1,720,969 research outputs found
Querying By Humming System： Improved Onset Detection and Modified Melody Matching
No full text近幾年, 音樂檢索的技術開始被深入的研究。傳統上，我們使用歌名或歌手等以文字為基礎的方式來進行音樂檢索。然而，假如我們忘記歌名跟歌手等文字線索那要怎麼辦呢？因此，接下來我們將介紹一個新穎的觀念，利用歌曲中的旋律內容來進行檢索。哼唱詢問(QBH)是人們跟電腦透過網際網路進行音樂搜尋的互動式觀念，而在一個龐大的音樂資料庫底下，此搜尋結果需要快速的搜尋時間。
大致上來說，我們嘗試著取出一段哼唱旋律的音頻並且比較其音頻在音樂資料庫的最大相似度。在資料庫中，高相似度的曲目將會被列出並且依照相似度由高往低排列。這篇論文將會介紹發端識別，音頻偵測，以及旋律比對的演算法。然而，由人們產生的歌聲總是不完美的，因此，仍然有許多困難之處留待我們去解決和改善。每一個人有不同的演唱方式且會導致各種不同型態的聲音波形，像是音調的高低，音準的準確性，尾音哼唱方式，演唱方式等等..，而這些因素也造成發端識別上的困難。
因此，在這篇論文中，我們主要提出了三種改善哼唱詢問(QBH)的方式，一種是針對發端識別做改善，而另外兩種則是針對旋律比對做改善，此外，在音頻偵測的方面，我們也採用了自己的方式。
最後，未來的研究應該更致力於改善哼唱詢問的效能，使它針對不同演唱風格的情況下能更具可適性以及信賴性。另外，在進行旋律比對方面上，我們要求更快的搜尋時間以及較低的複雜度，特別是在一個龐大的音樂資料庫底下。Music retrieval techniques have been investigated in recent years. Typically, we use the names of singers or songs as retrievals. However, how do we search songs when we forget the names of singers and songs? Hereunder, we will introduce a novel concept for music retrieval searching by using any melodic passage of a song. ‘Querying by humming’ (QBH) is a interaction concept for people to interact with computer through internet, and the searching results are revealed fast and orderly by comparing the sung input with a large database of known songs.
Generally speaking, we try to extract a series of the pitches form the humming input by a single individual, and compare these pitches with pitch interval of the known musical database. Melodies (theme) of the database are similar to the sung input are retrieved and listed orderly depending on its similarity score. This paper will present the algorithm for note onset detection (event detection), pitch detection, pitches quantization, melody encoding and melody matching (similarity matching or pattern matching).
However, Human reproduction of melodies is always imperfect, therefore, there are many difficulties for us to overcome and improve. Every individual has different singing style that results as a variety of patterns of sung inputs that make note onset detection become more difficult. Besides, the accuracy rate of onset detection also influences the performance of melody matching.
Therefore, in this thesis, we mainly proposed three methods to improve the QBH system, one is for improving onset detection and other two are for improving melody matching. Besides, we use our own method to extract the fundamental frequency.
For that, future research should make an effort to improve event detection, making it more adaptive and reliable to deal with various situations. Furthermore, research on measuring similarity between melodies in database and sung theme need to be further pursued to reduce the computation time and complexity while the amounts of musical database have been exploding nowadays
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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