• Title/Summary/Keyword: Manufacturing Line

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A genetic algorithm for flexible assembly line balancing (유연조립라인 밸런싱을 위한 유전알고리듬)

  • Kim, Yeo-Geun;Kim, Hyeong-Su;Song, Won-Seop
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2004.05a
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    • pp.425-428
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    • 2004
  • Flexible assembly line (FAL) is a production system that assembles various parts in unidirectional flow line with many constraints and manufacturing flexibilities. In this research we deal with a FAL balancing problem with the objective of minimizing the maximum workload allocated to the stations. However, almost all the existing researches do not appropriately consider various constraints due to the problem complexity. Therefore, this thesis addresses a balancing problem of FAL with many constraints and manufacturing flexibilities, unlike the previous researches. To solve this problem we use a genetic algorithm (GA). To apply GA to FAL, we suggest a genetic representation suitable for FAL balancing and devise evaluation method for individual's fitness and genetic operators specific to the problem, including efficient repair method for preserving solution feasibility. The experimental results are reported.

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Using the obstacle position information of the mobile robot in the two-dimensional cartography Study (장애물 위치 정보를 이용한 모바일 로봇의 2차원 지도 작성에 관한 연구)

  • Lee, Jun-Ho;Hong, Hyun-Ju;Kang, Seog-Joo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.1
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    • pp.30-38
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    • 2014
  • The purpose of this study is to build and manage environment models with line segments from sonar range data on obstacles in unknown and varied environments. The proposed method therefore employs a two-stage data-transform process in order to extract environmental line segments from range data on obstacles. In the first stage, the occupancy grid extracted from the range data is accumulated to form a two-dimensional local histogram grid. In the second stage, a line histogram extracted from a local histogram grid is based on a Hough transform, and matching serves as a means of comparing each of the segments on a global line segments map against the line segments to detect the degree of similarity in the overlap, orientation, and arrangement. Each of these tests is formulated by comparing one of the parameters in the segment representation. After the tests, new line segments can be found at maximum-density cells in the line histogram, and they are composed onto the global line segment map. The proposed technique is demonstrated in experiments in an indoor environment.

Design of flexible assembly line for printed circuit board(PCB) manufacturing of amdahl company

  • Park, Kwangtae;Adiga, Sadashiv
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 1992.04b
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    • pp.159-168
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    • 1992
  • 생산라인의 line balancing이 흐름생산에 있어서 일관된 생산을 하기 위한 필수조건이다. 여러 다양한 제품을 생산하는 printed circuit board(PCB) 공장에서의 line balancing을 얻기 위해서는 mixed model line balancing절차를 설명하고자 한다.

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Development of a Virtual Simulator for Agile Manufacturing System

  • C., Sangmin;C., Younghee;B., Jongil;L., Manhyung
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.103-103
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    • 2000
  • In this paper to cope with the reduction of products life-cycle as the variety of products along with the various demands of consumers, a virtual simulator is developed to make the changeover of manufacturing line efficient to embody a virtual simulation similar to a real manufacturing line. The developed virtual simulator can design a layout of a factory and make the time scheduling. Every factory has one simulator so that one product can be manufactured in the factories to use them as virtual factories. We suggest a scheme that heightens the agility to the diversity of manufacturing models by making the information of manufacturing lines and products models to be shared. The developed unit simulator can construct a proper virtual manufacturing line along with the required process of products using several kinds of operator and work cell. A user with the simulator can utilize an interface that makes one to manage the separate task process for each manu(acturing module, change operator components and work cells, and easily teach tasks of each task module. The developed simulator was made for users convenience by Microsoft Visual C++ 6.0 that can develop a program supplying graphic user interface environment and by OpenGL of the Silicon Graphics as a graphic library to embody 3D graphic environment. Also, we show that the simulator can be used efficiently for the agile manufacturing by the communication among the factories being linked by TCP/IP and a hybrid database system made by a hierarchical model and a relational model being developed to standardize the data information.

