Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "mobile communications" wg kryterium: Temat


Wyświetlanie 1-9 z 9
Tytuł:
Digital Audio Broadcasting or Webcasting: A Network Quality Perspective
Autorzy:
Gilski, P.
Stefański, J.
Powiązania:
https://bibliotekanauki.pl/articles/308048.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
broadcast technology
mobile communications
quality of experience
quality of service
wireless communication
Opis:
In recent years, many alternative technologies of delivering audio content have emerged, with different advantages and disadvantages. In this paper pros and cons of digital audio broadcasting and webcasting transmission techniques in a network quality perspective are described. A case study of user expectations with respect to currently available services is analyzed, and the perceived quality of real digital broadcasted and webcasted radio stations is examined.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 1; 9-15
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of GSM, LTE and Wi-Fi Electromagnetic Radiation in Dwellings
Autorzy:
Karan, Y.
As, N.
Şahın, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031943.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
wireless network adapter
electromagnetic radiation
electromagnetic pollution
global system for mobile communications
wireless fidelity
Opis:
Electromagnetic radiation exposure increases with the rise of the wireless communication devices. Electromagnetic radiation, especially near 2400 MHz band, has gradually increased with the widespread of wireless fidelity adapter in indoor environment. In this study, electromagnetic radiation in dwellings where different Wi-Fi adapters and routers are used was assessed by measuring the electric field and compared with other electromagnetic radiation source and the limits set by the Information and Communication Technologies Authority. Measurements were taken in the range of 760-2690 MHz bands used by GSM, 3G/LTE and Wi-Fi technologies. The detected values for all frequencies are significantly lower than the limits of the Information and Communication Technologies Authority. Among the electromagnetic radiation sources, electromagnetic radiation of Wi-Fi adapter is higher than GSM/3G/LTE sources radiation in dwellings. Electromagnetic radiation values in nearest point of high power adapter Wi-Fi antenna are close to the Information and Communication Technologies Authority limit value. Results show that electromagnetic radiation based on Wi-Fi adapters or routers can be higher than GSM based electromagnetic radiation.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 509-512
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occupational Exposure to Base Stations—Compliance With EU Directive 2004/40/EC
Autorzy:
Gajsek, P.
Simunic, D.
Powiązania:
https://bibliotekanauki.pl/articles/90688.pdf
Data publikacji:
2006
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
mobile communications
exposure assessment
compliance testing
prawo
prawo pracy
pole elektromagnetyczne
ocena ryzyka zawodowego
telefonia komórkowa
dyrektywa 2004/40/WE
Opis:
The rapid growth of mobile communications has not only led to a rising number of mobile telephones. It has also made base stations essential for services widespread on many roofs. However, not everyone is aware that working close to sources of high frequency electromagnetic fields (EMF), such as transmitter antennas for mobile phones, pagers and police, fire and other emergency services, can result in high EMF exposure. This paper deals with measurements and calculations of the compliance boundary for workers in one typical roof top base station setting according to EU Directive and other relevant EN standards.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2006, 12, 2; 187-194
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Key Management System in ETCS
Autorzy:
Franekova, M.
Chrtiansky, P.
Powiązania:
https://bibliotekanauki.pl/articles/393513.pdf
Data publikacji:
2009
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
radiokomunikacja ruchoma
otwarty system transmisji
GSM-R
KMS
zarządzanie
mobile communications
open transmission system
key management system
radio block centre
key management centre
on board unit
brute force attack
birthday paradox
Opis:
Paper deals with problems of KMS (Key Management System), which is developed in mobile communications GSM-R (Global System Mobile for Railway) recommended within the European Train Control System (ETCS), through the Euroradio system. Th e main part is oriented to safety procedures description of off-line KMS system between communication entities of ETCS system. In the experimental part the results of computational safety of modifi ed DES algorithm are summarised using special brute force attack to key – birthday paradox.
Źródło:
Archives of Transport System Telematics; 2009, 2, 1; 12-16
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analyses of Code Division Multiple Access (CDMA) Schemes for Global Mobile Satellite Communications (GMSC)
Autorzy:
Ilcev, D. S.
Powiązania:
https://bibliotekanauki.pl/articles/1841573.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Mobile Satellite Communications
Code Division Multiple Access
Multiple Access Technique
Satellite Communication Systems
Mobile Earth Station
orthogonal channels of transmission
GMSC Networks
very small aperture terminals
Opis:
This paper describes in particular Code Division Multiple Access (CDMA) applicable in Global Mobile Satellite Communications (GMSC). In satellite communication systems, as a rule, especially in GMSC networks many users are active at the same time. The problem of simultaneous communications between many single or multipoint mobile satellite users, however, can be solved by using Multiple Access Technique (MAT) system. Since the resources of the systems such as the transmitting power and the bandwidth are limited, it is advisable to use the channels with complete charge and to create a different MAT to the channel. This generates a problem of summation and separation of signals in the transmission and reception parts, respectively. Deciding this problem consists in the development of orthogonal channels of transmission in order to divide signals from various users unambiguously on the reception part.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 4; 805-810
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asynchronous Demodulation Method for Four SSB arranged on Frequency Axis in Mobile Radio Path using Hilbert Transform
Autorzy:
Daikoku, Kazuhiro
Powiązania:
https://bibliotekanauki.pl/articles/1844503.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
asynchronous demodulation
4-SSB
ISB
mobile radio path
Hilbert transform
HF/VHF band telecommunications
tactical communications
underwater communications
Opis:
In this paper, an asynchronous demodulation method for a four-single sideband (SSB) signal arranged on the frequency axis is developed to support burst mode transmission in a mobile radio path and to achieve greater data throughputs. When a reduced pilot carrier is placed at the center of the 4-SSB signal, it is guarded by lower and upper sidebands, that is, this scheme is classified into a tone-in-band (TIB) system. Digital signal processing (DSP) processors are useful for implementing a Hilbert transform. However, we have for a long time neglected introducing it into the demodulation process of SSB signals.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 3; 445-450
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geoinformational components of mobile appliances for «Smart City” problem solution: current state and prospects
Autorzy:
Duda, O.
