• 한국CDE학회논문집
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• 제3권4호
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• pp.236-242
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• 1998

This paper presents a development of computer aided cutting tool selection techniques for rough and finish turning operations. The developed system,. which is one of important activities for computer aided operation planning, firstly implements operation sequencing. Then, from relations of the size of machined area, recommended finishing allowance and maximum depth of cut, a main machining method is selected, a number of cut is calculated, cutting tools including toolholders and inserts are selected, and values for cutting parameters are determined. A cutting tool selection procedure is proposed for toolholders and inserts of ISO code in rough cutting, and some important parameters such as holder style, tool approach angle, tool function and its direction are described in detail. In order to demonstrate the validity of the system a case study is performed.

• 한국도서관정보학회지
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• 제37권2호
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• pp.47-72
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• 2006

권장도서목록은 ‘좋은 책’을 안내하여 책의 선택을 돕는 역할을 한다. 현재 다양한 기관에서 발행되는 권장도서 목록은 도서관 및 교육현장에서 어린이 및 청소년용 독서자료 선택을 위한 선정도구로 많이 활용되고 있다. 이러한 현실을 고려해서 이 연구에서는 어린이 및 청소년도서용 권장도서목록의 생산현황을 살펴보고, 이들 전장도서목록이 선정도구로 적합한지를 평가하였다. 이후 권장도서목록이 선정도구로 기능하기 위해서, 어떻게 개발되는 것이 좋은지 그 개발방안을 제안하였다.

• 대한기계학회논문집
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• 제17권9호
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• pp.2264-2270
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• 1993

This paper describes the development of a tool management system of milling operations in CIM environment. The system consists of modules for tool room management, tool purchasing, tool magazine management and tool selection. The tool selection is interactively performed by the aid of the graphic icons of milling cutter. The so-called UNICODE tool coding system is also developed to unify different kinds of codes from different tool manufacturers. The system runs on IBM PC AT.

• 한국정보처리학회논문지
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• 제4권10호
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• pp.2533-2543
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• 1997

컴퓨터 네트워크 장비의 객관적 선정을 위해서는 통신 서비스 품질(Quality of Service : QoS) 개념의 이해와 적용이 요구된다. ITU-T E.800 권고안은 공급자와 고객관점의 서비스 품질 및 만족도 평가 기준을 제시하고 있기 때문에 네트워크 제품 평가 및 선정에 이용될 수 있다. 본 연구에서는 QoS를 고려한 LAN 스위치 평가모형과 선정을 위한 소프트웨어 도구를 개발하였다. 이를 위한 구체적 평가방법으로 효과적인 집단 의사결정을 위한 다기준 평가 모형에서 유용하게 이용되는 Saaty의 계층적 분석방법(Analytic Hierarchy Process : AHP)을 적용하였다. 선정 평가를 위한 자료는 네트워크 전문가들에 대한 설문조사와 현장 조사 방법으로 수집하였다. 그리고 제안된 LAN 스위치 평가 모형에 따라 선정 도구를 구현하고 적용 결과를 분석하였다. 본 연구 결과는 LAN 스위치 선정을 위한 의사결정시 유용한 도구로 활용될 수 있을 것으로 기대되며, 아울러 컴퓨터 네트워크와 관련된 QoS 기반의 평가 및 선정을 위한 의사결정에 적용될 수 있을 것이다.

• 기술혁신연구
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• 제31권3호
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• pp.171-199
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• 2023

본 연구는 K연구원의 상향식 R&D과제기획 차원의 신규 연구기획과제 선정평가를 위한 평가도구 개발에 목적을 두고 진행하였다. 이를 위해 CIPP모형과 연구기획평가를 위한 선정평가 및 평가지표에 관한 선행연구를 중심으로 R&D과제기획 선정평가 항목과 문항을 개발 한 후, 2회에 걸친 델파이 조사를 실시하였다. 개발된 평가도구는 13명의 전문가를 대상으로 설문조사를 실시하여 내용타당도, 합의도 및 수렴도를 검증하였다. 최종 선정된 R&D과제기획 선정평가 도구는 8개 항목에 총 21개 문항으로, 상황평가 5 문항, 투입평가 2문항, 과정평가 8문항, 산출평가 6문항으로 구성되었다. 개발된 평가 도구는 상향식 기획 과정상의 문제점을 해소하고 연구자들의 기획역량을 제고하는 데 기여할 것이다. 또한, 선정평가 시 평가에 대한 일관성과 효율성 제고에 기여할 것이다.

