• 시스템엔지니어링학술지
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• 제19권1호
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• pp.44-55
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• 2023

The defense M&S system, which has been classified as a weapon system between requirements determination and project implementation, is being developed by applying the weapon system development procedure of the Defense Acquisition Program Administration. The M&S system abstracts and models the real world to suit the intended use and proceeds with the process of developing it as a software-oriented system. Overseas, the conceptual model development stage is staged before entering the design stage after the requirements analysis. In addition, each step includes verification and validation processes. In Korea, while establishing and applying the weapon system development procedure based on the SE process, the M&S system is also applied in the same way as the general weapon system, limiting appropriate development outputs and verification and validation. In this study, the system development procedure of the M&S system is established and presented based on the relevant standards and SE process of developed countries.

• 전기전자학회논문지
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• 제23권1호
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• pp.214-223
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• 2019

본 논문은 재난통신 시스템을 실제적으로 활용하기 위해 반드시 필요한 표준운영절차(SOP)를 개발하기 위한 방법론과 전략들을 제시하고자 한다. 따라서 재난안전통신망의 SOP와 연계되는 다양한 요소들을 규명하고 특성을 분석하였고, 이를 기반으로 SOP의 효과적인 개발을 위한 프로세스와 전략을 개발하여 제시하였다. 아울러 개발되는 SOP를 재난안전통신망 구현 기술인 LTE에 반영하여 무선자원 할당의 토대가 되는 우선순위와 QoS가 어떻게 운영되어야 하는지도 제시하였다.

• Journal of Mechanical Science and Technology
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• 제18권6호
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• pp.1010-1018
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• 2004

This study presents the methodological aspects of combustion instability modeling and provides the numerical results of the model (sub-scale) combustion chamber, regarding geometrical dimensions and operating conditions, which are for determining the combustion stability boundaries using the model chamber. An approach to determine the stability limits and acoustic characteristics of injectors is described intensively. Procedures for extrapolation of the model operating parameters to the actual conditions are presented, which allow the hot-fire test data to be presented by parameters of the combustion chamber pressure and mixture (oxidizer/fuel) ratio, which are customary for designers. Tests with the model chamber, based on the suggested scaling method, are far more cost-effective than with the actual (full-scale) chamber and useful for injector screening at the initial stage of the combustor development in a viewpoint of combustion instabilities.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.2101-2107
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• 2008

This study has proposed the development procedure of 'railway accident risk assessment model' by as a common approach. The risk assessment procedure is following the requirements of the common safety methods (CSM) suggested in EU and was developed based on the accident scenarios. Various hazardous events, which have the potential to lead directly to casualties, were defined. Then, for each hazardous event, the railway accident appearance scenarios and railway accident progress scenarios were developed. The developed procedure will provide a generic model of the safety risk on the Korea railway.

• International Journal of Internet, Broadcasting and Communication
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• 제14권1호
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• pp.170-181
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• 2022

We live in a digital age. Smartphones are used by everyone from children to the elderly. And many smart devices are pouring out and changing our daily life a lot. However, even in the development of this digital age, there are some marginalized groups. There are also those who are reluctant to expose their information in the digital age. They have difficulty making reservations on their smartphones, using payment systems, logging into the site using various authentication and verification procedures, and entering and leaving buildings. We still carry most IDs, seals, certificates, etc. in physical form. Those who use smartphones are enjoying the convenience of the times. However, among the underprivileged, the desire to pass everything with only one device is growing. In this study, the most suitable smart band model was proposed by collecting the Delphi survey and the opinions of the general public. Future research is required to improve practical usability and utility by developing cheaper and more convenient models.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 1990년도 수공학논총 제32권
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• pp.19-19
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• 1990

도시화한 소유역에서 배수조직의 물리적 특성 변화에 의한 유출현상과 침수상황을 정기적으로 평가할 수 있는 도시유역에서의 유출해석모형(URAM)을 개발하여 시험유역에서의 실측치와 본 모형을 이용한 모의발생치를 비교하여 모형을 검증한 후 실유역에 적용하여 응용성을 평가하였다. URAM을 이용 시험유역의 유출현상을 모의발생한 결과 실측치와 잘 일치함을 보여주었으며 또한 상습침수지역에 대하여 침수현상을 모의발생시킨 결과 계산된 침수특성은 실제 현황과 정상적으로 잘 일치하여 본 모형은 도시소유역 유출해석에 이용가치가 높은 것으로 판단되었다.

