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Wyszukujesz frazę "communication" wg kryterium: Wszystkie pola


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
Tytuł:
Inclusion of sign language users via information and communication technology
Autorzy:
Dotter, F.
Hilzensauer, M.
Powiązania:
https://bibliotekanauki.pl/articles/309441.pdf
Data publikacji:
2006
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
integration
inclusion
deaf
hearing-impaired
communication society
Opis:
The paper addresses the situation of sign language users (mostly deaf people) in the context of inclusion as a political goal. For several reasons, there is often still some confusion with the terms of deaf and hearing impaired. In order to overcome this confusion, a survey is given over the needs of people who have a sign language as their preferred language as well as the needs of people who decide on preferring spoken language (mostly hard-of-hearing people). One should also doubt that the whole target group of people with disabilities in the hearing area consists of two separate groups only. Starting from the right of self-determination, the better solution seems to be the individual right of a person to choose any offers which are useful for her/him. As for other groups of people with special needs, ICT is seen as a big chance for improving their situation in terms of life and job chances. Several projects and experiences are reported.
Źródło:
Journal of Telecommunications and Information Technology; 2006, 2; 41-51
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality Expectations of Mobile Subscribers
Autorzy:
Gilski, P.
Stefański, J.
Powiązania:
https://bibliotekanauki.pl/articles/307922.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cellular networks
mobile communication
quality of experience
quality of service
wireless communication
Opis:
Mobile systems, by nature, have finite resources. Radio spectrum is limited, expensive and shared between many users and services. Mobile broadband networks must support multiple applications of voice, video and data on a single IP-based infrastructure. These converged services each have unique traffic holding and quality requirements. A positive user experience must be obtained through efficient partitioning of the available wireless network resources. The 3rd Generation Partnership Project (3GPP) has developed a comprehensive Quality of Service (QoS) parameter to address this problem. The regular control of service quality is critical for operators to ensure user Quality of Experience (QoE), establish new business models and monetize services. It enables operators to employ fair-use resource policies and maintain network performance during peak traffic times. Wireless mobile communication is tending towards an integrated system of Internet and telecommunication technologies, where mobile users move freely anytime and everywhere. They desire to communicate with any device using the best service available. In this paper QoS management issues in mobile communication are described. The authors present an insight into subscriber behavior and related factors that affect the QoE of mobile data services.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 1; 15-19
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subscriber location in radio communication nets
Autorzy:
Gajewski, P.
Kelner, J. M.
Ziółkowski, C.
Powiązania:
https://bibliotekanauki.pl/articles/308083.pdf
Data publikacji:
2008
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
mobile radio communication
Doppler effect
location of radio waves sources
Opis:
Our aim is to develop the method of location subscriber to be used in military communication nets. This method is based on frequency offset measurement. Analytic description of the Doppler effect creates one of such possibilities. In this paper, an original location subscriber method is presented. We showed the Maxwell equations solution in the case of a transmitter continually changing location in relation to a receiver. It makes possible to calculate exactly the value of the received signal parameters especially frequency offset. The methodology described in this paper shows that the Doppler frequency offset value can be used for radio signal sources location.
Źródło:
Journal of Telecommunications and Information Technology; 2008, 2; 88-92
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated analysis of communication protocols by means of PLA formalism
Autorzy:
Pranevicius, H.
Powiązania:
https://bibliotekanauki.pl/articles/308344.pdf
Data publikacji:
2004
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
piece-linear aggregates
ESTELLE/Ag specification language
validation
simulation
communication protocols
Opis:
Aggregate approach and its possibilities for specification and analysis of computer network protocols are presented. The theoretical basis of the aggregate approach is a piece-linear aggregate (PLA) for formal specification of systems. The advantage of that approach is that it permits to create models both for analysis correctness of specifications and simulation. Some methods that can be used for validation and verification of aggregate specifications are presented also.
Źródło:
Journal of Telecommunications and Information Technology; 2004, 4; 84-90
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multimedia Mathematical Communication in a Diverse Group of Students
Autorzy:
Brzostek-Pawłowska, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/307926.pdf
Data publikacji:
2019
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
efficiency of communication
learning mathematics
mathematical formula notations
semantic readout of formulas
Opis:
The article tackles the problem of improving mathematical communication in a group of students with different visual impairment levels, under the guidance of a group leader or a teacher. Visually impaired persons face a problem while learning mathematics. The said problem results from the specific nature in which mathematical content (formulas, function graphs, geometrical figures and projections of solids) is recorded and presented. The effectiveness of learning mathematics is boosted when students work in a group moderated by a leader. This requires them to share documents, with the leader being able to keep track of the individual work of each participant, and with the group discussing specific solutions. In order for a visually impaired student to be able to participate in and contribute to the work of the group, either remotely or locally, all participants must use universal IT tools that support visually impaired students without complicating the work of others. This paper presents interactive multimedia solutions developed under two research projects carried out by the author. The said solutions support communication in mathematics. Results of qualitative surveys on new solutions are presented, confirming their usefulness and the measurable impact they exert on the efficiency of the group’s work concerning mathematical problems.
