandwidth-based custom topologies (on average of 25%).
    Źródło:
    Pomiary Automatyka Kontrola; 2011, R. 57, nr 1, 1; 12-14
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pilot Agent-Driven Wireless Acoustic Sensor Network for Uninterrupted Data Transmission
    Autorzy:
    Ghosh, Utpal
    Mondal, Uttam K.
    Powiązania:
    https://bibliotekanauki.pl/articles/27312943.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    agent technology
    audio signal
    multipath routing
    partial topology
    WASN
    Opis:
    Wireless acoustic sensor networks (WASN) usually demand uninterrupted and reliable data transmissions and an efficient path from the source nodes to the destination nodes, thus ensuring reliable delivery of sensitive or critical data with the use of multipath routing protocols. This paper presents a novel agent-driven WASN relying on a set of static and mobile agents. In the proposed technique, the location address is functioned into the operating node and the destination node. Calculations of the midpoint between the operating and the destination nodes are followed by identifying the shortest path based on a reference axis, using a mobile agent and a location address. Such an approach aims to ensure maximum utilization of the communicating paths. Based on the information concerning partial topology of the network, the destination node computes the weight factor and multiple paths using node distances, energy ratios and efficiencies of specific links. Then, the destination node selects the appropriate path from the multiple paths available, to transmit the data. This article also analyzes the performance of the proposed system with various parameters taken into consideration and shows its efficiency in comparison to other existing techniques.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 4; 53--60
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Empirical Approach in Topology Control of Sensor Networks for Urban Environment
    Autorzy:
    Musznicki, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/309443.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    empirical approach
    node deployment
    sensor network
    topology control
    urban environment
    WSN
    Opis:
    Research into the topology control of Wireless Sensor Networks (WSNs) is geared towards modeling and analysis of methods that may be potentially harnessed to optimize the structure of connections. However, in practice, the ideas and concepts provided by researchers have actually been rarely used by network designers, while sensor systems that have already been deployed and are under continued development in urban environments frequently differ from the patterns and research models available. Moreover, easy access to diversified wireless technologies enabling new solutions to be empirically developed and popularized has also been conducive to strengthening this particular trend.
    Źródło:
    Journal of Telecommunications and Information Technology; 2019, 1; 47-57
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topology identification of low voltage distribution network based on current injection method
    Autorzy:
    Ge, Haotian
    Xu, Bingyin
    Chen, Wengyin
    Zhang, Xinhui
    Bi, Yongjian
    Powiązania:
    https://bibliotekanauki.pl/articles/1841282.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    current injection
    low-voltage distribution network
    topology identification
    prąd wtrysku
    sieć dystrybucyjna niskiego napięcia
    identyfikacja topologii
    Opis:
    The structure of the low-voltage distribution network often changes. The change of topology will affect fault detection, fault location, line loss calculation, etc. It leads to fault detection error, inaccurate positioning and abnormal line loss calculation. This paper presents a new method to automatically identify the topology of a low-voltage power grid by using the injection current signal. When the disturbance current signal is injected into the low-voltage line, the current upstream of the injection point will change, and the current downstream of the injection point will not be affected. It is proved theoretically by using the superposition principle. With this method, the disturbance current signal can be injected into the line in turn, and the topology can be identified by observing the change of the current in line. The correctness of the method is proved by Matlab simulation and laboratory verification.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 297-306
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Algorithms for reliable networks deployment in mesh topology with flow control
    Autorzy:
    Debita, G.
    Staniec, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/226158.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mesh
    network
    planning
    Opis:
    The article presents innovative methods for designing and controlling topology in mesh networks. The authors of the paper simulate the procedure of deploying a mesh structure and prove that the shortest path for such a network is also one with the least number of hops in the sense of intermediate nodes.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 1; 73-79
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topology of Complex Networks and Demand of Intraday Liquidity: Based on the Real-Time Gross Settlement System
    Autorzy:
    Tong, Mu
    He, Yi
    Powiązania:
    https://bibliotekanauki.pl/articles/1357655.pdf
    Data publikacji:
    2018-03-21
    Wydawca:
    Uniwersytet Warszawski. Wydział Nauk Ekonomicznych
    Tematy:
    network structure
    intraday liquidity
    real-time settlement
    liquidity management
    Opis:
    Based on the payments and settlement system, the influence of the topology of capital flow networks on the extra short-term liquidity demand is investigated. Through modelling the circulating mechanism of liquidity in a network, its different influencing factors are analysed. The factors relating to the strength of nodes and leakage of liquidity that influences the liquidity demands of real-time settlements are studied from the perspective of both the system and members, using different simulation methods. The results show that strength will lead the member’s liquidity demand to increase but the strength distribution will lead the system’s liquidity demand to decrease, in cases with no leakage effect or unchanged leakage effect. The liquidity demand of the entire system is positive compared to the amount of leakage effect but uncorrelated to the distribution of the leakage effect among members, if the effect of strength distribution is unchanged. If the effects of strength, strength distribution and leakage are changed together, the latter is the dominant factor that influences the liquidity demand of both system and members. The above findings are useful for the management and supervision of short-term liquidity demand in complex financial systems, and for liquidity risk management and liquidity rescue policymaking.
