• Computers and Concrete
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• 제24권3호
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• pp.259-269
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• 2019

The work aims at the comparison among commonly used research programs concerning moment-curvature ($M-{\chi}$) diagrams of confined R.C. members. The software considered in this work are Sap2000, SeismoStruct and Opensees. The curves provided by these software, given the same modelling, have been compared to those provided by a theoretical fiber model. A parametric analysis has been led on rectangular column sections with different level of axial load and different stirrups spacing. The accuracy of the modelling of the considered structural programs has been investigated by comparing their results with those obtained by applying the theoretical fiber model.

• 한국정보처리학회논문지
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• 제3권5호
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• pp.1082-1092
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• 1996

현재, 과학, 기술 문서 등에 많은 사용되는 수식의 표기법이 TeX, EQN등과 같이 가특정 시스템에 의존하여 시스템간의 상호교환이 안되고 있다. 따라서 본 논문에서는 워드프로세서나 전자출판등에서 작성되는 수식 정보의 공유 및 시스템간 상호 교환성 을 확보하기 위하여, 국제 표준 SGML 표기법으로 수식을 표현할 수 있고, 또한 수식용 문서형 정의(Document Type Definition)에 따라 수식 구조의 오류 검사 기능을 갖는 대화형 수식 편집기의 설계 및 구원을 한다. 사용자 접속으로는 수식 심볼 아이콘에 대한 마우스 입력과 키보드 입력 등의 직접 조작 방식을 구현하였다. 구현 환경으로는 워크스테이션 상에서 UNIX를 운영 체제로 하는 X 윈도우 시스템과 그래픽컬 사용자 접속인 OSF Motif를 사용하였고 메뉴 및 화면 구성을 위하여 OSF UIL(User Interface Language)을 사용하였다.

• 한국정보처리학회논문지
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• 제3권5호
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• pp.1103-1111
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• 1996

하드웨어와 통신 기술의 발달로 가능하게 된 분산처리 시스템은 수행 방식이 비결 정적이고 복잡하기 때문에 소프테웨어의 디자인이 비분산처리 시스템에 비해 복잡하고 또한 까다롭다. 따라서 하드웨어에 비해 상대적으로 뒤져있는 분산처리 시스템 소프 트웨어 개발을 위한 디자인 방법에 관한 연구에 대한 필요성이 높아지고 있다. 한편 객체향 시스템과 분산처리 시스템은 상호 유사한 점이 있어, 분산처리 시스템 개발에 객체지향 기술의 적용은 자연스럽게 이루어질 수가 있다. 본고에서는 분산에서는 분산처리 시스템 설계를 위한 객체지향 기술의 적용에 대하여 소개하고 있다. 제안된 설계방법은 다양한 그래픽 모델, 즉, 자료구조도, 상태전이도 그리고 패트리 네트의 정보를 조합하여 객체와 행위 그리고 이들 간의 관계에 대한 정보를 추출하여 분산 처리 시스템에 적합한 명세서를 산출하고자 한다. 지식베이스를 정보저장소로 이용 하여정보의 저장, 검색 뿐만 아니라, 정보의 오류 연구를 검증할 수가 있다. 본 방법의 최종 결과인 객체모델은 디자인 명세서로서 분산처리프로그램 개발에 사용된다.

• Coupled systems mechanics
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• 제2권2호
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• pp.159-174
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• 2013

The present work aims at investigating the nonlinear dynamics, bifurcations, and stability of an axially accelerating beam with an intermediate spring-support. The problem of a parametrically excited system is addressed for the gyroscopic system. A geometric nonlinearity due to mid-plane stretching is considered and Hamilton's principle is employed to derive the nonlinear equation of motion. The equation is then reduced into a set of nonlinear ordinary differential equations with coupled terms via Galerkin's method. For the system in the sub-critical speed regime, the pseudo-arclength continuation technique is employed to plot the frequency-response curves. The results are presented for the system with and without a three-to-one internal resonance between the first two transverse modes. Also, the global dynamics of the system is investigated using direct time integration of the discretized equations. The mean axial speed and the amplitude of speed variations are varied as the bifurcation parameters and the bifurcation diagrams of Poincare maps are constructed.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.309-312
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• 1997

