• Journal of the Korean Institute of Telematics and Electronics
• /
• v.26 no.1
• /
• pp.10-19
• /
• 1989

This paper proposes the object modeling algorithm using depth data. In order to extract the shape of the object, surface is classified by the magnitude and the direction of Z gradient within the 2x2 mask from input depth data. For the object combined with several primitives is separated by kernel points. Further, spatial relationship between surface regions is extracted for the recognition. Finally, the effectiveness of this algorithm is demonstrated by several experiments.

• School Mathematics
• /
• v.9 no.2
• /
• pp.197-222
• /
• 2007

The study aims to reflect the elementary school geometry education based on the Realistic Mathematics Education in the Netherlands in the light of the results from recent researches in geometry education and the direction of geometry standards for school mathematics of the National Council of Teachers of Mathematics in order to induce implications for improving korean geometry curriculum and textbook series. In order to attain these purposes, the present paper reflects the history of elementary school geometry education in the Netherlands, sketches the elementary school geometry education based on the Realistic Mathematics Education in the Netherlands by reflecting general goals of the mathematics education, the core goals for geometry strand of the Netherlands, and geometry and spatial orientation strand of Dutch Pluspunt textbook series for the elementary school more concretely. Under these reflections on the documents, it is analyzed what is the characteristics of geometry strand in the Netherlands as follows: emphasis on realistic spatial phenomenon, intuitive and informal approach, progressive approach from intuitive activity to spatial reasoning, intertwinement of mathematics strands and other disciplines, emphasis on interaction of the students, cyclical repetition of experiencing phase, explaining phases, and connecting phase. Finally, discussing points for improving our elementary school geometry curriculum and textbook series development are described as follows: introducing spatial orientation and emphasizing spatial visualization and spatial reasoning with respect to the instruction contents, considering balancing between approach stressing on grasping space and approach stressing on logical structure of geometry, intuitive approach, and integrating mathematics strands and other disciplines with respect to the instruction method.

• Communications of Mathematical Education
• /
• v.18 no.2 s.19
• /
• pp.487-490
• /
• 2004

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
• /
• 1998.11a
• /
• pp.95-104
• /
• 1998

• The Journal of the Korea Contents Association
• /
• v.8 no.7
• /
• pp.103-111
• /
• 2008

There have been a few mathematic education programs that based on operating activity considering cognitive development level of elementary student, although we can find a variety of computer-aided mathematic teaching methods for elementary school. The purpose of this paper was to examine the effect of mathematical program based on operating activity developed as teaching materials in plain figures. As results of the post-achievement test and attitude test, it was found that the math program has been improved the achievement positively. By a result that inspects mathematical learning attitude of the experiment group, it was found that variable factors such as interest, confidence, self-learning were changed significantly more important in statistics.

• Journal of Digital Contents Society
• /
• v.19 no.1
• /
• pp.199-204
• /
• 2018

In this paper, we propose a fast collision detection method for interacting with objects in virtual space. First, in the mesh grouping step, the entire space is divided into small spaces of a predetermined size, and the positions and sizes of the smallest basic stereoscopic shapes (cube or sphere) including all of the meshes belonging to each small space are determined. In the collision detection step, it is checked whether a haptic interface point (HIP) is included in a three-dimensional figure representing a group. When a collision with a specific three-dimensional figure is confirmed, searching is performed only for the meshes in the group to find a mesh on which a possible real collision with HIP occurred. The effectiveness of the proposed algorithm is verified by measuring and comparing the computation time of the proposed method with and without the proposed method.

• 한국공간정보시스템학회:학술대회논문집
• /
• 2005.05a
• /
• pp.221-224
• /
• 2005

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
• /
• 2008.10a
• /
• pp.333-334
• /
• 2008

본 연구에서는 GIS 기반의 환지설계방식을 도입하여 환지업무에 사용되는 도형과 속성자료를 GIS데이터로 구축하고 공간데이터 결합 및 속성을 연계(Link)하여 환지설계업무를 수행하였다.

• 한국정보교육학회:학술대회논문집
• /
• 2006.01a
• /
• pp.289-294
• /
• 2006

지금 세계는 지식 정보화의 물결에 휩싸여 있다. 인터넷의 급속한 보급으로 인하여 사람들은 자신들이 원하는 정보를 쉽게 구할 수 있게 되었으며 이러한 정보를 누가 생산하고 분배하느냐에 따라서 국가경제에 미치는 영향도 점점 커지고 있다. 이러한 사회적인 흐름은 교육에도 영향을 미치게 되었다. 서로의 정보 공유가 용이하고 시 공간의 구애를 받지 않으며 한 번에 많은 사람들이 동시에 접속할 수 있는 웹의 특성상 교육에 미치는 영향도 많을 것이다. 특히 초등학교에서 수학 교육은 교구를 이용하거나 원리를 이해하는 면에서 교과서만을 가지고는 많은 어려움이 따른다. 특히 도형 단원에서는 아동들이 직접 도형을 가지고 조작할 수 있는 환경이 중요한 데 이를 웹이 어느 정도 보안할 수 있는 것이다. 이에 본문에서는 초등학교 수학과 도형단원의 학습 자료를 개발하여 아동들의 학업성취도를 향상시킬 수 있는 프로그램을 설계하였다.

• Spatial Information Research
• /
• v.1 no.1
• /
• pp.55-61
• /
• 1993

The need for unified graphic base with high accuracy for nation¬wide is emerging since many facility management organizations and local governments have been taking steps for introducing facility management systems from the late of 1980's. A major finding of the above efforts was the importance of establishment of National Land Information System supporting all land management and use, administration purpose and effective decision-making. So to meet the recent need and to prepare future information society, a study is going on progress for in t roduc i ng Parce I-Based Land In forma t ion Sys tern based on I arge-sca I e cadastral graphic data and parcel information, capable to link with admini¬stration, communication, statistics etc.