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    Wyświetlanie 1-8 z 8
    Tytuł:
    AIOSAT - Autonomous Indoor & Outdoor Safety Tracking System
    Autorzy:
    Adin, Iñigo
    Zabalegui, Paul
    Perez, Alejandro
    Arrizabalaga, Jaione
    Goya, Jon
    Mendizabal, Jaizki
    Powiązania:
    https://bibliotekanauki.pl/articles/320458.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    GNSS
    Galileo
    EDAS
    tracking
    firefighting
    multisensor
    fusion
    communication optimization
    Opis:
    Even though satellite-based positioning increases rescue workers’ safety and efficiency, signal availability, reliability, and accuracy are often poor during fire operations, due to terrain formation, natural and structural obstacles or even the conditions of the operation. In central Europe, the stakeholders report a strong necessity to complement the location for mixed indoor-outdoor and GNSS blocked scenarios. As such, location information often needs to be augmented. For that, European Global Navigation Satellite System Galileo could help by improving the availability of the satellites with different features. Moreover, a multi-sensored collaborative system could also take advantage of the rescue personnel who are already involved in firefighting and complement the input data for positioning. The Autonomous Indoor & Outdoor Safety Tracking System (AIOSAT) is a multinational project founded through the Horizon 2020 program, with seven partners from Spain, Netherlands and Belgium. It is reaching the first year of progress (out of 3) and the overarching objective of AIOSAT system is to advance beyond the state of the art in tracking rescue workers by creating a high availability and high integrity team positioning and tracking system. On the system level approach, this goal is achieved by fusing the GNSS, EDAS/EGNOS, pedestrian dead reckoning and ultra-wide band ranging information, possibly augmented with map data. The system should be able to work both inside buildings and rural areas, which are the test cases defined by the final users involved in the consortium and the advisory board panel of the project.
    Źródło:
    Annual of Navigation; 2019, 26; 21-32
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EDAS (Egnos Data Access Service) differential GNSS corrections: a reliable free-of-charge alternative for precision farming in Europe
    Autorzy:
    Vázquez, J.
    Lacarra, E.
    Morán, J.
    Sánchez, M. A.
    González, A.
    Bruzual, J.
    Rioja, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/320569.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    GNSS
    Galileo
    EDAS
    tracking
    firefighting
    multisensor
    fusion
    communication optimization
    Opis:
    EDAS (EGNOS Data Access Service) is the EGNOS internet broadcast service, which provides free of charge access to the data collected and generated by the EGNOS infrastructure. EDAS disseminates over the Internet, both in real time and via an FTP archive, the raw data of the GPS, GLONASS (no commitment on GLONASS data is provided (1)) and EGNOS GEO satellites collected by the receivers located at the EGNOS reference stations, which are mainly distributed over Europe and North Africa. The EDAS services offer several types of GNSS data in various protocols and formats, such as DGNSS corrections. This paper reports on the results of some in-field tests conducted by ESSP and Topcon Agriculture to confirm the suitability of EDAS DGNSS corrections for precision farming in Europe. The European Commission (EC) is the owner of EGNOS system (including EDAS) and has delegated the exploitation of EGNOS to the European GNSS Agency (GSA). EDAS service provision is performed by ESSP, as EGNOS Services Provider, under contract with the GSA, the EGNOS program manager. In the ENC 2018 article “EDAS (EGNOS Data Access Service): Differential GPS corrections performance test with state-of-the-art precision agriculture system”, ESSP and Topcon Agriculture presented the results of the first in-field test conducted in a dynamic and real-life environment in the summer of 2017. The test results indicated that the EDAS DGNSS corrections could enable a reliable pass-to-pass accuracy performance for a wide range of precision agriculture applications and become an attractive solution for cereal farms, when the farm is located in the vicinity of an EGNOS reference station. In particular, Topcon Agriculture acknowledged that the observed performance was sufficient to support the following precision agriculture applications: spraying and spreading of any crop type, tilling and harvesting of cereal. Then, ESSP and Topcon Agriculture engaged in additional testing activities to further characterise the EDAS DGPS performance in different scenarios (i.e. at various European locations and with a variety of distances between the designated farm and the target EGNOS reference station). In each test, multiple runs with the rover tractors have been performed over the reference patterns predefined in the Topcon guidance systems. Data recorded during the tests has been analysed in detail, looking at the key performance indicators (e.g. cross track error and pass-to-pass performance) that characterize the EDAS DGPS performance for precision agriculture applications. Different techniques for the computation of the pass-to-pass accuracy performance have been used, including a procedure to measure live in the field and a post-processing alternative. The diversity of scenarios available allows drawing conclusions on the applicability of EDAS DGPS corrections (in terms of maximum distance from the target EGNOS station) for precision agriculture and also understanding the impact of operationally relevant aspects such as the quality of the mobile internet coverage (highly variable across Europe). The EDAS system and its architecture, the main types of data disseminated through EDAS services and the online information available to the EDAS users are introduced in this paper. In particular, the EDAS Ntrip service is described in detail, since it provides the differential corrections to the GPS and GLONASS satellites at the EGNOS reference stations in RTCM format, which are the basis for the present study. The article also reports on the results of the latest tests, which have been performed using Topcon receivers, vehicles and auto-steering systems. In all cases, two different Topcon guidance systems on board tractors were running simultaneously to assess the EDAS DGPS positioning performance with respect to a the reference provided by a top-performing RTK-based Topcon solution. The objective of this paper is to draw conclusions on the use of EDAS DGPS corrections as a reliable free-of-charge alternative for precision farming in Europe (especially for cereal farms), based on the available performance results from the testing campaign and the feedback from the involved precision agriculture experts.
