Reginald E. Bryant

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According to the UN-HABITAT, the city of Nairobi loses half a million USD daily due to congestion on roads designed for a city 10 times smaller. Therefore, there is a great need for traffic management and awareness solutions. Many existing solutions are unsuitable for cities like Nairobi due to economic constraints, dynamic events, uncertainty, and poor(More)
In this poster, we present a mobile crowdsourcing application, called Afya Ya Barabara (AYB) (which means road health in Kiswahili). The application serves 2 major roles: First is to collect and visualize data on road surface conditions in Nairobi. Second role is as a citizen engagement platform to raise awareness on the state of road conditions in Nairobi(More)
Rapid urbanization of developing cities creates challenges for governments to update and maintain the city infrastructure. One particular challenge is to plan for road capacities that will sustain the growing demand for surface transportation on the road network. For these cities, a sophisticated road infrastructure that includes sensors (e.g., loop(More)
—A design is presented for a nanoelectromechanical optical switch based on the horizontal deflection of an input wave-guide to align with one of two output waveguides. The use of high-index (GaAs) strip waveguides surrounded by air, designed to be single-mode at 1.55 m, significantly decreases device dimensions as compared to previous designs. Design(More)
Introduction The emphasis of the research program is the design, epitaxial growth, device fabrication and characterization of a number of photonic and opto-electronic structures. The epitaxial growth of the heterostructures is performed in the laboratory consisting of two gaseous source epitaxy reactors interconnected to several smaller chambers, which are(More)
Nairobi is one of the fastest growing metropolitan cities and a major business and technology powerhouse in Africa. However, Nairobi currently lacks monitoring technologies to obtain reliable data on traffic and road infrastructure conditions. In this paper, we investigate the use of mobile crowdsourcing as means to gather and document Nairobi's road(More)
Waveguide bends, in the (In,Ga)(As,P) material system, have been simulated, fabricated and tested. A process is developed for waveguides of 1p m through 7pm widths. Waveguides containing S-bends of varying bending radii as well as resonator bends were examined. Inconsistent measurement results were obtained. Improved measurement methods have been suggested.
Driving in developing cities presents numerous challenges. Traffic congestion and traffic accidents are the most visible challenges which are caused by different underlying factors. Two chief factors are poorly planned and maintained roadway infrastructure and the decisions made by the drivers. Drivers are constantly forced to negotiate road hazards, like(More)