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In this paper we study how the legal subject "homeless" (habitante de la calle) was created in Colombia, and how it allowed certain ways of governance in contemporary cities. Focusing on the Colombian case, we argue that contemporary forms of control were only possible when the subject 'homeless' was distanced from other concepts such as lazy, indigent or mad. Furthermore, we make an analysis of the legal frame and academic discourses that developed the new subject of government, and studied how they legitimized new forms of crime control and new ways of organizing urban spaces. In order to do so, a case study of Bogota has been conducted focusing on national and local regulations on the matter, as well as on the discourses on security, crime control and government of problematic populations in both scales of the state administration. [ABSTRACT FROM AUTHOR]

The following paper shows the result of a new tool assisted by computer developed for cell coverage prediction in the VHF and UHF bands for urban environments. The application is based on the two ray electromagnetic model in combination with Vogler model, which takes into account themodiffraction effects. There were taken several power measurements in Bogota (Colombia), using an automatic monitoring system, in order to validate the implemented model. Based on the power measurement data a new simplified empirical model was proposed which lets predict the coverage in urban scenarios with buildings where the height is comparable with that of the transmitter's. [ABSTRACT FROM AUTHOR]