Methods for Quality Assessment in Enterprise VoIP Communications

2013 ◽  
pp. 154-170
Author(s):  
Filipe Neves ◽  
Salviano Soares ◽  
Pedro Assunção ◽  
Filipe Tavares ◽  
Simão Cardeal
Keyword(s):  
Quality Assessment ◽  
Quality Evaluation ◽  
Voice Quality ◽  
Development Project ◽  
Successful Implementation ◽  
International Telecommunication Union ◽  
International Telecommunication ◽  
Voice Communications ◽  
Methodological Aspects ◽  
Networking Technology

In the last few years there has been a dramatic development in voice communications technology with a significant move towards Voice over the Internet Protocol (VoIP). However, since IP was primarily designed for best-effort networking technology, good quality conversation and intelligibility are not always guaranteed. In this chapter, the authors address the most relevant methods used to evaluate the voice quality in the communications context of modern enterprises, where VoIP is used as an emerging technology with impact in their activity. Relevant factors for service providers and enterprises using VoIP technology are described, such as those related to the measurement of intelligibility and with impact on the overall voice communications quality. In addition, the most important voice quality evaluation methods recommended by the International Telecommunication Union (ITU) are presented in this chapter, along with the main features that can be used to improve voice communications. Fundamental concepts behind voice quality evaluation models are highlighted, such as intrusive, non-intrusive, objective, subjective, and parametric methods. After addressing the most relevant theoretical and methodological aspects, a recent application of voice quality monitoring for VoIP communications is described as the result of a research and development project. After its successful implementation, this monitoring system is now fully operational and integrated in voice quality assessment equipment currently in the market.

scholarly journals Quality assessment of brands of erythromycin stearate tablets marketed in Abuja, Nigeria

2020 ◽  
Vol 17 (1) ◽  
pp. 29-33
Author(s):  
Kudirat B. Mustapha ◽  
Marlene D. Ekpo ◽  
Isa H. Galadima ◽  
Rukaiyatu A. Kirim ◽  
Olubukola A. Odeniran ◽  
...  
Keyword(s):  
Quality Assessment ◽  
Quality Evaluation ◽  
Hardness Test ◽  
Spectrophotometric Analysis ◽  
Assessment Study ◽  
Uniformity Test ◽  
Quality Assessment Study ◽  
Percentage Weight ◽  
Pharmaceutical Industries ◽  
Erythromycin Stearate

Erythromycin is one of the most frequently prescribed antibiotics. With the increasing number of pharmaceutical industries, the possibility of  purchasing a substandard product is on the high side. This makes it necessary to subject various commercially produced brands of erythromycin to quality evaluation in order to ascertain the quality. In this quality assessment study, six (6) brands of erythromycin tablets were subjected to physicochemical assay using standard physical methods and UV/VIS spectrophotometric analysis at 480 nm. The calibration curve for reference erythromycin was linear over a concentration range of 10-100 μg/ml with a correlation coefficient (R2) of 0.999. All the brands had standard deviation of weight greater than ±5 for the weight uniformity test. 66.67% of the brands passed the test for content of active ingredient. 83.33% of the brands examined passed the hardness test. All the brands failed the friability test because the percentage weight loss are greater than 1% as specified in the official book. Keywords: Erythromycin stearate; Tablets; Brands; Pharmaceutical Industries

scholarly journals The graph neural networking challenge

2021 ◽  
Vol 51 (3) ◽  
pp. 9-16
Author(s):  
José Suárez-Varela ◽  
Miquel Ferriol-Galmés ◽  
Albert López ◽  
Paul Almasan ◽  
Guillermo Bernárdez ◽  
...  
Keyword(s):  
Machine Learning ◽  
Computer Networks ◽  
Real World ◽  
Large Scale ◽  
Lessons Learned ◽  
Educational Resources ◽  
Global Competition ◽  
International Telecommunication Union ◽  
International Telecommunication ◽  
Broad Audience

During the last decade, Machine Learning (ML) has increasingly become a hot topic in the field of Computer Networks and is expected to be gradually adopted for a plethora of control, monitoring and management tasks in real-world deployments. This poses the need to count on new generations of students, researchers and practitioners with a solid background in ML applied to networks. During 2020, the International Telecommunication Union (ITU) has organized the "ITU AI/ML in 5G challenge", an open global competition that has introduced to a broad audience some of the current main challenges in ML for networks. This large-scale initiative has gathered 23 different challenges proposed by network operators, equipment manufacturers and academia, and has attracted a total of 1300+ participants from 60+ countries. This paper narrates our experience organizing one of the proposed challenges: the "Graph Neural Networking Challenge 2020". We describe the problem presented to participants, the tools and resources provided, some organization aspects and participation statistics, an outline of the top-3 awarded solutions, and a summary with some lessons learned during all this journey. As a result, this challenge leaves a curated set of educational resources openly available to anyone interested in the topic.

