4 resultados para Isotropic convex regions

em WestminsterResearch - UK


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This study reports results from the first International Body Project (IBP-I), which surveyed 7,434 individuals in 10 major world regions about body weight ideals and body dissatisfaction. Participants completed the female Contour Drawing Figure Rating Scale (CDFRS) and self-reported their exposure to Western and local media. Results indicated there were significant cross-regional differences in the ideal female figure and body dissatisfaction, but effect sizes were small across high-socioeconomic-status (SES) sites. Within cultures, heavier bodies were preferred in low-SES sites compared to high-SES sites in Malaysia and South Africa (ds = 1.94-2.49) but not in Austria. Participant age, body mass index (BMI), and Western media exposure predicted body weight ideals. BMI and Western media exposure predicted body dissatisfaction among women. Our results show that body dissatisfaction and desire for thinness is commonplace in high-SES settings across world regions, highlighting the need for international attention to this problem.

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There are no exact boundaries of what constitutes Central Europe, but it is nevertheless very evident as a zone of interloping forces stretching across Europe. The result has been negotiated, conflictual and contested processes defining an essentially virtual, discursive, yet also actually existing, space of ‘Central Europe’. Yet, and this is the particular message of this collection of essays, ‘transition’ has not merely been a process ‘on the ground’ as object of investigation and discussion, but has also affected the observers, especially academic commentators and analysts – both within Central Europe, but also outside. This includes a growing interaction between discussions and analyses ‘inside’ and ‘outside’ Central Europe on the phenomenon of ‘transition’. The result has been mutual learning processes and changes of ways of looking at things and interpreting them. The book is divided into two parts, roughly reflecting the two key research questions.The first part (A) is devoted to transitions in regional science. Part B focuses on changes in variety of territorial structures and developmentissues caused by Central-European transitions and which are resulting in differential pathways of regional development in the region.

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In order to accelerate computing the convex hull on a set of n points, a heuristic procedure is often applied to reduce the number of points to a set of s points, s ≤ n, which also contains the same hull. We present an algorithm to precondition 2D data with integer coordinates bounded by a box of size p × q before building a 2D convex hull, with three distinct advantages. First, we prove that under the condition min(p, q) ≤ n the algorithm executes in time within O(n); second, no explicit sorting of data is required; and third, the reduced set of s points forms a simple polygonal chain and thus can be directly pipelined into an O(n) time convex hull algorithm. This paper empirically evaluates and quantifies the speed up gained by preconditioning a set of points by a method based on the proposed algorithm before using common convex hull algorithms to build the final hull. A speedup factor of at least four is consistently found from experiments on various datasets when the condition min(p, q) ≤ n holds; the smaller the ratio min(p, q)/n is in the dataset, the greater the speedup factor achieved.