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    Wyświetlanie 1-13 z 13
    Tytuł:
    Sterowanie czujnikami w sieci ZIGBEE przy pomocy komend głosowych
    Controlling of sensors in the ZIGBEE network by means of voice commands
    Autorzy:
    Rogalski, J.
    Hasse, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/266464.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    sensorowa sieć bezprzewodowa
    standard IEEE 802.15.4
    sterowanie głosem
    wireless sensor network
    IEEE 802.15.4 standard
    voice controlling
    Opis:
    Przedstawiono bezprzewodową sieć sensorową, pobierającą i przekazującą informacje z czujników temperatury i oświetlenia sterowanych głosem. Funkcjonalność systemu może zostać wykorzystana do sterowania urządzeniami automatyki domowej. System składa się z trzech zasadniczych elementów: koordynatora sieci ZigBee, urządzenia końcowego (pomiarowego) wyposażonego w czujniki światła i temperatury oraz komputera PC. Użytkownik może zarządzać systemem za pomocą trzech interfejsów: komend głosowych rejestrowanych przez mikrofon, wyświetlacza TFT z panelem dotykowym oraz komputera PC z opracowanym oprogramowaniem. W koordynatorze zastosowano uproszczony algorytm rozpoznawania izolowanych słów przy pomocy współczynników LPC (Linear Predictive Coding). System został skonstruowany na popularnych mikrokontrolerach firmy STM z nowoczesnym mikroprocesorem ARM Cortex-M3.
    Wireless sensor network collecting and transferring information from temperature and lighting sensors controlled by means of operator’s voice has been presented. Functionality of the system can be applied for controlling of home automatic devices. The system consists of three main parts: ZigBee network coordinator, measuring terminals equipped in light and temperature sensors and computer PC. A user can manage the system by means of three interfaces: voice commands registered by the microphone, TFT display with touch panel and computer PC with elaborated software. In the coordinator the simplified algorithm of isolated words recognition by means of the LPC (Linear Predictive Coding) coefficients was applied. The system was realized using popular microcontrollers produced by STM with the modern microprocessor ARM Cortex-M3.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2011, 30; 109-112
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System sterowania czujnikami z wykorzystaniem sieci bezprzewodowej w standardzie IEEE 802.15.4
    Sensor controlling system with application wireless network in 802.15.4 standard
    Autorzy:
    Parol, B.
    Hasse, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/266706.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    sensorowa sieć bezprzewodowa
    standard IEEE 802.15.4
    protokoły komunikacji
    wireless sensor network
    IEEE 802.15.4 standard
    communication protocols
    Opis:
    Bezprzewodowe sieci sensorowe najczęściej wykorzystywane są w systemach pomiarowo-kontrolnych. Przy realizacji systemu wykorzystano mikrokontroler z rdzeniem Cortex-M3 jako kontroler sieci oraz przekaźniki ZigBee pracujące przy częstotliwości 2,4 GHz. System wymagał stworzenia modułów komunikacyjnych łączących kontroler i przekaźnik radiowy za pomocą interfejsu SPI oraz zaimplementowania stosu odpowiadającego potrzebom aplikacji. Opracowano oprogramowanie sterujące bezprzewodowo pracą urządzeń automatyki za pomocą mikrokontrolera STM32 w oparciu o standard IEEE 802.15.4 oraz kompleksowe, wielofunkcyjne sterowanie systemem z komputera PC.
    Wireless sensor networks are the most often used in measurement-control systems. A microcontroller with Cortex-CPU as a network controller and ZigBee transmitter working at 2.4 GHz have been applied in the presented system. Communication modules connecting the controller and the radio transmitter through SPI interface and a stack implementation related to requirements of the application had to been created. A software wirelessly controlling of automatics devices by means of the STM32 microcontroller in the IEEE 802.15.4 standard and the multifunctional controlling of the whole system from a PC have been prepared.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2010, 28; 119-122
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SVD Audio Watermarking: A Tool to Enhance the Security of Image Transmission over ZigBee Networks
    Autorzy:
    El-Bendary, M. A. M.
    El-Azm, A. A.
    El-Fishawy, N.
    Shawki, F.
    El-Tokhy, M. A. R.
