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NUEVAS ESTRATEGIAS DE OPTIMIZACIÓN EN PROCESOS DE PESAJE MULTICABEZAL
Get PDFIn the last few years, the food packaging industry has experienced a lot of growth. There are many factors that have contributed to this growth and some of them include modern concepts and advancement in technology. Managers of food industry must consider how to maintain profitability in an increasingly competitive market, while providing customers with high quality products and efficient service. Further automation of packing lines can help food companies meet these requirements; for example, multihead weighers used in the multihead weighing processes.
Multihead weighing technology has revolutionised the packaging lines and it is used to reduce product and process variability. A multihead weigher consists of various weighing heads or hoppers that ensures that products are weighed very quickly and accurately. This enables the desired amount of product to be determined and packed according to the precise weight (nominal value or target). It can be installed as part of an integrated weighing and packing line or interfaced with existing packing equipment. Moreover, it is ideal for precise and fast weighing of products ranging in size, from granulates to large and bulky products.
In this doctoral thesis, it sets out to analyse and compare a set of strategies designed to optimize the packaging process in multihead weighers and minimize the variability in weight of the packed product. We used monoobjective and multiobjective optimization techniques, the variability reduction index, the Taguchi loss function and a statistical analysis, to identify and establish the more accurate strategy in terms of variability in weight of the package.
The improvement approach that we propose is practical and it is based on the study of the filling setting of hoppers for find the optimum operational conditions of the multihead weigher. For each strategy, exact algorithms which follow an explicit enumerative strategy or exhaustive search were developed to evaluate the several values of the number of combined hoppers.
In the proposed multiobjective approach, the algorithms use an innovative a priori strategy to generate Pareto-optimal solutions and select a subset of hoppers in each packing operation, in such a way that the relative importance of the objectives is dynamically managed and adjusted. Once the packing process has been improved, this is monitored and controlled through the design of a modified control chart.En los últimos años, la industria del envasado de alimentos ha experimentado un gran crecimiento. Existen muchos factores que han contribuido a este crecimiento y algunos de ellos incluyen conceptos modernos y avances en la tecnología. Los gerentes de la industria alimentaria deben velar por mantener la rentabilidad en un mercado cada vez más competitivo, al tiempo de proporcionar a los clientes productos de alta calidad y un buen servicio. Una mayor automatización de las líneas de envasado puede ayudar a estas empresas a cumplir con los requisitos de calidad y servicio; por ejemplo, las pesadoras multicabezal utilizadas en los procesos de pesaje multicabezal.
La tecnología de pesaje multicabezal ha revolucionado las líneas de envasado y se utiliza para reducir la variabilidad de productos y procesos. Una pesadora multicabezal consta de varios cabezales de pesaje o tolvas que garantizan que los productos sean pesados con mucha rapidez y precisión. Esto permite envasar la cantidad deseada de un producto de acuerdo con su peso objetivo (valor nominal). Puede instalarse como parte de una línea integrada de pesaje y envasado o conectarse con equipos de envasado existentes. Además, es ideal para el pesaje preciso y rápido de productos que varían en tamaño, desde granulados a productos grandes y voluminosos.
En la presente Tesis Doctoral, se desarrolla un conjunto de estrategias diseñadas para optimizar el proceso de envasado en pesadoras multicabezales y minimizar la variabilidad en el peso del producto envasado. Para esto, se utilizan técnicas de optimización monoobjetivo y multiobjetivo, el índice de reducción de variabilidad, la función de pérdida de Taguchi y un análisis estadístico para identificar y establecer la estrategia que ofrezca el mejor rendimiento en términos de variabilidad en el peso del paquete.
El enfoque de mejora que proponemos es práctico y se basa en el estudio del ajuste de llenado de las tolvas para encontrar las condiciones operativas óptimas de la pesadora multicabezal. Para cada estrategia, se desarrollaron algoritmos exactos los cuales siguen una estrategia enumerativa explícita o búsqueda exhaustiva para evaluar distintos valores del número de tolvas combinadas.
En el enfoque multiobjetivo propuesto, los algoritmos utilizan una novedosa estrategia a priori para generar soluciones Pareto-óptimas y seleccionar un subconjunto de tolvas en cada operación de envasado, de tal manera que la importancia relativa de los objetivos considerados es dinámicamente gestionada y ajustada. Una vez que el proceso de envasado ha sido mejorado, este se monitorea y controla a través del diseño de un gráfico de control modificado.En els últims anys, la indústria de l'envasament d'aliments ha experimentat un gran creixement. Existeixen molts factors que han contribuït a aquest creixement i alguns d'ells inclouen conceptes moderns i avanços en la tecnologia. Els gerents de la indústria alimentària han de vetlar per mantenir la rendibilitat en un mercat cada vegada més competitiu, tot proporcionant-hi alhora als clients productes d'alta qualitat i un bon servici. Una major automatització de les línies d'envasament pot ajudar aquestes empreses a complir amb els requisits de qualitat i servici; per exemple, les pesadores multicapçal utilitzades en els processos de pesatge multicapçal.
La tecnologia de pesatge multicapçal ha revolucionat les línies d'envasament i s'utilitza per a reduir la variabilitat de productes i processos. Una pesadora multicapçal consta de diversos capçals de pesatge o tremuges que garanteixen que els productes siguen pesats amb molta rapidesa i precisió. Açò permet envasar la quantitat desitjada de producte d'acord amb el seu pes objectiu (valor nominal). Pot instal¿lar-se com a part d'una línia integrada de pesatge i envasament o bé connectar-se amb equips d'envasament existents. A més, és ideal per al pesatge precís i ràpid de productes que varien en grandària, des de granulats fins a productes grans i voluminosos.
En la present Tesi Doctoral es presenta un conjunt d'estratègies dissenyades per a optimitzar el procés d'envasament en pesadores multicapçal i minimitzar la variabilitat en el pes del producte envasat. Per a això, s'hi utilitzen tècniques d'optimització monoobjectiu i multiobjectiu, l'índex de reducció de variabilitat, la funció de pèrdua de Taguchi i una anàlisi estadística per identificar i establir l'estratègia que oferesca el millor rendiment en termes de variabilitat en el pes del paquet.
L'enfocament de millora que hi proposem és pràctic i es basa en l'estudi de l'ajust d'emplenament de les tremuges per a trobar les condicions operatives òptimes de la pesadora multicapçal. Per a cada estratègia, es van desenvolupar algoritmes exactes, els quals segueixen una estratègia enumerativa explícita o cerca exhaustiva per avaluar diferents valors en el nombre de tremuges combinades.
En l'enfocament multiobjectiu proposat, els algoritmes utilitzen una novedosa estratègia a priori per a generar solucions Pareto-òptimes i seleccionar un subconjunt de tremuges en cada operació d'envasament, de tal forma que la importància relativa dels objectius considerats és dinàmicament gestionada i ajustada. Una vegada que el procés d'envasament ha sigut millorat, és així mateix monitoritzat i controlat a través del disseny d'un gràfic de control modificat.Pulido Rojano, ADJ. (2017). NUEVAS ESTRATEGIAS DE OPTIMIZACIÓN EN PROCESOS DE PESAJE MULTICABEZAL [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/81859TESI
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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