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This paper proposes an analytical model to evaluate the performance of the listen before talk (LBT) based coexistence scheme in the scenario with multiple LTE small bases (SBSs) over the unlicensed spectrum. Based on the proposed model, we further derive the expressions of the occupancy time of the LTE/Wi-Fi/access overhead and the collision probability. It is shown from numerical results that the...
This paper discusses the concepts and methods of six sigma and the main quality improvement models at home and abroad, combines the demand for aerospace quality improvement with existing effective methods and experience with aerospace quality improvement, proposes the connotation and general idea of aerospace six sigma improvement, forms a systematic and structured improvement model of discernment,...
This article proposes a new design of a 3D unfolded/tightened mechanism based on the spine structure of golden tree snake, which can realize torsion and bending. Inspired by golden tree snake vertebrae space deformation characteristics, analyzing the anatomy characteristics of the golden tree snake spine bone and muscle distribution characteristics, The bionic mechanism and drive unit can drive the...
In order to accomplish the product special requirements of customers and establish the product developing platform for non-professional effectively, the requirement feature and requirement agile expression model of individualized product were put forward. The logical meta model and physical structure model of individualized product requirement information were built, the basic management and operating...
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