• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 Proceedings of the Korea Automatic Control Conference, 11th (KACC); Pohang, Korea; 24-26 Oct. 1996
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• pp.24.1-24
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• 1996

The development of future aircraft that involves the expanded flight envelop will place increased performance requirements on the design of the flight control system. Maneuvering areas are expanding into flight envelopes characterized by significantly larger levels of modeling uncertainty than encountered in present flight control designs. Conventional flight control techniques that ignore the effects of large parameter variations, modeling uncertainties and nonlinearities, will likely produce designs with poor performance and robustness. Recent advances in modern control theories called advanced control theories, most notably the H$\_$.inf./ synthesis technique, adaptive control and neural network application, offer the promise of a design technique that can produce both high performance and robust controllers for next generation aircraft. This special lecture will survey the recent development in advanced flight control and review the possible application of advanced control theories.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 1997년도 한국전자거래학회 종합학술대회지
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• pp.127-132
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• 1997

본 논문의 연구방향은 객체지향방법론을 이용하여 PDM에서의 워크플로우를 재설계하는 것이다. 기존의 방법론들은 워크플로우 엔진과 작업자 사이의 흐름에 중점을 두었으나 본 논문에서는 프로세스와 작업에 중점을 두고 이를 각각의 객체로 설계하는 방안을 연구하고자 한다. 시스템의 설계를 위하여 Rumbaugh의 OMT(Object Modeling Technique) 방법론을 기본모델링 방법론으로 사용한다. 연구내용은 object model을 통한 정적 구조 설계, dynamic model을 이용한 시간에 따른 동적 구조 설계, 그리고 functional model에서의 데이터의 전이 및 시스템간의 연계의 설계이다. 특히 object model에서의 작업설계 및 dynamic model에서의 상태변화에 중점을 두고 DCOM(Distributed Component Object Model)을 사용하여 작업(task)을 중심으로 한 분산환경을 구현한다.

• 대한전자공학회논문지
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• 제10권6호
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• pp.11-24
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• 1973

본 논문에서는 전압안정 및 전류안정부저항영역을 갖는 2단자회로를 해석함에 있어서 따로 입력변화의 함수로서 표시되는 등가주전력을 사용하였고 부저항회로에 대한 간단한 새로운 통일된 해석을 할 수 있음을 도시법을 기초로 하여 제시하였다. 이 해석에 의거한 설계방법의 예로서 접합트랜지스터를 사용한 부성저항회로구성을 하였으며 이 회로를 기본으로 하여 SCR, GTO-SCR 및 SSS 특성의 한 모데링회로를 제안하였다. 이들 모데링회로의 촙핑회로, 톱니파발생회로 및 교류위상제어회로로서의 응용예와 그 특성을 아울러 검토하였다.

• 대한기계학회논문집A
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• 제26권8호
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• pp.1638-1644
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• 2002

A novel locomotion using the pneumatic impulsive actuator was proposed for robotic colonoscope. This locomotion showed good moving performance in the environment of rigid pipe, however, the displacement per one impact(step displacement) is greatly reduced due to the low stiffness and high damping characteristics of the colon. Therefore, the modeling technique based on spring and damping system is studied to predict the step displacement and some parametric studies are carried out to investigate main parameters that influence the step displacement of locomotion. Based on simulation result, a new locomotion to control the resistance force is suggested and fabricated. Through the experiment on the colon, the usefulness of modeling technique is confirmed and successful improvement of moving characteristics is achieved.

• 환경영향평가
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• 제19권3호
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• pp.307-314
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• 2010

Brebbia's model has been analyzed to develop the appropriate waterworks management system in Korea, and compared with the conventional models such as EPANET, WaterCad, and InfoWorks. The hydraulic theory of the models was analyzed. Each model's numerical techniques, required parameters, input data and operational methodologies, restrictions, practical applicability and other aspects were investigated. In order to check the validity of Brebbia model, the comparative analysis with EPANET, WaterCAD, and InfoWorks models was performed for linear and nonlinear cases. To find out advantages and disadvantages of each model, the modeling was performed for a simple network and for more complicated A city waterworks system, and the three models applicability was examined. Finally, optimal modeling technique and a model suitable for the use in Korea was suggested, and the problems related to present projects of waterworks management system in Korea were analyzed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.884-885
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• 2011

A great deal of external magnetic variation is required to demagnetize a magnetic material. In order to analyze a demagnetization model, hysteresis is employed and the best numerical analysis technique so far, regarding hysteresis, is Preisach model. In general, Preisach model, however, bears the instability problem with respect to convergence and hence in this paper, a method adopting M-B variables is proposed to solve the problem. In addition, comparison is made between the experimental MTF equipment and the hysteresis modeling technique for the purpose of developing an effective demagnetization protocol.

• 한국컴퓨터산업학회논문지
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• 제2권8호
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• pp.1099-1108
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• 2001

본 논문에서는 웹 기반의 분산 소프트웨어 개발 환경에서 원시 코드 중심의 버전뿐만 아니라 원시 코드 이전 단계의 UML(Unified Modeling Language) 기반의 소프트웨어 개발 환경에서 발생하는 다양한 설계 객체들을 일정한 형태로 구축하여 효율적으로 관리하는 방법론을 제시하였다. 또한, 웹을 기반으로 한 분산 소프트웨어 개발 과정에서 발생하는 버전들을 일관성 있게 관리하기 위해 버전 규칙에 기초한 웹 기반의 규칙 버전 관리 모델을 설계하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2014년도 춘계학술대회
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• pp.36-37
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• 2014

It is necessary to develop highly sophisticated Modeling & Simulation (M&S) system for the scientific investigation of marine accident causes and for the systematic reproduction of accidental damage procedure. To ensure an accurate and reasonable prediction of marine accidental causes, such as collision, grounding and flooding, full-scale ship M&S simulations would be the best approach using hydrocode, such as LS-DYNA code, with its Fluid-Structure Interaction (FSI) analysis technique. The objectivity of this paper is to present three full-scale ship collision, grounding and flooding simulation results of marine accidents, and to show the possibility of the scientific investigation of marine accident causes using highly sophisticated M&S system.

• 한국조명전기설비학회지:조명전기설비
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• 제11권4호
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• pp.100-108
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• 1997

기동 돌입전류가 없는 역률개선을 위한 강압형과 승합형이 결합된 형태의 새로운 푸시풀 퀀텀 직렬공진형 정류기를 제안한다. 제안된 정류기의 동적모델링을 개발하여 기동 돌입전류를 제거하는 제어기법을 제안하였으며 컴퓨터 시뮬레이션과 실험을 통하여 제안된 정류기와 제어기법의 유용성을 보였다. 제안된 방식으로 고역률과 넓은 출력진압 범위를 얻었다.

• 한국경영과학회지
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• 제39권1호
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• pp.13-27
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• 2014

In this paper, we deal with a Steiner Ring Star (SRS) problem arising from the design of survivable telecommunication networks. We develop two mixed integer programming formulations for the SRS problem by implementing Miller-Tucker-Zemlin (MTZ) and Sarin-Sherali-Bhootra (SSB) subtour elimination constraints, and then apply the reformulation-linearization technique (RLT) to enhance the lower bound obtained by the LP relaxation. By exploiting the ring-star structure of underlying network, we devise some valid inequalities that tighten the LP relaxation. Computational results demonstrate the effectiveness of the proposed solution procedure.