Min Kyeong Kim , Jerold Mathews

DOI: Vol.4(No.2) 57-62, 2000

We motivate the curl of the velocity field of a fluid in three ways: from a calculation of the velocity of a rotating fluid relative to a coordinate system rotating with the fluid and from two calculations of a vector form of circulation on small circles or spheres suspended in a moving fluid.

Sang Sook Choi Koh

DOI: Vol.4(No.2) 63-77, 2000

The purpose of this article is to devise the activities based on van Hiele levels of geometric thought using computer software, Geometer`s Sketchpad (GSP) as a tool. The most challenging task facing teachers of geometry is the development of student facility for understanding geometric concepts and properties. The National Council of Teachers of Mathematics (Curriculum and Evaluation Standards for School Mathematics, 1991; Principles and Standards for School Mathematics, 2000) and the National Research Council (Hill, Griffiths, Bucy, et al., Everybody Counts, 1989) have supported the development of exploring and conjecturing ability for helping students to have mathematical power. The examples of the activities built in GSP for students are designed to illustrate the ways in which van Hiele`s model can be implemented into classroom practice.

Hyun Yong Shin , In Ki Han

DOI: Vol.4(No.2) 79-93, 2000

The purpose of this article is to introduce the gifted education of mathematics in Korea. We first discuss what is going on in Korea for mathematics education for gifted students. The curriculums for the institutes for gifted education are mentioned. Some focus of this article is on proposing some teaching materials that are actively utilizing many basic concepts of cryptography and super-string theory, along with careful use of calculators and computers. Many of the materials have been designed with problem-posing approach or through invoking the cognitive conflict.