• 인터넷정보학회논문지
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• 제3권2호
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• pp.39-56
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• 2002

데이터베이스를 사용하여 분산된 환경에서 많은 응용이 구축되어감에 따라 지역 데이터베이스의 자치성은 유지하면서 데이터베이스들을 상호 공유하는 데이터웨어하우징, 데이터마이닝 등의 응용이 많이 늘고 있다. 이러한 응용의 첫 번째 요구사항은 이질의 데이터베이스 스키마 통합이다. 기존의 데이터베이스 스키마 통합은 통합을 위한 스키마 공통 모델의 부재, 스키마 통합 프로그램의 복잡성으로 어려움을 겪어 왔다. 본 연구는 XML Schema를 데이터베이스 스키마 통합을 위한 공통된 데이터모델로 사용하여 데이터 모델을 표준화하고, 스키마 통합을 위한 연산들을 정의하여 이를 XSLT로 대응시킴으로써 스키마 통합 자동화 프로그래밍의 복잡성을 해결하며, 스키마 충돌 유형에 따라 통합하는 방법을 제시하였다. 제시된 방법은 기존의 통합 모델에 비하여 표준화, 확장성 등의 장점을 갖는다.

• 경영과정보연구
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• 제1권
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• pp.413-443
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• 1997

In today's hospital-management, information system and the information by it will be a necessary administrative materials of organization with man-power, funds, equipment and resources. This study is for figuring out steps to utilize information-system, an important strategy to grow the hospital applying to the change of surroundings, improving the service for patients, accelerating medical examination, improving it in quality and suggesting a basis be able to manage it effectively by putting information system in practice such as economic effect by shorting time and the effect of medical study by computerizing clinical data. And the result of it is as follows: From the Nolan's 6 step - model about the degree using information system in hospital-management, the 1st group of hospital-size came to 1st and 2nd step, the 2nd group to the 3rd and 4th step and the 3rd group to the 5th and 6th step, which correspond to the survey- results that information system increases with the size of the hospital to propagation, regulation and integration step and that the number of the hospital developing to the step managing information is increasing.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 동계학술발표대회 논문집
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• pp.526-532
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• 2005

Representation of product data for exchanging and sharing a plant information was established the International Standard by ISO 10303 (STEP) and ISO 15926, but is not used widely in industrial circles by massiveness of standard and complexity of plant itself Specially, they are embodied to STEP data file(ISO 10303 Parts 21), but STEP file is uncomfortable that a person recognizes, and needs specification creation tool. In this paper, we made the integration schema for control valve through related standards, Also, we suggest the practical use framework for electronic commerce to utilize the XML schema that can represents integrate schema of control valve to use XML that is becoming the latest issue.

• 한국CDE학회논문집
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• 제10권6호
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• pp.412-420
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• 2005

The integration of CAD and CAM is critical for computer aided process planning. Recently, STEP has been emerged and utilized as a product data exchange standard format in CAD/CAM areas. The assembly information consists of assembly component relations, assembly features, assembly directions and mating conditions. The purpose of this study is to develop an efficient algorithm to extract assembly information directly from the STEP based files and to generate automatically assembly process plan from the extracted assembly features. The developed algorithms will generate assembly information codes for STEP(AICS). The results from this study can be a reasonable link between design and manufacturing for developing better CAAPP(Computer-Aided Assembly Process Planning) systems.

• Structural Engineering and Mechanics
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• 제60권5호
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• pp.891-902
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• 2016

The beam structure with breathing cracks subjected to harmonic excitations was modeled by FEM based on Euler-Bernoulli theory, and a piecewise dynamical system was deduced. The precise integration method (PIM) was employed to propose an algorithm for analyzing the dynamic responses of the deduced system. This system was first divided into linear sub-systems, between which there are switching points resulted from the breathing cracks. The inhomogeneous terms due to the external excitations were tackled by introducing auxiliary variables to express the harmonic functions, hence the sub-systems are homogeneous. The PIM was then applied to solve the homogeneous sub-systems one by one. During the procedures, a predictor-corrector algorithm was presented to determine the switching points accurately. The presented method can provide solutions with an accuracy to a magnitude of $10^{-12}$ compared with exact solutions obtained by the theories of ordinary differential equations. The PIM results are much more accurate than Newmark ones with the same time step. Moreover, it is found that the PIM can maintain a high level of accuracy even when the time step increases within a relatively wide range.

