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Improvement of Hard Disk Drive’s Arm Bending Machine using Fuzzy Logic
Settha Tangkawanit,Somyot Kaitwanidvilai,Surachet Kanprachar 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Hard Disk Drive’s arm (HDD’s arm) is one of the key elements in the HDD assembly. This element has to have the height of the arm measured from the reference be in the required range. To get such requirement, HDD’s arms have to pass to a bending machine in order to measure and adjust the height of the arms accordingly. Currently, if needed, a pre-defined bending force is applied to the arm. In this paper, the fuzzy logic rule to control the bending force is proposed. From the experimental data, it is found that the performance of the proposed technique in terms of the process capability index of the arm height error is superior to the conventional technique.
Phongnawin Benprom,Chairat Pinthong,Somyot Kaitwanidvilai,Issarachai Ngamroo,Surachet Kanprachar 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Genetic algorithm (GA) has been shown to be an alternative for achieving suitable subcarriers in subcarrier multiplexing (SCM) on multimode fiber. Because of the relatively-flat frequency response at high frequency range of the multimode fiber, the suitable subcarriers can be determined by applying GA to many divided frequency ranges simultaneously; that is, Parallel GA. In this paper, parallel GA is adopted for searching suitable subcarriers in SCM on multimode fiber. Thirty suitable subcarriers, which are not located at any nulls in the frequency response of multimode fiber, are determined. These subcarriers are then used for transmitting many subcarrier signals through the high frequency bands of multimode fiber resulting in a total data rate of 15 times larger than the data rate obtaining from the 3-㏈ intermodal bandwidth.