Relevant bibliographies by topics / Mean Opinion Score

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Mean Opinion Score'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 January 2023

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Journal articles on the topic "Mean Opinion Score"

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Barazzetta, Massimo, Michele Colombo, Luca Bastianelli, Franco Moglie, Valter Mariani Primiani, Riccardo Diamanti, and Davide Micheli. "Testing of VoLTE mean opinion score in reverberation chambers." IET Science, Measurement & Technology 14, no. 8 (October 1, 2020): 949–54. http://dx.doi.org/10.1049/iet-smt.2019.0385.

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A. El-Saleh, Ayman, Abdulraqeb Alhammadi, Ibraheem Shayea, Azizul Azizan, and Wan Haslina Hassan. "Mean Opinion Score Estimation for Mobile Broadband Networks Using Bayesian Networks." Computers, Materials & Continua 72, no. 3 (2022): 4571–87. http://dx.doi.org/10.32604/cmc.2022.024642.

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Streijl, Robert C., Stefan Winkler, and David S. Hands. "Mean opinion score (MOS) revisited: methods and applications, limitations and alternatives." Multimedia Systems 22, no. 2 (December 28, 2014): 213–27. http://dx.doi.org/10.1007/s00530-014-0446-1.

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Demirsoy, Nilüfer, Hülya Öztürk, and Nurdan Ergün Acar. "A Cross-Sectional Study: Patient Privacy According to Doctors and Nurses." Nursing Science Quarterly 34, no. 2 (March 22, 2021): 114–22. http://dx.doi.org/10.1177/0894318420987171.

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Confidentiality is fundamental in building trust between patients and healthcare professionals. This research aims at presenting healthcare professionals’ opinions on patient privacy, using a 5-point Likert-type scale titled “Opinion of the Healthcare Professionals on Patient Privacy,” and 262 physicians’ and 231 nurses’ opinions were evaluated. Results showed that nurses and doctors working at emergency services got higher mean scores than those working at other units. Results revealed that doctors had the highest mean score for the item “ It is important that the patient’s body is not seen by other patients and professionals during the treatment,” while nurses had the highest mean score for the item “ I approach with due care to protect privacy in the work environment.” Results of this work highlight that patient’s right to privacy constitutes one of the most significant issues to be noted by healthcare professionals.
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Kumar, Basant, S. P. Singh, Anand Mohan, and Animesh Anand. "Performance of Quality Metrics for Compressed Medical Images Through Mean Opinion Score Prediction." Journal of Medical Imaging and Health Informatics 2, no. 2 (June 1, 2012): 188–94. http://dx.doi.org/10.1166/jmihi.2012.1083.

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Tiotsop, Lohic Fotio, Tomas Mizdos, Miroslav Uhrina, Peter Pocta, Marcus Barkowsky, and Enrico Masala. "Predicting Single Observer’s Votes from Objective Measures using Neural Networks." Electronic Imaging 2020, no. 11 (January 26, 2020): 130–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.11.hvei-130.

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The last decades witnessed an increasing number of works aiming at proposing objective measures for media quality assessment, i.e. determining an estimation of the mean opinion score (MOS) of human observers. In this contribution, we investigate a possibility of modeling and predicting single observer’s opinion scores rather than the MOS. More precisely, we attempt to approximate the choice of one single observer by designing a neural network (NN) that is expected to mimic that observer behavior in terms of visual quality perception. Once such NNs (one for each observer) are trained they can be looked at as “virtual observers” as they take as an input information about a sequence and they output the score that the related observer would have given after watching that sequence. This new approach allows to automatically get different opinions regarding the perceived visual quality of a sequence whose quality is under investigation and thus estimate not only the MOS but also a number of other statistical indexes such as, for instance, the standard deviation of the opinions. Large numerical experiments are performed to provide further insight into a suitability of the approach.
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Pritha, R. Thamil, and Dr T. Menakadevi. "Mean Opinion Score Based Handover Protocol with Particle Swarm Optimization for Multi Objective Constraints." IOSR Journal of Electronics and Communication Engineering 9, no. 2 (2014): 31–40. http://dx.doi.org/10.9790/2834-09223140.

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Yashwant, Aniruddh V., Balamani Arayambath, Vikneshan Murugaboopathy, Pradeep Babu Kommi, Karthikshree V. Prashad, and U. B. Rajasekaran. "Comparative Evaluation of the Effectiveness of Blended Learning Versus Traditional Learning in Cephalometrics for Undergraduates." Journal of Indian Orthodontic Society 54, no. 1 (January 2020): 24–30. http://dx.doi.org/10.1177/0301574219883873.

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Objective: To compare the effectiveness of blended learning versus traditional learning in a cephalometric learning module for undergraduates. Materials and methods: This study was designed as a pre- and posttest trial. 150 undergraduates were randomly allocated to two groups: group 1 for traditional learning, and group 2, for blended learning. Pretest and posttest scores of both groups of 25 MCQs on cephalometrics were obtained. Feedback was obtained from the participants in this study and analyzed. Results: In group 1, the mean pretest and posttest scores were 13.87 and 16.10, respectively. In group 2, the mean value for the pretest and posttest scores were 14.01 and 22.18, respectively. The mean improvement in knowledge score was significantly higher in group 1 (2.233) compared to the mean score of group 2 (8.171). The level of statistical significance was P < .001. Feedback analysis showed the participants found the experience with Dolphin software better than traditional learning (Dolphin Cephalometric Imaging and Management software [version 11.8.24 Chatsworth,CA,USA]). For over 50% participants, their overall opinion on the cephalometric module was very good (score = 5). Conclusion: Blended learning increases the effectiveness of cephalometric learning by means of better student performance. Commercially available Cephalometric software can be used for e-learning instead of a specifically designed learning software.
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Yadav, Renu, Soumitra Mukhopadhyay, and Subodh Kumar Yadav. "EVALUATION OF TUTOR PERFORMANCE IN PROBLEM BASED LEARNING: RATING THE SKILL ON STUDENTS PERSPECTIVE." Journal of Chitwan Medical College 10, no. 4 (December 16, 2020): 96–99. http://dx.doi.org/10.54530/jcmc.180.

