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Search results for: communiation networks

  • Cost minimisation in unbounded multi-interface networks

    Publication

    - Year 2008

    W pracy badano problem odłączania niektórych urządzeń komunikacyjnych w wielointerfejsowych sieciach bezprzewodowych w taki sposób, by zapewnić realizację wymaganego grafu połączeń przy jednoczesnej minimalizacji zużycia energii. Sformułowano problem optymalizacyjny, podano wyniki dotyczące jego trudności i zaproponowano algorytmy optymalizacyjne dla wariantu, w którym liczba interfejsów komunikacyjnych jest potencjalnie nieograniczona...

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  • Quality of service in optical burst switched networks

    Publication

    - Theoretical and Applied Informatics - Year 2007

    In the paper analytical models of two service differentiation schemes for optical burst switched network: extended offset time based and PPS (Preemptive Priority Scheme) are revised. Also accordance of analytical models for those schemes is studied when complete class isolation is assumed. Furthermore authors introduce an analytical model which describes an effective degree of isolation when burst switched network employs both...

  • RSVP-TE as a reservation protocol for optical networks

    Publication

    - Year 2010

    In this paper, we consider the reservation of optical resources problem. We implement extensions for RSVP-TE (Resource ReSerVation Protocol with Traffic Engineering Extension) to achieve the new functionality for optical resources reservation. Based on ASON/GMPLS architecture we examine an open source implementation KOM RSVP-Engine and extend its functionality according to ITU-T and IETF recommendations. The transport plane consists...

  • Primary role identification in dynamic social networks

    Publication

    - Year 2011

    Identyfikacja ról w sieci społecznej jest jednym z podstawowych zagadnień analizy takich sieci. W artykule przedstawiamy nowe podejście do tego zagadnienia. Pokazujemy w jaki sposób można dokonać identyfikacji ról poprzez wykorzystanie zaproponowanego modelu zachowań aktorów. Model taki tworzą podgrafy wzorcowe oraz diagramy stanów okreslające sekwencje aktywności w zachowaniu aktorów. Na bazie wyznaczonych modeli zachowań oraz...

  • Traffic Modeling in IMS-based NGN Networks

    Publication

    - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Year 2011

    In the modern world the need for accurate and quickly delivered information is becoming more and more essential. In order to fulfill these requirements, next generation telecommunication networks should be fast introduced and correctly dimensioned. For this reason proper traffic models must be identified, which is the subject of this paper. In the paper standardization of IMS (IP Multimedia Subsystem) concept and IMS-based NGN...

  • Performance Evaluation of Preemption Algorithms in MPLS Networks

    Publication

    - International Journal of Electronics and Telecommunications - Year 2011

    Preemption is a traffic engineering technique in Multiprotocol Switching Networks that enables creation of high priority paths when there is not enough free bandwidth left on the route. Challenging part of any preemption method is to select the best set of paths for removal. Several heuristic methods are available but no wider comparison had been published before. In this paper, we discuss the dilemmas in implementing preemption...

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  • Application of wavelength division multiplexing in sensor networks

    Publication

    - Year 2012

    Over the past few years the need to acquire data on various parameters from a number of sensors grew. The need that led to the development of a network of sensors which enables simultaneous control and measurement in a wide range of applications. The aim of this article is to discuss a possibility of connecting a variety of sensors in a network that would utilize WDM technology. Wavelength Division Multiplexing is commonly used...

  • Ship Resistance Prediction with Artificial Neural Networks

    Publication

    - Year 2015

    The paper is dedicated to a new method of ship’s resistance prediction using Artificial Neural Network (ANN). In the initial stage selected ships parameters are prepared to be used as a training and validation sets. Next step is to verify several network structures and to determine parameters with the highest influence on the result resistance. Finally, other parameters expected to impact the resistance are proposed. The research utilizes...

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  • The Transmission Protocol of Sensor Ad Hoc Networks

    Publication

    - Year 2015

    This paper presents a secure protocol for a radio Ad Hoc sensor network. This network uses the TDMA multiple access method. The transmission rate on the radio channel is 57.6 kbps. The paper presents the construction of frames, types of packets and procedures for the authentication, assignment of time slots available to the node, releasing assigned slots and slots assignment conflict detection.

  • Overview of Scalability and Reliability Problem in SDN Networks

    Publication

    - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2016

    In the paper an overview of scalability and reliability in the SDN (Software Defined Networks) networks has been presented. Problems and limitations for guaranteeing scalability and reliability in SDN networks have been indicated. Known methods for assuring scalability and reliability in SDN networks have been described. Projects from research communities for resolving issues with scalability and reliability in SDN networks have...

