• Title, Summary, Keyword: modular components

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Components Clustering for Modular Product Design Using Network Flow Model (네트워크 흐름 모델을 활용한 모듈러 제품 설계를 위한 컴포넌트 군집화)

  • Son, Jiyang;Yoo, Jaewook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.7
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    • pp.263-272
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    • 2016
  • Modular product design has contributed to flexible product modification and development, production lead time reduction, and increasing product diversity. Modular product design aims to develop a product architecture that is composed of detachable modules. These modules are constructed by maximizing the similarity of components based on physical and functional interaction analysis among components. Accordingly, a systematic procedure for clustering the components, which is a main activity in modular product design, is proposed in this paper. The first phase in this procedure is to build a component-to-component correlation matrix by analyzing physical and functional interaction relations among the components. In the second phase, network flow modeling is applied to find clusters of components, maximizing their correlations. In the last phase, a network flow model formulated with linear programming is solved to find the clusters and to make them modular. Finally, the proposed procedure in this research and its application are illustrated with an example of modularization for a vacuum cleaner.

Control of Circulating Current in Modular Multilevel Converter under Unbalanced Voltage using Proportional-Resonant Controller

  • Quach, Ngoc-Thinh;Chae, Sang Heon;Kim, Eel-Hwan
    • Proceedings of the KIPE Conference
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    • pp.143-144
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    • 2016
  • The circulating current control within the phase legs is one of the main control objectives in a modular multilevel converter (MMC) under different operating conditions. This paper proposes a control strategy of circulating currents in the MMC under unbalanced voltage by using a proportional-resonant (PR) controller. Under the unbalanced voltage, the circulating currents in the MMC consists of three components such as positive-sequence, negative-sequence, and zero-sequence circulating currents. With the PR controller, all components of the circulating current will be directly controlled in the stationary reference frame without decomposing into positive- and negative-sequence components. Thus, the ripples in the circulating currents and the DC current are suppressed under the unbalanced voltage. The effectiveness of the proposed method is verified by simulation results based on PSCAD/EMTDC simulation program.

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Suggestions for Quality Management through Analysis of Construction Process of Multi-layer Modular Housing (적층식 모듈러주택의 시공 프로세스 분석을 통한 품질관리 중점사항 제안)

  • Sohn, Jeong Rak;Lee, Dong Gun;Bang, Jong Dae;Kim, Jin Won
    • LHI Journal of Land, Housing, and Urban Affairs
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    • v.10 no.3
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    • pp.67-75
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    • 2019
  • The modular construction means that more than 70% of the parts such as walls, windows, electrical wiring, facility piping, bathrooms, and kitchen appliances are pre-assembled at the factory and transported to the site. It is possible to shorten the construction period than general construction work and to secure high quality through modular mass production since the modular construction works in the field at the same time as the modular production. However, there are only four domestic modular manufacturers, and each company's modular components and construction methods are different, so it is necessary to standardize them. Therefore, this study investigated the construction process centering on the stacking method of modular housing construction work applied to D site in Cheonan-si, and proposed the key points of quality management by construction stage. As the project was conducted as a pilot project for government R&D projects, some differences may occur from general modular housing construction. However, the construction process and quality control focus of each unit box type modular house analyzed in this study can be used as basic data in the future of modular housing construction. In addition, the results of this study can be used to establish construction standards, such as the development of checklists and establishment of standard processes.

Modeling of Optical-components Manufacturing System Using Petri-Net (페트리 네트를 이용한 광부품 조립 시스템의 모델링)

  • 김영호;차동국;정승권;배종일;이만형
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.636-639
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    • 2002
  • In the paper, a Visual factory model for a optical-components manufacturing process is built. The optical-components manufacturing process is composed of 3 operation processes; optical sub assembly process, package assembly process, and fiber assembly process. Each process is managed not a batch mode, which is one of most popular manufacturing styles to produce a great deal of industrial output, but though a modular cell. In the processes, a modular cell has to be processed independently of the other cells. Optimization for the composition of assembly cell in the optical-components system is made by the Visual factory model.

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Petri-Nets Modeling and Performance Evaluation of Optical-components Manufacturing System (광 부품 조립 시스템의 모델링과 성능평가)

  • 김영호;김지한;정승권;배종일;이만형
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.491-495
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    • 2002
  • In the paper, a Visual factory model for a optical-components manufacturing process is built. The optical-components manufacturing process is composed of 3 operation processes; optical sub assembly process, package assembly process, and fiber assembly process. Each process is managed not a batch mode, which is one of most popular manufacturing styles to produce a great deal of industrial output, but though a modular cell. In the processes, a modular cell has to be processed independently of the other cells. Optimization for the composition of assembly cell in the optical-components system is made by the Visual factory model.

