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Wyświetlanie 1-15 z 126
Tytuł:
Telecom Operator’s Approach to QoE
Autorzy:
Kowalik, Karol
Andruloniw, Paweł
Partyka, Bartosz
Zwierzykowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2142309.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
quality of experience
quality of service
Opis:
Telecommunication networks are ever more frequently relying on artificial intelligence and machine learning techniques to detect specific use patterns or potential errors and to take automated decisions when these are encountered. This concept requires that methods be employed to measure the level of quality of a given telecommunication service, i.e. to verify quality of service (QoS) metrics. In a broader context, methods assessing the entire user experience (quality of experience – QoE) are required as well. In this article, various approaches to assessing QoS, QoE and the related metrics are presented, with a view to implement these at an FTTH network operator in Poland. Since this article presents the architecture of the system used to analyze QoE performance based on a number of QoS metrics collected by the operator, we also provide a comprehensive introduction to the QoS and QoE metrics used herein.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 2; 26--34
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lagrangian Relaxation and Linear Intersection Based QoS Routing Algorithm
Autorzy:
Stachowiak, K.
Zwierzykowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/226432.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Lagrangian relaxation
quality of service
routing
Opis:
Due to the process of network convergence, the variety of types of traffic transmitted over a single medium increases steeply. This phenomenon can be handled by the existing networking structure although the protocols that are used and, especially, the underlying routing protocols need to be improved. The problem of finding the shortest path on the Internet can no longer be easily defined as there is an increasing number of different characteristics to describe a point-to-point link. The definition of the shortest path may differ for different traffic types. Therefore, in the mathematical models used to solve the modern routing problems multiple criteria must be taken into account. One of the interesting classes of the optimization problem is the problem of finding the solution that is minimized against one of the criteria under certain constraints with regard to the others. In this paper, two algorithms solving this kind of problems are presented and compared with a new solution proposed by the authors.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 4; 307-314
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of the TQM evaluation in a service company
Autorzy:
Poliakova, Adela
Tomaszewska, Iwona
Gašparík, Jozef
Salamakhina, Ekaterina
Powiązania:
https://bibliotekanauki.pl/articles/1838310.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
total quality management
evaluation of quality
quality of service
Opis:
TQM is a term associated mainly with ensuring the quality of production, where the emphasis is on quality in all parts of the production process. The introduction of TQM into the operation of a service company therefore seems to be more difficult. In the presented article we address the basic requirements for the introduction of TQM in a company providing road freight transport. The basic PDCA approach needs to be implemented in all processes of the actors involved in the supply chain. The article points out the fact that evaluating the quality of the provided service only on the basis of a single indicator, which is the monitoring of the number of complaints and claims, is not sufficient as evidence of the established TQM system. The customer requires evidence of long-term and serious monitoring. As part of this monitoring, it proposes the creation of an effective evaluation system for evaluating the quality of the external service provider. To determine the priority requirements of the customer, it is appropriate to apply several known simple evaluation methods. In the article, we applied the pairwise comparison method and the Saaty’s method to determine the order of importance of the quality criteria that we previously found in the customer survey: integrity of the consignment, compliance with the agreed delivery time and completeness of the shipment, including documents. We therefore recommend focusing on these criteria when providing TQM in the company.
Źródło:
Archiwum Motoryzacji; 2021, 93, 3; 27-37
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concept for a Measurement Management System for Access Service to the Internet
Autorzy:
Klink, J. H.
Podolska, M. J.
Uhl, T.
Powiązania:
https://bibliotekanauki.pl/articles/308600.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Internet
Measurement Management Systems
quality of service
Opis:
This paper describes the problems associated with the provision of quality of service over an access connection to the Internet, i.e. the Internet Access Service (IAS). The paper has something of an overview character. Following a comprehensive introduction to the subject of “Changing Network Technologies” the paper focuses on the topic “Quality of IAS” in the light of regulatory directives of the European Parliament and the latest recommendations of ITU-T and ETSI. The focus will then shift to “Measurement Points and Measurement Scenarios for Determining QoS”. This topic will be described in detail and illustrated with several graphics. The final chapter has a pronounced scientific character and contains, among other things, a suggestion for a so-called Measurement Management System (MMS) to aid the design, execution and evaluation of efficient, automatic QoS measurements in networks.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 3; 60-69
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Multicast Algorithm Evaluation Results in Low and High Multicast Saturation Environments
Autorzy:
Stachowiak, Krzysztof
Zwierzykowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/309461.pdf
Data publikacji:
2019
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
quality of service
multicast
routing
multicast saturation
Opis:
The multicast quality of service-enabled routing is a computationally challenging task. Despite ongoing research efforts, the associated mathematical problems are still considered to be NP-hard. In certain applications, computational complexity of finding the optimal connection between a set of network devices may be a particularly difficult challenge. For example, connecting a small group of participants of a teleconference is not much more complex than setting up a set of mutual point-to-point connections. On the other hand, satisfying the demand for such services as IPTV, with their receivers constituting the majority of the network, requires applying appropriate optimization methods in order to ensure real system execution. In this paper, algorithms solving this class of problems are considered. The notion of multicast saturation is introduced to measure the amount of multicast participants relative to the entire network, and the efficiency of the analyzed algorithms is evaluated for different saturation degrees.
