• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1994년도 추계학술대회 논문집
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• pp.176-181
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• 1994

As tools for machining precesion componants, end mills and ball end mill are widely used. For the end mill have longer cylindrical shape comparing diameter, they are liable to deflect when machining and induce geometrical error and deterioration of surface roughness. To improve the stiffness and the sharpness of the cutting edge of end mill, a software for manufaturing end mills are developed. The progeam predicts the result of helical flute grinding and the configuration of cutting edge which is located in cylindrical surface. Furthermore to facilitate the manufacturing end mill using CNC grinding machine, the setting conditions which satisfy the geometrical requirments like tool rake angle and stiffness are obtained.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.37-41
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• 2002

This study has been focused on the development of an open architecture CNC system and integration of core application technology for machine tool such as a remote monitoring/diagnosis system, NURBS interpolation, and cutting process simulation. To do this, we have developed a comprehensive CNC software including the basic HMI, screen editor, ASF, and visual builder. As a control hardware system for machine tool, the universal I/O module and CNC main unit have been developed. Then the remote monitoring/diagnosis system and NURBS interpolation have been implemented in the CNC software. The cutting simulation software will be used for enhancing the productivity of machine tools. Through a simulator and test bed, the whole technology has been verified.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제11권3호
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• pp.209-218
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• 2007

The purpose of this study is to create an interactive tool Geometry Player for geometric explorations. In designing this software, we referred to van Hiele's geometric learning theory of and Duval's cognitive comprehension theory of geometric figures. With Geometry Player, it is easy to construct and manipulate dynamic geometric figures. Teachers can easily present the dynamic process of geometric figures in class, and students can use it as a leaning tool to construct geometric concepts by themselves. It is hoped that Geometry Player can be a useful assistant for teachers and a nice partner for students. A brief introduction to Geometry Player and some application examples are included in this paper.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 춘계학술발표논문집 (상)
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• pp.457-460
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• 2002

복잡한 응용 프로그램을 빠르게 개발하고 이의 유지보수가 용이하도록 하기 위해 재사용 가능한 컴포넌트 기반의 소프트웨언 개발(CBD: Component-Based Development)개념이 확산되고 있고, 이와 관련 되어 컴포넌트 재사용성을 높이기 위한 EJB, COM, CCM 등과 같은 컴포넌트 모델과 이의 개발 및 이미 개발된 컴포넌트를 재사용하고자 하는 연구가 다양하게 진행되고 있다. 컴포넌트를 기반으로 시스템을 효과적으로 구성하기 위해서는 컴포넌트들이 서로 정확하게 결합하여 작동할 수 있는 아키텍쳐를 기반으로 컴포넌트의 조림 작업이 이루어져야 한다. 잘 정의된 아키텍쳐가 존재하면, 시스템이 상위수준에서 어떻게 구성되어 있고, 어떠한 기능을 수행하는지의 방향을 제시해 주므로 조립하는 시스템이 제공하는 서비스를 추상화하여 표현할 수 있다. 본 논문은 제 삼자에 의해 개발된 컴포넌트들의 조림을 통한 시스템 개발을 지원하기 위하여 아키텍쳐 기반의 시스템 설계 방법을 제안하고 이를 지원하는 도구인 COBALT(Component-Based Application DeveLopment Tool) 조립도구의 아키텍쳐 모델러를 소개한다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1999년도 춘계학술대회 논문집
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• pp.69-74
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• 1999

This paper aims to DNC application of car seat cushion die. DNC systems are consist of CAD(CATIA1, CAM(Z-MASTER, OMEGA) software and CNC milling machine. CAM software is purpose to G-code generation for CNC programming. Then CAM software and CNC milling machine are connect to RS-232-C cable for networking.