    Źródło:
    Annual of Navigation; 2019, 26; 46-58
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic probability fields for risk assessment and guidance solutions
    Autorzy:
    Williams, Edwin
    Jin, Yan
    Powiązania:
    https://bibliotekanauki.pl/articles/320753.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    GNSS
    Galileo
    EDAS
    tracking
    firefighting
    multisensor
    fusion
    communication optimization
    Opis:
    Standard Guidance, Navigation, and Control (GN&C) systems take state data from a navigation system and create a trajectory that minimizes some a-priori determined cost function. These cost functions are typically time, money, weight, or any general physically realizable quantity. Previous work has been done to show the effectiveness of using risk as the sole objective function. However, this previous work used Poisson distributions and historical estimates to achieve this goal. In this paper we present the situation-risk assessment (SRA) method contained within the intelligent situation assessment and collision avoidance (iSC) platform. The SRA method uses data clustering, and pattern recognition to create a historically based estimate of guidance probabilities. These are then used in data driven, dynamic models to create the future probability fields of the situation. This probability, along with the other agent’s goals and objectives, are then used to create a minimum risk guidance solution in the nautical environment.
    Źródło:
    Annual of Navigation; 2019, 26; 33-45
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ILP modeling of many-to-many replicated multimedia communication
    Autorzy:
    Walkowiak, K.
    Bulira, D.
    Careglio, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/308697.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    ILP modeling
    many-to-many communication
    network optimization
    replica location
    Opis:
    On-line communication services were evolving from a simple text-based chats towards sophisticated videopresence appliances. The bandwidth consumption of those services is constantly growing due to the technology development and high user and business needs. That fact leads us to implement optimization mechanisms into the multimedia communication scenarios. In this paper, the authors concentrate on many-to-many (m2m) communication, that is mainly driven by the growing popularity of on-line conferences and telepresence applications. An overlay model where m2m flows are optimally established on top of a given set of network routes is formulated and a joint model where the network routes and the m2m flows are jointly optimized. In the models, the traffic traverses through replica servers, that are responsible for stream aggregation and compression. Models for both predefined replica locations and optimized server settlement are presented. Each model is being followed by a comprehensive description and is based on real teleconference systems.
    Źródło:
    Journal of Telecommunications and Information Technology; 2013, 3; 56-65
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The logical control of road traffic net and railway junction
    Autorzy:
    Wierzcholski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/241899.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    logical communication systems
    tracks optimization
    optimum road traffic
    logical functors for traffic kind
    Opis:
    The numerous tribology problems occurring in power-train and transport industry lead to wear of vehicles and trains as well as to wear of road or tracks. The choice of the proper way traffic or transport requires to select the kind of the way and the kind of the vehicles which shall be driving on the track. Especially the project designer demand the more and more information referring the wear of track anticipation in succeeding years of vehicle operation. Such wear of track anticipation is strictly connected with the choice of the kind of communication or traffic. To satisfy the abovementioned problem, it is necessary to construct the logical control system for road traffic. Mentioned logical system enables to control of management of the road traffic or railway junction. The presented in this paper logical system consists the description of the logical functors and their mutually connections. Here are introduced three kinds of functors namely, open functor, closed functor and special functor. Each logical functor describes the signal features which will be controlled. The various functor connections occurring in considered communication systems are determined from practical problems where the influence of various operating parameters on the wear effects is taking into account. The influence of numerous operating parameters on the wear effects are experimentally determined and implemented into the systems in the case if mentioned parameters are independent as well if are mutually connected. Moreover in this paper the various communication systems will be presented and will be suggested an algorithm construction of the optimum problem solutions presenting the equivalent and simultaneously most simple communication system.