Kunanets, N.
Matsiuk, O.
Pasichnyk, V.
Popyk, I.
Powiązania:
https://bibliotekanauki.pl/articles/411104.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
“Smart City” project
geoinformational components
city engineering communications
mobile appliance
big data
Opis:
The results of the investigation of geoinformational technologies application and their component in “Smart City” projects for planning and effective operation control of the city engineering communications by urban infrastructure and geospatial data flow are analyzed. The usefulness of information-technology appliances creation for complex information support of the local engineering communication network function control using the possibilities of geoinformational components is explained.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 2; 31-38
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of Multiple Access Techniques Applicable for Maritime Satellite Communications
Autorzy:
Ilcev, S. D.
Powiązania:
https://bibliotekanauki.pl/articles/116635.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Maritime Distress and Safety System (GMDSS)
Maritime Mobile Satellite Communications (MMSC)
Multiple Access (MA)
Multiple Access Techniques
Code Division Multiple Access (CDMA)
Time Division Multiple Access (TDMA)
Frequency Division Multiple Access (FDMA)
Random (Packet) Division Multiple Access (RDMA)
Opis:
In this paper are introduced fundamentals, characteristics, advantages and disadvantages of Multiple Access (MA) employed as transmission techniques in the Maritime Mobile Satellite Communications (MMSC) between ships and Coast Earth Station (CES) via Geostationary Earth Orbit (GEO) or Not-GEO satellite constellations. In fixed satellite communication, as a rule, especially in MMSC many users are active at the same time. The problem of simultaneous communications between many single or multipoint mobile satellite users can be solved by using MA technique, such as Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), Space Division Multiple Access (SDMA) and Random (Packet) Division Multiple Access (RDMA). Since the resources of the systems such as the transmitting power and the bandwidth are limited, it is advisable to use the channels with complete charge and to create a different MA to the channel. This generates a problem of summation and separation of signals in the transmission and reception parts, respectively. Deciding this problem consists in the development of orthogonal channels of transmission in order to divide signals from various users unambiguously on the reception part.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 529-540
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Training of higher education applicants through internet usage with the specialization in “Christian Pedagogy”
Szkolenie kandydatów na studia wyższe na specjalności „pedagogika chrześcijańska” z wykorzystaniem internetu
Autorzy:
Ryabova, Zoya
Sidanich, Tetiana
Powiązania:
https://bibliotekanauki.pl/articles/564520.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
Internet communications
educational and professional program
information
online designers
training of higher education applicants
mobile messengers
mobile learning
komunikacja internetowa
program edukacyjno-zawodowy
twórcy internetowi
szkolenie kandydatów na studia wyższe
mobilne komunikatory
mobilne nauczanie
Opis:
The article foreground the problem of the Internet usage for information exchange, the search for new knowledge and free access to educational services in the process of obtaining higher education in order to ensure lifelong learning of the individual. The names of domestic scholars having developed the issues of specialists training in higher educational institutions are given as well as the usage of computer technologies in the educational process and the content of training within the educational and professional program “Christian Pedagogy in Higher Education”. The content of the article analyzes the level of elaboration and feasibility of the united system of computer networks for theinformation exchange between scientific and pedagogical workers involved in the educational process and applicants for higher education; research methodology and its objectis determined. The results of given scientific work contain task assignment for future teachers training in Christian pedagogy, the general content of the relevant educational and professional program, the existing informational and educational environment, Internet communication channels. The article represents the essence and gives examples of mobile learning of students using the communication channel- Viber.
W artykule przedstawiono problematykę użytkowania Internetu w celu wymiany informacji, poszukiwania wiedzy i wolnego dostępu do usług edukacyjnych w procesie zdobywania wyższego wykształcenia w ramach realizacji nauki przez całe życie. Podano nazwiska krajowych naukowców, którzy rozwinęli problematykę szkoleń specjalistów w instytucjach edukacji wyższej. Zaprezentowano także sposób użytkowania technologii komputerowych w procesie edukacyjnym i opisano przebieg szkolenia w ramach edukacyjno-zawodowego programu Pedagogika chrześcijańska w edukacji wyższej. W artykule przeanalizowano stopień opracowania i zastosowania zintegrowanego systemu sieci komputerowej do wymiany informacji pomiędzy naukowcami i pracownikami naukowymi zaangażowanymi w proces edukacyjny oraz kandydatami na studia wyższe; określono metodologię badań i jej przedmiot. Wyniki przedstawionej pracy naukowej zawierają listę zadań dla przyszłych nauczycieli szkolących w zakresie pedagogiki chrześcijańskiej, zasadniczą treść programu edukacyjno-zawodowego, opis istniejącego środowiska informacyjnego i edukacyjnego oraz programów komunikacji internetowej. Artykuł przedstawia istotę i podaje przykłady mobilnej nauki studentów z użyciem komunikatora Viber.
Źródło:
Kultura – Przemiany – Edukacja; 2018, 6; 256-267
2300-9888
2544-1205
Pojawia się w:
Kultura – Przemiany – Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies