• Journal of Institute of Control, Robotics and Systems
• /
• v.3 no.4
• /
• pp.332-337
• /
• 1997

디스크립터(Descriptor) 표현은 상태공간 표현을 확장시킨 일반적인 시스템의 기술방법으로 파라미터의 물리적인 구조를 보존하고 있으며, 임펄스를 포함한 현상을 기술할 수 있다. 또한, 대규모 시스템의 모델화가 용이하며, 프로퍼(Proper)이지 않은 시스템을 기술할 수 있고 구속조건을 가진 동적시스템의 기술이 가능하는 등의 특징을 지니고 있다. 그러나, 디스크립터 시스템의 해는 미분항을 포함하고 있으므로 노이즈 및 파라미터 변동에 대해서 매우 민감하여, 관측기설계시 강인(Robust)한 관측기설계가 요구된다. 본 논문에서는 디스크립터 시스템에 대해 로바스트 관측기의 일종인 비례적분(PI) 관측기의 설계에 대해서 논한다. 먼저, 디스크립터 시스템에 대한 PI 관측기의 존재조건을 유도하였으며, 체계적인 설계법을 보였다. 또한, PI 관측기의 존재조건이 Rosenbrock의 가관측 조건하에서 간단히 보여지며, 이것은 시스템 행렬의 Rank 조건에 의해 쉽게 구해질 수 있다.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.27 no.4
• /
• pp.499-506
• /
• 2003

The design cycle associated with large engineering systems requires an initial decomposition of the complex system into design processes which are coupled through the transference of output data. Some of these design processes may be grouped into iterative subcycles. In analyzing or optimizing such a coupled system, it is essential to determine the best order of the processes within these subcycles to reduce design cycle time and cost. This is accomplished by decomposing large multidisciplinary problems into several sub design structure matrices (DSMs) and processing them in parallel This paper proposes a new method for parallel decomposition of multidisciplinary problems to improve design efficiency by using the multi-objective genetic algorithm and two sample test cases are presented to show the effect of the suggested decomposition method.

• Journal of Korean Association for Spatial Structures
• /
• v.10 no.4
• /
• pp.133-140
• /
• 2010

This paper studies on the instability behaviour of the Seoul southwest baseball dome. The nonlinear Snapping phenomenon of the structure is investigated about the load mode by the design load of analysis structure and these combined loads. The initial imperfection obtains the buckling mode through the eigenvalue analysis of the tangential stiffness matrix and uses this for the nonlinear analysis. However, the buckling of members or the local buckling, and etc don't consider in the research range of this research task. Also it is limited the overall buckling phenomenon.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.14 no.5
• /
• pp.506-512
• /
• 2003

An output multiplexer of manifold type is widely used in a recent satellite transponder f3r its mass and volume reduction. For correct operation, the filter of such a multiplexer must be singly terminated. In this paper, a simple synthesis method of a 6-pole dual-mode singly terminated filter is described. From the transfer function of the filter, network parameters such as in/output terminations and coupling matrix are obtained with the aid of orthogonal projection and plane rotation. The rotation order, pivot, and rotation angle of the plane rotation process are given for easy filter synthesis. Two different-structure filters are taken into consideration and the network parameters of each filter have been obtained from the same transfer function. The method described in this paper can be applied to the other degree singly terminated filter.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.15 no.1
• /
• pp.105-116
• /
• 2002

In this paper, an analytical model to predict the resisting capacity of slender RC columns is introduced. Material and geometric nonlinearities are taken into account, and the layer approach is adopted to simulate the different material properties across the sectional depth. On the basis of the obtained numerical analysis results, an improved design equation as a function of concrete strength, slenderness ratio, steel ratio and eccentricity for slender RC columns, which can be used effectively in the preliminary design stage, is introduced. Finally, P-M interaction diagrams constructed by the introduced equation are compared with the ACI method with the objective of establishing the relative efficiencies of the introduced equation.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.19 no.5
• /
• pp.541-546
• /
• 2008

A novel, simple and broadband $90^{\circ}$ phase shifter was proposed and fabricated by the LTCC process. It is composed of a $180^{\circ}$ transmission line between two $90^{\circ}$ shorted transmission lines. Design equations for the proposed $90^{\circ}$ phase shifter are derived by the method of admittance parameter analysis. Based on design equations, $90^{\circ}$ phase shifter was designed and fabricated to operate in the C-band with ${\pm}2^{\circ}$ of phase deviation.

