DC motors are important industrial products. Directly starting a DC motor will harm the motor and the dragged equipment. This article has designed a DC motor control equipment of soft starting, stopping and many protections functions resting on the DC motor control principle and PWM technology. The advantages of this equipment are starting the DC motor continuously and smoothly, low impact torque and impact current, easily controlled, good repeatability, and small volume.
UFS is the most important file system of the Unix OS and has been widely applied. Adequate understanding of its working principle and organization structure is the key that the computer forensics been successfully applied to this file system. Based on deep analysis of the system architecture and file access flow, this paper has proposed and realized a technology to analyse UFS file system and explored the data recovery thought. It provides forceful support for computer forensics technology applying to UFS .
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