• 한국정밀공학회지
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• 제15권2호
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• pp.68-74
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• 1998

In this work, we have been concerned with developing an intelligent mold design system for plastic injection molding on the AutoCAD. We have concentrated on building a viable environment, including a mold parts database and a menu-driven user interface. This provides a more interactive and interface for selection of optimal mold-base and mold parts in mold design system. This work presents a method which allows the designer to select the mold parts and mold-base directly within an AutoCAD environment. It can also automatically generate detailed 3D drawings of the mold parts and mold-base. The system shows its potential capability for future enhancement. Since the system is independent of the data, it could easily be extended to other mold-bases and mold parts. In addition, it can be linked to the molding analysis system by creating subtracted 3-D models.

• 한국CDE학회논문집
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• 제2권2호
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• pp.93-102
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• 1997

Most design changes are due to interferences and fit-up as parts are assembled if such a large product as an automobile or an aircraft is developed by many concurrent engineers. In this part (1) of the thesis, the assembly-centric modeling methodology with CAD systems is proposed in order to reduce the design changes. Unlike part-centric modeling method, a part is modeled with its own coordinate system which is used in downstream process as machining and measuring. The part coordinates initially have the same orientation as its assembly which is predefined in BOM (Bill of Material). Then, the corrdinates origin of the part is moved to its location to be assembled from that of its assembly coordinate system. To implement this methodology, the position data of the part w.r.t. its assembly are stored in a database to build the same hierarchical assembling structure as BOM structure. This modeling approach has the advantage of reflecting asembling sequence, because the process of positioning parts is similar to that of real assembling. And with the method, a designer can easily adjust all of the part positions of an assembly to resolve interferences if he modifies just the coordinates origin of the assembly, which results in moving included parts and assemblies together.

• Industrial Engineering and Management Systems
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• 제9권3호
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• pp.215-226
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• 2010

Since product design strongly depends on the experience and ability of the designers, and a long lead time is required for the product design stage, introducing a support system related to this experience and ability is an effective technique to reduce the lead time. In this paper, an information system is developed to support the development of engineering mechanisms with the evaluation of the assembly process on the basis of the abstract functions required for new products. The developed system is based on a database system involving the following data structure: (1) a hierarchical structure related to information about the product functions, (2) the relationship between the parts and engineering functions and/or mechanisms of products, and (3) the relationship between the parts and manufacturing characteristics. The system stores the relationships between the product functions, structure of parts, and assembly characteristics. This information can then be interactively retrieved using the data structure described in (1), (2), and (3). A procedure for designing new products is proposed that involves using the information about existing products. This paper presents the characteristics of the proposed procedure and the developed information system. In addition, a case study of the redesign of a simple structured robot by using the proposed procedure is discussed.

• Nuclear Engineering and Technology
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• 제53권4호
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• pp.1199-1209
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• 2021

The detection of unexpected loose parts in the primary coolant system in a nuclear power plant remains an extremely important issue. It is essential to develop a methodology for the localization and mass estimation of loose parts owing to the high prediction error of conventional methods. An effective approach is presented for the localization and mass estimation of a loose part using machine-learning and deep-learning algorithms. First, a methodology was developed to estimate both the impact location and the mass of a loose part at the same times in a real structure in which geometric changes exist. Second, an impact database was constructed through a series of impact finite-element analyses (FEAs). Then, impact parameter prediction modes were generated for localization and mass estimation of a simulated metallic loose part using machine-learning algorithms (artificial neural network, Gaussian process, and support vector machine) and a deep-learning algorithm (convolutional neural network). The usefulness of the methodology was validated through blind tests, and the noise effect of the training data was also investigated. The high performance obtained in this study shows that the proposed methodology using an FEA-based database and deep learning is useful for localization and mass estimation of loose parts on site.

• 한국정보과학회논문지:데이타베이스
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• 제30권5호
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• pp.540-551
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• 2003

최근에 데이타베이스에 저장된 XML문서의 변경에 대한 여러 연구들이 수행되었다[1-3］. 이 연구들은 우선 변경 연산들을 정의하고 이 연산들을 수행할 때 발생하는 의미적 문제들을 해결하는 방법을 제안하였다. 이러한 연구들에서는 변경 연산을 수행한 후에 검증을 수행하기 때문에 여러 가지 충돌 문제가 발생한다. 이러한 충돌문제를 해결하기 위해서는 XML데이타베이스 시스템이 변경 연산을 수행하기 전에 이 연산이 DTD에 따르는지 즉시 검증할 수 있어야 한다. 또한 지금까지의 연구들은 변경된 XML문서를 검증할 때 변경된 부분을 검증하지 않고 문서 전체를 검증한다. 따라서 많은 응용프로그램들이 XML문서를 변경한다면 이 연산에 대한 검증 과정 때문에 심각한 성능 저하를 가져올 것이다. 이 연구에서는 이 두 가지 문제점을 해결하기 위한 방법을 제안한다. 우선 DTD정보를 추출하여 데이타베이스에 저장하고 데이타베이스에 저장된 XML문서를 변경할 때 이 저장된 DTD정보를 이용하여 변경 연산의 유효성을 검증함으로써 항상 유효한 XML문서를 데이타베이스에 유지하도록 한다. 이를 위해 유효성 검증을 변경 연산이 수행되기 전에 즉시 수행하고 검증 범위 또한 변경된 부분으로 한정시키는 메카니즘을 고안하였다.

