The objective of this study was to investigate depth perception in astronauts during and after spaceflight by studying their sensitivity to reversible perspective figures in which two-dimensional images could elicit two possible depth representations. Other ambiguous figures that did not give rise to a perception of illusory depth were used as controls. Six astronauts and 14 subjects were teste...

The name of Burdach is associated usually with Naturphilosophie which, during the closing decades of the 18th and in the early 19th century, flourished in Germany. It was inspired by the speculative philosophies of Immanuel Kant's successors, and especially by Schelling, who regarded nature and mind as identical: to him nature was a preparatory stage (Vorstufe), in which mind could develop and ...

The first paper for this lecture [1] categorizes various options for supporting speculative multithreading in hardware, while the second [2] describes a way to implement it in software without specific architectural support. The class discussion covered the requirements and tradeoffs of software, hardware, and hybrid support for speculative multithreading. Thread-level speculation (TLS) is a wa...

A compile-time analysis technique is developed to derive the probability with which a user-defined function or a supercombinator requires each one of its arguments. This provides a basis for identifying useful speculative parallelism in a program. The performance of speculative evaluation is compared with that of lazy evaluation, and the necessary conditions under which speculative evaluation p...

In this paper, I present additional information for policy-makers and researchers to consider in response to the view proposed by Potts et al that "the pill is mightier than the sword." I identify states with both high rates of terrorism and a youth bulge and discuss correlates of both these societal characteristics. The research examined supports the view that factors other than access to fami...