飞机交流发电机是飞机电源系统中最重要的部件，其工作状态直接影响到飞行安全。在维护工作中，对发电机的输出信号进行异常检测，是发现发电机异常的常用手段，对及时排除故障隐患，保证飞行安全十分重要。本文借鉴计算机安全领域出现的人工免疫系统思想，采用欧氏距离在实数域进行匹配计算，实现了一种用于飞机交流发电机输出信号异常检测的负向选择算法。初步计算结果表明，该方法可有效检测出飞机交流发电机的输出异常。

衍射计算是设计光盘光学系统的基础。由于光盘信息符（坑点）尺寸可以和波长相比较或更小，标量衍射理论的有效性必需进行检验。首先分析了标量衍射理论的能量计算误差。对于典型的坑点尺寸，标量理论的能量计算误差高达19%。然后用耦合波理论分析了入射波偏振态的影响。计算表明TM 波和TE 波的衍射特性与标量理论的结论相差较大，TM波和TE波的衍射行为也有差别。这种差别是由电磁场边界条件引起的，且会随着坑宽的缩小而增大。对于DVD，标量理论的误差已经很大，要得到准确的结果就必须采用矢量衍射理论。

存储区域网是一种新的网络存储体系结构，通过集中管理机制和采用光纤通道作为传输协议，满足了海量信息的存储和快速传输的需求，比传统的直接连接存储模式具有更高的性能、可靠性和扩展性，成为存储领域重要的研究方向。文章介绍了存储区域网的技术特性和构建方法，给出了一个实际的存储区域网的结构，并对此存储区域网进行了性能测试，探讨了实际应用情况下存储区域网的传输性能和优化方法。

In many real-time fields the sustained high-speed data recording system is required. This paper proposes a high-speed and sustained data recording system based on the complex-RAID 3+0. The system consists of Array Controller Module (ACM), String Controller Module (SCM) and Main Controller Module (MCM). ACM implemented by an FPGA chip is used to split the high-speed incoming data stream into several lower-speed streams and generate one parity code stream synchronously. It also can inversely recover the original data stream while reading. SCMs record lower-speed streams from the ACM into the SCSI disk drivers. In the SCM, the dual-page buffer technology is adopted to implement speed-matching function and satisfy the need of sustainable recording. MCM monitors the whole system, controls ACM and SCMs to realize the data stripping, reconstruction, and recovery functions. The method of how to determine the system scale is presented. At the end, two new ways Floating Parity Group (FPG) and full 2D-Parity Group (full 2D-PG) are proposed to improve the system reliability and compared with the Traditional Parity Group (TPG). This recording system can be used conveniently in many areas of data recording, storing, playback and remote backup with its high-reliability.