1,720,988 research outputs found
Performance Evaluation of Full Adder Using Mach–Zehnder Interferometer and Polarization Effect on WDM Channels
No full textM.E. (Electronics and Communication Engineering)The optical communication system has many advantages over the long distance
communication and fast switching. The requirements of data transmission for
communication are increasing day by day. But the bandwidth is limited for transmission.
In this thesis, two types of techniques are discussed for transmitting the data from
transmitter to receiver.
Firstly Mach–Zehnder Interferometric devices for optical processing which is used as a
wavelength-spacing tunable comb filter in a fiber ring laser is built by employing an
optical variable delay line (OVDL). Semiconductor optical amplifier (SOA)-based
Mach–Zehnder interferometer (MZI) and Optical tree architecture (OTA), both play an
important role in optical interconnecting networks. In this thesis the proposed SOA-MZIbased
tree architecture is used with new and alternative scheme, for integrated all-optical
logic and arithmetic operations. In this architecture the continuous wave laser source and
control signal are passes through the coupler. The pulsed signal at the wavelength is
split at coupler and more power passes through one arm. At the same time, the CW
signal at wavelength is split equally by this coupler and propagates simultaneously in
the two arms. This architecture can enable to perform all-optical processing of signals,
like half-adder, full-adder, etc.
Secondly in optical communication data can be transmitting into the fiber by different
techniques. In the proposed architecture the data is send by wave division multiplexing
techniques from transmitting end and the effect of polarization seen on channel spacing
is 50 GHz and they are generated in groups by odd and even channels by PRBS
generator. Initially all channels have the same polarization state. All even channels
before being multiplexed with odd channels are passed through the Polarization Shifter,
which rotates the polarization state by different angle. After multiplexing the signal is
launched into a fiber, and then is de-multiplexed and sent to 8 receivers. At the receiving
end measured BER is minimum and Q-factor is maximum for 90 degree state of
polarization
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A Novel Inpainting Framework for Virtual View Synthesis
Get PDFMulti-view imaging has stimulated significant research to enhance the user experience of free viewpoint video, allowing interactive navigation between views and the freedom to select a desired view to watch. This usually involves transmitting both textural and depth information captured from different viewpoints to the receiver, to enable the synthesis of an arbitrary view. In rendering these virtual views, perceptual holes can appear due to certain regions, hidden in the original view by a closer object, becoming visible in the virtual view. To provide a high quality experience these holes must be filled in a visually plausible way, in a process known as inpainting. This is challenging because the missing information is generally unknown and the hole-regions can be large. Recently depth-based inpainting techniques have been proposed to address this challenge and while these generally perform better than non-depth assisted methods, they are not very robust and can produce perceptual artefacts.
This thesis presents a new inpainting framework that innovatively exploits depth and textural self-similarity characteristics to construct subjectively enhanced virtual viewpoints. The framework makes three significant contributions to the field: i) the exploitation of view information to jointly inpaint textural and depth hole regions; ii) the introduction of the novel concept of self-similarity characterisation which is combined with relevant depth information; and iii) an advanced self-similarity characterising scheme that automatically determines key spatial transform parameters for effective and flexible inpainting.
The presented inpainting framework has been critically analysed and shown to provide superior performance both perceptually and numerically compared to existing techniques, especially in terms of lower visual artefacts. It provides a flexible robust framework to develop new inpainting strategies for the next generation of interactive multi-view technologies
Collection of tools and resources for managing the statistical disclosure control of trained machine learning models
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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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