• 품질경영학회지
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• 제48권4호
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• pp.567-580
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• 2020

Purpose: The purpose of this study is to present a preferred parts list, establish a search tool for common parts, and propose a development plan for parts management. Methods: When selecting the preferred parts list, the weight of the selection of the military parts and the online site of the civilian parts were taken into account. By establishing a database of selected preferred parts list, we have established a system for searching common parts. Results: The results of this study are as follows; In order to establish parts management work in Korea's defense, it is necessary to improve the Defense Acquisition Program Act, Enforcement Decree (Rules), and the Regulations for Defense Acquisition Program Administration. Development of performance indicators for parts management is required, and establishment of procedures and standards for selection of preferred parts lists is required. Considerations for the selection of preferred parts list include whether they are used a lot in civilian products, whether they are used a lot, whether they are certified suppliers, whether they are national and industrial standard products, whether they perform well considering reliability, durability, and quality, and whether they can be supplied continuously. Conclusion: It is necessary to establish policies and systems related to parts management and to establish criteria for selecting preferred parts list for the development of domestic parts management tasks.

• 한국정보통신학회논문지
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• 제8권8호
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• pp.1851-1858
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• 2004

본 논문에서는 기계부품 생산라인에 전용으로 적용할 XML 기반 생산관리시스템을 개발하였다. 기계부품 전용 생산관리시스템 개발을 위해 여러 관리모듈들을 개발, 통합하고 아울러 XML 기술에 기반 한 생산관리시스템을 개발하였다. 그리고 클라이언트/서버 데이터베이스 모듈을 구축하여 기계부품 제어를 위한 서브시스템과 서버 데이터베이스와의 통신을 지원하는 GUI 응용 프로그램도 개발하였으며 RPC 에뮬레이터를 이용하여 클라이언트 GUI 모듈에서 서버 모듈을 원격 실행하도록 하였다. 통합제어모듈을 통하여 독립적으로 실행되는 각 모듈들을 통합하여 하나의 큰 유기적 생산관리시스템으로 동작하도록 제어한다. 아울러 POP 시스템을 개발하여 기계부품 가공 기계에 부착된 센서의 시리얼포트를 통하여 실적 데이터를 수집하여 이를 GUI로 나타내고 분석하여 생산계획에 즉시 반영하는 기계부품 실적 정보 시스템을 구축하며 또한 XML 기술을 이용하여 XML 기반 생산관리시스템을 구축하였다.

• 한국실내디자인학회논문집
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• 제31호
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• pp.71-78
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• 2002

Understanding the consumer changed life styles are integrated, mutual complement for user's worth and consciousness, the life of consumption, etc. Recently, Apartment Model House has built for distribute to Apartment house When they enter the units after 2 or 3 years. So, Interior designer make an inference from the changed life styles. But, We don't have enough information to trace the design trend about residential space design. Design database is correspond with interior space and structured entity relationship. There are three parts in this Database, Type, Elements and Relation information. Type are composed size, ages, style, and space, Elements are materials and space elements. Relation information are publishing, designer, exhibition, construction company, remodeling, Intoner design and User favorite styles are the development in web environment. This research supplies interior design information for Web environment and trend analysis supports collaboration with development of interior design information database.

• 수산경영론집
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• 제29권2호
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• pp.65-76
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• 1998

This paper tries to suggest the Model of Fisheries Information Systems(FIS) with information technology. The paper shows the analysis and design of FIS. FIS consists of three inportant parts. They are database system, modelbase system and networking. Database systems report to infer the statistic, institute, maket of fisheries. Modelbase systems are used to forecast and plan the automation of fisheries. Networking is needed to develop the Value-Added Networking(VAN). FIS will be highly possible to develop the biggest VAN in Korea.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.358-364
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• 2004

The standardization of the urban transit maintenance system consists of BOM System, maintenance parts code system, and accident/trouble code system standardization. This paper is described only the result of BOM System, maintenance parts code system, and accident/trouble code system standardization. The results of standardization are using urban transit maintenance IT system and apply Expert System, RAMS System, and DATABASE contents of various kinds.