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공학중심 Reading & Maker교육 프로그램 개발
박정호,Park, Jungho 한국정보교육학회 2019 정보교육학회논문지 Vol.23 No.2
The fourth industrial revolution era calls for the ability to solve problems creatively based on basic literacy for technology. These capabilities can be enhanced through the maker education linked to SW education STEM convergence education. Meanwhile, one of the tasks that must be set prior to the maker education is to take an educational approach rather than a tech-centric approach and consider ways to stimulate interest and motivation of the participants. For this purpose, this study developed and applied an engineering-oriented Reading & Maker education program to prospective teachers so that they could participate in active making activities on their own with interest and sympathy rather than simply guiding maker activities. As a result of the study, the results of the maker education recognition survey after the application of the program showed a statistically significant improvement(p<.000).
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박정호(Jungho Park),하종문(Jong Moon Ha),김윤한(Yunhan Kim),윤병동(Byeng D. Youn) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Lots of methodologies have been developed to diagnose the faults in the gear system. Especially, fault diagnostics of planetary gears is widely investigated as the gears are usually exposed to harsh operating conditions such as heavy loads or high speed. However, previous studies are limited to diagnosis of the gears under stationary conditions with constant speed and constant loading conditions. In this study, therefore, we develop a methodology to diagnose the faults in the gear under non-stationary conditions. In the methodology, we exploit the vibration signals of the planetary gear. The wavelet transform was used for the vibrations signals to observe the non-stationary behaviors of the gears in time-frequency domain. Then, Gaussian process was used to observe and quantify the degree of fault severity of the vibrations signals in the time-frequency domain. The methodology was demonstrated by using two case studies: the analytical vibrations signals from a simulation and the vibration signals actually measured from a planetary gear in a real case. In the studies, vibrations signals in normal and faulty conditions are acquired and we quantify the degree of fault severity by using the methodology. From the case studies, we could conclude that the methodology could differentiate the faulty condition from the normal one.
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