• 대한전기학회논문지
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• 제41권5호
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• pp.562-572
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• 1992

In this paper, we propose software algorithms which provide acceleration/deceleration characteristics essential to high dynamic performance at the transient states where industrial robots or CNC machine tools start and stop. Software acceleration/deceleration methods are derived from the mathematical analyses of typical hardware systems controlling acceleration/deceleration. These methods make servo motors, which drive axes of motion, start and stop smoothly without vibration in the repeated tools. The path error, which is one of the most significant factors in the performance evaluation of industrial robots or CNC machine tools, is analyzed for linear, exponential, and parabolic acceleration/deceleration algorithms in case of circular interpolation. The analyses show that path error consists of the distance between the required path and generated one through acceleration/deceleration, and that between the generated one through acceleration/deceleration algorithm and the actual one of the end effector of the industrial robot or tool of the CNC equipment.

• 한국정보과학회논문지:소프트웨어및응용
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• 제30권10호
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• pp.925-937
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• 2003

디지털 TV 소프트웨어의 입력은 MPEG-2(Moving Picture Experts Groups-2) 동영상 압축 기술을 이용한 전송 스트림(Transport Stream)이다. MPEG-2 TS는 복잡한 계층 구조와 내부 연관관계를 가지고 있으며, 스트림의 필드 값 결정 시 디지털 TV 소프트웨어의 시스템 규격과 관련된 다양한 제약 사항이 존재한다. 그러나, 일반적인 MPEG-2 스트림 생성 도구들은 MPEG-2 TS 자체의 명세만을 가지고 스트림을 생성하므로 디지털 TV 소프트웨어를 구성하는 모듈의 기능이나 모듈 사이의 상호 작용은 고려하지 않는다. 본 논문에서는 디지털 TV 소프트웨어의 테스트를 위해 체계적으로 테스트 스트림을 생성하는 방법을 제안한다. 또한 제안한 방법을 적용하여 생성한 테스트 스트림을 실제 디지틸 TV 수신기 시스템에 적용한 실험 결과를 제시한다 본 방법을 이용하면 기존의 스트림 생성기와 달리 디지털 TV 소프트웨어의 시스템 테스팅 뿐 아니라, 모듈 및 통합 테스팅을 위한 테스트 스트림의 생성이 가능하며 발견된 오류의 원인 분석이 가능하다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 춘계학술대회 논문집
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• pp.42-47
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• 2007

The characteristics of the tool system give many effects into the costs and qualities for the finished components. Therefore, a tool life is one of the important issues on cold forging industry. However, since variables related with tool life are many complicated, the studies for solution should be investigated by the systematic research approach. The shape and process changes of die, the hardness changes of material and the tolerance of dies to decrease the die stress are analyzed by the FEM software. The heat-treatment of tool material is investigated to improve the tool life. Deep cryogenic treatment of tool steel is very efficient to improve the wear resistance due to the fine carbide. And, it is investigated that the shape and dimension of tool give effect into both tool life and quality of forged product..

• 조명전기설비학회논문지
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• 제29권7호
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• pp.71-79
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• 2015

This paper is on the development of computer software which can be utilized as a power system analysis tool for reliability assessment education. The input data of the developed software are so simple that even a non-expert easily understand how to use it. The software provides not only reliability indices but also their distributions, moreover, it provides the factors those effect the indices, which made the software even more useful for educational purpose. The developed software utilized Monte-carlo simulation based on the state duration sampling, therefore it can manage various probability distributions such as exponential, Weibull, gamma and lognormal distribution. Within the software, the parameters of the distribution can be decided automatically from its mean and variance, that is another advantage as an educational software.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.272-279
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• 2007

Recently, train control system is adopting computer system replacing mechanical system and its software is taking more responsibility than ever. Train control system software is a safety-critical embedded software with realtime and high reliability requirements. In this paper, we propose a safety assessment method for the train control system software. We review characteristics of train control system software and analyze related international software safety standards to derive requirements for safety assessment. Testing tools used for embedded software are surveyed to find a feasible safety assessment architecture. The proposed safety assessment method is to use safety activity results generated during development processes and feed them to the runtime embedded software testing tool.