Źródło:
Journal of Telecommunications and Information Technology; 2019, 3; 3-7
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Management methods in SLA-aware distributed storage systems
Autorzy:
Nikolow, D.
Słota, R.
Lakovic, D.
Winiarczyk, P.
Pogoda, M.
Kitowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/305462.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
service level agreements
mass storage systems
quality of service
Opis:
Traditional data storage systems provide access to user’s data on the "best effort" basis. While this paradigm is sufficient in many use cases it becomes an obstacle for applications with Quality of Service (QoS) constraints. Service Level Agreement (SLA) is a part of the contract agreed between the service provider and the client and contains a set of well defined QoS requirements regarding the provided service and the penalties applied in case of violations. In the paper we propose a set of SLA parameters and QoS metrics relevant to data storage processes and the management methods necessary for avoiding SLA violations. A key assumption in the proposed approach is that the underlying distributed storage system does not provide functionality for resource or bandwidth reservation for a given client request.
Źródło:
Computer Science; 2012, 13 (3); 35-44
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimising server energy consumption and response time
Autorzy:
Gelenbe, E.
Lent, R.
Powiązania:
https://bibliotekanauki.pl/articles/375677.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy consumption
quality of service
optimisation
computer systems
Opis:
The predicted annual growth of energy consumption in ICT by 4% towards 2020, despite improvements and efficiency gains in technology, is challenging our ability to claim that ICT is providing overall gains in energy efficiency and Carbon Imprint as computers and networks are increasingly used in all sectors of activity. Thus we must find means to limit this increase and preserve quality of service (QoS) in computer systems and networks. Since the energy consumed in ICT is related to system load, ]this paper discusses the choice of system load that offers the best trade-off between energy consumption and QoS.We use both simple queueing models and measurements to develop and illustrate the results. A discussion is also provided regarding future research directions.
Źródło:
Theoretical and Applied Informatics; 2012, 24, 4; 257-270
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximated self-similar process for generation of ICT traffic
Autorzy:
Włodarski, P.
Powiązania:
https://bibliotekanauki.pl/articles/378345.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
ICT
Information and Communications Technologies
quality of service
Opis:
Self-similar nature of ICT traffic causes big impact on queuing performance needed in providing a certain level of Quality of Service. Therefore, synthesis of fractal process for simulation and analysis purposes should be fast and accurate. In this article it is proposed how to simplify distribution of interarrivals in the renewal process in order to implement the inverse distribution technique to generate random variables. Proposed method improves simulation performance by reducing computational complexity leaving the accuracy almost unchanged.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 70; 233-239
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of passenger streams and service quality of an urban transport company
Autorzy:
Markowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/949499.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
passenger streams
passenger Transport Company
quality of service
Opis:
Passenger transport companies increasingly aim to implement passenger transport services of improved efficiency and effectiveness by raising the comfort of travel and ensuring passenger satisfaction by increasing quality of their service. The comfort of the journey is seen as security, punctuality, efficiency and friendly passenger service. The analysis and evaluation of the quality of passenger transport services allow to specify the time of travel, comfort, punctuality, availability of public transport links and the costs of transport services provided. The passenger streams and assessment of the urban transport services quality covered by this study allow for indication of problems in the researched area and suggestion of improvements in the transport services. The development of urban transport is subject to the increasing number of population, expansion of cities and constant technical progress. Expansion of cities and large number of citizens are closely linked to the urban transport allowing for the citizens’ mobility by various means of public transport. Carriage operations are repeatedly grouped according to travel direction, scale of demand for transport, the scope and length of the carriage, stability of transport needs or required transport speed.
Źródło:
Journal of KONES; 2016, 23, 4; 336-338
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Evaluation of Signaling in the IP QoS System
Autorzy:
Tarasiuk, H.
Śliwiński, J.
Arabas, P.
Jaskóła, P.
Góralski, W.
