1,720,959 research outputs found
SHSC: Non-Isolated High-Density 4:1 IBC For 48 V Applications
No full textThe rack-level 54/48 V bus architecture is an established standard in modern Data Centers, both in classical server applications and accelerator boards. The digital load supply (xPU/ASIC) is almost always provided through a Voltage Regulator Module (VRM), which is a multi-phase buck converter implementing the last stage of the power conversion. With modern technology, Voltage supply for the VRM is at its sweet spot between 6 V and 12 V, enabling the use of wide-spread, commercial power stages. To provide this Voltage rail to the VRM, a first stage connected to the 48 V bus is needed (Intermediate Bus Converter - IBC): as regulation is provided with high performance by the VRM, the IBC can be unregulated to enable very high power density. In this work the Authors present an unregulated, non-isolated 4:1 fixed-ratio Hybrid Switched Capacitor converter called SHSC. Detailed operation is shown, together with experimental results for a 40x18x8 mm discrete implementation providing up to 1.3 kW with a power density of 3.7 kW/in
Novel TLVR Operation In Multi-Stage Voltage Regulator Module With Current Multipliers
No full textAI applications in data centers are quickly advancing, leading to a surge in the development of new hardware accelerators for Machine Learning (ML), Deep Learning (DL), and High-Performance Computing (HPC). These new devices have high power demands, thereby assigning data centers a critical role in global power consumption. Updated regulations and technological improvements, including on efficiency, will be crucial to moderate the surge in energy consumption from data centers. The power conversion chain is crucial for maximizing overall system efficiency. This paper introduces an innovative power conversion architecture that employs a multi-stage approach to ensure high efficiency and a rapid transient response, thereby enhancing Power Density and Power Delivery Network (PDN) performance
Boosting efficiency in resonant converters by the use of a new advanced power MOSFET technology
No full textHigh-Performance Current Multiplier: a Hybrid Switched Capacitor Solution For High-Current Applications
No full textThe rapid growth of AI applications in data centers has led to a surge in the development of new hardware accelerators, resulting in increased power demands and energy consumption. To ensure this trend remains feasible and sustainable, it is crucial to focus on enhancing efficiency, especially within the energy conversion chain. The key enablers for achieving this objective include the precise integration of topology and magnetic structure, as well as the implementation of advanced 3D designs to enhance two critical parameters: efficiency and current density. This paper introduces a compact ultra-low profile Current Multiplier module, exploiting the advantages offered by the Hybrid Switched Capacitor (HSC) topology. Experimental results show the effectiveness of the topology achieving Electrical Current Design (EDC) density of 2.2 A/mm
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
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