• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
• /
• pp.1663-1665
• /
• 2005

The urban transit system is operated by driverless and automatic. In driverless and automatic system, the system function is accomplished exactly to obtain the safety and reliability of system and the system is designed to minimize risk. In order to design the system, the functional analysis is performed. Recently functional analysis is performed by design tool which is used and verified by aerospace, military, etc. Generally, the design tool is used to perform functional analysis in urban transit system development project. The design toolassist the system engineer to analysis the function of system in basic design. Therefore, in this paper, it is performed the functional analysis to satisfy the system requirement of urban transit system and to confirm the operation of system using design tool.

• 한국정밀공학회지
• /
• 제7권2호
• /
• pp.95-104
• /
• 1990

This paper descirbes some research of Computer-aided Design of multi-stage cold forging die of rotationally symmetric parts produced by the press or former. An approach to the system is based on knowledge based system. Knowledges for tool design are extracted from the plasticity theory, handbooks, relevent references and empirical know-how of experts in cold forging companies. The deveoped system is composed of three main modules such as die design module, punch design module, tool elements design module which are sued independently or in all. Using this system, design parameters (types of dies, geometric shapes and dimensions of dies, types of punches, geometric shapes and dimensions of punches, geometric shapes and dimensions of tool elements) in each operation are determined and the output is generated in graphic form. The develpoed system, aids designer, provides powerful capability for designing dies, punches and tool elements.

• Educational Technology International
• /
• 제10권2호
• /
• pp.29-61
• /
• 2009

The purpose of this study was to design an inquiry supporting tool on wiki based collaborative learning and to investigate the effect of the inquiry supporting tool. Eight design principles were selected and more specified design strategies were made from the literatures. The first system with the first-round design principles was developed and implemented in an actual classroom. After the first field study, researcher found a few drawbacks of the system. The second system was implemented in the classroom again. Finally developed wiki-based inquiry supporting tool system is unique in that it allows instructors to design their own CSCL inquiry activities, and it has intuitive menu tabs showing inquiry learning processes.

• 한국기계가공학회지
• /
• 제7권3호
• /
• pp.55-60
• /
• 2008

Until a recent date, the surface finish generated in turning by the conventional cutting tool is directly related to the feed rate and the size of the tool nose radius. With this tool a large feed rate will give poorer surface finish and a large nose radius will generate a better surface finish. Recently a new concept in the tool design is introduced to achieve a better surface finish at a higher feed rate. This is the wiper tool, which has the portion of nose with infinite radius. This can remove the ridges left when the conventional tool is used. In this study two series of cutting tests with the wiper tool and the conventional tool are carried out under the various cutting conditions of cutting depth, feed rate and cutting speed. The effects of the wiper design and the cutting conditions on the surface roughness resulted are carefully examined and compared.

• 한국공작기계학회논문집
• /
• 제17권5호
• /
• pp.70-75
• /
• 2008

This paper describes a tool-clamping/unclamping mechanism for application of a micro-spindle. The mechanism is based on one-way shape memory effect and interference-fit. The corresponding mathematical models and a few considerable design parameters are mentioned in this paper. Especially, necessary conditions for the clamping and unclamping operation are investigated through finite element analysis. The analysis results show that the differences between the diametral deformations of the tool holder in high temperature and that in low temperature are increased according to amounts of the interference. Thus the less interference between the tool-holder and the ring, the less tolerance to allow the clamping and unclamping operation because the inner diameter of the tool holder in high temperature should be smaller than the diameter of the tool shank, and that in low temperature should be larger than the diameter of the tool shank. In addition, the design for maximization of clamping force are investigated based on finite element analysis. The results show that the more amounts of the interference, the more clamping force. As the result, the interference should be considered as a important factor to maximize the tool clamping force.

• 항공우주시스템공학회지
• /
• 제12권4호
• /
• pp.90-97
• /
• 2018

고속 비행체의 연료공급 및 냉각계통의 통합설계를 위한 프로그램을 개발하고 이를 이용하여 예비설계 및 검증을 수행하였다. 개발된 설계 도구는 상용 열유체 시스템 설계 프로그램을 프레임워크로 이용하여 모듈 통합과 입출력 처리 등이 개선되었다. 모델의 형상 및 열환경 변수를 입력하여 구성품의 상태량을 계산하고 모사를 통하여 설계 요구조건 충족을 확인할 수 있다. 이 프로그램을 사용하여 시스템의 세부 구성품 규격 선정에 적절하게 사용할 수 있음을 나타내었다.

• 한국디자인학회:학술대회논문집
• /
• 한국디자인학회 2005년도 춘계 학술발표대회 논문집
• /
• pp.76-77
• /
• 2005

• 한국정밀공학회지
• /
• 제16권12호
• /
• pp.24-30
• /
• 1999

In the automobile development, press tool design and manufacturing are very difficult and need high cost experienced workers. Therefore, we concerned ourselves in the cost down and easy manufacturing. In this research, we have developed a tool for LH/RH of the front fender, which had difficulty in forming. We have carried out the drawing analysis by Pam-stamp and CATIA modeling. Finally, we get the optimal design parameter. As a result of try out, we found out the optimal width and margin at the center line for tool design. Also, in order to get good results we have to intaglio margin in the part of the wheel house and utilize double bead on every side except corner.

• 전자공학회논문지C
• /
• 제35C권7호
• /
• pp.20-29
• /
• 1998

As the packing density of ICs in recent submicron IC design increases, interconnects gain importance. Because interconnects directly affect on two major components of circuit performance, power dissipation and operating speed, circuit engineers are concerned with the optimal design of interconnects and the aid tool to design them. When circuit models of interconnects are given (including geometry and material information), the analysis process for the given structure is not an easy task, but conversely, it is much more difficult to design an interconnect structure with given circuit characteristics. This paper focuses on the latter process that has not been foucsed on much till now due to the complexity of the problem, and prsents a design aid tool(DATOIS) to synthesize interconnects. this tool stroes the circuit performance parameters for normalized interconnect geometries, and has two oeprational modes:analysis mode and synthesis mode. In the analysis mode, circuit performance parameters are obtained by searching the internal database for a given geometry and interpolates results if necessary . In thesynthesis mode, when a given circuit performance parameter satisfies a set of geometry condition in the database, those geometry structures are printed out.

• 소성∙가공
• /
• 제26권6호
• /
• pp.372-377
• /
• 2017

In this paper, an effective design procedure was proposed to design the rib of die structure for auto-body member with ultra-high strength steel (UHSS) having ultimate tensile strength (UTS) of 1.5 GPa. From analysis results of the die structure, structural safety of the die was evaluated with information such as displacement and von-Mises stress. It was concluded that the casting part could be designed in order to reduce tool deformation. A design guideline of the die structure was proposed, especially for the rib structure in the casting part with an optimization scheme and local reinforcement concept. Simulation result following the design guideline fully explained that stability of the tool structure could be obtained simultaneously with weight minimization.