• Title/Summary/Keyword: Digital simulation

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Research on Ontology-based Task Adaptability Improvement for Digital Human Model (온톨로지 기반 디지털 휴먼모델의 작업 적응성 제고 방안 연구)

  • Kang, Su-Ho;Sohn, My-E
    • Korean Journal of Computational Design and Engineering
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    • v.17 no.2
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    • pp.79-90
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    • 2012
  • In digital virtual manufacturing simulation, Digital Human widely used to optimal workplace design, enhancing worker safety in the workplace, and improving product quality. However, the case of ergonomics simulation solutions to support digital human modeling, Optimal DHM (Digital Human Model) data needed to develop and perform DHM will collect information related to the production process. So simulation developer has burden of collecting information. In this study, to overcome the limitations of existing solutions, we proposed the ADAGIO(Automated Digital humAn model development for General assembly usIng Ontology) framework. The ADAGIO framework was developed for DHM ontology to support optimal deployment of digital virtual environment and in order to ensure consistency of simulation components that are required for simulation modeling was made of a library.

Simulation Modeling Methodology and Simulation Framework for a Construction of a Digital Shipyard (디지털 조선소 구축 및 활용을 위한 모델링 및 시뮬레이션 프레임워크 구축 방법론)

  • Woo, Jong-Hun;Oh, Dae-Kyun;Kwon, Young-Dae;Shin, Jong-Eye;Sur, Joo-No
    • Journal of the Society of Naval Architects of Korea
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    • v.42 no.4 s.142
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    • pp.411-420
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    • 2005
  • World leading company and research centers have invested much cost and effort into a PLM and digital manufacturing field to obtain their own competitiveness. We have been trying to apply a digital manufacturing, especially simulation to ship production process as a part of PLM implementation for a shipyard. A shipbuilding production system and processes have a complexity and a peculiarity different from other kinds of production systems. So, new analysis and modeling methodology is required to implement digital shipyard. which is a digital manufacturing system for a shipbuilding company. This paper suggests an analysis and simulation modeling methodologies for an implementation of a digital shipyard. New methodologies such as a database-merged simulation, a distributed simulation, a modular simulation with a model library and a 3-tire simulation framework are developed.

Mapping Digital Manufacturing Simulation to Synthetic Environment using SEDRIS (SEDRIS를 이용한 디지털 생산 시뮬레이션과 합성 환경 매핑)

  • Moon, Hong-Il;Han, Soon-Hung
    • Journal of the Korea Society for Simulation
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    • v.14 no.2
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    • pp.15-24
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    • 2005
  • The goal of a distributed simulation such as battle field simulation is to combine all kinds of simulations in the same synthetic environment and to make people interact at the same time. It is a key issue to share the same synthetic environment among simulations. To support reusability and affordability in the modeling and simulation area, DMSO(Defense Modeling and Simulation Office) of USA developed concepts such as HLA(High Level Architecture) and SEDRIS (Synthetic Environmental Data Representation and Interchange Specification). In the industrial simulation area, the digital manufacturing is the main stream. To reduce cost and to reuse simulation environment, the standardization becomes the focus of digital manufacturing. This study proposes to use SEDRIS to improve interoperability of manufacturing data. The simulation data of DELMIA, which is a leading commercial digital manufacturing solution, is mapped and translated into the SEDRIS transmittal format. Mapping of the manufacturing simulation data and the synthetic environment are implemented and verified through experiments.