• 물과 미래
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• 제23권3호
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• pp.329-340
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• 1990

도시화한 소유역에서 배수조직의 물리적 특성 변화에 의한 유출현상과 침수상황을 정성적으로 평가할 수 있는 도시유역에서의 유출해석모형(URAM)을 개발하여 시험유역에서의 실측치와 본 모형을 이용한 모의발생치를 비교하여 모형을 검증한 후 실유역에 적용하여 응용성을 평가하였다. URAM을 이용 시험유역의 유출현상을 모의발생한 결과 실측치와 잘 일치함을 보여 주었으며, 또한 상습침수지역에 대하여 침수현상을 모의발생시킨 결과 계산된 침수특성은 실제 현황과 정성적으로 잘 일치하여 본 모형은 도시소유역 유출해석에 이용가치가 높은 것으로 판단되었다.

• 한국수자원학회논문집
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• 제36권1호
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• pp.75-85
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• 2003

시가지의 확장과 개발 등으로 인한 도시에서의 강우-유출현상은 자연하천유역에 비하여 더욱 복잡한 양상을 가지며, 실제 유역의 변화로 인하여 모형의 적용이 매우 어려운 편이다. 본 연구에서는 SW 모형과 전문가 시스템을 적용하여 도시화 유역에서의 유출 특성을 파악하였다. 연구 유역으로는 대전광역시에서 노은지역을 선정하였으며, 실제 유역 및 시설자료, 강우, 유출자료와 다양한 강우강도식을 사용하였다. 매개변수의 추정 과정을 위하여 전문가시스템을 사용하였으며, 본 결과들을 통하여 설계 강우의 시간 분포 및 도시화에 따른 도시 유역의 반응 경향을 해석할 수 있었다.

• Asia pacific journal of information systems
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• 제8권3호
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• pp.37-49
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• 1998

The basic goal of CALS is to improve transactions and relationships among organizations through information sharing and integration. CALS is an information strategy which needs strong cooperation between organizations or between users and developers in design step. However, current design methodologies using IDEF models, that are considered to be standard for CALS system development, has some limitations. For example, it is difficult for system developers to communicate with counterparts by IDEF model since IDEF models are difficult for counterparts to understand. In this paper, we suggest a development methodology for GALS systems by complementing IDEF model with Document Trace Diagram, which we developed as a communication tool, The concept of Document Trace Diagram stems from the fact that most information exchanged within or between organizations is in the form of documents and most standard operating procedures of organizations are about processing the documents. It helps system developers identify functions and their ICOMs (Input, Control, Output, Mechanism) with ease and little communication cost. With this methodology, we have constructed the GALS prototype system for construction industry.

• Computers and Concrete
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• 제7권2호
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• pp.159-167
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• 2010

This paper demonstrates numerical techniques for complex large-scale modeling with microplane constitutive theories for reinforced high strength concrete, which for these applications, is defined to be around the 7000 psi (48 MPa) strength as frequently found in protective structural design. Applications involve highly impulsive loads, such as an explosive detonation or impact-penetration event. These capabilities were implemented into the authors' finite element code, ParaAble and the PRONTO 3D code from Sandia National Laboratories. All materials are explicitly modeled with eight-noded hexahedral elements. The concrete is modeled with a microplane constitutive theory, the reinforcing steel is modeled with the Johnson-Cook model, and the high explosive material is modeled with a JWL equation of state and a programmed burn model. Damage evolution, which can be used for erosion of elements and/or for post-analysis examination of damage, is extracted from the microplane predictions and computed by a modified Holmquist-Johnson-Cook approach that relates damage to levels of inelastic strain increment and pressure. Computation is performed with MPI on parallel processors. Several practical analyses demonstrate that large-scale analyses of this type can be reasonably run on large parallel computing systems.