The remarkable advances in telecommunications and information technology have enabled companies to focus on velocity and timeliness throughout the supply chain. To achieve these competitive advantages, they must be able to make effective use of the vast amount of real-time information now available to them. The Dynamic Vehicle Routing Problem (DVRP) is a prime example of a distribution context ...

In this paper we revisit the existence of traveling waves for delayed reaction diffusion equations by the monotone iteration method. We show that Perron Theorem on existence of bounded solution provides a rigorous and constructive framework to find traveling wave solutions of reaction diffusion systems with time delay. The method is tried out on two classical examples with delay: the predator-p...

An instance of the curve reconstruction problem is a finite sample set V of an unknown collection of curves γ. The task is to connect the points in V in the order in which they lie on γ. Giesen [Proceedings of the 15th Annual ACM Symposium on Computational Geometry (SCG ’99), 1999, pp. 207–216] showed recently that the traveling salesman tour of V solves the reconstruction problem for single cl...

We consider computation in the presence of closed timelike curves (CTCs), as proposed by Deutsch. We focus on the case in which the CTCs carry classical bits (as opposed to qubits). Previously, Aaronson and Watrous showed that computation with polynomially many CTC bits is equivalent in power to PSPACE. On the other hand, Say and Yakaryılmaz showed that computation with just 1 classical CTC bit...

Traditional debugging visualizes the execution state at a certain point in time. With omniscient debugging, it is possible to navigate and inspect the execution at different points in time. This demo present a prototype of a live coding environment that makes it easy to navigate the execution and extends omniscient debugging with an additional dimension in order to navigate to different version...

The extended homogeneous balance method is used to construct exact traveling wave solutions of the Maccari system, in which the homogeneous balance method is applied to solve the Riccati equation and the reduced nonlinear ordinary differential equation. Many exact traveling wave solutions of the Maccari system equation are successfully obtained.

We use an interactive genetic algorithm to divide and conquer large traveling salesper-son problems. Current genetic algorithm approaches are computationally intensive and may not produce acceptable tours within the time available. Instead of applying a genetic algorithm to the entire problem, we let the user interactively decompose a problem into subproblems, let the genetic algorithm separate...

We propose a 4 3 -approximation in linear time for the metric traveling salesman reoptimization problem under vertex insertion. This constitutes an improvement of the time complexity of the best known existing bound since in (G. Ausiello, B. Escoffier, J. Monnot and V. Th. Paschos: Reoptimization of minimum and maximum traveling salesman’s tours. J. Discrete Algorithms 7(4): 453-463, 2009) a 4/...

the writers of this article have compared the satisfaction level of international tourists who traveled to isfahan for the first time and those who have repeatedly traveled to this city. one hundred and sixty tourists were selected randomly in 2002 and the data gathered through filling questionnaires. the result is surprising and indicates that the satisfaction level for those who have repeated...

A survey of adolescents (N = 1,488) documented third-person perception (TPP) regarding Facebook use and cyber bullying. As Facebook establishes itself as the dominant social network, users expose themselves to a level of bullying not possible in the analog world. The study found that 84% of adolescents (middle school through college undergraduates) use Facebook, and that most users log on daily...