Temat: communication systems - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A method to build network-of-queues-based simulators for communication systems
Autorzy:: Pasini, L.
Feliziani, S.
Powiązania:: https://bibliotekanauki.pl/articles/1954090.pdf
Data publikacji:: 2004
Wydawca:: Politechnika Gdańska
Tematy:: queuing systems
computer simulation
communication systems
Opis:: In this study we build a library of new object types whose architecture is based on models of networks-of-queues to simulate communication networks. We also define a class of procedures to automatically generate a simulator of a generic communication network described by the library's objects.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 3; 333-358
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Maritime radio information systems
Autorzy:: Korcz, K.
Powiązania:: https://bibliotekanauki.pl/articles/246746.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: communication systems
maritime safety communication
ships' operating communication
Opis:: The article presents and evaluates the technical and operational possibilities of the maritime radio communications systems to be used especially for the exchange of information between the land users and ships. The basic functional requirements and regulations for Global Maritime Distress and Safety System (GMDSS) referring to the maritime radio information systems, resulting from the provisions of the International Convention for the Safety of Life at Sea (SOLAS) and Radio Regulations have been described. The article presents the role of information systems in the shipping and GMDSS as well. A current status of the maritime radio communication systems responsible for the exchange of information between the land users and ships has been presented. Operational and technical characteristics of the maritime radio systems used for the exchange of safety information and ships’ operating information have been described. The analysis of the systems responsible for broadcasting to the vessels the Maritime Safety Information (MSI) has been made. In this context, the operation, methods and ranges of broadcast of the Maritime Safety Information by the NAVTEX system and Inmarsat SafetyNet system have been discussed. The analysis of the systems responsible for the ships’ operating communications has been made too. The article also outlines the future of maritime radio information systems. In this context, two projects currently being implemented in the framework of the International Maritime Organization (IMO) by the Sub-Committee on Navigation, Communications, Search, and Rescue (NCSR) have been presented. The first of these projects under the name of e-Navigation refers to the use of the latest information and communication technologies in shipping. The second one concerns the modernization of the GMDSS. It is expected that as the outcome of these project works, among others, new maritime radio information systems presented here will be adopted.
Źródło:: Journal of KONES; 2017, 24, 3; 127-134
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Communication systems for safety and security of ships
Autorzy:: Korcz, K.
Powiązania:: https://bibliotekanauki.pl/articles/245291.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: communication systems
maritime safety
maritime security
Opis:: The article assesses the technical and operational possibilities of the marine communications systems to ensure the safety and security of ships. The basic functional requirements for marine radio communication to ensure the safety and security of ships, resulting from the provisions of the International Convention for the Safety of Life at Sea (SOLAS), have been described. The article presents the marine radio communication systems responsible for the distress alerting. The operation and ways of alerting used in Inmarsat satellite systems, Cospas-Sarsat systems and Digital Selective Calling system (DSC) have been described. The analysis of the systems responsible for broadcasting to the vessels the Maritime Safety Information (MSI) has been made. In this context, the operation, methods and ranges of broadcast of the Maritime Safety Information by the NAVTEX system and Inmarsat SafetyNet system have been described. The systems performing the function of ships security have also been discussed. The operation, application and basic properties of the Ship Security Alert System (SSAS) and Long Range Identification and Tracking system (LRIT) have been presented. In the subsequent part, the article outlines the future of maritime communications systems used to ensure the safety and security of ships. In this context, two projects currently being implemented in the framework of the International Maritime Organization (IMO) by the Sub-Committee on Navigation, Communications, Search, and Rescue (NCSR) have been presented. The first of these projects under the name of e-navigation refers to the use of the latest information and communication technologies in shipping. The second one concerns the modernization of the Global Maritime Distress and Safety System (GMDSS).
Źródło:: Journal of KONES; 2016, 23, 1; 153-160
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Adaptive telecommunications modems techniques for use in underwater communication systems
Autorzy:: Budzińska, I.
Lasota, H.
Mazurek, R.
Powiązania:: https://bibliotekanauki.pl/articles/331551.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: hydroacoustics
underwater communication systems
data transmission
Opis:: Underwater channel data transmission is one of telecommunications most difficult problems. One way to optimise the transmission may be by adapting transmission techniques used in telecommunications modems. The articles presents two ITU-T standards: V.34 and G.992.1, known as ADSL. The possibilities and limitations of these techniques for underwater communication systems are discussed. The ADSI standard using the DMT modulation seems to be the best.
