• 한국군사과학기술학회지
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• 제2권2호
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• pp.83-91
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• 1999

Dynamic characteristic of manufacturing stage is understood and the utilization of each machine is maximized by developing on-line dynamic CAPP system to consider the overloads in the aircraft part manufacturing line. In this paper, a scheme of production planning and scheduling system was proposed through inspection about some predeveloped CAPP system. Developed production planning and scheduling system included process planning module. After precise inspection of some FMS line schema at domestic heavy industry, optimized FMS line was applied to aircraft part manufacturing and repairing factory. By virtue of considering overloads of factory and machine through on-line dynamic CAPP system, the utilization of resources is maximized and manufacturing lead time is minimized.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.118-121
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• 2002

In this study, we describe the development of viscous inspection equipment for flatron panel glass by Moire phenomenon and propose a new idea to develop an automatic inspection system for viscous or cord defects. It is possible to detect string viscous more easily and the equipment is practically being applied in production line. After using this equipment, the ratio of defective from customer is dropped significantly.

• 한국정밀공학회지
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• 제33권6호
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• pp.459-467
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• 2016

Using a line scan camera and a Galvano mirror, we constructed a high-speed line-scanning microscope that can generate 2D images ($8000{\times}8000pixels$) without any moving parts. The line scanner consists of a Galvano mirror and a cylindrical lens, which creates a line focus that sweeps over the sample. The measured resolutions in the x (perpendicular to line focus) and y (parallel to line focus) directions are both $2{\mu}m$, with a 2X scan lens and a 3X relay lens. This optical system is useful for measuring defects, such as spalling, chipping, delamination, etc., on the surface of carbon fiber reinforced plastic (CFRP) holes after machining in conjunction with adjustments in the angle of LED lighting. Defects on the inner wall of holes are measured by line confocal laser scanning. This confocal method will be useful for analyzing defects after CFRP machining and for fast 3D image reconstruction.

• 디지털융복합연구
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• 제16권3호
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• pp.303-309
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• 2018

컴퓨터 비전 기술은 인공지능의 한 분야로 인간의 눈의 기능을 기계가 수행 할 수 있도록 카메라로부터 영상 이미지를 취득하고, 알고리즘을 통하여 분석하고 판별한 후 생산부품의 양품과 불량을 판별하는 부품 검사에 많이 적용되고 있다. 볼트 생산 시스템에서 생산되는 볼트 탭의 유무를 컴퓨터 비전 기술을 적용하여 자동으로 불량품을 선별하는 장치를 개발하였다. 형상검사 방법으로는 라인 스캔방식으로 검사영역의 시작점과 끝점의 위치를 파악하여 높이를 측정하는 방법을 사용하였으며, 볼트 탭의 유무를 판별하기 위한 방식으로는 원형 스캔방식으로 검사영역의 평균 밝기 값의 차이를 측정하여 유사도를 구하는 방식을 사용하였다. 두 종류의 볼트 탭의 검사 성능실험에서 총 검사에 소요되는 시간은 분당 300개 검사가 가능하며, 완벽한 검사 정확도를 나타내어 생산라인에서 검사의 정확성과 효율성을 입증하였다.

• 산업공학
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• 제4권2호
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• pp.43-51
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• 1991

A line search method is developed to locate all the conerpoints of 2-dimensional polygon images for inspection purposes. This optimization-based method is used to approximate a 2-D curved object by a polygon. This scheme is also developed for inspection of objects in industrial environment. The inspection includes dimensional verification and pattern matching which compares a 2-D image of an object to a pattern image. The method proves to be computationally efficient and accurate for real time application.

• 한국가스학회지
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• 제15권1호
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• pp.15-21
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• 2011

본 논문에서는 정량적 위험성 평가 결과 위험경감조치로 제시한 ILI (In-line inspection, 배관내부검사)가 합리적으로 이행가능한지를 판정하기 위해 비용-편익 분석을 실시하였으며, 비용-편익 분석을 통해 ILI의 합리적인 이행시기를 결정하였다. 본 논문에서 편익의 산정은 인간의 생명 가치를 측정하는 VPF (Value of Preventing a Fatality; 사망자를 막는 가치)를 이용하였으며, 국내의 도시가스 고압배관의 위험경감조치에 대한 비용-편익 분석에 적정한 VPF 값은 20억원으로 하였다. 두 개의 사례연구 결과 위험경감조치로 제시된 ILI의 이행시기는 13년을 주기로 2회 (13년 및 25년) 또는 15년이 되는 해 1회 실시하는 것이 가장 합리적임을 알 수 있었다.

• 대한안전경영과학회지
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• 제10권3호
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• pp.253-265
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• 2008

In this paper, we developed a heuristic algorithm to assign job to workers in parallel line inspection process without sequence. Objective of assigning job in inspection process is only to assign job to workers evenly. But this objective needs much time and effort since there are many cases in assigning job and cases increase geometrically if the number of job and worker increases. In order to solve this problem, we proposed heuristic algorithm to assign job to workers evenly. Experiments of assigning job are performed to evaluate performance of this heuristic algorithm. The result shows that heuristic algorithm can find the optimal solution to assign job to workers evenly in many type of cases. Especially, in case there are more than two optimal solutions, this heuristic algorithm can find the optimal solution with 98% accuracy.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 하계종합학술대회논문집
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• pp.769-772
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• 1998

This paper present an efficient techniques for visual inspection of taped electronic parts, suitable for real time implementation. The main environments of developed system are IBM-compatible personal computer, frame grabber, digital input-output board. It is connected to the programmable logic controller unit of the taping machine in real time. Using a queuing structure, operator or extractor machine can remove easily the defect one from production line. Also, we design a new illumination system for sacquring shape and subface features of object. Therefore, it redue pre-processing step and processing time.

• 대한안전경영과학회지
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• 제14권1호
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• pp.167-177
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• 2012

In this paper, we raised the performance of heuristic algorithm to assign job to workers in parallel line inspection process without sequence. In previous research, we developed the heuristic algorithm. But the heuristic algorithm can't find optimal solution perfectly. In order to solve this problem, we proposed new method to make initial solution called FN(First Next) method and combined the new FN method and old FE method using previous heuristic algorithm. Experiments of assigning job are performed to evaluate performance of this FE+FN heuristic algorithm. The result shows that the FE+FN heuristic algorithm can find the optimal solution to assign job to workers evenly in many type of cases. Especially, in case there are optimal solutions, this heuristic algorithm can find the optimal solution perfectly.

• 센서학회지
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• 제15권5호
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• pp.328-333
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• 2006

Magnetic Flux Leakage (MFL) methods are widely employed for the nondestructive evaluation (NDE) of gas pipelines. In the application of MFL pipeline inspection technology, corrosion anomalies are detected and identified via their leakage filed due to changes in wall thickness. The gas industry is keenly interested in automating the interpretation process, because a large amount of data to be analyzed is generated for in-line inspection. This paper presents a novel approach to the tasks of data segmentation, feature extraction and depth estimation from gas pipelines. Also, we will show that the proposed method successfully identifying artificial defects.