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Wyświetlanie 1-15 z 224
Tytuł:
Review of traffic control algorithms in computer networks
Autorzy:
Barczak, A.
Sitkiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/92855.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
traffic control algorithms
computer networks
traffic control in computer networks
Opis:
This paper presents comparison of popular traffic control algorithms in computer networks. It also contains descriptions of functioning of these algorithms. The first part of this paper contains description of evaluation criteria of traffic control algorithms (from system and user viewpoint). The second part of article contains description of new algorithms, which are theoretically improved or brand new, just introduced for practical use. These algorithms are developmental and eliminate disadvantages of already existing algorithms. The third part of this paper contains description of classical algorithms, which are well known, described and researched. It contains also propositions of modifications of classical linear programming algorithms. These modifications are for adjusting these algorithms to described problem.
Źródło:
Studia Informatica : systems and information technology; 2008, 2(11); 15-26
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specjalizowane rekonfigurowalne sterowniki poziomu lokalnego w inteligentnych systemach transportowych ITS
Specialized reconfigurable controllers of local level in ITS
Autorzy:
Kawalec, P.
Powiązania:
https://bibliotekanauki.pl/articles/155097.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sterowanie ruchem drogowym
sterowniki obszarowe
FPGA
SoC
control traffic
controllers area
Opis:
W artykule przedstawiono możliwość wykorzystania specjalizowanych sterowników ruchu drogowego, zaimplementowanych w układach FPGA, nie tylko na poziomie lokalnym, lecz również w sterowaniu obszarowym, a więc w zakresie właściwych ITS. Na przykładzie rzeczywistego obszaru sterowania, obejmującego kilka skrzyżowań, zaprezentowano proces specyfikacji, syntezy i implementacji takich sterowników w technice SoC.Dla konkretnego układu FPGA przytoczono raporty z wykorzystania zasobów i uzyskanych parametrów czasowych sterownika obszarowego.
In contrast to industrial process control systems, the achievements of contemporary electronics of the last several years, such as work-ing out hardware description language HDL, and accessibility of programmable logic devices FPGA have not been used in designing control devices of local level of ITS [4] up to the present moment. The paper presents an original methodology for design of new class local controllers of road traffic in railway traffic control implemented in programmable logic devices. The research results obtained at the Faculty of Transport (Warsaw University of Technology) of specialized prototypes of single-system reconfiguration controllers SoC show that the operating speed of such controllers exceeds the speed of currently used microprocessor controllers by hundreds of thousands times, with the improvement of reliability parameters by hundreds of times. It has been shown that the proposed class of specialized controllers can be used not only on the local level, but they can also be used for area controlling, encompassing several crossroads. The process of specification, synthesis and implementation of such a controller in SoC technology has been presented for a sample area of three neighboring crossroads (Figs.1 and 2). The example presented shows that specialized reconfigured road traffic controllers implemented in FPGA (Fig. 3)devices can be used not only on the local level, but also on area controlling level, and so in ITS.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 8, 8; 848-850
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected problems to support decision making in a simulation environment
Autorzy:
Gołda, P.
Powiązania:
https://bibliotekanauki.pl/articles/241881.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
air traffic control
aircraft operation
airport
Opis:
The article is devoted to the problem of decision support in a simulation environment prepared for the air traffic control service. The limitations resulting from the functionality of the airport have been presented. In addition, the “integration” problems resulting from the movement of aircraft on the apron have been presented. The article outlines optimization problems such as minimizing the total taxiing time, taking into account the waiting time for the start of the runway, minimizing the time elapsed from the first taxiing to the end of taxiing by the last aircraft or multi-faceted functions, including, for example, penalties for deviations from the schedule of take-off / landing operations, failure to keep the CFMU time slots, or for too long taxiing cycles. The article presents restrictions on taxiing of aircraft, integration with other airport operations, decision problems and applied algorithms, groups of restrictions on taxiing of aircraft, scheduled flight table, dependencies between individual operations, positioning of aircraft.
