Temat: quality of experience - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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: 2.

Tytuł:: Measurements and Statistical Analysis for Assessment of Availability of Mobile Network Services
Autorzy:: Kadamus, G.
Langer, M.
Powiązania:: https://bibliotekanauki.pl/articles/308214.pdf
Data publikacji:: 2018
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: availability
Diversity Benchmarker
Monte Carlo
quality of experience
Opis:: Availability is an essential feature of telecommunication services. It inﬂuences the quality of experience (QoE) associated with individual networks and with the services offered. Therefore, it needs to be allowed for at each level of network design, and has to be controlled at the operation stage. This is achieved by means of various mathematical and numerical tools. In this project listening quality and speech level, which are quality-related features of mobile network services, are measured and analyzed with the Monte Carlo simulation method. Measurements are taken with assistance of the Diversity Benchmarker, a reliable device designed for mobile network testing. Finally, results obtained are compared to assess the applicability of the Monte Carlo method.
Źródło:: Journal of Telecommunications and Information Technology; 2018, 2; 48-52
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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: 4.

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

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Skocz do pozycji: 5.

Tytuł:: Digital Audio Broadcasting or Webcasting: A Network Quality Perspective
Autorzy:: Gilski, P.
Stefański, J.
Powiązania:: https://bibliotekanauki.pl/articles/308048.pdf
Data publikacji:: 2016
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: broadcast technology
mobile communications
quality of experience
quality of service
wireless communication
Opis:: In recent years, many alternative technologies of delivering audio content have emerged, with different advantages and disadvantages. In this paper pros and cons of digital audio broadcasting and webcasting transmission techniques in a network quality perspective are described. A case study of user expectations with respect to currently available services is analyzed, and the perceived quality of real digital broadcasted and webcasted radio stations is examined.
Źródło:: Journal of Telecommunications and Information Technology; 2016, 1; 9-15
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:: Quality of Variable Bitrate HD Video Transmission in New Generation Access Network
Autorzy:: Makowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/308077.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: congestion in access network
quality of experience
streaming
variable bitrate
Opis:: Article presents influence of multiplying variable bitrate high definition (HD) video streams in an access network link on Quality of Service (QoS). The aim of a conducted study is to define key parameters influencing Quality of Experience (QoE). Numerous simulations were performed and indicators like packet loss, delay, jitter, frame loss and bandwidth utilization were observed. Moreover, two independent algorithms were used to indicate QoE values of video streams. These are SwissQual VQuadHD and Telchemy VQMon applications which provided credible full reference and no reference algorithms, respectively. In the article evaluation of accuracy of no reference algorithm is performed. In future work it is planned to build analytic model of VBR video transmission and to undertake more thorough research of transmitting multiplied HD video streams in an access network using various QoS policies and optimizing size of buffers.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 1; 21-26
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:: Dimensioning aspects of SMS systems in mobile networks
Autorzy:: Klink, J.
Uhl, T.
Powiązania:: https://bibliotekanauki.pl/articles/134973.pdf
Data publikacji:: 2017
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: SMS
QoS
Quality of Experience (QoE)
text messaging
queueing system
dimensioning
