1,722,420 research outputs found
On the Switching Gap of Ahlswede¿Cai¿Li¿Yeung's Single-Source Multicast Network
No full textAhlswede, Cai, Li, and Yeung have proposed a new paradigm of network coding in multicast networks. They demonstrated that network coding can achieve the maximum information flow in the single-source multicast networks beyond the conventional network switching. A basic problem arising here is that, for a given single-source multicast network, what is the switching gap of the network defined as the ratio of the maximum information flow in the multicast network with network coding to that only with network switching. In this brief, we investigate the maximum possible switching gap of Ahlswede-Cai-Li-Yeung\u27s single-source multicast network and find some condition, in terms of the capacity of links, under which Ahlswede-Cai-Li-Yeung\u27s network has the minimum possible switching gap of one. © 2006 IEEE
Study on the Influence of Knots on the Seismic Performance of Chinese Traditional Wooden Building Beams
Get PDFLog is widely used in Chinese traditional wooden buildings, which has good compression, bending, tensile and seismic performance, but the existence of knots in log will have a greater adverse impact on the structure. Taking the residence of Zhou Fujiu, a salt merchant in Yangzhou as an example, the building was built in the late Qing Dynasty, covering an area of 3700 square meters. Through the field investigation of Zhou Fujiu building in Yangzhou, it is found that in addition to the common natural cracks, the wooden beams with knots in the tension zone are obviously damaged. In order to further study the influence of knots on the seismic performance of wooden beams and provide relevant theoretical basis for the protection of traditional Chinese wooden buildings, six different wooden beams were designed according to the scale of 1:5.28, and the low cycle reciprocating loading test under three-point loading was carried out. The effects of knots at different positions and depths on the seismic performance of timber beams are simulated respectively. The hysteretic curve and skeleton curve of the timber beam with knots are obtained by experiments, and the stiffness degradation and energy dissipation capacity are analyzed. The results show that with the increase of the depth of the knots, the bearing capacity of the beam shows a significant decreasing trend, the hysteretic curve becomes more stable, the energy dissipation capacity decreases, and the seismic performance decreases. When there are knots on both sides of the bending and compression area, the seismic performance of the wooden beam decreases most significantly
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
Figures 3–5 in A new species of the genus Panorpa (Mecoptera: Panorpidae) from China with notes on its biology
No full textFigures 3–5. Panorpa longihypovalva sp. nov., male. (3) Abdomen, lateral view; (4–5) genital bulb, dorsal and ventral views.Published as part of Hua, Bao-Zhen & Cai, Li-Jun, 2009, A new species of the genus Panorpa (Mecoptera: Panorpidae) from China with notes on its biology, pp. 545-552 in Journal of Natural History 43 (9-10) on page 547, DOI: 10.1080/00222930802610519, http://zenodo.org/record/465197
FIGURE 2 in Sinopanorpa, a new genus of Panorpidae (Mecoptera) from the Oriental China with descriptions of two new species
No full textFIGURE 2. Adults of Sinopanorpa digitiformis sp. nov. A. Male; B. Female.Published as part of Cai, Li-Jun, Huang, Peng-Ying & Hua, Bao-Zhen, 2008, Sinopanorpa, a new genus of Panorpidae (Mecoptera) from the Oriental China with descriptions of two new species, pp. 43-54 in Zootaxa 1941 (1) on page 49, DOI: 10.11646/zootaxa.1941.1.4, http://zenodo.org/record/523106
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
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