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Link prediction in directed network is attracting growing interest among many network researchers. We propose a fast approach based on similarity to predict the links of the related nodes. In this method, we extended the Katz index to the directed network, and use the path sampling method to compute the approximated Katz index. By setting the appropriate size of the sampling, the error of similarity can be restricted to a given threshold range. Because only the information on the paths of the sampling set is required in computing the similarity score, the time cost for computation this algorithm is greatly reduced. Experimental results on real networks indicate that our algorithm can obtain results with higher accuracy in less time than other methods.

Aluminum oxide thin films were prepared by medium frequency reactive magnetron sputtering. The target voltage hysteresis behavior under different argon partial pressure and target power conditions were studied. The results indicate that the target voltage hysteresis loop of aluminum oxide thin film preparation has typical behavior of that for reactive sputtering deposition of compound films. The target voltage feedback control approach was applied to circumvent the hysteresis problem. The microstructure and chemical composition of the aluminum oxide thin films prepared at different target voltage control points were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy and Auger electron spectroscopy. The results indicated that the prepared aluminum oxide thin films, which are compact and mostly amorphous, can be obtained with target voltage control point in the range of 25~35%.

The equalization strategy simply based on cell voltage or state of charge is used in pure electric racing car. However, there is deviation in estimating state of charge or detecting cell voltage, which causes switches to open and close frequently or improperly, lowing equalization efficiency. Taking energy utilization and equalization efficiency into account, according to the actual operating characteristics of lithium batteries, we studied one new equalization strategy combined cell voltage and state of charge. First of all, one kind of lithium battery model was built and then the active equalization circuit based on the battery model was also built. Secondly, the equalization strategy was simulated. At last, one discharge experiment on the equalization module was conducted. The simulation and experiment results show that our strategy can improve energy utilization, reduce opening and closing times of switches and obtain better equalization effects. Keywords-pure electric racing car; battery consistency; battery model; equalization strategy

Regenerative brake system (RBS) has been one of the most important systems which can improve vehicle economy efficiency along with the development of clean energy vehicle (CEV), such as HEV (hybrid energy vehicle) and FCV (fuel cell vehicle). This paper provides a simple and reliable Electro-Hydraulic Parallel Brake System (EHPBS) based on the conventional vehicle brake system. This EHPBS can implement parallel distribution strategy between regenerative brake force and the hydraulic brake force thereby achieves kinetic energy regeneration. Because of the difficulty and the danger of brake system experimentation, this paper tests the EHPBS in HILS (Hardware-In-the-Loop Simulation) environment, and the experiment data prove the system to be available and effective.

This paper introduces a electro-hydraulic parallel brake system suitable for electric vehicle by changing the conventional hydraulic brake system. This structure is able to achieve the parallel distribution strategy between the regenerative brake force and the hydraulic brake force and can recover the brake energy effectively. By analyzing the simulation of the typical brake process and regenerative energy in three standard cycle modes, its feasibility and practicability are verified.

Electro-hydraulic load simulator is testing equipment used to simulate the actual torque exerted by air on the steering axle of flying object flying over through air. It belongs to the typical passive loading system, in which, in dynamic loading process, the disturbance torque generated by the rotation of steering axle will decrease loading accuracy and influence control performances of loading system. Because the highest rotation frequency of the steering axle may reach 20Hz, the loading system can not work normally with simple compensation. According to the characteristics of electro-hydraulic simulator, this paper presents a comprehensive compensation method to eliminate the disturbance torque and improve the control performances. Based on the synchro-compensation, this comprehensive compensation feeds the velocity difference between loading motor and synchronous motor forwards to realize the second discharge of disturbance torque coupling to the loading system. After founding mathematics model, the performances of the compensated system is analyzed through computer simulation. The correctness and effectiveness of the comprehensive compensation for eliminating disturbance torque are proved by experimental results.

The adaptive neural control strategy is employed for the characteristics and specifications of the middle gimbals synchrodriven by the dual electrohydraulic servo motors in the simulator with three axes, the decoupling is implemented. Simulation results show that this strategy, because of it’s self-learning and inherent nonlinear, etc.[1], makes the system present superior dynamic performance and adaptability, the superior synchromotion performance of the system has been obtained.