Download PDF by David K. Randall: Dreamland: Adventures in the Strange Science of Sleep

By David K. Randall

An engrossing exam of the technological know-how at the back of the little-known global of sleep.

Like many people, journalist David ok. Randall by no means gave sleep a lot concept. that's, till he started sleepwalking. One nighttime crash right into a hallway wall despatched him on an research into the unusual technology of sleep.

In Dreamland, Randall explores the study that's investigating these darkish hours that make up approximately a 3rd of our lives. Taking readers from army battlefields to children’s bedrooms, Dreamland exhibits that sleep isn't so simple as it sort of feels. Why did the result of one sleep learn swap the bookmakers’ odds for convinced Monday evening soccer video games? Do ladies sleep otherwise than males? And in the event you kill a person if you are sleepwalking, does that count number as murder?

This ebook is a journey of the customarily peculiar, occasionally traumatic, and continually interesting issues that move on within the unusual global of sleep. You’ll by no means examine your pillow a similar approach again.
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2 Features with at least 6 versions highlighted • Versions. As pointed out above, more versions essentially mean more provenance information to analyze. At the same time, they indicate that the feature has undergone a certain number of iterations with the goal to improve the feature’s quality. We therefore assume that a higher version number adds to the feature’s trustworthiness. • Users. A higher number of users involved in creating a feature increases the trust measure, following the many eyes principle.

28 C. Keßler and R. T. A. de Groot Fig. 1 Thematic Accuracy and Topological Consistency During the field survey, all selected features have been inspected on site, pictures were taken, and, if possible, people were asked to confirm the feature type in consideration to minimize bias. The following components were examined during this survey and are listed here in the order of higher to lesser importance regarding its influence on the quality of the thematic accuracy: 1. g. is this place a restaurant or a café?

However, due to the large number of potential feature types, the wiki does not provide lists of tags that should be provided for a certain type in order to provide complete information. We therefore had to come up with a method that determines importance of a specific tag for a given feature type. Based on the term frequency—inverse distance frequency measure (tf-idf) (Salton et al. 1975) that measures how characteristic a specific term is for a given document, we have defined an inverse feature type frequency (iff).

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Dreamland: Adventures in the Strange Science of Sleep by David K. Randall

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