매개변수개념의 의미충실한 사용에 관한 사례연구 -중학교 3학년 한 교실을 대상으로- = Case Study on Meaningful use of Parameter - One Classroom of Third Grade in Middle School -

다국어 초록 (Multilingual Abstract)

Algebraic generalization of patterns is based on the capability of grasping a structure inherent in several objects with awareness that this structure applies to general cases and ability to use it to provide an algebraic expression. The purpose of this study is to investigate how students generalize patterns using an algebraic object such as parameters and what are difficulties in geometric-arithmetic pattern tasks related to algebraic generalization and to determine whether the students can use parameters meaningfully through pattern generalization tasks that this researcher designed. During performing tasks of pattern generalization we designed, students differentiated parameters from letter ‘n’ that is used to denote a variable. Also, the students understood the relations between numbers used in several linear equations and algebraically expressed the generalized relation using a letter that was functions as a parameter. Some difficulties have been identified such that the students could not distinguish parameters from variables and could not transfer from arithmetical procedure to algebra in this process. While trying to resolve these difficulties, generic examples helped the students to meaningfully use parameters in pattern generalization.

국문 초록 (Abstract)

패턴을 대수적으로 일반화한다는 것은 몇 가지의 특정한 요소에 내재한 구조를 인식할 수 있고, 그 구조를 모든 경우로 일반화해 나갈 수 있으며, 일반적인 것을 대수적으로 표현하기 위해 인식된 그 국소적인 구조를 사용할 수 있는 것이다. 본 연구에서는 학생들이 기하-산술적 패턴과제로부터 매개변수를 어떻게 대수적으로 일반화하는지와 그 과정에서 일어나는 어려움은 무엇인지를 확인하는 것에 목표를 둔다. 더불어, 본 연구진이 개발한 패턴 일반화 과제를 통해 학생들이 매개변수개념에 대해 의미 충실한 사용으로 나아갈 수 있는지를 확인한다. 연구 결과 학생들은 변수로 작용하는 문자 과 구별되는 역할로 작용하는 매개변수의 의미를 인식하여, 이로부터 문자 과 다른 문자를 설정했다. 또한, 몇 가지의 일차함수로부터 독립변수를 나타내는 문자 과 독립적인 수 사이의 관계를 인식하였고 이를 나머지 다른 모든 경우로 일반화하여 매개변수로 설정한 문자를 이용하여 대수적으로 표현하였다. 이 과정에서 학생들에게 매개변수와 다른 변수사이에 구별의 어려움과 산술적인 절차를 대수로 이행하는 어려움이 확인되었다. 이러한 어려움을 교수자와 함께 극복해 나가는 과정에서 전형적인 예는 매개변수 개념에 대한 학생들의 의미 충실한 사용을 견인하는 역할을 제공하였다.

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