Yunsong Zhu

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In this work, we study the problem of the safe transportation of hazardous materials, which is an important operational problem and has been studied extensively in the literature. We outline previous work and propose a new model that is a variant of the vehicle routing problem with time windows (VRPTW). The objective is to find a schedule to guarantee the(More)
Energy-dependent patterns in the arrival directions of cosmic rays are searched for using data of the Pierre Auger Observatory. We investigate local regions around the highest-energy cosmic rays with E ≥ 6×10 19 eV by analyzing cosmic rays with energies above E ≥ 5×10 18 eV arriving within an angular separation of approximately 15 •. We characterize the(More)
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