Źródło:
Journal of Telecommunications and Information Technology; 2019, 2; 92-103
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linux Scheduler Improvement for Time Demanding Network Applications, Running on Communication Platform Systems
Autorzy:
Hasse, M.
Nowicki, K.
Powiązania:
https://bibliotekanauki.pl/articles/308906.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
communication platform systems
Linux
operating system
scheduler
Opis:
Communication platform systems as, e.g., advanced telecommunication computing architecture (ATCA) standard blades located in standardized chassis, provides high level communication services between system peripherals. Each ATCA blade brings dedicated functionality to the system but can as well exist as separated host responsible for servicing set of task. According to platform philosophy these parts of system can be quite independent against another solutions provided by competitors. Each system design can be different and can face with many computer systems design problems. One of the most difficult design problems to solve is system integration with a set of components running on different operating system levels. This paper presents Linux scheduler improvement possibility to make user space application classified as time demanding (required to be serviced by CPU in given amount of time) running in user space together with complicated kernel software structure in the system.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 2; 63-69
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ILP modeling of many-to-many replicated multimedia communication
Autorzy:
Walkowiak, K.
Bulira, D.
Careglio, D.
Powiązania:
https://bibliotekanauki.pl/articles/308697.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
ILP modeling
many-to-many communication
network optimization
replica location
Opis:
On-line communication services were evolving from a simple text-based chats towards sophisticated videopresence appliances. The bandwidth consumption of those services is constantly growing due to the technology development and high user and business needs. That fact leads us to implement optimization mechanisms into the multimedia communication scenarios. In this paper, the authors concentrate on many-to-many (m2m) communication, that is mainly driven by the growing popularity of on-line conferences and telepresence applications. An overlay model where m2m flows are optimally established on top of a given set of network routes is formulated and a joint model where the network routes and the m2m flows are jointly optimized. In the models, the traffic traverses through replica servers, that are responsible for stream aggregation and compression. Models for both predefined replica locations and optimized server settlement are presented. Each model is being followed by a comprehensive description and is based on real teleconference systems.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 3; 56-65
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A way of integrating deaf, hearing- and speech-impaired people into modern communication society
Autorzy:
Hilzensauer, M.
Powiązania:
https://bibliotekanauki.pl/articles/309445.pdf
Data publikacji:
2006
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
telecommunications
communication society
integration
inclusion
deaf
hearing-impaired
speech-impaired
Opis:
This article deals with the exclusion of deaf, hearing- and speech-impaired people from our modern communication society, as they are unable to use the phone. This situation leads to discrimination and disadvantages in their everyday lives. One solution to this problem is the implementation of so-called relay centers which act as go-betweens; with the aid of communications assistants and interpreters, a direct conversation with a hearing person becomes possible. The Center for Sign Language and Deaf Communication has developed a concept of such a relay center for Austria. The main innovations are the integrative technological approach (trying to integrate all possible communication devices) and the embedding into an Internet portal, including additional services for the target groups. An overview of the activities carried out during the 6-month preparatory project is given, and the results are described.
Źródło:
Journal of Telecommunications and Information Technology; 2006, 2; 32-40
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the Geometry of an Underwater Channel for Acoustic Communication
Autorzy:
Naman, Hala A.
Abdelkareem, A. E.
Powiązania:
https://bibliotekanauki.pl/articles/2174453.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
channel impulse response
geometry channel model
multipath propagation
underwater acoustic communication
Opis:
The achievement of efficient data transmissions via underwater acoustic channels, while dealing with large data packets and real-time data fed by underwater sensors, requires a high data rate. However, diffraction, refraction, and reflection phenomena, as well as phase and amplitude variations, are common problems experienced in underwater acoustic (UWA) channels. These factors make it difficult to achieve high-speed and long-range underwater acoustic communications. Due to multipath interference caused by surface and ocean floor reflections, the process of modeling acoustic channels under the water’s surface is of key importance. This work proposes a simple geometry-based channel model for underwater communication. The impact that varying numbers of reflections, low water depth values, and distances between the transmitter and the receiver exert on channel impulse response and transmission loss is examined. The high degree of similarity between numerical simulations and actual results demonstrates that the proposed model is suitable for describing shallow underwater acoustic communication environments.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 4; 3--12
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Historical Perspectives of Development of Antique Analog Telephone Systems
Autorzy:
Patil, V. L.
Powiązania:
https://bibliotekanauki.pl/articles/308813.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
antique telephones
common battery systems
cross-bar switches
PSTN
voice band communication
voice communication
strowger switches
Opis:
Long distance voice communication has been always of great interest to human beings. His untiring efforts and intuition from many years together was responsible for making it to happen to a such advanced stage today. This paper describes the development time line of antique telephone systems, which starts from the year 1854 and begins with the very early effort of Antonio Meucci and Alexander Graham Bell and ends up to the telephone systems just before digitization of entire telecommunication systems. The progress of development of entire antique telephone systems is highlighted in this paper. The coverage is limited to only analog voice communication in a narrow band related to human voice.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 3; 70-98
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality Aspects in Digital Broadcasting and Webcasting Systems: Bitrate versus Loudness
Autorzy:
Gilski, P.
