• Title/Summary/Keyword: Methodology of Design

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Developing a Design Support System for Database Distribution : Relational Schema as an Input (데이터베이스 분산 설계 지원 시스템 개발: 관계형 스키마를 입력으로)

  • Lee, Hui-Seok;Ji, Jeong-Kang;Kim, Tae-Hun;Yeo, Ji-Yeong
    • Asia pacific journal of information systems
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    • v.6 no.1
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    • pp.165-194
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    • 1996
  • Data distribution is one of the most important steps in distributed database design. This paper proposes a methodology for distributing database by using a relational schema as an input. A design support system called DBDD (Database Distribution Design) is implemented within the framework of this methodology. The methodology consists of three phases such as (i) schema analysis, (ii) fragmentation, and (iii) allocation. In the schema analysis phase, all the table names are acquired from a global relational schema. In the fragmentation phase, fragments are generated according to transaction retrieval patterns. Furthermore, DBDD enhances the design quality by allocating fragments in a progressive manner. A real-life case is illustrated to demonstrate the practical usefulness of the DBDD.

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A methodology for view integration in manufacturing database design (제조 데이타베이스 설계에서의 뷰 통합 방안)

  • 신기태;박남규;박진우
    • Korean Management Science Review
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    • v.11 no.3
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    • pp.87-102
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    • 1994
  • Conceptual database design is an important activity because the performance of a DBMS heavily depends on the proper design of the database, and view integration is one of the most important phases of conceptual database design. During this phase, the individual views designed by separate user groups are integrated into a global view for the entire system. After the view integration, a database schema must be validated before it becomes a stable product of the design. In this paper, a methodology for view integration an validation is suggested. The individual views are modeled by entity-relationship model. The entities are integrated according to their name and domain information. After that, the relationships are merged by their constraints. We also present a methodology for checking redundant relationships which has an algorithmic description.

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Mass Customization Oriented Modular Design of Office-chair Considering Human Body Size (다양한 신체사이즈를 고려한 사무용의자 대량맞춤생산 지향 모듈화 설계방법론)

  • Hwang, Sang-Chul;Kim, Jin-Ho;Choi, Young
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.4
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    • pp.63-71
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    • 2010
  • Modular design is a very important design methodology that allows designers to develop a product family at low product development and production cost. This design methodology is also very powerful for products that require frequent design changes due to customer requirements. Most research on modular design is focused on the modularization based on functional decomposition, physical interface and manufacturing process of parts. In this paper, we propose a modularization method that takes size of human body parts into consideration for products which have physical interactions with the products such as office chairs and sport machines. Evaluation of modular design is based on dependence measurement between every pair of components in the design. In addition we proposed a module sizing method for the maximization of customer satisfaction in MC(Mass Customization) environment.

A Logical Design Methodology for Relational Databases Using the MAO (Multiple Aspects-based Object) Model (MAO 모델을 사용한 관계 데이타베이스의 논리적 설계방법론)

  • Cho, Dong-Young;Baik, Doo-Kwon;Hwang, Chong-Sun
    • Journal of the Korean Operations Research and Management Science Society
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    • v.16 no.2
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    • pp.49-64
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    • 1991
  • In this paper, we present a stepwise design methodology for relational databases using a new conceptual data model, the MAO(Multiple Aspects-based Object) model. Our methodology consists two steps : first, data requirements are conceptualized using the MAO model with concepts such as objects types and aspect types : second, the MAO model is transformed into the third normal form inn the relational model supported by commercial DBMs. A top-down approach is used for the MAO modelling in the first, step, and the transformation process in the second step can be automated. Our methodology supports easier and more database design of real world than other methodologies using existing data models.

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A Study on Design for Six Sigma Methodology for Aircraft Industry (항공 산업의 DFSS 적용방법에 관한 연구)

  • Sung, Su-Gyeong;Yoon, Hee-Kweon;Kwag, Sang-Hyug;Byun, Jai-Hyun
    • Journal of Korean Society for Quality Management
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    • v.40 no.3
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    • pp.316-326
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    • 2012
  • Purpose: In this paper, a Design for Six Sigma(DFSS) methodology based on DMADV(Define-Measure-Analyze-Design-Verify) roadmap is presented. Methods: DFSS tools are given for each DMADV phase which is suitable for the aircraft development process. A cost reduction case study of a navigation simulation is demonstrated. Results: DFSS roadmap are presented with implementation tools for each phase. Conclusion: We propose a DFSS methodology which can benefit the design and development personnel to implement DFSS not only in aircraft industry but also in other order-based industries in general.

