Real-time locating systems (RTLS, also known as real-time location systems) have become an important component of many existing ubiquitous location aware systems. While GPS (global positioning system) has been quite successful as an outdoor real-time locating solution, it fails to repeat this success indoors. A number of RTLS technologies have been used to solve indoor tracking problems. The ability to accurately track the location of assets and individuals indoors has many applications in healthcare. This paper provides a condensed primer of RTLS in healthcare, briefly covering the many options and technologies that are involved, as well as the various possible applications of RTLS in healthcare facilities and their potential benefits, including capital expenditure reduction and workflow and patient throughput improvements. The key to a successful RTLS deployment lies in picking the right RTLS option(s) and solution(s) for the application(s) or problem(s) at hand. Where this application-technology match has not been carefully thought of, any technology will be doomed to failure or to achieving less than optimal results.

The symbol of light has commonly represented human desires for goodness, order, truth, perpetual abundance, and the transcendence of earthly limits. Modern practices of artificial light cultivation remain associated with a symbolic promise to banish darkness and its corollaries-lack, death, ignorance, disease, and chaos. In today's global and increasingly urbanized world this association is most notably emblematized in the modem city, which is lit up at night in a technologically brilliant display that ironically also conveys the deepening ecological disaster of anthropogenic climate change. Responding to German philosopher Hans Blumenberg's essay 'Light as a Metaphor for Truth', this article seeks to uncover the ways that technological figurations of light transform an ancient association with freedom into dangerous practices of fuel fetish and over-consumption. Increased awareness of such habits of overconsumption could help to decrease urban light pollution and the ecological danger that it signifies.

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