1,721,219 research outputs found
Performance of a New Type of Impactor with a Cooled Impaction Plate for Sampling E. coli and B. subtilis Bacteria Bioaerosol
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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
A knowledge-based maintenance of legacy systems: METASOFT
No full textThe maintenance of legacy systems is a continuous problem in the field of software maintenance. To assist in the maintenance of legacy systems, we have represented the legacy systems and the maintenance requirement in a compatible manner so that the maintenance requirement can be a clue for identifying the relevant program clauses and data items in the database. For this purpose, a maintenance component is represented by the maintenance mode (add, modify or delete) and property and key words. The corresponding information about the program's clauses is extracted from the source code of the legacy program by reverse engineering. The maintenance point identification algorithm-MPI algorithm-proposed in this research is theoretically complete and relatively efficient, and is proved so empirically Using this approach, the system METASOFT has been developed for the Korea Electric Power Corporation which uses the COBOL programs and IMS database. It turns out that the system is well accepted by the users. (C) 1997 Elsevier Science Ltd
The effects of several growth parameters on the formation behavior of point defects in Czochralski-grown silicon crystals
No full textVariation of growth parameters such as the crystal rotation rate, the crucible rotation rate and the configuration of cusp magnetic fields results in the increase or the decrease of critical growth rate V*, transition from interstitial to vacancy, of Czochralski (CZ)-grown silicon crystals. It can also make axially asymmetric distributions of grown-in microdefect regions. V* is remarkably increased in some range of the crystal rotation rate and the crucible rotation rate, which are likely to depend on crucible shape, size and melt volume. The crystal rotation rate as well as the crucible rotation rate affects the incorporation of point defects into the growing crystal through modification of the melt convection. Variation of the configuration of cusp magnet also can increase V* since it affects the melt temperature field. Significant results of interstitial-rich region at crystal center and vacancy-rich region at crystal edge are given in the minority carrier life-time map. These effects are directly caused by the change of heat flow in the melt, controlled with the crystal rotation rate, the crucible rotation rate and the magnetic configuration. The axial temperature gradient in the crystal near the crystal-melt interface is indirectly affected by heat flow through the crystal-melt interface. In addition, the novel technique, the unbalanced magnetic technique, is proposed to control heat transfer and oxygen transfer separately. (c) 2006 Elsevier B.V. All rights reserved
Non-linear joint parameter identification using the frequency response function of the linear substructure
Full text linkA method based on frequency domain approaches is presented for the non-linear parameter identification of a structure having non-linear joints. The frequency response function (FRF) of the linear substructure, which can be calculated from the finite element method or measured by an experimental method, is used to calculate its FRFs needed in the parameter identification process. This method is easily applicable to a complex real structure having non-linear joints since it uses the FRF of the substructure. Since this method is performed in the frequency domain, the number of equations can be easily increased to as many as required to identify unknown parameters, not only by just varying the excitation amplitude but also by selecting the excitation frequencies. The validity of this method was tested numerically and experimentally with a cantilever beam having a non-linear element. It was verified through examples that the proposed method is useful to identify the non-linear joint parameters of a structure having arbitrary boundaries
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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