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Examining Portraits in Digital Fashion Art Non-Fungible Tokens (NFTs) through Baudrillard's Simulation

  • Yoon Kyung Lee
    • Journal of the Korean Society of Clothing and Textiles
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    • v.47 no.5
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    • pp.929-942
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    • 2023
  • Web 3.0 enables people and machines to connect, evolve, share, and use knowledge on an unprecedented scale and in new ways, drastically improving our Internet experience. The metaverse is a collective, virtual shared space supporting all digital activities. Prompted by the rapid growth of digital art and digital fashion, this theoretical analysis explores using Jean Baudrillard's simulation concept to create unique digital art non-fungible tokens (NFTs), allowing them to express and communicate ideas like real-world art. Specifically, this study analyzes 120 digital fashion portraits of humans and animals and classifies them under three types of simulacra covering four stages of Baudrillard's simulation process. The result shows that NFT fashion artworks reflect the core features of a digital reality by connecting and transcending the boundaries of cultures, genders, and nationalities. However, in the final simulation stage (the fourth step), the simulacrum can only coexist in the virtual world as a hyperreal object (the Type III of simulacrum): an object more real than reality.

A Study on Modeling Automation of Human Engineering Simulation Using Multi Kinect Depth Cameras (여러 대의 키넥트 뎁스 카메라를 이용한 인간공학 시뮬레이션 모델링 자동화에 관한 연구)

  • Jun, Chanmo;Lee, Ju Yeon;Noh, Sang Do
    • Korean Journal of Computational Design and Engineering
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    • v.21 no.1
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    • pp.9-19
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    • 2016
  • Applying human engineering simulation to analyzing work capability and movements of operators during manufacturing is highly demanded. However, difficulty in modeling digital human required for simulation makes engineers to be reluctant to utilize human simulation for their tasks. This paper addresses such problem on human engineering simulation by developing the technology to automatize human modeling with multiple Kinects at different depths. The Kinects enable us to acquire the movements of digital human which are essential data for implementing human engineering simulation. In this paper, we present a system for modeling automation of digital human. Especially, the system provides a way of generating the digital model of workers' movement and position using multiple Kinects which cannot be generated by single Kinect. Lastly, we verify the effects of the developed system in terms of modeling time and accuracy by applying the system to four different scenarios. In conclusion, the proposed system makes it possible to generate the digital human model easily and reduce costs and time for human engineering simulation.

Digital Manufacturing based Modeling and Simulation of Production Process in Subassembly Lines at a Shipyard (디지털 생산을 기반으로 한 조선 소조립 공정 모델링 및 시뮬레이션)

  • 이광국;신종계;우종훈;최양렬;이장현;김세환
    • Proceedings of the Korea Society for Simulation Conference
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    • 2003.11a
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    • pp.185-192
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    • 2003
  • Digital Manufacturing-based production could be very effective in shipbuilding in order to save costs and time, to increase safety for workers, and to prevent bottleneck processes in advance. Digital shipbuilding system, a simulation-based production tool, is being developed to achieve such aspects in Korea. To simulate material flow in a subassembly line at a shipyard, the product, process and resources was modeled for the subassembly process which consisted of several sub-processes such as tack welding, piece alignment, tack welding, and robot welding processes. The analysis and modeling were carried out by using the UML(Unified Modeling Language), an object-oriented modeling method as well as IDEF(Integration DEFinition), a functional modeling tool. Initially, the characteristics of the shop resources were analyzed using the shipyard data, and the layout of the subassembly line was designed with the resources. The production process modeling of the subassembly lines was performed using the discrete event simulation method. Using the constructed resource and process model, the productivity and efficiency of the line were investigated. The number of workers and the variations In the resource performance such as that of a new welding robot were examined to simulate the changes in productivity. The bottleneck process floated according to the performance of the new resources. The proposed model was viewed three-dimensionally in a digital environment so that interferences among objects and space allocations for the resources could be easily investigated

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Implementation and Applications of Simulation Based Digital Shipyard (시뮬레이션 기반 디지털 조선소 구축 및 활용)

