COBOL 프로그래밍을 위한 자동화 도구의 설계 및 구현

정선환(Chung Sun Hwan),이창훈( Lee Chang hun) 한국정보과학회 1989 한국정보과학회 학술발표논문집 Vol.16 No.1

자동화 도구는 현재 사람이 하고 있는 컴퓨터조작이나 소프트웨어 개발 행위의 일부를 자동화도구가 대신해 주어서 사람에게 보다 편리한 소프트웨어 개발 환경을 지원해 주는 것이다. 본 논문에서는 설계 및 구현한 COBOL PROGRAMMING을 위한 자동화도구의 제어구조는 대화식으로 작성된 프로그램 명세를 입력하여 적절한 프로그램 문장으로 치환, 이를 텍스트화일에 저장하는데, 이 과정을 목적프로그램이 완성될때 까지 반복 수행한다. 본 논문의 자동화도구는 화면중심의 메뉴방식에 의해 작성되므로 기존 자동프로그래밍 도구에 비해 전문프로그래머 뿐만아니라 비전문가라도 쉽게 사용할 수 있으며 PROTOTYPE의 FEEDBACK에 의해 목적 프로그램을 생산하기 때문에 프로그램 작성 또는 유지, 보수가 간단하다는 장점이 있다.

旋削加工時 削切出口에서 發生하는 超硬工具의 破損機構에 關한 硏究

鄭璿煥 金烏工科大學校 1982 論文集 Vol.3 No.-

This paper deals with the failures of carbide tools during the exit phase in turning. The main emphasis of the present study was to classify and analyze the cause of tool failures at exit without the additional complications of wear. So, each cutting edge was used for only one cut in the experiments. Cutting test were performed with different exit angles, "ø". It was observed that the exit angle "ø" significantly affects the nature and probability of fracture at exit, but the entrance angle θ was found to have no effect on the failure. Three major types of tool failure were observed at exit in these "single-cut experiments." : i) Fracture at exit associated with fracture of the last portion of the workpiece. ii) Chip-tool adhesion and subsequent flaking off of tool material from the rake face on applying a small force to remove the welded chip. iii) Built-up-edge and subsequent chipping when small force was applied on the BUE after the cut.

6시그마 프로세스를 이용한 정류자(Commutator) 압입 공정개선에 관한 연구

정선환,최성대,양세영 한국기계가공학회 2005 한국기계가공학회지 Vol.4 No.2

Recently 6 quality control is an most important strategy to many enterprises in order to be a top company in the world, because it is an excellent scientific method to achieve the best quality control for their management and products. SY company is a small and medium one that has the quality problem for a long time such as occurring cracks on the surface of commutator at his assembly line while being assembled a rotor shaft and commutator of DC motor. This research was started to improve this problem by 6 process, and as the results of this study, first, to find three vital fews, second, to get an achievement of about 21% improvement for the fracture strength of commutator, and third, to be recognized to change into 6 quality control in SY company.

친환경 온/오프 다이어프램 밸브 개발

정선환(Seon-Hwan Cheong),최성대(Seong-Dae Choi),김신호(Shin-Ho Kim) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.4

Currently, most of all valves using at the semiconductor & LCD manufacturing process are pack less type. Such valves are needed to have the functions to protect perfectly from the leakage of fluid by using bellows and diaphragm instead of the grand packing. But not only those valves made in Korea are not available at this point, but also advanced foreign manufacturers do not open enough their data on the basic technology. Otherwise although they open the data a little, they are almost data about stainless steel for pneumatic valves. In this paper, it was focused on the fluid valves for chemical & DI water based on the data of steel valves which are already using commercially. And also this study concentrated to collect the basic developing data of Eco-On/Off diaphragm valve by ourselves.

LCD 모니터 힌지용 인장 스프링의 피로특성

정선환(Seon-Hwan Cheong),최성대(Seong-Dae Choi),김기만(Ki-Man Kim),변용근(Yong-Kun Byun),양승철(Seung-Cheol Yang) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.1

The spring is an important mechanical parts to improve the functions of precision machines, automobiles, ships, industrial machines, and IT devices etc.. The hinge mechanism for LCD monitors is very important to support and maintain the proper position of monitor panel, and the tension spring which is a major parts of hinge mechanism plays a significant roll to provide the supporting force positioning the monitor panel. In this paper, an analysis and experiment were carried out to investigate the fatigue characteristics of the tension spring of hinge mechanism, such as hardness test, fatigue test and fractography analysis. As a result of this study the SWPB with heat treatment and shot peening was found to have the optimal design conditions of tension spring for LCD monitor hinge mechanism.

