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 CHANNEL ALLOCATION FOR WIRELESS NETWORKS BASED ON INTELLIGENT METHOD

2021 ◽  
Vol 20 (4) ◽  
pp. 32-37
Author(s):  
Dominik NEZNÍK ◽  
◽  
Ľubomír DOBOŠ
Keyword(s):  
Wireless Networks ◽  
Data Transfer ◽  
Channel Allocation ◽  
Smart Cities ◽  
Data Rates ◽  
Different Types ◽  
Fuzzy Logic Method ◽  
Network Technologies ◽  
Near Future

In this paper, will be presented actual research of the intelligent channel allocation. The intelligent channel allocation is based on combination of fuzzy logic method and game theory attributes to increase quality of link in network. The channel allocations will become an important phenomenon in different types of networks such as 5G technology, wireless networks (IEEE 802.11xx), Z-Wave, LoRa, 3G, 4G, etc. In the near future, new network technologies, Internet of Things (IoT) and Smart Cities will need to have intelligent channel allocation to prevent interference on the channels used for data transfer. These networks along with IoT are considered as promising technology, that interconnects different types of networks into one fully functional network. The aim of this paper is to present the concept of a methods for channel allocation in wireless networks, where channels work as communication medium based on IEEE 802.11xx technology. The simulations prove, that proposed method is able to provide lower interference, improve data rates and increase quality of links.

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.

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.

Demand of Wireless Network and Security in Current Research

2015 ◽  
Vol 14 (6) ◽  
pp. 5809-5813
Author(s):  
Abhishek Prabhakar ◽  
Amod Tiwari ◽  
Vinay Kumar Pathak
Keyword(s):  
Wireless Networks ◽  
Quality Of Service ◽  
Wireless Network ◽  
Network Performance ◽  
Wireless Security ◽  
Human Intervention ◽  
Unauthorized Access ◽  
Quality Of Service Parameters ◽  
Wireless Infrastructure

Wireless security is the prevention of unauthorized access to computers using wireless networks .The trends in wireless networks over the last few years is same as growth of internet. Wireless networks have reduced the human intervention for accessing data at various sites .It is achieved by replacing wired infrastructure with wireless infrastructure. Some of the key challenges in wireless networks are Signal weakening, movement, increase data rate, minimizing size and cost, security of user and QoS (Quality of service) parameters... The goal of this paper is to minimize challenges that are in way of our understanding of wireless network and wireless network performance.

Enumeration of Cryptosporidium oocysts from surface water concentrates by laser-scanning cytometry

2000 ◽  
Vol 41 (7) ◽  
pp. 197-202 ◽  
Author(s):  
F. Zanelli ◽  
B. Compagnon ◽  
J. C. Joret ◽  
M. R. de Roubin
Keyword(s):  
Surface Water ◽  
Water Samples ◽  
Laser Scanning ◽  
Immunomagnetic Separation ◽  
Entire Surface ◽  
Cryptosporidium Oocysts ◽  
Different Types ◽  
Laser Scanning Cytometry ◽  
Direct Microscopic Observation

The utilization of the ChemScan® RDI was tested for different types of water concentrates. Concentrates were prepared by cartridge filtration or flocculation, and analysed either without purification, or after Immunomagnetic separation (IMS) or flotation on percoll-sucrose gradients. Theenumeration of the oocysts was subsequently performed using the ChemScan® RDI Cryptosporidium application. Enumeration by direct microscopic observation of the entire surface of the membrane was carried out as a control, and recoveries were calculated as a ratio between the ChemScan® RDI result and the result obtained with direct microscopic enumeration. The Chemscan enumeration technique proved reliable, with recoveries yielding close to 100% in most cases (average 125%, range from 86 to 467%) for all the concentration/purification techniques tested. The quality of the antibodies was shown to be critical, with antibodies from some suppliers yielding recoveries a low as 10% in some cases. This difficulty could, however, be overcome by the utilization of the antibody provided by Chemunex. These data conclusively prove that laser scanning cytometry, which greatly facilitates the microscopic enumeration of Cryptosporidium oocysts from water samples and decreases the time of observation by four to six times, can be successfully applied to water concentrates prepared from a variety of concentration/purification techniques.

Different Types of Auricular Keloids and Treatment by Intralesional Cryosurgery: Best Practice for Obtaining Long-Lasting Clinical Results

Dermatology ◽  
2021 ◽  
pp. 1-10
Author(s):  
Yaron Har-Shai ◽  
Lior Har-Shai ◽  
Viktor A. Zouboulis ◽  
Christos C. Zouboulis
Keyword(s):  
Quality Of Life ◽  
Body Image ◽  
Recurrence Rate ◽  
Best Practice ◽  
Clinical Results ◽  
Psychosocial Impact ◽  
Aesthetic Outcome ◽  
The Past ◽  
Different Types

<b><i>Background:</i></b> Auricular keloids belong to the most perplexing medical conditions, which have significant psychosocial impact on the patient’s body image and quality of life. <b><i>Summary:</i></b> The article is purposed to provide dermatologists and plastic surgeons with the best proven practice using intralesional cryosurgery for the treatment of the different auricular keloid types in order to obtain superior clinical results by minimizing the probability of recurrence. In the past 20 years, the authors have developed novel procedures in order to increase the effectiveness of intralesional cryosurgery on auricular keloids, including hydrodissection, warm gauze technique, and excision of dangling skin. Long-lasting clinical results with a low recurrence rate and a satisfactory aesthetic outcome are achieved with no deformation of the ear framework.

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