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Wyświetlanie 1-15 z 336
Tytuł:
Radio Number of Cycles and their Total Graphs
Autorzy:
Merlin, E. T.
Mangam, Tabitha Agnes
Powiązania:
https://bibliotekanauki.pl/articles/1177700.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Radio labeling
Radio number
Total graph
Opis:
A radio labeling f of G is an assignment of positive integers to the vertices of G satisfying, │f (u) – f (v)│≥ diam(G) + 1 - d (u ,v) ∀ u, v ∈ V (G) where d (u ,v) is the distance between any two vertices in the graph. The radio number denoted by rn (G) is the minimum span of a radio labeling for G. In this paper, an alternate proof for radio number of cycles and exact radio number for their total graphs has been discussed.
Źródło:
World Scientific News; 2018, 101; 55-64
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of a 4G/5G Base Station Using the srsRAN Software and the USRP Software Radio Module
Autorzy:
Flakowski, Wojciech
Krasicki, Maciej
Krenz, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/24200744.pdf
Data publikacji:
2023
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
base station
radio access network
radio channel power
radio link throughput
software-defined radio
user equipment
Opis:
This article presents the potential applications and scenarios for the implementation of a software-defined radio (SDR) module operating as a base station in 4G/5G networks. The paper presents test configurations of the srsRAN software environment in conjunction with various types of programmable radio modules. Then, the key performance metrics of the mobile telephony system and potential problems that may be encountered while implementing hardware and software layers are presented.
Źródło:
Journal of Telecommunications and Information Technology; 2023, 3; 30--40
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lessons Learned from WiMAX Deployment at INEA
Autorzy:
Kowalik, K.
Dudek, D.
Kołodziejski, M.
Musznicki, B
Grzybek, E.
Jarzina, J.
Powiązania:
https://bibliotekanauki.pl/articles/308259.pdf
Data publikacji:
2014
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
interference
radio capacity
radio planning
WiMAX
Opis:
Home broadband access is continuously demanding more bandwidth fueled by video streaming, entertainment and gaming applications. In 2010, a company INEA decided to roll-out new WiMAX-based services aimed to meet the needs of home users across theWielkopolska region of western Poland. It was decided to follow the 802.16e standard and the Time Division Duplexing (TDD) mode that oer the ability to adjust the downlink/uplink ratio and thus are well suited for data transmission. After an extensive testing period of equipment from various vendors, engineers at INEA have chosen the Motorola (currently Cambium Networks) PMP320 solution because it is compact and its components are space- and energy-ecient. The company choice was also influenced by its simple operation, management and installation, which ensured low costs of ownership. So far, this deployment has provided fast and aordable connectivity for Internet and telephony services to around 5,500 households across the 30,000 sq. km region. After 3 years of experience, INEA would like to share the lessons learned from this roll-out.
Źródło:
Journal of Telecommunications and Information Technology; 2014, 3; 34-41
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio numbers for generalized prism graphs
Autorzy:
Martinez, Paul
Ortiz, Juan
Tomova, Maggy
Wyels, Cindy
Powiązania:
https://bibliotekanauki.pl/articles/744118.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
radio number
radio labeling
prism graphs
Opis:
A radio labeling is an assignment c:V(G) → N such that every distinct pair of vertices u,v satisfies the inequality d(u,v) + |c(u)-c(v)| ≥ diam(G) + 1. The span of a radio labeling is the maximum value. The radio number of G, rn(G), is the minimum span over all radio labelings of G. Generalized prism graphs, denoted $Z_{n,s}$, s ≥ 1, n ≥ s, have vertex set {(i,j) | i = 1,2 and j = 1,...,n} and edge set {((i,j),(i,j ±1))} ∪ {((1,i),(2,i+σ)) | σ = -⌊(s-1)/2⌋...,0,...,⌊s/2⌋}. In this paper we determine the radio number of $Z_{n,s}$ for s = 1,2 and 3. In the process we develop techniques that are likely to be of use in determining radio numbers of other families of graphs.