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Background: The Problem based learning (PBL) was developed at McMaster University School of Medicine in Canada in the 1960s. It has become today’s most accepted method of teaching and learning activities in the field of medicine. A skilled and well-trained tutor plays major role in PBL. Present study is aimed to evaluate tutor performance on student’s perspective based on questionnaire. Methods: This questionnaire-based study was conducted with MBBS I (n=100) and II (n=100) year students of Nobel Medical College and Teaching Hospital. Tutors performance evaluation form was prepared provided with nine question items and the responses were limited to likert scale (1=strongly disagree, 2=disagree, 3=uncertain, 4=agree and 5=strongly agree). Students were in­structed to give their opinion and total percentage score along with mean score of every question items were obtained. Then, mean score of each questions were compared between both MBBS batches. Results: Performance of tutors in problem-based learning sessions were analyzed which were ob­tained as Likert scale score; the percentage score 4 (agree, MBBS I= 52.11 %, MBBS II=53.55 %) followed by 5 (strongly agree, MBBS I=20.77 %, MBBS II= 32.22 %). Mean score obtained for each question items were compared between MBBS I and II year which significantly vary though the majority of scores were 4 (agree) and 5(strongly agree). Conclusions: Satisfactory tutor performance was procured on evaluating the tutor for their skill in PBL as facilitator based on student’s opinion.
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Imsa-ard, Pariwat. "Reading Better?: Enhancing Thai EFL Secondary School Students&#39; Reading Comprehension Abilities with the Use of Graphic Organizers." English Language Teaching 15, no. 5 (March 30, 2022): 1. http://dx.doi.org/10.5539/elt.v15n5p1.

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The purpose of this study is to examine the effectiveness of utilizing graphic organizers to enhance Thai EFL students&#39; reading comprehension abilities and their opinions regarding using graphic organizers for reading comprehension. To gather information from sixty-four upper secondary school students at a public school in Bangkok, this research study used 1) instructional instruments: ten reading passages from a coursebook and ten graphic organizers designed by the researcher; and 2) research instruments: two English reading comprehension tests with multiple-choice, true/false, and short-answer questions, and focus-group interviews about students&#39; opinions toward English reading instruction using graphic organizers. The data were analyzed using descriptive statistics, including mean scores, normalized gains, standard deviations, and inferential statistics, namely the dependent t-test and Cohen&rsquo;s d. The results indicated that the mean score on the reading comprehension post-test was significantly higher than the mean score on the pre-test at the 0.05 level of significance, and the experimental group acquired a higher score (M=87.00, SD=10.55) than the control group (M=51.18, SD=12.127) with the effect size of .846. Students exhibited a favorable opinion toward English reading instruction employing graphic organizers; and the average normalized gain was in the high gain range, g&gt; = 0.78. Additionally, this research established that English reading instruction employing graphic organizers benefited students with low reading abilities and improved their abilities to comprehend what they read. The findings of this study provide potential avenues for improving students&#39; reading comprehension. &nbsp;
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Dissertations / Theses on the topic "Mean Opinion Score"

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Barison, Dherik. "Avaliação da qualidade de chamadas VoIP cifradas usando Mean opinion score e Traffic control." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259456.

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Orientador: Leonardo de Souza Mendes
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-17T15:12:52Z (GMT). No. of bitstreams: 1 Barison_Dherik_M.pdf: 8956445 bytes, checksum: 9549370d08573863a0f2bab25d076945 (MD5) Previous issue date: 2010
Resumo: A proposta desta dissertação é avaliar a qualidade de chamadas VoIP cifradas com diferentes algoritmos de criptografia através do OpenVPN, com o objetivo de identificar as diferenças de resultados entre os algoritmos de criptografia e também entre as chamadas cifradas e as não cifradas. Esta avaliação ocorrerá utilizando o MOS (Mean Opinion Score), um método que permite indicar a satisfação do usuário quanto a qualidade da comunicação. As chamadas VoIP cifradas irão ocorrer em diferentes cenários de rede que apresentam diversos problemas, tais como perda de pacotes, pacotes fora de seqüência, atraso, largura de banda de rede, etc. Estes cenários foram baseados em algumas situações reais de uso e serão emulados através da ferramenta Traffic Control do Linux, capaz de manipular os pacotes enviados por qualquer uma das interfaces de rede. Os cenários também terão diferentes larguras de banda de rede, para avaliar a influência das mesmas em algumas situações.
Abstract: The purpose of this work is to evaluate the quality of encrypted VoIP calls with different cipher algorithms through OpenVPN software, in order to identify differences in results between encryption algorithms and also differences between non-encrypted and encrypted calls. This evaluation will do by the MOS (Mean Opinion Score), a method to indicate user satisfaction of communication quality. The encrypted VoIP calls will occur in different network scenarios that present different problems, like packet loss, out-of-order packets, delay, network bandwidths, etc. These scenarios were based on some real situations of use and will be emulated with the Traffic Control tool from Linux, able of handling the packages sent by any available network interface. The scenarios will also have different network bandwidths to assess its importance in some situations.
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
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Darisipudi, Veeravenkata Naga S. Maniteja. "Sustainable Throughput – QoE Perspective." Thesis, Blekinge Tekniska Högskola, Institutionen för kommunikationssystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-14044.

