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A general 2-port block diagram with 12-term error matrixes is presented for the calibration of a 4-port vector network analyzer(VNA). Extending the classical 12-term error model to describe the 4-port network analyzer, all the coefficients in signal paths are replaced by the complex square matrixes and the nodes correspondingly become complex vectors. The scattering matrix can be solved from the forward...
In this paper, we propose and analyze a new GPS positioning algorithm. Our algorithm uses the direct linearization technique to reduce the computation time overhead. We invoke the general least squares method in order to achieve optimality in the situation when the trilateration system of equations becomes over-determined. We systematically evaluate our new algorithms and show that they indeed take...
In the research of EPA temperature transducer, Platinum temperature-resistance is used as forward transducer input. Because standard format of R-t is a quartic equation on t when temperature is between -200 and 0 centigrade, a suitable method must be found so that we can calculate the temperature value online. On the same time, this method should be easy to realize and fit to be applied in embedded...
The most vicious ventricular arrhythmias are thought to underlie the majority of sudden cardiac death. Computer simulations based on complex mathematical models have been widely used to reveal their mechanisms. To solve these models with high accuracy and less computing time consumption are what people look for. In this paper a new numerical method was studied to integrate the cardiac electrical conduction...
In this article, an innovation pole is defined as a regional industrial innovation subsystem producing dense innovative activities, being representative in innovation scale, and driving the development of regional economy. We regard the regional innovation system as a symbiosis evolution system of the multi-innovation poles. Then, using of the theory and methods of ecology, this article analyses the...
This paper presents an integral sliding mode control method with integral switching gain for the position trajectory of magnetic levitation apparatus. The magnetic levitation system is open loop instable, and it is a nonlinear dynamic system in nature. Many kinds controllers are proposed to face this challenge. Those controllers shall be robust enough to overcome the variations of system parameters...
In this paper, we propose the expected schedulability to characterize the schedulability for the stochastic tasks on a single real-time computer processor. Our results show that the stochastic model has more flexibility to characterize the real-time tasks than the deterministic model. The expected schedulability is related to the real-time t at tasks arrival and may show that a sub-set of task would...
In order to miniaturize irradiation accelerator, a new microwave-absorbing structure - collinear load, instead of traditional waveguide load, is adopted to absorb remnant microwave power. Collinear load depends on the film conglutinated on walls of accelerating cavities by flame spraying process and so on. To research on the properties of the alloy thermal-spraying coating, homogenization theory and...
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