1,720,955 research outputs found
Metaheurística ACO en dos etapas aplicada al problema del Job Shop Scheduling
No full textLa metaheurística “Optimización basada en colonias de hormigas” (Ant Colony
Optimization, ACO) es uno de los nuevos paradigmas que permiten la resolución de
problemas combinatorios del tipo NP-Hard. En este trabajo de diploma proponemos
una nueva estrategia de cooperación nombrada ACO en dos etapas aplicada al
problema del Job Shop Scheduling (JSSP). Esta técnica fue propuesta por el grupo
de Inteligencia Artificial del departamento de computación de la facultad. La nueva
estrategia propone hacer una división en el espacio de búsqueda en dos etapas, en la
primera una parte de las hormigas van a solucionar un subproblema de tamaño
inferior al problema original, estas subsoluciones servirán de estado inicial para que
las hormigas restantes busquen soluciones al problema general, logrando una mejor
organización más cooperativa. Para evaluar la nueva estrategia se escogió el Ant
System (AS) y el análisis de los resultados se hizo con el paquete matemático SPSS.
El nuevo modelo muestra un mayor rendimiento en cuanto al tiempo de ejecución y
la calidad de las soluciones.The Ant Colony Optimization metaheuristic is one of the new paradigms in the solution of NP-hard combinatorial problems. In the present work we propose a new cooperation strategy named Two-Step ACO applied to the Job Shop Scheduling Problem (JSSP). This technique was proposed by the Artificial Intelligence Research Group of the Computer Science department of our faculty. The new strategy propose a division of the search space in two stages, in the first stage, a part of the ants reach preliminary solutions with a size smaller than the original problem, these partial solutions serve as initial states for the search performed by the ants in the second stage. In order to evaluate the new strategy the Ant System algorithm was chosen; the results analysis was done through the software SPSS. The new model shows better performance than the traditional in the execution time and the solutions quality.Facultad de Matemática, Física y Computación. Departamento de Matemáticanon-publishe
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
Analysis of the temperature behavior model for the optimization of sowing (TOMATO (Solanum licopersicum))
Get PDFMathematics has continued to increase its presence in the sciencesand in the economic sectors, in general. Along with informationtechnologies, huge volumes of data are processed that facilitateanalysis and serve for objective decision-making. The avoidance ofagricultural risks is a task of the first order to safeguard foodsecurity and thus reducing the vegetative periods in crops is aneffective strategy to achieve it. The work is carried out in theBabahoyo canton, Los Ríos province on obtaining behavior modelsof air temperatures that facilitate, through the application ofDifferential Calculation, obtaining the dates of maximumtemperatures, which would allow obtaining the periods of highertemperatures. thermal supply to accelerate growth anddevelopment processes. The dates of maximum temperature werelocated around decade 7, between March 13 and 17, results of thesum of probabilities for 75%. The sums of temperatures obtainedfluctuate in the range 2170 – 2266 Celsius Degrees that guaranteethe acceleration of the vegetative period, since they have 100% ofthe sum of probabilities of being reached. Observe a managementdirected to the selection of the period of highest temperature willreduce the risks of pests and extreme events, in addition toreducing inputs in agricultural production, which will increase thesustainability of the system
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
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