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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)
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)
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)
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)
Background. There are some patients with SCLC that are diagnosed in the operating room by cryosection and surgeons had to perform surgical resection for these patients. The aim of this study is to compare the effective of pneumonectomy with lobectomy for SCLC. Methods. A retrospective study was undertaken in 75 patients with SCLC that were diagnosed by(More)
In this paper, the vacuum system of conduction cooling high temperature Superconducting Magnetic Energy Storage (SMES) is seen as the research object. The relation between vacuum degree and material deflation, temperature change is revealed by the theory analyses and experiment in the moment of vacuuming and cryogenics absorbing. The pressure of SMES vacuum(More)
For the applications of technology of camera calibration to binocular stereo vision system, the camera model in OpenCV (open source computer vision library) is discussed, the non-linear distortion of the tangential and radial distortion aberration is considered. Article gives an arithmetic of camera calibration based on OpenCV. This arithmetic makes use of(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)