1,721,019 research outputs found
Design of a Chatbot to Assist the Elderly
No full textNowadays, conversational agents are solutions that can provide a highly valuable addition to the existing healthcare services to assist the elderly in following their care plans and gradually changing adverse patterns of behaviour. Nevertheless, the development of a conversation agent in the healthcare domain presents several technical, design and linguistic challenges. In our paper, we describe a chatbot conversing with elderly persons, with age-related problems. Charlie, the name of our chatbot, has been designed to provide the elderly with companionship through innovative strategies based on gamification, active notifications, and promotion of self-compassion that can be explored for preventive mental healthcare. Moreover, Charlie can be used to monitor meaningful or anomalous situations that can affect aged people. To specify these situations in the paper we describe a web application that enables medical assistants and relatives to create rules that depend on data gathered by Charlie such as the number of required news, followed tips, completed games, but also biometrical data such as the number of steps made during the day, burned calories or the number of hours of sleep. To help caregivers in creating these rules, we are studying how to endow our web app with a recommendation service for predicting recurring anomalous situations and, accordingly, provide suggestions on which characteristics the elderly will have to change to improve their lifestyle
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
Petroleum residue upgrading with dispersed catalysts Part 2. Effect of operating conditions
No full textThe hydrotreatment of a petroleum residue in the presence of dispersed molybdenite was carried out within a wide range of operating conditions and catalyst loading. The effect of reaction severity as well as of molybdenum concentration on product distribution and quality was studied. Based on the experimental results, a simplified reaction scheme was proposed. The hydroprocessing of the residue was described in terms of the competition between two reactions: the direct conversion of the feedstock to distillate and coke, and the catalytic hydrogenation. Compared to thermal conditions, the presence of dispersed molybdenite controls very well coke formation; however, a trend of increasing formation of solids was observed at high catalyst concentrations. The overall upgrading of the feedstock requires significant amounts of molybdenum as well as relatively high hydrogen pressure
Novel alpha-nitroketonate nickel(II) complexes as homogeneous catalysts for ethylene oligomerization
No full textThe oxidative addition of alpha -nitroacetophenone (naph) to bis(cyclooctadienyl)nickel(0) [Ni(cod)(2)], in the presence or not of tricyclohexylphosphine (PCy3) was proven to give the eta (1),eta (2)-cyclooctenyl)(naph)nickel(II) complex (III). When this reaction was carried out in the presence of PCy3, further addition of methylalumoxane (MAO) or trialkylaluminium compounds afforded the corresponding alkyl(PCy3)(naph)nickel(II) complex. This was also obtained by an alternative synthetic procedure involving the addition of a trialkylaluminium to the equimolar adduct of Ni(naph)(2) with PCy3. When the above complexes, independently of the synthetic procedure adopted, were generated in situ by using MAO as a co-catalyst (Al/Ni=100), they resulted in being active in ethylene oligomerization. Whereas in the absence of PCy3, they gave mainly linear C-4-C-6 oligomers with turnover frequencies (TOFs) in the 4000-8000 h(-1) range, the presence of the phosphine ancillary Ligand not only produced a remarkable increase in activity (TOF=26,00012 1,000 h(-1)) but also afforded a completely different distribution of oligomers, mainly branched C-6-C-13 products being obtained. (C) 2001 Elsevier Science B.V. All rights reserved
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
Selective propylene dimerization to 2,3-dimethylbutenes by homogeneous catalysts prepared by oxidative addition of alpha-nitroketones to nickel(0) complexes in the presence of phosphine ligands and organoaluminium co-catalysts
No full textNovel nickel catalysts, prepared in situ by oxidative: addition of alpha -nitroketones to nickel(O) complexes, in the presence of a phophine ancillary ligand and activated by organoaluminium co-catalysts were investigated in propylene oligomerization with the aim to selectively obtain 2,3-dimethylbutenes (DMB). In particular, the effect of the nature of the alpha -nitroketonate ligand as well as of the basicity and bulkiness of the phosphine on catalyst performances were studied. Finally, the influence of the type of organoaluminium co-catalyst and reaction temperature were examined. In particular, when the Ni(cod)(2)/tricyclohexylphosphine (PCy3)/alpha -nitroacetophenone (naph)/methylalumoxane (MAO) catalytic system was employed, the highest up to now reported regioselectivity within C-6 cut (>90%) was achieved. Moreover, the use of balanced mixtures of MAO and Et2AlCl allowed to optimize the catalyst performances up to an overall yield to DMB of almost 70%, a significant productivity being also achieved (TOF = 4500 h(-1)). (C) 2001 Elsevier Science B.V. All rights reserved
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