• Design & Manufacturing
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• 제8권1호
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• pp.27-30
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• 2014

Alloy tool steel such as SKD11 and SKD61 or high speed tool like SKH51 are used as materials for semiconductor dies. Cavities, curl blocks, pot blocks and housings are made from those materials. To make those parts from alloy tool steel or high speed tool, one utilizes discharge machining, and mechanical machining including machining center, milling, drilling, forming grinding and others. In the process of cutting machining and polishing, the die materials become unsuitable for machining owing to bubbles and foreign substances in them, which hinders production process. Therefore, this study focuses on die material selection criteria, and on analysis and comparison of material characteristics to help companies to solve their problems, make die manufacture less burdensome and extend die life.

• 품질경영학회지
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• 제18권2호
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• pp.93-99
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• 1990

This paper considers the selection of process plans for a flexible manufacturing machine. Most of the planning models for the automated manufacturing systems are based on the assumption that for each part there is only one process plan available. This paper considers that for each part a number of different process plans are available, each of which may require specific types of tools. If the requisite tools are not on the machine, one or more tool switches must occur before the process plan can be processed. This paper develops an optimal algorithm of branch and bound method for the selection of process plans to minimize the number of tool switches.

• 대한산업공학회지
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• 제26권2호
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• pp.165-170
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• 2000

In order to perform a successful material cutting process, the operators are to select the suitable machining tools and cutting conditions for the cutting environment. Up to now, this has been a complicated procedure done by the data in the tool manufacturers' paper catalog and the operator's experiencial knowledge, so called heuristics. This research is motivated by the fact that using computer techniques in processing vast amount of data and information, the operator can determine the tool and cutting condition easily. In the developed program, the selection of milling cutter, insert, and components are combined to provide optimal cutting speed, depth of cut, feed rate, rpm, and power. This program also provides the selection routine for end mill, drilling, turning, and grinding where the suitable tools are selected by workpiece, holder type, cut type, and insert shape.

• 산업경영시스템학회지
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• 제21권45호
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• pp.265-277
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• 1998

The control chart has been used widely and importantly as a tool for statistical process control(SPC). Most companies are concerned with improving the quality and the productivity as well as reducing the cost, especially in today's highly competitive environment. Though SPC is known as a technique for consistent quality, it is not used properly due to lack of knowledge about it. It is required to develop a support system for control chart selection and interpretation that can be utilized by non-specialist without hard training or experiences. The support system was developed by applying the expert system tool to popular control charts. Though some researches on this area has been performed, the implemented results expose many problems in field applications due to the unsatisfactory explanation of the selected control chart and limited knowledge base for resolving the problems. This thesis presented an expert system for control chart as solution for these problems. The expert system for the control chart selection and interpretation is developed by using Turbo C and EXSYS which is an expert system development tool.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1784-1788
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• 2003

For the improvement of geometrical accuracy in end milling, cutting method and cutting condition selection are investigated in this paper. As machining processes are composed of several steps such as roughing, semi-finishing. and finishing, cutting forces and tool deflection are calculated considering surface shape generated by the previous cutting. The effects of tool teeth numbers, tool geometry, and cutting conditions on the form error are analyzed. Using the from error prediction method from tool deflection, cutting condition for geometrical accuracy improvement is discussed. The characteristics and the difference of generated surface shape in up and down milling are dealt with and over-cut free condition in up milling is presented. The form error reduction method by alternating up and down milling is also suggested. The effectiveness of the presented method is examined from a set of cutting tests under various cutting conditions. This research contributes to cutting process optimization for the geometrical accuracy improvement in die and mold manufacture.