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In recent years, there has been a significant increase in the demand for streaming of high quality videos on the smart mobile phones. In order to meet the user quality requirements, it is important to maintain the end user quality while taking the resource consumption into consideration. This demand caught the attention of the research communities and network providers to prioritize Quality of Experience (QoE) in addition to the Quality of Service (QoS). In order to meet the users’ expectations, the QoE studies have gained utmost importance, thus creating the challenge of evaluating it in such a way that the quality, cost and energy consumption are taken into account. This gave way to the concept of QoE-aware sustainable throughput, which denotes the maximal throughput at which QoE problems can be still kept at a desired level. The aim of the thesis is to determine the sustainable throughput values from the QoE perspective. The values are observed for different delay and packet loss values in wireless and mobile scenarios. The evaluation is done using the subjective video quality assessment method. In the subjective assessment method, the evaluation is done using the ITU-T recommended Absolute Category Rating (ACR). The video quality ratings are taken from the users, and are then averaged to obtain the Mean Opinion Score (MOS). The obtained scores are used for analysis in determining the sustainable throughput values from the users’ perspective. From the results it is determined that, for all the video test cases, the videos are rated better quality at low packet loss values and low delay values. The quality of the videos with the presence of delay is rated high compared to the video quality in the case of packet loss. It was observed that the high resolution videos are feeble in the presence of higher disturbances i.e. high packet loss and larger delays. From considering all the cases, it can be observed that the QoE disturbances due to the delivery issues is at an acceptable minimum for the 360px video. Hence, the 480x360 video is the threshold to sustain the video quality.
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ITAKURA, Fumitada, Kazuya TAKEDA, Katsunobu ITOU, and Weifeng LI. "Single-Channel Multiple Regression for In-Car Speech Enhancement." Institute of Electronics, Information and Communication Engineers, 2006. http://hdl.handle.net/2237/15051.

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Zhen, Zuguang. "The effect of mobile cellular network performance and contextual factors on smartphone users’ satisfaction : A study on QoE evaluation for YouTube video streaming via CrowdSourcing." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177566.

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Mobile data traffic will continue to show rapid growth in the coming years; however the data revenue is not rising fast enough to ensure the operators’ profitability. Therefore, mobile operators must seek new approaches to find out what service does the customers need and what quality makes the customers satisfied in order to keep their increasingly sophisticated customers satisfied at the same time minimizing their revenue gap. This paper investigate the effect of mobile cellular network performance and contextual factors on smartphone users’ satisfaction, this was done via crowdsourcing through an experiment where an Android Application and a user Survey were included, which is able to evaluate and analyze the perceived quality of experience (QoE) for YouTube service for Android Smartphone users. To achieve this goal, the App NPT performs measurements of objective quality of service (QoS) parameters, whereas the survey carriers out collecting subjective user opinion. The result show that network performance parameters do impact the MOS (Mean Opinion Score) exponentially, either in a positively or negatively way, however, multiple parameters need to be considered together in order to draw a more accurate correlation with QoE. In addition, QoE are heavily affected by many other contextual factors, such as age and gender as well as users location. QoE are also impacted by several subjective factors, such as user expectation. Not always the highest throughput will lead to the best QoE, and not always the best technology (LTE) deserves the best MOS. Even though user received very high downlink throughput, their MOS value may still be low due to they might think the video were not fun to watch and the quality has not meet their expectation.
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Varisetty, Tilak, and Praveen Edara. "Systematic Overview of Savings versus Quality for H.264/SVC." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2455.

