LVLRF: Sistema de gestión de niveles de potencia de transmisión de señal CATV [LVLRF: management system of transmission power levels of CATV signal]

2010 ◽  
Author(s):  
Michael Alejandro Rojas Giraldo ◽  
Luis Carlos Correa Ortiz
Keyword(s):  
Cable Television ◽  
Transmission Power ◽  
Cable Tv ◽  
Wide Range ◽  
Rf Signals ◽  
Different Types ◽  
La Red ◽  
Monitoring Software ◽  
Do So

Resumen En la actualidad la televisión por cable es prácticamente una necesidad que envuelve a cada una de las personas y hogares del mundo, debido a su gran variedad de contenidos de diferentes tipos, los cuales se adaptan a los gustos de cada individuo. Este proyecto pretende brindar herramientas para que las empresas de telecomunicaciones prestadoras de este tipo de servicio, puedan hacerlo con calidad. Con base en lo anterior, se ha concebido este proyecto como una solución al problema del monitoreo de los niveles de las señales de RF en el origen de los sistemas de televisión por cable, debido a que si el origen de la señal varía 1 dBm, en la red el cambio sería de entre 4 y 6 dBm, lo cual se representa como una deficiencia en la calidad de la señal. Este proyecto está basado en un circuito detector de RF el cual entrega una lectura, que es procesada por un circuito de interconexión encargado de entregarla a cualquier conexión IP, de allí es recibida por un software de monitoreo que representará gráficamente todos los datos. Palabras ClaveTelevisión por Cable, monitoreo, radiofrecuencia, nivel de señal de radiofrecuencia.   Abstract Today cable television is almost a necessity that involves each of the individuals and households worldwide, due to its wide range of content of different types, which were adapted to the tastes of each individual. This project aims to provide tools for the telecommunications providers of such service may do so with quality. Based on the foregoing, this project has been conceived as a solution to the problem of monitoring the levels of RF signals in the origin of the cable television systems, because if the source of the signal varies a dBm, change in the network would be between 4 and 6 dBm, which is represented as a deficiency in the quality of the signal. This project is based on an RF detector circuit which provides a reading which is processed by a circuit interconnection charge to deliver it to any IP connection, there is received by monitoring software that plotted all the data. Keywords Cable TV, monitoring, radiofrequency, radiofrequency signal level.

Wearable devices to support rehabilitation and social care

2016 ◽  
Vol 10 (1) ◽  
pp. 51-63 ◽  
Author(s):  
Kevin Doughty ◽  
Alistair Appleby
Keyword(s):  
Social Care ◽  
Wearable Devices ◽  
Assistive Technologies ◽  
Care Needs ◽  
Content Type ◽  
Battery Power ◽  
Wide Range ◽  
Different Types ◽  
Practical Implications

Purpose – The purpose of this paper is to provide a review of the use of wearable technologies that focuses on applications that tackle sensory and communication deficits, physical disabilities and alarm and activity monitoring. It is intended to promote the introduction of more wearable approaches to providing assistive technologies because of their benefits in utilisation and aesthetic appeal. Design/methodology/approach – The approach involves a comparison of different types of portable device in order to identify different groups that may be beneficial to different application areas. Recent advances are then considered for each area. Findings – The work demonstrates that the use of wearable AT device is increasing due to improvements in materials, battery power and connected intelligence such as smartphones. They will allow new devices to be introduced that are smaller, lighter and more usable. Practical implications – Utilisation of assistive technologies is likely to improve as wearable devices become the norm across a wide range of applications Social implications – Approaches to improving the Quality of Life of people with disabilities through an extended use of assistive technologies will be enhanced by the increased range of devices available and by their performance. Originality/value – To the best of the authors’ knowledge, this is the first review of wearable devices that has focused on the needs of people who have rehabilitation and/or social care needs. Its value lies in encouraging manufacturers and designers to use wearable approaches to solving some of the problems facing vulnerable people.

Election Forecasts in 1984: How Accurate Were They?

