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This paper proposes a combination technique of the frequency-domain random demodulation (FRD) and the broadband digital predistorter (DPD). This technique can linearize the power amplifiers (PAs) at a low sampling rate in the feedback loop. Based on the theory of compressed sensing (CS), the FRD method preprocesses the original signal using the frequency domain sampling signal with different stages...
When it comes to the navigation tool for minimally invasive surgery, electromagnetic tracking has prominent advantages and features over the traditional endoscope and X-ray imaging. The electromagnetic tracking system using two DC pulsed independent rotating coils to generate two changing magnetic fields alternately can track the position and orientation of the magnetic sensor based on an non-iterative...
School news information system breaks through and exceeds the traditional news communication conception, and provides audiences with new taste in vision, hearing and sense. CZ college has excellent conditions in many aspects, but lack of school news information system has become the development obstacle of CZ college. School news information system for CZ college is regarded as research object in...
System visit quantity forecast is the basic aspect which needs consider when develops the basic aspect which needs consider when school news information system is developed, and is important function of the system. In the paper, effect factor of visit quantity of school news information system is analyzed, and visit quantity is forecasted. Different person amounts are respectively forecasted with...
Affected by many factors, The Chinese car industry is difficult to conduct a thorough analysis in the traditional ways. With the simple giant system entropy analysis, this paper will conclude the development of the Chinese car industry by analyzing its market efficiency and the market share using the DEA and the data of main car manufactures.
In this paper, a novel multiscale speckle suppression method is proposed for ultrasonic images. An original image is transformed into a multiscale curvelet domain and the thresholding estimators are derived for processing the curvelet coefficients of detail subbands by successively combining the SURE-LET approach with the neighboring windows. In order to reduce the curvelet-like artifacts, the shrinkage...
Ultra-wide spectrum (UWS) pulser, in which avalanche transistor is used as its switch, can generate high-repetition and -stability short-pulse, but its power is sharply lower than that of SOS and Tesla generators. Marx circuit is used to increase the power of this type of pulser. Different charged-capacitance and class of Marx circuit determines different waveform and peak-power of output pulse. 20-class...
A numerical simulation model for gasoline engine was established by GT-POWER in order to study the NOx emissions characteristic of vehicle engine fueled with M15 (the methanol and the gasoline in volume ratio 15 : 85) and was validated by experimental data. Based on the model, the variable parameters study including air-fuel radio, compression radio and ignition advance angle were carried out. The...
In this paper, a model was built using visual.studio.net.2005 to represent the relationship between Perms and different aspects of the cushion, such as cell radius, cell number, cell height, outlet number, outlet diameter, material elasticity as well as driver's weight of the seated area. By analyzing these varied relations, each parameter's effect on comfort performance was determined according to...
Forest fire patrolling vehicle is a kind of special vehicle that travels under off-road condition in forest. It should have better handling characteristics. In order to evaluate handling characteristics of a forest fire patrolling vehicle, a two degrees of freedom mathematical analytical model is built and steady state response characteristic is analyzed. Apart from the mathematical model, multi-body...
A novel ultrasonic flow velocity estimation method employing the two-dimensional (2-D) frequency shift track is proposed. By representing the backscattered echoes from human blood in the 2-D frequency domain, this paper shows that the velocity profile measurement using pulsed-wave Doppler ultrasound and the moving target track in image processing are isomorphic problems. Therefore, feature template...
As a novel multi-scale analytical technique, curvelet transform is developed to propose a better sparse representation of images with singularities along curves. Speckle noise is a natural property in medical ultrasound images, which often result in blurred image features. Therefore, speckle noise reduction is a significant and delicate research subject in medical images processing. In this paper,...
In order to improve the performance of double wishbone suspension in patrolling forest fire vehicle, based on advanced and efficient Functional Virtual Prototyping (FVP) technology and ADMAS software, the model was established, simulation evaluation and optimization deign for this system were realized in this paper. The results showed that, through optimize the suspension system, the key parameters...
Collaborative learning is a special group learning activity. In Internet environment, it has been well applied and developed in practice with its advantages of supporting active learning and deep-processing of information, which has received more and more attention from people. This article sets forth the characteristics, structure and advantages of task-oriented collaborative learning model in Internet...
Front suspension system's dynamics behaviors simulation model for a forest fire patrolling vehicle was built by using ADAMS/Car in order to evaluate handling stability of the vehicle. The wheel parameters of the vehicle which affect vehicle's handling performances were simulated and analyzed. The relationship between the wheel parameters, such as the camber angle, toe-in angle, kingpin inclination...
The model of all terrain vehicle and steering system is built up by use of SolidWorks which is 3D mechanical design software. The parameters of all terrain vehicle are necessary. The real movement state of steering system is simulated through virtual simulating tool ADAMS. The movement state and performance are tested. The results verify the design of vehicle is logical and steering system is smooth...
In this paper, we pay our attention to the multiscale kalman algorithm based on correlation structure of the discrete wavelet coefficients for the restoration of the GPS common-view observation data. Based on the hypotheses of that the GPS common-view observation data being pretreatment possess of 1/f fractal characteristics. In this condition, we estimate the Hurst parameter of GPS clock difference...
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