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A novel nonunit transient-based protection scheme for bipolar high-voltage direct current (HVDC) lines is proposed. The protection scheme is composed of a starting unit, a boundary unit, a directional unit, a faulty pole identification unit, and a lightning disturbance identification unit. The prototype based on the proposed scheme is developed and its performance is evaluated through a hardware-in-the-loop...
Residential building explosion caused by gas leak takes place every year. The explosion leads to a lot of injures even dead since it usually results in the partial collapse of the building. An automated approach to detecting the gas leak to keep the residents safe is thus of utmost importance. In this paper, we present the design of Gas Mon, a wireless sensor network system for gas leak monitoring...
Increasing attention has been paid on Vertical Axis Wind Turbine (VAWT) to improve the poor aerodynamic performances. In this paper, we obtain the aerodynamic coefficients of blades by the method of simulation and experiments, and present along with a prototype of Variable-pitch VAWT. Then, mathematical model and dynamic model have been built, and individual active control for computing the optimal...
To improve dredging efficiency and expand transportation, trailing suction dredger with shuttle barge moored at one side is applied in long distance reclamation projects. Line arrangement and line tension estimation method is established for prototype testing of this new technique. The variation rule of line tension in different operation stage is studied and a program working on optimal relative...
Little attention has been paid to the study of optimum variable-pitch control laws in the range of low tip speed ratios, as traditional Darrieus turbines operate in the range of high tip speed ratios. In this paper, we obtain the aerodynamic coefficients of the plate airfoil by the method of computational fluid dynamics (CFD). Then, an aerodynamic model is built based on Blade Element Theory, and...
Buffer overflow vulnerabilities can cause attacks that result in serious consequences. However the techniques of buffer overflow vulnerability detection are limited to manual analysis, binary-patch comparison, fuzzing and so on. They rely on manual analysis, thus cause high overhead. In this paper, we propose a novel method of detection of buffer overflow vulnerabilities, which is based on fuzzing,...
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