1,720,955 research outputs found
Health Prediction and Personal Pollution Exposure Monitoring using Pollution Sensors
Get PDFThe aim of this paper is to outline a wearable air pollution mapping system for an in- dividual. For this it incorporates interfacing some pollution related sensors (CO2, CO and clean sen-sor) to the clients body which will continually screen the encompassing air pollution levels and gure the correct measure of dangerous gasses breathed in by the client contingent on the breath- ing rate of the client. Contingent on these qualities, the client will be alerted continuously by indicating notices where pollution level has outperformed the allowable breaking point. The data will be pre- served (on-chip) and later analyzed using graphs and diagrams prepared in Excel using Visual Basic. The data analysis will provide the user with health prediction
Simulation of Material losses in SMD Fiber
Get PDFThe Simulation and analysis of the SMF is carried out with the total loss of the germania-doped silica-core fibers can be separated into the inherent ultraviolet absorption loss, the scattering loss and the inherent infrared absorption loss. It is also seen that the ultraviolet absorption loss and the scattering loss are dominated at the short wavelengths below 1.2 ?m and the infrared absorption loss is dominated at longer wavelengths above 1.5 ?m. The dopants have a great effect on the transmission loss of high-silica glass optical fibers at long wavelengths. When an optimum dopant is selected for making a doped-silica optical fibers and OH content is greatly reduced, a phenomenally broad window where the loss is below 1 dB/Km can be achieved. An ultimate lower loss SMF has been fabricated by reducing the excess loss due to imperfections of waveguide as much as possible. The loss mechanism in the optical fiber discussed has been also analyzed. Transmission losses have been reduced almost down to the intrinsic material loss and the minimum loss is 0.20 dB/Km at 1.55 ?m. The dispersion characteristics also analyzed at long wavelength the dispersion is minimized, thus it is confirmed that the single mode fibers are most applicable for long distance and large capacity transmission
OFDM-Based Based Cognitive Radio Networks for Spectrum Monitoring Using Energy Ratio Algorithm
Get PDFThis paper presents a spectrum mon- itoring algorithm for Orthogonal Frequency Di- vision Multiplexing (OFDM) based cognitive ra- dios by which the primary user reappearance or availability can be detected during the secondary user transmission. The proposed method or tech- nique reduces the frequency with which spectrum sensing must be performed and greatly decreases the elapsed period between the start of a primary transmission and its detection by the secondary network. This is done by sensing the change in signal strength throughout a number of reserved OFDM sub-carriers so that the availability of the primary user is easily detected. Moreover, the OFDM impairments such as power leakage, Narrow Band Interference (NBI), and Inter-Carrier Inter-ference (ICI) are investigated and their impacts are studied. Both analysis and simulation show that the energy ratio algorithm can e ectively and accurately detect the appearance of the primary user. Furthermore, this method achieves more im- munity to frequency-selective fading channels for both single and multiple receive antenna systems, with a complexity that is approximately twice that of a conventional energy detector.Cognitive radios o er the promise of being a disruptive technologies innovation that would enable the future wireless world. Cognitive radios network is programmable wireless devices that could sense their environment and dynamically adapted their transmission wave- form, channel access methods, spectrum used, and networking protocol as needed for better network and application performanc
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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