• Title/Summary/Keyword: Manufacturing system in fields

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Multivariate Process Capability Index Using Inverted Normal Loss Function (역정규 손실함수를 이용한 다변량 공정능력지수)

  • Moon, Hye-Jin;Chung, Young-Bae
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.41 no.2
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    • pp.174-183
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    • 2018
  • In the industrial fields, the process capability index has been using to evaluate the variation of quality in the process. The traditional process capability indices such as $C_p$, $C_{pk}$, $C_{pm}$ and $C^+_{pm}$ have been applied in the industrial fields. These traditional process capability indices are mainly applied in the univariate analysis. However, the main streams in the recent industry are the multivariate manufacturing process and the multiple quality characteristics are corrected each other. Therefore, the multivariate statistical method should be used in the process capability analysis. The multivariate process indices need to be enhanced with more useful information and extensive application in the recent industrial fields. Hence, the purpose of the study is to develop a more effective multivariate process index ($MC_{pI}$) using the multivariate inverted normal loss function. The multivariate inverted normal loss function has the flexibility for the any type of the symmetrical and asymmetrical loss functions as well as the economic information. Especially, the proposed modeling method for the multivariate inverted normal loss function (MINLF) and the expected loss from MINLF in this paper can be applied to the any type of the symmetrical and asymmetrical loss functions. And this modeling method can be easily expanded from a bivariate case to a multivariate case.

Selective Electrodeposition on Titanium Surface Using Laser Beam (레이저빔을 이용한 티타늄 표면에서의 선택적 구리 전해도금)

  • Shin, Hong Shik
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.26 no.1
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    • pp.44-49
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    • 2017
  • Titanium has been used in various fields due to its good corrosion and erosion resistance, and superior mechanical properties. The process for selective electro-deposition on a titanium surface using laser beam is proposed in this paper. The process consists of laser irradiation, electro-deposition, and ultrasonic cleaning. Laser irradiation can change the surface morphology of titanium. Through laser irradiation, the surface cleaning effect and a rough surface can be achieved. The surface roughness of titanium was measured according to the laser beam conditions. The characteristics of selective electro-deposition on titanium surface according to surface roughness are investigated by various analytical methods such as SEM, and EDS.

Dislocation Density Propagation adjacent to the Low Angle Grain Boundaries of Polycrystalline Materials (다결정 미세입자 소각입계면에서의 전위밀도 확산)

  • Ma, Jeong-Beom
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.20 no.5
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    • pp.618-622
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    • 2011
  • Specialized large-scale computational finite-element and molecular dynamic models have been used in order to understand and predict how dislocation density emission and contact stress field due to nanoindentation affect inelastic deformation evolution scales that span the molecular to the continuum level in ductile crystalline systems. Dislocation density distributions and local stress fields have been obtained for different crystalline slip-system and grain-boundary orientations. The interrelated effects of grain-boundary interfaces and orientations, dislocation density evolution and crystalline structure on indentation inelastic regions have been investigated.

Development of Knowledge Sharing Platform for Molding & Forming Technology (금형·성형 기술을 위한 생산기반 지식공유형 플랫폼 개발)

  • Bae, S.M.;Lee, H.W.;Heo, Y.M.;Shin, G.H.;Lee, J.W.;Yoon, G.S.
    • Transactions of Materials Processing
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    • v.20 no.8
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    • pp.534-539
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    • 2011
  • The production technology is the basic of manufacturing for various materials and components. This technology can influence the quality and productivity of leading export products such as automobile, ship, and electronic device. Besides, the production technology is very useful to apply to other manufacturing fields and has a great ripple effect. However, it is very difficult to make the production technology into standardization and knowledge-based database because the production technology is dependent in hands-on experience. In this study, the knowledge-sharing platform for the molding & forming technology which is a branch of the production technology is introduced. This platform is web-based system and has the knowledge authoring tool technologies storage, semantic database, and web portal service. Therefore, the molding & forming technology can be shared and spread easily by the knowledge-sharing platform.

Construction of CORBA Based Integration of Monitoring and Control Systems (CORBA를 이용한 통합 감시 제어 시스템의 구축)

  • 주상윤;강병필
    • Korean Journal of Computational Design and Engineering
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    • v.5 no.1
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    • pp.33-41
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    • 2000
  • A monitoring and control system, as a broker to connect work-fields with higher departs, gives a great effect on capacity and reliability of a manufacturing system. However, it is very difficult to construct an integrated monitoring control system in a shop with diverse equipment. This paper proposes a CORBA based scheme to construct an integrated system for monitoring and control of equipment in a machining shop. The system is developed by applying the object oriented technology. Thus, its design and maintenance are not only early but it can cope with variation of production situation flexibly. Finally, we introduce a prototype using a milling machine, a robot, PLC's, etc.