Źródło:
Discussiones Mathematicae Graph Theory; 2011, 31, 1; 45-62
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of radio sports journalism in the city of Guayaquil (Ecuador)
Análisis del periodismo deportivo radiofónico en la ciudad de Guayaquil (Ecuador)
Autorzy:
Parra Proaño, Rubén
Cadena Chila, Evelin Lissette
Powiązania:
https://bibliotekanauki.pl/articles/1491238.pdf
Data publikacji:
2021-03-14
Wydawca:
Atena Research Association
Tematy:
Periodismo deportivo radiofónico
emisoras de radio de Ecuador
radioyentes
Radio sports journalism
Ecuador radio stations
radio listeners
Opis:
Objectives: This study analyzes radio sports journalism in the city of Guayaquil (Ecuador). Methods: The sample consisted of 111 people from the city of Guayaquil: 106 radio listeners and 5 radio sports journalists from the following radio stations in the city of Guayauil: Radio Sucre, La Radio Redonda, Radio Atalaya, Radio América and Master Music Radio. The 106 radio listeners answered a questionnaire designed for this study about radio sports journalism in the city of Guayaquil. Likewise, the 5 radio sports journalists were interviewed on this same topic. Findings: The results of this study reveal the situation of radio sports journalism in the city of Guayaquil. Conclusions: Radio sports journalism is very popular, with sports being the main theme in the radio stations of Guayaquil. The sport with the greatest coverage and audience is football. Radio listeners are satisfied with the radio presenters. The audience of traditional radios is higher than that of digital radios. The age of the radio listeners is very varied and online radios are more listened to by people between 15 and 40 years old. Traditional radios invest much more money than online ones, with sponsors having a special importance in digital radios.
Objetivos: El presente estudio analiza el periodismo deportivo radiofónico en la ciudad de Guayaquil (Ecuador). Métodos: La muestra estuvo compuesta por 111 personas de la ciudad de Guayaquil: 106 radioyentes y 5 periodistas deportivos radiofónicos de las siguientes radios de la ciudad de Guayauil: Radio Sucre, La Radio Redonda, Radio Atalaya, Radio América y Master Music Radio. Los 106 radioyentes contestaron a un cuestionario diseñado para esta investigación acerca del periodismo deportivo radiofónico en la ciudad de Guayaquil. Asimismo, los 5 periodistas deportivos radiofónicos fueron entrevistados sobre esta misma temática. Resultados: Los resultados del estudio dan a conocer la situación del periodismo deportivo radiofónico en la ciudad de Guayaquil. Conclusiones: El periodismo deportivo radiofónico goza de mucha popularidad, siendo el deporte la temática principal en las radios de Guayaquil. El deporte que mayor cobertura y audiencia tiene es el fútbol. Los radioyentes están satisfechos con los presentadores de los programas de radio. La audiencia de las radios tradicionales es superior a la de las radios digitales. La edad de los radioyentes es muy variada y las radios online son más escuchadas por personas de 15 a 40 años. Las radios tradicionales invierten mucho más dinero que las online, teniendo los patrocinadores especial importancia en las radios digitales.
Źródło:
Atena Journal of Sports Sciences; 2021, 3; 3-3
2695-4486
Pojawia się w:
Atena Journal of Sports Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intimate listening and sonic solidarity. Radio in the works of Radio Earth Hold collective as a way towards the sonic turn
Autorzy:
Wódz, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1788541.pdf
Data publikacji:
2021-05-27
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
radio
Radio Earth Hold
transmission art
sonic turn
sonic solidarity
natural radio
Opis:
At first glance, radio may seem to be an example of dated technology, overturned by other, more contemporary media. However, the beginning of the 21st century brought an upsurge of radio-related artworks alongside an increased theoretical interest around the broader topic of sound in culture – in response to W. J. T Mitchell’s ‘pictorial turn,’ the ‘sonic turn’ was introduced in 2004 by Jim Drobnick. In this article, I specifically focus on radio as a tool used in visual arts on the example of works by artistic/curatorial collective Radio Earth Hold, observed through the lens of ‘transmission arts’ – a term coined at the end of the 1990s, which recognizes the issue of transmission as political at its core. REH’s works render apparent the potential of the radio voice to become authoritarian as well as to create an intimate experience of listening. By building upon the idea of ‘sonic solidarity’ REH touches upon political topics in a way that can profoundly challenge our thinking and encourage us to reexamine not only the role of radio but also the transmission and communication in or via art – which perhaps could be understood as a way towards the possible sonic turn.
