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The instability disaster prediction model of tailings dam had been established, based on system analysis of the factors that caused the instability disaster of tailings dam, by selecting 6 prediction index, medium unit weight, cohesion, internal friction angle, slope angle, slope height and pore pressure ratio and combining with using theory of the rough set and neural network. First the rough set...
Ad Hoc network is a newly developed network without fixed infrastructure and a changing topology. Its vulnerability makes it prone to attacks, which brings greater challenges for intrusion detection for Ad Hoc. Through analyzing the existing intrusion detection techniques as well as the characteristics of Ad Hoc network, this paper has proposed an intrusion detection technique based on class association...
It is an important approach to locate the centre in circle projection, the accuracy and speed of the central location will affect the recognition rate and the speed of the character recognition. In order to improve the accuracy and speed of the central location, this paper proposes a new algorithm, based on the theory of the triangles and quadrilateral. And also this algorithm implements an invariant...
Worst-case execution time (WCET) analysis is one of the major tasks in timing validation of hard real-time systems. In complex systems with real-time operating systems (RTOS), the timing properties of the system are decided by both the applications and the RTOS. Traditionally, WCET analysis mainly deals with application programs, while it is crucial to know whether the RTOS also behaves in a timely...
This paper proposes an adaptive evolutionary system for active noise control (ANC). The conventional ANC system often utilized filtered-X LMS (FXLMS) algorithm to update the coefficients of the linear finite impulse response (FIR) filter for its simplicity; while the FXLMS algorithm may converge to local minima. This paper uses evolutionary idea, substituting FXLMS algorithm, to prevent the local...
The paper proposes a novel wind energy generation scheme, which is based on an indirect matrix converter(IMC) and a permanent magnet synchronous generator(PMSG). This method is different from the ones concerned in the past literatures due to its unique system configuration and easy-to-implement control strategy with more degrees of freedom to be exploited. Sensorless MPPT, which is based on the combination...
This paper aims to explore the optimal Li-ion battery charging frequency by using AC impedance technique. The experiment proves that the optimal charging frequency is the point of the minimum AC impedance. In such a situation of the battery charged by the optimal charging frequency, the charging time and charging efficiency are improved above 30.68% and 30.6%.
The double line-to-line voltage synthesis of matrix converter is based on the instantaneous value of the input line-to- line voltage. And the obvious advantage of this modulation strategy to automatically suppress the imbalance of the input voltage makes it excellent in the modulation strategy of the matrix converter. Considering the EMI issue in driver system based on matrix converter, common mode...
Clock synchronization is an essential problem faced by packet transport network. PTP (precise time protocol) can be used to solve this problem. Its feasibility has been verified by related literatures. In this paper, we use the OPNET simulation platform to further study the key factors affect the clocks' accuracy of packet-based synchronization schemes, e.g., queuing disciplines, number of nodes that...
In this paper, the niche breadth and overlap value of dominant species is calculated and analyzed along the community gradients to study population dynamics in the protection forest, Xinjiang, China. The main results are as follows. After four years, the amount of populations are increasing as a result of some local species naturally occurred or invaded. And seven dominant species including three...
With the popularization of e-commerce in recent years, customer relationship management (CRM) has gained much attention. Many companies have initiated projects to improve on customer orientation and plan the implementation of CRM systems. Among the desired benefits are increased customer satisfaction and retention by providing personalized products and value added services. With the aid of data warehouse,...
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