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Steady-State Performance Analysis of Pressurizer and Helical Steam Generator for SMART

  • Seo, Jae-Kwang;Kang, Hyung-Seok;Kim, Hwan-Yeol;Cho, Bong-Hyun;Lee, Doo-Jeong
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.310-315
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    • 1997
  • System-Integrated Modular Advanced Reactor (SMART), where major primary components such as modular helical steam generator and self regulating pressurizer are integrated into reactor vessel, is currently under development. The pressurizer is designed to control the primary pressure mainly with partial pressure of nitrogen gas and to maintain the fluid temperature as low as possible for the purpose of minimizing steam contribution. The steam generator (SG) is designed to produce super-heated steam inside tube at power operation. Because the in-vessel pressurizer and in-vessel SG are classified as the characteristic components of SMART, it is important to perform a steady state calculation of these components in order to evaluate the adoption of these components. A steady state analysis of the in-vessel pressurizer and in-vessel SG has been performed under normal power operation and the results show an acceptable performance of the components.

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Study on Kinematics and Dynamics of the Modular Robot (모듈러 로봇의 기구학/동력학에 관한 연구)

  • 강희준
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.11
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    • pp.46-53
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    • 2002
  • In order to overcome the conventional robot's physical limitation to frequent changes in operational requirements, it is quite appealing to modularize its system components and allow them to be combined into various configurations to best suit the needs to a particular application. Several researchers have presented the concept of modular robot. In this paper, the kinematics and dynamics of modular robot are studied, which concretes the concept of modular robot. This study includes the selection of individual module, the definition of their parameters and the development of module based manipulate. analysis software package (MBMAP).

Design approach for a FRP structural formwork based steel-free modular bridge system

  • Cheng, Lijuan;Karbhari, Vistasp M.
    • Structural Engineering and Mechanics
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    • v.24 no.5
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    • pp.561-584
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    • 2006
  • The paper presents results of parametric studies, and an overall approach for the design of a modular bridge system which incorporates a steel-reinforcement free concrete slab cast on top of carbon FRP stiffened deck panels which act as both structural formwork and flexural reinforcement, spanning between hollow box type FRP girders. Results of the parametric studies are highlighted to elucidate important relationships between critical configurational parameters and empirical equations based on numerical studies are presented. Results are discussed at the level of the individual deck and girder components, and as a slab-on-girder bridge system. An overall design methodology for the components and bridge system including critical performance checks is also presented.

Development of BIM Based Information Model Interface Module for a Modular Pier (모듈러 교각의 BIM 기반 정보 모델 인터페이스 모듈 개발)

  • Kim, Dong-Wook;Lee, Kwang-Myong;Nam, Sang-Hyeok
    • Journal of KIBIM
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    • v.5 no.1
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    • pp.1-7
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    • 2015
  • Modular technology has become a major issue of the construction industries to enhance their productivity. Modular bridge construction generally requires the data exchange between the contractors, designers, fabricators and constructors. Therefore, a readily accessible information model interface module based on BIM technology is essential for their communication during a project life-cycle. In this study, BIM based information model interface module for a modular pier was developed. For the information models, the PBS(Product Breakdown Structure) and LOD(Level of Development) were defined. Next, all components of a modular pier were conducted by the parametric modeling technique, and then 3D cell library interface was developed. An nterface module was also developed using VBA(Visua basic Application) for exchanging a data from 3D model library to other softwares such as Microstation, AutoCad and Excel and was connected with MS Access database. The developed information model interface module would improve the design quality of the modular pier and reduce the time and cost for design. Updated 3D information models could be utilized for the fabrication, assembly, and construction process for modular piers.

Optimization for the Composition of Assembly Cell in the Optical-Components System

  • Kim, Sok-Ha;Kim, Young-Ho;Seung, Gweon-Jeong;Lee, Man-Hyung;Bea, Jong-Il
    • 제어로봇시스템학회:학술대회논문집
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    • pp.133.4-133
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    • 2001
  • In the paper, a Visual factory model for a optical-components manufacturing process is built. The optical-components manufacturing process is composed of 3 operation processes; optical sub assembly process, package assembly process, and fiber assembly process. Each process is managed not a batch mode, which is one of most popular manufacturing styles to produce a great deal of industrial output, but though a modular cell. In the processes, a modular cell has to be processed independently of the other cells. Optimization for the composition of assembly cell in the optical-components system is made by the Visual factory model.

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