Extending broadband past the urban fringe with wireless mesh : a strategic analysis with policy implications for Kenya's Universal Service Fund

Thesis (S.M. in Technology and Policy)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2011.Cataloged from PDF version of thesis.Includes bibliographical references (p. 114-119).As the competitive wholesale cost of bandwidth continues to plummet in Kenya, last-mile networks have become a bottleneck in the extension of affordable broadband outside major cities. In this work we explore the business case for small-scale wireless mesh networks as a means to implement demand-driven, bottom-up growth of broadband infrastructure on the outskirts of Nairobi, Kenya. Under the hypothesis that current conditions are not attractive to small scale operators (SSO), we develop a continuous growth model to understand the investment required by a SSO before a small-scale network is able to grow sustainably. The model is then used to test the effects of a variety of policy interventions on the SSO's required investment. Our analysis reveals that the two primary barriers for SSOs are license fees and inability to access market prices for upstream inputs at prices competitive with large commercial operators. Based on these results we propose government support for a SSO cooperative as an efficient method of supporting small-scale wireless networks and their operators.by Keith A. Berkoben.S.M.in Technology and Polic

Central Venous Stenosis Caused by Traction of the Innominate Vein due to a Tuberculosis-Destroyed Lung

We report a case of central venous stenosis due to a structural deformity caused by a tuberculosis-destroyed lung in a 65-year-old woman. The patient presented with left facial edema. She had a history of pulmonary tuberculosis, and the chest X-ray revealed a collapsed left lung. Angiography showed leftward deviation of the innominate vein leading to kinking and stenosis of the internal jugular vein. Stent insertion improved her facial edema