基于PWM温度控制系统，程序采用PWM方式，能够稳定控制波动度在0.5度内。-PWM temperature control systems, procedures using PWM mode, stability control to the volatility within 0.5 degrees.

Abstract Advantages and limitations of the existing models for practical forecasting of stock market volatility have been identified. Support vector machine (SVM) have been proposed as a complimentary volatility model that is capable to extract i