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Parent Perceptions of Enrichment Program Course Offerings: What about Non-STEM Courses?
Hyeseong Lee(이혜성),Ophelie Desmet 한국영재학회 2020 영재교육연구 Vol.30 No.3
The purpose of this study was to explore parents’ perceptions of enrichment programs, understand their decision-making process for the course selection, as well as their thoughts of an imbalance in enrichment course offerings in favor of STEM courses. An explanatory mixed methods study, using data from an online survey (n=135) and interviews (n=15), indicated that parents tend to perceive STEM is more important than non-STEM courses. Results showed that the decision of parents’ course selection for their child is influenced by a societal climate that focuses on the importance of STEM, future financial incentives and job opportunities, the rigor of STEM, and a lack of school activities that focus on STEM. Furthermore, parents take their child’s needs and interests into account as the main factors in choosing which courses to sign up.
Lee, Jongsuh,Wang, Semyung,Pluymers, Bert,Desmet, Wim,Kindt, Peter American Institute of Physics 2015 Review of scientific instruments Vol.86 No.2
<P>Generally, the dynamic characteristics (natural frequency, damping, and mode shape) of a structure can be estimated by experimental modal analysis. Among these dynamic characteristics, mode shape requires multiple measurements of the structure at different positions, which increases the experimental cost and time. Recently, the Hilbert-Huang transform (HHT) method has been introduced to extract mode-shape information from a continuous measurement, which requires vibration measurements from one position to another position continuously with a non-contact sensor. In this research study, an effort has been made to estimate the mode shapes of a rolling tire with a single measurement instead of using the conventional experimental setup (i.e., measurement of the vibration of a rolling tire at multiple positions similar to the case of a non-rotating structure), which is used to estimate the dynamic behavior of a rolling tire. For this purpose, HHT, which was used in the continuous measurement of a non-rotating structure in previous research studies, has been used for the case of a rotating system in this study. Ambiguous mode combinations can occur in this rotating system, and therefore, a method to overcome this ambiguity is proposed in this study. In addition, the specific phenomenon for a rotating system is introduced, and the effect of this phenomenon with regard to the obtained results through HHT is investigated.</P>