Opis:: This paper focuses on factors affecting the dimensioning of Short Message Service (SMS) systems in mobile communications networks. Problems associated with Quality of Service (QoS) in modern communications networks in general are described, along with the main parameters that define QoS in SMS systems. The functionality of the SMS in terms of European Telecommunications Standards Institute (ETSI) standards is then explained. The creation of a queuing model is described for an SMS system which is based on ETSI documentation and will be analysed in calculations. The parameter completion rate plays an important role in SMS. Practical aspects of the End-to-End (E2E) delivery time for SMS systems are also discussed. The approach suggested in this paper and the insights gained in the course of this work can be of valuable practical use in the planning and analysis of real SMS systems.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 110-118
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analysis of Burst Ratio in Concatenated Channels
Autorzy:: Rachwalski, J.
Papier, Z.
Powiązania:: https://bibliotekanauki.pl/articles/309539.pdf
Data publikacji:: 2015
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: bursty packet loss
E-model
quality of experience
voice over IP
Opis:: Burst ratio is a parameter that quanties packet loss patterns in transmission networks. It has been dened for an end-to-end scenario, therefore burst ratio can be determined only if the characteristics of the whole transmission path are known. In this paper, the burst ratio parameter applicability to cases when the transmission path consists of a series of transmission channels with known packet loss rate and burst ratio values is extended. The paper also presents the results of simulations performed with NS2 software, demonstrating the validity of the burst ratio analysis. Consequently, the research makes it possible to determine the value of the burst ratio parameter in concatenated packet networks, which in turn supports delivering higher quality VoIP services.
Źródło:: Journal of Telecommunications and Information Technology; 2015, 4; 65-73
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:: Quality of experience in the context of mobile applications
Autorzy:: Nawrocki, P.
Śliwa, A.
Powiązania:: https://bibliotekanauki.pl/articles/305633.pdf
Data publikacji:: 2016
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: quality of experience (QoE)
mobile application
mobile device
Android system
quality of service (QoS)
Opis:: Mobile devices are among the most-popular means of browsing the Internet, sending and receiving e-mail, and sharing content on social networks. People use mobile devices and the applications installed on them in different situations throughout the day. In order to ensure that users are satisfied with a mobile application, its author has to ensure a high Quality of Experience level. The problem of automatic evaluation of the QoE parameter is a very interesting research area. Quality of Experience is a broad issue and requires the analysis of many aspects not only graphical user interfaces but also, inter alia, Quality of Service and user ratings.
Źródło:: Computer Science; 2016, 17 (3); 371-385
1508-2806
2300-7036
Pojawia się w:: Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Subjective and Objective Comparative Study of DAB+ Broadcast System
Autorzy:: Gilski, P.
Stefański, J.
Powiązania:: https://bibliotekanauki.pl/articles/177540.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: audio quality assessment
broadcasting
digital audio broadcasting
quality of experience
quality of service
radio communication
Opis:: Broadcasting services seek to optimize their use of bandwidth in order to maximize user’s quality of experience. They aim to transmit high-quality digital speech and music signals at the lowest bitrate. They intend to offer the best quality under available conditions. Due to bandwidth limitations, audio quality is in conflict with the number of transmitted radio programs. This paper analyzes whether the quality of real-time digital DAB+ broadcasted radio programs surpasses the quality offered by analog FM radio. We also perform a subjective and objective quality assessment comparative study of the HE-AAC v2 audio codec used in DAB+. The subjective studies were carried out using the MOS test methodology, whereas the objective tests were realized using the ViSQOLAudio metric. These studies were followed by a questionnaire concerning the migration from analog to digital radio domain.
Źródło:: Archives of Acoustics; 2017, 42, 1; 3-11
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