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The demand for efficient video coding techniques has increased in the recent past, resulting in the evolution of various video compression techniques. SVC (Scalable video coding) is the recent amendment of H.264/AVC (Advanced Video Coding), which adds a new dimension by providing the possibility of encoding a video stream into a combination of different sub streams that are scalable in areas corresponding to spatial resolution, temporal resolution and quality. Introduction of the scalability aspect is an effective video coding technique in a network scenario where the client can decode the sub stream depending on the available bandwidth in the network. A graceful degradation in the video quality is expected when any of the spatial, temporal or the quality layer is removed. Still the amount of degradation in video quality has to be measured in terms of Quality of Experience (QoE) from the user’s perspective. To measure the degradation in video quality, video streams consisting of different spatial and temporal layers have been extracted and efforts have been put to remove each layer starting from a higher dependency layer or the Enhancement layer and ending up with the lowest dependency layer or the Base layer. Extraction of a temporally downsampled layer had challenges with frame interpolation and to overcome this, temporal interpolation was employed. Similarly, a spatial downsampled layer has been upsampled in the spatial domain in order to compare with the original stream. Later, an objective video quality assessment has been made by comparing the extracted substream containing fewer layers that are downsampled both spatially and temporally with the original stream containing all layers. The Mean Opinion Scores (MOS) were obtained from objective tool named Perceptual Evaluation of Video Quality (PEVQ). The experiment is carried out for each layers and also for different test videos. Subjective tests were also performed to evaluate the user experience. The results provide recommendations to SVC capable router about the video quality available for each layer and hence the network transcoder can transmit a specific layer depending on the network conditions and capabilities of the decoding device.
Efterfrågan på effektiva video kodningstekniker har ökat under de senaste åren, vilket resulterar i utvecklingen av olika tekniker videokomprimering. SVC (Scalable Video Coding) är den senaste ändringen av H.264/AVC (Advanced Video Coding), vilket ger en ny dimension genom att möjligheten att koda en videoström till en kombination av olika sub strömmar som är skalbara i områden som motsvarar rumslig upplösning, tidsupplösning och kvalitet. Introduktion av skalbarhet aspekten är en effektiv video kodningsteknik i ett nätverk scenario där kunden kan avkoda sub strömmen beroende på den tillgängliga bandbredden i nätverket. En elegant nedbrytning i videokvaliteten förväntas när någon av den rumsliga, tidsmässiga eller kvaliteten skiktet avlägsnas. Fortfarande mängden nedbrytning i videokvalitet måste mätas i termer "Quality of Experience" (QoE) från användarens perspektiv. För att mäta försämring i video-kvalitet, har videoströmmar består av olika rumsliga och tidsmässiga skikt hämtats och ansträngningar har lagts för att ta bort varje lager från ett högre beroende lager eller förbättrande lagret och slutar upp med den lägsta beroendet lagret eller basen skikt. Extraktion av ett tidsmässigt nedsamplas lager hade problem med ram interpolation och för att övervinna detta, var temporal interpolering används. På liknande sätt har en rumslig nedsamplas skikt har uppsamplas i rumsdomänen för att jämföra med den ursprungliga strömmen. Senare har en objektiv videokvalitet bedömning gjorts genom att jämföra den extraherade underströmmen med färre lager som nedsamplade både rumsligt och tidsmässigt med den ursprungliga strömmen innehållande alla lager. De genomsnittliga yttrande poäng (MOS) erhölls från objektivt verktyg som heter Perceptuell utvärdering av Videokvalitet (PEVQ). Experimentet utförs för varje skikt och även för olika test video. Subjektiva tester utfördes också för att utvärdera användarupplevelsen. Resultaten ger rekommendationer till SVC kapabel router om videokvaliteten för varje lager och därmed nätverket kodomvandlaren kan överföra ett visst lager beroende på nätverksförhållanden och kapacitet avkodnings anordningen.
Tilak Varisetty, 518, Gamlainfartsvägen, Annebo, Karlskrona -37141, Mobil: 0723060131
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Diallo, Mamadou Tourad. "Quality of experience and video services adaptation." Thesis, Evry, Institut national des télécommunications, 2015. http://www.theses.fr/2015TELE0010/document.

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Avec l'hétérogénéité des réseaux et la demande croissante de services multimédias, la Qualité d'Expérience (QoE) devient un facteur déterminant de réussite ou d’échec de ces services. Dans cette thèse, nous avons d’abord analysé l'impact des paramètres de qualité sur l'engagement de l'utilisateur, afin de comprendre l’effet des paramètres vidéo (temps de démarrage, qualité intrinsèque, taux de blocage) et la popularité du service sur l'engagement de l'utilisateur. Nos résultats ont montré que le taux de blocage et la popularité du service sont des paramètres critiques qui impactent fortement la satisfaction et l'engagement de l’utilisateur, tandis que, le temps de démarrage a moins d’impact. Ensuite, les approches subjectives de QoE comme le Mean Opinion Score (MOS) ont été traité dans cette thèse, où les utilisateurs sont appelés à donner une note de satisfaction en fonction des informations de contextes. Une analyse statistique des résultats obtenus à partir de tests utilisateurs a montré que le type de terminal et de contenu sont des paramètres qui impactent fortement le MOS. En plus, des modèles mathématiques d’estimation de QoE en fonction des informations de contextes ont été proposés. Enfin, deux techniques d’optimisations ont été proposées : Le MDASH (MOS Dynamic Adaptive Streaming over HTTP) pour l’optimisation vidéo de flux partageant les mêmes ressources, de manière à garantir une certaine QoE pour tous les utilisateurs. Et une optimisation de livraison, basée sur des fonctions d’utilités dans laquelle, une fonction globale d'utilité est calculée en fonction de différentes contraintes (qui dépendent fortement des stratégies des acteurs de la chaîne de livraison)
With the network heterogeneity and increasing demand of multimedia services, Quality of Experience (QoE) becomes a crucial determinant of the success or failure of these services. In this thesis, we first propose to analyze the impact of quality metrics on user engagement, in order to understand the effects of video metrics (video startup time, average bitrate, buffering ratio) and content popularity on user engagement. Our results show that video buffering and content popularity are critical parameters which strongly impacts the end-user’s satisfaction and user engagement, while the video startup time appears as less significant. On other hand, we consider subjective approaches such as the Mean Opinion Score (MOS) for evaluating QoE, in which users are required to give their assessment according to contextual information. A detailed statistical analysis of our study shows the existence of non-trivial parameters impacting MOS (the type of device and the content type). We propose mathematical models to develop functional relationships between the QoE and the context information which in turn permits us to estimate the QoE. A video content optimization technique called MDASH (for MOS Dynamic Adaptive Streaming over HTTP) is proposed, which improves the perceived QoE for different video sessions sharing the same local network, while taking QoE fairness among users as a leitmotiv. We also propose a utility-based approach for video delivery optimization, in which a global utility function is computed based on different constraints (e.g. target strategies coming from the actors of the delivery chain)
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Aziz, Hussein. "Streaming Video over Unreliable and Bandwidth Limited Networks." Doctoral thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00560.

