• Title/Summary/Keyword: 직각뿔

Search Result 3, Processing Time 0.024 seconds

Problems and Improvements of Teaching the concept of Pyramid in Elementary Mathematics Textbook (초등학교 수학교과서 '각뿔' 지도 방식에 대한 분석과 개선 방안)

  • Lee, Dong Hwan
    • School Mathematics
    • /
    • v.15 no.1
    • /
    • pp.1-14
    • /
    • 2013
  • The purpose of this study is to examine the way of teaching the concept of pyramid in the elementary mathematics textbook and try to improve the problem. Although textbook present the general definition of pyramid as including regular pyramid, right pyramid, oblique pyramid, the textbook intentionally deal with right pyramid or regular pyramid. This intention reflect the intuition or familiarity of students. But, according to the analysis, this intention do not realized. The example of pyramid presented in the textbook do not coincide with mathematical definition and intuition of students. If we intend to deal with right pyramid in the textbook, we should treat of regular pyramid and right pyramid whose base is a rectangular in the textbook.

  • PDF

Silicon Piezoresistive Acceleration Sensor with Compensated Square Pillar Type of Mass (사각뿔 형태의 Mass 보상된 실리콘 압저항형 가속도 센서)

  • Sohn, Byoung-Bok;Lee, Jae-Gon;Choi, Sie-Young
    • Journal of Sensor Science and Technology
    • /
    • v.3 no.1
    • /
    • pp.19-25
    • /
    • 1994
  • When etching rectangular convex corners of silicon using anisotropic etchants such as KOH, deformation of the edges always occurs due to undercutting. Therefore, it is necessary to correct the mass pattern for compensation. Experiments for the compensation method to prevent this phenomenon were carried out. In the result, the compensation pattern of a regular square is suitable for acceleration sensors considering space. With this consequence, silicon piezoresistive acceleration sensor with compensated square pillar type of mass has been fabricated using SDB wafer.

  • PDF

A contemplation on the extension of the pyramid in the elementary mathematics textbooks published according to the 2009 revised curriculum (2009 개정 교육과정에 따른 초등학교 수학 교과서에서 제시하고 있는 각뿔의 외연에 대한 고찰)

  • Park, Kyo Sik
    • Journal of the Korean School Mathematics Society
    • /
    • v.20 no.1
    • /
    • pp.43-56
    • /
    • 2017
  • In this thesis, the extension of the pyramid is contemplated through the pyramids presented in textbook $\ll$Math 6-1${\gg}$ published according to the 2009 revised curriculum. In textbook $\ll$Math 6-1${\gg}$, the pyramid is defined by presenting rough sketches of typical pyramids in an extensional definition method. This contrasts with the method of defining the pyramid by using such an extensional definition and a connotative definition method that reveals common properties of all pyramids. In textbook $\ll$Math 6-1${\gg}$, right pyramids whose base can not be regarded as regular polygons, and oblique pyramids are hardly presented. Nonetheless, $\ll$Math 6-1 Teacher's Guide Book${\gg}$ says that we have no choice but to handle oblique pyramids. In this thesis, based on these results, the following implications are presented as conclusions. First, there should be enough discussion on the extension of the pyramid in elementary school mathematics, and agreement to the results. In particular, such discussions are highly necessary in revising the curriculum. Second, in the process of realizing the intention of the curriculum in the textbook through the teacher's guidebook, the extension of the pyramid must be consistent. Third, there should be some consensus about the knowledge that elementary teachers should know about the pyramid.

  • PDF