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An improved hybrid method of backward shooting and bouncing ray (SBR) physical optics (PO)/physical theory of diffraction (PTD) is proposed to investigate the backward scattering from a three-dimensional electrically large target. The basic idea is to combine the forward-ray-tracing technique to accelerate the original backward-ray-tracing one. The proposed method significantly reduces the computational...
The data model is one of the core problems in the field of XML data management, but at present the research on management of uncertain data supporting multi-dimensional continuous random variables has been limited. An extended data model supporting multi-dimensional continuous random variables was proposed based on the existing model. The new model made the continuous uncertain XML no longer confined...
Initial configuration effect is investigated for a both highly accurate and highly diverse biased heat conduction method. According to the individual object degree, we assign a heterogeneous initial resource for each object. Experimental results obtained from the MovieLens dataset show that, the proposed method outperforms the standard heat conduction method by 47.33%, and also outperforms an accurate...
The paper investigated the feasibility of Hyper spectra to determine the concentration of soil organic matter (SOM) in Harbin. The 95 soil samples were collected to a depth from 0 to 20cm. Reflectance measurements from 350nm to 2500nm were collected in a controlled laboratory environment. Three multivariate techniques (stepwise multiple linear regression(SMLR), artificial neural network(ANN), partial...
This paper proposes a new strategy which combines the principle of golden and the quasi-Newton iterative method, when search peak and estimate the LFM signal's parameters with fractional Fourier transform. The new strategy set the step value in the golden section when search the LFM signal FRFT's peak, and then take advantage of the quasi-Newton iterative method to accurately estimate the LFM signal's...
Starting from the theory of MT, the paper gives an introduction for the current research status quo and the systematic principle of the high precision electromagnetic frequency spectrum(MES). It puts forward a linear relation that can be regarded as between exploring depth and electromagnetic frequency in local area, which makes it feasible that the stratum resistivity corresponds to the sounding...
Due to the nature of distribution and self-organization, Mobile ad hoc networks rely on cooperation between nodes to transfer information. Therefore, one of the key factors to ensure high communication quality is an efficient assessment scheme for risks and trust of choosing next cooperative potential nodes. Trust model, an abstract psychological cognitive process, is one of the most complex concepts...
Aim to avoid the deficiency of huge computation load and resource use in conventional fixed-point loop control method, base on the study of signal tracking method and accuracy of navigation receiver, an improved one is proposed, along with theoretical analysis and actual verification of the accuracy loss of signal tracking compared to the floating-point loop control method from the following two aspects...
This paper presents a new load forecasting system based on the complex system theory. The power network is a complex nonlinear system. The complex system analysis theory is applied to divide a power network into some sub-system according to its different area position and load type, and then uses the BP neural network incorporated with weather influence factors forecast the load value respectively...
Based on the line balancing, the assembly process of the automobile gearbox was analyzed. By using the Method Study in the line balancing - Program Analysis, the entire assembly process was studied to readjust the bottleneck process. The operation time is reduced and the assembling progress is optimized as the result of the readjustment, and the result can provide reference for the line balancing...
One of the main challenges faced by the current face recognition techniques lies in the difficulties of collecting samples. In the situation of law actualizing, passport or status validating, only one sample per person is available. Unfortunately, many reported face recognition techniques rely heavily on the size and representative of training set, and most of them will suffer serious performance...
Due to the rapid spread of botnets distributed denial of service attacks have become more and more frequent and fatal. Many researches have been done in the virtual environment to detect and defend such attacks. But a data flow is essentially needed to verify these researches in a real environment. This paper proposes a simulation platform of distributed denial of service attacks based on network...
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