Design and implementation of security in the system which is developed by VB was presented. The security is very importment for any application, moreover, it is an importment measure that set secret code to user interface to guarantee the security of a system. The main purpose of this paper is to introduce, according to some algorithm, how to encrypt user secret code, how to protect the encrypted data and how to come true in VB.
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According to the different requirement of simulation modeling, introduces the control algorithm of PID controller and some assistant functions.
根据仿真建模的不同需要，介绍了PID调节器的控制算法及一些辅助功能。
First, the algorithm constitutes layered bounding box tree according to some rules, when making collision detection, the detection results of last time, will produce speedup effect.
该算法首先按照一定的规则建立起树形分层包围盒，在碰撞检测的时候，可利用上次的检测结果，起到了加速的作用。
According to the geometric features of synchronization position of answer card and structure element, some improvement on the original algorithm was made and the separating speed was decupled.
根据标准答题卡同步位和结构元素的几何特点，对算法进行了改进，将分割速度提高到原来的十倍。
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