According to the unknown control direction strict feedback nonlinear systems, this paper introduced a design process for time-varying nonlinear adaptive controller by introducing the Nussbaum increasing and the dead a...
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According to the unknown control direction strict feedback nonlinear systems, this paper introduced a design process for time-varying nonlinear adaptive controller by introducing the Nussbaum increasing and the dead area revision algorithm. Its stability is proved and analyzed, and its simulation is designed with the LMI MATLAB toolbox, the result shows that the controller has a good performance.
For multimedia applications, the routing algorithms should consider many Quality of Service (QoS) parameters. However, to find routes with two or more QoS parameters is an NP-hard problem. Therefore, recently many res...
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In autonomous distributed robot systems, many robots cooperate together to carry out many difficult tasks that single robots cannot realise. But, in order to cooperate together the robots should communicate with each ...
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A new frequency offset estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems was proposed by using a specially designed training symbol. Requiring only one training symbol, this algorithm ...
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A new frequency offset estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems was proposed by using a specially designed training symbol. Requiring only one training symbol, this algorithm can efficiently estimate integer frequency offset and fraction frequency offset. The timing synchronization can also be obtained by using the proposed training symbol. Simulation results show that the proposed method not only reduces the number of the training symbols but also improves the accuracy of frequency offset estimation, while comparing with conventional algorithms.
The combination of the chaotic theory and the cryptography is an important study field of the image encryption. Classical Arnold cat map can change the position of image pixel points through iteration, but these pixel...
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In this research, we propose and develop a remote medical-care support system for supporting nurses, care managers and care helpers during their work. The proposed system has two functions: a multi-point communication...
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Vector controltechnology is regard as a kind of controlling manner of AC asynchronous motor, and it is already become the first method of the high-performance variable-frequency speed regulating system. Compared with...
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ISBN:
(纸本)142440813X
Vector controltechnology is regard as a kind of controlling manner of AC asynchronous motor, and it is already become the first method of the high-performance variable-frequency speed regulating system. Compared with SPWM, SVPWM (Space Vector Pulse Width Modulation) has been used widely because it has better performance. This paper introduced the basic principle of voltage SVPWM and vector control. A full-digital solution with TMS320LF2407 using simplified SVPWM control method is presented. Through the experiment of controlling to a practical motor, the resulted shows that this method is feasible, the controlling system has better dynamic and static performances and controlling effect, it would have a prospect widely used.
Taking the 90-100 nm hollow column Al2O3 film as the base plate, the CuCl2/CuPc sensor chip with the φ0.2 mm micro channels was designed and manufactured by using MEMS micro-machining method. By vacuum coating, CuCl2...
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Taking the 90-100 nm hollow column Al2O3 film as the base plate, the CuCl2/CuPc sensor chip with the φ0.2 mm micro channels was designed and manufactured by using MEMS micro-machining method. By vacuum coating, CuCl2 hybrid ornamenting CuPc was evaporated to form the gas sensitive film, and through the micro shell packaging of it, the microstructure sensor was manufactured. This made the detecting mode of active air suction availiable, and the response time and gas sensitivity increased. SEM analysis showed that the better surface appearance and film dimension were obtained: the Al2O3 film-base plate is 0.25mm in thickness;its flank is a columnar compact body;its surface appears 990-100 nm nanophase-pore active state. The Pt films used as the electrode and the heater are 500nm in thickness, arranged columnarly and densely. The sensitive film is 150nm in thickness with continuous and normal arrangement. The micro shell is 150-200 μm in depth. The testing result indicates that the sensor has well sensitivity to Cl2, which is more than 5 times of that when the Cl2 concentration is 0.01%. The sensor's response time is less than 30s. The impacts of aerating state and heating voltage on the sensor's sensitivity were analyzed and the sensitive mechanism of CuPc organic semiconductor was discussed.
A new approach in optical burst switching (OBS) networks with QoS support is presented in this paper. In the approach, the data channels of an outgoing link at a core node are divided into multiple groups, with each g...
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A new approach in optical burst switching (OBS) networks with QoS support is presented in this paper. In the approach, the data channels of an outgoing link at a core node are divided into multiple groups, with each group corresponding to a service class. The number of data channels in each group is mainly determined by data traffic. In general, a data burst (DB) can be sent on a data channel reserved by its burst head packet (BHP) only in its own group. Upon failing to reserve any bandwidth in its own group, the BHP tries to re-reserve even preempted bandwidth on a data channel in a lower-priority group. A lower-priority BHP can't reserve bandwidth on any data channel in a higher-priority group. In addition, the reasonable relation between the preempting DB length and the preempted DB length is also investigated in this paper.
In this study, experiment set up for engineering students is proposed. The experiment using the proopsed set up consists of the model computer, internal parts for theoretical test, external parts for input/output exam...
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In this study, experiment set up for engineering students is proposed. The experiment using the proopsed set up consists of the model computer, internal parts for theoretical test, external parts for input/output examination and exclusive assembler. Students try to design a logic circuit and implement the logic circuit on FPGA (field programmable gate array) board using hardware description language (HDL). The test circuits of clock generator, ALU, accumulator, program counter, instruction register, memory, I/O ports, and controller were also designed.
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