1985 ◽  
Vol 18 (01) ◽  
pp. 53-62 ◽  
Author(s):  
Michael S. Lewis-Beck
Keyword(s):  
Presidential Candidate ◽  
High Quality ◽  
Election Forecasting ◽  
Personal Favorite ◽  
World Series ◽  
The Poor ◽  
Wide Range ◽  
The World ◽  
Do So

One autumn out of four, election forecasting surpasses baseball as America's national pastime. Then, everyone wants to know who will win, and everyone has a guess. Now, with the ballots carefully counted, forecasters await their awards. Below, I evaluate the quality of a wide range of 1984 presidential and congressional forecasts. The evaluation proceeds from nonscientific to scientific approaches, although this distinction is sometimes blurred. To lower the level of suspense, I should say that some forecasts turned out to be quite good. By way of conclusion, I offer a set of rules for selecting a high-quality forecasting instrument.Lucky GuessesMany popular election forecasting rules take advantage of chance, which has been working in their favor. Perhaps the most famous is the World Series forecast, which says, “If the American League wins the World Series, then the Republican presidential candidate will win.” This technique was accurate from 1952 to 1976, missed in 1980, but worked again in 1984 with the victory of the Detroit Tigers. A lesser known rule of this type, which is my personal favorite, is based on the Beaujolais wine harvest. Accordingly, “If the Beaujolais vintage looks bad, then the Republican will take the presidency.” This has held post-1960, and continues to do so with the poor 1984 crop (yielding a wine too light, with little color). There are other such rules that relate more directly to the candidates themselves and, in that sense, have more verisimilitude.

scholarly journals Propuesta de Comunicación con Tecnología Óptica Pasiva en el Reparto “Carlos Manuel de Céspedes” de Bayamo, Cuba: opción de estudio para los universitarios

2017 ◽  
Vol 1 (8) ◽  
Author(s):  
Manleys Rodríguez Torres ◽  
Randy Verdecia Peña
Keyword(s):  
Access Network ◽  
University Student ◽  
Housing Sector ◽  
Power Budget ◽  
Starting Point ◽  
Wide Range ◽  
La Red ◽  
The University ◽  
Estudiantes Universitarios

El objetivo del trabajo consistió en diseñar una propuesta de comunicación para el reparto Carlos Manuel de Céspedes de Bayamo, Granma, Cuba. Para ello se tomó como campo investigativo 10 entidades y 1 061. Esta se basa en el despliegue de fibra óptica en el reparto en cuestión partiendo de la reutilización de la red de acceso existente. Dicho proyecto puede ser tomado como material de estudio por estudiantes universitarios. En la proposición de comunicación se concibe la inclusión de 9 MDU para dar servicios al sector residencial y 10 MDU para el sector empresarial, además, se incluye un splitter 1:32 y una OLT que se ubicaran en el sitio tecnológico y en el centro telefónico más cercano respectivamente. Para la marcha exitosa del trabajo se utilizaron métodos teóricos. La calidad de la propuesta de comunicación se verificó mediante el cálculo del presupuesto de potencia óptica, donde inciden las pérdidas provocadas por el equipamiento a utilizar. Se concluyó que con esta investigación se logra eliminar la demanda insatisfecha y permite que los clientes en sentido general puedan tener servicios de internet de banda ancha.  Palabras claves: Fibra óptica, sector residencial, sector empresarial, presupuesto de potencia, demanda insatisfecha, centro telefónico, sitio tecnológico   A proposal of communication with passive optic technology in the section “Carlos Manuel de Céspedes” of Bayamo, Cuba: an option of study for the university students Abstract  The objective of the work consisted in designing a communicative proposal in the section “Carlos Manuel de Cespedes”, in Bayamo, Cuba. There were taken 10 enterprises as the field researching as well as 1 061 s houses. It is based in the spread of optic fiber in that section taking as starting point the re-using of the existing access network. This project can be taken as a material fo studying the university student. In the proposal of communication it is glanced the inclution of 9 MDU to give service to the housing sector and 10 MDU for enterprises, it is also included 1:32 splitter and OLT that will be located in the technological place and in the closed telephone center. Fort he successful trend of the work there were used some theoratical methods, the quality of the proposal of communication was verified through the calculus budget of optic power, where the roduced power joint together collapse. It was concluded that with this research it is achieved to eliminated the unccessful demand it permits the overall users could have internet services wide range.  Keywords: optical fiber, housing sector, enterprise sector, power budget, unccessful demand, telephone center, technological place

