• The Journal of Korean Institute for Practical Engineering Education
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• v.4 no.1
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• pp.72-79
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• 2012

Recently, the growth of the computer-related industries lead to the growth of the computer-aided education. Virtual training (VT) is one of the most interesting education methods. Many 3D models for the VT contents have been produced, but little research has been performed for the unified management system to promote the reuse of 3D models. This paper proposes the unified 3D model management system. The 3D model file formats are surveyed to find a format that can be easily used by many VT content production softwares. The 3D model files will be stored in a central DB server. The structure of the DB system will be designed for 3D models. The system provides an easy way to search and download a 3D model. With the proposed system, the reuse of 3D models is expected to be promoted.

• International Journal of Precision Engineering and Manufacturing
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• v.2 no.3
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• pp.27-33
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• 2001

The aim of the present work is to propose a model for Computer Aided programming of numerical Control lathe. This model is based on the concept by features. It has been developed in an Artificial Intelligence environment, that offers a rapidity as well as a precision for NC code elaboration. In this study a pre-processor has been elaborated to study the geometry of turning workpiece. This pre-processor is a hybrid system which combine a module of design by features and a module of features recognition for a piece provided from an other CAD software. Then, we have conceived a processor that is the heart of the CAD/CAM software. The main functions are to study the fixture of the workpiece, to choose automatically manufacturing cycles, to choose automatically cutting tools (the most relevant), to simulate tool path of manufacturing and calculate cutting conditions, end to elaborate a typical manufacturing process. Finally, the system generates the NC program from information delivered by the processor.

• Bulletin of the Korean Mathematical Society
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• v.48 no.3
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• pp.585-600
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• 2011

In this paper we derive an integral formula on an (n + 3)-dimensional, compact, minimal contact three CR-submanifold M of (p-1) contact three CR-dimension immersed in a unit (4m+3)-sphere $S^{4m+3}$. Using this integral formula, we give a sufficient condition concerning the scalar curvature of M in order that such a submanifold M is to be a generalized Clifford torus.

• Proceedings of the Korea Multimedia Society Conference
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• 2012.05a
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• pp.414-416
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• 2012

정보통신 기술의 발달은 학습 환경에도 많은 변화를 가져왔다. U-learning을 비롯해 많은 학습 방법들이 과거의 제한된 장소에서의 학습이 아닌 언제 어디서든 자유롭게 학습할 수 있는 환경을 제공하고 있다. 본 연구에서는 QR-Code와 U-learning을 이용해 학습자들이 시공간의 제약 없이 학습 할 수 있는 환경을 학습의 장인 학교에 접목시켜 스마트 러닝이 가능하도록 하였다. 학습자들의 흥미를 이끌어내어 원하는 장소에서 원하는 시간에 언제든지 학습이 가능하도록 하여 학습 능력 향상을 기대하고 나아가 자기 주도적 학습에 도움이 될 것으로 기대된다.

• Proceedings of the KIEE Conference
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• 1999.07c
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• pp.1170-1172
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• 1999

HALS(Hypermidia Aided Learning System) is very useful computer networking educational system in high information society, and was developed by Kyungwon University. This system has three characteristics; 1) face-to-face learning, 2) ultra-high-speed information networking, 3) web-based hypermedia courseware. So, the purpose of this paper is to introduce the application to university educational program(electrical engineering: electric power system, control system). For this purpose it is described the definition and characteristics of HALS. Next, it is represented the model of electrical engineering educational program applied to HALS and the developed courseware.

• Journal of Educational Research in Mathematics
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• v.9 no.1
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• pp.111-119
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• 1999

This paper discusses jLogic, a mathematical logic education software developed by the author. jLogic is basically a MS-Windows based software that can construct first-order models, formulas and thet their satisfiablity. Logical formulas are easily input by a "keyboard" maintained by jLogic. A special finite model, called the "Toy World" can be visually cinstructed and modified. The user is supposed to answer the following 3 questions about the selected logical expression: 1. Is it a grammatically correct logical formula? 2. Is it a sentence that has a definite truth value? 3. Is th sentence true or false? When the user inputs his answer in the "Inspector window" and then presses the OK button, jLogic instantly tests the validity of the answer and tells the user the result. jLogic is freely downloaded from http://gauss.kyungpook.ac.kr/~jlogic/