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The main objective of this thesis is to provide a smooth video playout on the mobile device over wireless networks. The parameters that specify the wireless channel include: bandwidth variation, frame losses, and outage time. These parameters may affect the quality of the video negatively, and the mobile users may notice sudden stops during the playout video, i.e., the picture is momentarily frozen, followed by a jump from one scene to a different one. This thesis focuses on eliminating frozen pictures and reducing the amount of video data that need to be transmitted. In order to eliminate frozen scenes on the mobile screen, we propose three different techniques. In the first technique, the video frames are split into sub-frames; these sub-frames are streamed over different channels. In the second technique the sub-frames will be “crossed” and sent together with other sub-frames that are from different positions in the streaming video sequence. If some sub-frames are lost during the transmission a reconstruction mechanism will be applied on the mobile device to recreate the missing sub-frames. In the third technique, we propose a Time Interleaving Robust Streaming (TIRS) technique to stream the video frames in different order. The benefit of that is to avoid losing a sequence of neighbouring frames. A missing frame from the streaming video will be reconstructed based on the surrounding frames on the mobile device. In order to reduce the amount of video data that are streamed over limited bandwidth channels, we propose two different techniques. These two techniques are based on identifying and extracting a high motion region of the video frames. We call this the Region Of Interest (ROI); the other parts of the video frames are called the non-Region Of Interest (non-ROI). The ROI is transmitted with high quality, whereas the non-ROI is interpolated from a number of references frames. In the first technique the ROI is a fixed size region; we considered four different types of ROI and three different scenarios. The scenarios are based on the position of the reference frames in the streaming frame sequence. In the second technique the ROI is identified based on the motion in the video frames, therefore the size, position, and shape of the ROI will be different from one video to another according to the video characteristic. The videos are coded using ffmpeg to study the effect of the proposed techniques on the encoding size. Subjective and objective metrics are used to measure the quality level of the reconstructed videos that are obtained from the proposed techniques. Mean Opinion Score (MOS) measurements are used as a subjective metric based on human opinions, while for objective metric the Structural Similarity (SSIM) index is used to compare the similarity between the original frames and the reconstructed frames.
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Adebomi, OYEKANLU Emmanuel, and JOHN Samson Mwela. "Impact of Packet Losses on the Quality of Video Streaming." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4098.

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In this thesis, the impact of packet losses on the quality of received videos sent across a network that exhibit normal network perturbations such as jitters, delays, packet drops etc has been examined. Dynamic behavior of a normal network has been simulated using Linux and the Network Emulator (NetEm). Peoples’ perceptions on the quality of the received video were used in rating the qualities of several videos with differing speeds. In accordance with ITU’s guideline of using Mean Opinion Scores (MOS), the effects of packet drops were analyzed. Excel and Matlab were used as tools in analyzing the peoples’ opinions which indicates the impacts that different loss rates has on the transmitted videos. Statistical methods used for evaluation of data are mean and variance. We conclude that people have convergence of opinions when losses become extremely high on videos with highly variable scene changes
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Bílek, Petr. "Měření kvality telefonních hovorů u pobočkové ústředny Asterisk." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218970.

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This thesis contains description of the present methods and algoritms for measuring the quality of telephone call on the PBX Asterisk. Further develop the concept of a system for measuring and implementing the call embbeded system VOIPAC PXA270M. Based on theoretical analysis is carried out discussions between C, Java and PHP,which results in the selection of appropriate programming language suitable for implementation in embedded system. The concept is realized by creating an application written in a particular programming language. Part of this work is verification created application using experimental measurments of telecommunications system. The results of experimental measurements are discussed in the final evaluation.
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Ramadhani, Uri Arta. "Evaluation of the Profitability of Quality of Experience-based Resource Allocation Deployment in LTE Network : A Techno-economic Assessment based on Quality of Experience in Video Traffic." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-218073.

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In the current mobile telecommunication market, with slow growth in mobile subscriptions and increasing traffi demand, each mobile operator needs to manage their customer loyalty in order to maintain position in the market. To retain their customer's loyalty, the user quality of satisfaction needs to be preserved. Integrating a Quality of Experience (QoE) approach into a radio resource scheduling scheme can be a means to improve user quality of satisfaction to a service. However, the enhancement of existing resource allocation management to support a QoE-based resource scheduling scheme needs a careful consideration since it will impact the mobile operator's investment cost. A profitability assessment of QoE-based resource allocation is required as a basis for the mobile operator to forecast their potential benefit of QoE-based resource scheduling deployment. This thesis investigated the profitability of deploying QoE-based radio resource management (RRM) in terms of revenue loss compared to proportional fair (PF) scheduling, a widely used resource allocation scheme, in delivering a streaming video service. In QoE-based RRM, a buffering percentage experienced by a user was considered in the resource allocation decision process. The two scheduling schemes were simulated in different network configurations. User satisfaction was quantified in terms of mean opinion score. Given the degree of satisfaction for each user, a number of users who would be likely to churn was obtained. A cost-benefit assessment was then conducted by predicting revenue loss due to customer churn. The results from the simulation and cost analysis show that although QoE-based resource scheduling provides users with a higher degree of satisfaction for more base stations, the utilization of a QoE-based resource scheduler does not offer significant benefit to the network operator with regard to revenue loss and deployment cost when compared to a PF scheduler. This outcome indicates that if the business target is to reduce customer churn, then the operator should utilize a PF scheduler for their RRM scheme.
Den nuvarande mobiltelefonimarknaden kännetecknas av svag tillväxt av nya kunder men ett ökat nyttjande bland existerande kunder av företagens tjänster. Kundlojalitet har blivit en avgörande faktor för att uppnå en stark marknadsposition. Kundernas upplevda kvalitet utav mobiltjänsterna behöver upprätthållas på en hög nivå för att tillfredställa denna lojalitet. Att applicera en upplevad kvalitet (QoE) metod i en radio resurs kan vara ett medel till att förbättra kundernas upplevda kvalitet av mobiltj änsten. För att undersöka ifall en sådan tjänst är lönsam är det dock nödvändigt att en lönsamhetskalkyl genomförs, där investeringskostnad och systemets driftkostnad vägs mot eventuella intäkter. En lönsamhetsbedömning av QoE-baserad resursallokering krävs som grund för mobiloperatören att förutse deras potentiella fördelar med QoE-baserad resursschemaläggning. Denna uppsats undersöker lönsamheten av att implementera QoE i termer av förlorade intäkter, jämfört med proportionell rättvis (PF) schemaläggning, i att leverera en videoströmservice. I QoE-baserad RRM användes buffertprocentandel som användes av användarna i resursallokeringsprocessen.  De två olika systemen simulerades genom att använda olika antal basstationer i mobilnätverkskonfigurationen. Användarnöjdhet kvantifierades genom att låta användarna betygsätta tjänsten, detta värde användes därefter till att uppskatta hur många av kunderna som sannolikt ej skulle återanvända tjänsten. En lönsamhetskalkyl genomfördes genom att prediktera förlorade intäkter med avseende på kunderna som ej skulle återanvända tjänsten. Resultaten från simulerings- och lönsamhetsberäkningen visade att även om QoE erbjuder en högre kundnöjdhet av tjänsten och tillfredsställelse för er basstationer, så leder inte en QoE-implementering till signikanta fördelar för nätverket i termer av förlorade intäkter och investeringskostnader jämfört med ett PF schemaläggare. Detta indikerar att om ett företags mål är att höja kundlojaliteten, då skall företaget applicera en PF schemaläggare istället för QoE.
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Books on the topic "Mean Opinion Score"

