1,721,094 research outputs found
A Genetic Procedure for Production Scheduling Automatic Design
No full textProduction scheduling represents part of the complex flow of information and decision-making in manufacturing planning and control system. In recent years, production scheduling has become an essential activity for achieving competitive service levels, lower lead times, reduction costs as well as customers satisfaction. Depending on facilities layout assessment (e.g., flow shop, job shop, cellular manufacturing, etc), many approaches have been introduced to optimize the scheduling and many meta-heuristic techniques have been developed. The present work deals with the problem of defining the monthly production schedule in a flow shop production line. The exploration and exploitation of possible solutions have been reached by using a population based formulation (i.e. Genetic Algorithm) in robust perspective and Variance analysis (i.e., ANOVA) was used to identify the critical parameters in the genetic model. The main advantage of such an algorithm over the other approaches is represented by the possibility to evaluate and control the optimization process as a natural evolution. The overall equipment efficiency, the warehousing costs with constraints of finite capacity, the production orders, the production rate are the main parameters accounted. Results will be presented in terms of reduction of overall costs in real flow shop manufacturing environment
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
Chirurgia mini-invasiva articolare ed extra-articolare assistita dall’endoscopia. Tecniche e risultati in patologia ortopedica
No full textAbstract
The minimally invasive and arthroscopically assisted surgery is a new therapeutic resource in the surgical treatment of degenerative and prosthetic orthopaedic pathology; in the field of neoplastic one it is just dawning. In this work the AA. report the technique and results of the arthroscopically assisted percutaneous arthrodesis of the ankle and of the arthroscopically assisted percutaneous curettage of epiphyseal chondroblastoma (E.C.) and osteoid osteoma (O.O.) of skeleton. From 1992 to 2002 they treated 12 selected cases: 4 affected by E.C., 3 located at proximal tibia and 1 at proximal humerus, in patients aged from 13 to 16 years and evaluated at a follow-up ranging from 7 to 3 years, with a 75% of good results; 4 affected by osteoid osteoma of proximal femur (2) and tibia (2), in patients aged from 13 to 18 years, evaluated at a follow-up ranging from 12 to 3 years with very good results (75%); 4 cases of ankle'painful stiffness, with 1 case of severe weightbearing instability, in patients aged from 17 to 75 years, evaluated at final bone fusion, radiographically observed at a average of 3.2-month follow-up from operation. All cases were treated by MIS criteria under accurate radiographic and CT-3D pre-operative planning, endoscopic (trans-osseous tunnels) and/or arthroscopic (ankle arthrodesis) continuous assistance under fluoroscopy. Two cases received cortico-cancellous bone autografts. All neoplastic cases had histologic confirmation by excision biopsy. They report 2 cases of failure, 1 in the E.C. series (25%) and 1 among the O.O. (25%), respectively at 6 and 12 months from the operation. In conclusion the authors report good results in 75% of cases together with very good aestheticism, well accepted by patients, and with articular function not minimally altered by the technique
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