Powiązania:
https://bibliotekanauki.pl/articles/307864.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
IP QoS System
quality of service
signaling system
Opis:
The IP QoS System is based on next generation networks (NGN) and differentiated services (DiffServ) architectures. Its main part is a signaling system, which allows to send a request from a user to the system for establishing new connection with predefined quality of service assurance. In this paper we present trial results of the proposed signalling system. The experiments were performed to measure setup delay utilizing artificial call generator/analyzer. To obtain results we assumed different distributions of interarrival and call holding times based on the literature. The results show that the setup delay strongly depends on access time to network devices, however also on the assumed call holding time models.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 3; 12-20
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ganging of Resources via Fuzzy Manhattan Distance Similarity with Priority Tasks Scheduling in Cloud Computing
Autorzy:
Priya, S. S.
Mehata, K. M.
Banu, W. A.
Powiązania:
https://bibliotekanauki.pl/articles/308097.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
clustering
pre-processing
quality of service
resource allocation
Opis:
This paper proposes a fuzzy Manhattan distance-based similarity for gang formation of resources (FMDSGR) method with priority task scheduling in cloud computing. The proposed work decides which processor is to execute the current task in order to achieve efficient resource utilization and effective task scheduling. FMDSGR groups the resources into gangs which rely upon the similarity of resource characteristics in order to use the resources effectively. Then, the tasks are scheduled based on the priority in the gang of processors using gang-based priority scheduling (GPS). This reduces mainly the cost of deciding which processor is to execute the current task. Performance has been evaluated in terms of makespan, scheduling length ratio, speedup, efficiency and load balancing. CloudSim simulator is the toolkit used for simulation and for demonstrating experimental results in cloud computing environments.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 1; 32-41
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capacity and Quality Optimization of CDMA Networks
Autorzy:
Bamisaye, A. J.
Kolawole, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/308376.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
CDMA
link pilot
network planning
quality of service
Opis:
Coverage and capacity are important issues in the planning process for cellular third generation (3G) mobile networks. The planning process aims to allow the maximum number of users sending and receiving adequate signal strength in a cell. This paper describes the conceptual expressions require for network coverage and capacity optimization analysis, examines service quality issues, and presents practical solutions to problems common to sub-optimality of CDMA networks.
Źródło:
Journal of Telecommunications and Information Technology; 2010, 4; 101-104
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Contracting of IP Services - System Architecture and Prototype
Autorzy:
Arabas, P.
Kamola, M.
Powiązania:
https://bibliotekanauki.pl/articles/309102.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
DiffServ
dynamic contracts
IP network
quality of service
Opis:
Proposition of architecture and implementation of prototype system for dynamic contracting IP services is presented. The system serves requests issued by users demanding setting up network service of specified parameters. DiffServ technology together with traffic engineering and admission control are used. Implementation details and results of tests are described. Necessary extensions and possibility of commercialization of such a system are discussed.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 2; 43-52
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subjective Assessment for Standard Television Sequences and Videotoms - H.264/AVC Video Coding Standard
Autorzy:
Trzcianowski, Ł
Powiązania:
https://bibliotekanauki.pl/articles/307813.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
digital television
IPTV
quality of experience
quality of service
video-toms
Opis:
This paper presents comparison of videotoms and standard television sequences in terms of image distortions and perceived subjective quality affected by H.264/AVC compression with changed bit rate. Results from initial tests, performed as laboratory exercise can be a reference to show scale of diversity in both level of degradation and Mean Opinion Score (MOS) evaluation. Results and comments included in this paper give overview on the codec in uence on videotoms and can suggest approach for further tests and experiments.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 1; 37-41
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An approach to web service selection based on composite QOS parameters
Autorzy:
Kheradmand, M
Motameni, H
Powiązania:
https://bibliotekanauki.pl/articles/103133.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
web service
web service selection
quality of service
QoS composition
service reputation
Opis:
Quality of service (QoS) is an important attribute for selecting a service during the service composition process. Although availability and reliability have been considered as the predominant factors for estimating reputation, two aspects are missing in the literature. First, their use is limited to composite service level and does not count on the atomic level. Second, their combined effect is not evaluated. Better estimation of QoS can be done with both factors considered together, whereas when taken separately for computing reputation, availability will give the probability of a service being up/running and reliability will analyze the change in failure trend of that service. In this research, a mathematical modeling of predominant QoS factors, availability and reliability of atomic services using Markov Chain model and Weibull analysis respectively, are suggested. Also importance of modeling reputation as an aggregation of availability and reliability has been explained. This research concludes two results. First, counting on probability of a service being up/running and its failure trend, together, results in a better estimation of its behavior and helps selecting the most appropriate one. Second, this resulted in selection of a service with higher reputation but lower usage cost, as opposed to using a single factor that resulted in higher reputation with higher cost.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 26; 129-136
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 126

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