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Die Manufacturing and Repair Using Laser-Aided Direct Metal Manufacturing (레이저 직접금속조형(DMM)기술에 의한 금형제작 및 보수)

  • 지해성;서정훈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.104-107
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    • 2002
  • Direct Metal Manufacturing (DMM) is a new additive process that aims to take die making and metalworking in an entirely new direction. It is the blending of five common technologies : lasers, computer-aided design (CAD), computer-aided manufacturing (CAM), sensors and powder metallurgy. The resulting process creates parts by focusing an industrial laser beam onto a tool-steel work piece or platform to create a molten pool of metal. A small stream of powdered tool-steel metal is then injected into the melt pool to increase the size of the molten pool. By moving the laser beam back and forth, under CNC control, and tracing out a pattern determined by a computerized CAD design, the solid metal part is built line-by-line, one layer at a time. DMM produces improved material properties in less time and at a lower cast than is possible with traditional fabrication.

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Development of Virtual Prototype for Labeling: Unit on the Automatic Battery Manufacturing Line (건전지 자동화 조립라인의 라벨링부의 Virtual Prototype 개발)

  • 정상화;차경래;김현욱;신병수;나윤철
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.357-362
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    • 2002
  • Most of battery industries are growing explosively as a core strategy industry for the development of the semi-conductor, the LCD, and the mobile communication device. In this thesis, dynamic characteristics of the steel can labeling machine on the automatic cell assembly line are studied. Dynamic characteristic analysis consists of dynamic behavior analysis and finite element analysis and is necessary for effective design of machines. In the dynamic behavior analysis, the displacement, velocity, applied force and angular velocity of each components are simulated according to each part. In the FEA, stress analysis, mode analysis, and frequency analysis are performed for each part. The results of these simulations are used for the design specification investigation and compensation for optimal design of cell manufacturing line. Therefore, Virtual Engineering of the steel can labeling machine on the automatic cell assembly line systems are modeled and simulated. 3D motion behavior is visualized under real-operating condition on the computer window. Virtual Prototype make it possible to save time by identifying design problems early in development, cut cost by reducing making hardware prototype, and improve quality by quickly optimizing full-system performance. As the first step of CAE which integrates design, dynamic modeling using ADAMS and FEM analysis using NASTRAN are developed.

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A study on the success factor of Quality Management in bath-tub & washbowl (위생기기 제조기업의 품질경영 성공요인에 관한 연구)

  • Hwang Kyoo-Ill;Lee Jae-ha
    • Proceedings of the Korean Society for Quality Management Conference
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    • 2004.04a
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    • pp.484-489
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    • 2004
  • The purpose of this study is to examine the success factor of Quality Management (QM) in the manufacturing conditions aspect of medium and small-sized sanitary enterprise. The requisite for manufacturing factors are classified into manufacturing human factors (the number of production employee, training and teaching, discuss on quality, manufacture expertness, etc.), manufacturing facility factors (coating, hardening, and molding equipment), manufacturing core component factors (temperature and viscosity, line, surface). And the indicator of quality outcomes are measured by reorder and recommendation to others.

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Selection Method for Optimal Shop Floor Control According to Manufacturing Environment (생산환경 변화에 따른 최적 Material Flow Control 선택방법)

  • Park, Sang Geun;Park, Sung Ho;Ha, Chunghun
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.36 no.2
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    • pp.81-90
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    • 2013
  • Material flow control (MFC) is a kind of operational policy to control of the movement of raw materials, components, and products through the manufacturing lines. It is very important because it varies throughput, line cycle time, and work-in-process (WIP) under the same manufacturing environments. MFC can be largely categorized into three types such as Push, Pull, and Hybrid. In this paper, we set various manufacturing environments to compare five existing MFC mechanisms: Push, Pull, and Hybrid (CONWIP, Gated MaxWIP, Critical WIP Loops, etc). Three manufacturing environments, manufacturing policies (make to stock and make to order), demand (low, medium, high), and line balancing (balanced, unbalanced, and highly unbalanced) are considered. The MFCs are compared in the point of the five functional efficiencies and the proposed compounded efficiency. The simulation results shows that the Push is superior in the functional efficiency and GMWIP is superior in the compounded efficiency.