1,354,348 research outputs found
Low latency data retrieval solutions for big data
No full textAs applications are moving towards peta and exascale data sets, it has become increasingly important to develop more efficient data retrieval and storage mechanisms that will aid in reducing network traffic, server load, as well as minimizing user perceived retrieval delays. We propose an Intelligent Caching technique and a Graph Summarization technique in order to achieve low latency data retrieval for big data based applications.
Our caching approach is developed on top of HDFS to optimize the read latency of HDFS. HDFS is primarily suitable for Write Once Read Many (WORM) applications where the number of reads is significantly more than that of writes. In our Intelligent Caching approach, we analyze real world map reduce traces from Facebook and Yahoo in terms of file size and access pattern distribution. We combine it with the existing analysis from literature to develop a new caching algorithm that builds on top of the HDFS caching API recently released. Based on the findings that a majority of accesses in a map reduce cluster occur within the first 2 hours of file creation, our caching algorithm uses a sliding window approach to ensure that most popular files remain in cache at appropriate time instances. It uses file characteristics for a particular window to determine a file's popularity. File popularity is calculated using file access patterns, file age and workload characteristics. We use a simulator based technique to evaluate our algorithm on various performance metrics by using real world and synthetic traces. We have compared our algorithm with some of the existing variants of LRU/LFU.
Recent rapid growth in real-world social networks has incentivized researchers to explore optimizations which can provide quick insights about the network. Due to this motivation, graph summarization and approximation has been an important research problem. Most of the work in this area has been focused on concise and informative representations of large graph. These large graphs are billion nodes and edges graphs and need a distributed storage/processing system for any kind of operations on them. Our work primarily focuses on task-based summarization of large graphs that are stored in a distributed fashion and answer queries which are computationally expensive on original graph, but have tolerance with regards to minor errors in exact results. These queries, semantically, provide the same amount of information even with approximate results. Our contribution is a distributed framework which can answer queries probabilistically in a highly efficient way using compact representations of original graph stored in form of summary graphs across a cluster of multiple nodes. These summary graphs are also optimized for space complexity, and only grow in terms of the number of attributes used to answer the query. One can then use a combination of these graphs to answer complex queries in an extremely efficient manner. Our results are promising and show that significant gains in runtime can be achieved using our framework without sacrificing too much on accuracy. In fact, we observe decreasing trend in error as the graph size increases.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2018-05-01The student, Chaitanya Datye, accepted the attached license on 2016-04-25 at 11:29.The student, Chaitanya Datye, submitted this Thesis for approval on 2016-04-25 at 11:46.This Thesis was approved for publication on 2016-04-25 at 15:49.DSpace SAF Submission Ingestion Package generated from Vireo submission #9464 on 2016-07-07 at 14:17:59Made available in DSpace on 2016-07-07T21:18:02Z (GMT). No. of bitstreams: 2
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Previous issue date: 2016-04-25Embargo set by: Seth Robbins for item 93310
Lift date: 2018-07-07T21:18:16Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 93310 on 2018-07-08T09:15:20Z
Improved surface quality and fatigue life of high-strength, hybrid particle reinforced (Ti+B4C)/Al-Cu-Mg metal matrix composite processed by dual-laser powder bed fusion
No full textHigh surface roughness observed in the as-built condition is still a limiting factor for metal parts processed by laser powder bed fusion (L-PBF). This is mainly due to the highly degrading effect of poor surface quality on fatigue performance. As a promising in-process alternative, the dual-laser powder bed fusion (dL-PBF) technique has recently been proven to increase the surface quality and fatigue life of L-PBF metal parts with up-facing inclined surfaces, reducing the need for additional post-treatments. This paper shows the beneficial effect of dL-PBF on the three-point bending fatigue life of lightweight high-strength hybrid particle reinforced (Ti+B4C)/Al-Cu-Mg metal matrix composite coupons, while comparing the dL-PBF processed to the as-built (AB), electric-discharge machined (EDM) and conventionally machined (milled) conditions. The effect of different surface conditions on several fatigue-influencing factors, i.e., surface roughness and concomitant roughness-induced stress concentration factor, surface residual stress, and hardness is discussed, as well as the resultant fatigue performance. The 73 % surface roughness reduction is identified as the major dL-PBF-influenced factor, leading to significantly enhanced fatigue life values that approach those of conventionally machined surfaces
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
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
The Thursday Murder Club: Launching a megabrand author - a publishing case study
No full textIn 2020, the Christmas book charts in the UK made headlines: Barack Obama’s eagerly awaited autobiography, The Promised Land, was beaten to the top spot by The Thursday Murder Club by Richard Osman, a debut cosy crime novel set in a retirement village. Not only did Osman’s book beat the former US president’s expected bestseller, it also broke records, becoming the fastest-selling debut crime novel of all time. Although Osman has a certain level of fame in the UK from his TV appearances on shows such as Pointless, his celebrity status does not entirely explain the novel’s huge sales. This article tracks the acquisition, publication, and promotion journey of The Thursday Murder Club in order to understand the industry and cultural context of its success and to interrogate the role of celebrity in the creation of author brands. The findings suggest that the unexpected scale of the success of the book owed to a number of factors, including in-depth editing by the novel’s agent, editor, and author to tighten up the plot, an extensive and strategic promotional campaign, the pandemic (which drove interest in the book’s genre and themes), and the quality of the writing. We find that the book’s success was accentuated by Osman’s celebrity status rather than being entirely reliant on it. This research adds to the growing scholarship on celebrity authorship by means of an in-depth case study and provides insight into the processes behind publishing a ‘celebrity’ book and launching a megabrand author
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
The vanishing author in computer-generated works: a critical analysis of recent Australian case law
No full textAbstract
The use of software is ubiquitous in the creation of many copyright works, yet the requirement in copyright law that every work have a human author who engages in independent intellectual effort means that its use may prevent copyright subsistence. Several recent Australian cases have refocused attention on authorship as an essential criterion of copyright subsistence, and these cases suggest that much computer-produced output may be authorless and thus lack copyright protection. This article, the first in a two-part series, analyses how each case deals with the question of authorship of computer-produced works and why the use of software diminishes copyright protection for a significant number of computer-generated works. The article critiques the application of conventional notions of human authorship developed in the pre-computer age to modern productions and suggests alternative approaches to authorship that satisfy both the major objectives of copyright policy and the need to adapt to the computer age. The article argues that, without a broader judicial approach to authorship of computer-generated works, Parliament must remedy the lacuna in protection for these ‘authorless’ works. Possible solutions for reform are suggested. In a forthcoming article, the author comprehensively examines those reform proposals
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