Źródło:
Journal of KONES; 2018, 25, 4; 111-117
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety of single-channel railway traffic control
Autorzy:
Pniewski, Roman
Powiązania:
https://bibliotekanauki.pl/articles/215253.pdf
Data publikacji:
2020
Wydawca:
Instytut Kolejnictwa
Tematy:
reversible logic
railway traffic control
safety
Opis:
Reversible gates enable the creation of fault tolerant digital devices. The application of these gates allows safe control systems to be realized. At present, control systems based on relays are being replaced by systems based on computer technology. This technology allows the implementation of safe systems. Because this system is composed of many elements, it is very difficult to obtain a high safety level for it. The application of reversible logic in the synthesis of digital systems constitutes an alternative approach. The paper presents reversible gates along with examples of their usage in the synthesis of digital systems. The main advantage of reversible logic is the possibility of synthesis of self testing and fault tolerant circuits. The application of circuits based on reversible logic allows safe control systems to be developed. The paper also presents a proposal for the application of reversible logic in simple control systems.
Źródło:
Problemy Kolejnictwa; 2020, 186; 125-131
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functional testing of railway traffic control device
Autorzy:
Drózd, Paweł
Rosiński, Adam
Konopiński, Lech
Powiązania:
https://bibliotekanauki.pl/articles/215152.pdf
Data publikacji:
2020
Wydawca:
Instytut Kolejnictwa
Tematy:
functional tests
railway traffic control devices
tests
Opis:
The article presents the problems of functional tests of railway traffic control devices. The purpose and scope of the tests as well as the impact of testing on the SRK devices are presented. The methodology of selecting tests depending on the scope of research is proposed. For this purpose, the SRK devices were analyzed for functional and diagnostic properties.
Źródło:
Problemy Kolejnictwa; 2020, 186; 91-96
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of ATM and IP QoS network capabilities for handling LAN traffic with QoS differentiation
Autorzy:
Bęben, A.
Burakowski, W.
Pyda, P.
Powiązania:
https://bibliotekanauki.pl/articles/309369.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
traffic control
IP QoS
asynchronous transfer mode
Opis:
Now, a network operator must choose between two packet switched technologies for providing QoS in WAN networks, which are ATM and IP QoS [3, 4, 9]. As ATM has reached the maturity with capabilities for offering a number of different network services (i.e. CBR, VBR, ABR, UBR, GFR), the IP QoS with network services like expedited forwarding, assured forwarding, etc. is still at developing phase but never-theless is commonly regarded as capable to guarantee in near future similar QoS level as ATM. This paper tries to compare the efficiency of the mentioned technologies (in case of IP QoS network the AQUILA network concept [1, 2] is investigated) for handling traffic generated by LANs with QoS differentiation. This is extremely required since the applications running in LAN differ in QoS requirements and emitted traffic profiles (streaming, elastic). Therefore, a classification process of outgoing LAN traffic into predefined sub-streams should be performed at the entry point to WAN network (edge ATM switch or IP router). Furthermore, particular sub-streams are submitted to adequate WAN network service, available in ATM or IP QoS. The paper presents the experimental results, measured in the test bed, corresponding to QoS level and QoS differentiation provided by ATM and IP QoS core.For this purpose, a set of representative applications currently available to a LAN user was selected demanding from the core different QoS level. They correspond to streaming applications like VoIP with QoS objectives represented mainly by packet delay characteristics and elastic applications controlled by TCP protocol with minimum guaranteed through-put/goodput as target.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 4; 25-31
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integration of multiagent crossing controllers for measure-oriented traffic control
Autorzy:
Trochonowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/106172.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
multi-agent systems
traffic control
sensors
MATSim
Opis:
In this paper we will present an integration of multiagent crossing controllers for measure oriented traffic control. It is the basis for the future multiagent traffic control system which uses measure oriented approach to control traffic. This integrated architecture gives us the possibility to react to the dynamic changes of traffic thanks to the data it can gather with its sensors.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2013, 13, 1; 97-105
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Traffic control algorithms in computer networks. Part 2, Simulation researches of the algorithms
Autorzy:
Barczak, A.
Sitkiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/93004.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
traffic control algorithms
computer networks
traffic simulation in networks
Opis:
This article is the continuation of the first part entitled Review of algorithms. In the article presented were the author's simulator of a network and the tests performed with its help. In the first part the concept and functionality of the created simulator were described. The concept emerged on the basis of an analysis of existing solutions, as well as needs the created software has to fulfill. The second part of the article depicts the testing environment, i.e. network topology and simulation parameters used during the research. What is more, in the aforementioned part, provided was the comparison of the research run with the use of the author's software and its interpretation.
