• Journal of the Korea Society for Simulation
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• v.4 no.1
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• pp.99-112
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• 1995

본 연구는 새로운 객체 지향 모델링 방법으로 VOOM(Various Object-Oriented Modeling)을 제안한다. VOOM은 시스템의 요소 뿐만 아니라 시스템 요소들간의 관계 및 그들로 이루어진 구조를 서로 유형이 다른 프레임으로 정의하여 객체화시키고, 객체화된 시스템 요소 및 관계, 구조를 서로 연결하여 하나의 시스템을 구축하도록 한다. 따라서 전체 시스템의 측면에서 구성 요소의 역할과 전체적인 시스템의 행위 및 구조를 쉽게 파악할 수 있도록 한다. VOOM을 통한 모델링 작업은 체계화되고 검증이 용이해지며, 모델의 유연성 및 재사용성이 확장되어질 수 있다. VOOM에 의한 모델링 작업 지원 가능성이 컴퓨터 통신망을 대상으로 한 시뮤레이션 모델링 예를 통해 제사하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11c
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• pp.2145-2148
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• 2002

e-비즈니스 활성화에 따른 물류 환경의 변화로 인해 시장의 확대와 경쟁력 강화를 위한 효과적인 물류망 관리 요구가 대두되고 있다. 인터넷 기반의 B2B는 서로 다른 플랫폼과 서로 다른 문서 구조를 가지고 있으므로 상호운용성에 많은 어려움이 존재하기 때문에 XML를 이용한 전자상거래의 표준인 ebXML를 이용하여 여러 기업간의 업무 프로세스 통합을 효율적으로 수행하도록 한다. e-Logistics 프로세스의 다자간 협업을 위해서 프로세스 자동화를 위한 프로세스 중심의 워크플로우 프로세스 모델링과 역할 중심의 양자간 협업을 위한 ebXML 프로세스 모델링을 기반으로 ebXML 기반의 e-Logistics 프로세스 모델링을 제안한다. 본 논문에서는 인터넷 기반의 B2B 물류 비즈니스 프로세스 모델링을 위한 ebXML 기반의 e-Logistics 프로세스 모델링 시스템 아키텍쳐를 설계한다.

• Journal of the Korean Institute of Intelligent Systems
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• v.17 no.7
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• pp.875-880
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• 2007

Scientific challenges in the field of MR(magnetorheological) fluids and devices consist in the development of MR devices, the mathematical modeling and simulation of MR devices, and the development of (optimal) control algorithm for MR device systems. To take a maximum advantage of MR fluids in control applications a reliable mathematical model, which predicts their nonlinear characteristics, is needed. A inverse model of the MR device is required to calculate current(or voltage) input of MR damper, which generates required damping force. In this paper, we implemented test a bench for shear mode rotary MR damper and laboratory tests were performed to study the characteristics of the prototype shear-mode rotary MR damper. The direct identification and inverse dynamics modeling for shear mode rotary MR dampers using multi-layer neural networks are studied.

• Journal of the Korean Society for Precision Engineering
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• v.19 no.4
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• pp.25-33
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• 2002

• Journal of Korean Society of Industrial and Systems Engineering
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• v.20 no.42
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• pp.9-19
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• 1997

최근 제조업체들은 고객의 다양한 요구와 제품의 Life Cycle 단축에 따른 제조환경의 변화 에 직면하고 있다. 이러한 변화에 능동적으로 대처하기 위한 수단으로 효율성과 유연성이 크게 부각된 유연생산시스템(FMS)의 역할은 대단히 크다. 따라서, 본 연구에서는 유연생산시스템을 평가하고 모델링하는 도구인 Petri net 모델링 기법을 이용하여 효율성이 뛰어난 흐름생산방식을 적용한 복잡한 유연생산 시스템의 통제시스템 모델 설정과 시스템정지(deadlock) 예방에 대한 분석을 하였으며, AGVs의 셀이동 생산시스템을 제어할수 있는 FMS의 계층적 TPN 모델링을 구축하였다.

