In recent years, the integrated space-ground network communication system plays an increasingly important role in earth observation and space information confrontation for the civilian and military service. Their characteristic on wide coverage, which may be the only way to provide Internet access and communication services in many areas, has extensively promoted its significance. This paper discusses the architecture of integrated space-ground communication networks, and introduces a novel routing algorithm named Improved Store-and-forward Routing Mechanism (ISRM) to shorten the transmission delay in such a network. The proposed ISRM algorithm is based on store and forward mechanism, while it trying to find several alternative delay-constraint paths by building the route-related nodes encounter-probability information table and communication timing diagram. Simulation is conducted at the end, and comparisons between ISRM and baseline algorithm are given. The results show that ISRM can achieve relatively good performance in terms of transmission latency in integrated space-ground networks.
In this paper, analytical method is employed to analyze the system strain energy and critical diameter of one kind of
longitudinally heterostructure nanowire which contains component gradient buffer sections. Based on the critical
diameter model of F. Glas in heterostructure nonawires, calculation has been made to research on how does single-layer
thickness and total thickness of gradient buffer effect the critical radius of the system. The results illustrate that
component gradient buffer layer can effectively reduce the system strain energy, and the thinner the single-layer buffer
section thickness , the more obvious the improvement of its critical radius; if the lattice mismatch of the heterostructure
nonawires is smaller, the strain energy can be reduced more significantly, also the greater rate of increase of its critical
radius. The freedom cut of the nonawires diameter can be realized by controlling the component and thickness of
buffer sections. Using Au assistant MOVCD method, we can get high-quality nonawires with component gradient buffer
sections, in contrast to the bad quality SEM image of the nonawires without buffer layers, which effectively prove the
above conclusions.
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