105,853 research outputs found
Alternative characterizations of the extended Wedderburn–Guttman theorem
No full textAbstractLet A be a u by v matrix of rank a, and let M and N be u by p and v by q matrices, respectively, where p is not necessarily equal to q or rank(M′AN)<min(p,q). Takane and Yanai [Y. Takane, H. Yanai, On the Wedderburn–Guttman theorem, Linear Algebra Appl. 410 (2005) 267–278] investigated the conditions under which rank(A-AN(M′AN)-M′A)=rank(A)-rank(AN(M′AN)-M′A). This is called the extended Wedderburn–Guttman theorem. In this paper, we give alternative characterizations of these conditions using the product singular value decomposition (PSVD) of matrix triplets
Results of magnetic resonance imaging performed within 48 hours after head trauma in dogs and association with outcome: 18 cases (2007–2012)
No full textObjective—To review results of MRI performed within 48 hours after head trauma in dogs and identify associations between MRI findings and outcome. Design—Retrospective case series. Animals—18 dogs that underwent MRI within 48 hours after known head trauma. Procedures—Medical records were reviewed for information on signalment, history, clinical findings, MRI findings, treatment, and outcome. Results—2 dogs were euthanized, 1 died, and 1 had major persistent deficits. The remaining 14 dogs had a good outcome, including 9 that recovered completely and 5 that had minor persistent deficits. The most common MRI abnormalities were intra-axial changes (n = 13) and extra-axial hemorrhage (13). Intra-axial changes were best seen on T2-weighted and fluid attenuation inversion recovery (FLAIR) images. A mass effect was detected in 9 dogs, 6 of which had a midline shift (mean, 2.18 mm). Three dogs had transtentorial herniation, and 2 had transcranial herniation. Extra-axial hemorrhage was best seen on FLAIR images. The most common location was subdural, with subdural extra-axial hemorrhage most often seen on the same side as the injury. Epidural hemorrhage was seen in 2 dogs. The affected area was larger in these dogs than in dogs with subdural hemorrhage. One dog required surgery and the other was euthanized. Conclusions and Clinical Relevance—Results suggested that in dogs with acute (< 48 hours’ duration) head trauma, T2-weighted and FLAIR images provided the most diagnostic information. Dogs with injuries affecting the caudal fossa or affecting both the rostral and caudal fossae typically had poorer outcomes
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Low-dose smoking resumption in ex-smokers with refractory ulcerative colitis
No full textUlcerative colitis (UC) is primarily a disease of non-smokers. Ex-smokers may have a more refractory disease course and anecdotal evidence in non-controlled clinical trials have suggested that smoking resumption, or the administration of nicotine, may ameliorate signs and symptoms of UC in ex-smokers. We report outcomes of ex-smokers with refractory UC who resumed low-dose cigarette smoking
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
On Degenerate CM-types
No full textWe show a method of constructing degenerate CM-types. We also consider the fields of moduli for such CM-types.名古屋大学博士学位論文 学位の種類 : 博士(理学)(論文) 学位授与年月日:平成5年2月10日 柳井裕道氏の博士論文として提出されたH. Yanai, On Degenerate CM-Types, Journal of Number Theory, Volume 49, Issue 3, 1994, Pages 295-303, https://doi.org/10.1006/jnth.1994.1095.doctoral thesi
On Degenerate CM-types
No full textWe show a method of constructing degenerate CM-types. We also consider the fields of moduli for such CM-types.名古屋大学博士学位論文 学位の種類 : 博士(理学)(論文) 学位授与年月日:平成5年2月10日 柳井裕道氏の博士論文として提出されたH. Yanai, On Degenerate CM-Types, Journal of Number Theory, Volume 49, Issue 3, 1994, Pages 295-303, https://doi.org/10.1006/jnth.1994.1095
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
The construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
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