1,722,245 research outputs found
The Combined Effect of Multiple Models Sequencing and Absenteeism/Turnover on the Throughput of Assembly Lines
No full textThe Assembly lines typically employ dozens and sometime hundreds of workers. So absenteeism and turnover are encountered daily in these lines. This research analyzes the impact of absenteeism and turnover in assembly and production lines of mixed model mass production. It shows that model sequencing policy has very significant effect on the line's throughput. Replacing an experienced absent worker by a new one in a station results in a learning curve of the new worker. The new worker starts slowly and has a good chance of becoming a bottle-neck and dictating the pace for all the line. In that case, the throughput at the end of the line mirrors the new worker learning curve. In mixed model assembly lines the work in some stations varies according to the arriving model. A new replacement worker at such a station has slower learning process due to the less repetitive work. Still, there are typically many work elements that are common to all the models; there may be work elements that are only missing in one model, etc. We show how to compute the station's learning curve in such cases. A small case study shows that sustitute workers generate smaller throughput on mixed model lines than on a single model line
Absenteeism/Turnover Analysis in Mixed-Model Assembly Lines.
No full textMixed model line produces several product models, and requires from a substitute worker more learning than single-model lines. Assembly lines typically employ hundreds of workers and absenteeism and turnover are encountered daily. Absenteeism and turnover in any station along the line require replacing the absent worker by a new one with a learning curve. The new replacement worker has slower learning process due to the less repetitive work. Still, the learning pattern and effectiveness of the substitute worker depends on the similarity of product models launched. This research analyzes the impact of absenteeism and turnover in assembly lines of mixed model. It shows that model sequencing policy has very significant effect on the line's throughput as it affects bottleneck stations. A small case stud
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
'La muerte avla por mi boca': Marcel Cohen y la agonía del judeoespañol
No full textThe Judeo-Spanish idiolect reproduced in "Letras a un pintor ke kreya azer retratos imaginarios" (1985) [In "Search of a Lost Ladino", Jerusalem 2006] by Marcel Cohen and the author ́s own reflections on this topic serve as a background for the analysis of the endangerment of the Judeo-Spanish language. From a social point of view, the displacement of Judeo-Spanish by French (the dominant language in Cohen) and the author ́s dissociation from Sephardic speaking social networks turned him into a 'semi-speaker' or a 'rememberer', a prototype-speaker of an endangered language. The situation of linguistic isolation in which the author lives, the reduction of the domain of Judeo-Spanish and the reduction of the author ́s linguistic repertoire lead to a loss of linguistic competence that is manifest in the insecurity with which ohen expresses himself and in the construction of linguistic features that do not exist beyond the text "Letras a un pintor".El idiolecto judeoespañol representado en "Letras a un pintor ke kreya azer retratos
imaginarios" (1985) de Marcel Cohen y sus reflexiones sirven de fondo para el análisis de su situación como lengua amenazada de muerte. A nivel social, el esplazamiento del judeoespañol por el francés, que actúa como lengua dominante en Cohen, y su desvinculación de las redes sociales de hablantes de sefardí lo convirtieron en «semihablante» y «recordador», el prototipo de hablante de leguas amenazadas. La situación de aislamiento del autor, la extrema reducción de los dominios de uso de la lengua vernácula y de su repertorio lingüístico conducen a la pérdida de competencia lingüística que se manifiesta en la inseguridad con la que se expresa y en la construcción de formas lingüísticas que no existen más allá del texto "Letras a un pintor
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