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We use a front tracking algorithm to explicitly construct entropy solutions for the Lighthill-Whitham-Richards traffic flow model with a flow-density relationship that is piecewise quadratic, continuous, non-smooth, and non-concave. The solution is exact if the initial condition is piecewise linear and the boundary conditions are piecewise constant. The(More)
Multi-object multimedia multicast services consist of users that subscribe to different secure levels or different sets of data streams. These services need a security mechanism to ensure hierarchical access control. Existing methods based on traditional schemes are not efficient for multi-object multicasts. In this paper, we present a multi-dimensional(More)
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