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To resolve the problem of the non-integrability of non-linear dynamic equation, the concept of “time-status space” is introduced, and the integrated function is expanded as Taylor series of independent variables at initial status in the space of time-status. And then, the non-linear dynamic equation is changed to be integrability, and the any order approximate solutions for independent variables of...
In this paper we present a framework and a set of algorithms for determining faults in networks when large scale outages occur. The design principles of our algorithm, netCSI, are motivated by the fact that failures are geographically clustered in such cases. We address the challenge of determining faults with incomplete symptom information due to a limited number of reporting nodes in the network...
In recent years, cognitive radio technology (CR) has been proposed to allow unlicensed secondary users (SUs) to opportunistically access the channels unused by primary users. As a result, there is a lot of recent interests on studying cognitive radio cellular networks (CogCells) that can support both PUs and SUs. Due to the limited transmission range of SUs, in this work we consider supporting Multi-hop...
The commodities price evolution is a very interesting data for shopkeepers selling online. By using the Web mining can get more and more data in everywhere such as e-supermarkets and e-commerce. This paper shows a case study for the price extracting of mobile phone selling online. Extracting the commodities price to get the price trend using the uncompleted data is researched. The forecast algorithm...
The mathematical modeling and simulation based on the Modelica language usually gets a high-index differential-algebraic equation (DAE) system. The structural index reduction algorithms can serve as a fast method to reduce such high-indexed issues. In order to solve the failure of the structural index reduction algorithms in some cases, the combinatorial relaxation algorithm is analyzed and studied...
Turbo product codes (TPCs) have been studied since 1994. However, existing decoding algorithms for TPCs are generally based on the algorithm presented by Pyndiah [1], which adopts the idea of MAX-Log-MAP algorithm and neglects the channel side information (CSI). In this paper, we present and investigate the "M-Log-MAP" decoding algorithm that considers multiple codewords in calculating the...
Cloud computing derives from the concepts of distributed computing, parallel computing and grid computing originally. Today, more and more commercial organizations and academic institutes join in the area of cloud computing for safety and low spending reasons. With plenty positive advantages, system virtualization is becoming a prevalent technology to build underlying infrastructures in virtualized...
In the case of mutual coupling the DOA (Direction of Arrival) and adaptive beam forming algorithms are analyzed. In practice the mutual coupling between the array elements can not be avoided. Thus the precision of DOA and beam forming performance are affected because of the change of array response vector aroused by the mutual coupling. The algorithms of DOA are deduced with the equivalent network...
Leakage current (LC) and environmental data online monitoring system are installed in 6 substations in Shenzhen, which can measure simultaneously post insulators LC and environment temperature, humidity, wind speed, rainfall amount and wind direction. This paper presents the predict results of LC from the environmental data using linear and nonlinear regression. The results show that although the...
To develop a robot system which can implement search and rescue work, an assisted driving mechanism which can automatically pull flexible cable of rescue robot into ruins is researched. The system is formed by two parts. The driving part is designed by principle of friction wheel to drive the rescue robot. The supporting part is formed by planar four-bar linkage which can be opened and tightened....
Period water balance principle is often used in reservoir flood dispatching calculation and iteration is the main algorithm. However, this method's cumulative error is very large and can not be eliminated because of precision control and other reasons. In this paper, the author improves the conventional iterative algorithm and proposes cumulative water balance flood dispatching algorithm, which can...
According to the real options theory, the opportunities in the decision-making of FDI would be regarded as the real options belonging to the multinational enterprise(MNEs). Facing the market and technology uncertainty, there are options to defer investment and growth options contained in the opportunity of FDI. When the value of options to defer investment increases, MNEs have motivation to delay...
The traditional power droop controllers are commonly used in distributed generation (DG) units to share the loads among the parallel inverters. However, the parameters of the power transmission and distribution line in microgrid are small and generally presented high resistance-to-inductance (R/X) ratio which will seriously influence the performance of the traditional power droop controller, even...
Signal integrity (SI) simulation for system-in-package (SiP) is a bottleneck in SiP design flow. This paper presents a novel numerical algrothm for SI simulation in packaging structure. This algorithm is based on 2D Generalized Transmission Line Equation (GTLE), Finite Difference Time Domain (FDTD) and mesh division technique. SI is simulated using mesh division technique where the model of SI is...
In high-speed applications, electronic packages usually contain multilayer power-ground planes with large number of P-G vias to provide a low-impedance path for the power distribution system between the PCB and the die. The transient current injected into the P-G planes can induce unintentional voltage fluctuations in the power distribution network of the packages. The undesired voltage fluctuations...
Taking the small unmanned four-rotor as a research object, the dynamic model of the small four-rotor was built according to Newton-Euler formaLism. Adaptive Inverse Control (AIC) Theory was used in the control of the small unmanned four-rotor for the first time and the attitude stabiLization control of the small unmanned four-rotor was reaLized on the experimental platform. The simulation results...
This paper considers the tracking control problem of LEO formations subjected to unknown disturbances consisting of J2 and air drag. The full nonLinear relative dynamics of the follower with respect to the leader are used to develop an adaptive control law to account for unknown disturbances. The disturbance estimation is derived using a Lyapunov-based method. The combination of the disturbance estimation,...
This paper attempts to present an optimal design strategy and characteristics of high-power density and high-efficiency induction motor (HDEIM) for hybrid electric aircraft. The structures of stator lamination and layout of stator windings are analyzed. And how PWM influences the performance of the motor insulation is presented. Moreover, how to calculate air-gap length, eliminate tooth harmonic influence...
The controller design of the drag-free satelLite on near-earth orbit is the researching object. After analyzing the characteristics of the main disturbances affecting the drag-free satelLite, the disturbance model is estabLished. Adding the disturbance to the system, a disturbance observed based dynamics model of the drag-free satelLite is built. Then the mixed controller is designed and the LMI form...
Linear equations with large spare coefficient matrices arise in many practical scientific and engineering problems. Previous sparse matrix algorithms for solving linear equations based on single-core CPU are highly complex and time-consuming. To solve such problems, aiming at Jacobi iteration algorithm, in this paper we firstly implement a sparse matrix parallel iteration algorithm on a hybrid multi-core...
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