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Keane, Adrian, and Paul McKeown. 1. Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/he/9780198811855.003.0001.

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Evidence is information by which facts tend to be proved, and the law of evidence is that body of law and discretion regulating the means by which facts may be proved in both courts of law and tribunals and arbitrations in which the strict rules of evidence apply. This introductory chapter discusses truth and the fact-finding process and explains how getting to the truth in court is hampered by practical constraints, the adversarial system, the rules of evidence themselves, and the fact that litigation is a human endeavour that necessarily provides scope for differences of opinion, error, deceit, and lies. The chapter also contains a brief history of the development of the law to date.
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Fischer, Nick. John Bond Trevor, Radicals, Eugenics, and Immigration. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252040023.003.0006.

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This chapter examines John Bond Trevor's contribution to anticommunism. Trevor is probably the only man who significantly influenced both the doctrinal evolution of anticommunism and the revolutionary immigration acts of the early 1920s. As director of the New York City branch of the US Army Military Intelligence Division (MI) during the Red Scare, Trevor directly observed and suppressed “radical” elements of the populace. His opinions about the sources of radicalism and the composition of the radical community were solicited by companion organizations, especially the Bureau of Investigation, and MI headquarters in Washington, D.C. He was also a crucial proponent of immigration restrictions as a credible and practicable means of protecting the United States from Bolshevism. This chapter first looks at the origins of Trevor before discussing his collaboration with Archibald Stevenson in forming the Lusk Committee to study the “Bolshevist movement.” It also explores how Trevor synthesized and translated the scientific theories of the eugenics movement into coherent legislation.
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Aligica, Paul Dragos, Peter J. Boettke, and Vlad Tarko. Public Governance and the Classical-Liberal Perspective. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190267032.001.0001.

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Classical liberalism entails not only a view about the proper scope of government and its relationship with the market but also a distinct theory about how government should operate within its proper area. This book presents the basic governance theory and political economy principles underpinning this vision. Building upon the works of diverse authors such as Friedrich Hayek, James Buchanan, and Vincent and Elinor Ostrom, the book offers a profound challenge to how public governance is commonly understood, by shifting the focus along several dimensions. First, it challenges the technocratic-epistocratic perspective in which social goals are set and experts simply provide the means to attain them. Instead, the focus is on the diversity of opinions in any society regarding “what should be done,” and on the design of democratic and polycentric institutions capable of limiting social conflicts and satisfying the preferences of as many people as possible. Second, the book explains the knowledge and incentive problems associated with technocratic-epistocratic governance. This has deep implications for how public governance itself should be construed. The book’s three parts reconstruct the theoretical foundations of the position, then explore its nature and development at the interface between public choice and public administration, and finally illustrate via a set of concrete governance issues how it operates at the applied level. The book thus fills a large gap in the academic literature, as well as the public discourse, about the ways decision makers understand the nature and administration of the public sector.
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Book chapters on the topic "Mean Opinion Score"

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Ostaszewska, A., and S. Żebrowska-Łucyk. "The Method of Increasing the Accuracy of Mean Opinion Score Estimation in Subjective Quality Evaluation." In Wearable and Autonomous Biomedical Devices and Systems for Smart Environment, 315–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15687-8_16.

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Nimbhore, Sunil, Suhas Mache, and Sidhharth Mache. "Feature Exratction of PTTS System and Its Evaluation by Standard Statistical Method Mean Opinion Score." In Data Engineering for Smart Systems, 423–30. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2641-8_40.

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Renzi, Cristina, and Francesco Leali. "Multicriteria Decision Making Methods in Engineering Design: An Application on Medical Devices." In Lecture Notes in Mechanical Engineering, 406–11. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_64.

