1,720,954 research outputs found
Electrochemical impedance spectroscopy wearable systems for reporting biomarker modulation in sweat
No full textThe commercial wearable device market today majorly consists of activity trackers and
smartwatches: that enable the monitoring of user states such as walking, sleeping, and exercising
using sensors relying on physically measurable quantities. These devices are the ones that make a
huge impact on the lives of people suffering from chronic illnesses and their quality of life.
Integrating a sweat-based electrochemical biosensor with a wearable device opens new avenues in
health management and decision support systems for healthcare providers as they can provide a
physiologically relevant and clinically acceptable output. Integrating a glucose-sensing sweat
biosensor adds more value in the lives of diabetics, who require support in terms of balancing
quality of life using good diet and exercise routines. This work is a methodology of understanding
the aspects of making such a wearable platform, starting from understanding the needs of the
wearable device user population. The current market technology is thoroughly studied to pick
relevant aspects and an electronic front end is designed within the bounds of good design practice
to enable good accuracy, ease of use, and 1-week battery life. This in turn is utilized to collect
human subject data to get an understanding of the performance of the sensors in varying environmental conditions and user states. Finally, mathematical modeling approaches are used to
build correlations between the outcome to be presented to the user against change in the recorded
data features as per the human subject experimentation
MEMS-CMOS Heterogenous Mixed Signal Circuit Design
No full textVarious mixed-signal circuits form an integral part of modern electronic systems, whether portable or bench-top in size. Power converters, data converters and communication circuits are the three major categories of mixed-signal circuit paradigm. Switching power converters have been an area of interest for power conversion with a large conversion ratio. These have been demonstrated to exhibit a high power efficiency and smaller size. The switches in such power converters are implemented using Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), however they are prone to various parasitic losses and leakages which in turn reduce the overall energy and area efficiency of the converter. Switch capacitor circuits have been in academic research since the late 1970s and have become a very important part of the data converter topology since the early 1990s. Accuracy and speed inevitably decides the figure of merit of such circuits. Thus, parasitic losses and leakages mar performance of these circuits.
In the recent years, Micro-ElectroMechanical (MEM) and Nano-ElectroMechanical (NEM) relays have been manufactured reliably and demonstrated to work in applications like combinational and sequential logic, memory and power management circuits. The primary interest behind using such relays is the zero leakage current and constant on resistance. There have also been explorations in the NEMS-CMOS heterogeneous integration and back-end-of-line (BEOL) NEMS integration on CMOS.
This dissertation explores aspects of hardware implementation of MEMS switches in various mixed signal circuits. Owing to a constant on resistance over a slewing gate voltage and infinite off resistance, it offers a new design perspective for low power mixed-signal designs. A charge pump is demonstrated to explore implementation constraints and efficiency of the switch when used in a power converter. For a data converter implementation, a switch capacitor voltage amplifier and a sample and hold amplifier is demonstrated to analyze the accuracy of the proposed implementation. MEMS switches show exceptional results in terms of area, power efficiency and accuracy when implemented in the aforesaid designs. However, certain restraints are shown based on commercially available switches and an attempt is made to overcome them
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
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