Since there are weld defects in welds, using traditional strength theory based on no defect and no crack to design, crane's security in rating load can't be insured.

由于在焊缝部位存在焊接缺陷，采用传统的建立在构件无缺陷、无裂纹基础上的强度理论进行设计计算时，往往不能确保起重机在额定载荷下使用的安全性。

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An alarm system for security guarding designed with FPGA is discussed in this thesis, and the theory and structure as wall as the design for VHDL module are also given bellow.

文中讨论利用FPGA设计的用于安全防范的报警系统，讲述系统的原理与结构，给出VHDL的模块设计。

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First, security problems faced by mainstream OS that haven't enhanced security mechanism are analyzed in detail, and the limit of traditional design theory is concluded too.

本文详细分析了未经安全增强的主流操作系统所面临的安全问题，对安全操作系统设计理念的局限性进行了总结；

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