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Rendezvous problem is known as the fundamental issue in MAC design for cognitive radio networks (CRNs). With the concept of blind rendezvous, numerous channel-hopping sequence (CHS) based rendezvous schemes have been proposed to solve this problem. However, little attention is paid to the design of a CSMA/CA MAC based on these rendezvous schemes. In this paper, we propose a cooperative CSMA/CA MAC...
At the stage of oilfield with high water-cut, the yield declines year by year. In order to slow down its declining rate, the annual water injection ought to be increased year after year for the water flooding oilfield. Then it is important to determine the reasonable water injection so as to control the rising rate of water-cut and to extend the lifespan of the oilfield. In this paper, the yield declining...
The southern part of Gurbantunggut Desert is the concentrated distribution area of ephemerals which are important in reducing wind, stabilizing sand and keeping the desert stable. However, little research has been done so far on the community diversity and ecosystem function of ephemerals. This study provides an inspection and analysis of the diversity feature of ephemerals in 35 sites which cover...
In this paper, an novel method for interferometric synthetic aperture radar (InSAR) image registration is proposed. The approach is more accurate than conventional methods since it uses a continuous interpolation technique. The approach gets rid of the limitation of restricted registration accuracy caused by discrete interpolation. The performances of the proposed method are shown by using simulated...
In this paper we construct a new class of nonlinear chaotic maps for secure cryptosystems. These maps can overcome the security holes brought by the ldquopiecewise linearityrdquo of the previous piecewise linear chaotic maps (PWLCM) due to a fact that the chaotic sequences generated by the derived iterative system based on the proposed maps are proved to have perfect dynamic properties, such as uniform...
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