1,721,068 research outputs found
FD SOI Hall Sensor Electronics Interfaces for Energy Measurement
No full textThis paper presents a SOI Hall sensor based microsystem for energy measurement. The mixed-mode signal circuitry has been entirely
designed and integrated in the experimental 0.5 mm fully depleted SOI 3V technology. It consists of an integrated Hall element, chopper
stabilized sensor bias system, analog front end and digital back end. Aiming at performing accurate measurements, we have implemented
a high linearity analog front end, as well as a high-resolution analog-to-digital conversion technique. Two versions of the microsystem
have been realized. The first test chip contains a classical instrumentation amplifier as sensor amplifier, whereas the second one contains a
linearized differential-difference amplifier as sensor amplifier. Both microsystems are fully functional and permits one to perform the
measurements with an overall system error that is less than 71.5%
SOI Hall Sensor Based Solid State meter for Power and Energy Measurements.
No full textGrowing demand for the solid state meters for power and energy measurement leads to the fully integrated Hall sensor based microsystem solutions. In this paper we describe fully integrated SOI Hall sensor based microsystem for power and energy measurements with dynamic offset cancellation. Since Hall sensor behaves like a natural four quadrant multiplier it is used to multiply the line voltage and current giving the output voltage proportional to the instantaneous power. Furthermore, voltage at the Hall output is proportional to the line active power and can be further processed. By converting the sensor output voltage to digital signal using a sigma-delta demodulator followed by a digital filtering, the energy consumption is observed at the end of the processing chain. The entire microsystem has been designed for high linearity and resolution, and integrated in 0.5 mu m FD SOI process
Microelectronic System for Hall Sensor Power Measurements.
No full textA new integrated architecture for power measurements is proposed. The system includes the Hall sensor bias circuit and its front-end voltage amplifier. The implemented architecture performs the conversion of the electrical power into a Hall voltage, which is then amplified by a Differential Difference Amplifier (DDA). The architecture shows low power consumption and an optimized area however its resolution is drastically limited by the sensor offset and the linearity of the DDA. In order to achieve higher resolution, a second system is also proposed where a dynamic offset cancellation is employed in the bias scheme in order to reduce both the sensor and the electronics offset. To improve the sensor amplifier stage, a linearized version of the DDA is used. The latter architecture appears to be very promising and a linearity of 16-bit is achieved. Both simulations and measurements results from the comparison between the two architectures are shown in this paper
Prevalance study of glaucoma in Malta and Gozo
Full text linkA glaucoma survey was carried out in Malta and Gozo. Using non-contact pulseair tonometer, 2245 participants selected on a random basis, aged 40 years and above, were examined and 3.29% were found to have glaucoma. Among them 1.69% were newly detected glaucoma cases. The main risk factors were diabetes mellitus in the personal past history and glaucoma in the family history. Age was confirmed to be a risk factor, but arterial hypertension and myopia could not be proved as risk factors. About 4000 glaucoma cases were estimated to be present in Malta and Gozo at the time of the survey. Some other ocular conditions were also found in relatively high percentages: cataract -3.3%, myopic maculopathy -2.9% and diabetic retinopathy -1.5%.peer-reviewe
SOI Hall Sensor Electronics Interface for Energy Measurement with Dynamic Offset Compensation
No full text
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
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