Źródło:
Studia Informatica : systems and information technology; 2009, 2(13); 5-19
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urban transport safety improvement based on centralized traffic control system, colombian case study
Autorzy:
Berrío, J. S.
Dussich, D.
Szpytko, J.
Powiązania:
https://bibliotekanauki.pl/articles/243545.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
traffic control
centralized control
software development
wireless communication controller
Opis:
In a modern urban organization, mobility is an important issue for society. Traffic congestion of urban roads undermines mobility is a real problem in major cities This article shows the development and implementation of a centralized traffic control system in the city of Cali Valle (Colombia) applied to control traffic lights located to the east of the city (Simon Bolivar and Ciudad de Cali highways), allowing the central operators directly influence the traffic flow, know and display the status of the lights and generate statistics about the events of the online equipment. Particular real benefits of proposed new system of traffic lights are reflected in green times at each intersection allocated in accordance with the present traffic volumes on the road network at any time of day and in every sector of the city in particular, which of course increases the efficiency of each light installed at each intersection. As demonstrated in this article case study, the congestion scheme has been improved, and the project has opened up vast opportunities for innovative network management strategies for the optimization of network performance. Many of these strategies are developed to give a coordinated high-level control across different traffic control platforms based on real time traffic condition and performance on site.
Źródło:
Journal of KONES; 2017, 24, 2; 39-46
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problematyka bezpieczeństwa i ryzyka na przykładzie urządzeń sterowania ruchem kolejowym
Issues of the safety and risks on the example of devices of control command railway systems
Autorzy:
Białoń, A.
Pawlik, M.
Powiązania:
https://bibliotekanauki.pl/articles/250343.pdf
Data publikacji:
2015
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
bezpieczeństwo
ryzyko
sterowanie ruchem kolejowym
security
risk
control railway traffic
Opis:
Analiza ryzyka jest niezwykle istotnym elementem przy projektowaniu, produkcji i eksploatacji urządzeń technicznych. Zapisy pojawiające się w niektórych normach dotyczących urządzeń srk, szczególnie związanych z bezpieczeństwem, nakładają wręcz na zespoły projektujące i produkujące urządzenia obowiązek przeprowadzania analizy ryzyka. Dowód na to stanowi norma PN-EN 50126, w której pokazany jest cykl życia systemu (np. urządzeń srk). Analiza ryzyka jest tu, jak pokazano na rys. 1, niezbędnym i istotnym elementem cyklu życia systemu. Również przy analizie bezpieczeństwa, niezbędnej do opracowania dowodu bezpieczeństwa, a przeprowadzanej zgodnie z normą PN-EN 50129, istotne znaczenie ma analiza ryzyka. Analiza ryzyka i ryzyko są nierozerwalnie połączone z bezpieczeństwem systemu, dlatego też bierze się je pod uwagę przy podejmowaniu decyzji o stosowaniu systemu.
Article describes safety estimation rules used in railway transport on the example of control command and signalling systems safety estimation. Methods described in the European standards as well as methods described in the European Commission Regulations have been analysed. Different safety assessment methods were pointed and qualitative and quantitative safety estimation methods were described and compared. Taking control command and signalling systems as an example article describes possible faults and threats which may be caused by them. In accordance with the European Community law risk is described as a joint result of single threat consequences and its' probability (threat frequency). Article describes ways used to create lists of threats. Risk for different threat is then estimated and compared with risk acceptance criteria and included in safety management systems of the railway infrastructure managers and railway undertakings.
Źródło:
TTS Technika Transportu Szynowego; 2015, 3; 20-25
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of changing station layout over railway interlocking
Autorzy:
Jurczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/393441.pdf
Data publikacji:
2012
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
projekt koleji
sterowanie ruchem
railroad project
traffic control
Opis:
The aim of the article is to present the influence of changing station layout over interlocking systems in train routes. There is often a problem in the process of doing for example application of interlocking system in exactly bigger stations when there are track changes in next phases of the project. Vividly small changes can influence in significant way for realization train and manoeuvre routes in such station. In case of that it is necessary to search the shortest road of making documentation and software which could be changes resistant. This resistance resulted by for example necessity of continuing leading railway when there is modernization on the station.
