• Title, Summary, Keyword: manufacturing processes

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Application of Discrimination Information (Cross Entropy) as Information-theoretic Measure to Safety Assessment in Manufacturing Processes

  • Choi, Gi-Heung;Ryu, Boo-Hyung
    • International Journal of Safety
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    • v.4 no.2
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    • pp.1-5
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    • 2005
  • Design of manufacturing process, in general, facilitates the creation of new process that may potentially harm the workers. Design of safety-guaranteed manufacturing process is, therefore, very important since it determines the ultimate outcomes of manufacturing activities involving safety of workers. This study discusses application of discrimination information (cross entropy) to safety assessment of manufacturing processes. The idea is based on the general principles of design and their applications. An example of Cartesian robotic movement is given.

Application of Information-theoretic Measure (Entropy) to Safety Assessment in Manufacturing Processes

  • Choi, Gi-Heung
    • International Journal of Safety
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    • v.4 no.1
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    • pp.8-13
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    • 2005
  • Design of manufacturing process, in general, facilitates the creation of new process that may potentially harm the workers. Design of safety-guaranteed manufacturing process is, therefore, very important since it determines the ultimate outcomes of manufacturing activities involving safety of workers. This study discusses application of information-theoretic measure (entropy) to safety assessment of manufacturing processes. The idea is based on the general principles of design and their applications. Some examples are given.

Bench Mark Test on Rapid Prototyping Processes and Machines for Functional Prototypes (기능성 시제품 생산용 쾌속조형공정의 성능비교시험)

  • Kim Gi-Dae;Sung Joo-Hyung
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.6
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    • pp.187-195
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    • 2006
  • FDM, SLS, and EOS processes are the layered manufacturing processes far functional prototypes. In this paper, bench mark tests of those processes were carried out using various materials. The test includes mechanical properties, such as tensile and compressive strengths, hardness, impact strength, and heat resistance, and surface roughness, shape and dimensional accuracy, manufacturing time, and manufacturing costs. It is verified that SLS method is advantageous in surface roughness and manufacturing time, EOS method in shape accuracy, and FDM method is great in manufacturing costs.

Self-organizing neuro-tracking of non-stationary manufacturing processes

  • Wang, Gi-Nam;Go, Young-Cheol
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.403-413
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    • 1996
  • Two-phase self-organizing neuro-modeling (SONM). the global SONM and local SONM, is designed for tracking non-stationary manufacturing processes. Radial basis function (RBF) neural network is employed, and self-tuning estimator is also developed for the determination of RBF network parameters on-line. A pattern recognition approach is presented for identifying a correct RBF neural network, which is used for identifying current manufacturing processes. Experimental results showed that the proposed approach is suitable for tracking non-stationary processes.

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A Study on Manufacturing Processes of Street-lighting System using COH LED Package (COH형 LED 패키지를 이용한 가로등 생산공정에 관한 연구)

  • Lee, Jong Hang;Yang, Keun Ju
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.3
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    • pp.349-355
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    • 2013
  • Recent high oil price results in the development of energy saving technology such as LED lighting system. Street-lighting system using COH LED package can save energy because the heat dissipation through cupper base is better than conventional technology. Studies on manufacturing processes of lighting system are insufficient even though LED package design and its heat analysis have been studied. This study focuses on the problem and solution of manufacturing processes such as LED packaging process, optimized emission angle, and LED bar dimension for mechanical assembly. As a result, we established better manufacturing alternatives of LED packaging and street-lighting system with higher lighting efficiency of 84 lm/W, as well as good illumination intensity of 39.7 lux at 6 m from lighting source.

Design of Data Warehouse System for Reducing Defect Rate in Automotive Pulley Manufacturing Process (자동차 풀리 제조공정의 불량률 감소를 위한 데이터 웨어하우스 구조 설계)

  • Lee G.B.;Kim B.H.;Oh B.H.;Ju I.S.;Jang J.D.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.133-138
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    • 2005
  • Automotive pulleys play a key role in driving the cooling pump, oil pump, air-conditioner and so on by using an engine power. Researches on design processes and technologies of the pulleys can be found in many literatures. On the other hand, the areas related to manufacturing processes of the pulleys have been treated negligently. Vast data extracted from various information systems are transformed, integrated, and summarized to become a special database for helping users make a decision. The database, namely the data warehouse has been popularly used in the marketing and customer management of enterprises and recently applied to improve the design and manufacturing processes. In this study the manufacturing process of pulleys were analyzed through the intensive investigation of shop-floors and the interviews with workers and managers. The defects generated during a manufacturing process were categorized in a few types and the causes of defects examined for extracting the dominant parameters in the setup process for producing pulleys. As the first step to construct the data warehouse for the manufacturing processes of pulleys, authors proposed its architecture focused on the reduction of defect rate during the setup process.

