• 대한수학교육학회지:수학교육학연구
• /
• 제26권3호
• /
• pp.421-442
• /
• 2016

이 연구는 현직 교사 38명이 삼각형의 무게중심 수업을 관찰한 결과를 검토하여 교사들의 수업 분석 관점의 특징을 기술함으로써 수업 실행 지식과 관련된 논의에의 시사점을 얻고자 하였다. 이를 위해 교사들이 작성한 수업 관찰 결과를 교사 지식의 분석틀인 KQ에 비추어 해석하였으며, 삼각형의 무게중심 교수-학습에 대해 선행 연구에서 지적한 주요 이슈와 관련하여 분석하였다. 이로부터 무게중심 수업 분석에서 드러나는 교사 지식의 특징을 6가지로 요약하였으며, 교사들의 수업 실행 역량 개발과 관련된 몇 가지 시사점을 논의하였다.

• 한국학교수학회논문집
• /
• 제22권2호
• /
• pp.95-113
• /
• 2019

본 연구에서는 2015 개정 수학과 교육과정에 따른 고등학교 1학년 <수학>교과서에 제시된 교과 역량을 함양하기 위한 과제의 인지적 요구 수준을 분석하였다. 9종의 <수학>교과서는 4999개의 수학 과제를 포함하였고 그 중 수학 교과 역량을 함양하기 위한 과제는 703개였다. Stein, Smith, Henningsen, & Silver(2000)의 분석틀을 바탕으로 703개의 교과 역량 함양 과제를 분석한 결과, 학생들의 높은 인지적 수준을 요구하는 과제 비율은 61.5%, 학생들의 낮은 인지적 수준을 요구하는 과제 비율은 38.5%였고 그에 따른 과제유형의 비율은 Low-M 1.0%, Low-P 37.5%, High-P 57.8%, High-D 3.7%로 나타나 수학 교과 역량을 함양하기 위한 과제의 대부분이 절차적 과정을 따라 수학적 개념, 원리, 과정 등을 이해하도록 유도하는 과제임을 알 수 있었다.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제58권2호
• /
• pp.187-223
• /
• 2019

이 연구의 목적은 우리나라 수학과 교육과정이 나아가야할 변화의 방향을 제안하는 것이다. 이를 위하여 우리나라의 2009, 2015 개정 수학과 교육과정과 일본의 2008, 2017 수학과 교육과정을 대상으로 초, 중, 고등학교급 전반에 걸쳐 직전 교육과정과의 변화를 살피고, 그 변화를 양국 간 비교하였다. 비교결과를 토대로 세 가지의 시사점을 제안하였다.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제60권4호
• /
• pp.431-449
• /
• 2021

본 연구는 초등학교 교과서가 반영하고 있는 문제해결 양상을 수와 연산 단원들을 중심으로 살펴보았다. 문제해결의 하위요소를 중심으로 수학적 활동에 대해 코딩을 실시한 결과 실행이 강조되는 가운데 학년별로 강조되는 하위 요소들이 다르게 나타났고, 잠재집단분석을 통해서 과제의 유형을 분류해 보았다. 향후 교과서 개발과 교사지원에 대한 시사점을 제공하고자 한다.

• 한국학교수학회논문집
• /
• 제15권1호
• /
• pp.1-25
• /
• 2012

본 연구는 Freudental의 수학관에 근거한 RME가 표방하는 현실 속 풍부한 맥락적 상황들로 이루어진 관점으로 초등학교 4학년 교과서를 중심으로 한국 및 미국(3종) 교과서에서 제시된 문제의 맥락성을 살펴보았다. 이를 위해 맥락성의 요소를 일상성, 다양성, 수학적 잠재성으로 도출하여 맥락문제를 분류하여 분류된 문제를 비교 분석하였다. 그 결과 한국 교과서는 미국 교과서에 비해, 맥락문제가 차지하는 비율 뿐 아니라, 과정별 맥락성이 모두 낮게 나타났다. 또한 각 요소별 성향을 잘 나타내고 있는 문항을 분석, 기술함으로써 추후 교과서 개발 뿐 아니라, 문항 개발에 의미 있는 자료를 제공할 것으로 기대한다.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제57권2호
• /
• pp.111-136
• /
• 2018

This study suggests a framework for analyzing items based on the characteristics, and shows the relationship among the characteristics, difficulty, percentage of correct answers, academic achievement and the actual mathematical problem solving competency. Three mathematics educators' classification of 30 items of Mathematics 'Ga' type, on 2017 College Scholastic Ability Test, and the responses given by 148 high school students on the survey examining mathematical problem solving competency were statistically analyzed. The results show that there are only few items satisfying the characteristics for mathematical problem solving competency, and students feel ill-defined and non-routine items difficult, but in actual percentage of correct answers, routineness alone has an effect. For the items satisfying the characteristics, low-achieving group has difficulty in understanding problem, and low and intermediate-achieving group have difficulty in mathematical modelling. The findings can suggest criteria for mathematics teachers to use when developing mathematics questions evaluating problem solving competency.