Źródło:
Archives of Transport System Telematics; 2012, 5, 3; 8-13
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of ant algorithm in the assignment problem of aircrafts to stops points on the apron
Autorzy:
Gołda, P.
Izdebski, M.
Szczepański, E.
Powiązania:
https://bibliotekanauki.pl/articles/245325.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
air transportation
air traffic control
aircraft operation
airport
Opis:
The article refers to the problem of assigning the aircrafts to stops points on the apron. The aim of this paper is to develop the algorithm, which will be used to this assignment. The assignment problem of aircrafts to stops points is the complex decision problems, which refer to the problems of designating the minimal path in the graph. The assignment model was described, i.e. decision variables, constraints and the criterion function. Decision variables take the binary form and determine the connections between the elements of infrastructure of the apron, i.e. touchdown points, intermediate points and stop points. Constraints take into account the number of aircrafts in the given period, the number of unoccupied stop points. The criterion function determines the minimum driving time of the aircraft on the apron. In order to designate the routes in international transport the heuristic algorithm, i.e. ant algorithm was developed. The steps of building this algorithm were presented. This algorithm was verified in the C# programming language. The results generating by the presented algorithm were compared with the results generating by the random algorithm.
Źródło:
Journal of KONES; 2018, 25, 4; 479-487
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of the test method for trackside emissions of magnetic disturbances from rolling stock according to ERA/ERTMS/033281
Autorzy:
Nagórny, Bartłomiej
Maćkowiak, Adam
Rokossowski, Michał
Sieczkarek, Krzysztof
Szczepański, Radosław
Warzyński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/32101665.pdf
Data publikacji:
2022-08-29
Wydawca:
Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
Tematy:
EMC testing
LabView software
railway transport
traffic control
Opis:
The aim of the work presented in this article was to made and implement original computer software made in the LabVIEW environment. That program automate the measurement of emissions of magnetic disturbances coming from rolling stock. It is dedicated for oscilloscope card and RSAL 5340, RSAH 5324 rolling stock antennas for axle counter. The indicated algorithms of proceeding coming directly from the standards, additional own methods of fast data analysis was made. Communication between the measurement cards and computer using USB with self-power USB hab was used. The software is fully compatible with the requirements contained in the ERA/ERTMS/033281.
Źródło:
Rail Vehicles/Pojazdy Szynowe; 2022, 1-2; 62-67
0138-0370
2719-9630
Pojawia się w:
Rail Vehicles/Pojazdy Szynowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Passage Planning System in Ports: An overview
Autorzy:
Yip, T. L.
Powiązania:
https://bibliotekanauki.pl/articles/116807.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Sea Ports
Passage Planning
Passage Planning System in Ports
Maritime Traffic
Traffic Control
Vessel Traffic Control
vessel traffic service (VTS)
Passage Planning System (PPS)
Opis:
A conceptual model is proposed to monitor marine traffic through precautionary areas, which can provide us with a systematic control of passage planning in ports. On one hand, vessel traffic control has its special features and is fundamentally different from highway, air and pedestrian traffic control. The existing traffic control systems cannot be simply extended to vessel traffic control without addressing marine traffic features. On the other hand, existing vessel traffic control focuses on one ship or two ships but does not address the flows of marine traffic.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 4; 483-487
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using Pre-emption For Dependable Urban Vehicle Traffic
Autorzy:
Letia, T.
Barbu, S.
Dinga, F.
Powiązania:
https://bibliotekanauki.pl/articles/384863.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
urban vehicle traffic control
real time scheduling
traffic congestion
real time control
dependability
Opis:
A new approach for design and implementation of urban vehicle control system is proposed. The vehicle streams on lanes are considered similar with the streams of instructions in multitask programs. Real-time scheduling algorithms are used to allocate the green lights to phases. An adaptive component is used to calculate new vehicle flow parameters when a failure appears as a consequence of an accident. The real-time schedulers use the parameters to obtain new feasible resource allocations.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 1; 40-45
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 224

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