Wireless Technologies

2010 ◽  
pp. 1244-1255 ◽  
Author(s):  
Simona Fabrizi
Keyword(s):  
Wireless Networks ◽  
Theoretical Explanation ◽  
Additional Cost ◽  
Apparent Paradox ◽  
Wireless Technologies ◽  
Different Types ◽  
Upgrading Strategies ◽  
Do So

Mobile Operators (MOs) in several countries are constantly challenged with the urge to further enhance the quality of their existing wireless networks, often dictated by the need to meet the newest technological standards as progress in wireless technologies is made. While the pressure to upgrade wireless networks is constantly felt by MOs in this market, it is not uncommon to observe some MOs upgrading their networks earlier than others. This article provides a theoretical explanation for this apparent paradox of why some MOs postpone the upgrading while others do not. It is shown that in the presence of different types of users - conservative versus quality-seeking - MOs may find it more profitable to adopt asymmetric upgrading strategies. Furthermore, it is argued that the incentives by some MOs not to upgrade are the largest when the share of conservative users in the market is sufficiently high, relative to the additional cost that upgrading entails. In such a case the MOs that do not upgrade their networks enjoy higher profits than the ones that do so.

scholarly journals 7.2. METHODOLOGICAL ASPECTS OF ASSESSING THE QUALITY OF BUSINESS SERVICES IN THE CONDITIONS OF THE MARKET

2020 ◽  
Author(s):  
Б.М. Джумъаев
Keyword(s):  
Literature Review ◽  
Dynamic Models ◽  
Quality Of Services ◽  
Business Services ◽  
Advantages And Disadvantages ◽  
Wide Range ◽  
Different Types ◽  
Methodological Aspects ◽  
The Relationship

В статье исследуются методологические аспекты оценки качества бизнес-услуг. Проводится литературный обзор относительно существующего инструментария оценки и измерения воспринимаемого качества услуг. Выявлены преимущества и недостатки использования различных методик оценки качества бизнес-услуг (SERVQUAL, модель расхождения качества услуги GAP и INDSERV). Выделены основные подходы оценки качества бизнес-услуг с учетом особенностей системы взаимоотношений в данном секторе и факторы, определяющие качество услуг. В статье формирование динамичных моделей качества услуг рассматривается как один из наиболее важных достижений в области развития модели оценки качества услуг. Выделяются проблемы оценки качества результатов бизнес-услуг с учетом широкой номенклатуры таких услуг и трудности нахождения общего показателя измерения качества услуг. Предлагается методика оценки качества бизнес-услуги в зависимости от наличия элементов инновации в показателях, определяющих качество бизнес-услуг. С учетом этого в статье отмечается, что показатели, определяющие наличие элементов инновации в компонентах качества бизнес-услуги, должны создаваться индивидуально для разных услуг, и во многих случаях даже для разных клиентов и разных этапов обслуживания, поскольку желаемый результат для определенной услуги может сильно различаться в зависимости от предприятий клиента и их потребностей в определенных инновационных свойствах бизнес-услуг. The article explores the methodology and models for assessing the quality of business services. It provides the literature review on existing tools for assessing and measuring perceived quality of service. The advantages and disadvantages of using various methods for assessing the quality of business services (SERVQUAL, the model of GAP and INDSERV) are identified. The main approaches to assessing the quality of business services are highlighted, taking into account the characteristics of the relationship system in this sector and the factors that determine the quality of services. In the article, the formation of dynamic models of service quality is considered as one of the most important achievements in the development of a model for assessing the quality of services. The problems of assessing the quality of the results of business services are highlighted, taking into account the wide range of such services and the difficulty of finding a common indicator of measuring the quality of services.On the bases of investigation, a methodology of assessing the quality of business services is proposed, depending on the presence of elements of innovation in indicators of quality of business services. The article notes that the indicators determining the presence of innovation elements in the quality of business services should be created individually for different types of services depending on various cases and customers and different stages of provision service, since the desired result for a particular service can vary greatly depending on the enterprises client and their needs for the innovative nature of business services.