NC 툴링시스템의 標準化에 關한 硏九 (第2報) : Computerized Tooling System for NC Lathe NC 旋盤 툴링시스템의 電算化

鄭璿煥 金烏工科大學校 1985 論文集 Vol.6 No.-

The production cost of a component in theNC machine tool is consisted of part programming and tape preparation cost, machining cost, and tool cost. If we want to reduce the production cost of a component, we must simultaneously fall the three cost elements down. But I will only consider the one of reduction methods of part programming cost in this paper. It takes usually much time to construct a tool layout which is needed to calculate the position of each tool point from the machining coordinates. If we would cancel the man hour to draw a tool layout, it should be increased the productivity in the NC machining processes. In this paper, I developed a computerized tooling system for NC Lathe using a personal computer ; MCS 6502 microprocessor, TriGem 20XT model.

NC파트 프로그래밍을 위한 전문가시스템

정선환 대한기계학회 1994 대한기계학회논문집 Vol.18 No.11

An expert system for NC part programming of NC lathe (ESPP-1) is developed as a part of Computer-Adied Manufacturing system. Conventional computer-assisted part programming system essentially requires an NC part programmer who is an expert in NC part programming. But the developed ESSP-1 can allow an inexperienced person to make an excellent NC data for the NC Lathe without any problem, since the system has a knowledge base composed of EIA and ISO NC code, feed rate, spindle speed, machining coordinates selection, and tool selection etc., which were directly evoked from some skilled NC part programmers, and referenced some machining handbooks. This paper discusses the algorithm of the expert system for NC part programming of the NC lathe (ESPP-1) and the performance comparisons between the developed expert system and the conventional system.

반도체 실리콘 웨이퍼 가공용 폴리싱머신의 구조해석에 관한연구

정선환(Seon-Hwan Cheong),최성대(Seong-Dae Choi),권현규(Hyun-Kyu Kwon),손현수(Hyon-Su Son) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-

Although Korea is now the top nation to produce non-memory semi-conductors in the world, but there are lacked informations about the researches and developments for the domestic equipments to manufacture the accurate silicon wafer such as a lapping, and polishing machine. Therefore in this study, as the consideration to develop a domestic polishing machine in the future, some trials were carried out to take some basic design data being useful to improve the structure of a specified polishing machine for silicon wafer. It was focused in plate and frame part that is base part in a polishing machine. Through its' 3D modeling, and structural analysis, the problems were investigated the deformation and stress of major parts, and the improvement methods were proposed by the results of analysis. As results, the thermal deformation in plate that contacts directly with silicon wafer was dominated, and they were known that it was very important to review the design factors to get a stability of thermal, and a structural robustness, too.

Design of Vibratory System Subjected to Lateral Vibrations

鄭璿煥,盧承勳 金烏工科大學校 1989 論文集 Vol.10 No.-

본 연구는 횡진동을 받는 기계시스템 설계의 최적화에 관한 연구로서, 시스템의 구성은 베어링에 의해 지지되고 기어축과 연결된 유연한 2개의 질량이 달린 로터로 되어 있다. 최적설계의 구간과 예가 조사되었으며 각 구간에 대한 최적설계 조건이 고찰 되었다.

칼라 TV 생산 라인의 자동화 구축에 관한 연구

정선환,최성대,유종규 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

The Toyota Production System (TPS) developed by Toyota corporation is a management principle and production model to improve values added through eliminate of waste. Since the oil shock in 1970s, the TPS has drawn the worldwide attentions as a main factor of competitiveness of Japanese manufacturing system and has been studied and implemented in many countries regardless of size and types of industry. For the correspond to various customer's requirement, it is required to establish on time delivery procedure and to shorten lead time. Therefor it intended to establish TPS which is adopted to 7 losses reduction and JIT(Just In Time). In this paper, the automatic production line for color TV manufacturing by TPS was developed and proved tp push up two times of productivity, to reduce the 25 workers at a time, and to widen the flexibility of manufacturing from 14" to 25" TV