基于子波变换提取全波列声波测井信号波前的新方法

本文把平滑过渡信号作为全波列声波测井信号中的各种波的数学模型，研究了其连续子波变换的波形特点，提出了一种提取其起始点的新方法．利用此方法可以精确地提取全波列声波测井信号的滑行纵波、滑行横波及斯通利波的波前。     

一种利用子波变换多尺度分辨特性的信号消噪技术

本文基于传统信号处理方法对非平稳信号的局限性，利用子波变换下奇异信号和随机噪声在多尺度空间中不同的模极大值传播特性设计了一种实用的子波消噪方法，对不同信号的仿真结果表明该方法既能提取一定的信噪比改善增益，同时又能保持对突变信息的良好分辨率，适合于一类非平稳信号进行时变处理．     

Some cautions in large-scale system design and implementation

Virtually all large-scale system implementations will benefit from the application of certain management techniques. Awareness (and avoidance) of erroneous assumptions as to system requirements and objectives, data reliability, human interface, and testing methods is important. Strategies such as phased implementation, use of pilots and packaged software, and categorizing and reducing risks are useful. Knowledgeable selection of applicable developments in computer architecture and serious use of planning and control techniques are advocated.Today's trends include well-informed users, better hardware and networking facilities, analysis and study of alternatives, and heavy user involvement in the entire system design and implementation process.