Źródło:: Hydroacoustics; 2003, 6; 285-292
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Laboratory equipment to optimise integrated communication systems for military helicopters
Autorzy:: Pazur, A.
Rogala, K.
Paszek, S.
Powiązania:: https://bibliotekanauki.pl/articles/242307.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: integrated communication systems
research-testing station
software
Opis:: What has been presented in the paper is a research/testing tool used in the Air F orce Institute of Technology (Instytut Techniczny Wojsk Lotniczych - ITWL) to build, actuate, test, and optimise integrated communication systems as far as both a set of devices the system is composed of and the applied software are concerned. Particular attention has been paid to the so-called integration station (built under the Mi-8, Mi-17, Mi-24 upgrade project), i.e. the laboratory equipment to optimise and unify communication systems integrated on the basis of digital data buses (following the MIL-1553B standard, among other ones). Such equipment has allowed ITWL to integrate new communication devices/systems while upgrading the W-3PL helicopter. Some selected tasks performed with this equipment engagedhave been discussed. Also, problems arising while actuating and testing the developed software to integrate communication devices/systems (including digitally controlled radio stations of the RRC, HARRIS, and MR6000 types, communication control panels of the PSL-1 type and multi-function displays of the MW-l type) have been given consideration in the scope of the software functionality and reliability. Presented are also additional monitoring and measuring systems used to test this software, just to mention the M230 rugged laptop computer used to diagnose the system and prepare plans of the radio communication.
Źródło:: Journal of KONES; 2009, 16, 2; 375-382
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Information and communication technologies (ICT) in construction and development of logistics systems
Technologie informacyjno-komunikacyjne (ICT) w budowie i rozwoju systemów logistycznych
Autorzy:: Jezierski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2053050.pdf
Data publikacji:: 2020
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:: logistics
information and communication systems
logistics systems
technological solutions
Opis:: The higher and higher level of competitiveness of enterprises, the in- creasing expectations of customers or internalization of business are just a few examples of challenges that most of companies must face nowadays. None of these challenges may be faced, however, if the companies do not cope with logistics pro- blems. The increasing number of problems, among others related to the necessity of diversification of products, of provision of frequent, fast and small deliveries, of ensuring reliability and flexibility in operation, of transfer of goods almost all over the world, can no longer be solved with application of traditional methods. Con- dition of success in contemporary logistics is implementation of modern techno- logy. Companies without IT systems, without automatic identification of goods or electronic exchange of data have not chances for strong presence in today’s supply chains or other modern forms of business. In this paper characteristics of selected information and communication technologies (ICT) were presented with reference to the operation of contemporary logistics systems. The introduction presents the role and substance of the information resources in logistics. Technological solu- tions concerning transfer of information were grouped and characterized according to the following types: family of electronic connections, corporate networks and information highways. In each group of the solutions main faults and benefits were presented, from the perspective of possibilities of application in logistic.
Źródło:: Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Ekonomika i Organizacja Logistyki; 2020, 5[1]; 5-13
2450-8055
Pojawia się w:: Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Ekonomika i Organizacja Logistyki
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Influence of Drift on Efficiency of Optimal Analog Adaptive Communication Systems with Feedback and Its Compensation
Autorzy:: Jędrzejewski, K.
Powiązania:: https://bibliotekanauki.pl/articles/227312.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: communication systems
feedback
drift compensation
optimal adaptive estimation
Opis:: Results of analysis of drift influence on operation and efficiency of optimal analog adaptive communication systems with feedback and a new approach to drift compensation in these systems are presented in the paper. The proposed approach is based on application of the extended multidimensional adaptive algorithm that estimates simultaneously the value of a transmitted sample and the value of an unknown drift rate. The knowledge of the drift rate enables drift compensation and improves transmission efficiency of systems suffering problems related to drifts.
Źródło:: International Journal of Electronics and Telecommunications; 2013, 59, 1; 51-58
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A comparison of different modulation techniques performances in an underground multiuser communications scenario
Autorzy:: Badescu, A.-M.
