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A review of smart manufacturing reference models based on the skeleton meta-model
Soonhung Han 한국CDE학회 2020 Journal of computational design and engineering Vol.7 No.3
Standards will allow interoperability among stakeholders in the upcoming super-connected world. A smart manufacturing reference model (SMRM) is under development inside JWG21 between ISO and IEC. Based on a dimensionality analysis and the skeleton meta-model, the eight proposed SMRMs are reviewed and compared. The SMRMs are classified according to the number of lifecycle axes and the number of dimensional axes. Also, how the concept of a digital twin can be accommodated in an SMRM is investigated.
Interoperability of product and manufacturing information using ontology
Ahmed, Fahim,Han, Soonhung Sage Publications Ltd. 2015 Concurrent Engineering Vol.23 No.3
<P>The communication among different computer-aided design/computer-aided manufacturing/analysis systems usually involves huge amount of information and heterogeneous data formats. Inefficient communication between computer-aided design and computer-aided design/computer-aided manufacturing/analysis systems leads to information loss, which will lead to design and fabrication errors. Therefore, a bridge is needed to be made between the systems so that models can be transported easily and efficiently from the computer-aided design system to another system. To carry out successful manufacturing operation, not only parametric information and machining information but also non-parametric information is needed to be transported. The non-parametric information are geometric dimensioning and tolerance, notes, and other annotation to three-dimensional models which, altogether, are regarded as product and manufacturing information. Exchange of product and manufacturing information is to be done not only syntactically but also semantically. It is necessary to identify ontology and semantics early in the process so that the system is able to view, understand, and define the concepts relating to parametric and non-parametric information to improve interoperability and overcome data sharing problems. Neutral formats such as STEP, Initial Graphics Exchange Specifications, or prominent interoperability-related research works offer integration of other systems with computer-aided design. However, exchange of non-parametric information or product and manufacturing information has not been considered in these research works. To achieve semantic integration of information between computer-aided design and computer-aided design/computer-aided manufacturing/analysis systems, this article proposes a data integration method for both—parametric information of a model and non-parametric information (product and manufacturing information)—by constructing a neutral platform using OWL ontology, and also shows a pilot implementation that verifies interoperability between commercial computer-aided design and computer-aided design/computer-aided manufacturing/analysis systems.</P>
항공사진과 수치지도를 이용한 도시 건물의 이미지 기반 모델링
유병현,한순흥 한국지리정보학회 2005 한국지리정보학회지 Vol.8 No.1
비행 시뮬레이션과 같은 가상현실 시스템은 실제 존재하는 도시의 가상환경을 필요로 하며, 항상 변화하고 있는 도시환경과 치대한 일치하는 도시모델을 유지하여야 한다. 따라서 주기적으로 갱신되는 지형공간정보를 활용할 수 있는 도시 모델링 방법이 필요하다. 또한 비행 시뮬레이션은 가까운 지역뿐만이 아니라 먼 거리의 건물을 효과적으로 표현할 수 있어야 한다. 이를 위하여 본 논문에서는 고해상도 항공사진과 수지지도로부터, 가상 도시환경을 비교적 적은 노력으로 모델링할 수 있는 방법을 제시한다. 이미지 운반의 모델링 기법을 아파트처럼 단순한 구조의 건물이 많은 한국의 도시환경과 지형공간정보의 특성에 맞도록 적용하여, 수많은 건물을 폴리곤으로 모델링하지 않고 효율적으로 표현할 수 있도록 한다. 세안하는 방법은 지형공간정보의 전처리 과정과 가상 도시환경 모델링 과정으로 구성되며, 건물의 높이 맵을 만드는 간단한 전처리 과정만으로 가상도시환경을 모델링 할 수 있어, 기존의 폴리곤 기반의 모델링 방법이 대규모 도시 가상환경에서 멀리 있는 수많은 건물의 표현을 생략하였던 문제점을 개선하였다. The VR (virtual reality) simulator such as helicopter simulation needs virtual environment of existing urban area. But the real urban environment keeps changing. We need a modeling method to make use of the GIS data that are updated periodically. The flight simulation needs to visualize not only buildings in near distance but also a large number of buildings in the far distance. We propose a method for modeling urban environment from aerial image and digital map with a comparatively small manual work. Image based modeling is applied to urban model which considers the characteristic of Korean cities. Buildings in the distance can be presented without creating a lot of polygons. Proposed method consists of the pre-processing stage which prepares the model from the GIS data and the modeling stage which makes the virtual urban environment. The virtual urban environment can be modeled with the simple process which utilizes the height map of buildings.
Soonjo Kwon,Soonhung Han,Duhwan Mun (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
In ship outfitting and offshore plant design phase, the construction of an equipment catalog is necessary. Equipment 3D CAD data adopt different level of detail (LOD) depending on its purpose. Equipment supplier’s CAD data have high complexity whereas shipyard’s CAD data have low complexity. Therefore, an automation tool supporting the simplification of equipment 3D CAD data is necessary. In this paper, the simplification criteria and quantitative metric for 3D CAD assembly data are proposed. The prototype system was developed, and verified through experiment with test cases.