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서기철(Kichel Seo),손기헌(Gihun Son) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The bubble motion during nucleate boiling in a microchannel is investigated numerically. The<br/> liquid-vapor interface is tracked by a level set method which is modified to include the effects of<br/> phase change at the interface and contact angle at the wall. The computations are made for various<br/> channel sizes, liquid flow rates, and contact angles. Based on the numerical results, the bubble growth<br/> pattern and its effect on the flow and heat transfer are discussed.
자동차부품 기업의 UML기반 자재관리시스템 설계 및 구현
박정혁,서기철,문태수 한국정보시스템학회 2003 情報시스템硏究 Vol.12 No.2
One of the important applications in Enterprise Resource Planning(ERP) systems is the Manufacturing Resource Planning(MRPII) system using Bill of Material(BOM). The manufacturing resource planning determines the quantity and timing of the production or purchase of subassemblies and raw materials needed to support the Master Production Scheduling(MPS). The bill of material is the recipe, a list of the materials needed to make a product. This paper intends to suggest a component-based materials management system using Unified Modeling Language(UML), as an application system for automobile part industry. Applying component based materials management systems designed with UML methodology, we analyzed the workflow and the document on materials management process from production planning to inventory management, and implemented a prototype of efficient materials management system, as a surrogate of existing material requirement planning(MRPI) system. To produce many other assemblies for a automobile part firm, component parts are assembled into subassemblies that are joined to assemble the finished product. Through the system suggested in this study, the level of inventory has cut down and the cost of inventory management has decreased. Also, the development method using UML makes the analysis and design phase to shorten in implementation period of MRPII system. The implementation of materials management system using CBD shows the ease of use in software reuse and the interoperability with corporate internal information system. The result of applying object-oriented CBD technique is to minimize the risk of life cycle and facilitate the reuse of software as mentioned to limitation of information engineering methodology.