742 research outputs found
Monte Carlo simulations of the classical two-dimensional discrete frustrated model
The classical two-dimensional discrete frustrated model is studied
by Monte Carlo simulations. The correlation function is obtained for two values
of a parameter that determines the frustration in the model. The ground
state is a ferro-phase for and a commensurate phase with period N=6
for . Mean field predicts that at higher temperature the system enters
a para-phase via an incommensurate state, in both cases. Monte Carlo data for
show two phase transitions with a floating-incommensurate phase
between them. The phase transition at higher temperature is of the
Kosterlitz-Thouless type. Analysis of the data for shows only a
single phase transition between the floating-fluid phase and the ferro-phase
within the numerical error.Comment: 5 figures, submitted to the European Physical Journal
Mixed integer nonlinear programming for Joint Coordination of Plug-in Electrical Vehicles Charging and Smart Grid Operations
The problem of joint coordination of plug-in electric vehicles (PEVs)
charging and grid power control is to minimize both PEVs charging cost and
energy generation cost while meeting both residential and PEVs' power demands
and suppressing the potential impact of PEVs integration. A bang-bang PEV
charging strategy is adopted to exploit its simple online implementation, which
requires computation of a mixed integer nonlinear programming problem (MINP) in
binary variables of the PEV charging strategy and continuous variables of the
grid voltages. A new solver for this MINP is proposed. Its efficiency is shown
by numerical simulations.Comment: arXiv admin note: substantial text overlap with arXiv:1802.0445
Navigation of a UAV Network for Optimal Surveillance of a Group of Ground Targets Moving Along a Road
With the rapid increase of vehicles in recent years, traffic surveillance becomes a crucial issue of traffic management. Since the traditional static sensor-based surveillance system can only passively monitor traffic, this paper considers the usage of unmanned aerial vehicles (UAVs), which can proactively conduct traffic surveillance thanks to the excellent mobility of UAVs. Specifically, we consider the navigation problem of a network of UAVs to effectively monitor a group of ground targets which move along a curvy road. A surveillance optimization problem is stated, and a distributed navigation algorithm for the UAV network is developed. It is proved that the proposed algorithm is locally optimal. Simulations confirm the effectiveness of the proposed navigation algorithm
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