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A Study on Slot Synchronization of W-CDMA System in Very High Mobility Environment
No full text本篇論文討論在超高速的移動通道環境下，由於W-CDMA系統中時間槽同步的正確率會因為通道的同調時間縮短與都卜勒偏移的效應而降低，因此本研究針對不同的通道環境模型提出對應的改善方法。在單路徑通道中，本文提出新的同步演算法，並模擬證明新演算法正確率表現得比傳統要好。接著探討多重路徑的衰減通道，本文提出新的同步碼傳送格式，並模擬證明新傳送格式可以改善在多重路徑通道的正確率表現，之後利用鐵路軌道固定的特性，提出補償高速通道的架構，並在模擬實驗中證明此架構可以幫助時間槽同步的正確率提高。最後探討接收器分集效應與載波頻率偏移的問題，模擬證明接收器分集效應在超高速移動下，時間槽同步的正確率有著明顯的改善。另外因為載波頻率的偏移，原本提出的同步改善方法受到此影響，大幅地降低時間槽同步的正確率，本文提出的方法，在火車鐵路環境中用模擬證明能夠有效地改善了同步的正確率。誌謝............................................I
摘要..........................................III
第一章 緒論.....................................1
1.1 研究背景...................................1
1.2 超高速移動環境與通道模型架構...............2
1.2.1 台灣高速鐵路現況..........................2
1.2.2 高速鐵路的通訊系統架構....................3
1.2.3 通道模型..................................7
1.3 研究動機..................................13
1.4 論文架構..................................14
第二章 超高速移動環境下W-CDMA系統中時間槽同步的同步演算法探討.............................................15
2.1 W-CDMA系統簡介............................15
2.2 W-CDMA系統的時間槽同步....................19
2.3 傳統時間槽同步架構........................21
2.4 新提出的演算法架構........................26
2.5 演算法複雜度的分析........................29
2.6 小結......................................30
第三章 超高速移動環境下W-CDMA系統中時間槽同步的同步碼傳送格式(pattern)探討與都卜勒偏移補償效應............31
3.1 傳統時間槽同步傳送格式與在高速移動下的表現31
3.2 傳送格式文獻回顧..........................34
3.3 提出的新同步碼傳送格式及在高速環境下的表現35
3.4 軌道路徑預知的條件........................41
3.4.1 台灣高鐵平原區軌道特性...................42
3.4.2 都卜勒偏移補償...........................43
3.4.3 路徑預知的模擬實驗.......................44
3.5 小結......................................47
第四章 超高速移動環境下W-CDMA系統中時間槽同步的接收器分集效應與載波頻率偏移探討...........................49
4.1 接收器分集效應............................49
4.1.1 車廂接收器分集...........................49
4.1.2 接收分集在高速移動下的表現...............51
4.2 載波的頻率偏移效應........................59
4.2.1 傳送端與接收端的載波頻率偏移.............59
4.2.2 抵抗載波頻率偏移的文獻回顧...............60
4.2.3 新同步碼傳送格式在載波頻率偏移下的探討...62
4.3 小結......................................65
第五章 結論與未來研究方向......................67
5.1 結論......................................67
5.2 未來的研究方向............................68
參考文獻.......................................7
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
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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