Źródło:
Ikonotheka; 2020, 30; 191-207
0860-5769
Pojawia się w:
Ikonotheka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio k-colorings of paths
Autorzy:
Chartrand, Gary
Nebeský, Ladislav
Zhang, Ping
Powiązania:
https://bibliotekanauki.pl/articles/743194.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
radio k-coloring
radio k-chromatic number
Opis:
For a connected graph G of diameter d and an integer k with 1 ≤ k ≤ d, a radio k-coloring of G is an assignment c of colors (positive integers) to the vertices of G such that
d(u,v) + |c(u)- c(v)| ≥ 1 + k
for every two distinct vertices u and v of G, where d(u,v) is the distance between u and v. The value rcₖ(c) of a radio k-coloring c of G is the maximum color assigned to a vertex of G. The radio k-chromatic number rcₖ(G) of G is the minimum value of rcₖ(c) taken over all radio k-colorings c of G. In this paper, radio k-colorings of paths are studied. For the path Pₙ of order n ≥ 9 and n odd, a new improved bound for $rc_{n- 2}(Pₙ)$ is presented. For n ≥ 4, it is shown that
$rc_{n-3}(Pₙ) ≤ \binom{n-2} {2}$
Upper and lower bounds are also presented for rcₖ(Pₙ) in terms of k when 1 ≤ k ≤ n- 1. The upper bound is shown to be sharp when 1 ≤ k ≤ 4 and n is sufficiently large.
Źródło:
Discussiones Mathematicae Graph Theory; 2004, 24, 1; 5-21
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio Graceful Hamming Graphs
Autorzy:
Niedzialomski, Amanda
Powiązania:
https://bibliotekanauki.pl/articles/31340550.pdf
Data publikacji:
2016-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
radio labeling
radio graceful graph
Hamming graph
Opis:
For $ k \in \mathbb{Z}_+ $ and $G$ a simple, connected graph, a $k$-radio labeling $ f : V (G) \rightarrow \mathbb{Z}_+ $ of $G$ requires all pairs of distinct vertices $u$ and $v$ to satisfy $ |f(u) − f(v)| \ge k + 1 − d(u, v) $. We consider $k$-radio labelings of $G$ when $ k = \text{diam} (G)$. In this setting, $f$ is injective; if $f$ is also surjective onto $ {1, 2, . . ., |V (G)|} $, then $f$ is a consecutive radio labeling. Graphs that can be labeled with such a labeling are called radio graceful. In this paper, we give two results on the existence of radio graceful Hamming graphs. The main result shows that the Cartesian product of $t$ copies of a complete graph is radio graceful for certain $t$. Graphs of this form provide infinitely many examples of radio graceful graphs of arbitrary diameter. We also show that these graphs are not radio graceful for large $t$.