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

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Skocz do pozycji: 12.

Tytuł:: The Tourist Destination Management and Its Dynamism: The Case of Barcelona Versus Catalonia
Zarządzanie destynacją turystyczną i jego dynamika: przypadek Barcelony na tle Katalonii
Autorzy:: Alvado, Anna
Sorribes, Joan
Boyra, Josep
Powiązania:: https://bibliotekanauki.pl/articles/1597279.pdf
Data publikacji:: 2021-05-17
Wydawca:: Akademia Ignatianum w Krakowie
Tematy:: zarządzanie
konkurencyjność w turystyce
jakość doświadczenia
management
tourism competitiveness
quality of experience
Opis:: The present article tries to evaluate, from the analysis of different managerial components and factors, the degree of competitiveness and dynamism of a tourist destination. To carry out this analysis, the city of Barcelona and its role as the capital of Catalonia have been chosen. At a time of deep worldwide economic crisis due to Covid-19 pandemic tourism has declining by 70% worldwide during 2020. Nevertheless, tourism has demonstrated its great resilience and strength as a global engine for economic activities development generating jobs and wealth over the last decades. It is in this context, where the article analyzes the behavior of Barcelona, as a reference for the destination Catalonia, in front the pandemic crisis and the strength of new emerging tourism competitors. Indeed, the reorganization of the pattern of distribution of tourist flows in the global tourism market due to health restrictions and the pace of economic emitting powers recovery generates a significant number of new opportunities. Tourist flows are posing new challenges in terms of their reception, the management of their stay and the fulfillment of a high degree of satisfaction in relation to their tourist experience. This article analyses a series of strategies promoted by different agents and managers in the field of tourism to subsequently present a set of recommendations to help assist decision-making in a tourism sector that is going through difficult times.
Niniejszy artykuł stara się ocenić stopień konkurencyjności i dynamiki destynacji turystycznej na podstawie analizy różnych elementów i czynników zarządczych. Do przeprowadzenia analizy wybrano miasto Barcelonę i rolę jej stolicy Katalonii. W czasach głębokiego światowego kryzysu ekonomicznego z powodu pandemii Covid-19 w roku 2020 ruch turystyczny na całym świecie spadł o 70%. Niemniej, branża turystyczna wykazała wielką odporność i wytrzymałość jako globalny generator zatrudnienia i rozwoju działalności gospodarczej oraz bogactwa w ciągu ostatnich dziesięcioleci. To właśnie w tym kontekście artykuł analizuje zachowanie Barcelony jako punktu odniesienia dla destynacji, jaką jest Katalonia, w obliczu kryzysu pandemicznego i siły nowych, wschodzących konkurentów w turystyce. Reorganizacja struktury rozkładu ruchu turystycznego na światowym rynku turystycznym, spowodowana ograniczeniami zdrowotnymi i tempem odbudowy potęg gospodarczych, generuje bowiem znaczną liczbę nowych możliwości. Przepływy turystów tworzą nowe wyzwania w zakresie ich przyjmowania, zarządzania ich pobytem i zapewnienia wysokiego stopnia zadowolenia z doświadczenia turystycznego. Artykuł analizuje wiele strategii promowanych przez różnych agentów i menedżerów w dziedzinie turystyki, aby następnie przedstawić zbiór zaleceń, który wspomaga podejmowanie decyzji w sektorze turystycznym w trudnych czasach.
Źródło:: Perspektywy Kultury; 2021, 32, 1; 171-188
2081-1446
2719-8014
Pojawia się w:: Perspektywy Kultury
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: The Design of an Objective Metric and Construction of a Prototype System for Monitoring Perceived Quality (QoE) of Video Sequences
Autorzy:: Janowski, L.
Leszczuk, M.
Papir, Z.
Romaniak, P.
Powiązania:: https://bibliotekanauki.pl/articles/307891.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: mean opinion score
no reference metric
objective metric
quality of experience
video artefacts
Opis:: The paper presents different no reference (NR) objective metrics addressing the most important artefacts for raw (source) video sequences (noise, blur, exposure) and those introduced by compression (blocking, flickering) which can be used for assessing quality of experience. The validity of all metrics was verified under subjective tests.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 3; 87-94
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:: Study of No-Reference Video Quality Metrics for HEVC Compression
Autorzy:: Rouis, K.
Leszczuk, M.
Janowski, M.
Papir, Z.
Tahar, J. B. H.
Powiązania:: https://bibliotekanauki.pl/articles/307568.pdf
Data publikacji:: 2016
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: High Efficiency Video Coding (HEVC)
No-Reference metrics
Quality of Experience (QoE)
Video Quality Assessment
Opis:: The paper proposes a No-Reference (NR) quality assessment measurement originally developed for H.264, used for High Efficiency Video Coding (HEVC). In particular, authors present an investigation of NR metrics to objectively estimate the perceptual quality of a set of processed video sequences. The authors take into account typical distortions introduced by the block-based coding approaches like HEVC codec. The underlying processing used for the quality assessment considers the blockiness caused by the boundaries of each coded block and the blurring as a lack of spatial details. The correlation between the NR quality metrics and the well-known and most widely used objective metric, the Video Quality Model (VQM), is performed to validate the quality prediction accuracy based on the provided scores. The Pearson correlation coefficients obtained stand for promising results for different types of videos.
Źródło:: Journal of Telecommunications and Information Technology; 2016, 1; 22-28
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:: DAB vs DAB+ Radio Broadcasting : a Subjective Comparative Study
Autorzy:: Gilski, P.
Powiązania:: https://bibliotekanauki.pl/articles/176838.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: audio quality assessment
broadcasting
DAB+
digital audio broadcasting
QoE
quality of experience
QoS
quality of service
radio communication
Opis:: In the age of digital media, delivering high quality content to consumers is one of the most demanding tasks. There exist numerous broadcasting standards, with different pros and cons, and the DAB/DAB+ (Digital Audio Broadcasting) system is one of the most popular among them. From an engineer’s perspective, efficient resource management under limited bandwidth conditions has always been a challenge. In this paper a subjective quality assessment study of the DAB and DAB+ broadcasting system is performer on a representative group of signal samples. It describes the radio link, including a fully functional transmitter designed for the purpose of this test, as well as the receiver side representing a commercially available consumer device, for a truly real-time and end-to-end quality evaluation.
Źródło:: Archives of Acoustics; 2017, 42, 4; 715-723
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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