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Delaunay triangulation (DT) is a useful geometric structure for net-working applications. We define a distributed DT and present a necessary and sufficient condition for a distributed DT to be correct. This condition is used as a guide for protocol design. We investigate the design of join, leave, failure, and maintenance protocols for a set of nodes in d-dimension (d > 1) to construct and maintain a distributed DT in a dynamic environment. The join, leave, and failure protocols in the suite are proved to be correct for a single join, leave, and failure, respectively. For a system under churn, it is impossible to maintain a correct distributed DT continually. We define an accuracy metric such that accuracy is 100% if and only if the distributed DT is correct. The suite also includes a maintenance protocol designed to recover from incor...
Large-scale layer-2 Ethernet networks are needed for important future and current applications and services including: metro Ethernet, wide area Ethernet, data center networks, cyber-physical systems, and large data processing. However Ethernet bridging was designed for small local area networks and suffers scalability and resiliency problems for large networks. I will present the architecture and protocols of ROME, a layer-2 network designed to be backwards compatible with Ethernet and scalable to tens of thousands of switches and millions of end hosts. We first design a scalable greedy routing protocol, Multi-hop Delaunay Triangulation (MDT) routing, for delivery guarantee on any connectivity graph with arbitrary node coordinates. To achieve near-optimal routing path for greedy routing, we then present the first layer-2 virtual posit...
Continuous curved box girder bridges are increasingly being used in metropolitan large cities particularly as flyovers and as entrance and exit ramps for highspeed freeways. The purpose of this investigation is to examine the static response of continuous curved box girder bridges subjected to various specified OHBD loadings. The prototype structure that was selected for this model study is the Cyrville road Queensway overpass located in the east end of Ottawa. The structure was built in 1973 and designed according to ASHTO design truck load HS20-44 by the Ministry of Transportation and Communication. The bridge is 102.4 meters long, 12.8 meters wide, and consists of two spans with 16.8$\sp\circ$ horizontal angle of curvature between the end supports. Its cross section consists of four contiguous cells with a depth of 1.83 meters. As f...
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