    Źródło:
    Journal of KONES; 2015, 22, 2; 279-286
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of optimal steganographic method meeting given criteria
    Synteza optymalnej metody steganografii według wybranych kryteriów
    Autorzy:
    Vovk, O.
    Astrahantsev, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/407976.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    steganography
    watermarking
    optimization method
    communication channel
    steganografia
    cyfrowy znak wodny
    metody optymalizacji
    kanał komunikacyjny
    Opis:
    One of the steganography areas is digital watermarking. In this paper, the technique of comparative analysis of embedding information methods into an image was proposed. A comprehensive analysis of the most relevant steganographic methods of hiding information was made. Own method of embedding information in still images was synthesized. The possibility of studied methods to adapt to the real channels was evaluated for the first time. The robustness and security of steganographic systems based on the proposed method were also demonstrated.
    Jednym z obszarów steganografii jest osadzanie cyfrowych znaków wodnych. W niniejszej pracy zaproponowano metodykę analizy porównawczej metod osadzania informacji w obrazach. Została dokonana wszechstronna analiza najnowszych metod ukrywania informacji za pomocą steganografii. Opracowano własną metodę osadzania informacji w nieruchomych obrazach. Oceniono możliwość adaptowania się metod do charakterystyk rzeczywistych kanałów komunikacyjnych. Wykazano wiarygodność i bezpieczeństwo systemów steganograficznych wykorzystujących proponowaną metodę.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2015, 3; 27-34
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design Optimization and Trade-Offs of Miniaturized Wideband Antenna for Internet of Things Applications
    Autorzy:
    ul Haq, M. A.
    Kozieł, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/220987.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    compact antennas
    internet of things (IoT)
    communication devices
    numerical optimization
    footprint-reduction-oriented design
    Opis:
    Internet of Things (IoT) will play an important role in modern communication systems. Thousands of devices will talk to each other at the same time. Clearly, smart and efficient hardware will play a vital role in the development of IoT. In this context, the importance of antennas increases due to them being essential parts of communication networks. For IoT applications, a small size with good matching and over a wide frequency range is preferred to ensure reduced size of communication devices. In this paper, we propose a structure and discuss design optimization of a wideband antenna for IoT applications. The antenna consists of a stepped-impedance feed line, a rectangular radiator and a ground plane. The objective is to minimize the antenna footprint by simultaneously adjusting all geometry parameters and to maintain the electrical characteristic of antenna at an acceptable level. The obtained design exhibits dimensions of only 3.7 mm × 11.8 mm and a footprint of 44 mm2, an omnidirectional radiation pattern, and an excellent pattern stability. The proposed antenna can be easily handled within compact communication devices. The simulation results are validated through measurements of the fabricated antenna prototype.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 3; 463-471
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Information and communication technologies in teaching and learning english as foreighn language
    Autorzy:
    KOZLAKOVA, Galyna
    STRELCHENKO, Oksana
    Powiązania:
    https://bibliotekanauki.pl/articles/455728.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    Language
    Gadgets
    Information and Communication Technology (ICT)
    English Language teaching
    Multimedia Technology
    Advantages
    Disadvantages
    Optimization
    Strategies
    Opis:
    The integration of ICT in language learning has become essential in today’s teaching-learning environment because the impact of information and communication technology (ICT) on language learning has been recognized globally. Nowadays, there is a great variety of the technology in language teaching and learning: Radio, TV, CD Rom, Computers, C.A.L.L., the Internet, Electronic Dictionary, Email, Blogs and Audio Cassettes, Power Point, Videos, DVD’s or VCD’s. So when the world is fast becoming a global village, the use of modern technological gadgets to improve language learning has become very important as well as in teaching English as EFL. This paper aims at analyzing the necessity of IC technology to language teaching and bringing out the problems faced by its users to make teachers of English aware of the strategies to exercise them in an effective manner.
    Źródło:
    Edukacja-Technika-Informatyka; 2014, 5, 2; 95-101
    2080-9069
    Pojawia się w:
    Edukacja-Technika-Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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