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AbstractThe design of medical devices is challenging, due to strict geometry specifications and criteria belonging to several disciplines. The aim of this paper is to provide a design methodology which seems to lack in the literature of design of biomedical devices. In particular, the case study proposed in this paper concerns with the design of Bone-Biopsy (BB) needle devices. Following the design process of Pahl and Beitz, a functional analysis is carried out, to point out the interfaces between parts of existing BB needles. A morphology matrix is used to generate alternatives for the cannula holder, the core part of the product. Generated alternatives have been ranked and scored by means of the Pugh’s Controlled Convergence method according to the decision makers' opinions. In this work, the design peculiarities related to the BB needles which have been pointed out could be extended for guiding the design of other biomedical devices.
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Singh, Harman, Parminder Singh, and Manjot Kaur Gill. "Statistical Parametric Speech Synthesis for Punjabi Language using Deep Neural Network." In SCRS CONFERENCE PROCEEDINGS ON INTELLIGENT SYSTEMS, 431–41. Soft Computing Research Society, 2021. http://dx.doi.org/10.52458/978-93-91842-08-6-41.

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In recent years, speech technology gets very advanced, due to which speech synthesis becomes an interesting area of study for researchers. Text-To-Speech (TTS) system generates the speech from the text by using a synthesized technique like concatenative, formant, articulatory, Statistical Parametric Speech Synthesis (SPSS) etc. The Deep Neural Network (DNN) based SPSS for the Punjabi language is used in this research work. The database used for this research works contains 674 audio files and a single text file containing 674 sentences. This database was created at the Language Technologies Institute at Carnegie Mellon University (CMU) provided under Festvox distribution. Ossian toolkit is used as a front-end for text processing. The two DNNs are modeled using the merlin toolkit. The duration DNN maps the linguistic and duration features of speech. The acoustic DNN maps the linguistic and acoustic features. The subjective evaluation using the Mean Opinion Score (MOS) shows that this TTS system has good quality of naturalness that is 80.2%.
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Alshamrani, Mazin I., and Ashraf A. Ali. "Performance Metrics for SIP-Based VoIP Applications Over DMO." In Advances in Wireless Technologies and Telecommunication, 50–79. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2113-6.ch004.

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The evaluation studies need to investigate a determined performance metrics to understand and evaluate the examined scenarios. SIP-based Voice over IP (VoIP) applications over MANET, which behaves in a way similar to Direct Mode of Operation (DMO) in mission Critical Communication Systems, have two main performance categories related to the Quality of Service (QoS). The main performance metrics that are considered for the evaluation processes in this research are the SIP end-to-end Performance metrics as defined by the RFC 6076. The main performance metrics are related to the registration, the call setup, and the call termination processes. In this research study, the SIP performance metrics are based on a single SIP proxy server. For voice data, the QoS evaluation is based on two methods: The Objective method and the Subjective method. The Objective method considers the traffic throughput, end-to-end delays, packet loss, and jitter, while the subjective method considers the Mean Opinion Score (MOS), which is mostly related to the end users' experiences during voice calls.
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Ben Kharrat, Firas, Aymen Elkhleifi, and Rim Faiz. "Improving Collaborative Filtering Algorithms." In Natural Language Processing, 638–57. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0951-7.ch031.

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This paper puts forward a new recommendation algorithm based on semantic analysis as well as new measurements. Like Facebook, Social network is considered as one of the most well-prominent Web 2.0 applications and relevant services elaborating into functional ways for sharing opinions. Thereupon, social network web sites have since become valuable data sources for opinion mining. This paper proposes to introduce an external resource a sentiment from comments posted by users in order to anticipate recommendation and also to lessen the cold-start problem. The originality of the suggested approach means that posts are not merely characterized by an opinion score, but receive an opinion grade notion in the post instead. In general, the authors' approach has been implemented with Java and Lenskit framework. The study resulted in two real data sets, namely MovieLens and TripAdvisor, in which the authors have shown positive results. They compared their algorithm to SVD and Slope One algorithms. They have fulfilled an amelioration of 10% in precision and recall along with an improvement of 12% in RMSE and nDCG.
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Ritchie, Donald A. "Drew Pearson’s Leg Men." In The Columnist, 89–106. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190067588.003.0005.

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Filling a daily column that mixed breaking news with opinion required more news gathering than Drew Pearson could handle on his own. He augmented his reporting with “leg men,” a team of able news hunters. They lacked a byline but were compensated by their association with the nation’s most famous muckraking columnist, whose clout made them respected and feared. Operating out of half of Pearson’s Georgetown home, the leg men produced copy, scored scoops, and occasionally came under fire for questionable tactics. Among his top staff, David Karr prompted his boss to take progressive stands, but also came under fire for having Communist sympathies. Jack Anderson, who later shared the byline with Pearson and succeeded him, was more neutral in his politics but even more aggressive in digging up government secrets.
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Wujczyk, Marcin. "Rozwiązanie umowy o pracę za wypowiedzeniem z radcą prawnym a obowiązek wyrażenia opinii przez radę okręgowej izby radców prawnych." In Nauka prawa a praktyka prawnicza: Księga jubileuszowa z okazji czterdziestolecia Okręgowej Izby Radców Prawnych w Krakowie, 653–69. Ksiegarnia Akademicka Publishing, 2022. http://dx.doi.org/10.12797/9788381387736.33.

