1,720,969 research outputs found
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
Detection of maintenance issues from UAV images of archaeological sites: A yolo-based tool
No full textProtecting cultural heritage (CH) is a strategic activity for all countries, like Italy, which has many ancient properties that can be degraded and damaged over time. Archaeological sites are critical CH assets for Italy, and their management and protection are crucial. Visitors can intentionally or unintentionally damage archaeological sites, while natural events like rain, wind, sun, and weeds can degrade or damage such CH assets. In such a context, modern technologies can effectively support monitoring activities. This paper presents the design of a framework for acquiring aerial images and their analysis, supporting operators on a site with detailed maintenance suggestions and information, and allowing the launch of new precision surveys to investigate identified issues better. We also propose a prototype tool for automatically detecting maintenance issues in an archaeological site based on AI models applied to aerial orthophotos of the site. The case study taken in the exam is related to the archaeological site of Pompeii, which provides high-definition orthophotos of its artistic resources using aerial drones. A prototype tool is proposed to discover such maintenance issues in such images rapidly, present them straightforwardly to support human operators’ decision-making and understand which site zone needs more attention. The maintenance issues to identify fall into four classes: weedy vegetation, damaged conduits, damaged structures, and broken tiles. In the experimental phase, a custom dataset was used to train and evaluate various versions of Yolo model. The best performance has been obtained through the YoloV5l detector, with a F1 score of 0.482, 0.427 for mAP0.5 and 0.264 for mAP0.5–0.95 on cross-validation, a 0.502 F1-score, 0.482 mAP50 and 0.279 mAP50-95 on the test set. The model has a FPS capacity of 54.945 frame/sec. The tool has proven good efficiency being capable of scanning and analyse an entire orthophoto of about 10 GBs in a few minutes
Preliminary Batch Tests for Succinic Acid Production and Co-Products through Fermentation by Actinobacillus Succinogenes
No full textSuccinic acid is one of the most used building blocks in different production chains. Conventionally, this carboxylic acid is produced through petrochemical routes, but can be also produced via biological routes. Many microorganisms, such as Actinobacillus succinogenes, synthesized succinic acid as an intermediate of many biochemical pathways, as the Krebs cycle. Nowadays, the industrial production of bio-succinic acid has been limited due to different critical issues, like the low productivity and yield and downstreaming processes. To improve the bio-based production, the operative conditions of the fermentation process needed to be optimized especially when agro-industrial residues were used as sugars feedstock. To this aim, in this study fermentation batch tests were performed by using different concentrations of A. succinogenes at a given glucose concentration. The results suggested that glucose consumption and succinic acid production were not directly influenced by the initial bacterial concentration respect to glucose concentration. But the best results were obtained at the ratio of bacteria:glucose equal to 1:1 and further tests will be necessary to implement succinic acid yield and productivity
A Critical Review on Downstream Process to Recovery Succinic Acid from Fermentative Broth
No full textSuccinic acid was a building block chemical of many industrial products, among these, one of the most interesting applications concerns the bioplastics market. This compound can be produced through the biotechnological routes, but several challenges still need to be addressed. One of the greatest challenges has been the downstream process to recover and purify succinic acid from the fermentative broth. Succinic acid must be taken from the fermentation broth, that was composed of various compounds, such as cellular residues, proteins, and other acids, to reach a recovery and a purity >90%, in order to be marketed. Generally, the downstream process can be divided into three phases: pretreatment, separation and purification. Several studies have been carried out on different technologies with the aim to improve recovery and purity. To date, all these methods were applied only on laboratory-scale, due to various critical issues that emerged, such as high costs, which prevented their application on an industrial scale. This review highlighted the best obtained results from the recent studies and discussed on critical aspects and future perspectives on the topic
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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