Towards complete descriptions of the free–energy landscapes of proteins

2004 ◽  
Vol 363 (1827) ◽  
pp. 433-452 ◽  
Author(s):  
Michele Vendruscolo ◽  
Christopher M. Dobson
Keyword(s):  
Free Energy ◽  
Resonance Spectroscopy ◽  
Energy Landscapes ◽  
Native Structure ◽  
Wide Range ◽  
Protein Molecules ◽  
Different Types ◽  
Free Energy Landscapes ◽  
Dynamics Simulations ◽  
Do So

In recent years increasingly detailed information about the structures and dynamics of protein molecules has been obtained by innovative applications of experimental techniques, in particular nuclear magnetic resonance spectroscopy and protein engineering, and theoretical methods, notably molecular dynamics simulations. In this article we discuss how such approaches can be combined by incorporating a wide range of different types of experimental data as restraints in computer simulations to provide unprecedented detail about the ensembles of structures that describe proteins in a wide variety of states from the native structure to highly unfolded species. Knowledge of these ensembles is beginning to enable the complete free–energy landscapes of individual proteins to be defined at atomic resolution. This strategy has provided new insights into the mechanism by which proteins are able to fold into their native states, or by which they fail to do so and give rise to harmful aggregates that are associated with a wide range of debilitating human diseases.

scholarly journals Cognitive Privacy for Personal Clouds

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Milena Radenkovic
Keyword(s):  
Mobile Networks ◽  
Network Connectivity ◽  
Local Context ◽  
Transmission Network ◽  
Network Nodes ◽  
Privacy Leakage ◽  
Wide Range ◽  
Complex Graph ◽  
Different Types

This paper proposes a novel Cognitive Privacy (CogPriv) framework that improves privacy of data sharing between Personal Clouds for different application types and across heterogeneous networks. Depending on the behaviour of neighbouring network nodes, their estimated privacy levels, resource availability, and social network connectivity, each Personal Cloud may decide to use different transmission network for different types of data and privacy requirements. CogPriv is fully distributed, uses complex graph contacts analytics and multiple implicit novel heuristics, and combines these with smart probing to identify presence and behaviour of privacy compromising nodes in the network. Based on sensed local context and through cooperation with remote nodes in the network, CogPriv is able to transparently and on-the-fly change the network in order to avoid transmissions when privacy may be compromised. We show that CogPriv achieves higher end-to-end privacy levels compared to both noncognitive cellular network communication and state-of-the-art strategies based on privacy-aware adaptive social mobile networks routing for a range of experiment scenarios based on real-world user and network traces. CogPriv is able to adapt to varying network connectivity and maintain high quality of service while managing to keep low data exposure for a wide range of privacy leakage levels in the infrastructure.

Mutation m.3395A > G in MT-ND1 leads to variable pathologic manifestations

2020 ◽  
Vol 29 (6) ◽  
pp. 980-989
Author(s):  
Nicolás Gutiérrez Cortés ◽  
Claire Pertuiset ◽  
Elodie Dumon ◽  
Marine Börlin ◽  
Barbara Da Costa ◽  
...  
Keyword(s):  
Complex I ◽  
Mitochondrial Diseases ◽  
Mitochondrial Respiratory Chain ◽  
Functional Study ◽  
Mtdna Mutation ◽  
Wide Range ◽  
Complex I Assembly ◽  
First Time ◽  
Do So

