1,721,006 research outputs found
NFT price and sales characteristics prediction by transfer learning of visual attributes
No full textNon-fungible tokens (NFTs) are unique digital assets whose possession is defined over a blockchain. NFTs can represent multiple distinct objects such as art, images, videos, etc. There was a recent surge of interest in trading them which makes them another type of alternative investment. The inherent volatility of NFT prices, attributed to factors such as over-speculation, liquidity constraints, rarity, and market volatility, presents challenges for accurate price predictions. For such analysis and forecasting, machine learning methods offer a robust solution framework. Here, we focus on three related prediction problems over NFTs: Predicting NFTs sale price, inferring whether a given NFT will participate in a secondary sale, and predicting NFT's sale price change over time. We analyze and learn the visual characteristics of NFTs by deep pre-trained models and combine such visual knowledge with additional important non-visual attributes such as the sale history, seller's and buyer's centralities in the trading network, and collection's resale probability. We categorize input NFTs into six categories based on their characteristics. Across detailed experiments, we found visual attributes obtained from deep pre-trained models to increase the prediction performance in all cases, and EfficientNet seems to perform the best. In general, CNN and XGBoost consistently outperformed the rest of them across all categories. We also publish our novel NFT dataset with temporal price knowledge, which is the first dataset to have NFT prices over time rather than at a single time point.Publisher versio
Transfer öğrenme görsel özellikleri ile NFT satış özellikleri ve fiyat tahmini.
No full textNon-fungible tokens~(NFTs) are unique digital assets whose possession is defined over a blockchain. NFTs can represent multiple distinct objects such as art, images, videos, etc. NFTs are almost always traded by using cryptocurrencies such as Ethereum and blockchains are utilized to encode them. There was a recent surge of interest in trading them which makes them another type of alternative investment. While the existing research predominantly focuses on the technical aspects of NFTs, limited attention has been given to predicting their prices. The inherent volatility of NFT prices, attributed to factors such as over-speculation, liquidity constraints, rarity, subjectivity, and market volatility, presents challenges for accurate price predictions. For such analysis and forecasting, machine learning methods offer a robust solution framework. Here, we focus on two related prediction problems over NFTs: Predicting NFTs' sale price, and inferring whether a given NFT will participate in a secondary sale. We analyze and learn the visual characteristics of NFTs by deep pre-trained models and combine such visual knowledge with additional important non-visual attributes such as the sale history, trader behavior, seller's and buyer's centralities in the trading network, and collection's resale probability, and we assess the reliability of these features. We categorize input NFTs into six categories based on their characteristic features: Art, Collectibles, Games, Metaverse, Utility, and Others. We train several different machine learning methods on these attributes to answer these two questions. Across detailed experiments, we found visual attributes obtained from deep pre-trained models to increase the prediction performance in all cases, even though the pre-trained model giving the optimal result may change depending on the problem type. In general, none of the learning algorithms consistently outperformed the rest of them across all categories. Our code is publicly available at https://github.com/seferlab/deep_nft.Nitelikli Fikri Tapu'lar (NFT'ler); temel olarak resimler, sanat eserleri, hareketli görseller ve mizahi tasarımlar gibi görselleştirilebilecek herhangi bir nesneyi temsil eden, mülkiyeti blok zinciri üzerinde tanımlanmış dijital varlıklardır. Genellikle Ethereum gibi kripto para birimleri ile çevrimiçi alınıp satılabilirler. NFT'lere ve ticaretine olan ilginin artışı, NFT'leri alternatif bir yatırım aracı haline getirmektedir. Ancak mevcut araştırma ve çalışmalar genellikle NFT'lerin teknik yönlerine odaklanmıştır ve fiyat tahminine yönelik çalışmalar sınırlı kalmıştır. NFT piyasasının karmaşık yapısı, spekülasyon ve manipülasyona açık olması, likidite eksikliği, nadirlik, öznellik ve volatilite gibi faktörler fiyat tahminini oldukça zor hale getirmektedir. Bu bağlamda, analiz ve tahminler için makine öğrenimi güçlü bir çözüm sunmaktadır. Bu çalışmada iki tahmin problemine odaklanılmıştır: NFT'lerin satış fiyatı ve ikincil satış olasılığı. Önceden eğitilmiş derin öğrenme algoritmaları kullanılarak NFT'lerin görsel özellikleri analiz edilmiş, bu görsel bilgi ile satış geçmişi, tüccar davranışı ve ikincil satışların fiyat üzerindeki etkisi de analiz ve öğrenme sürecine dahil edilmiş ve bu özelliklerin güvenilirlikleri değerlendirilmiştir. NFT'leri sanat, koleksiyon, oyun, metaverse, işlevsellik ve diğer olmak üzere 6 kategoriye ayırarak makine öğrenimi algoritmalarıyla satışlar modellenmiş ve bu problemlere cevap aranmıştır. Denemeler sonucunda, görsel özelliklerin tahmin performansını tüm durumlarda artırdığı, optimum performansı gösteren modelin ise problem tipine göre değiştiği görülmüştür. Genel olarak, öğrenme algoritmalarının hiçbiri tüm kategorilerde sürekli olarak diğerlerinden daha iyi performans gösterememiştir. Kodlarımız, https://github.com/seferlab/deep_nft adresinde herkese açık olarak sunulmuştur
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
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