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Tytuł:
Video Transmission Using Network Coding
Autorzy:
Asís López-Fuentes de, F.
Cabrera-Medina, C.
Powiązania:
https://bibliotekanauki.pl/articles/308479.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
communication networks
information theory
network coding video streaming
Opis:
Network coding is a new technique in the field of information theory and coding theory. This emerging technique offers great benefits in the communication networks such as increased throughput and energy savings. In this paper, we evaluate network coding for video transmission scenarios. In these scenarios, the source nodes encode the video packets, while the intermediate nodes implement network coding before forwarding the encoded packets to the end nodes. Finally, the end nodes decode the received packets in order to recovery the original video. H.264/MPEG-4 AVC is used as the video compression standard in this work. We have used the network simulator (NS-2) for our simulations. Our results show that network coding improves the system throughput, reduces the packet loss and improves the video quality in the end nodes.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 1; 50-57
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The new data exchange facilities with CAN-FD
Autorzy:
Śmieja, M.
Duda, K.
Mamala, J.
Powiązania:
https://bibliotekanauki.pl/articles/247556.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
automotive
communication networks
CAN
CAN-FD
transmission bandwidth
Opis:
The modern vehicles demand more and more data exchange to coordinate, control and monitor functions of on board system. The variety of networks applied in these systems is featured mainly by the bandwidth and time determinism. The development electronic information and network sciences find its reflection in the new and new automotive implementations. The last significant step towards the increase the throughout put of the on board network channels are works on CAN-FD. CAN is now the most common network present on board. It helps to manage the maintenance with the numerous subassemblies of the modern car. Next to the many features making CAN so useful and popular, there is a bandwidth limitation, which slows down further implementation of it. The new CAN-FD specification adds new properties that extend the possibilities of CAN as automotive network protocol. These are: different speed transmission in the arbitration phase and in the data phase during the message transmission as well as the extending the maximum size of data filed of the frame from 8 (CAN) to 64 (CAN-FD). In the paper there have been presented the limitations of existing CAN protocol usage, the explanation of the basics of the arbitration mechanisms and the response of the scientist and engineers to cope with it, as well as the formal result outlined in the CAN-FD specification.
Źródło:
Journal of KONES; 2016, 23, 4; 527-533
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The conception of modular monitor of car exploitation parameters
Autorzy:
Śmieja, M.
Ziejewski, K.
Wierzbicki, S.
Mamala, J.
Powiązania:
https://bibliotekanauki.pl/articles/247378.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
automotive
communication networks
car parameter monitoring
CAN
modular system
Opis:
Current tendencies in electronics and informatics development going towards Internet of Things (IoT), Big Data or Data Cloud technologies create new possibilities in acquiring and utilizing data. The article presents the concept of modular monitoring of vehicles operating parameters. Presented device registers data from the OBD system and a set of independent, configurable sensor modules. Data from the OBD system is acquired via protocol. CAN Bus with a DLC connector. The signal from sensor modules is transferred via a Bluetooth wireless network. The registered data can be storage on board as CD card memory or alternatively on a typical user interface such as laptop, tablet, cell phone etc. The communication with the user interface is realised with USB. Moving vehicles modular monitoring system presented in the article can be used to attain a fuller representation of the vehicles state in relation to its environment. The base assumption of the device is maximal flexibility in term of sensors versality as well as possibilities of assembly on board. In connection with the concept, a prototype of the device was made and tested with an inertial measurement unit (IMU) module and a pressure sensor. Appliances modules are based on Cortex M4 and M0 processing units. A users interface in LabVIEW and examples of registered signals are showed at the end of the article.
Źródło:
Journal of KONES; 2017, 24, 4; 321-326
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LoRaWAN networks in automotive applications
Autorzy:
Śmieja, M.
Duda, K.
Mamala, J.