  • Robustness in Compressed Neural Networks for Object Detection

    Publication

    - Year 2021

    Model compression techniques allow to significantly reduce the computational cost associated with data processing by deep neural networks with only a minor decrease in average accuracy. Simultaneously, reducing the model size may have a large effect on noisy cases or objects belonging to less frequent classes. It is a crucial problem from the perspective of the models' safety, especially for object detection in the autonomous driving...

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  • Service-based Resilience for Embedded IoT Networks

    Publication

    - Year 2020

    Embedded IoT networks are the backbone of safety-critical systems like smart factories, autonomous vehicles, and airplanes. Therefore, resilience against failures and attacks should be a prior concern already in their design stage. In this study, we introduce a service-based network model as an MILP optimization problem for the efficient deployment of a service overlay to the embedded network by meeting QoS and resilience requirements....

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  • Traffic Remapping Attacks in Ad Hoc Networks

    Publication

    - IEEE COMMUNICATIONS MAGAZINE - Year 2018

    Ad hoc networks rely on the mutual cooperation of stations. As such, they are susceptible to selfish attacks that abuse network mechanisms. Class-based QoS provisioning mechanisms, such as the EDCA function of IEEE 802.11, are particularly prone to traffic remapping attacks, which may bring an attacker better QoS without exposing it to easy detection. Such attacks have been studied in wireless LANs, whereas their impact in multihop...

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  • Rearrangeability in multicast Clos networks is NP-complete

    Publication

    - Year 2010

    Przestrajalność w polach Closa z połączeniami jeden do jeden jest problemem wielomianowym. W pracy pokazano, że w polach z połączeniami jeden do wiele problem ten jest NP zupełny.Three-stage elos networks are commutation networks with circuit switching. So far, graph theory has been very useful tool for solving issues related to these networks with unicast connections. This is so because if elos network is represented as a bipartite...

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  • Topology recognition and leader election in colored networks

    Publication

    - THEORETICAL COMPUTER SCIENCE - Year 2016

    Topology recognition and leader election are fundamental tasks in distributed computing in networks. The first of them requires each node to find a labeled isomorphic copy of the network, while the result of the second one consists in a single node adopting the label 1 (leader), with all other nodes adopting the label 0 and learning a path to the leader. We consider both these problems in networks whose nodes are equipped with...

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  • Cooperative Data Transmission in Wireless Vehicular Networks

    Publication

    - Year 2017

    The paper presents issues related to the cooperative transmission in wireless vehicular networks. Cooperative transmission involves the use of mobile terminals as relay stations to improve the transmission quality, improve network performance and reduce energy consumption. The paper presents the methods used to implement cooperative transmission and the types of cooperative networks.

  • Trust Management Method for Wireless Sensor Networks

    Publication

    - Year 2017

    A Wireless Sensor Network (WSN) is a network of spatially distributed autonomous sensors to monitor physical or environmental conditions, such as temperature, sound, pressure, etc. and to cooperatively pass their data to the main location. The first wireless network that bore any real resemblance to a modern WSN is the Sound Surveillance System (SOSUS), developed by the United States Military in the 1950s to detect and track Soviet...

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  • A METHOD OF TRUST MANAGEMENT IN WIRELESS SENSOR NETWORKS

    Publication

    - International Journal of Security, Privacy an d Trust Management - Year 2018

    The research problem considered in this paper is how to protect wireless sensor networks (WSN) against cyber-threats by applying trust management and how to strengthen network resilience to attacks targeting the trust management mechanism itself. A new method, called WSN Cooperative Trust Management Method (WCT2M), of distributed trust management in multi-layer wireless sensor networks is proposed and its performance is evaluated....

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  • Statistical significance of displacements in heterogeneous control networks

    Publication

    - Geodesy and Cartography - Year 2013

    This paper proposes a modification of the classical process for evaluating the statistical significance of displacements in the case of heterogeneous (e.g. linear-angular) control networks established to deformation measurements and analysis. The basis for the proposed solution is the idea of local variance factors. The theoretical discussion was complemented with an example of its application on a simulated horizontal control...

