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An analytical model is proposed to describe the priority schemes of the Enhanced Distributed Channel Access (EDCA) mechanism of the IEEE 802.11e standard. EDCA provides class-based differentiated Quality of Service (QoS) to IEEE 802.11 wireless local area networks (WLANs). However, One of the main challenges with 802.11e EDCA is the configuration of the(More)
BACKGROUND The aim of this study was to evaluate the feasibility of treating vertebral compression fractures using an autonomously developed nitinol memory alloy vertebral stent. MATERIAL AND METHODS Thoracolumbar vertebral specimens from adult human cadavers were made into models of compression fractures. The models were divided into group A, which(More)
According to fire statistics in recent years, in terms of both quantity and loss, electrical fire is the first in the reasons of fire. It is found that arc fault is one of the main reasons of electrical fire, which cause electrical fire. It has seriously harmed the safety of public life and property. So the study on arc fault particularly on the detection(More)
Based on the excellence of mechanism mathematical model and system identification model, this paper established a mixed model of boiler-turbine coordinated control system (CCS), which combines mechanism analysis and parameter identification. To configure the model into a distributed control system (DCS) of the unit generator, by comparing the model(More)
Afire control system with space virtual feedback (SVF) is presented. The whole tracking systems is close-looped by the space virtual feedback line which is the line of sight (LOS). But the parts in the system, such as tracking subsystem and servo subsystem, run in the state of open-loop. Because the SVF tracking method is used in the system, the corrector(More)
This paper presents a solution of image mosaics for vehicle monitoring system. Image mosaics technology is used to create a wider field of view on the monitor screen. This paper discusses a new image mosaics method which can meet the demands for the application of the vehicle monitoring system. The new method adopts Harris and SIFT algorithms' advantages(More)
The highway electromechanical system is an important support to ensure normal operation of the highway. Currently, the cyclical and integral maintenance strategy was mainly adopted. In order to improve the equipment utilization and economic performance, a key equipment search algorithm based on complex network structure is presented in this paper, which(More)
Calibration systems with digital output are used to replace conventional calibration systems because of principle diversity and characteristics of digital output of electronic transformers. But precision and unpredictable stability limit their onsite application even development. So fully considering the factors influencing accuracy of calibration system(More)
Small and Medium size Enterprises (SMEs) are considered as the backbone of the manufacturing industry in China, the need for sharing and exchanging information is becoming more and more important. After analyze business environment in Southwest China, a generic conceptual framework will be developed and a prototype implementation of the generic concepts(More)
Continuous wavelet transforms of multivariable vector function spaces are discussed. In the weak topology we get the reconstruction formulas of the continuous wavelet transforms of multivariable vector function spaces produced by the integral kernel of the transform multivariable vector functions and those of it produced by the integral kernel of the(More)