• 한국공작기계학회논문집
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• 제16권5호
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• pp.162-165
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• 2007

TFT-LCD process has two advantages as compared with the semiconductor-process. It is that cycle time is short and number of the final products are small. But it needs complicated inspection / assembly line to be treated manually and much higher labor costs in the TFT-LCD process. Also, It is necessary to build PICS(Production Information and Control System) which is automated and intelligent. In this paper, an automated process of LCD module assembly line that can increase productivity and reduce the cost of production to strengthen the competitiveness corresponding with global market is planned in comparison with its manual/semi-auto. It is noted that The automated line for COG$\sim$FOG process replacing with the existing facilities had the following effects; the productivity is increased to about 1.5 times and labor cost reduced 85%. In addition, whole assembly line can be short and simple.

• KSBB Journal
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• 제13권4호
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• pp.461-467
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• 1998

A fermentation system was supplemented with a device for the measurement of the durations of alkali pump feeding for automatic pH control and an A/D convertor for precise monitoring of pH value by computer. A software program was developed to measure buffer capacities from the pH signal and the pH control signal during fermentation. By measuring the buffer capacity on-line, levels of acetic acid were estimated by a software sensor using pH signal in a fermentation process of E.coli growing in a minimal medium. The measured values of acetic acid showed correlation to those of estimated by the software sensor. Lacitic acid production was also successfully estimated by the values of buffer capacities measured on-line.

• 산업공학
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• 제5권1호
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• pp.35-46
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• 1992

This paper deals with analysis of material handling system efficiency of a heat-exchanger manufacturing line. This line is a typical flow shop type assembly line which consists of 10 steps of assembly stations. Each station have one or two workers who assemble and move components for the job, and no special transporters for component's movement. Therfore, all the workers are involoved in unnecessary moving activities which decrease overall production efficiencies of the line. To improve productivities, production outputs and worker's job performances for this assembly line, the several alternatives are considered such as installing new conveyor lines and automatic guided vehicle(AGV) system. Analyzing economic feasibilities and responses of the system alternatives, an experimental simulation model is built suing SIMAN Ver. 3. 5 simulation language with CINEMA package for animation of the process flow. Through this animation process a vivid picturial analysis could performed on the process flow.

• 한국시뮬레이션학회논문지
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• 제17권4호
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• pp.51-60
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• 2008

본 논문의 목적은 생산성 향상을 위한 시뮬레이션 모델의 구축과 활용으로, 자동차 솔레노이드 밸브를 생산하는 국내의 한 중소기업을 대상으로 최적 버퍼 할당 문제를 시뮬레이션을 통하여 해결하였다. 이를 위하여 생산 라인을 구성하고 있는 주요 요소나 운영 정책 등이 변화했을 때 이러한 변화가 생산량에 어떠한 영향을 주는지를 확인 할 수 있도록 생산 라인의 공정과 작업 내용 및 순서, 공정 수행시간, 총 근무 시간, 가동률, 작업 효율, 불량률, 재공재고 등을 주요 입력 변수로 설정하였으며, 실제 생산라인 운영 결과와의 비교를 통해 이를 검증하였다. 본 논문에서 대상으로 한 솔레노이드 생산라인은 공정 중의 버퍼가 지나치게 많은 상황이지만, 버퍼를 줄이게 되면 결품 발생으로 생산이 중단되는 경우가 발생하기 때문에 많은 양의 버퍼를 유지하고 있었다. 본 논문에서는 이러한 문제를 해결하기 위하여, 시뮬레이션 모델을 구성, 검증하고 이를 활용하여 생산에 영향을 미치지 않는 최적의 버퍼 값을 결정 하였다. 본 본문에서 구축된 시뮬레이션 모델은 생산 라인에 영향을 미치는 많은 요소들을 입력 요소로 고려할 수 있도록 구성되었으며, 최적 버퍼 할당 뿐 아니라, 다양한 목적의 분석에 활용이 가능하다.