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A Comparative Analysis between Manufacturing and Transactional/Service Processes of Six Sigma Quality Improvement (제조부문과 사무간접/서비스부문의 6시그마 프로세스 개선활동 비교분석)

  • Yoon, Jae-Wook;Kim, Bo-Hyoung
    • Journal of the Korean Society for Quality Management
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    • v.36 no.4
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    • pp.37-46
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    • 2008
  • There are big differences in six sigma projects between manufacturing processes and transactional/service processes. This paper analyzed the differences between the two areas by examining 18 six sigma case studies in Korean companies. To characterize six sigma case studies, step-by-step questions and check criteria were developed based on 12 step DMAIC methodology. On the basis of those characterized data, the differences between two areas were analyzed. Significant differences were found in the number of CTQs, validation of measurement systems, methods to determine improvement objectives, the methods to elicit improvement plans and types of control systems. The most significant difference was that statistical tools were widely used in manufacturing processes, but qualitative tools were used in transactional/service processes during improvement phase.

A Study on Environmentally Conscious Manufacturing Processes using LCA (환경친화적 절삭가공방법에 관한 연구 - LCA적용)

  • 김종복;한영근
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • pp.625-629
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    • 2000
  • The objective of ECMS(Environmentally Conscious Manufacturing Systems) is to consider environmental effects through the entire product life cycle from product development stage to design, manufacturing, supplying, using and disposing stage. Recently, environment-oriented recycling, reusing and manufacturing technologies have been researched actively in every engineering fields. In the field of chemical engineering, HHS (Health Hazard Scores) which classifies and analyzes hazardous materials in production processes has been presented. Metal cutting processes also have a lot of harmful factors, and especially hazardous components in cutting fluids have been known to have a bad effect on workers and working area. However, research works such as HHS have been little accomplished in metal cutting processes. In this research, a environmentally conscious machining process is presented by classifying hazardous components in cutting fluids, by using LCA(Life Cycle Assessments) and HHS method, and by evaluating environmental effects from cutting fluids.

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The Effects of Product, Process, and Facilities Characteristics on the Conversion Processes and Outcomes for Cellular Manufacturing : An Empirical Study

  • Choi, Moo-Jin;Jun, Minjoon
    • Korean Management Science Review
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    • v.12 no.2
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    • pp.165-188
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    • 1995
  • The conversion processes from traditional job shops to cellular manufacturing systems can be viewed as an aggregation of cause-and-effect relationships among many strategic, managerial, and technical variables. Therefore, management needs to fully understand these interacting variables and possible relationships between the variables to successfully convert their plants to cellular manufacturing systems. The purpose of this study is to assist such management's needs in part. The objectives of this research are i) investigating contingency variables that may affect the conversion processes and outcomes to cellular manufacturing systems and ii) examining relationships between the variables and the conversion processes and outcomes. In this paper, particularly three categories of variables are examined: product, process routing, and process technology / facilities characteristics. Literature review and the mail survey method are used. The results are compared and synthesized with the findings of previous studies for useful discussions. Some previous arguments and propositions are empirically supported.

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Finite Element Analysis of Thermal Deformations for Microaccelerometer Sensors using SOI Wafers (SOI웨이퍼의 마이크로가속도계 센서에 대한 열변형 유한요소해석)

  • 김옥삼;구본권;김일수;김인권;박우철
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.4
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    • pp.12-18
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    • 2002
  • Silicon on insulator(SOI) wafer is used in a variety of microsensor applications in which thermal deformations and other mechanical effects may dominate device Performance. One of major Problems associated with the manufacturing Processes of the microaccelerometer based on the tunneling current concept is thermal deformations and thermal stresses. This paper deals with finite element analysis(FEA) of residual thermal deformations causing popping up, which are induced in micrormaching processes of a microaccelerometer. The reason for this Popping up phenomenon in manufacturing processes of microaccelerometer may be the bending of the whole wafer or it may come from the way the underetching occurs. We want to seek after the real cause of this popping up phenomenon and diminish this by changing manufacturing processes of mic개accelerometer. In microaccelerometer manufacturing process, this paper intend to find thermal deformation change of the temperature distribution by tunnel gap and additional beams. The thermal behaviors analysis intend to use ANSYS V5.5.3.