1,722,175 research outputs found
Benjamin D. Walsh: nineteenth century defender of Darwinian evolutionary theory
Full text linkHonors College, Washington State UniversityReive, Shannon Benjamin D. Walsh: nineteenth century defender of Darwinian evolutionary theory,Washington State University Honors College thesis, Fall 2005, 33 p
-D Walsh Coding With DCT Block Watermarking Technique of Colour Images Using Y Channel
No full textAbstract In this paper a new blind technique using one dimensional Walsh coding to improve the robustness of image watermarking is presented. The proposed technique inserts the binary bits of handwritten signatures in the DCT blocks of the Y channel of the digital colour image. Watermarking algorith m wh ich uses 1-D Walsh coding to embed mobile phone digits in images captured by the phone camera is also introduced. The 1-D Walsh coding can be applied either horizontally or vertically. The results presented here were obtained for horizontal 1-D Walsh coding. These results prove that the use of Walsh coding has improved robustness against JPEG co mpression
1-D Walsh coded watermarking technique for colour images using the Y channel
No full textIn this paper a new blind technique using one dimensional Walsh coding to improve the robustness of image watermarking is presented. The proposed technique inserts the binary bits of handwritten signatures in the DCT blocks of the Y channel of the digital color image. The 1-D Walsh coding can be applied either horizontally or vertically. The work was carried out using the horizontal 1-D Walsh coding. Results prove that the use of Walsh coding has improved robustness against JPEG compression.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Watermarking of images captured by mobile phone cameras using 2-D walsh coding in the Y-channel
No full text1-D Walsh coding was used to improve the robustness of digital image watermarking. In this paper, a robust and efficient digital image watermarking technique using 2-D Walsh coding is proposed. In this algorithm a personal mobile phone digits are embedded in images captured by the phone camera. The aim of the proposed technique is to protect the copyright ownership of the image. The algorithm is blind and does not require the original image in the extracting process. The mobile phone digits were encoded by using 2D Walsh functions then it was embedded in the low frequency coefficients of the discrete cosine transform of the host image. The performance of the proposed technique was evaluated using Stir mark tool. Results have shown that the use of 2-D Walsh coding survived various attacks such as JPEG compression, noise, and different image manipulation algorithms.</p
Watermarking of images captured by mobile phone cameras using 2-D walsh coding in the Y-channel
No full text1-D Walsh coding was used to improve the robustness of digital image watermarking. In this paper, a robust and efficient digital image watermarking technique using 2-D Walsh coding is proposed. In this algorithm a personal mobile phone digits are embedded in images captured by the phone camera. The aim of the proposed technique is to protect the copyright ownership of the image. The algorithm is blind and does not require the original image in the extracting process. The mobile phone digits were encoded by using 2D Walsh functions then it was embedded in the low frequency coefficients of the discrete cosine transform of the host image. The performance of the proposed technique was evaluated using Stir mark tool. Results have shown that the use of 2-D Walsh coding survived various attacks such as JPEG compression, noise, and different image manipulation algorithms.</p
Variations on the Author
Full text link“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
Full text linkWe 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
Full text linkWe 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
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