1,720,987 research outputs found
An Exact Solution Algorithm to Solve the No-Wait Flow Shop Scheduling Problem with Earliness and Tardiness Objectives
No full textU-şekilli karışık modelli montaj hatlarında hat dengeleme ve model sıralama problemlerinin eşzamanlı çözümü için genetik algoritma tabanlı bir yaklaşım
No full textKarışık modelli montaj hatlarında (KMMH), hattın geleneksel veya U-şeklinde olmasına bakılmayarak, iki önemli problem oluşur. Bu problemlerden ilki işlerin iş istasyonlarına nasıl atanacağı ve ikincisi hatta üretilecek farklı modellerin hangi sırayla üretileceğinin seçilmesidir._x000B_Bu tezde U-şekilli karışık modelli montaj hatlarındaki hat dengeleme/model sıralama (UŞKMMH/HDMS) problemlerinin eşzamanlı uygulanmasındaki zorluklarının üstesinden gelebilmek için, Öncelik Tabanlı Genetik Algoritma (ÖTGA) tabanlı bir yaklaşım önerildi. Önerilen algoritmada, çözüm değerlendirmelerinin kolay ve etkili bir biçimde yapılabilmesi için Tavlama Benzetimi (TB) algoritması tabanlı çözüm değerlendirme yaklaşımı geliştirildi. Önerilen yaklaşımda, hat dengeleme ve model sıralama problemlerinin eşzamanlı ele alınabilmesini sağlamak amacıyla yeni komşuluk üretme mekanizması geliştirildi. Önerilen ÖTGA tabanlı yaklaşım, gerçek hayat montaj hatlarında sıkça rastlanan paralel istasyon ve bölgesel kısıtlar gibi özellikleri ele alabilecek niteliktedir. UŞKMMH/HDMS çözümünde paralel istasyon ve bölgesel kısıtlar daha önce hiçbir çalışmada beraber ele alınmadı._x000B_Ayrıca, yeni değerlendirme fonksiyonu geliştirildi. Yeni değerlendirme fonksiyonu birincil amaç olarak istasyon sayısını minimize etmekte ve ikincil amaç olaraktan bütün çevirimler sonunda istasyon içi-arası iş yükü dengesini sağlamaktadır._x000B_Son olarak, önerilen yaklaşımın performansı test problemleri için üretilen en küçük kısım setleriyle test edildi. Two important problems occur routinely on mixed-model production lines, regardless of whether the lines are traditional or U-shaped. The first one is the problem of how to assign tasks to stations on the line and the second one is the problem of selecting the order or sequence in which different models will be produced._x000B_In this thesis, a Priority-Based Genetic Algorithm (PGA) based solution approach is proposed in order to overcome implementation difficulties of the mixed-model U-shape assembly line balancing/sequencing problem (MMUL/BS) simultaneously. In proposed algorithm, Simulated Annealing (SA) algorithm based fitness evaluation approach is developed for being able to make fitness function calculations easily and effectively. In proposed approach, new neighborhood generation logic is developed in order to handle line balancing and model sequencing problems simultaneously. The proposed PGA based algorithm is able to address some particular features of the assembly process very common in real mixed-model assembly lines such as use of parallel workstations, zoning constraints. Parallel work stations and zoning constraints have not been used together in MMUL/BS solution so far._x000B_Moreover, new fitness function is developed. New fitness function minimizes the number of stations as primary objective, and ensures the workload balance within and between workstations at the end of cycles as secondary objective._x000B_Eventually, performance of the proposed approach is tested through a set of test problems with generated minimum part sets
Nested GRASP algorithm for solving the no-wait distributed permutation flow shop scheduling problem
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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
Tip-II Basit Montaj Hattı Dengeleme Probleminin Bölge Kısıtlamaları ile Çözümüne Yönelik Benders Ayrıştırma Algoritması
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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
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