Moving out of Their Places: Migration into Australia

Out of Africa, into Australia

Moving Up or Moving Out :

This research note presents a theory of congressional retirement and tests it with data from the 102d Congress. The results bridge the gap between the 1970s macro retirement studies and the more recent micro-centered approaches by highlighting the importance of career ceilings. Defined as the interaction between formal position and years of service, the career ceilings variable can be interpret...

Tuning into Places

In the human brain, the inferior temporal cortex contains areas that seem to respond selectively to particular types of visual stimuli, such as faces or animals. One such region—the parahippocampal place area, or PPA—responds most strongly to images of places instead of faces, but how this higher-order selectivity is achieved remains unclear. In a new study in PLoS Biology, Rajimehr et al. iden...

Moving Faces to Other Places: Facet Derangements

Derangements are a popular topic in combinatorics classes. We study a generalization to face derangements of the n-dimensional hypercube. These derangements can be classified as odd or even, depending on whether the underlying isometry is direct or indirect, providing a link to abstract algebra. We emphasize the interplay between the geometry, algebra and combinatorics of these sequences, with ...

Aggregation Languages for Moving Object and Places of Interest Data

We address aggregate queries over GIS data and moving object data, where non-spatial data are stored in a data warehouse. We propose a formal data model and query language to express complex aggregate queries. Next, we study the compression of trajectory data, produced by moving objects, using the notions of stops and moves. We show that stops and moves are expressible in our query language and...