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    Wyświetlanie 1-10 z 10
    Tytuł:
    Electromagnetic Field Generated by Wireless Alarm Devices
    Autorzy:
    Pospisilik, M.
    Vnencakova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/963854.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless communication
    power density
    electromagnetic field
    Opis:
    Together with the rise of importance of devices employing wireless networks based on the principle of radio frequency data transfers, also the discussion on harmfulness of the electromagnetic radiation has occurred. The authors of this paper obviously cannot provide unambiguous answers to stop this discussion. On the other way, they can provide the reader of this paper with real data obtained by measurements processed inside a semi anechoic chamber that were performed at several wireless alarm peripherals. The measured values are compared to the technical and hygienic standards so the reader can form an idea of the amount of the radiated energy. Moreover, examples of waterfall diagrams of spectra generated by the devices are also listed in this paper.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 1; 57-64
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wireless Capsule Endoscope Localization with Phase Detection Algorithm and Simplified Human Body Model
    Autorzy:
    Oleksy, Paweł
    Januszkiewicz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/226699.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless endoscope
    human body model
    wireless localization
    wireless communication
    Opis:
    Wireless endoscopic capsules can transmit the picture of the inside of the digestive tract to the external receiver for the purpose of gastrointestinal diseases diagnose. The localization of the capsule is needed to correlate the picture of detected anomalies with the particular fragment of intestine. For this purpose, the analysis of wireless transmission parameters can be applied. Such methods are affected by the impact of the human body on the electromagnetic wave propagation that is specific to the anatomy of individual person. The article presents the algorithm of localization of endoscopic capsules with wireless transmitter based on the detection of phase difference of received signals. The proposed algorithm uses simplified human body models that can change their dielectric properties in each iteration to improve the location of the capsule endoscope. Such approach allows to reduce localization error by around 12 mm (15%) and can by used for patients of different physique without the need of the numerical models of individual body.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 45-51
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radio Dispatching Communications During a Mass Event : A Case Studies of the “Lednica 2000” Youth Meetings
    Autorzy:
    Gierszal, Henryk
    Jarzina, Jacek
    Fryska, Sławomir
    Fryska, Sylwia
    Powiązania:
    https://bibliotekanauki.pl/articles/227019.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless communication
    dispatching network
    mass event
    energy sector
    radio broadcasting
    Opis:
    In paper we present a case study of the radio dispatching communications for providing the voice service during mass events of the “Lednica 2000” Youth Meetings. The presentation is supported by over 20-year experience in organization of this event every year. We also describe a FM radio system deployed during this meeting for broadcasting the English translation.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 231-236
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Wireless Communications Operated at Long-Wave Infrared Radiation
    Autorzy:
    Mikolajczyk, Janusz
    Szabra, Dariusz
    Prokopiuk, Artur
    Achtenberg, Krzysztof
    Wojtas, Jacek
    Bielecki, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/226104.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical wireless communication
    free space optics
    quantum cascade lasers
    optoelectronics
    telecommunications
    Opis:
    This paper presents some construction analysis and test results of a Free Space Optics system operating at the wavelength of 9.35 μm. In the system, a quantum cascade laser and a photoreceiver with mercury cadmium telluride photodetectors were used. The main parameters of these elements were discussed taking into account a data link operation. It also provides to determine a data range for various weather conditions related to scattering and scintillation. The results of numerical analyses defined the properties of currently available FSO technologies working in the near infrared or in the short infrared range of spectrum versus the performances of the developed system. The operation of this system was verified in three different test environments. The obtained results may also contain important issues related to the practical application of any FSO system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 2; 383-387
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Performance Analysis of a Tripleband Rectangular Slot Microstrip Patch Antenna for Wi-Fi, Wi-MAX and Satellite Applications
    Autorzy:
    Hossain, Md. Biplop
    Hossain, Md. Faruque
    Powiązania:
    https://bibliotekanauki.pl/articles/2055262.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless communication
    triple band antenna
    gain
    directivity
    transmission power
    link budget
    Opis:
    A triple-band microstrip patch antenna is presented in this article with detail investigation of its working mechanism and performance characteristics. The antenna consists of a rectangular slot on the patch to achieve multiband operation. Three distinct frequencies of 2.4 GHz, 5.5 GHz and 7.5 GHz are achieved with return losses of 27 dB, 29 dB and 29 dB respectively. The Impedance Bandwidths are 70 MHz (2.52 GHz-2.44 GHz) at 2.4 GHz, 220 MHz (5.65 GHz-5.43 GHz) at 5.5 GHz and 250 MHz (7.57 GHz-7.32 GHz) at 7.5 GHz, which satisfy the requirements of Wi-Fi, Wi-MAX and satellite communications bands. The fabricated prototype of the antenna has total dimension of 53×53×1.6 mm³ over FR4 substrate. The antenna is simple and has sensible radiation characteristics with considerable gain. This work also focuses on developing a Link Budget model for its application in satellite communication. Most notably, it examines overall system efficiency and optimum path loss, distance analysis, system noise temperature, signal to noise power ratio, the size of antenna and the overall customer satisfactions. The highest gain of the antenna is achieved as 3.5 dB in the band (5.65 GHz-5.43 GHz), while the highest directivity and bandwidth are found as 8.7 dBi and 250 MHz respectively in the higher operating band. The affordable agreement between the simulated and measuring outcomes justifies that the antenna is often applicable for Wi-Fi (2.4 GHz), Wi-MAX (5.25 – 5.85 GHz) and satellite (7.24 – 7.57 GHz) communications.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 2; 217--222
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ergodic Channel Capacity of PPM-Coded Optical MIMO Communications Under Combined Effects
    Autorzy:
    Cao, Minghua
    Zhang, Yue
    Kang, Zhongjiang
    Wang, Huiqin
    Powiązania:
    https://bibliotekanauki.pl/articles/1844525.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    atmospheric channel
    ergodic channel capacity
    pulse position modulation
    spatial correlation
    optical wireless communication
