• Journal of Electrical Engineering and Technology
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• 제8권6호
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• pp.1579-1589
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• 2013

We provide a step-by-step, easy-to-follow procedure for the method of controlled Lagrangian systems. We apply this procedure to solve the energy shaping problem for four benchmark examples: the inertial wheel pendulum, an inverted pendulum on a cart, the system of ball and beam and the Furuta pendulum.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1996년도 가을 학술발표회 논문집
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• pp.315-321
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• 1996

The structural topology optimization presented in this paper is based on an evolutionary procedure, developed by Xie and Steven, in which the low stressed material of a structure is removed from the structure step-by-step until an optimal design is obtained. By appling this procedure a layout or topology of a structure can be found from a initial block of material. The purpose of this paper is to implement the evolutionary procedure, introduce some novel features and investigate its feasibility by studying a few examples.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 춘계학술대회 논문집 에너지변화시스템부문
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• pp.46-49
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• 2009

An optimal design procedure is proposed to effectively reduce the torque ripple by optimizing the rotor pole shape of the spoke type IPMSM with concentrated winding. The procedure is composed of two steps. In step I, the steepest descent method (SDM) is used with only two design variables to rapidly approach the optimal shape. From the near optimal rotor shape as a result of the step I, the design variables are reselected and the drawing spline curves are utilized to explain more complex shape with the Kriging model in step II. By using an optimal design procedure, we show that the optimized rotor pole shape of the spoke type IPMSM effectively reduces the torque ripple while still maintaining the average torque.

• 대한조선학회논문집
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• 제34권4호
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• pp.119-126
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• 1997

본 논문에서는 선박의 기본계산 프로그램인 "SIKOB" 의 구획관련 계산데이터를 다음 단계의 설계데이터로 전달하기 위하여 STEP 데이터화 하는 일련의 과정을 자동적으로 처리하는 시범 시스템을 개발하였다. 선형 및 구획스키마를 구축하였고, 이들을 SIKOB의 계산데이터로 인스턴스화 하여 STEP의 물리적 파일을 만들고 이를(형상 및 속성정보를 포함한 STEP 물리적 파일) CAD 시스템에 전달하여 CAD 작업을 한 후 다음 단계의 설계데이터로 활용할 수 있음을 나타낸다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.722-729
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• 2007

The methodology for maintenance system development should overall be considered with all of task characteristic, schedule, and the technical condition of investment sources. This research applies Waterfall model to methodology for the development and construction of maintenance system through customizing the CD (Custom Development) procedure of "HSDM (Hyundai System Development Methodology)" based on information engineering. The waterfall model called as classic life cycle paradigm is defined for the sequent development procedure, which make progress a next step after that a previous step is admitted with thorough review. This model which is popular and the oldest paradigm is used for system development by four steps; demands analysis, design, construction, and maintenance. This methodology advances higher abstract step from higher lower step using top-down approach from concept definition to construction, which notices the end of a step whenever a step is over. Therefore, each step is exactly divided, and consequently the output is clearly yielded.

• 한국가정과교육학회지
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• 제2권1호
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• pp.123-142
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• 1990

The aim of this study is to apply lesson design of high school home economics to model which consists of six steps of instructional procedure among various models for instructional design, Through thesis, central content of each step was written as follows; 1) At the step of establishment of terminal instructional objectives, educational objectives, terminal instructional objectives was analyzed and specific instructional objectives was extracted. 3) At the step of diagnosis of entering behavior, ability of prior learning and ability of preliminary learning were evaluated, which was used as establishing instructional strategy and doing individual guidance. 4)At the step of determining instructional strategy, instructional strategy should be extracted by considering instructional event which is adequate to content of instruction. Instructional strategy consists of five main factor, factors, those are, activity of introduction of instruction, presentation of content of instruction and information, participation of learner and learning activity, identification of learning result, and subsequent treatment after evaluation. 5)Specific activity at the step of selection and development of instructional media consists of reidentification of instructional objectives determination of learning type, drawing up instructional media analysis sheet, synthesis of selected media, and explanatory note of selected media. In order to increase efficiency of instruction at the step of determining instructional strategy, this step should be considered simultaneously. 6)The step of try-out and evaluation of instructional design should be efficient when designed instruction was inputted at class after evaluation of each step of instructional design.

• 한국지진공학회논문집
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• 제26권1호
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• pp.23-30
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• 2022

This study proposed a simplified finite element analysis procedure for designing the nonstructural masonry wall in the out-of-plane direction. The proposed method is a two-step elastic analysis procedure by bilinearizing the behavior of the masonry wall. The first step analysis was conducted with initial stiffness representing the behavior up to the effective-yield point, and the second step analysis was conducted with post-yield stiffness. In addition, the orthotropic material property of the masonry was considered in the FE analysis. The maximum load was estimated as the sum of the maximum loads in the first and second step analyses. The maximum load was converted into the moment coefficients and compared with those from the yield line method applied in Eurocode 6. The moment coefficients calculated through the proposed procedure showed a good match with those from the yield line method with less than 6% differences.

• 한국자동차공학회논문집
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• 제4권4호
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• pp.190-200
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• 1996

Step-by-step time integration methods are widely used for solving structural dynamics problem. One difficult yet critical choice an analyst must make is to decide an appropriate time step size. The choice of time step size has a significant effect on solution accuracy and computational expense. The objective of this research is to derive error estimate for newly developed time integration method and develop automatic time step size control algorithm for structural dynamics. A formula for computing error tolerance is derived based on desired period resolution. An automatic time step size control strategy is proposed based on a normalized local error estimate for the generalized-α method. Numerical examples demonstrate the developed strategy satisfies general design criteria for time step size control algorithm for dynamic problem.

• 한국전자파학회논문지
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• 제18권7호
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• pp.748-756
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• 2007

SIR(Stepped Impedance Resonator) 공진기로 구성된 대역 여파기는 특히 높은 주파수에서 fringing capacitance와 step 임피던스 불연속 영향으로 설계와 다른 왜곡된 주파수 응답을 가진다. 본 논문은 EM(Electromagnetic) 시뮬레이션을 통해 fringing capacitance와 step 임피던스 불연속 영향을 보상하는 절차를 보였다. 이 방법은 여파기에서 개별 공진기의 결합 전송선 및 결합 전송선을 연결하는 전송 선로를 체계적으로 조정하는 절차이며, 각 공진기 조정 후 제 결합하면 더 이상의 추가 조정을 요구하지 않는다. 또한, 본 방법의 타당성을 보이기 위하여 설계된 5단 SIR 여파기를 제작하여 EM 시뮬레이션 결과와 비교함으로써 방법의 타당성을 보였다.

• 대한안전경영과학회지
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• 제8권4호
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• pp.181-193
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• 2006

The purpose of this thesis addresses a development of an expert system to support a decision making of the vender selection. The researches related to the vender selection problems have been studied and they provide 23 criteria to select proper venders. In this thesis, 8 criteria have been used to construct a knowledge base of the expert system. The system in this thesis consists of 6 steps in its procedure. Step 1 decides a specification that satisfies customer's needs and Step 2 chooses a part supplied by a vender. The type of an outside order is decided in Step 3 and some venders satisfying the customer's needs are selected in Step 4. Some of the venders chosen from step 4 which do not satisfy the fatal cirteria(that is Quality, Delivery, Price) can be deleted in Step 5. In the last step, 8 cirteria is used to select 3 venders according to their ranking. Consequently, this program provides for a man, who does not have the experiances, an efficient way to select appropriate venders in the vender selection problems.