Powiązania:: https://bibliotekanauki.pl/articles/106166.pdf
Data publikacji:: 2012
Wydawca:: Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:: modulation techniques
commercial communication systems
CDMA
16-QAM
QPSK
Opis:: The potential use of typical commercial communication systems with ultra high frequencies for the underground emergency/military situations will be investigated, as commercial systems have already a fully developed market that makes them cheap and reliable. The possible usage of broadband techniques like CDMA in the direct sequence will be studied because most commercial communication systems have already been designed to support multiple users, as the underground propagation has many possible applications. The performances of both modulation techniques are evaluated from the point of view of the quality of the signals, power spectral density and the effect that the propagation medium has on the transmitted signals such that the best modulation technique is determined. The 16QAM and QPSK modulations (two of the most popular modulation techniques in the terrestrial wireless system) are compared in a scenario where a number of underground sources share the same physical channel (and antenna) - the receiver is placed at the ground level so the generated signals must propagate through the dielectric layer in order to reach it. The transmitted power, electric and magnetic fields as well as occupied bandwidth are also calculated.
Źródło:: Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2012, 12, 2; 73-85
1732-1360
2083-3628
Pojawia się w:: Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Construction of queue-based simulators for web applications distributed on computer networks
Autorzy:: Pasini, L.
Feliziani, S.
Powiązania:: https://bibliotekanauki.pl/articles/1964158.pdf
Data publikacji:: 2005
Wydawca:: Politechnika Gdańska
Tematy:: queuing systems
web-distributed applications
computer networks simulation
communication systems
web interaction paradigms
Opis:: Modern Internet and web applications involve interactions among remote host computers connected by communication networks. Simulation modelling is an important technique to evaluate performance in the implementation of a web-distributed application over given networks formed by computer hosts connected by heterogeneous networks. In this paper we extend a previous work concerning the construction of a queue-based simulator of communication networks. We define a set of new queue-based object types which permit us to specify the behaviour of a web-distributed application whose software components run over different hosts in a given communication network. We apply this technique to show how to build a simulator to evaluate the performance of various software architectures for a web-distributed application run over a given computer network.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 4; 373-396
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Fixed channel assignment in cellular communication systems considering the whole set of packed patterns. An investigation based on metaheuristics
Autorzy:: Borges, P.
Vidal, R.
Powiązania:: https://bibliotekanauki.pl/articles/206293.pdf
Data publikacji:: 2000
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: channel allocation
channel assignment
heuristics
mobile communication systems
patterns
search methods
Opis:: This paper addresses the problem of fixed channel assignment in cellular communication systems with nonuniform traffic distribution. The objective of the channel assignment is to minimise the average blocking probability. Methods for finding a good allocation can be based on first building a number of sets of cochannel cells or allocation patterns and then assigning them to channels. This usually implies that only a subset of the feasible region is attainable. The approach suggested in this paper uses the concept of packed pattern, since all patterns in an optimal solution will be of that kind. With a constructive method, the entire set of packed patterns is built and used in the optimisation process. The complexity (large-scale and nonlinearity) of the resulting problem suggested the use of general search procedures (local search, tabu search, simulated annealing, etc.), which have the further advantage of flexibility when dealing with extensions to the problem. A neighbouring structure was used, that facilitated the calculations while still allowing for the search in the entire solution space. A summary of extensive numerical experiments is presented. The outcome is an improvement over previous results.
Źródło:: Control and Cybernetics; 2000, 29, 3; 685-700
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Nonlinear optics of the thin-film quasiwaveguide amplifier: applications to directional switching in the optical communication systems
Autorzy:: Djotyan, G.P.
Arutunyan, V.M.
Bakos, J.S.
Sörlei, Z.
Powiązania:: https://bibliotekanauki.pl/articles/308725.pdf
Data publikacji:: 2000
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: thin-film laser
directoral switching
four-wave mixing
optical communication systems
Opis:: We examine nonlinear optical effects in the active medium of the thin-film quasiwaveguide amplifier-oscillator with injection of the external signal. The injection locking has been obtained in the case when both the frequency and the direction of propagation of the injected signal differ from those for a free-running thin-film laser which offers a possibility for the frequency and directional switching of the output of the thin-film laser. The effects of four wave mixing and phase conjugation have been discussed in the active medium of the thin-film laser when additional mirrors forming an external resonator have been used.
Źródło:: Journal of Telecommunications and Information Technology; 2000, 1-2; 20-23
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Maritime radio systems for distress alerting
Autorzy:: Korcz, K.
