1,721,823 research outputs found
Electricity in South Australia: cost, price and demand 1950-80 /Abul Asad Ali Ahmed Rushdi
No full textBibliography: leaves 350-383xx, 383 leaves : ill ; 30 cm.Thesis (Ph.D.)-- University of Adelaide, Dept. of Economics, 198
Use of web page credibility information in increasing the accuracy of web-based question answering systems / Asad Ali Shah
Full text linkQuestion Answering (QA) systems offer an efficient way of providing precise answers to questions asked in natural language. In the case of Web-based QA system, the answers are extracted from information sources such as Web pages. These Web-based QA systems are effective in finding relevant Web pages but either they do not evaluate credibility of Web pages or they evaluate only two to three out of seven credibility categories. Unfortunately, a lot of information available over the Web is biased, false and fabricated. Extracting answers from such Web pages leads to incorrect answers, thus decreasing the accuracy of Web-based QA systems and other system relying on Web pages. Most of the previous and recent studies on Web-based QA systems focus primarily on improving Natural Language Processing and Information Retrieval techniques for scoring answers, without conducting credibility assessment of Web pages.
This research proposes a credibility assessment algorithm for evaluating Web pages and using their credibility score for ranking answers in Web-based QA systems. The proposed credibility assessment algorithm uses seven categories for scoring credibility, including correctness, authority, currency, professionalism, popularity, impartiality and quality, where each category consists of one or more credibility factors. This research attempts to improve accuracy in Web-based QA systems by developing a prototype Web-based QA system, named Optimal Methods QA (OMQA) system, which uses methods producing highest accuracy of answers, and improving the same by adding a credibility assessment module, called Credibility-based OMQA (CredOMQA) system. Both OMQA and CredOMQA systems have been evaluated with respect to accuracy of answers, using two quantitative evaluation metrics: 1) Percentage of queries correctly answered and 2) Mean Reciprocal Rank evaluation metrics. Extensive quantitative experiments and analyses have been conducted on 211 factoid questions taken from TREC QA track from 1999, 2000 and 2011 and a random sample of 21 questions from CLEF QA track for comparison and conclusions.
Results from methods and techniques evaluation show that some techniques improved accuracy of answers retrieved more than others performing the same function. In some cases, combination of different techniques produced higher accuracy of answers retrieved than using them individually.
The inclusion of Web pages credibility score significantly improved accuracy of the system. Among the seven credibility categories, four categories including correctness, professionalism, impartiality and quality had a major impact on accuracy of answer, whereas authority, currency and popularity played a minor role. The results conclusively establish that proposed CredOMQA performs better than other Web-based QA systems. Not only that, it also outperforms other credibility-based QA systems, which employ credibility assessment partially.
It is expected that these results will help researchers/experts in selecting Web-based QA methods and techniques producing higher accuracy of answers retrieved, and evaluate credibility of sources using credibility assessment module to improve accuracy of existing and future information systems. The proposed algorithm can also help in designing credibility-based information systems in the areas of education, health, stocks, networking and media, requiring accurate and credible information, and would help enforce new Web-publishing standards, thus enhancing overall Web experience
Improved impedance/admittance switching controller for the interaction with a variable stiffness environment
Full text linkHybrid impedance/admittance control aims to provide an adaptive behavior to the manipulator in order to interact with the surrounding environment. In fact, impedance control is suitable for stiff environments, while admittance control is suitable for soft environments/free motion. Hybrid impedance/admittance control, indeed, allows modulating the control actions to exploit the combination of such behaviors. While some work has addressed the proposed topic, there are still some open issues to be solved. In particular, the proposed contribution aims: (i) to satisfy the continuity of the interaction force in the switching from impedance to admittance control when a feedforward velocity term is present; and (ii) to adapt the switching parameters to improve the performance of the hybrid control framework to better exploit the properties of both impedance and admittance controllers. The proposed approach was compared in simulation with the standard hybrid impedance/admittance control in order to show the improved performance. A Franka EMIKA panda robot was used as a reference robotic platform to provide a realistic simulation
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
Forecasting selectivity of Au-based partial oxidation catalysts via temperature programmed desorption studies on the Au(111) model catalyst
No full textCataloged from PDF version of article.Includes bibliographical references (leaves 81-86).Gold-based heterogeneous catalysts have attracted significant attention due to their selective
partial oxidation capabilities which are comparable to that of the industrial homogeneous
benchmark catalysts. In the current study, a planar Au(111) single crystal model catalyst surface
was utilized to understand the behavior of different organic compounds (alcohols, aldehydes,
esters etc.) in conjunction to the partial oxidation reactions. Stability of different organic
compounds were investigated on the Clean Au(III) surface. The stability of a particular organic
compound on the Au(III) model catalyst surface was found to be closely related to the variety of
generated products. Surface sensitive analytical techniques such as Temperature Programmed
Desorption (TPD) and Low Energy Electron Diffraction (LEED) were used to investigate the
interaction of organic compounds with the clean Au(111) single crystal surfaces under ultrahigh
vacuum (UHV) conditions. Organic compounds were dosed onto atomically clean Au(III)
surfaces at the liquid nitrogen temperature. All organic compounds desorbed non-dissociatively
on the clean Au(111) surface. All organic compounds reveal monolayer and multilayer
desorption signals but in the case of aldehydes, desorption is quite different, as they lead to
polymerization on the surface with high desorption temperatures. Zeroth order desorption
kinetics was observed for multilayers, while 1st order desorption was seen for the monolayer. In
most cases, the multilayer feature can be observed with two distinct desorption peaks
associated with amorphous and crystalline phases. In this work, it is confirmed that majority of
the studied compounds have relatively low adsorption energies on Au(111). The species with
lower desorption energies on Au(111) tend to undergo partial oxidation rather than total
oxidation. Thus, desorption energy appears as an important descriptor for predicting the extent
of oxidation in partial/total oxidation in oxidative coupling reactions.by Shah, Syed Asad Ali
sj-docx-1-whe-10.1177_17455057231213270 – Supplemental material for A rare case of Swyer syndrome from Pakistan in a young girl with primary amenorrhea and 46XY genotype
No full textSupplemental material, sj-docx-1-whe-10.1177_17455057231213270 for A rare case of Swyer syndrome from Pakistan in a young girl with primary amenorrhea and 46XY genotype by Inshal Jawed, Ayesha Azhar Javed, Syeda Alisha Johar, Daayl N Mirza, Ayesha A Abdani and Asad Ali Khan in Women’s Health</p
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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