1 A Hierarchical Compositional System for Rapid Object Detection

We describe a hierarchical compositional system for detecting deformable objects in images. Objects are represented by graphical models. The algorithm uses a hierarchical tree where the root of the tree corresponds to the full object and lower-level elements of the tree correspond to simpler features. The algorithm proceeds by passing simple messages up and down the tree. The method works rapidly, in under a second, on 320 × 240 images. We demonstrate the approach on detecting cats, horses, and hands. The method works in the presence of background clutter and occlusions. Our approach is contrasted with more traditional methods such as dynamic programming and belief propagation.

The Bianchi groups are subgroup separable on geometrically finite subgroups

We show that for certain arithmetic groups, geometrically finite subgroups are the intersection of finite index subgroups containing them. Examples are the Bianchi groups and the Seifert-Weber dodecahedral space. In particular, for manifolds commensurable with these groups, immersed incompressible surfaces lift to embeddings in a finite sheeted covering.Comment: 19 page

Mathematical Model and Performance Analysis of a Liquid Desiccant Dehumidification Tower

A finite difference model simulating a liquid desiccant dehumidification tower with lithium chloride as the desiccant solution has been developed. The model determines the packing height needed for a condensation rate. Comparisons with experimental data illustrates that the model produces valid results. Air and desiccant solution temperatures within the dehumidification tower show that a temperature increase is experienced for both the air and desiccant solution from their respective entrances and exits from the tower. Increasing the air mass velocity or the amount of moisture removed from the air supply causes an increase in packing height. Increasing the desiccant mass velocity decreases the packing height

George Mann was not a cowboy : rationalizing western versus Aboriginal perspectives of life and death 'dramatic' history

The dramatic history of the 1885 Riel Rebellion has been revisited and reinterpreted countless times by hundreds of amateur and professional historians from all cultural backgrounds. From 1885 to the mid-twentieth century and beyond the tendency of many historians was to create melodramatic narratives, a writing style that began in various English theatrical traditions, dating back to the Middle Ages. Of particular interest to this study were the eyewitness narratives whose melodramatic style included a desire to codify and define the roles of Aboriginal people, another British tradition of defining the dark skinned ‘other’ that was debated in London theatres from the seventeenth to the nineteenth centuries. The Canadian historical myth was created by gifted writers who captured the broader public’s imagination with their dramatic style, a hegemonic force which eclipsed many Aboriginal versions of similar historical events. One such event was the George Mann family’s dramatic “escape to Fort Pitt,” as remembered by descendants of Mann and those of Nehithawe (Wood Cree) treaty Chief Seekascootch, whose family aided the Mann family in their escape. Through a variety of methods that have included historiographical analysis, literary analysis, playwriting, microhistory, and interviews with members of both families, this paper engages an interdisciplinary approach to the academic areas of drama, history and anthropology as a means of creating a broader picture of history that is hopefully interesting and accessible to people from multiple cultural backgrounds. This project concludes that single discipline western academic narratives do not sufficiently problematize their archival sources, and often underestimate the complexity of Aboriginal epistemologies

(1RS,2SR,7RS,8RS)-N-Benzoyltricyclo[6.2.2.0²,⁷]dodeca-9,11-diene-1,10-dicarboximide

The title 1,4-photoadduct, C₂₁H₁₉NO₃, was formed on irradiation of N-benzoylphthalimide in dichloromethane containing cyclohexene. The bond lengths and angles are generally within the normal ranges. A notable feature of the molecule is the presence within it of four contiguous chiral centres