This paper discusses the problem of covering and hitting a set of line segments L in R by a pair of axis-parallel squares such that the side length of the larger of the two squares is minimized. We also discuss the restricted version of covering, where each line segment in L is to be covered completely by at least one square. The proposed algorithm for the covering problem reports the optimum r...

Modern psychological theories of spatial cognition postulate the existence of a ‘geometric module’ for reorientation. This concept is derived from experimental data showing that in rectangular arenas with distinct landmarks in the corners, disoriented rats often make diagonal errors, suggesting their preference for the geometric (arena shape) over the non-geometric (landmarks) cues. Moreover, e...

When rats trained to forage in one environment are exposed to a second, highly similar environment, their hippocampal place code exhibits a partial remapping in the new environment that becomes more complete with repeated exposures (Tanila, Shapiro, and Eichenbaum, 1997; Bostock, Muller, and Kubie, 1991). If the perforant path projection to CA3 functions as a pattern completion mechanism, and t...

Data dominated signal processing applications are typically described using large and multi-dimensional arrays and loop nests. The order of production and consumption of array elements in these loop nests has huge impact on the amount of memory required during execution. This is essential since the size and complexity of the memory hierarchy is the dominating factor for power, performance and c...

restriction of option of meeting place to the sale contract is treated as incontrovertible in both shiite jurisprudence and iranian civil code in such a way that it is considered among necessities of shiite jurisprudence by some and a matter of consensus by others. however, malik and abu hanifa radically denied the prevailing opinion and shafi‘i had his own idea in this connection. since transa...

During pauses in exploration, ensembles of place cells in the rat hippocampus re-express firing sequences corresponding to recent spatial experience. Such "replay" co-occurs with ripple events: short-lasting (approximately 50-120 ms), high-frequency (approximately 200 Hz) oscillations that are associated with increased hippocampal-cortical communication. In previous studies, rats exploring smal...

Central Place and Central Flow Theory are geographic principles explaining why and how cities develop across large regional spaces. Central Place Theory postulates that cities self-organize into a spatial hierarchy were small numbers of very large ‘Central Places’ support numerous surrounding and less developed ‘Low Places’, while ‘Middle Places’ develop at the periphery of where Central Places...