    Źródło:
    Central European Economic Journal; 2017, 2, 49; 50 - 61
    2543-6821
    Pojawia się w:
    Central European Economic Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Study of Wireless Sensor Networks Energy-Efficient Topologies and Power Save Protocols
    Autorzy:
    Niewiadomska-Szynkiewicz, E.
    Kwaśniewski, P.
    Windyga, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/309032.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    ad hoc networks
    energy conservation protocols
    topology control
    wireless sensor network
    Opis:
    Ad hoc networks are the ultimate technology in wireless communication that allow network nodes to communicate without the need for a fixed infrastructure. The paper addresses issues associated with control of data transmission in wireless sensor networks (WSN) - a popular type of ad hoc networks with stationary nodes. Since the WSN nodes are typically battery equipped, the primary design goal is to optimize the amount of energy used for transmission. The energy conservation techniques and algorithms for computing the optimal transmitting ranges in order to generate a network with desired properties while reducing sensors energy consumption are discussed and compared through simulations. We describe a new clustering based approach that utilizes the periodical coordination to reduce the overall energy usage by the network.
    Źródło:
    Journal of Telecommunications and Information Technology; 2009, 3; 68-75
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The method of determining of transmission properties of networks based on regular graphs topology
    Metoda badania właściwości transmisyjnych sieci o topologii grafów regularnych
    Autorzy:
    Ledziński, D.
    Śmigiel, S.
    Śrutek, M.
    Marchewka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/389780.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
    Tematy:
    network
    chordal rings
    graph
    quality
    capacity
    sieci
    pierścienie cięciwowe
    graf
    jakość
    wydajność
    Opis:
    The paper presents a methodology of study the properties of the transmission networks modeled by 3’rd and 4’th degree chordal rings, developed by the authors. Research methodology is based on two kinds of tests. First of them, measured the amount of data transmitted in different network structures using the HTTP protocol. The second, was measured quality of the received video stream, by the SSIM (Structural similarity) method. For testing, the set of virtual machines, connected by virtual network of 3rd and 4th chordal rings topology were used.
    W artykule zaprezentowano opracowaną przez autorów metodykę badania własności transmisyjnych sieci modelowanych przy pomocy grafów cięciwowych trzeciego i czwartego stopnia. W tym celu użyto dwóch testów. Jeden z nich polegał na pomiarze ilości danych przesyłanych w różnych strukturach sieciowych przy pomocy protokołu HTTP, natomiast w drugim mierzona była jakość odebranych obrazów w strumieniach video metodą porównawczą SSIM (Structural SIMilarity). Testy były wykonane według opracowanej przez autora koncepcji polegającej na wykorzystaniu zbioru maszyn wirtualnych połączonych pomiędzy sobą wirtualną siecią o topologii pierścieni cięciwowych trzeciego i czwartego stopnia.
    Źródło:
    Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy; 2014, 18; 11-22
    1899-0088
    Pojawia się w:
    Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwość wykorzystania sieci radiowych w topologii MESH do łączności bezprzewodowej pomiędzy agregatami rolniczymi
    Possibility of using radio networks in the MESH topology for wireless communications between farm machinery units
    Autorzy:
    Langman, J.
    Langman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/287350.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    sieć Wi-Fi
    MESH
    rolnictwo precyzyjne
    WiFi network
    precise agriculture
    Opis:
    W pracy przedstawiono możliwości zorganizowania sieci bezprzewodowej w miejscu pracy agregatów rolniczych wykorzystując technologię MESH. W rolnictwie precyzyjnym ciągły przepływ informacji między pracującymi w polu agregatami a siedzibą gospodarstwa jest niezmiernie istotny. Zaprezentowana technologia i topologia MESH pozwoli na utworzenie samoorganizującej się sieci bezprzewodowej, węzły ruchome tej sieci zainstalowane są na pracujących agregatach rolniczych.
    The paper presents possibilities to organise wireless networks in places where farm machinery units are operated, using the MESH technology. In precise agriculture, continuous flow of information between machinery units working in field and farm office is extremely important. Presented technology and MESH topology will allow to develop a self-organising wireless network; mobile nodes of this network are installed in working farm machinery units.
    Źródło:
    Inżynieria Rolnicza; 2008, R. 12, nr 7(105), 7(105); 129-134
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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