1,720,964 research outputs found
NW Pacific-Panthalassa intra-oceanic subduction during Mesozoic times from mantle convection and geoid models
No full textGeodynamically modeled present-day mantle temperature and velocity field for Model R1a, R4a, 1a, 2a, 3a, and 4a
Where are the proto-South China Sea slabs? SE Asian plate tectonics and mantle flow history from global mantle convection modeling-Supplementary data
No full textPresent-day mantle thermal structure for Models 1a, 1b, 2a, and 2b predicted from geodynamic model
Cyclic Classifier Chain for Multilabel Classification
No full text本論文提出循環分類鍊(Cyclic Classifier Chain)，用以有效率地解決一個真實世界常見的問題--多標籤分類問題。循環分類鍊的想法是循環地訓練多個分類鍊(Classifier Chain)。這樣做可以降低標籤順序的影響，因為原本的分類鍊在訓練時，只能拿前面已經訓練完的標籤當作特徵加入訓練，而循環分類鍊可以讓分類器取得所有標籤的估計值。我們的實驗證明循環分類鍊在訓練過幾個循環後，就可以有效降低不同標籤順序對結果的影響，且結果比分類鍊好。受到壓縮篩選樹演算法(Condensed Filter Tree)的啟發，我們也把循環分類鍊擴展來通用地解決成本導向多標籤分類問題(cost-sensitive multiclass classification)。不同的問題有不同的成本計算方式是非常常見的，因此成本導向多標籤分類問題是個重要的問題。因為分類器在訓練時可以知道其他標籤，所以我們可以計算一個標籤被分類成各種可能的分類時的成本，再將這個成本嵌入在樣本的比重裡。 這個方法可以最小化任何基於單一樣本的成本，而我們的實驗也證明這樣做能比另一個成本導向的方法，機率分類鍊(Probabilistic Classifier Chain)還要好。而與壓縮篩選樹也不相上下，甚至略贏。為了讓預測更加穩定，我們還提出梯度增強(Gradient Boosting)版本的循環分類鍊。這方法比循環分類鍊好一點，也可以被有效率地訓練。我們也試著使用回歸樹(Regression Tree)當作基礎學習者，提出一個非線性的方法來解決通用成本導向多標籤分類問題。而壓縮篩選樹因為訓練的時間複雜度太高，所以較難用非線性方法來訓練。We propose a novel method, Cyclic Classifier Chain (CCC), for multilabel classification. CCC extends the classic Classifier Chain (CC) method by cyclically training multiple chains of labels. Three benefits immediately follow the cyclic design. First, CCC resolves the critical issue of label ordering in CC, and therefore reaches more stable performance. Second, CCC matches the task of cost-sensitive multilabel classification, an important problem for satisfying application needs. The cyclic aspect of CCC allows estimating all labels during training, and such estimates makes it possible to embed the cost information into weights of labels. Experimental results justify that cost-sensitive CCC can be superior to state-of-the-art cost-sensitive multilabel classification methods. Third, CCC can be easily coupled with gradient boosting to inherit the advantages of ensemble learning. In particular, gradient boosted CCC efficiently reaches promising performance for both linear and non-linear base learners. The three benefits, stability, cost-sensitivity and efficiency make CCC a competitive method for real-world applications
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
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