Źródło:
Discussiones Mathematicae Graph Theory; 2016, 36, 4; 1007-1020
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
International radio broadcasting – a case of Radio Poland – an external service of Polish public radio
Autorzy:
Wielopolska-Szymura, Mirosława
Powiązania:
https://bibliotekanauki.pl/articles/514499.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Śląski. Wydział Nauk Społecznych
Tematy:
international broadcasting
radio broadcasting
Radio Poland
Polish Radio External Service
short waves
Opis:
Since its beginning radio has also been used as an instrument of international communication. Broadcast stations sending messages abroad began to appear shortly after the first wireless transmissions were successfully performed with the use of the Morse code. The discovery of radio waves enabled sending information on long distances without wire. This invention gave the new possibilities to communicate between continents, from ships to shores and back, or between military troupes during wartime. International broadcasting was also used to communicate with allies and with enemies during military conflicts. At that time an ability to transmit voice using radio waves had already been developed, then radio transmissions entered the dimension of entertainment as well as political communication with citizens and foreigners. The international voice broadcasting service has been developed from 1927 with the purpose of keeping the citizens in touch with the mother countries and also of helping the governments to disseminate its culture throughout the world. In this context the article is an analysis of the legal basis, purposes, directions and technical aspects of broadcasting, and organisational structure of the Radio Poland (former Polish Radio External Service).
Źródło:
Political Preferences; 2018, 19; 91-103
2449-9064
Pojawia się w:
Political Preferences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trends in Use of RF Spectrum
Autorzy:
Strużak, R.
Powiązania:
https://bibliotekanauki.pl/articles/308169.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
radio communication hyperspace
radio frequency spectrum resources
radio regulations
spectrum engineering
spectrum management
Opis:
This paper reviews possible improvements in the use of radio waves for carrying information from an engineering viewpoint. A few new concepts are proposed, which reduce the problem to an arrangement of solids in a multidimensional space.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 4; 95-100
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Community Radio in Hungary and Its Place in the Society, Politics, and Education
Autorzy:
Doliwa, Urszula
Velics, Gabriella
Powiązania:
https://bibliotekanauki.pl/articles/31343160.pdf
Data publikacji:
2023-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Hungary
community radio
media in Hungary
Tilos Radio
EPER Radio
media in CEE
Opis:
This article examines the community radio scene in Hungary, focusing on two stations in Budapest: Tilos Radio and EPER Radio. The authors explore the unique characteristics and principles of community radio in Hungary through desk research and interviews with key players in the community radio movement conducted in October 2022. They highlight how these two stations, while differing in their specific forms of community broadcasting, share a commonality of being independent and offering an alternative to mainstream and public radio programming. Sustainability was identified as a significant challenge facing community radio stations in Hungary, primarily because of unfriendly media policy promoting voices supporting the government. The article also provides characteristics of the community radio concept and the historical context of community radio in Hungary, noting that this country was the first in Central and Eastern Europe to incorporate the third broadcasting sector into media law.
Źródło:
Polish Political Science Yearbook; 2023, 4(52); 59-77
0208-7375
Pojawia się w:
Polish Political Science Yearbook
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of a real radio channel parameters on the quality of the OFDM signal in mobile applications. Estimation of parameters of the channel as an element of improvement of the transmission quality
Autorzy:
Bożek, K.
Powiązania:
https://bibliotekanauki.pl/articles/385028.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
OFDM
radio transmission
multi-path
radio channel estimation
Opis:
The article deals with issues related to transmission of a signal with the OFDM multitude modulation in a real radio channel. Following short characteristics of the OFDM modulation, the article includes an analysis of typical radio channels from the angle of amplitude and phase on the basis of delay profiles referred to in the literature. The study contains results of simulated receipt of the OFDM signal in the multi-path conditions. On the basis of diagrams of constellation of the modulation symbols, the author presented differences in the quality of the signal before and after the phase correction and improvement in the quality due to application of cyclic prefix. Influence of noise as well as the fact that the terminals are non-stationary on operation of the frequency characteristics estimation algorithm was analyzed. At the end, an example was presented of application of a linear model of estimation of phase characteristics of a channel with the shift in frequency occurring in mobile systems as a consequence of the Doppler effect being compensated.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2007, 1, 3; 64-68
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Radio Frequency Interference (RFI) Profile and Determination of Potential Astronomical Radio Sources
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/411988.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Radio Frequency Interference (RFI)
radio astronomy
RFI sources
Opis:
In this article, we have recognized a Radio Frequency Interference (RFI) sources that can potentially affect for radio astronomical observation. The main objective of this surveying is to test and qualify the potential of radio astronomical sources that can be observed in Malaysia generally. Analysis process focuses on the high sources that contribute the pollution and the significant region that can be considered for astronomical purpose beginning 1-2000 MHz. It was found that 13 individual sources contribute as a noise and mostly are telecommunication and radio navigation applications. We then compared of the RFI profiles based on three different periods in order to observe the variety of the signals. The main regions that still excellent to do an observation are: 13.36 -13.41 MHz (solar), (25.55-25.67) MHz (Jupiter) and (37.50-38.25) MHz (Continuum) respectively. This work is also an initiative of the International Space Weather Initiative (ISWI) project where Malaysia is one of the countries that involve in e-CALLISTO (Compound Astronomical Low Cost Low Frequency Transportable Observatory) network project. Some suggestions are recommended in order to improve the quality of the radio frequency profile.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 5; 43-49
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current Situation of Radio Frequency Interference (RFI) Profile at Outdoor and Indoor Sites of Faculty of Applied Sciences, UITM, Malaysia
Autorzy:
Hamidi, Z. S.
