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Article

전자저널 논문

2020; 30(1): 39-66

Published online February 28, 2020 https://doi.org/10.29275/jerm.2020.02.30.1.39

Copyright © Korea Society of Education Studies in Mathematics.

University Students’ Understanding of the Process-object Layers of Derivatives at a Point Through the Lens of Representational Fluency

표현 유창성의 렌즈로 본 대학생들의 미분계수 과정-대상 구조 이해

이지현

Abstract

Representational fluency refers to the ability to easily and accurately interact with multiple representations of a concept. This study focused on a specific representation fluency about derivatives at a point: the ability to represent derivatives at a point algebraically, graphically, numerically, and verbally from the functions given by formulas, graphs, tables, and verbal descriptions. Thirty-four Korean university students participated in the representational fluency assessment consisting of 16 tasks, and their written responses were analyzed by using the qualitative content analysis method to explore their understanding of the process-object layers of derivatives at a point from their interactions with given representations of each task. The emergent students’ derivative conception categories indicate that a substantial portion of the students did not fully understand a derivative as a rate of change of a dependent variable with respect to an independent variable, and lacked understanding of the ratio, limit, and function process underlying the concept of the derivative. Students’ diverse responses to the representational fluency tasks and qualitative analysis of such tasks demonstrate what students’ interactions with the given multiple representations of derivatives involve and what possibilities multiple representations tasks have as a tool for assessing and facilitating students’ understanding of the complex concept structure of derivatives.

Keywords미분,다양한 표현,표현 유창성,과정-대상 이론,변화율,derivatives,multiple representations,representational fluency,process-object theory,a rate of change