Voice Quality Evaluation Platform for the Arabic Language

2021 ◽  
Author(s):  
Aissa Amrouche ◽  
Khadidja Nesrine Boubakeur ◽  
Youssouf Bentrcia ◽  
Kamel Ferrat ◽  
Ahcene Abed ◽  
...  
Keyword(s):  
Quality Evaluation ◽  
Voice Quality ◽  
Arabic Language ◽  
Evaluation Platform

scholarly journals A line-of-sight channel model for the 100–450 gigahertz frequency band

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Joonas Kokkoniemi ◽  
Janne Lehtomäki ◽  
Markku Juntti
Keyword(s):  
Channel Model ◽  
Full Range ◽  
Line Of Sight ◽  
Absorption Loss ◽  
Radio Communication ◽  
International Telecommunication Union ◽  
International Telecommunication ◽  
Fifth Generation ◽  
Proposed Model ◽  
Actual Response

AbstractThis paper documents a simple parametric polynomial line-of-sight channel model for 100–450 GHz band. The band comprises two popular beyond fifth generation (B5G) frequency bands, namely, the D band (110–170 GHz) and the low-THz band (around 275–325 GHz). The main focus herein is to derive a simple, compact, and accurate molecular absorption loss model for the 100–450 GHz band. The derived model relies on simple absorption line shape functions that are fitted to the actual response given by complex but exact database approach. The model is also reducible for particular sub-bands within the full range of 100–450 GHz, further simplifying the absorption loss estimate. The proposed model is shown to be very accurate by benchmarking it against the exact response and the similar models given by International Telecommunication Union Radio Communication Sector. The loss is shown to be within ±2 dBs from the exact response for one kilometer link in highly humid environment. Therefore, its accuracy is even much better in the case of usually considered shorter range future B5G wireless systems.

The importance of phase on voice quality assessment

2014 ◽  
Author(s):  
Maria Koutsogiannaki ◽  
Olympia Simantiraki ◽  
Gilles Degottex ◽  
Yannis Stylianou
Keyword(s):  
Quality Assessment ◽  
Voice Quality

THE ROLE OF HARMONIZATION OF ACTIVITIES TO IMPROVE THE RATING OF RUSSIA IN THE INTERNATIONAL STATISTICAL COMPARISONS IN TELECOMMUNICATIONS AND ICT

2020 ◽  
Author(s):  
Н.П. РЕЗНИКОВА ◽  
Г.С. АРТЕМЬЕВА ◽  
Д.В. КАЛЮГА
Keyword(s):  
Sustainable Development ◽  
Sustainable Development Goals ◽  
International Telecommunication Union ◽  
The Sustainable Development ◽  
International Telecommunication ◽  
Development Goals ◽  
The Russian Federation ◽  
Ict Development ◽  
The Impact

Представлены основные направления для поиска путей улучшения рейтинга Российской Федерации в международных статистических сопоставлениях в сфере электросвязи/ИКТ с учетом необходимости гармонизации разнообразных направлений деятельности, связанных с оценкой влияния электросвязи/ИКТ на достижение Целей устойчивого развития, а также с появлением Нового индекса Международного союза электросвязи (МСЭ) взамен Индекса развития ИКТ(IDI). OThe main directions for finding ways to improve the rating of the Russian Federation in international statistical comparisons in the field of telecommunications/ICT are presented, taking into account the need to harmonize various activities related to assessing the impact of telecommunications/ICTs on achieving the sustainable development goals, as well as the advent of the new International Telecommunication Union Index instead of the ICT Development Index (IDI).

Based on Estimation of the Ionospheric Characteristics HF Frequency Prediction Method

2012 ◽  
Vol 190-191 ◽  
pp. 936-939
Author(s):  
Chao Li ◽  
Yun Jiang Liu ◽  
Heng Yang Zhang ◽  
Xiao Peng Yang ◽  
Feng Wang
Keyword(s):  
Calculation Method ◽  
Prediction Method ◽  
Engineering Calculation ◽  
International Telecommunication Union ◽  
International Telecommunication ◽  
Time Availability ◽  
Hf Channel

To grasp Complex characteristics of shortwave (HF) channel is the key and difficulty to research HF communication. On the premise of comprehending the ionosphere prediction method in the Asia Oceania region, HF frequency prediction method recommended by the International Telecommunication Union (ITU) is improved in this paper, and the engineering calculation method of predicting HF frequency in the Asia Oceania region is concluded and summarized. Comparing with the ITS (the Institute for Telecommunication Science) software’s predicting result, the method is improved to some extent in time availability and SNR in the receiving point.

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