Powiązania:
https://bibliotekanauki.pl/articles/243751.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
automotive
communication networks
car parameter monitoring
CAN
modular system
Opis:
Development of IoT is tightly coupled with the use of the wireless communication solutions. Nowadays there are several standard wireless protocols, which are responsible for carrying information. The increase of the communication traffic tends to specialize the kind of used data interchange methods for the sake of demanded size of data packet, frequency of connections, meaning of the data, security and safety of the transmission as well as many others. One of the intensively spreading wireless networks is LoRaWAN. Because of its low energy consumption, long distance range, and high flexibility, it seems to be very effective solution to apply in the field of road traffic. The article presented the base features of LoRaWAN as well as the conception of virtual local traffic system based on the data yield from the board systems of cars. Accessed from OBD information about f. e.g. temporary cars speed or accelerations associated with their current position can be significant factor in creating the real image of the traffic situation.
Źródło:
Journal of KONES; 2018, 25, 3; 431-435
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing Gausian and exact models of malicious interference in VLC systems
Autorzy:
Blinowski, Grzegorz
Mościcki, Adam
Powiązania:
https://bibliotekanauki.pl/articles/225996.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
visible light communication networks
network security
physical layer security
transmission jamming
Opis:
Visible Light Communication (VLC) is a technique for high-speed, low-cost wireless data transmission based on LED luminaries. Wireless LAN environments are a major application of VLC. In these environments, VLC is used in place of traditional systems such as Wi-Fi. Because of the physical characteristics of visible light, VLC is considered to be superior to traditional radio-based communication in terms of security. However, as in all wireless systems, the security of VLC with respect to eavesdropping, signal jamming and modification must be analyzed. This paper focuses on the aspect of jamming in VLC networks. In environments where multiple VLC transmitters are used, there is the possibility that one or more transmitters will be hostile (or "rogue"). This leads to communication disruption, and in some cases, the hijacking of the legitimate data stream. In this paper we present the theoretical system model that is used in simulations to evaluate various rogue transmission scenarios in a typical indoor enviro.The typical approach used so far in jamming analysis assumes that all disruptive transmissions may be modeled as Gaussian noise, but this assumption may be too simplistic. We analyze and compare two models of VLC jamming: the simplified Gaussian and the exact model, where the full characteristics of the interfering signal are taken into account. Our aim is to determine which methodology is adequate for studying signal jamming in VLC systems.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 277-286
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The new, parameterised VT model for determining quality in the video-telephony service
Autorzy:
Uhl, T.
Paulsen, S.
Powiązania:
https://bibliotekanauki.pl/articles/202353.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
communication networks
communication services
IP transport platform
QoS measurement techniques
VToIP
G.1070
PEVQ
Opis:
This paper describes a new method for measuring and appraising the quality of the video stream in the video-telephony service in IP environments (VToIP). The method uses the so-called VS Model and belongs to the group of parameter-based measurement techniques (offline operation, i.e. without active measurement). It delivers results that come extremely close to those contained in the corresponding Perceptual Evaluation of Video Quality (PEVQ) curves. The method is quick and easy to use - a convincing argument for using this new QoS measuring method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 431-437
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Referential graphs
Grafy referencyjne
Autorzy:
Ledziński, D.
Marciniak, B.
Śrutek, M.
Powiązania:
https://bibliotekanauki.pl/articles/389824.pdf
Data publikacji:
2013
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
graphs
chordal rings
data communication networks
grafy
grafy referencyjne
projektowanie sieci telekomunikacyjnych
Opis:
The authors of this paper have defined the notion of referential graphs which allow to model data and telecommunication networks in order to optimize them. Parameters of this type of graphs can be compared with parameters of modified chordal rings three and four degree. A description of the program developed for graphs of this type and its effects have been presented.
W artykule zdefiniowano pojęcie Grafu Referencyjnego, za pomocą którego można modelować sieci teleinformatyczne w celu ich optymalizacji. Zdefiniowano parametry takiego typu grafów, które zostały porównane z parametrami modyfikowanych pierścieni cięciwowych trzeciego i czwartego stopnia. Do modelowania poszczególnych przypadków opracowano program symulacyjny. Zaprezentowano opis tego programu oraz wyniki otrzymane przy wyszukiwaniu grafów referencyjnych dla szerokiego spektrum danych wejściowych.
Źródło:
Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy; 2013, 17; 37-73
1899-0088
Pojawia się w:
Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of mutual position of communication network users on accuracy of positioning by telemetry method
Autorzy:
Džunda, M.
Dzurovčin, P.
