• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.11
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• pp.1760-1767
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• 2004

Sequential sampling approaches of a metamodel that sampling points are updated sequentially become a significant consideration in metamodeling technique. Sequential sampling design is more effective than classical space filling design of all-at-once sampling because sequential sampling design is to add new sampling points by means of distance between sampling points or precdiction error obtained from metamodel. However, though the extremum points can strongly reflect the behaviors of responses, the existing sequential sampling designs are inefficient to approximate extremum points of original model. In this research, new sequential sampling approach using the sensitivity of Kriging model is proposed, so that new approach reflects the behaviors of response sequentially. Various sequential sampling designs are reviewed and the performances of the proposed approach are compared with those of existing sequential sampling approaches by using mean squared error. The accuracy of the proposed approach is investigated against optimization results of test problems so that superiority of the sensitivity approach is verified.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.5763-5768
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• 2015

A relief valve is a mechanical element to keep safety by controlling high pressure. Usually, the high pressure is relieved by using the spring force and letting the fluid to flow from another way out of system. When its normal pressure is reached, the relief valve can return to initial state. The relief valve should be designed for smooth operation and should satisfy the structural safety requirement under operating condition. The commercial software ANSYS/WORKBENCH is utilized for flow and structural analysis. Very high pressure may cause structural problem due to severe stress. The study suggests the design satisfying the structural design requirement

• Journal of KIISE:Software and Applications
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• v.34 no.4
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• pp.328-341
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• 2007

When the decision to initiate a software product line has been taken, the first step is the domain analysis describing the variability in the requirements, the second important step is the definition of a domain architecture that captures the overall structure of a series of closely related products. A domain architecture can be a core asset in product line by describing the commonalities and variabilities of the products contained in the software product line. The variabilities, which are identified at each phase of the core assets development, are diverse in the level of abstraction. Therefore, it is important to clearly define, systematically identify, and explicitly represent variability at the architectural level. However, it is difficult to identify and represent the variability which should be considered at the architecture level, because these may be appeared in architecture elements and in architecture configuration. In this paper, we suggest a method of developing domain architecture as a core asset in product line where commonality and variability are explicitly considered. First of all, we will describe a domain architecture metamodel that can explicitly define commonality and variability concepts by extending the Object Management Group's ($OMG^{TM}$ Reusable Asset Specification eRAS) model. Using the domain architecture metamodel, architecture elements are defined and the variations that can be identified at the architecture level are classified into two types in according th abstract level. Additionally, we describe a domain architecture where commonality and variability are explicitly considered on basis of this metamodel.

• Journal of Korean Society for Quality Management
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• v.38 no.1
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• pp.64-74
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• 2010

Since management of information resources is getting more complicated in the distributed, heterogeneous computing environment, the capability of monitoring and controlling the dispersed information resources is perceived as a critical success factor for the effective enterprise-wide information resource management. Integrated Control Architecture(ICA) provides that capability. Utilizing such architecture, we can manage corporate information resources more efficiently, perform impact analysis for changes in information resources, and alleviate the human effort by automating the monitoring of critical information resources. In this paper, we propose a conceptual framework and metamodel of ICA.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.115-117
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• 2003

2001년 OMG는 그 동안의 모델링 관련 표준화 작업의 성과를 바탕으로 모델 중심의 개발 방법인 MDA를 표준으로 정하였다. MDA의 핵심은 잘 정의된 비즈니스 독립적인 모델을 플랫폼 종속적인 모델로 자동 변환하고 그 변환된 모델을 통해서 코드를 자동 생성함으로써 소프트웨어의 생산성을 높이고 플랫폼 변화에 능동적으로 대처 할 수 있다는 것이다. 본 논문에서는 코드 생성을 위해서 플랫폼 종속적 모델의 기술 방법인 UML Profile에 코드 관련 정보를 UML을 통해서 정의할 수 있도록 하는 코드 생성 정보 메타 모델을 제시한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1992.04b
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• pp.503-511
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• 1992

현존하는 대부분의 메타 시스템들은 개체-관계 모형을 기반으로 한 메타모형을 갖는다. 그러나 개체-관계 모형을 기반으로 하는 메타모형은 정보시스템 개발환경에 대한 정보를 충분히 표현하기에 부족하며 유추능력에 있어서도 한계성을 가지고 있다. 본 논문에서는 이러한 단점들을 극복하기 위해 확장된 메타모형이 제시되었다. 새로운 메타모형에서는 정보를 충분히 반영하기 위하여 객체지향적 데이타모형을 기반으로 하며 유추능력을 향상시키기 위하여 논리를 도입하였다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1996.10a
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• pp.147-150
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• 1996

A homing torpedo's performance can be expressed a function of many variables, i.e. technical and tactical variables. When designing a homing torpedo, these variables have to be decided upon. The system effectiveness of a homing torpedo can be determined by analyzing of these variables. This paper describes a procedure of simulation metamodelling using a Factor Analysis methodology. A simulation model was used in order to obtain the data base for analyzing detection probability of torpedo. By analyzing the main and interaction effects these variables on the analysis of detection probability, we will show the importance of certain variables, of a homing torpedo.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2007.02a
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• pp.72-79
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• 2007

OMG's Common Warehouse Metamodel is now a single data warehouse metadata standard. Interchange of metadata between data warehousing tools and metadata repositories made easy and convenient by using CWM. In this paper, we present the origin, importance and architecture of CWM, and offer an application case.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.361-364
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• 2004

소프트웨어 개발 프로젝트의 특성을 고려한 프로세스의 테일러링은 고품질 소프트웨어 개발에 기본적인 요건이다. 테일러링을 유연하게 하기 위해서는 프로세스 구성 변화에 대한 영향이 지역화 되도록 프로세스 구성요소가 모듈화되어야 한다. 본 논문에서는 프로세스 모델을 모듈화된 요소기반으로 정의하기 위한 메타모델을 정의한다. 또한 정의된 메타모델을 기반으로 모듈화된 프로세스 모델의 예를 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10b
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• pp.289-291
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• 2003

MDA는 시스템을 구현 플랫폼 및 구현 기술과 독립적으로 설계할 수 있도록 지원하고, 설계된 모델을 다양한 플랫폼으로 매핑할 수 있도록 하여 재사용 및 통합을 용이하게 한다. 하지만, 플랫폼에 독립적으로 설계된 모델을 다양한 플랫폼에 매핑하려면, 해당 플랫폼에 종속적인 모델로 매핑하여야 하고, 추가적으로 생성해야 하는 모델 정보를 파악하여 코드와 일대일 매핑될 수 있도록 하여야 한다. 본 논문은 플랫폼에 독립적인 설계모델을 플랫폼에 맞게 변환하기 위하여 MOF(Meta-Object Facility)에 기반하여 매핑규칙을 정의할 수 있도록 변환 메타모델을 정의하고 이를 EJB 도메인에 적용해본다.