1,720,967 research outputs found
Overlay System Support for Information Dissemination
No full text由於資通訊產業的發展和社群網路的普及應用，使用者生成內容(UGC)的概念已然成為一種新的數位媒體內容生成的方式。而在各種資訊散播方式中，發布/訂閱模型(Publish/subscribe paradigm)是最適合做為使用者生成內容的資訊散播方式。因此在這篇論文中，我們探討了以疊層網路為基礎的資訊散播技術。我們對於三個在疊層網路上資訊散播的根本問題提出可行的解決方案。第一個問題是如何在網際網路中快速散播一個大檔案給多個訂閱者。針對此問題我們提出了Bee協定，在此協定中以縮小最大散播時間為最大考量，企圖使每一個訂閱者都能在短時間內接收到檔案。Bee協定是一個分散式的疊層網路架構，每一個節點只須知悉其鄰居節點的資訊就可以互助合作傳送檔案。模擬實驗結果顯示Bee協定可以在異質性網路中達到良好的最大散播時間，並且在Flash crowd pattern下依然能保持高速散播能力。第二個問題為在異質性網路中如何建構一棵疊層網路樹能最佳化整體系統的最大資訊散播時間。我們提出了一個新穎的LSBT模型來解決此最佳化問題。在LSBT模型中，對每一個上傳連線(Uplink)定義了一個基本傳送速率r，所有的節點只能用r的整數倍來散播檔案。基於LSBT模型，我們提出了一個O(nlog2n)的演算法來選擇最佳的傳送速率r並建構出一棵最佳的LSBT。模擬實驗結果顯示LSBT在最大資訊散播時間及時間複雜度上都遠勝目前最好的演算法。第三個問題如何建構一個高延展性及高效率的行動現狀資訊散播網路架構。行動裝置的普及讓社交網路應用服務已成為目前最重要和熱門的網路應用，也帶來了創新的網路營運模式。而社交網路服務中最為基礎的技術就是行動現狀資訊服務(Mobile Presence Service)，它必須讓使用者能及時的搜尋其朋友目前的現狀並通知朋友本身的現狀。因此我們針對需要面臨大規模使用者的社交網路服務設計了一個俱延展性及高效率的伺服器網路架構，稱為PresenceCloud。PresenceCloud俱備了高效率和高延展的搜尋演算法，其減少了搜尋現狀和通知朋友所需要的訊息量，並使現狀訊息傳遞所需的時間能保持在使用者可以接受的延遲。我們分析PresenceCloud並建構了模擬器來衡量其效能。實驗結果顯示PresenceCloud可以達成相當的搜索的滿意度和搜查效能。
本論文主要探索了三個以疊層網路為基礎的資訊散播根本問題，然而隨著使用者生成內容發展和應用的多樣化，資訊散播技術在網際網路的應用將會越來越重要，而各式各樣資訊散播的需求也會隨之而生。Since the rapid advances of ICT and the increasing popularity of social networking applications, User Generated Content (UGC) has become a new media content production circles (Web 2.0). The publish and subscribe paradigm is most suitable for the design principle of UGC applications. Thus we are interested in the issues of developing overlay architectures and techniques to support dissemination of information in publish and subscribe paradigms. Specifically, we focus on understanding and investigating the following fundamental questions of information dissemination on overlay systems Q1) How to rapidly disseminate a large-sized file to many subscribers in the Internet when the publisher releases the file? Q2) What is the relation between a single overlay tree with a fixed uplink rate and the broadcast operation itself, and how to construct a single overlay tree that minimize the maximum completion time in heterogeneous networks? Q3) Does there exist any other messages dissemination service that significantly outperforms those based distributed hash tables (DHT) both on scalability and efficiency for mutable and dynamic information, such as mobile presence messages?
To address the Q1), we present the Bee protocol, which is a best-effort peer-to-peer file delivery protocol aiming at minimizing the maximum dissemination time for all peers to obtain the complete file. Bee is a decentralized protocol that organizes peers into a randomized mesh-based overlay and each peer only works with local knowledge. We devise in Bee protocol a slowest peer first strategy to boost the speed of dissemination, and a topology adaptation algorithm that adapts the number of connections based on upload bandwidth capacity of a peer. Moreover, Bee is designed to support network heterogeneity and deal with the flash crowd arrival pattern without sacrificing the dissemination speed.
We then explore a novel model, named LockStep Broadcast Tree (LSBT), of big data broadcasting in heterogeneous networks for Q2). The main idea in our LSBT model is to define a basic unit of upload bandwidth, , such that each node uses only integer multiples of in broadcasting. We show that the optimal uplink rate of LSBT is either or in in homogeneous network environments. Then we present an O algorithm to select the optimal uplink rate and to construct an optimal LSBT for heterogeneous environments.
Finally, we examine the intrinsic scalability problem of server-to-server architectures for mobile presence services for Q3). To address the problem, we propose a scalable and efficient server architecture, called PresenceCloud, which enables mobile presence services to support large-scale social network applications. PresenceCloud organizes presence servers into a quorum-based server-to-server architecture for efficient presence searching. It also leverages a directed search algorithm and a one-hop caching strategy to achieve small constant search latency. We analyze the performance of PresenceCloud in terms of the search cost and search satisfaction level.
In summary, we make offers to study the three fundamental questions of overlay systems we mentioned for designing better information dissemination systems in publish and subscribe paradigms. However, the truth is that there is no one fit all solution for information dissemination services, future information dissemination services of publish and subscribe paradigms shall call for a generic, resilient, efficient and reliable platform for the demand of everyone in the Internet
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
No full textWe 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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