The dynamic characteristics of a continuous MMA/MA free-radical solution copolymerization reactor were studied. A mathematical model was developed and kinetic parameters which had been estimated in the previous work were used. With this model, bifurcation diagrams were constructed with various parameters as the bifurcation parameter to predict the region of stable operating conditions and to enhance the controller performance. It was shown that the steady-state multiplicity existed over wide ranges of residence time and jacket inlet temperature. Periodic solution branches were found to emanated from Hopf bifurcation points. Under certain conditions isola was also observed, which would result in poor performance of feedback controllers.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.494_495
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• 2009

This paper presents a study of DFIG wind power generation system for real-time simulation. For real-time simulation, the real-time digital simulator (RTDS) and its user friendly interface simulation software (RSCAD) are used. 2.2MW grid-connected variable speed DFIG wind power generation system is modeled and analyzed in this study. Stator-flux oriented vector control scheme is applied to stator, rotor side converter control, and back-to-back PWM converters are implemented for the decoupled control. The real-wind speed signal extracted by an anemometer is used for realistic and accurate simulation analysis. Block diagrams for DFIG and control scheme of stator, rotor-side are introduced. Real-time simulation cases are carried out and analyzed for the validity of this work.

• 한국건축시공학회지
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• 제12권6호
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• pp.558-565
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• 2012

Schedule management of construction work is critical to completing construction projects within a given period of time. Many efforts have been made and multiple tools have been developed to support the management of construction projects using smart devices such as smartphones and tablet PCs. This study proposed a method for managing construction schedules via a smart device using Flash. The interactive and graphic properties of Flash enable the development of an app that can allow a field manager to manage schedules easily and efficiently. A prototype was implemented using Adobe Flex Builder, and a sample network was applied in a smartphone. It is convenient for a construction manager to manage construction schedules using the tool because Flash controls graphic components easily. In further studies, network diagrams such as CPM (Critical Path Method) should be developed and applied to the app.

• Structural Engineering and Mechanics
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• 제9권2호
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• pp.181-193
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• 2000

The objective of this research is to propose a new global damage detection parameter, termed as the static defect energy (SDE). This candidate parameter possesses the ability to detect, locate and quantify structural damage. To have a full understanding about this parameter and its applications, the scope of work can be divided into several tasks: theory and formulation, numerical simulation studies, experimental verification and feasibility studies. This paper only deals with the first part of the task. Brief introduction will be given to the dynamic defect energy (DDE) after systematically reviewing the previous works. Process of applying the perturbation method to the oscillatory system to obtain a static expression will be followed. Two implementation methods can be used to obtain SDE equations and the diagrams. Both results are equally good for damage detection.

• 디지털산업정보학회논문지
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• 제13권3호
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• pp.35-42
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• 2017

This paper presents hardware implementation of background timing-skew calibration technique for time-interleaved analog-to-digital converters (TI ADCs). The timing skew between any two adjacent analog-digital (A/D) channels is detected by using pure digital Finite Impulse Response (FIR) delay filter. This paper includes hardware architecture of the system, main units and small sub-blocks along with control logic circuits. Moreover, timing diagrams of logic simulations using ModelSim are provided and discussed for further understanding about simulations. Simulation process in MATLAB and Verilog is also included and provided with basic settings need to be done. For hardware implementation it not practical to work with all samples. Hence, the simulation is conducted on 512 TI ADC output samples which are stored in the buffer simultaneously and the correction arithmetic is done on those samples according to the time skew algorithm. Through the simulated results, we verified the implemented hardware is working well.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.362-370
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• 1996

Even if the shock absorber is developed to Variable S/A or Active S/A, it is necessary to construct data-base or build the dynamic performance characteristic program of Oil S/A. Since both Variable S/A and Active S/A are based on the principle of Oil S/A. To obtain the design technique of Oil S/A, we model the damping mechanism and characteristics of an Oil S/A whose performance was testified. And then it is analyzed the dynamic behaviour characteristics of damping mechanism.