• Communications for Statistical Applications and Methods
• /
• 제25권5호
• /
• pp.471-488
• /
• 2018

In this paper, we propose extending proportional hazards frailty models to allow a discrete distribution for the frailty variable. Having zero frailty can be interpreted as being immune or cured. Thus, we develop a new survival model induced by discrete frailty with zero-inflated power series distribution, which can account for overdispersion. This proposal also allows for a realistic description of non-risk individuals, since individuals cured due to intrinsic factors (immunes) are modeled by a deterministic fraction of zero-risk while those cured due to an intervention are modeled by a random fraction. We put the proposed model in a Bayesian framework and use a Markov chain Monte Carlo algorithm for the computation of posterior distribution. A simulation study is conducted to assess the proposed model and the computation algorithm. We also discuss model selection based on pseudo-Bayes factors as well as developing case influence diagnostics for the joint posterior distribution through ${\psi}-divergence$ measures. The motivating cutaneous melanoma data is analyzed for illustration purposes.

• 한국수학교육학회지시리즈D:수학교육연구
• /
• 제25권3호
• /
• pp.201-225
• /
• 2022

This paper details case study vignettes that focus on enhancing the teaching and learning of geometry and measurement in the elementary grades with attention to pedagogical practices for teaching through problem solving with rigor and centering equitable teaching practices. Rigor is a matter of equity and opportunity (Dana Center, 2019). Rigor matters for each and every student and yet research indicates historically disadvantaged and underserved groups have more of an opportunity gap when it comes to rigorous mathematics instruction (NCTM, 2020). Along with providing a conceptual framework that focuses on the importance of equitable instruction, our study unpacks ways teachers can leverage their deep understanding of geometry and measurement learning trajectories to amplify the mathematics through rigorous problems using multiple approaches including learning by doing, challenged-based and mathematical modeling instruction. Through these vignettes, we provide examples of tasks taught through rigorous problem solving approaches that support conceptual teaching and learning of geometry and measurement. Specifically, each of the three vignettes presented includes a task that was implemented in an elementary classroom and a vertically articulated task that engaged teachers in a professional learning workshop. By beginning with elementary tasks to more sophisticated concepts in higher grades, we demonstrate how vertically articulating a deeper understanding of the learning trajectory in geometric thinking can add to the rigor of the mathematics.

• Computers and Concrete
• /
• 제32권4호
• /
• pp.399-410
• /
• 2023

This study proposes a novel use of backpropagated Levenberg-Marquardt neural networks based on computational intelligence heuristics to comprehend the examination of hybrid nanoparticles on the flow of dusty liquid via stretched cylinder. A two-phase model is employed in the present work to describe the fluid flow. The use of desulphated nanoparticles of silver and molybdenum suspended in water as base fluid. The mathematical model represented in terms of partial differential equations, Implementing similarity transformationsis model is converted to ordinary differential equations for the analysis . By adjusting the particle mass concentration and curvature parameter, a unique technique is utilized to generate a dataset for the proposed Levenberg-Marquardt neural networks in various nanoparticle circumstances on the flow of dusty liquid via stretched cylinder. The intelligent solver Levenberg-Marquardt neural networks is trained, tested and verified to identify the nanoparticles on the flow of dusty liquid solution for various situations. The Levenberg-Marquardt neural networks approach is applied for the solution of the hybrid nanoparticles on the flow of dusty liquid via stretched cylinder model. It is validated by comparison with the standard solution, regression analysis, histograms, and absolute error analysis. Strong agreement between proposed results and reference solutions as well as accuracy provide an evidence of the framework's validity.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제56권2호
• /
• pp.131-145
• /
• 2017

The representation of irrational numbers has a key role in the learning of irrational numbers. However, transparent and finite representation of irrational numbers does not exist in school mathematics context. Therefore, many students have difficulties in understanding irrational numbers as an 'Object'. For this reason, this research explored how mathematics textbooks affected to students' understanding of irrational numbers in the view of process and object. Specifically we analyzed eight textbooks based on current curriculum and used framework based on previous research. In order to supplement the result derived from textbook analysis, we conducted questionnaires on 42 middle school students. The questions in the questionnaires were related to the representation and calculation of irrational numbers. As a result of this study, we found that mathematics textbooks develop contents in order of process-object, and using 'non repeating decimal', 'numbers cannot be represented as a quotient', 'numbers with the radical sign', 'number line' representation for irrational numbers. Students usually used a representation of non-repeating decimal, although, they used a representation of numbers with the radical sign when they operate irrational numbers. Consequently, we found that mathematics textbooks affect students to understand irrational numbers as a non-repeating irrational numbers, but mathematics textbooks have a limitation to conduce understanding of irrational numbers as an object.