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IP geolocation services are playing an increasingly important role in Web applications. Landmark-based IP geolocation can gain better IP geolocation performance. However, the accuracy of landmarks is still an urgent issue to address. The paper proposes a filtering landmark mechanism to guarantee the accuracy of landmarks. First, a Ping-Delay Coarse Filtering Landmark algorithm (PCFL) is proposed to...
The level control system by multi-point real-time detection is designed in this paper based on the fuzzy self-adjusting PID algorithm. It is applied in the non-probe near-field optical microscope. Capacitance-to-digital converter chip AD7746 is used to converted capacitance value which is proportional to the distance between code plate and platform into digital value in the micro-positioning platform...
A 5-axis milling machine has a lot independent geometric error components when the machine tool is considered as a set of five rigid bodies. The identification of the deterministic component of the systematic error is very important. It permits one to improve the accuracy close to the repeatability of the machine tool. We developed ultrasonic profile measurement of workpiece to improve the machining...
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