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Roh, Hyung-Gu,Kim, Gun-Hong,Kim, Young-Ho Sage Publications Ltd. 2006 HIGH PERFORMANCE POLYMERS Vol.18 No.5
<P>Zinc oxide nanoparticles were formed by reacting polyamic acid (PAA) with Zn during curing. In this paper, we investigated the effect of curing conditions on the zinc oxide nanoparticle formation. The polyimide (PI) precursors used in this study were biphenyltetracarboxylic dianhydride-<I>p</I>-phenylene diamine (BPDA-PDA) type and oxydiphthalic dianhydride 3-sulful dianhydride (ODPA-3SDA) type PAAs. Zn thin films were deposited on silicon substrates by DC magnetron sputter. PAA was then spin-coated onto Zn thin films and the PAA/metal films were cured at various conditions. The characterization using transmission electron microscope observation was carried out to investigate the size and distribution of zinc oxide particles. Zinc oxide nanoparticles were formed in the PI film regardless of the curing conditions. The size, distribution and density of zinc oxide particles were strongly dependent on the curing conditions..</P>
Engineered-to-order Approach for Providing Flexibility in e-Commerce of Mold Parts
Mun, Duhwan,Jang, Kwangsub,Han, Soonhung,Kim, Junhwan,Hwang, Ho-Jin Sage Publications Ltd. 2007 Concurrent Engineering Vol.15 No.4
<P>In the mold parts industry, customers typically place orders for order-made parts with some changes to the design specifications of ready-made parts within the extent of the manufacturing capability of the supplier. Being customized for ready-made parts, existing e-Catalog systems cannot support this trade pattern. To solve this problem, an engineered-to-order (ETO) approach is proposed here, enabling the trade of order-made parts in an e-Catalog system by utilizing the design and manufacturing knowledge of part suppliers. After addressing technological challenges and their solutions, we describe application results of the ETO approach to two types of mold parts U2014; ejector pins and mold bases.</P>
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>
Choi, SangSu,Jung, Kiwook,Noh, Sang Do Sage Publications Ltd. 2015 Concurrent Engineering Vol.23 No.1
<P>Today, manufacturing industries are trying to improve their competitiveness by combining manufacturing per se with information technology. Virtual reality is being used in product development processes in manufacturing enterprises as a helpful technology to achieve rapid consolidation of information and decision-making through visualization and experience. In this article, 154 articles relevant to virtual reality’s application to manufacturing were surveyed and analyzed. For this, (1) an analysis map was created, based on a virtual reality technology classification and the new product development process; (2) the articles investigated were located on the map; and (3) bibliometric analyses were carried out. Trends in past and present research were examined and future virtual reality research directions and application plans for manufacturing enterprises are discussed.</P>