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The applications of dynamic content updates for a group of users, for example weather report and traffic congestion broadcast, have been shown to benefit significantly from Delay Tolerant Networks (DTN) communication mechanisms such as opportunistic contact and user sharing. In this paper, we study the dynamic content updates over energy-constrained DTN, and focus on its asymptotic properties about...
In order to provide communication service in the Intermittently Connected Mobile Networks (ICMN) where there is only intermittent connectivity between mobile nodes, a variety of epidemic-style routing algorithms have been proposed to achieve high message delivery probability. However, current works do not address the realistic environment that a message is split into multi frames to be transmitted...
Recently network virtualization is considered as a powerful way to overcome the current ossification of Internet, and is viewed as the keystone of the next-generation network architecture. In network virtualization, virtual network (VN) embedding problem, which assigns virtual nodes and links to physical network, plays an important role. Due to the scarcity of physical resource, efficient and effective...
Due to the uncertainty of transmission opportunities between mobile nodes, Delay Tolerant Networks (DTN) routing exploits the opportunistic forwarding mechanism. Optimal policies for opportunistic forwarding are crucial to maximizing the message delivery probability while reducing the forwarding cost. In this paper, we investigate the optimal opportunistic forwarding policies for the energy- constrained...
Tracking constitutes a major challenge in Ultra-Wideband (UWB)communications due to dense multipath environment and low power consumption. Most of the existing studies on tracking fall within low rate Impulse Radio UWB (IR-UWB) scope, with the assumption that Inter-Frame Interference (IFI) or Inter-Symbol Interference (ISI) is absent. In this paper, we settle on high rate Direct-Sequence UWB (DS-UWB)...
In order to make the grout spreading in coal and rock fractured network more direct-viewing, the parallel plate model is used to analyze grout flowing in a fracture primarily, then the grouting pressure drawdown formula in a single fracture is established. At the same time, the influence of the fracture aperture and the inlet grouting flow volume rate in unit width of fracture on the width of the...
From the operation mechanism of the ball mill with double inlets and outlets, this paper gives a research work to the simulation of the ball mill with double inlets and outlets, and proposes a corresponding mathematical model of the six controlled with six control variables of the ball mill with double inlets and outlets, and simulates with Matlab using the operation data of a power plant. The result...
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