1,720,993 research outputs found
Matheuristic Fixed Set Search Applied to the K-Dominating Set Problem
No full textIn a wide range of real-world covering problems, like finding the optimal locations of electric vehicle charging stations, it is of high importance to have resistance to component failures. One effective way of modeling this type of robustness is the k-dominating set problem. Solving this problem is computationally challenging due to its NP-hardness. This challenge is tackled by employing the fixed search set (FSS) metaheuristic. The Matheuristic Fixed Set Search (MFSS) is applied, which combines mathematical programming and the FSS learning mechanism. We perform extensive computational experiments on commonly used benchmark instances, comparing the algorithm's performance against the well-known GRASP metaheuristic and the commercial solver CPLEX. The experimental findings show that the proposed MFSS algorithm produces highly competitive results at a lower computational cost
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
Effects on airline costs of different air traffic management scenarios: an assessment method based on fast-time simulation outputs
No full textThis paper develops a methodology to compare the economic suitability of different Air Traffic Management (ATM) scenarios using Fast-Time Simulations (FTS), from an airline perspective. So far, FTS was mainly used for preliminary assessment of the capacity- and safety-related effects of novel ATM concepts, with hardly any application concerning the economic implications of those concepts. As a novelty, we put forward a method to assess costs to airlines’ of a new ATM scenario, based on FTS outputs. We first discuss the relevant ATM-related airlines’ economic interests, and consequently identify the associated indicators. To provide consistency with the Single European Sky II requirements and specifications, we show that our approach is clearly aligned with the performance-based framework proposed by the Single European Sky ATM Research Programme (SESAR).Then we demonstrate the capabilities of the FTS to address economic aspects of an ATM scenario. We illustrate the methodology through a case study of different sectorisations of the Greek airspace. The results indicate that FTS allows for a detection of statistically significant airline cost differentials between alternative ATM scenarios
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
ALICE: adaptive learning via interactive, collaborative and emotional approaches
No full textGrid technologies are rising as the next generation of Internet by defining a powerful computing paradigm by analogy with the electric Power Grid. A Grid user is able to use his private workplace to invoke any application from a remote system, use the system best suited for executing that application, access data securely and consistently from remote sites, exploit multiple systems to complete economically complex tasks or to solve large problems that exceed the capacity of a single system. Grid could be used as a technology “glue” providing users with a uniform way to access resources by means of several devices. These technologies can provide, in a natural way, a support for Technology Enhanced Learning (TEL) by enabling new learning environments based on collaboration, social interaction, experience, realism, personalisation, ubiquity, accessibility and contextualisation. Nevertheless, to be effectively used in TEL, Grid must be complemented with other elements like semantics and educational modelling so bringing to the concept of “Grid for Learning” whose description is the object of this paper
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
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