972 resultados para Chicago Transit Authority


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An investigation into support for restrictions on people testing seropositive for HIV is reported on. Data were collected during telephone interviews with two-hundred adults aged eighteen to sixty-five in the Chicago metropolitan area. Using the analytic technique of LISREL, six models which attempt to explain support for restrictions were tested. It was found that the model best supported by the data indicates that two groups contribute to support for restrictions on HIV carriers - one due to intolerance of homosexuality and one to mistrust of public health officials regarding their control and management of the AIDS epidemic. The relevance of these findings for public health policy makers is discussed.

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Instituto Politécnico do Porto. Instituto Superior de Contabilidade e Administração do Porto

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La Escuela de Chicago de pensamiento social, desde sus fundadores de finales del siglo XIX a las grandes figuras de las primeras décadas del siglo XX, es un referente imprescindible por sus estudios, considerados actualmente parte del canon sociológico, sobre la ecología humana, la ciudad, la inmigración, las relaciones étnicas, la delincuencia, el control social y el self humano. Este ensayo sostine que en esta escuela se encuentra una reflexión pioneira y una invetigación de gran relevancia sobre los temas de la comunicación y los medios de comunicación en la sociedad, habiendo contribuído a convertirlos en un centro de atención para la teoría social y la sociología.

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Dissertation submitted in partial fulfilment of the requirements for the Degree of Master of Science in Geospatial Technologies

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A Work Project, presented as part of the requirements for the Award of a Masters Degree in Management from the NOVA – School of Business and Economics

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A Work Project, presented as part of the requirements for the Award of a Masters Degree in Economics from the NOVA – School of Business and Economics

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Delay Tolerant Network (DTN) is a communication architecture enabling connectivity in a topology with unregular end-to-end network connection. DTN enables communication in environments with cross-connectivity, large delays and delivery time variations, and a high error rate. DTN can be used in vehicular networks where public transport get involved. This research aims to analyze the role of public transit as a DTN routing infrastructure. The impact of using public transit as a relay router is investigated by referencing the network performance, defined by its delivery ratio, average delay and overhead. The results show that public transit can be used as a backbone for DTN in an urban scenario using existing protocols. This opens insights for future researches on routing algorithm and protocol design.