Struts应用的安全问题研究

对Struts应用的安全问题进行了分析和研究，通过实现Filter接口和扩展TextTag类建立了一种不影响系统性能、适应性广且能同时对web资源进行页面级和属性级安全控制的模型．在具体实现中，运用了web．xml配置文件和自定义的SecurityHelper接口．     

A ROBUST CONTROL OF A DYNAMIC BEAM STRUCTURE WITH TIME DELAY EFFECT

The objective of this paper is to present a feasible methodology that can achieve good control performance of a dynamic beam structure system with time delay effect. To achieve good control, a robust control called the modified fuzzy sliding mode control (FSMC) with phase shift method is introduced in this paper. Conventionally, the FSMC is easily designed without precise system modelling and needs very little information for online calculation. However, numerical simulation results show that increasing the time delay will reduce its performance and the system will become unstable for a large time delay. The phase shift method can assist the system in predicting the real status value as a compensation for time delay effect. The results also show improvement on both the system's robustness and stability. Furthermore, by comparing the maximum and average bending displacement reduction rates of the beam structure, it is found that the FSMC with phase shift compensation will improve the system's performance.     

The p-local ranks of finite simple groups with abelian Sylow p-subgroups

As a continuation of previous work, in this paper, we mainly study the finite simple groups which have abelian Sylow subgroups in term of p-local rank, especially a group theoretic characterization will be given.     

Experimental investigation of backward wave oscillator with low magnetic field

A backward wave oscillator (BWO) is introduced in the paper. On the accelerator of Simus-700,it is experimentally investigated. Under the condition that the electron energy is 740 keV, the beam current is 7 kA and the guiding magnetic field is at 0.68 T, the performance of 1.15 GW microwave output power at 9.1 GHz microwave frequency with 22 ns pulse width and 22% conversion efficiency are reached.