  • Han, Sang-Dong;Ryu, Cheol-Ho;Shin, Jong-Gye;Lee, Jong-Kun
    • Korean Journal of Computational Design and Engineering
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    • v.13 no.1
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    • pp.18-26
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    • 2008
  • Shipbuilding industries have been struggling to reduce production time and cost of their products in many aspects. Manufacturing systems have been changed, new production lines and robots have been installed, and new planning and scheduling systems have been adopted in order to achieve shorter time-to-market and higher productivity. Simulation based manufacturing, digital manufacturing, or virtual manufacturing simulation, whatever the name means, is an approach to achieve such a goal. In order to improve productivity in a shipbuilding process at a shipyard, a digital shipyard development has been driven. This paper proposed how to implement the digital shipyard, what to do with it, and what to obtain from it. This digital shipyard will help simulate and optimize the entire shipbuilding life cycle with its virtual environment through shipbuilding process from the initial development stage to the launch.

A Study for Prevention of Musculoskeletal Disorders Using Digital Human Simulation in the Shipbuilding Industry (Digital Human Simulation을 이용한 근골격계질환 예방에 관한 연구 -조선업을 대상으로-)

  • Chang, Seong-Rok
    • Journal of the Korean Society of Safety
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    • v.22 no.3 s.81
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    • pp.81-87
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    • 2007
  • In this study digital human models of ship construction tasks using modeling & simulation were constructed and human models' activities through human activity analysis were evaluated. Human Factors experts analyzed the actual workers' tasks using the same technique used in human activity analysis at the same time. The main objective of this study is to check a possibility of applying digital human modeling technique to ship construction tasks that are mostly non-standardized(not uniformed) whereas most applications of digital human modeling technique have been applied to standardized tasks. We evaluated postures of both real workers and digital humans by RULA. It turned out that the final scores of RULA evaluation on real workers are the same as the RULA scores for digital humans. However, there were differences of RULA detail scores between real workers and digital humans in the several processes related with the wrist twist and deviations. Those differences are considered to be resulted from the error in the on-site measuring worker's body dimension which could be reduced by accurate tools to correct data for body dimension and digital real drawings for facilities. The results showed possibility of application of digital human modeling and ergonomic analysis on informal work operations as well as formal operations in the shipbuilding industry.

3-D Simulation of T-Shaped Electrode and Comparison of Results with Experiments

  • Shin, Yeong-Kyo;Hwang, Tae-Su;Kang, Seok-Dong;Park, Hun-Gun;Ryu, Jae-Hwa;Kim, Hyun-Chul;Shin, Seong-Won;Lee, Jae-Koo
    • Journal of Information Display
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    • v.3 no.2
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    • pp.13-18
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    • 2002
  • Numerical simulation is one of the most useful tools to study gas discharge phenomena that occur in alternating current plasma display panel (AC-PDP) cell. Most PDP cell simulations have been performed for two-dimensional cell, is cross-section along the address electrode. We developed a three-dimensional PDP simulator and applied it to a T-shaped electrode cell in order to show the effects of sustain electrode shape that cannot be included in two-dimensional simulation. The dependence of power consumption on electrode shape and area in the simulation showed the same trend as experiment.

A framework of Plant Simulation for a Construction of a Digital Shipyard (디지털 조선소 구축을 위한 물류 모델 프레임워크)

  • Woo, Jong-Hun;Lee, Kwang-Kook;Jung, Ho-Rim;Kwon, Young-Dae;Shin, Jong-Gye
    • Journal of the Society of Naval Architects of Korea
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    • v.42 no.2 s.140
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    • pp.165-174
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    • 2005
  • Recently, world leading companies on manufacturing field are trying to adopt a PLM methodology, which is a new production paradigm, for a survival and strengthening the competitiveness. Some projects for a digital shipyard including a methodology of a digital simulation framework are going on by Seoul national university and Samsung heavy industry. A Database methodology for a scheduling data, an interfacing methodology for a simulation input and output, and a synchronized simulation related methodology are required for enhancing the value of the digital simulation for shipbuilding. In this paper, such a methodologies and a related case study for a fabrication factory and an assembly factory are presented.