Powiązania:
https://bibliotekanauki.pl/articles/1841445.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
e-Navigation
mutual position
telemetry method
Matlab
accuracy of position
communication networks
Opis:
In this paper we solve the problem of the influence of the mutual position of the users of the communication network on the accuracy of the telemetric navigation system. We present the principle of operation of a telemetry navigation system and examine the accuracy of determining the position of users of the communication network depending on their mutual position. The telemetric method of determining the position of users of a communication network can be used in shipping or air transport. The simulation of the telemetry system will be performed in the Matlab software environment.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 2; 299-306
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The new, parametrised IPTV Model for Determining the Quality in the IPTV Service
Autorzy:
Uhl, T.
Jürgensen, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/201479.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
communication networks
communication services
IP transport platform
QoS measurement techniques
sieci komunikacyjne
usługi komunikacyjne
platforma transportowa IP
techniki pomiarowe QoS
Opis:
This paper describes a new measurement method for determining the quality of the IPTV (Television over IP) service. This method uses the latest IPTV Model and is one of a number of parameter-based measuring techniques (offline operation, i.e. without intrusive measurement). It delivers results that come very close to those of the corresponding Perceptual Evaluation of Video Quality (PEVQ) curves. The method is quickly and easily implemented - one of the great advantages of using this method to measure QoS.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 495-500
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcja sterowania i zarządzania ruchem drogowym w systemie PRT
The concept of the PRT traffic control and management system
Autorzy:
Luft, Mirosław
Pietruszczak, Daniel
Chojnacki, Michał
Powiązania:
https://bibliotekanauki.pl/articles/316384.pdf
Data publikacji:
2019
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
indywidualizowany transport miejski (PRT)
sieć PRT
sieci komunikacyjne
transport miejski
Personal Rapid Transit (PRT)
urban transport
PRT control system
communication networks
Opis:
W artykule przedstawiono analizę informatycznego systemu sterowania i zarządzania ruchem PRT (ang. Personal Rapid Transit). Zdefiniowano pojęcie systemu PRT, przeprowadzono przegląd tych systemów oraz ich struktury. Dokonano genezy zastosowania systemów informatycznych sterowania i zarządzania ruchem PRT. Opisano układy mechaniczne i ergonomiczne dedykowanych pojazdów. Scharakteryzowano strukturę układu jezdnego oraz ergonomię kabin pojazdu PRT. Opisano proces szacowania warunków ruchu oraz dokonano symulacji przykładowych pojazdów. Dokonano analizę systemu PRT, którego celem jest określenie optymalnej liczby stacji PRT gwarantujących optymalne zapewnienie usługi, pod względem natężenia popytu na usługi PRT. Zilustrowano etapy projektowania systemu cyrkulacji PRT dla dzielnic na obrzeżach miasta. Posłużono się narzędziem informatycznym programu OPTIMAL (C-CAD).
The paper presented the PRT (Personal Rapid Transit) control and traffic management system. The genesis of the use of information systems for control and PRT traffic management was made. The concept of the PRT system was defined, a review of these systems and their structure was carried out. The mechanical and ergonomic systems of PRT vehicles have been described. The chassis structure and the ergonomics of the PRT vehicle cabs have been characterized. The process of estimating traffic conditions and simulations of exemplary PRT vehicles have been described. An analysis of the PRT system was carried out, the purpose of which is to determine the optimal number of PRT stations guaranteeing optimal service provision, in terms of the demand for PRT services. The stages of designing the PRT circulation system for districts on the outskirts of the city are illustrated. The OPTIMAL program tool (C-CAD) has been used.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2019, 20, 6; 400-413
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consideration of a general model of stochastic service curve for communication networks
Autorzy:
Wasielewska, K.
Borys, A.