• Proceedings of the KIEE Conference
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• 2007.10c
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• pp.185-188
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• 2007

본 논문에서는 수소이온교환막 연료전지의 퍼지 모델링 기법을 제안하였다. 수소이온교환막 연료전지는 가정용으로 공급이 적합한 연료전지로서 최근들어 많은 연구가 진행되고 있다. 연료전지 특성 모델은 이러한 연구에 중요한 역할을 하고 있으면 이 때문에 다양한 연료 전지 모델링 기법들이 제안되고 있다. 본 논문에서는 선형 행렬부등식 최적화기법을 기반 새로운 형태의 퍼지 모델링 기법이 제안되었다. 최종적으로 시뮬레이션을 통해 제안된 기법의 우수성을 확인하였다.

• Journal of The Korean Association For Science Education
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• v.36 no.4
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• pp.551-561
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• 2016

The purpose of this study is to investigate both theoretically and empirically the roles of models in abductive reasoning for scientific problem solving. The context of the study is design-based research the goal of which is to develop inquiry learning programs in the domain of earth science, and the current article dealt with an early process of redesigning an abductive inquiry activity in geology. In the theoretical study, an extensive review was conducted with the literature addressing abduction and modeling together as research methods characterizing earth science. The result led to a tentative scheme for modeling-based abductive inference, which represented relationships among evidence, resource models, and explanatory models. This scheme was improved by the empirical study in which experts' reasoning for solving a geological problem was analyzed. The new scheme included the roles of critical evidence, critical resource models, and a scientifically sound explanatory model. Pedagogical implications for the support of student reasoning in modeling-based abductive inquiry in earth science was discussed.

• The Journal of Korean Institute of Next Generation Computing
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• v.13 no.4
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• pp.112-123
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• 2017

Research for the inverse estimation of RF threats and the efficient electronic attack based on the parameters of the electronic information has been active in the electronic warfare (EW) situations. In this paper, an EW transmission simulator is constructed from the modeling of radar threats, EW receivers, and propagation environments with the collected electronic information in order to verify the performance of the inverse estimation algorithm in various and practical EW situations. In simulation results, we show that the range tracking error and angle tracking error are produced within ten meters and one degree, respectively. And also, we show that the changing relations between the angle tracking error and the parameters of the monopulse angle tracking radar such as the beamwidth and squint angle in simulation results correspond with those in the theoretical modeling. Accordingly, the constructed EW simulator can be used to observe the modifying characteristics of the electronic information in transmission environments, and then, to evaluate the performance of the inverse estimation system in various EW situations.

• School Mathematics
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• v.9 no.4
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• pp.467-486
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• 2007

In mathematical modeling activity modeling process is usually an iterative process. When model can not be solved, the model needs to be simplified by treating some variables as constants, or by ignoring some variables. On the other hand, when the results from the model are not precise enough, the model needs to be refined by considering additional conditions. In this study we investigate the role of spreadsheet model in model refinement and modeling process. In detail, we observed that by using spreadsheet model students can solve model which can not be solved in paper-pencil environment. And so they need not go back to model simplification process but continue model refinement. By transforming mathematical model to spreadsheet model, the students can predict or explain the real word situations directly without passing the mathematical conclusions step in modeling process.

• Journal of the Korean School Mathematics Society
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• v.17 no.4
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• pp.657-677
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• 2014

The present qualitative case study explored the ways in which three middle school students constructed and refined their mathematical models and modeling processes, and factors that had influenced such refinement. The results suggest that students' modeling processes are non-sequential in that the participant students reformulated their initial problem from the real-world problem situation and revised the model when they could not get a satisfactory solution or the acquired solution did not make sense. Moreover, the students' model refinement processes were affected by the following four elements: the types of real-word problem situations, students' metacognitive thinking, communications between teachers and peers, and the role of teachers.