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Aiming at the control problem of the dual-motor driving servo system with unknown backlash, I proposed the model of system. I designed an adaptive controller with state feedback and analyzed its stability by introducing virtual control quantity, using backstepping approach and recursively selecting Lyapunov function. The results of simulation show that the proposed control strategy don't need to know...
A measurement, about the atmosphere from the ground-based microwave radiometers with high spectral resolution, would appear to contain a large amount of information about water vapour content. In this paper, the use of Shannon Entropy in information theory and the Multi-resolution wavelet transform, which can be defined without relating to the given retrieval method, can apportion measures of resolution...
Microwave radiometer on board the FY-4 microwave satellite, which is China's second generation geostationary orbit meteorological satellite, is able to acquire temperature profiles and humidity profiles at 54, 118, 183, 380 and 425GHz. The FY-4 microwave radiometer receives the radiation emitted by the earth surface and atmospheric molecules at the five-frequency bands. A multiplexer is an important...
With the development of microwave technology and high speed DSP chips, microwave hyperspectral radiometry has attracted much attention in recent years. Many research organizations have proposed concept or developed prototype radiometers, like the one developed by Beihang University (BHU-Hyper). Its working frequency is within 50∼70GHz for the atmospheric temperature sounding. BHU-Hyper is able to...
For the control of a class of nonlinear system with bounded disturbance uncertainties, by combining robust control and backstepping control, introducing the virtual control variable, recursively selecting the Lyapunov function, offering the adaptive law of parameters estimate, I designed an adaptive controller with state feedback, and analyzed its stability. This design needs no knowledge about the...
I presented the state equation of a class of uncertain nonlinear system with bounded disturbance. By introducing the virtual control variable, combining robust control with backstepping approach and recursively selecting the Lyapunov function, I designed an adaptive controller with state feedback, and analyzed its stability. This design needs no knowledge about the uncertainty internal parameters...
Emerging as the popular choice for leading Internet companies to expose internal data and resources, RESTful Web services are attracting increasing attention in the industry. While automating WSDL/SOAP based Web service composition has been extensively studied in the research community, automated RESTful Web service composition in the context of service-oriented architecture (SOA), to the best of...
This paper proposes a two-layer hybrid scheduling scheme to fulfill the appropriate transmission of multi-class services packets in a downlink shared channel. In the first layer this scheme classifies the packets into three groups: rigid realtime, near realtime and non-realtime, on the base of analysis of the quality of service requirements of the four traffic types defined by 3GPP/3GPP2 organization,...
Prevalent approaches for automatically composing Web services (WSs) into Web processes predominantly utilize planning techniques to achieve the composition. However, many of the planning methods do not scale efficiently to large processes. In addition, they lack the capability to operate directly on the WS descriptions, and specifically on the preconditions and effects which may be represented using...
In the downlink of cdma2000 1x EV-DO system, virtual soft handoff technology is implemented through sector selection between related sectors, as a result some packets may be lost and data service interrupted during this procedure. This paper analyzes the reasons of packet loss and service delay caused by handoff in detail, and in order to reduce them we presents two ways: allocate appropriate buffer...
With the ever growing demand for varieties of multimedia services and cdma2000 networks' evolution to all-IP architecture, quality of service (QoS), which concerns users of networks deeply and ultimately exerts considerable impact on the commercialization of the cdma2000 system, is attracting more and more attention. Recently 3rd Generation partnership Project 2 (3GPP2) organization has issued a series...
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