1,720,954 research outputs found
Performance Analysis of Visible Light Communication System for Free Space Optical Communication Link
No full textAbstractThe fast growth in gadgets usage and application developments has prompted many researchers to look beyond Wi-Fi. The possibility of using visible light for short range communication is explored by many researchers [1]. An intuitive acronym Li-Fi is used by many in contemporary literature to describe this concept. Light reaches almost all over the place, so communication can be done through light easily. By utilizing visible light as a transmission means, Li-Fi provides wireless indoor communication. Since the switching speed of Light Emitting Diode is less than 1μs, they can be turned on and off rapidly, so human eye cannot identify any flickering, thus the light source seems to be persistent. This imperceptible on-off action permits information transmission utilizing binary codes. Turning on LED is a binary’1’, turning it off is a binary’0’. It is possible to get sequence of 1s and 0s by adjusting the LEDs flickering rate. A photo detector can be used to recover the original data. This method of wireless transmission of information using rapid pulses of light is cited as Visible Light Communication. Its ability to challenge conventional Wi-Fi has roused the interest in Li-Fi. A study to analyze the performance of visible light communication system in optical wireless communication has been made and achieved a data rate of 10 kbps over 40cm distances
Comparison of HRV Indices of ECG and BCG Signals
Full text linkElectrocardiography (ECG) plays a significant role in diagnosing
heart-related issues, it provides, accurate, fast, and dependable insights into
crucial parameters like QRS complex duration, the R-R interval, and the
occurrence, amplitude, and duration of P, R, and T waves. However, utilizing
ECG for prolonged monitoring poses challenges as it necessitates connecting
multiple electrodes to the patient's body. This can be discomforting and
disruptive, hampering the attainment of uninterrupted recordings.
Ballistocardiography (BCG) emerges as a promising substitute for ECG,
presenting a non-invasive technique for recording the heart's mechanical
activity. BCG signals can be captured using sensors positioned beneath the bed,
thereby providing enhanced comfort and convenience for long-term monitoring of
the subject. In a recent study, researchers compared the heart rate variability
(HRV) indices derived from simultaneously acquired ECG and BCG signals.
Encouragingly, the BCG signal yielded satisfactory results similar to those
obtained from ECG, implying that BCG holds potential as a viable alternative
for prolonged monitoring. The findings of this study carry substantial
implications for the advancement of innovative, non-invasive methods in
monitoring heart health. BCG showcases the ability to offer a more comfortable
and convenient alternative to ECG while retaining its capacity to deliver
accurate and reliable cardiac information concerning a patient's condition.Comment: 8 Pages, 6 Figures, International Journal of Modern Trends in
Engineering and Researc
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
Improving Language Acquisition in Sensory Deficit Individuals with Mobile Application
No full textAbstractThis paper discusses the problems faced by hearing impaired individuals in India and the use of technology to make their interaction easier. World over sign language is used for interaction among hearing impaired people. Sign language is developed and standardized in many developed nations like United States of America, United Kingdom etc. This has resulted in American Sign Language (ASL), British Sign Language (BSL) respectively. Language acquisition is a major requirement during the initial development stage of a sensory deficit subject. The language skills help an individual's ability to express self, aids cognitive skills and thought process. In India the pedagogy based on Indian Sign Language (ISL) is developing. Language learning using a multimedia based application is found helpful for sign language users. This paper discusses the development of a mobile application for sensory deficit people for language acquisition. An Android based learning system for hearing impaired individuals, which translate text to Indian sign language videos and images are developed
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
Performance Improvement of Multicarrier Systems Using Wavelet Filter Banks
No full textAbstractThe need for higher data rates with increased bandwidth efficiency has focussed the search for techniques which deliver better results than conventional Orthogonal Frequency Division Multiplexing (OFDM) system. A wavelet filter bank system is investigated as a multicarrier modulation system (MCM). Such a system is found to be flexible, efficient and has many advantages over the present OFDM systems. This paper deals with identifying the suitability of different wavelet families, which can be used to improve the performance parameters of existing systems. Different wavelets families Daubechies, Meyer and Battle-Lemarie, are used as filter coefficients for wavelet based OFDM system and it is found that Daubechies wavelet (Db4) based multicarrier system outperforms the other two
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