• 정보처리학회논문지D
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• 제11D권3호
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• pp.553-562
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• 2004

본 논문에서는 데이터베이스 설계시 중요한 과정인 개념설계 단계에서 개체관계도(Entity Relationship Diagram)의 정보를 저장하는 ERD시소러스(Thesaurus)를 구축하고, 이러한 ERD시소러스를 기반으로 하는 뷰 통합 방법론을 제시하고자 한다. 제시된 방법론의 유용성을 입증하기 위하여, 적용사례에 대한 뷰 통합지원시스템의 프로토타입을 구축하였다. 적용결과, ERD시소러스 기반의 방법론이 기존의 뷰 통합 방법론보다 친밀도 분석, 의미충돌 해결, 유 통합과정에서 더 효과적임을 확인할 수 있었다. 따라서 이 방법론이 기존의 단편화된 스키마의 통합이나 대규모 데이터베이스 통합 설계시 유용하게 활용될 수 있을 것으로 기대된다.

• 한국정밀공학회지
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• 제16권12호
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• pp.109-118
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• 1999

The objective of this research is to develop an effective inspection planning strategy for sculpture surfaces in OMM(On-Machine Measurement) process. As a first step, effective measuring point locations are determined to obtain optimum results for given sampling numbers. Two measuring point selection methods are suggested in this study based on newly proposed CAD/CAM/CAI integration concept: (1) by the prediction of cutting errors, (2) by considering cutter contact points to avoid the measurement errors caused by cusps. As a next step, the TSP(Traveling Salesman Problem)algorithm is applied to minimize the probe moving distance. Appropriate simulations and experiments are performed to verify the proposed inspection planning strategy in this study, and the results are analyzed.

• Structural Engineering and Mechanics
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• 제67권6호
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• pp.603-616
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• 2018

In this study, the acceleration vector in each time step is assumed to be a mth order time polynomial. By using the initial conditions, satisfying the equation of motion at both ends of the time step and minimizing the square of the residual vector, the m+3 unknown coefficients are determined. The order of accuracy for this approach is m+1, and it has a very low dispersion error. Moreover, the period error of the new technique is almost zero, and it is considerably smaller than the members of the Newmark method. The proposed scheme has an appropriate domain of stability, which is greater than that of the central difference and linear acceleration techniques. The numerical tests highlight the improved performance of the new algorithm over the fourth-order Runge-Kutta, central difference, linear and average acceleration methods.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2004년도 가을 학술발표회 논문집
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• pp.19-26
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• 2004

This study constructs the reduced system by two-level condensation scheme. This scheme consists of two steps. First step selects the candidate area for the primary degrees of freedom by energy estimation in element level. In the second step, the primary degrees of freedom are selected by the sequential elimination scheme. The efficiency and reliability of this scheme is shown through the prediction of eigenvalues of a few numerical examples. Time integration in the reduced system can save the computing time effectively. The well-constructed reduced system can present the accurate behavior of the structure under arbitrary dynamic loads so much as the global system. Through the numerical example, the efficiency and reliability of the proposed scheme will be demonstrated.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.414-417
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• 2001

In today's engineering world, any product development activity requires the expertise and the interaction of many different engineering. Therefore the various activities in a product development architecture are highly distributed and interdependent. The interdependence may be due to sharing of databases and transfer of information between various activities. This will require an integrated product model. That can support distributed design such that participants from different backgrounds collaborate towards one common goal. This paper presents the architecture of the product modeling system for the integration of CAD and CAE. It then reports on the study of STEP 10303 and UG open API focused on the integration of different technical environments.