• Journal of the Korean Society of Safety
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• v.17 no.4
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• pp.1-4
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• 2002

A automatic production system was developed for high productivity and safety. The semi-progressive die was unfavorable for more productivity, safety, material extravagance and incongruent high-speed production. Developed progressive die is suitable for the high production and guarantee triple production by acceptance of three array type for automobile adjust plate. We adopt Pro-$Engineer{\circledr}$ for three dimensional computer aided design suitable for the disassembly and assembly evaluation. The conclusion of this study is as follow. First, press die parts solid modeling system is built by using Pro-$Engineer{\circledr}$ through this research and verified allowable tolerance and possibility of assembly and disassembly of parts. Therefore we can reduce die manufacturing time and cost. Second, We produce 1000 units pet hot coil 1ton by traditional method, but we can acomplish material saving effect about 12% as 120 units in case of new progressive die. Fourth, we acomplished manufacturing cost curtailment effect more than 20% in comparison with traditional method.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10b
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• pp.565-567
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• 2000

최근에 들어 교육현장에서 수준별 교육의 중요성이 대두되고 있다. 그러나 적은 수의 교사로 많은 수의 학습자를 수준별로 교육하는 것은 쉽지 않은 일이다. 조별 이동이나 급간 이동으로 수준을 나누어 교육하고 있으나 변화하는 학습자의 정확한 수준 측정 및 이동이 어렵다. 또한 CAI(Computer Aided Instruction) 프로그램이 많이 보급되었지만 수업 외 시간에 학습자 스스로 반복 훈련을 통한 학습을 강조하므로 교실 수업에 적용하기는 어렵다. 따라서 본 논문에서는 이러한 문제점을 해결하기 위하여 수업시간 교사의 지도하에 웹을 기반으로한 교수-학습을 통해 각 학생들의 수준을 평가한 후 수준에 맞는 학습과 보충 및 심화학습이 이루어질 수 있는 웹기반 수준별 교수-학습 시스템을 설계하고 구현하였다.

• The Journal of Korean Association of Computer Education
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• v.11 no.6
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• pp.11-27
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• 2008

Though web-based learning is known to be effective for computer aided practical class, it lacks in cooperative human feedback and self-adjustment. This paper presented the effects of blended learning that was based on web-based learning for learning by level and blended with peer tutoring for reducing the differentials of scholastic achievements between the students. For experimental purpose, high school students were divided into two groups and web-based EXCEL tutoring tool was developed and applied to both groups in advance. After this learning, we applied the web-based learning for comparative group as before and peer tutoring for experimental group respectively, Performance result evaluated by SPSS showed that the Blended Learning has affirmative effect in scholastic achievements. Especially, students under the medium level of experimental group could narrow the gap to the high level students in its group and this eventually improved the overall achievements of experimental group with blended learning.

• Journal of Engineering Education Research
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• v.16 no.1
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• pp.54-63
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• 2013

This study aims to investigate relationships among self-directed learning readiness [SDLR], prerequisite mathematics test score and achievement level in college mathematics. For this purpose, the adjusted SDLRS (self-directed learning readiness scale) of Guglielmino's model, the score of mathematics diagnostic assesment and first semester college mathematics score among 424 freshmen students of engineering department of D university in 2011 were used and analyzed. Research results are as follows: Firstly, freshmen of engineering department had average level of SDLR, though they showed relative low level of self-direction, passion and time control ability. Secondly, considering SDLR with the mathematics diagnostic assesment score (3 groups: high, middle, low), there were no statistically significant differences. Thirdly, concerning SDLR according to the achievement level in college mathematics, a group which acquired good achievement showed higher level of SDLR compared with middle or lowachievement group. Differences among three groups were statistically significant. Lastly, there were affirmative relationships between SDLR, mathematics diagnostic assesment score and achievement in college mathematics. Furthermore, mathematics diagnostic assesment score and achievement level in college mathematics were found to be the most closely related. Based on the results, we suggest strategies to elevate SDLR of engineering department students and improve their achievement in college mathematics.