RBIR Based on Signature Graph

This paper approaches the image retrieval system on the base of visual features local region RBIR (region-based image retrieval). First of all, the paper presents a method for extracting the interest points based on Harris-Laplace to create the feature region of the image. Next, in order to reduce the storage space and speed up query image, the paper builds the binary signature structure to describe the visual content of image. Based on the image's binary signature, the paper builds the SG (signature graph) to classify and store image's binary signatures. Since then, the paper builds the image retrieval algorithm on SG through the similar measure EMD (earth mover's distance) between the image's binary signatures. Last but not least, the paper gives an image retrieval model RBIR, experiments and assesses the image retrieval method on Corel image database over 10,000 images.Comment: 4 pages, 4 figure

On the Brunk-Chung type strong law of large numbers for sequences of blockwise mm-dependent random variables

For a sequence of blockwise m-dependent random variables {Xn, n ≥ 1}, conditions are provided under which limn→∞( ∑n i=1Xi)/bn = 0 almost surely where {bn, n ≥ 1} is a sequence of positive constants. The results are new even when bn ≡ nr, r> 0. As special case, the Brunk-Chung strong law of large numbers is obtained for sequences of independent random variables. The current work also extends results of Móricz [Proc. Amer. Math. Soc. 101 (1987) 709–715], an

Trade Liberalisation and Optimal R&D Policies in a Model of Exporting Firms Conducting Process Innovation

URL des Documents de travail : http://ces.univ-paris1.fr/cesdp/cesdp2016.htmlDocuments de travail du Centre d'Economie de la Sorbonne 2016.28 - ISSN 1955-611XThis paper discusses the impact of trade liberalisation and R&D policies on exporting firms' incentive to innovate and social welfare. Key factors determining the government's optimal policy are the strength of R&D spillover effect and the toughness of firm competition. When firms only compete in an overseas market, the optimal policy is to tax R&D. Trade liberalisation in the overseas market induces a higher R&D tax rate to be imposed on firms. When firms also conduct business in the home market, the government should financially support firms' R&D. Trade liberalisation always increases firms' output sales, R&D investments, and social welfare