    Opis:
    The ergodic channel capacity of wireless optical multiple-input multiple-output (MIMO) system with pulse position modulation (PPM) is investigated. The combined effects of atmospheric turbulence, atmospheric attenuation, pointing error and channel spatial correlation are taken into consideration. The expression of ergodic channel capacity is derived, and is further performed by Wilkinson approximation method for simplicity. The simulation results indicated that the strong spatial correlation has the greatest influence on the ergodic channel capacity, followed by pointing errors and atmospheric turbulence. Moreover, the ergodic channel capacity growth brought by space diversity only performs well under independent and weakly correlated channels. Properly increasing the size and spacing of the receiving apertures is an effective means of effectively increasing the ergodic channel capacity.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 431-436
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the influence of the complex structure of clay hollow bricks on the values of electric field intensity by using the FDTD method
    Autorzy:
    Choroszucho, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/140952.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    building materials
    electromagnetic waves propagation
    finite-difference time-domain method (FDTD)
    wireless communication systems
    Opis:
    The study presents the analysis of the effects occurring at the propagation of electromagnetic waves within an area containing non-ideal, non-homogenous and absorbing dielectric. The analysed models are connected with housing constructions and include single and double-layered walls made of clay hollow bricks. The influence of the size of holes, the contained clay mass percentage and conductivity of brick on the distribution of electric field is presented. Double-layered wall causes more heterogeneity in distribution of electric field and numerous maxima and minima to compare with singlelayered construction. The presented results refer to the electromagnetic field generated by a wireless communication system (Wi-Fi), operating within the standard frequencies (2.4 GHz and 5 GHz). A FDTD method was used to the analysis of electric field distribution. Also in this paper all formulations of difference method (FDTD) is presented. The possibilities of modifying the described method are indicated too. The obtained values of electric field intensity allow to determining the attenuation coefficient for different variants of the walls. Detailed analysis of influence of different types of building construction will make it possible to better understand the wave phenomena and counteract local fading at planning of wireless networks systems.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 4; 745-759
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A PC-based operator and diagnostic panel for Simatic S7-200 programmable controllers
    Autorzy:
    Mazek, K.
    Chmiel, M.
    Kulisz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/141655.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    operator panel
    human machine interface (HMI)
    programmable logic controller (PLC)
    wireless communication
    microprocessor system
    Opis:
    The paper describes a prototype operator panel, which was designed to operate with the S7-200 family of Programmable Logic Controllers (PLC-s) from Siemens. Most of the functionality of the operator panel was implemented in a computer program, which runs on a PC-class computer. The program communicates with a PLC through its communication port configured in the Freeport mode. Two kinds of interface between the PC, and the PLC are supported: wired, and wireless. For wired connection a standard PC/PPI cable supplied by Siemens is used. For wireless connection two communication modules were designed, which operate in the free 433 MHz band. The operator panel program is intuitive, and easy to use. States of PLC inputs and outputs are presented using graphical objects. It is possible to modify states of the outputs, and monitor and edit any variable in the M and V memory in the PLC. The application supports also alarming. The program can be run on any computer with the MS Windows operating system installed. This makes the solution very cost-effective. Providing both wired and wireless communication radically increases flexibility of the proposed solution. The panel can be quickly mounted in areas, where pulling new cables is inconvenient, difficult or expensive.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 2; 307-320
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Testing of an Electronic Control System Based on STM X-Nucleo Board for Detection and Wireless Transmission of Sensors Data Applied to a Single-Seat Formula SAE Car
    Autorzy:
    Visconti, P.
    Sbarro, B.
    Primiceri, P.
    Fazio, R.
    Lay-Ekuakille, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/227232.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    telemetry
    sensors
    wireless monitoring
    data communication
    firmware
    electronic modules
    Opis:
    The emerging potentials in the electronics field, which facilitate the creation of complex projects with innovative functionalities, while maintaining low costs, are becoming even more appreciated by designers and engineers. In this manuscript, a telemetry system was designed and realized for monitoring main parameters of a racing vehicle. A STM32 Nucleo board acquires data from sensors installed on vehicle and transmits them to a base station. Acquired data are both stored on a SD card and wirelessly transmitted, for ensuring robustness/reliability of operation. The carried out tests confirm the truthfulness and compatibility of acquired data related to the vehicle parameters.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 4; 671-678
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LoRaWAN Communication Implementation Platforms
    Autorzy:
    Szewczyk, Joanna
    Nowak, Mariusz
    Remlein, Piotr
    Głowacka, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/2200714.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Long-Range (LoRa)
    intelligent building
    LPWAN
    wireless network
    security communication
    Smart City
    IoT
    Opis:
    A key role in the development of smart Internet of Things (IoT) solutions is played by wireless communication technologies, especially LPWAN (Low-Power Wide-Area Network), which are becoming increasingly popular due to their advantages: long range, low power consumption and the ability to connect multiple edge devices. However, in addition to the advantages of communication and low power consumption, the security of transmitted data is also important. End devices very often have a small amount of memory, which makes it impossible to implement advanced cryptographic algorithms on them. The article analyzes the advantages and disadvantages of solutions based on LPWAN communication and reviews platforms for IoT device communication in the LoRaWAN (LoRa Wide Area Network) standard in terms of configuration complexity. It describes how to configure an experimental LPWAN system being built at the Department of Computer Science and Telecommunications at Poznan University of Technology for research related to smart buildings.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 841--854
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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