• Journal of the Institute of Convergence Signal Processing
• /
• v.11 no.3
• /
• pp.244-249
• /
• 2010

The design of error correction code with low complexity has a good attraction for next generation multi-level cell flash memory. Sharing sub-expressions is effective method to reduce complexity and chip size. This paper proposes a new design method of m-bit parallel BCH encoder based on serial linear feedback shift register structure with low complexity using sub-expression. In addition, general algorithm for obtaining the sub-expression is introduced. The sub-expression can be expressed by matrix operation between sub-matrix of generator matrix and sum of two different variables. The number of the sub-expression is restricted by. The obtained sub-expressions can be shared for implementation of different m-parallel BCH encoder. This paper is not focused on solving a problem (delay) induced by numerous fan-out, but complexity reduction, expecially the number of gates.

• The Journal of the Convergence on Culture Technology
• /
• v.5 no.1
• /
• pp.395-399
• /
• 2019

In order to support various parallel computing systems, it is necessary to extend LLVM IR to more efficiently support vector / matrix and to design LLVM IR to machine code as a new algorithm. As shown in the IR example, RISC instruction generation is naturally generated because the RISC instruction is basically composed of the RISC instruction, and the vector instruction is also not supported. There is a need for new IR structures, command generation algorithms and related extensions to support vector / matrix more robustly. To do this, it is important to map each instruction in the LLVM IR to the appropriate instruction in the target architecture (vector / matrix) (instruction selection algorithm). It is necessary to understand the meaning of LLVM IR command, to compare the meaning of each instruction of the target architecture with syntax, and to select the instruction that matches the pattern to make mapping efficient.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.5 no.3
• /
• pp.64-71
• /
• 1991

본 논문에서는 계장제어 터어보 발전기 시스템에 대한 강인제어 문제가 연구되었다. Riccati형 행렬 방정식과 상태궤환을 이용해 센서 고장시 고장된 루프에 관계없이 2입력 2출력터어보-발전기 시스템이 안정하게 제어될 수 있는 방법을 제안하고 보전성을 갖지 않는 경우와 시뮬레이션을 통해 이를 비교 입증하였다. 그 결과 보전성을 고려하지 않고 설계된 이득에 의한 폐 루프 시스템은 고장에 대해 매우 불안정한 응답을 보인 반면 제안된 기법에 의해 보전성을 갖도록 설계한 이득에 의한 폐 루프 시스템에서는 고장에 관계없이 안정한 응답을 나타내어 구조가 복잡한 다변수 시스템의 강인 제어에 응용될 수 있음을 잘 입증하고 있었다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2018.10a
• /
• pp.380-382
• /
• 2018

사이버 물리 시스템의 발달은 네트워크 기반 제어 시스템을 다양한 형태로 진화시키고 있다. 네트워크에서는 전송 지연과 전송 오류에 의해서 다양한 불규칙한 지연이 발생하고 지연에 강인한 제어기 설계가 요구되고 있다. 마코프 프로세서를 따르는 지연을 갖는 제어 시스템에서 제어기를 설계할 때에 많이 사용되는 모델중에 하나가 확장된 상태 벡터를 기반으로 한 마코프 점프 선형 시스템 모델이다. 본 연구에서는 이 모델을 이용하여 리아푸노프 안전성 조건으로부터 유도되는 선형 행렬 부등식의 안정성 조건으로부터 저복잡도를 가지고 제어기를 유도하는 직관적 방법을 제안한다. 제안된 알고리즘은 모의 실험을 통해서 성능을 확인하였으나, 직관적 방법 구조상에서 제한 조건의 수가 자유 변수의 수보다 많은 이유 때문에 성능이 배우 제한적임을 확인하였고, 이를 개선하기 위한 향후 연구가 요청됨을 확인하였다.