1,721,282 research outputs found
A simple method to determine pressure curve for sheet hydro-forming and experimental verification
No full textA simple method to determine optimal pressure curve for sheet hydro-forming has been proposed. The determination of the pressure curve is carried out by characterizing the curve three parameters, e.g. initial pressure, final pressure and pressure path. Through the study of previous works, general shape of the pressure curve for hydro-forming is monotonically increasing with respect to a punch stroke. Since the penetration volume to a pressure chamber by a punch is of the similar characteristics as the punch stroke, and the shape of the pressure-stroke curve is non-linear in general, the pressure path is assumed to be proportional to the penetration volume by a punch, rather than punch stroke. During the hydro-forming experiment, it is observed that the major cause of failures in the early forming stage is related to lifting of a blank from a die surface due to the penetration of punch. Now the initial pressure is determined from the lifting-prevention condition. From the initial pressure, the assumption of pressure path and some chosen trial final pressure values, the pressure curves are interpolated in a straightforward manners. Then, FE analyses are carried out to predict whether failure occurs or not. From the result of FE analysis, optimal final pressure curve has been determined among the trial final pressure curves. The corresponding experiment has been carried out with an experimental hydro-forming press where the pressure is controlled by a proportional relief valve. The press is relatively inexpensive, under an open-loop control system. Through the comparison of experiment and analysis, the predicted pressure curve has been verified an optimal for the successful forming since no defect has been observed. (c) 2005 Elsevier B.V. All rights reserved
A control theoretic approach to malaria immunotherapy with state jumps
No full textWe investigate a control method for malaria dynamics to boost the immune response using a model-based approach. The idea of state jump is introduced and discussed using a hybrid model. To implement the state jumps we use a physiologically feasible method for the biological system, whereby the introduction of a pathogen into the system steers it to a desirable status. It is noted that we take advantage of a pathogen to implement state jumps in the system. The study is supported by recently reported experimental results
Data Reuse Method between Heterogeneous Partitions (DRHP) in H.264/AVC motion compensator
No full text
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
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