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Robust controller design for RTP system using weighted mixed sensitivity minimization (하중 혼합감도함수를 이용한 RTP 시스템의 견실제어기 설계)

  • 이상경;오도창;박홍배
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.434-437
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    • 1997
  • In this paper, we present an $H^{\infty}$ controller design of RTP system satisfying robust stability and performance using weighted mixed sensitivity minimization. In industrial fields, RTP system is widely used for improving the oxidation and the annealing in semiconductor manufacturing process. The main control factors are temperature control of wafer and uniformity in the wafer. The control of temperature and uniformity has been solved by PI control method. We improve robust stability and performance of RTP system by the design of $H^{\infty}$ controller using the weighted mixed sensivity function. An example is proposed to show the validity of proposed method.d.

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A Study of the Present Conditions and Consideration of Manufacture-Innovative Instruction Methods in Korea (국내 제조혁신 교육방법의 현황과 고찰)

  • Kim, Eun-Bi;Jeon, Tae-Woong;Han, Chang-Hee
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.35 no.2
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    • pp.147-154
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    • 2012
  • In the manufacturing industry, fostering talented workers has become a core activity as well as an important resource leading to manufacturing enterprises' innovative activities, which has come to the fore as one of the biggest success factors for innovative activities indeed. In other countries, there are many researches actively conducted on talent-fostering programs related to manufacture innovation. In Korea, however, manufacturers or several different education agencies don't actively carry out manufacture innovation instructions and have failed to faster special competent workers since their instructions focus on theories most of the time. Therefore, this study was conducted to understand the present conditions of manufacture-innovative instructions in Korea by classifying them in a method of educational technology and to investigate various teaching methods through oversea cases and cases from non-manufacture fields so that it might make a proposal for a better manufacture-innovative instruction method.

Development of Operation Planning System Considering Machining Safety (가공 안정성을 고려한 작업설계시스템의 개발)

  • Park, Byoung-Tae;Seo, Ji-Han;Kim, Hong-Jae;Oh, Young-Jin
    • Proceedings of the Safety Management and Science Conference
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    • 2008.11a
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    • pp.421-427
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    • 2008
  • In manufacturing industry, cutting parameters have an influence on reducing the production cost and time and deciding the quality of a final product However, owing to governmental regulations and the change of owner's cognizance, the machining safety becomes important in those fields relatively. The paper presents an intelligent operation planning system considering machining safety for milling operations. The main issue of the system is to determine the cutting parameters in achieving a balanced consideration of productivity and worker's safety. The detailed algorithm and functions of the developed system is introduced and then discussed.

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A case of digital maxillary complete denture and mandibular implant overdenture fabricated by CAD-CAM technique (완전 무치악 환자에서 CAD-CAM 기법을 이용한 상악 총의치 및 하악 임플란트 피개의치 수복: 증례 보고)

  • Kim, Kun Min;Oh, Kyung Chul;Kim, Sang Hyun;Han, Chol Gwan;Kim, Jee Hwan
    • The Journal of Korean Academy of Prosthodontics
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    • v.59 no.4
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    • pp.442-450
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    • 2021
  • The CAD-CAM technique is a rapidly developing field in the dental field and is applied to various fields of prosthetic treatment. Among them, the manufacturing of dentures using the milling technique classified as subtractive manufacturing is one of the commercialized digital full denture manufacturing methods. At the same time, it is possible to more efficiently manufacture a metal framework for implant overdenture by selective laser sintering or melting technique classified as an additive manufacturing method. The purpose of this article is to describe the fabrication of CAD-CAM maxillary complete denture and mandibular implant overdenture as well as its features.

A study of the design and control system for the ultra-precision stage (초정밀 스테이지 설계 및 제어 시스템에 관한 연구)

  • Park Jongsung;Jeong Kyuwon
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2005.05a
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    • pp.54-59
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    • 2005
  • Recently, the ultra-precision stage is widely used in the fields of the nano-technology, specially in AFMs(Atomic Force Microscope) and STMs(Scanning Tunneling Microscope). In this paper, the ultra-precision stage which consists of flexure hinges, piezoelectric actuator, and ultra-precision linear encoder, is designed and developed. The guide mechanism which consisted of flexure hinges is analyzed by Finite Element Method. And we derived the transfer function of the system in 1st order system from step responses according to the magnitude. We performed simulation for the model to tune the control gain and applied the gains to the developed system. Experimental results found that the stage can be controlled in 5 nm resolution by PID controller.

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