1,720,958 research outputs found
Manufacturing and Design for Six Sigma (X-FSS).
No full textManufacturing and Design For Six Sigma (X-FSS) is an effective process pieced from conceptual design methodologies, axiomatic design in particular, Taguchi's off line quality methods and Six Sigma philosophy. The objective is to improve design quality in the up-front phases of the development cycle by releasing weakness-free systems at both conceptual and operational levels. Although researchers and practitioners have proposed a multitude of design methodologies pertinent to design context, such as system design, parameter and tolerance design, there is still much room for improvement. Taking a closer look at these methodologies, this research proposes a design for six-sigma process over two phases: The Conceptual Design For Capability (CDFC) phase and the Tolerance Optimization (TO) phase. The objective of the CDFC phase is to eliminate or reduce the conceptual weaknesses created in the design entity due to design axioms violation. The purpose of the TO phase is to limit coupling, a conceptual weakness, when not resolved in the CDFC phase and release the system at six-sigma quality level in all of its functional requirements. The TO features a nonlinear optimization program based on a variety of economic considerations by utilizing quality loss function (incurred by the customer) and the precision control cost (incurred by the producer). Determination of design parameters and process variables, such as mean and variance, is scrutinized for constraining conceptual weaknesses and economic design consideration. Moreover, the reasoning behind the tolerance optimization is extended to the case of multiple functional requirements within the TO systematic approach and a solution is derived to further extend its application to all levels of design mappings. A defining aspect of this research is an extensive derivation of various statistical quantities of individual design requirements by establishing several links central to Six-Sigma and robustness measures. An illustrative example is presented to demonstrate the applicability of the X-FSS process and its benefit in terms of the magnitude of design weaknesses improvement. The significance of this research is to provide an applicable process as an alternative to traditional design methodologies so that engineers will benefit from it as they embark on new design assignments.Doctor of Engineering (DEng)Applied SciencesIndustrial engineeringMechanical engineeringSystems scienceUniversity of Michigan, Horace H. Rackham School of Graduate Studies College of Engineering Graduate Professional Programshttp://deepblue.lib.umich.edu/bitstream/2027.42/123327/2/3071404.pd
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
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