    El-Samie, F. E. A.
    Krzemian, H. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/308392.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    audio watermarking
    copyright protection
    IEEE 802.15.4, SVD
    Opis:
    The security is important issue in wireless networks. This paper discusses audio watermarking as a tool to improve the security of image communication over the IEEE 802.15.4 ZigBee network. The adopted watermarking method implements the Singular-Value Decomposition (SVD) mathematical technique. This method is based on embedding a chaotic encrypted image in the Singular Values (SVs) of the audio signal after transforming it into a 2-D format. The objective of chaotic encryption is to enhance the level of security and resist different attacks. Experimental results show that the SVD audio watermarking method maintains the high quality of the audio signals and that the watermark extraction and decryption are possible even in the presence of attacks over the ZigBee network.
    Źródło:
    Journal of Telecommunications and Information Technology; 2011, 4; 99-107
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developments on an IEEE 802.15.4-based wireless sensor network
    Autorzy:
    Scheers, B.
    Mees, W.
    Lauwens, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/308225.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    wireless sensor networks
    IEEE 802.15.4
    effective data capacity
    positioning
    Opis:
    In this paper a summary is given of the ongoing research at the Belgian Royal Military Academy in the field of mobile ad hoc networks in general and wireless sensor networks (WSNs) in particular. In this study, all wireless sensor networks are based on the physical and the medium access layer of the IEEE 802.15.4 low rate wireless personal area networks standard. The paper gives a short overview of the IEEE 802.15.4 standard in the beaconless mode together with a description of the sensor nodes and the software used throughout this work. The paper also reports on the development of a packet sniffer for IEEE 802.15.4 integrated in wireshark. This packet sniffer turns out to be indispensable for debugging purposes. In view of future applications on the wireless network, we made a theoretical study of the effective data capacity and compared this with measurements performed on a real sensor network. The differences between measurements and theory are explained. In case of geograph- ically meaningful sensor data, it is important to have a knowledge of the relative position of each node. In the last part of the paper we present some experimental results of positioning based on the received signal strength indicators (RSSI). As one could expect, the accuracy of such a method is poor, even in a well controlled environment. But the method has some potential.
    Źródło:
    Journal of Telecommunications and Information Technology; 2008, 2; 46-53
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Building a wireless sensor network with use of RFM 12 modules - data exchange between nodes
    Autorzy:
    Mazur, D.
    Maciąg, P.
    Kielan, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/114472.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    IEEE 802.15.4 standard
    wireless sensor networks
    RFM modules
    ATmega processors
    Opis:
    IEEE 802.15.4 standard defines Physical (PHY) and Wireless Medium Access Control (MAC) layers for wireless sensor networks (WSN). In recent years, many types of wireless sensor networks have been developed based on this standard. Currently, probably the most popular implementation of the mentioned standard are wireless ZigBee networks. Moreover, ZigBee provides functions normally attributed to the higher layers of network protocol stack. Among those the most important functions are: routing of data, data encryption and providing redundancy connections between devices in the network. We present a slightly different approach to the construction of wireless sensor networks. This is the beginning of series of papers about implementation of the IEEE 802.15.4 standard and the previously mentioned expansion functions in the network, built with RFM wireless communication modules and ATmega processors. This paper describes the basics of compiling wireless connection and data transmission with using RFM modules. In addition, blocking and non-blocking types of connections between radio modules and ways to connect RFM modules with ATmega processors are described.
    Źródło:
    Measurement Automation Monitoring; 2015, 61, 9; 438-442
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wi-Fi networks in small and medium-sized businesses (SMB)
    Autorzy:
    Sojak, M.
    Głowacki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/93013.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
    Tematy:
    Wi-Fi
    wireless network
    small business
    medium business
    IEEE 802.11
    IEEE 802.15
    IEEE 802.16 standard
    WLAN
    wireless local area network
    Opis:
    Wi-Fi is quite a new technology on the market. This paper’s aim was to prove the justifiability and profitability of this technology use in the small and medium-sized businesses sector. Advantages and disadvantages of this kind of network were also shown. An issue connected with data and configuration elements security was also raised. Other wireless technologies were also presented.