Abstract A non-synonymous mtDNA mutation, m.3395A > G, which changes tyrosine in position 30 to cysteine in p.MT-ND1, was found in several patients with a wide range of clinical phenotypes such as deafness, diabetes and cerebellar syndrome but no Leber’s hereditary optic neuropathy. Although this mutation has already been described, its pathogenicity has not been demonstrated. Here, it was found isolated for the first time, allowing a study to investigate its pathogenicity. To do so, we constructed cybrid cell lines and carried out a functional study to assess the possible consequences of the mutation on mitochondrial bioenergetics. Results obtained demonstrated that this mutation causes an important dysfunction of the mitochondrial respiratory chain with a decrease in both activity and quantity of complex I due to a diminution of p.MT-ND1 quantity. However, no subcomplexes were found in cybrids carrying the mutation, indicating that the quality of the complex I assembly is not affected. Moreover, based on the crystal structure of p.MT-ND1 and the data found in the literature, we propose a hypothesis for the mechanism of the degradation of p.MT-ND1. Our study provides new insights into the pathophysiology of mitochondrial diseases and in particular of MT-ND1 mutations.

scholarly journals An experimental characterization of workers’ behavior and accuracy in crowdsourced tasks

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0252604
Author(s):  
Evgenia Christoforou ◽  
Antonio Fernández Anta ◽  
Angel Sánchez
Keyword(s):  
Amazon Mechanical Turk ◽  
Wrong Answer ◽  
Control Techniques ◽  
Different Types ◽  
Series Of Experiments ◽  
Time Required ◽  
Short Time ◽  
Do So

Crowdsourcing systems are evolving into a powerful tool of choice to deal with repetitive or lengthy human-based tasks. Prominent among those is Amazon Mechanical Turk, in which Human Intelligence Tasks, are posted by requesters, and afterwards selected and executed by subscribed (human) workers in the platform. Many times these HITs serve for research purposes. In this context, a very important question is how reliable the results obtained through these platforms are, in view of the limited control a requester has on the workers’ actions. Various control techniques are currently proposed but they are not free from shortcomings, and their use must be accompanied by a deeper understanding of the workers’ behavior. In this work, we attempt to interpret the workers’ behavior and reliability level in the absence of control techniques. To do so, we perform a series of experiments with 600 distinct MTurk workers, specifically designed to elicit the worker’s level of dedication to a task, according to the task’s nature and difficulty. We show that the time required by a worker to carry out a task correlates with its difficulty, and also with the quality of the outcome. We find that there are different types of workers. While some of them are willing to invest a significant amount of time to arrive at the correct answer, at the same time we observe a significant fraction of workers that reply with a wrong answer. For the latter, the difficulty of the task and the very short time they took to reply suggest that they, intentionally, did not even attempt to solve the task.

A Survey and a Preliminary Evaluation of Low-quality Content Detection Strategies: Which Attributes Are Still Relevant, Which Are Not?

2019 ◽  
Author(s):  
Júlio Resende ◽  
Igor Moraes ◽  
Nícollas Silva ◽  
Vinícius Durelli ◽  
Diego Dias ◽  
...  
Keyword(s):  
Social Networks ◽  
Online Social Networks ◽  
Information Quality ◽  
Preliminary Evaluation ◽  
Quality Detection ◽  
Wide Range ◽  
Different Types ◽  
Current Scenario ◽  
Detection Strategies

Online social networks have gone mainstream: millions of users have come to rely on the wide range of services provided by social networks. However, the ease use of social networks for communicating information also makes them particularly vulnerable to social spammers, i.e., ill-intentioned users whose main purpose is to degrade the information quality of social networks through the proliferation of different types of malicious data (e.g., social spam, malware downloads, and phishing) that are collectively called low-quality content or spams. Since Twitter is also rife with low-quality content, several researchers have devised various low-quality detection strategies that inspect tweets for the existence of spam contents. We carried out a literature survey of these low-quality detection strategies, examining which strategies are still applicable in the current scenario – taken into account that Twitter has undergone a lot of changes in the last few years. To gather some evidence of the usefulness of the attributes used by the low-quality detection strategies, we carried out a preliminary evaluation of these attributes.

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