1,724,817 research outputs found
A Market-Based Approach to Recommender Systems
Full text linkRecommender systems have been widely advocated as a way of coping with the problem of information overload for knowledge workers. Given this, multiple recommendation methods have been developed. However, it has been shown that no one technique is best for all users in all situations. Thus, we believe that effective recommender systems should incorporate a wide variety of such techniques and that some form of overarching framework should be put in place to coordinate the various recommendations so that only the best of them (from whatever source) are presented to the user. To this end, we show that a marketplace, in which the various recommendation methods compete to offer their recommendations to the user, can be used in this role. Specifically, our research is concerned with the principled design of such a marketplace (including the auction protocol, the reward mechanism and the bidding strategies of the individual recommender agents) and its evaluation in terms of how it can effectively coordinate multiple methods. In addition to the market mechanisms, a reinforcement learning strategy is developed to assist the individual recommender agents' bidding behaviour so as to learn the users' interests and still maximize their revenue. Finally, we evaluate our approach with a real market-based recommender system that is composed of a number of typical recommendation methods and that is evaluated with real users. The evaluation results show that our approach is indeed an effective means of coordinating multiple different recommendation methods in one single system and is an effective way of dealing with the problem of information overload
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
Supplementary_Material - Novel flame retardancy effect of phenethyl-bridged DOPO derivative on epoxy resin
No full text
Supplementary_Material for Novel flame retardancy effect of phenethyl-bridged DOPO derivative on epoxy resin by Wei Yan, Jie Yu, Mingqiu Zhang, Lijuan Long, Tao Wang, Shuhao Qin and Weijiang Huang in High Performance Polymers
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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
Effect of particle size on β-glucan content, antioxidant and anti-inflammatory properties of Pleurotus floridanus / Wong Wei Yan
No full textCellular damage caused by high concentrations of free radicals can lead to chronic health problems. Pleurotus floridanus is an edible white oyster mushroom that contains high β-glucan with antioxidant and anti-inflammatory potential. In this study, β-glucan, total phenolic content, antioxidant and anti-inflammatory potential of hot water extract with different particles sizes which were <75 μm, 75-154 μm, 154-300 μm and 300-600 μm of the whole (AW) and sliced (AS) fruiting body of P. floridanus were analysed. All particle sizes of AS of P. floridanus extract have higher β-glucan content compared to AW. Results showed that β-glucan content increased as the particle size increased but no significant difference was observed. For the total phenolic content, particle size <75 μm of AW and AS of P. floridanus has the highest phenolic content. Antioxidant potential of P. floridanus extract was determined using DPPH (2,2-Diphenyl-1-picrylhydrazyl), ABTS (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) and ferric reducing antioxidant power (FRAP) assays. Each particle size of AW and AS of P. floridanus displayed potent scavenging activities toward DPPH and ABTS radicals in a concentration dependent manner. Both DPPH and ABTS assays showed that smaller particle size has higher scavenging activity compared to larger particle sizes. For FRAP assay, although there were fluctuations in the result but all the particle size of AW and AS of P. floridanus extract possess the ability to reduce Fe3+ to Fe2+. Four samples (AW2, AW3, AS1 and AS2) with the highest antioxidant activity were selected for anti-inflammatory assay. The ability of AW2, AW3, AS1 and AS2 to inhibit NO production, NO radical scavenging activity, TNF-α and IL-10 production in LPS-stimulated RAW264.7 cells was evaluated. All four samples reduced NO and TNF-α but did not enhance IL-10 expression in LPS-stimulated RAW264.7 cells. It was also observed that the particle size <75-300 μm lacked anti-inflammatory activity. Therefore, it is suggested that the particle size <300 μm of P. floridanus hot water extract could be a good source of antioxidant and anti-inflammatory compounds to counteract the free radicals. These results demonstrate how the sieving process can boost the bioactive compounds found in P. floridanus powder. This understanding holds significance for the food and pharmaceutical sectors, as it enables the creation of products with specific particle size fractions, maximizing both functional and nutritional benefits
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