    Źródło:
    Studia Informatica : systems and information technology; 2009, 1(12); 55-65
    1731-2264
    Pojawia się w:
    Studia Informatica : systems and information technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and Analysis of Additional Clear Channel Assessment to Improve Performance of IEEE 802.15.4-based MAC Protocol
    Autorzy:
    Asuti, Manjunath G.
    Basarkod, Prabhugoud I.
    Powiązania:
    https://bibliotekanauki.pl/articles/308709.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    clear channel assessment
    CSMA/CA mechanism
    IEEE 802.15.4
    MAC protocol
    wireless sensor networks
    Opis:
    Design of the MAC protocol is crucial in all wireless sensor networks (WSNs) due to its influence on the performance of the transceiver, i.e. the most energy-consuming component of each sensor node. A mechanism known as “carrier sense multiple access with collision avoidance” (CSMA/CA) is used for accessing the wireless channel in the IEEE 802.15.4 standard-based MAC protocol in order to avoid collisions between the network’s communicating nodes. CSMA/CA relies on two clear channel assessments (CCA=2) for checking the status of the channel. In this paper, we develop an additional CCA algorithm for the two scenarios encountered in star topology-enabled WSNs. Next, we investigate the impact of an additional clear channel assessment (CCA=3) on performance in IEEE 802.15.4. We develop a Markov chain model for the proposed methodology, and validate it using Matlab. Simulation results show that there is a significant improvement of performance metrics in the IEEE 802.15.4 standard-based MAC protocol with an additional CCA.
    Źródło:
    Journal of Telecommunications and Information Technology; 2020, 3; 10-21
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical Aspects of Physical and MAC Layer Security in Visible Light Communication Systems
    Autorzy:
    Blinowski, G. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226282.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless networks
    visible light communications
    wireless network security
    industrial wireless standards
    IEEE 802.15.7
    Opis:
    Visible light communication (VLC) has been recently proposed as an alternative standard to radio-based wireless networks. Originally developed as a physical media for PANs (Personal area Networks) it evolved into universal WLAN technology with a capability to transport internet suite of network and application level protocols. Because of its physical characteristics, and in line with the slogan "what you see is what you send", VLC is considered a secure communication method. In this work we focus on security aspects of VLC communication, starting from basic physical characteristics of the communication channel. We analyze the risks of signal jamming, data snooping and data modification. We also discuss MAC-level security mechanisms as defined in the IEEE 802.15.7 standard. This paper is an extension of work originally reported in Proceedings of the 13th IFAC and IEEE Conference on Programmable Devices and Embedded Systems - PDES 2015.
    Źródło:
    International Journal of Electronics and Telecommunications; 2016, 62, 1; 7-13
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wireless Communication Solution for Distributed Structural Health Monitoring
    Autorzy:
    Andrzejczak, A.
    Łęczycki, P.
    Makowski, M.
    Pękosławski, B.
    Pietrzak, P.
    Napieralski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226561.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless sensor networks
    IEEE 802.15.4
    Bluetooth Low Energy
    DASH7
    IEEE 802.11n
    ZigBee
    weightless
    structural health monitoring
    Opis:
    This paper describes a design of wireless distributed SHM (Structure Health Monitoring) system with a particular emphasis on comparison of wireless communication standards. The presented solution is being deployed in the TULCOEMPA project. Several wireless communication standards are compared, with their benefits, disadvantages and typical areas of application. A choice of proper ISM (Industrial Scientific Medical) band and reasons for use of Wireless Sensor Networks are also discussed. The last part of this paper presents the proposed structure and designed prototype. The chosen architecture of the system and the program algorithm used for communication and measurements are described.
    Źródło:
    International Journal of Electronics and Telecommunications; 2013, 59, 2; 177-184
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A proposed preamble channel estimation scheme for flip FBMC-based indoor VLC systems
    Autorzy:
    El-Ganiny, Mohamed Y.
    Khalaf, Ashraf A. M.
    Hussein, Aziza I.
