Items where author is affiliated with Federal University of Minas Gerais
Number of items: 2.
and Duarte, Diego
and Meira Jr., Wagner
and Almeida, Virgilio
and Góes, Paulo Analyzing Seller Practices in a Brazilian Marketplace.
E-commerce is growing at an exponential rate. In the last decade, there has been an explosion of online commercial activity enabled by World Wide Web (WWW). These days, many consumers are less attracted to online auctions, preferring to buy merchandise quickly using ﬁxed-price negotiations. Sales at Amazon.com, the leader in online sales of ﬁxed-price goods, rose 37% in the ﬁrst quarter of 2008. At eBay, where auctions make up 58% of the site’s sales, revenue rose 14%. In Brazil, probably by cultural inﬂuence, online auctions are not been popular. This work presents a characterization and analysis of ﬁxed-price online negotiations. Using actual data from a Brazilian marketplace, we analyze seller practices, considering seller proﬁles and strategies. We show that different sellers adopt strategies according to their interests, abilities and experience. Moreover, we conﬁrm that choosing a selling strategy is not simple, since it is important to consider the seller’s characteristics to evaluate the applicability of a strategy. The work also provides a comparative analysis of some selling practices in Brazil with popular worldwide marketplaces.
Vale Menezes, Guilherme
and Ziviani, Nivio
and Laender, Alberto H. F.
and Almeida, Virgílio A Geographical Analysis of Knowledge Production in Computer Science.
We analyze knowledge production in Computer Science by means of coauthorship networks. For this, we consider 30 graduate programs of different regions of the world, being 8 programs in Brazil, 16 in North America (3 in Canada and 13 in the United States), and 6 in Europe (2 in France, 1 in Switzerland and 3 in the United Kingdom). We use a dataset that consists of 176,537 authors and 352,766 publication entries distributed among 2,176 publication venues. The results obtained for different metrics of collaboration social networks indicate the process of knowledge production has a ˘changed differently for each region. Research is increasingly done in teams across different ﬁelds of Computer Science. The size of the giant component indicates the existence of isolated collaboration groups in the European network, contrasting to the degree of connectivity found in the Brazilian and North-American counterparts. We also analyzed the temporal evolution of the social networks representing the three regions. The number of authors per paper experienced an increase in a time span of 12 years. We observe that the number of collaborations between authors grows faster than the number of authors, beneﬁting from the existing network structure. The temporal evolution shows differences between well-established ﬁelds, such as Databases and Computer Architecture, and emerging ﬁelds, like Bioinformatics and Geoinformatics. The patterns of collaboration analyzed in this paper contribute to an overall understanding of Computer Science research in different geographical regions that could not be achieved without the use of complex networks and a large publication database.
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