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김홍록,정원지,설상석,박상혁,이경태 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.10
Crawler-type hydraulic devices facilitate forward and backward driving of construction equipment byconverting power into mechanical energy. The existing hydraulic device performance test process is time- andlabor-intensive. This study aims to improve efficiency and productivity by automating the hydraulic deviceproduction performance test processes, which have been separately conducted so far. We also usedSolidWorksⓇ, a 3D modeling program, and ANSYSⓇ, a structural analysis tool, for structural analysis andto verify the suitability of fixing pins required for connecting a hydraulic device to performance testequipment. Our results that employing an automated hydraulic device performance test process improvesefficiency.
김홍록,서일홍 대한전기학회 2005 전기학회논문지 D Vol.54 No.6(D)
The tracking performance of optical disk drive(ODD) system can be improved using disturbance observer(DOB). But, DOB was not easily applied in the ODD system because the additional microprocessor was needed. In this paper, we propose an error-based modified disturbance observer(EM-DOB) for ODD system. Due to the simplified structure of EM-DOB, the system is easily implemented to the digital control algorithm or the analog circuit. In these algorithms, disturbances rejection performance of system can be tuned as Q filter parameters are selected. Based on analysis of sensitivity function, three guidelines of Q filter design are suggested. Experimental results of DOB and EM-DOB are evaluated under the forced disturbances.
김홍록(Hong Rok Kim),윤기운(Gee Woon Yoon) 한국사회체육학회 1995 한국사회체육학회지 Vol.4 No.-
The purpose of this study was to examine how recreational sport involvement effects self-esteem and anxiety for Unversity students. The subjects in the study consisted of 471 Unversity students. The instrument was used Self-rating Anxiety Scale(Zung, 1971) and Self-Esteem Scale(Rosenberg, 1965). Four-way analysis of variance were conducted to determine if there were differences for self-esteem and anxiety as a function of playing experience, sex, frequency, prolonged time. The results of this study were as follows. First, sport involvers had better Self-esteem and Anxiety than Non-sport involvers. Second, the effect of sport involvers as a function of sex was significant for Self-esteem and Anxiety Third, the effect of sport involvers as a function of prolonged time was significant for Self-esteem, but was not significant for Anxiety. Fourth, the effect of sport involvers as a function of playing experience, frequency was not significant for Self-esteem and Anxiety. In conclusion, recreational sport involvement should be advocated because of the possible psychological benefits such as increased self-esteem and decreased anxiety.