    Hamed, Hesham F. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2063904.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    channel estimation
    filter bank multicarrier
    IEEE 802.15.7 standard
    interference approximation method
    visible light communication
    Opis:
    Filter bank multicarrier waveform is investigated as a potential waveform for visible light communication broadcasting systems. Imaginary inter-carrier and/or inter-symbol interference are causing substantial performance degradation in the filter bank multicarrier system. Direct current-biased optical filter bank multicarrier modulation overcomes all the problems of direct current-biased optical-orthogonal frequency division multiplexing modulation approaches in terms of speed and bandwidth. However, it also wastes a lot of energy while transforming a true bipolar signal into a positive unipolar signal by adding direct current-bias. In this paper, a flip-filter bank multicarrier-based visible light communication system was introduced to overcome this problem. In this system, a bipolar signal is converted to a unipolar signal by isolating the positive and negative parts, turning them to positive and then delivering the signal. Also, a new channel estimation scheme for a flip-filter bank multicarrier system is proposed which improves the channel estimation performance compared to that of each of the conventional schemes. The proposed system performance is measured in terms of bit error rate, normalized mean squared error, and constellation diagram. The superiority of the proposed scheme over other conventional structures has been successfully verified by MATLAB 2020b simulation experiments results. These results are evaluated under indoor visible light communication standard.
    Źródło:
    Opto-Electronics Review; 2022, 30, 1; art. no. e140859
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wireless communication for control of manipulation systems
    Autorzy:
    Belda, K.
    Rychnovský, V.
    Píša, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/229781.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distributed mechatronic system
    model-based control
    multi-level control
    odometry
    optical sensors
    standard IEEE 802.15.4
    ZigBee protocol
    Opis:
    The paper deals with a novel application of the wireless data communication for a continual control of the distributed manipulation systems. The solution is intended for industrial robotic plants. A considered way of the wireless communication is based on ZigBee protocol. The protocol is tested for a real time bidirectional data communication within a manipulation system. The system consists of several moving manipulation units, several stationary auxiliary units and one control computer. The computer provides the cooperation of all units in the system in relation to the user requirements. The system is controlled by a simple feedback multi-level control realized in MATLAB - Simulink environment. The paper is focused on the realization of the boards of power electronics, transmitters, optical positional sensors, optical gates and their networking in accordance with ZigBee protocol definition. The behavior of the ZigBee is illustrated by several records from real experiments.
    Źródło:
    Archives of Control Sciences; 2012, 22, 1; 29-41
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of energy consumption in 6TiSCH network nodes working in sub-GHz band
    Autorzy:
    Kubaszek, Mateusz
    Macheta, Jan
    Krzak, Łukasz
    Worek, Cezary
    Powiązania:
    https://bibliotekanauki.pl/articles/963844.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    IEEE802.15.4e
    TSCH
    6TiSCH
    energy
    modelling
    energy consumption
    wireless sensor networks
    industrial IoT
    mesh networks
    Opis:
    The 6TiSCH communication stack enables IPv6 networking over the TSCH (Time Slotted Channel Hopping) mode of operation defined in IEEE 802.15.4. Lately it became an attractive solution for Low power and Lossy Networks (LLNs), suitable for Industrial Internet (IIoT) applications. This article introduces a credible energy consumption model for the 6TiSCH network nodes, operating in the 863-870 MHz band. It presents the analysis leading to the construction of the model as well as verification through experimental measurements which showed 98% accuracy in determining power consumption for two different network topologies. The article includes reliable battery lifetime predictions for transit and leaf nodes along with other parametric study results.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 201-210
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    IEEE 802.15.4 wireless network application in real-time PLC-based control systems
    Autorzy:
    Krasiński, P.
    Pękosławski, B.
    Napieralski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/398098.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    wireless sensor network
    Modbus
    ZigBee
    IEEE 802.15.4
    PLC
    real-time
    industrial automation
    sieć czujników bezprzewodowych
    czas rzeczywisty
    automatyka przemysłowa
    Opis:
    Most of the modern industrial automation systems are based on Programmable Logic Controllers (PLC). Vast selection of communication networks are available for automation system designers. Nevertheless, contemporary standards were not designed with real-time wireless sensor networks in mind. Based on our experience in IEEE 802.15.4 networks and automation fields we discuss possible means which can make it possible to take most advantage of real-time wireless networks in traditional automation control systems.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2013, 4, 4; 170-174
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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