Gajewski, S.
Stefański, J.
Powiązania:
https://bibliotekanauki.pl/articles/308210.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
broadcast technology
mobile communication
quality of experience
quality of service
webcast technology
wireless communication
Opis:
In this paper the quality aspects of bitrate and loudness in digital broadcasting and webcasting systems are examined. The authors discuss a survey concerning user preferences related with processing and managing audio content. The coding efficiency of a popular audio format is analyzed in the context of storing media. An objective study on a representative group of signal samples, as well as a subjective study of the perceived quality of real-time broadcasted and webcasted radio programs are performed.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 2; 26-31
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of open multi-commodity market data model on the communication bandwidth market
Autorzy:
Kasprzak, P.
Kaleta, M.
Pałka, P.
Smoliła, K.
Toczyłowski, E.
Traczyk, T.
Powiązania:
https://bibliotekanauki.pl/articles/308563.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
communication bandwidth trade
market clearing
multi-commodity trade
Opis:
In the paper the market model for balancing communication bandwidth trade (BCBT) is analyzed in the form of multi-commodity market data model (M3). The distinguishing feature of BCBT model is that it assumes that market players can place buy offers not only for isolated network resources - inter-node links, but also for end-to-end network paths of predefined capacity, that is, every offer concerns a point-to-point bandwidth connection between a pair of specified locations in a communication network. The model enables effective balancing of sell and buy offers for network resources in a way which maximizes global economic welfare. The open multi-commodity market data model provides efficient and clear mechanisms, which support the environment of auctions and multi-commodity exchanges, especially when the trade is constrained by the infrastructure resources. Thus the model may be used in designing open information systems for market balancing and clearing in the context of multicommodity trade in various network infrastructure sectors.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 4; 45-50
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Development of a UDP-Based Connection-Oriented Multi-Stream One-to-Many Communication Protocol
Autorzy:
Stanciu, V.
Andreica, M. I.
Olaru, V.
Tăpuş, N.
Powiązania:
https://bibliotekanauki.pl/articles/308499.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
communication protocol
connection oriented
multiple streams
one-to-many
Opis:
A communication protocol is a set of rules defined formally that describes the format of digital messages and the rules for exchanging those messages in or between computing systems. The Internet Protocol Suite used for communications throughout the Internet uses encapsulation to provide a way of abstracting protocols and services. This abstraction is grouped into layers of general functionality. For protocols on the transmission layer, many choices exist. But while popular protocols such as TCP, UDP and SCTP do provide connection oriented communication offering reliability, ordering and data integrity, solutions that offer such connections from one point to multiple endpoints are still limited. TCP only supports point-to-point communication and SCTP offers multi-homing functionality, but the transmission is still limited to two logical endpoints. In this paper we use the simple, stateless, transmission model of UDP in order to provide TCP-like services for one-to-many communication that is not limited to just multi-homing or other particular solutions. The protocol supports reliable communication from one endpoint to multiple endpoints in different transmission modes. In order to make it easier for developers to customize the protocol to their needs and possibly extend/modify it in order to create new variants from it, the protocol is developed in user space. Because of this design restriction performance wasn't the main objective of our work, but rather the ease of customization and experimentation with new protocol variants. The protocol was implemented in the C++ programming language using classes with virtual members. New variants of components, such as packet retransmission, can easily be implemented without changing the whole code base.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 1; 3-15
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interference Management using Power Control for Device-to-Device Communication in Future Cellular Network
Autorzy:
Nugraha, T. A.
Pamungkas, M. P.
Chamim, A. N. N.
Powiązania:
https://bibliotekanauki.pl/articles/958069.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cellular network
device-to-device communication
interference management
power control
Opis:
There are many scenarios that have been proposed for fifth generation (5G) networks. Some of them, if implemented, will bring fundamental changes at the architectural and node level. One example of such proposed technologies is device-to-device (D2D) communications which will change the nature of conventional cellular network design. D2D permits direct communication between two or more user devices without intervention of the base station (i.e. eNB). D2D can ensure network performance improvement over the traditional cellular network, because it can offload the mobile data traffic from the other devices. However, applying D2D features in a cellular network will bring about more complex interference problems, since D2D communication uses the same band as its underlying cellular communication network. The aim of this research is to investigate interference-related problems caused by D2D communications, affecting the underlying cellular networks, during downlink and uplink transmissions. The paper examines the use of power control methods to mitigate interference. A comparison is offered between fixed power level (FC) with or without power control, and adaptive power controls using two methods (AC1 and AC2), on a base station or on each of the D2D devices, based on the measured signal to interference plus noise ratio (SINR). The simulation results show that both power control methods contribute to improvement of network performance. AC1 and AC2 can improve SINR by about 1 dB and 0.5 dB compared to FC in a downlink transmission, and by 0.5 dB in an uplink transmission.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 3; 31-36
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł

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