Spatial population dynamics can seldom be ignored in management aimed at conserving or controlling plant species in a spatial context. Therefore, spatial population models, that bring together knowledge about a species’ local demography and dispersal behavior, are of growing applied importance. Here, we survey increasingly complex analytical and simulation models that are being developed to des...

BACKGROUND The systemic form of porcine circovirus associated disease (PCVAD), also known as postweaning multisystemic wasting syndrome (PMWS) was initially detected in the early 1990s. Starting in 2004, the Canadian swine industry experienced considerable losses due to PCVAD, concurrent with a shift in genotype of porcine circovirus type 2 (PCV2). Objectives of the current study were to explor...

Spread of populations in space often takes place via formation, interaction and propagation of separated patches of high species density, without formation of continuous fronts. This type of spread is called a ‘patchy spread’. In earlier models, this phenomenon was considered to be a result of a pronounced environmental or/and demographic stochasticity. Recently, it was found that a patchy spre...

-With the increasing influence of digital network and communication, armour from perilous intrusion and corruption of information (e.g. image, video, speech etc) during transmission is a paramount issue. To protect the image and video from the unauthenticated access or tampering, watermarking is adopted as a solution. In this paper we have proposed a spatial domain Spread Spectrum (SS) watermar...

Mathematical modeling of the spread of infectious diseases is a well established field with high practical importance. Underlying most analytical approaches is the assumption of “perfect mixing,” that is the idea that the spatial structure of the population can be neglected. This assumption is crucial to the solvability of the models, but can be dropped when using computational models instead o...

Considerable data demonstrates a role for the hippocampus in spatial navigation. Here we present a detailed model of how the components of hippocampal circuitry might guide movement toward flexible goal locations in a familiar environment. The model contains the following features: (1) Route planning is based on the spread of activation; (2) The spread of activation is gated by environmental co...

With sufficient image encoding, high-resolution fMRI studies are limited by the biological point-spread of the hemodynamic signal. The extent of this spread is determined by the local vascular distribution and by the spatial specificity of blood flow regulation, as well as by measurement parameters that (i) alter the relative sensitivity of the acquisition to activation-induced hemodynamic chan...