Powiązania:
https://bibliotekanauki.pl/articles/117055.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
communication networks
stochastic service
communication system
maritime telecommunications area
Quality of Service (QoS)
stochastic network calculus
modelling of model of stochastic service curve
stochastic service curve
Opis:
In this paper, a general framework for modelling stochastic service curves for communication networks is presented. It connects with each other two approaches to the traffic analysis and performance evaluation of communication systems, namely, the one which is called a deterministic network calculus with its stochastic counterpart. Thereby, it enables to treat any communication traffic in a consistent way. Further, as we show here, it enables also achieving new results. Derivation of the above model is presented in details in this paper. Finally, some hints are given how the method presented in this article could be applied in maritime telecommunications area.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 159-164
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Communicating a Company’s CSR Activities Through Social Networks: A Theoretical Framework
Autorzy:
Grzesiuk, Kalina
Powiązania:
https://bibliotekanauki.pl/articles/653235.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
CSR
communication strategies
social networks
Opis:
Companies which decide on socially responsible activities usually take into consideration benefits including the marketing effects of CSR programmes. However, in order to achieve that, the information about the socially responsible activities of companies must be spread and reach the audience of the company. That includes stakeholders related to the company that might be interested in receiving information about the social initiatives undertaken by the company. These stakeholders are connected with the firm through the network of social ties (SN). The main goal of this article is to present a theoretical framework of roles that these networks of social ties play in the effective communication of CSR activities. This paper is divided into three parts. The first one concerns the problem of how to communicate the involvement of a company in social initiatives. The second one contains the description of possible communication processes and strategies. The last one presents the analysis of the social networks perspective and its main characteristics and, in conclusion, it summarizes the main benefits a company can gain by applying the SN concept to CSR communication in the area of attribution and information spread through various channels.
Źródło:
Annales. Etyka w Życiu Gospodarczym; 2017, 20, 4
1899-2226
2353-4869
Pojawia się w:
Annales. Etyka w Życiu Gospodarczym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems in communication between businesses and technical education system
Autorzy:
Szafrański, M.
Bogurska-Matys, K.
Goliński, M.
Powiązania:
https://bibliotekanauki.pl/articles/407225.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
management of knowledge
knowledge networks
enterprise networks
communication model
Opis:
This paper presents how some communication problems between business and Technical Education System (TES) can be reduced. This comes to a misunderstanding of the needs of entrepreneurs for the knowledge and skills, in this paper treated as a resource on the market. The authors explain why debated issue falls in the area of corporate management. It identifies one of the reasons hindering the solution of problems. In order to clarify the issues it references the achievements of analytic philosophy of language and the theory of communication code. It proposed a method of facilitating the solution of the problem, which is being implemented since 2016 by the research team, co-created by the authors of this publication. The aim of the development of this publication is to supplement the theoretical and practical knowledge of management in manufacturing companies and others with high technical potential, where there is a large, growing and rapidly changing demand for knowledge and technical skills.
Źródło:
Management and Production Engineering Review; 2017, 8, 2; 9-18
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Facebook a polityka. Wykorzystanie serwisów społecznościowych przez polskie partie polityczne
Facebook and politics. The use of social networks by Polish political parties
Autorzy:
Porębski, Leszek
Karasek-Kędzior, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/1953248.pdf
Data publikacji:
2015-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
political parties
social networks
political communication
Opis:
The paper presents results of the research project that explored the mode in which Polish political parties use their Facebook profiles. The findings of the analysis prove that interactive and multimedia aspect of social networking is employed only in a limited degree. Party profiles are not used as a platform of the information on party activity distribution. Even basic contact data is not available on each of analyzed profiles. Moreover, as was expected, there is no clear association between the technical sophistication of the specific party profile and the position of the party on political market. Parties which are leaders of the ICT (Information and Communication Technologies) use are not dominating in terms of both possessed resources and the role played in parliamentary politics.
Źródło:
Athenaeum. Polskie Studia Politologiczne; 2015, 45; 176-190
1505-2192
Pojawia się w:
Athenaeum. Polskie Studia Politologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coordination Games with Communication Costs in Network Environments
Autorzy:
Nishizaki, I.
Hayashida, T.
Hara, N.
Powiązania:
https://bibliotekanauki.pl/articles/309301.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
communication costs
coordination games
equilibrium
networks
Opis:
In this paper, we deal with a coordination game in a network where a player can choose both an action of the game and partners for playing the game. In particular, a player interacts with players connecting through a path consisting of multiple links as well as with players directly connecting by a single link. We represent decay or friction of payoffs with distance as communication costs, and examine the effect of the communication cost on behavior of players in the game and network formation. We investigate properties of equilibrium networks by classifying the link cost and the communication cost, and show diversity of the equilibrium networks.
Źródło:
Journal of Telecommunications and Information Technology; 2010, 2; 88-98
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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