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  • Annual signals observed in regional GPS networks

    Publication
    • J. Bogusz
    • M. Figurski

    - Acta Geodynamica et Geomaterialia - Year 2014

    Abstract: This paper describes analyses concerning annual signals in GPS-derived coordinates. The data was processed in the Military University of Technology Local Analysis Centre with Bernese 5.0 software. We used observations from 129 permanent GPS stations which belong to the Polish Active Geodetic Network (ASG-EUPOS), for the period of GPS weeks 1465-1729, corresponding to about 5 years. The annual signals have been estimated...

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  • DETERMINATION OF VERTICAL DISPLACEMENTS IN RELATIVE MONITORING NETWORKS

    Publication

    - Archives of Civil Engineering - Year 2020

    The problem of determining displacements of objects is an important and current issue, in particular in terms of operational safety. This is a requirement that covers geodetic, periodic control measurements in order to determine horizontal and vertical displacements. The paper is focused on the analysis of vertical displacements. Geodetic measurements and their interpretation allow to reduce the risk of possible structural catastrophes....

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  • Region protection/restoration scheme in survivable networks

    Publication

    - Year 2005

    W artykule zaproponowano nowe podejście do zabezpieczania/odtwarzania obszarowego, gdzie scieżka zabezpieczająca chroni pewien obszar ścieżki aktywnej. Wykazano, że ta metoda utrzymuje zarówno czasy odtwarzania, jak i współczynnik wykorzystania zasobów w rozsądnych granicach. Ze względu na fakt, że zadanie znalezienia ścieżek aktywnych i ścieżek zabezpieczających jest NP-zupełne, autorzy stworzyli algorytm heurystyczny i pokazali,...

  • COMPARATIVE ANALYSIS OF ACTIVE GEODETIC NETWORKS IN POLAND

    Publication

    - Year 2017

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  • Communication methods at selected private universities in Gdańsk, Sopot and Gdynia in 2010

    Open Research Data
    open access

    A university, including a private one, is an organization serving the environment. Therefore, a necessary condition (especially in today's market situation) is the development of cooperation between universities and the environment. Creating mutual relations between universities with the environment, belongs to an important area of activity of this...

  • Communication and Cognition

    Journals

    ISSN: 0378-0880

  • WRITTEN COMMUNICATION

    Journals

    ISSN: 0741-0883 , eISSN: 1552-8472

  • Communication Reports

    Journals

    ISSN: 0893-4215 , eISSN: 1745-1043

  • COMMUNICATION MONOGRAPHS

    Journals

    ISSN: 0363-7751 , eISSN: 1479-5787

  • Communication & Medicine

    Journals

    ISSN: 1612-1783

  • COMMUNICATION THEORY

    Journals

    ISSN: 1050-3293 , eISSN: 1468-2885

  • Discourse & Communication

    Journals

    ISSN: 1750-4813 , eISSN: 1750-4821

  • Communication Quarterly

    Journals

    ISSN: 0146-3373 , eISSN: 1746-4102

  • Visual communication

    Journals

    ISSN: 1470-3572 , eISSN: 1741-3214

  • Communication Studies

    Journals

    ISSN: 1051-0974 , eISSN: 1745-1035

  • Communication Research

    Journals

    ISSN: 0093-6502 , eISSN: 1552-3810

  • Communication Review

    Journals

    ISSN: 1071-4421 , eISSN: 1547-7487

  • COMMUNICATION EDUCATION

    Journals

    ISSN: 0363-4523 , eISSN: 1479-5795

  • Communication Today

    Journals

    ISSN: 1338-130X

  • Communication Teacher

    Journals

    ISSN: 1740-4622 , eISSN: 1740-4630

  • Communication & Sport

    Journals

    ISSN: 2167-4795 , eISSN: 2167-4809

  • Physical Communication

    Journals

    ISSN: 1874-4907

  • STYLES OF COMMUNICATION

    Journals

    ISSN: 2065-7943 , eISSN: 2067-564X

  • Review of Communication

    Journals

    ISSN: 1535-8593

  • Communication and Management

    Journals

    ISSN: 2269-7195

  • Popular Communication

    Journals

    ISSN: 1540-5702 , eISSN: 1540-5710

  • Media and Communication

    Journals

    ISSN: 2183-2439

  • Geoscience Communication

    Journals

    ISSN: 2569-7102 , eISSN: 2569-7110

  • Language & Communication

    Journals

    ISSN: 0271-5309

  • Journal of Communication

    Journals

    ISSN: 0021-9916 , eISSN: 1460-2466

  • Communication and the Public

    Journals

    eISSN: 2057-0481