Optimization of Sheet Metal Forming Process Based on Two-Attribute Robust Design Methodology (2속성 강건 설계를 이용한 박판성형공정의 최적화)

  • Kim, Kyung-Mo;Yin, Jeong-Je;Park, Jong-Cheon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.2
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    • pp.55-63
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    • 2014
  • Fractures and wrinkles are two major defects frequently found in the sheet metal forming process. The process has several noise factors that cannot be ignored when determining the optimal process conditions. Therefore, without any countermeasures against noise, attempts to reduce defects through optimal design methods have often led to failure. In this study, a new and robust design methodology that can reduce the possibility of formation of fractures and wrinkles is presented using decision-making theory. A two-attribute value function is presented to form the design metric for the sheet metal forming process. A modified complex method is adopted to isolate the optimal robust design variables. One of the major limitations of the traditional robust design methodology, which is based on an orthogonal array experiment, is that the values of the optimal design variables have to coincide with one of the experimental levels. As this restriction is eliminated in the complex method, a better solution can be expected. The procedure of the proposed method is illustrated through a robust design of the sheet metal forming process of a side member of an automobile body.

Design Space Methodology and Its Application in Interior Permanent Magnet Motor Design

  • Fan, Tao;Li, Qi;Wen, Xuhui;Xu, Longya
    • Journal of international Conference on Electrical Machines and Systems
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    • v.1 no.3
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    • pp.303-311
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    • 2012
  • An innovative interpretation of the per-unit interior permanent magnet (IPM) machine model known as Design Space is presented in this paper. Based on the proposed Design Space formulation, an effective computation method to predict IPM machine performance factors, such as the current and power factor in a full range of speeds, is proposed. A systematic methodology is summarized, which translates the full speed range machine design procedure into the region determination on the so-called Design Space. The effect of dc-link voltage is also analyzed in a similar manner with the current and power factor. A series of IPM motors have been designed, and a preferred motor is selected with the help of the proposed Design Space Methodology (DSM), which has the best tradeoff between the nominal voltage and the dropped voltage condition. Experiment results show that the selected motor satisfies the machine requirements and all the design constrains, such as the current and back-EMF limitations.

Specialized Product-Line Development Methodology for Developing the Embedded System

  • Hong Ki-Sam;Yoon Hee-Byung
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.5 no.3
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    • pp.268-273
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    • 2005
  • We propose the specialized product-line development methodology for developing the embedded system of an MSDFS (Multi Sensor Data Fusion System : called MSDFS). The product-line methodology provides a simultaneous design between software and hardware, high level reusability. However this is insufficient in requirement analysis stage due to be focused on software architecture, detailed design and code. Thus we apply the business model based on IDEF0 technique to traditional methodology. In this paper, we describe the processes of developing Core-Asset, which are requirement analysis, feature modeling, validation. The proposed model gives the efficient result for eliciting features, and ensures the high level reusability of modules performing on embedded system.

A Study on the Design of Rifling Angle by Setting up an Idealized Rifling Force Curve (이상적인 강선력 곡선에 의한 강선각 설계기법)

  • Cha, Kiup;Ahn, Sangtae;Cho, Changki;Choi, Euijung
    • Journal of the Korea Institute of Military Science and Technology
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    • v.18 no.1
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    • pp.15-21
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    • 2015
  • Rifling Force can be described with projectile velocity, gas pressure and rifling angle, etc. Under the same conditions, the character of the rifling angle decisively influences the rifling force. To reduce the harmful effect, locally distinct maximum of rifling force has to be avoided. The optimal design methodology of rifling angle curve had been developed by combined Fourier series and polynomial function. When it was tried newly to design the rifling angle curve, this design trial caused not to produce the lower rifling force than the existing design. Normally, the curve of the rifling angle is designed first, then the rifling force is set according to the rifling angle curve. However during the cause analysis, new design methodology was established to design the ideal rifling force curve before the rifling angle design. With this new methodology, the above optimal design method was analyzed and its limitation was confirmed.

Introduction of the Capacity Design Methodology in the Building Standard Law of Japan (개정된 일본 내진설계기준의 한계내력계산법의 소개)

  • 전대한;노필성
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.861-866
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    • 2002
  • This manuscript introduces the Capacity Design Methodology in the Building Standard Law of Japan revised at 2000, June. The Building Standard Law of Japan was revised into the performance-based design format following the trend of international. The structural performance was evaluated for two limiting states; soundness limit state and safety limit state. The design seismic forces were determined on taking into consideration (a)the properties of the planned building, (b)amplification by local surfaces geology, and (c)soil-structure interaction.

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