Nizamudin, Nur Izzani
Shariff, N. N. M.
Syazwan, M.
Husien, Nurulhazwani
Ali, M. O.
Zainol, N. H.
Ramli, Nabilah
Sabri, S. N. U.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/1191429.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Radio Frequency Interference (RFI)
radio astronomy
RFI sources
Opis:
This Radio Frequency Interference (RFI) study is currently one of a main sub-research in radio astronomy in Malaysia. The main objective of this monitoring is to test and qualify the potential of radio astronomical sources that can be observed in Malaysia generally. Analysis process focuses at indoor and outdoor of Faculty of Applied Sciences, UITM Shah ALAM, Malaysia (latitude: 03°06.534’N, longitude: 101°50.396’E). There are three mobile network communications that operate at the upper band frequency of 1800MHz, which are Maxis (1805-1830 MHz), Celcom (1830-1855 MHz) and Digi (1855-1880 MHz) for GSM/LTE network. We observed that both sites having the highest and second highest peak at the same frequency of 420 MHz and 1835 MHz with the same source, which were due to mobile application followed by the lowest peak due to radio navigation satellite. We verified that the source of RFI of 1835 MHz at the Faculty of Applied Sciences may come from Celcom mobile telecommunication network signal because there is transmitter on top of two Celcom towers. This observation must be continuously done to ensure that RFI level does not increase drastically and to ensure that allocation spectrum band that was reserved for radio astronomy activities was always protected.
Źródło:
World Scientific News; 2016, 40; 23-33
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio k-labelings for Cartesian products of graphs
Autorzy:
Kchikech, Mustapha
Khennoufa, Riadh
Togni, Olivier
Powiązania:
https://bibliotekanauki.pl/articles/743543.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
graph theory
radio channel assignment
radio k-labeling
Cartesian product
radio number
antipodal number
Opis:
Frequency planning consists in allocating frequencies to the transmitters of a cellular network so as to ensure that no pair of transmitters interfere. We study the problem of reducing interference by modeling this by a radio k-labeling problem on graphs: For a graph G and an integer k ≥ 1, a radio k-labeling of G is an assignment f of non negative integers to the vertices of G such that
$|f(x)-f(y)| ≥ k+1-d_G(x,y)$,
for any two vertices x and y, where $d_G(x,y)$ is the distance between x and y in G. The radio k-chromatic number is the minimum of max{f(x)-f(y):x,y ∈ V(G)} over all radio k-labelings f of G. In this paper we present the radio k-labeling for the Cartesian product of two graphs, providing upper bounds on the radio k-chromatic number for this product. These results help to determine upper and lower bounds for radio k-chromatic numbers of hypercubes and grids. In particular, we show that the ratio of upper and lower bounds of the radio number and the radio antipodal number of the square grid is asymptotically [3/2].
Źródło:
Discussiones Mathematicae Graph Theory; 2008, 28, 1; 165-178
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 336

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