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The provisions of the Act on Legal Advisers impose an obligation on the employer to consult the Council of the District Chamber of Legal Advisers before terminating the employment contract of a attorney-at-law. The opinion should be obtained in those cases where it concerns the improper performance of obligations under the provisions of the Act on Legal Advisers. The obligation to consult the Council of the District Chamber of Legal Advisers is protective in nature. It is a means of ensuring the independence of attorneys-at-law and minimizing arbitrariness in the evaluation of their work in an area in which they require specialist knowledge. The study discusses the scope of the obligation to issue an opinion, when it is required, and the consequences of failure to comply with this requirement.
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Ng, C. Y., Kris M. Y. Law, and Andrew W. H. Ip. "Assessing Public Opinions of Products Through Sentiment Analysis." In Research Anthology on Implementing Sentiment Analysis Across Multiple Disciplines, 1422–40. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-6303-1.ch073.

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In the world of social networking, consumers tend to refer to expert comments or product reviews before making buying decisions. There is much useful information available on many social networking sites for consumers to make product comparisons. Sentiment analysis is considered appropriate for summarising the opinions. However, the sentences posted online are generally short, which sometimes contains both positive and negative word in the same post. Thus, it may not be sufficient to determine the sentiment polarity of a post by merely counting the number of sentiment words, summing up or averaging the associated scores of sentiment words. In this paper, an unsupervised learning technique, k-means, in conjunction with sentiment analysis, is proposed for assessing public opinions. The proposed approach offers the product designers a tool to promptly determine the critical design criteria for new product planning in the process of new product development by evaluating the user-generated content. The case implementation proves the applicability of the proposed approach.
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Keane, Adrian, and Paul McKeown. "1. Introduction." In The Modern Law of Evidence, 1–7. Oxford University Press, 2020. http://dx.doi.org/10.1093/he/9780198848486.003.0001.

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Evidence is information by which facts tend to be proved, and the law of evidence is that body of law and discretion regulating the means by which facts may be proved in both courts of law and tribunals and arbitrations in which the strict rules of evidence apply. This introductory chapter discusses truth and the fact-finding process and explains how getting to the truth in court is hampered by practical constraints, the adversarial system, the rules of evidence themselves, and the fact that litigation is a human endeavour that necessarily provides scope for differences of opinion, error, deceit, and lies. The chapter also contains a brief history of the development of the law to date.
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Conference papers on the topic "Mean Opinion Score"

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Gao, Yixuan, Xiongkuo Min, Yucheng Zhu, Jing Li, Xiao-Ping Zhang, and Guangtao Zhai. "Image Quality Assessment: From Mean Opinion Score to Opinion Score Distribution." In MM '22: The 30th ACM International Conference on Multimedia. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3503161.3547872.

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Ribeiro, Flavio, Dinei Florencio, Cha Zhang, and Michael Seltzer. "CROWDMOS: An approach for crowdsourcing mean opinion score studies." In ICASSP 2011 - 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2011. http://dx.doi.org/10.1109/icassp.2011.5946971.

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Kim, Chin-chol, Sang-yong Ha, Byeong-hee Roh, Jong-pil Jeong, and Jae-young Choi. "Measurement Method for Mean Opinion Score in Actual Home Environments." In The 5th International Conference on Advanced Communication and Networking. Science & Engineering Research Support soCiety, 2013. http://dx.doi.org/10.14257/astl.2013.31.04.

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Waidyanatha, Nuwan, Tharaka Wilfred, Kasun Perera, and Manoj Silva. "Mean Opinion Score performance in classifying voice-enabled emergency communication systems." In 2012 International Conference on Computer & Information Science (ICCIS). IEEE, 2012. http://dx.doi.org/10.1109/iccisci.2012.6297114.

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El Hajal, Karl, Milos Cernak, and Pablo Mainar. "MOSRA: Joint Mean Opinion Score and Room Acoustics Speech Quality Assessment." In Interspeech 2022. ISCA: ISCA, 2022. http://dx.doi.org/10.21437/interspeech.2022-10698.

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Cocker, E., F. Ghazzi, and U. Speidel. "Quality trend measurement of long-distance VoIP communication via estimated mean opinion score." In 2015 10th International Conference on Information, Communications and Signal Processing (ICICS). IEEE, 2015. http://dx.doi.org/10.1109/icics.2015.7459895.

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Molina-Garcia, Mariano, and J. I. Alonso. "Evolution of mean opinion Score due to handover events in IEEE 802.11 WLAN networks." In 2009 IEEE Radio and Wireless Symposium (RWS). IEEE, 2009. http://dx.doi.org/10.1109/rws.2009.4957322.

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Misha and Dalveer Kaur. "Improving Mean Opinion Score (MOS) of VoIP in WiMAX System by Using an Efficient Technique." In 2019 International Conference on Communication and Electronics Systems (ICCES). IEEE, 2019. http://dx.doi.org/10.1109/icces45898.2019.9002169.

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Yaseen, Alauldeen S., Alexey N. Pavlov, and Alexander E. Hramov. "Speech signal denoising with wavelet-transforms and the mean opinion score characterizing the filtering quality." In SPIE BiOS, edited by Valery V. Tuchin, Kirill V. Larin, Martin J. Leahy, and Ruikang K. Wang. SPIE, 2016. http://dx.doi.org/10.1117/12.2211384.

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Nayem, Khandokar Md, and Donald S. Williamson. "Incorporating Embedding Vectors from a Human Mean-Opinion Score Prediction Model for Monaural Speech Enhancement." In Interspeech 2021. ISCA: ISCA, 2021. http://dx.doi.org/10.21437/interspeech.2021-1844.

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Reports on the topic "Mean Opinion Score"

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Clark, A., Q. Wu, R. Schott, and G. Zorn. RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Mean Opinion Score (MOS) Metric Reporting. RFC Editor, June 2014. http://dx.doi.org/10.17487/rfc7266.

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