Temat: Service quality - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: New Metric for World Wide Web Service Quality
Autorzy:: Uhl, T.
Klink, J.
Bardowski, D.
Powiązania:: https://bibliotekanauki.pl/articles/307815.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: Apdex
G.1030
QoE
QoS
quality metrics
service quality assessment
WWW service quality
Opis:: The main topic of this paper is the quality of the WWW service evaluation. The authors present well-known measurement methods, and present the new “Power” metric for quality, advocating it as a method of assessing the quality of such service. This metric is based on the most important network parameters that affect any assessment of the WWW service, i.e. Web page opening time and download data transfer rate. The new method is easy to implement, fast in operation, and provides stable and repeatable results.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 2; 50-58
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Goals and Benefits of Network Modelling in a Commercial Environment
Autorzy:: Smith, E.
Powiązania:: https://bibliotekanauki.pl/articles/307824.pdf
Data publikacji:: 2013
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: emulation
modelling
performance
service quality
simulation
Opis:: Modelling is a technique that can be used in the development and sizing of networks. It involves building a mathematical representation of a physical system and is often computer based, allowing system behaviour to be investigated based on the variation of key parameters. This pa- per will describe some applicable tools for network modelling and consider a range of applications. Whilst modelling and simulation tools are used extensively to design and size ICT solutions, each tool tends to be targeted at a specific range of applications and a specific user community. It is shown that different tools expect different levels of expertise from their user communities. The benefits of using such tools are described, as are some of their limitations. Modelling and simulation provide a cheaper and faster approach to trying new ideas than building prototypes or test networks. They provide a valuable guide to designing networks and can predict operational outcomes.
Źródło:: Journal of Telecommunications and Information Technology; 2013, 1; 25-31
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Distributed, asynchronous algorithms for network control with contracted flow rates - a review
Autorzy:: Karbowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/308928.pdf
Data publikacji:: 2006
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: computer networks
asynchronous algorithms
distributed optimization
routing
service level agreement
service quality
Opis:: The paper reviews current algorithms for distributed, asynchronous control of networks when the customer is guaranteed to get some predetermined (e.g., as a part of a service level agreement - SLA) values of flow. Two cases are considered - both with single and multiple commodity. It is assumed, that the flow cost functions are convex with special attention devoted to linear and strictly convex cases.
Źródło:: Journal of Telecommunications and Information Technology; 2006, 4; 46-52
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

Tytuł:: Rozbudowa funkcjonalna systemu oceny sieci telekomunikacyjnych AWP-IŁ
Development of the AWP-IŁ test system for PSTN and ISDN networks
Autorzy:: Godlewski, P.
Chojnacki, B.
Powiązania:: https://bibliotekanauki.pl/articles/317718.pdf
Data publikacji:: 2008
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: badanie sieci telekomunikacyjnej
monitorowanie jakości usługi
sieci telefoniczne
sieci ISDN
testing of telephone network
service quality monitoring
PSTN
ISDN
Opis:: Omówiono system AWP-IŁ do oceny jakości sieci u operatorów świadczących powszechne usługi telekomunikacyjne, począwszy od powstania w 1998 r. koncepcji systemu, aż do jego postaci eksploatowanej obecnie.
The paper presents the automatic AWP-IŁ system used for testing of service quality in public PSTN and ISDN networks. This includes the history of system development, from the initial concept which appeared in 1998 to the current version.
Źródło:: Telekomunikacja i Techniki Informacyjne; 2008, 3-4; 49-66
1640-1549
1899-8933
Pojawia się w:: Telekomunikacja i Techniki Informacyjne
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

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

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Skocz do pozycji: 9.

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

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Skocz do pozycji: 10.

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

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Skocz do pozycji: 11.

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

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Skocz do pozycji: 12.

Tytuł:: DiffServ Aware MPLS Traffic Engineering for ISP Networks: State of the Art and New Trends
Autorzy:: Toguyéni, A.
Korbaa, O.
Powiązania:: https://bibliotekanauki.pl/articles/308811.pdf
Data publikacji:: 2009
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: differentiated service
multipath routing
QoS routing
quality of service
traffic engineering
Opis:: In the recent ten years, with the development of new applications through Internet such as multimedia or networked control applications, users need more and more quality of service (QoS). However, the requested QoS is not the same depending on the application. Most of the new models to manage internet traffic are based on specific QoS criteria which should be optimized. This paper presents main multiprotocol label switching (MPLS) approaches such as MPLS adaptive traffic engineering (MATE), load distribution in MPLS (LDM) and load balancing over widest disjoints paths (LBWDP) that are new models for traffic engineering. It also introduces periodic multi-step (PEMS) algorithm that adapts the offered quality depending on the class of the routed traffic.
Źródło:: Journal of Telecommunications and Information Technology; 2009, 1; 5-13
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: On the Influence of Network Impairments on YouTube Video Streaming
Autorzy:: Biernacki, A.
Metzger, F.
Tutschku, K.
Powiązania:: https://bibliotekanauki.pl/articles/309310.pdf
Data publikacji:: 2012
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: multimedia communication
network measurements
quality of service
video streaming
Opis:: Video sharing services like YouTube have become very popular which consequently results in a drastic shift of the Internet traffic statistic. When transmitting video content over packet based networks, stringent quality of service (QoS) constraints must be met in order to provide the comparable level of quality to a traditional broadcast television. However, the packet transmission is influenced by delays and losses of data packets which can have devastating influence on the perceived quality of the video. Therefore, we conducted an experimental evaluation of HTTP based video transmission focusing on how they react to packet delay and loss. Through this analysis we investigated how long video playback is stalled and how often re-buffering events take place. Our analysis revealed threshold levels for the packet delay, packet losses and network throughput which should not be exceeded in order to preserve smooth video transmission.
Źródło:: Journal of Telecommunications and Information Technology; 2012, 3; 83-90
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

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

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Skocz do pozycji: 15.

Tytuł:: Videotoms in Objective and Subjective Quality Tests of Video
Autorzy:: Trzcianowski, Ł
Powiązania:: https://bibliotekanauki.pl/articles/308283.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: Digital Television
IPTV
quality of service
Video-toms
VoD
Opis:: This paper proposes idea of videotoms usage in quality tests of video signals. This concept simplifies parametric model creation for television services such as IPTV (Internet Protocol Television), VoD (Video on Demand) and others. Videotom is simple, well-defined video sequence in the context of video quality tests. Presented idea was used in both objective and subjective tests of influence selected network parameters: jitter of delay, packet loss and packet corrupt on the video quality measured using Mean Square Error (MSE) and Mean Opinion Score (MOS) metrics. Results showed that proposed method is useful especially for subjective tests and it can reduce costs and time for them.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 1; 27-31
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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