1,720,990 research outputs found
Representations of Knot Groups and Twisted Alexander Polynomials
No full textlot of questions open. First of all, we are not yet able to overcome the technical difficulties involved in generalizing the definition of twisted Alexander polynomials from knots to links. Without such a generalization, it seems to be very difficult to find any relation between twisted Alexander polynomials and [HOMFLY] polynomials. Another important question is how to generalize the definition of twisted Alexander polynomials to knots in homology 3-spheres. A knot in a homology 3-sphere bounds an unknotted Seifert surface. With an appropriate definition of regular Seifert surfaces, we expect that Theorem 1.7 is still true in this setting. Notice that an unknotted Seifert surface gives us a Heegard decomposition of the ambient homology 3-sphere, it is reasonable to expect that a generalization of twisted Alexander polynomials to homology 3-spheres 2 XIAO-SONG LIN will have something to do with Casson's invariant of homology 3-spheres (even in the generaliz
On the classification of links up to finite type
No full textWe use an action, of 2l-component string links on l-component string links, defined by the first author and Xiao-Song Lin, to lift the indeterminacy of finite type link invariants. The set of links up to this new indeterminacy is in bijection with the orbit space of the restriction of this action to the stabilizer of the identity. Structure theorems for the sets of links up to C_n-equivalence and Self-C_n-equivalence are also given
On the classification of links up to finite type
Full text linkWe use an action, of 2l-component string links on l-component string links, defined by the first author and Xiao-Song Lin, to lift the indeterminacy of finite type link invariants. The set of links up to this new indeterminacy is in bijection with the orbit space of the restriction of this action to the stabilizer of the identity. Structure theorems for the sets of links up to C_n-equivalence and Self-C_n-equivalence are also given
A self-consistency motivation analysis of employee reactions to job insecurity: The roles of organization-based self-esteem and proactive personality**
No full textDespite consistent evidence that job insecurity has negative effects on employee outcomes, further investigation into the mechanisms underpinning these influences remains desired. The psychological contract perspective may not be adequate to explain the negative effect of job insecurity, especially when considering the trend of proactive perspective for work. To extend explanations beyond the psychological contract theory and invoke a self-consistency motivational argument, we propose that employees' self-evaluation of their worth within an organization (i.e., organization-based self-esteem, OBSE) can incrementally explain the negative influence of job insecurity. Furthermore, we hypothesize that job insecurity would more strongly impair employees' OBSE for those who have more proactive personalities, resulting in more negative influences on their job performance and affective commitment. Tests of related hypotheses, with a sample of 176 subordinate–supervisor dyads from China, support our hypotheses. We discuss the implications of these findings for research and practice.This study was supported by the Humanities and Social
Science Fund from Ministry of Education of China (No. 15YJC630070)
awarded to Xiao Song Lin; and fund by Cynthia Lee's Walsh
Professorship, D'Amore-McKim School of Business, Northeastern
University
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
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
- …
