Representation and reasoning about dynamic spatial phenomena requires at its foundation a formalism of spatial change. This paper extends our understanding of topological change, by providing a classification and analysis of events associated with changes in topological structures of spatial areal objects as they evolve through time. Tree structures are employed to represent topological relatio...

The study had the objective of assessing the seasonality of Aedes albopictus and the impact of environmental factors on breeding sites in a protected urban area. Immature individuals were collected through fluid aspiration from nine tree holes, in the Ecological Park of Tietê in the city of São Paulo, Southern Brazil, from 2001 to 2002. The index of positivity and number of individuals results ...

The problem considered below is that of determining information about the topology of a subset X ⊂ R given only a finite point approximation to X . The basic approach is to compute topological properties – such as the number of components and number of holes – at a sequence of resolutions, and then to extrapolate. Theoretical foundations for taking this limit come from the inverse limit systems...

Extremal black holes in M-theory compactification on M × S 1 are microscopically represented by fivebranes wrapping P × S 1 , where M is a Calabi-Yau threefold and P is a four-cycle in M. Additional spacetime charges arise from momentum around the S 1 and expectation values for the self-dual three-form field strength in the fivebrane. The microscopic entropy of the fivebrane as a function of al...

VLSI layout applications yield instances of the Steiner tree problem over grid graphs with holes, which are considered hard to be solved by current methods. In particular, preprocessing techniques developed for Steiner problems over general graphs are not likely to reduce signiicantly such VLSI instances. We propose a new preprocessing procedure, combining earlier ideas from the literature to m...

Goat warble-fly infestation is caused by przhevalskiana silenus (Diptra Oestridae) larvae and it is characterized by the presence of warble under the hide of the back and flanks of the animal. This study was carried out from March 2009 to March 2010 on the hides sent to the khorasn leather industries for grading, processing and tanning. This study demonstrated from 340,797 goat hides e...

AIMS To examine the effect of a unilateral full thickness macular hole on sensory and motor binocular function and to study recovery after successful surgical closure. METHODS Twenty eight consecutive patients undergoing surgery for a unilateral macular hole underwent orthoptic examination, including measurements of Titmus and TNO stereoacuity and motor fusion range before surgery. Twenty thr...

By studying the changes in employees’ networks and performance before and after the introduction of a social networking tool, I find that a structurally diverse network (low in cohesion and rich in structural holes) has a positive effect on work performance. The size of the effect is smaller than traditional estimates, suggesting that omitted individual characteristics may bias the estimated ne...

In-network data aggregation algorithms are based on the premise that the energy requirements for data collection in sensor networks (SNs) can be significantly reduced by aggregating and collecting individual sensor readings over an efficient data collection path. In this work, we focus on selective aggregate queries, i.e., queries that aggregate data only from a subset of all network nodes. The...