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Feature shape complexity: a new criterion for the simplification of feature-based 3D CAD models
Kwon, Soonjo,Mun, Duhwan,Kim, Byung Chul,Han, Soonhung Springer-Verlag 2017 INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TE Vol.88 No.5
<P>Three-dimensional computer-aided design (3D CAD) models with different levels of detail (LOD) are used in various industries for numerous purposes. Therefore, it is necessary to develop techniques to simplify 3D CAD models in order to adjust the LOD of the model according to its purpose. The main purpose of simplification is to minimize the change in the outer shape of the models and to reduce the data size of the models. The key technologies to achieve these purposes are evaluation metrics and simplification operation. Evaluation metrics are employed to select elements to be preserved or removed by calculating the importance of the geometric elements comprising a 3D CAD model. The simplification operation removes the selected elements and fills up the void in the model caused by the removal. Feature volume and type have been the most popular criteria used in evaluation metrics for the simplification of feature-based 3D CAD models. In this study, the concept of feature shape complexity (FSC) is introduced, and a method of adopting FSC as a criterion of evaluation metrics is presented. A prototype system for the simplification of 3D CAD models is then implemented. Finally, the effectiveness of the proposed method is verified by conducting simplification experiments with a complex 3D CAD assembly model.</P>
Kwon, Soonjo,Kim, Byung Chul,Hwang, Hojin,Mun, Duhwan,Han, Soonhung SAGE Publications 2016 Concurrent Engineering Vol.24 No.3
<P>Process plants are designed and constructed by engineering, procurement, and construction companies, which order various types of equipment to be installed in them. Equipment manufacturers design and produce the ordered equipment, and deliver it to the customer. Therefore, equipment information sharing between them is an important issue for engineering collaboration in a plant project. However, they use different three-dimensional computer-aided design systems for different purposes. For this reason, additional three-dimensional computer-aided design and data merging techniques are required for equipment information sharing. This article presents a new approach to share equipment information using three-dimensional computer-aided design simplification and digital catalog techniques. In this approach, the equipment's three-dimensional computer-aided design data generated by a manufacturer are first simplified and then converted into neutral three-dimensional computer-aided design. The converted three-dimensional computer-aided design data are merged with port and specification data into a digital catalog. Equipment information in the form of this digital catalog is finally delivered to the engineering, procurement, and construction companies.</P>
Viable Alternatives to in vivo Tests for Evaluating the Toxicity of Engineered Carbon Nanotubes
Soonjo Kwon,Soo-mi Eo 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.1
Carbon nanotubes (CNTs) stand at the frontier of nanotechnology and are destined to stimulate the next industrial revolution. Rapid increase in their production and use in the technology industry have led to concerns over the effects of CNT on human health and the environment. The prominent use of CNTs in biomedical applications also increases the possibility of human exposure, while properties such as their high aspect ratio (fiber-like shape) and large surface area raise safety concerns for human health if exposure does occur. It is crucial to develop viable alternatives to in vivo tests in order to evaluate the toxicity of engineered CNTs and develop validated experimental models capable of identifying CNTs’ toxic effects and predicting their level of toxicity in the human respiratory system. Human lung epithelial cells serve as a barrier at the interface between the surrounding air and lung tissues in response to exogenous particles such as air-pollutants, including CNTs. Monolayer culture of the key individual cell types has provided abundant fundamental information on the response of these cells to external perturbations. However, such systems are limited by the absence of cell-cell interactions and their dynamic nature, which are both present in vivo. In this review, we suggested two viable alternatives to in vivo tests to evaluate the health risk of human exposure to CNTs.
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.