1,720,953 research outputs found
A hybrid autotuning framework for performance optimization of heterogeneous systems
Full text linkLAUREA MAGISTRALELa crescente complessit`a del moderno design hardware multi e manycore rende l’ottimizzazione delle prestazioni delle applicazioni un compito difficile. Mentre l’aiuto della sintonizzazione automatica conclusa con successo `e stata la riduzione dei tempi di esecuzione, sono emersi i nuovi obiettivi di prestazione che comprendono il consumo di energia, il costo computazionale e l’area.
Gli approcci di ottimizzazione automatica spaziano dal relativamente non intrusivo (ad esempio, utilizzando le opzioni del compilatore) alle estese modifiche del codice che tentano di sfruttare specifiche caratteristiche architettoniche. Le tecniche intrusive spesso portano a modifiche del codice che non sono facilmente reversibili, il che pu`o avere un impatto negativo sulla leggibilitA ̃ , sulla manutenibilit`a e sulle prestazioni su diverse architetture.
Pertanto, sono necessari metodi piu` sofisticati in grado di sfruttare e identificare i trade-off tra questi obiettivi. Introduciamo una struttura di ottimizzazione ibrida per ottimizzare il codice per due criteri principali che si confrontano reciprocamente, ad es. Tempo di esecuzione e utilizzo delle risorse in diversi livelli, a partire dal codice sorgente originale fino ad un livello di sintesi di alto livello. Sono coinvolti diversi strumenti e ottimizzazioni efficaci, ovvero il framework OpenTuner per la creazione di autotuner di programmi multi-obiettivo specifici del dominio, il sistema di ottimizzazione empirica basato su Annotation chiamato Orio e uno strumento di sintesi di alto livello denominato LegUp sono i componenti di ottimizzazione del nostro framework . Il framework mira a migliorare sia le prestazioni che la produttivit`a attraverso una procedura semi-automatica.
La nostra catena supporta l’ottimizzazione del codice indipendente dall’ architettura e l’architettura specifica e pu`o essere adattata a qualsiasi architettura di piattaforma hardware. Dopo aver identificato i parametri di ottimizzazione dell’applicazione tramite OpenTuner, passiamo il codice an- notato come input a Orio che genera molte versioni ottimizzate e restituisce la versione con le migliori prestazioni. Inoltre, LLVM esegue un numero di passaggi di ottimizzazione in base al risultato di Orio e, infine, LegUp utilizzer`a l’output LLVM per la sintesi di una determinata piattaforma target aggiungendo le sue ottimizzazioni.
Dimostriamo che il nostro approccio automatizzato pu`o migliorare i tempi di esecuzione e l’utilizzo delle risorse su HLS attraverso diversi livelli di ottimizzazione.The increasing complexity of modern multi and many-core hardware design makes performance tuning of the applications a difficult task. While the aid of the successful past automatic tuning has been the execution time minimization, the new performance objectives have emerged comprise of energy consumption, computational cost, and area.
Automatic Tuning approaches range from the relatively non-intrusive (e.g., by using compiler options) to extensive code modifications that attempt to exploit specific architectural features. Intrusive techniques often result in code changes that are not easily reversible, which can negatively impact readability, maintainability, and performance on different architectures.
Therefore, more sophisticated methods capable of exploiting and identifying the trade-offs among these goals are required. We introduce a Hybrid Optimization framework to optimize the code for two main mutually competing criteria, e.g., execution time and resource usage in several layers starting from the original source code to a high-level synthesis level. Several effective tools and optimizations are involved, i.e., OpenTuner framework for building domain-specific multi-objective program autotuners, Annotation-based empirical tuning system called Orio, and a high-level synthesis tool named LegUp are the optimization components of our framework. The framework aims at improving both performance and productivity over a semi-automated procedure.
Our chain supports both architecture-independent and architecture-specific code optimization and can be adapted to any hardware platform architecture. After identifying the application’s optimization parameters through OpenTuner, we pass the annotated code as input to Orio which generates many tuned versions and returns the version with the best performance. Furthermore, LLVM performs a number of optimization passes according to the Orio’s result and finally, LegUp will use the LLVM output to synthesis for a particular target platform adding its optimizations.
We show that our automated approach can improve the execution time and resource usage on HLS through different optimization levels
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
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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