1,720,954 research outputs found
Investigation of DC and AC Characteristics in Gate-All-Around Field-Effect Transistor Using the Non-equilibrium Green’s Function Approach
No full textElectron transport simulation plays a pivotal role in understanding and predicting the performance of electronic devices. In both industry and academia, Technology Computer-Aided Design (TCAD) is commonly used for device simulation. Additionally, the Multi-Subband Boltzmann Transport Equation (MSBTE) is often employed to incorporate physical aspects of electron transport. However, as device dimensions continue to scale down, quantum effects become increasingly significant. To address these quantum effects, quantum transport simulations have been widely adopted, with the Non-Equilibrium Green’s Function (NEGF) method serving as a standard approach. Over the years, NEGF has evolved to involve complex band structures, improve computational efficiency, and integrate various physical models. It is now widely used in electron transport simulations and frequently serves as a benchmark for validating other transport models. Despite its advancements, NEGF still faces several limitations. One such limitation is that it has traditionally been restricted to DC simulations, whereas TCAD and MSBTE are already capable of AC and transient analyses. AC simulation is particularly important for extracting parameters such as Y-parameters and cutoff frequency, and it also serves as a prerequisite for noise analysis. Another limitation is that NEGF does not deterministically account for the effect of surface roughness. This thesis aims to address these limitations. Chapter 1 provides a brief introduction to device simulation and the NEGF method. Chapter 2 introduces conventional DC NEGF simulation, outlining the governing equations and typical simulation procedure. Chapter 3 presents a fully coupled scheme in which the Poisson equation and NEGF are combined into a single system matrix and solved simultaneously. As a result, the number of iterations required for convergence can be reduced. Moreover, the proposed fully-coupled scheme provides the capability of AC NEGF simulation. In chapter 4, the implementation of AC NEGF is described, extending NEGF’s capabilities beyond DC analysis. The accuracy of the AC NEGF implementation is validated, and current conservation is examined. Subsequently, AC simulations are performed to extract Y-parameters and cutoff frequencies. Plasma instabilities induced by ungated regions are investigated using the AC NEGF approach. In addition, the AC NEGF simulation is extended to include electron-phonon scattering, and the corresponding results were analyzed. Chapter 5 presents NEGF simulations incorporating the mode coupling effect which may be induced by the surface roughness. Mode coupling is represented as a scattering process via this mathematically derived model. The derivation of the proposed geometric scattering model is introduced. The proposed model is validated through the simulation and discussion is provided.Doctor1. Introduction 1
1.1 Device development 1
1.2 Transport simulation 3
1.2.1 Technology Computer-Aided Design 3
1.2.2 Non-equilibrium Green’s function 4
1.3 Organization 6
2. Conventional DC NEGF Simulation Framework 8
2.1 Poisson equation 9
2.2 Schrödinger equation 10
2.3 NEGF framework 11
2.3.1 Real-space NEGF 12
2.3.2 Mode-space NEGF 16
2.4 NEGF simulation procedure 20
2.5 DC NEGF simulation result 23
2.6 Conclusion 25
3. Fully-Coupled Scheme for NEGF Simulation 26
3.1 Fully-coupled scheme 27
3.2 Simulation result 32
3.3 Conclusion 41
4. AC NEGF simulation 42
4.1 AC NEGF approach 43
4.1.1 Relations for AC NEGF simulation 44
4.1.2 Solution procedure for AC NEGF simulation 48
4.1.3 Response calculation 50
4.1.4 Simulation results and discussion 53
4.2 AC NEGF including electron-phonon scattering 64
4.2.1 Methodology 64
4.2.2 Implementaion 67
4.2.3 Simulation result 71
4.3 Conclusion 74
5. Describing Geometric Fluctuation as a Scattering 76
5.1 Derivation 77
5.2 Approximated form 81
5.3 Simulation procedure and result 82
5.4 Discussion 86
Summary 88
References 91
Acknowledgements 10
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
- …