Powiązania:: https://bibliotekanauki.pl/articles/245315.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: communication systems
maritime distress communication
maritime distress alerting
systemy komunikacyjne
komunikacja morska
alarm morski
Opis:: The most important function of a maritime radio communication system called the Global Maritime Distress and Safety System (GMDSS) is the distress alerting function. Distress alerting is the rapid and successful reporting of a distress incident to a unit, which can provide or co-ordinate assistance. This would be a rescue co-ordination centre (RCC) or another ship in the vicinity. The article presents and evaluates the technical and operational possibilities of the maritime radio systems for a distress alerting. Especially the basic functional requirements and regulations for GMDSS referring to the maritime radio systems for distress alerting, resulting from the provisions of the International Convention for the Safety of Life at Sea (SOLAS) and Radio Regulations have been described. The article presents the role of the maritime radio systems for a distress alerting in the shipping and GMDSS as well. A current status and analysis of the systems responsible for distress alerting has been made. In this context, the operation, methods and ranges of transmitting and receiving the distress alerts by the INMARSAT system, COSPAS-SARSAT system and Digital Selective Calling (DSC) system have been described. The article also outlines the future of the maritime radio systems for a distress alerting. In this context, the two projects under the name of „E-navigation” and „The modernization of the GMDSS”, currently being implemented in the framework of the International Maritime Organization (IMO) by the Sub-Committee on Navigation, Communications and Search and Rescue (NCSR), have been presented as well.
Źródło:: Journal of KONES; 2018, 25, 1; 233-240
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Photonics and Web Engineering 2011
Autorzy:: Romaniuk, R. S.
Powiązania:: https://bibliotekanauki.pl/articles/226302.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nanomaterials
optical fibers
optoelectronics
photonics
measurement systems
optical communication systems
photonic sources and detectors
Opis:: The paper presents a digest of chosen technical work results shown by young researchers from different technical universities in this country during the SPIE-IEEE Wilga 2011 symposium on Photonics and Web Engineering. Topical tracks of the symposium embraced, among others, nanomaterials and nanotechnologies for photonics and telecom, sensory and nonlinear optical fibers, object oriented design of hardware, photonic metrology, optoelectronics and photonics applications, photonics-electronics co-design, optoelectronic and electronic systems for telecom, astronomy and high energy physics experiments, JET and pi-of-the sky experiments development. The symposium is an annual summary in the development of numerable Ph.D. theses carried out in this country in the area of advanced electronic and photonic systems. It is also an occasion for young researchers to meet together in a large group (under the patronage of IEEE) spanning the whole country with guests from this part of Europe. A digest of Wilga references is presented [1-92].
Źródło:: International Journal of Electronics and Telecommunications; 2011, 57, 3; 421-428
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

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

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Skocz do pozycji: 15.

Tytuł:: The logical control of road traffic net and railway junction
Autorzy:: Wierzcholski, K.
Powiązania:: https://bibliotekanauki.pl/articles/241899.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: logical communication systems
tracks optimization
optimum road traffic
logical functors for traffic kind
Opis:: The numerous tribology problems occurring in power-train and transport industry lead to wear of vehicles and trains as well as to wear of road or tracks. The choice of the proper way traffic or transport requires to select the kind of the way and the kind of the vehicles which shall be driving on the track. Especially the project designer demand the more and more information referring the wear of track anticipation in succeeding years of vehicle operation. Such wear of track anticipation is strictly connected with the choice of the kind of communication or traffic. To satisfy the abovementioned problem, it is necessary to construct the logical control system for road traffic. Mentioned logical system enables to control of management of the road traffic or railway junction. The presented in this paper logical system consists the description of the logical functors and their mutually connections. Here are introduced three kinds of functors namely, open functor, closed functor and special functor. Each logical functor describes the signal features which will be controlled. The various functor connections occurring in considered communication systems are determined from practical problems where the influence of various operating parameters on the wear effects is taking into account. The influence of numerous operating parameters on the wear effects are experimentally determined and implemented into the systems in the case if mentioned parameters are independent as well if are mutually connected. Moreover in this paper the various communication systems will be presented and will be suggested an algorithm construction of the optimum problem solutions presenting the equivalent and simultaneously most simple communication system.
Źródło:: Journal of KONES; 2015, 22, 2; 279-286
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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