• 한국시뮬레이션학회논문지
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• 제17권2호
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• pp.63-74
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• 2008

공정 개선의 문제는 원가 절감, 수익구조 개선을 목표로 하는 생산 전략부서, 생산 계획에 의해 제시된 제품의 목적 생산량을 달성할 수 있는 공정 설계하고자 하는(설계 공정 능력, Tact time) 공정 설계 부서의 공통 요구사항이다. 목표하는 생산량을 달성하기 위해 작게는 라인밸런싱(Line-Balancing), 병목공정 제거를 수행하고 있으며, 크게는 설비 증설, 작업자 증원 등의 공정 개선을 시도한다. 문제는 대부분의 경우, 공정 개선 프로세스가 정적 예측 기반의 수리적인 방식에 기인하고 있다는 점이며, 특히 라인 생산 기반의 컨베이어 공정의 경우, 컨베이어의 이송 능력에 따른 대기시간 부분이 배제되고 있다는 것이다. 공정 대기시간은 설비의 정미시간과는 별개의 문제로 설비의 싸이클 타임(Cycle Time)의 수치에 따라 변동하는 변수로서 중요하다. 이에 본 논문에서는 H 사의 컨베이어 라인 공정을 대상으로 이산 사건 기반의 시뮬레이션을 수행하여 일련의 공정 개선 프로세스를 밟아가며, 컨베이어에 의해 발생하는 공정 대기시간의 공정 개선에의 기여도를 측정하여 공정 개선의 주요 변수로서 제시하고자 한다.

• 한국시뮬레이션학회논문지
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• 제12권3호
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• pp.41-53
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• 2003

The major components of an engine are engine block (or cylinder block), cylinder head, crank shaft, connecting rod and cam shaft. Thus the engine shop usually consists of six sub-lines, five machining lines and one assembly line. Flow line is the typical concept of layout for machining these parts, especially for engine block. In order to design an engine block machining line, several factors should be considered such as yearly production target, working hours, machines, tools, material handling equipments and so on. If the designers of manufacturing line were unaware of some factors those would be influenced on the system performance, it would make greater problems in the phase of mass production. Therefore the initial design of engine block machining line should be verified carefully. Simulation is the most powerful tool for analyzing the initial layout. This paper introduces the major factors those should be considered for designing the machining line and their effects on the system performance. 3D simulation models are developed with QUEST. Using the simulation model developed the initial layout is analyzed, and we suggest some ideas for improvement.

• 한국경영과학회지
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• 제36권2호
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• pp.51-65
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• 2011

We compared a CONWIP(constant work-in-process) system with a kanban system in a production line with constant processing times. Based on the observation that a WIP-controlled line production system such as CONWIP and kanban is equivalent to a m-node tandem queue with finite buffer, we applied a max-plus algebra based solution method for the tandem queue to evaluate the performance of two systems. Numerical examples with 6 workstations were used to demonstrate the proposed analysis. The numerical results support the previous studies that CONWIP outperforms kanban in terms of expected waiting time and WIP. Unlike the kanban case, sequencing workstations in a CONWIP does not affect the performance of the system.

• 게임&엔터테인먼트 논문지
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• 제2권1호
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• pp.27-34
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• 2006

본 논문에서는 완성된 수묵화나 여러 회화적 효과를 지닌 그림을 가지고 그곳에 있는 라인 패턴을 자동으로 추출한 후, 자동으로 스케치에 그 라인 패턴을 입혀주는 방식을 연구하였다. 이를 이용해 전체 프레임 중간에 애니메이터가 완성한 키 프레임을 받고, 다른 프레임들과의 대응 라인을 찾은 후 패턴을 자동으로 입혀 중간 프레임들을 얻어내는 결과를 보여준다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.310-313
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• 1996

In this paper, a neural control algorithm is proposed on the automation of adjustment process. The adjustment processes in camcoder production line are modelled, and the processes are adjusted automatically by means of off-line supervisory trained multi-layer neural network. We have made many experiments on the several adjustment processes by using the control algorithm. There are many unexpected troubles to achieve the desirable adjust time in the practical application. To overcome those, some auxiliary algorithms are demanded. As a result, our proposed algorithm has some advantages - simple architecture, easy extraction of the training data without expertises, adaptability to the varying systems, and wide application for the other resemble processes.

• 한국소음진동공학회논문집
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• 제13권7호
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• pp.532-538
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• 2003

This paper studies on the noise reduction for a small automobile DC Motor (a window motor) using the 6 sigma process. The application of 6 sigma process suggested reliable and valuable statistical data for the quality of the DC motor at the production line. In the measurement step in 6 sigma process. the FMEA(failure mode effect analysis) were used for the detection of noise sources. The application of 6 sigma Process gave not only the improving method for the quality of the DC motor but also the confidence of improvement Itself since it was done on the basis of the test results for a number of DC motors at the production line. Consequently the 6 sigma process was proved very effective for the noise reduction at the production line.