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- Wanlin Zhu, Wei Wen, Yong He, Aihua Xia, Kaarin J Anstey, Perminder Sachdev
- Neurobiology of aging
- 2012

We examine normal aging from the perspective of topological patterns of structural brain networks constructed from two healthy age cohorts 20 years apart. Based on graph theory, we constructed structural brain networks using 90 cortical and subcortical regions as a set of nodes and the interregional correlations of grey matter volumes across individual… (More)

- Wei Wen, Wanlin Zhu, Yong He, Nicole A Kochan, Simone Reppermund, Melissa J Slavin +4 others
- The Journal of neuroscience : the official…
- 2011

There have been many attempts at explaining age-related cognitive decline on the basis of regional brain changes, with the usual but inconsistent findings being that smaller gray matter volumes in certain brain regions predict worse cognitive performance in specific domains. Additionally, compromised white matter integrity, as suggested by white matter… (More)

Palindromes are symmetrical words of DNA in the sense that they read exactly the same as their reverse complementary sequences. Representing the occurrences of palindromes in a DNA molecule as points on the unit interval, the scan statistics can be used to identify regions of unusually high concentration of palindromes. These regions have been associated… (More)

We consider the point process of signal strengths from transmitters in a wireless network observed from a fixed position under models with general signal path loss and random propagation effects. We show via coupling arguments that under general conditions this point process of signal strengths can be well-approximated by an inho-mogeneous Poisson or a Cox… (More)

Keeler, Ross and Xia [1] recently derived approximation and convergence results, which imply that the point process formed from the signal strengths received by an observer in a wireless network under a general statistical propagation model can be modelled by an inhomogeneous Poisson point process on the positive real line. The basic requirement for the… (More)

- Aihua Xia, Richard M Huggins, Martine J Barons, Louis Guillot
- 2016

Many areas of agriculture rely on honey bees to provide pollination services and any decline in honey bee numbers can impact on global food security. In order to understand the dynamics of honey bee colonies we present a discrete time marked renewal process model for the size of a colony. We demonstrate that under mild conditions this attains a stationary… (More)

- Larry Goldstein, Aihua Xia
- 2006

We introduce a new family of distributions to approximate P(W ∈ A) for A ⊂ {. with finite second moments, where, with large probability, W is not concentrated on a lattice of span greater than 1. The well-known Berry–Esseen theorem states that, for Z a normal random variable with mean E(W) and variance Var(W), P(Z ∈ A) provides a good approximation to P(W ∈… (More)

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