雅虎性能准则指定静态的资源应该有一个未来的过期头。
Yahoo! performance guidelines specify that static assets should have far-future Expires headers.
通过在线辨识被控对象，采用二次型性能准则优化PID参数。
This method can optimize the PID parameters by using the quadratic performance index and identifying the controlled object parameters on line.
通过计算机计算各种积分性能准则的调节器参数，可知“工程最佳”并不是最佳的设计方法。
Computer can calculate adjuster parameters of various integration feature principles. It is known that "engineering optimum" is not the best designing method.
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