• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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• pp.395-400
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• 1991

In spinning satellite, a gyrotorquer generates a control torquer along two orthogonal axes normal to the spin axis of the vehicle. Matrix Fraction Description(MFD) are used to obtain minimal realization of the transfer matrix relating the attitude angles and the rate of rotation of the gimbals of gyrotorquer. In this paper, the Linear Quadratic Gaussian with Loop Transfer Recovery and H.meihodologies are used to design controller for spinning satellite.

• 대한전자공학회논문지
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• 제12권6호
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• pp.14-20
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• 1975

일반적인 결합불균일선로에 대한 이론을 적용하여 결합삼각함수선로(CTTL)의 특성을 연구하였다. 우선 CTTL의 4-Port 전달메이트릭스 퍼래미터를 유도한 다음 이것을 사용하여 CTTL을 이용한 전역통과회로와 방향통합전압을 해석하였다. 선로에 연한 결합계수의 변화에 따라서 전역통도관로의 위상특성과 방향성결합기의 결합전압의 크기의 변화를 상세하게 연구하였다. 최후로 CTTL를 사용한 광대역 90° 차동위상추이기와 고역통과 방향성통합기의 설계예를 들고 그 실현방법을 고찰하였다. Characteristics of coupled trigonometric transmission lines (CTTL) are studies based on the theory of general coupled nonuniform transmission lines. First, the 4-port transmission matrix parameters of networks and directional couplers using CTTL. The phase slrift characteristic of the all-pass networks and the magnitude characteristic of the directional couplers are studied in detail for various coupling and a high-pass small ripple directional coupler using CTTL are given and their physical realization is considered.

• 융합정보논문지
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• 제8권2호
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• pp.141-148
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• 2018

본 논문은 잊혀질 권리 구현이 지극히 이상적인 정보삭제의 개념을 벗어나 보다 현실적 구현이 될 수 있도록 다각적 관점의 실현범위를 모색하는데 목적이 있다. 국내외 법제 및 기술/서비스 동향을 문헌조사 방식으로 조사 및 비교분석하였으며, 이를 토대로 다각적 분석을 위해 서비스 실현수준, 개인정보처리자의 처리유형과 정보특성, 법제/기술을 고려한 분류 기준을 반영하였다. 그 결과, 현존하는 서비스(시스템)의 실현수준을 파악 하고 보호대상별 다각적 규제범위를 도출하였으며, 잊혀질 권리 실현범위 매트릭스(안)을 제시하였다. 본 연구는 법제 등 사회공학과 공학을 결합한 복합학문, 융합학문의 연구 분야로서 지속적으로 확대 가능하다. 정보주체의 권리인 '삭제권'의 실질적, 구체적 범위를 규명함으로써 사회적 비용에 대한 예측이 가능하고, 기술적 구현모델 및 서비스 개발을 통해 시장 확대와 인력양성에도 기여할 것으로 기대한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1435-1438
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• 2005

In hands-free telephone systems, the received speech signal is fed back to the microphone and constitutes the so-called echo. To cancel the effect of this time-varying echo path, it is necessary to device an adaptive filter between the receiving and the transmitting ends. For a typical FIR realization, the length of the fullband adaptive filter results in high computational complexity and low convergence rate. Consequently, subband adaptive filtering schemes have been proposed to improve the performance. In this work, we use deterministic approach to analyze the relationship between fullband and subband adaptive filtering structures. With block adaptive filtering structure as an intermediate stage, the analysis is divided into two parts. First, to avoid aliasing, it is found that the matrix of block adaptive filters is in the form of pseudocirculant, and the elements of this matrix are the polyphase components of the fullband adaptive filter. Second, to transmit the near-end voice signal faithfully, the analysis and the synthesis filter banks in the subband adaptive filtering structure must form a perfect reconstruction pair. Using polyphase representation, the relationship between the block and the subband adaptive filters is derived.

• 제어로봇시스템학회논문지
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• 제17권9호
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• pp.857-862
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• 2011

This paper studies the output consensus problem for a class of heterogeneous linear multi-agent systems under a fixed directed communication network. The dynamics, as well as its dimension, of each agent can widely differ from the others, but all the agents are assumed to have the same transfer matrix. In addition, only the system outputs are constrained to be delivered through the network. Under these conditions, we show that the output consensus is reached by a group of identical controllers, which is designed to achieve the state consensus for the homogeneous multi-agent system obtained from the minimal realization of the transfer matrix. Finally, an example is given to demonstrate the proposed result.

• 한국통신학회논문지
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• 제10권2호
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• pp.93-103
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• 1985

대역폭 압축에 의한 디지털 신호처리 기술은 최근 몇 년동안 집적회로 기술의 발달에 따라 급성장해왔다. 본 연구에서는 화면의 중앙에 시야가 돋보이며 눈의 감각과 일치하는 Hadamard Matrix의 중앙에 Weight를 준 Nonorthogonal 변환인 Weighted Handamard Matrix를 구하여 실시간처리를 위한 고속계산방법과 Hardware system을 연구하였다. 따라서 본 연구는 항공사진, X-Ray, CATV, 인공위성통신 등 디지탈영상신호처리에 사용할 수 있을 것이다.

• Structural Engineering and Mechanics
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• 제63권6호
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• pp.743-750
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• 2017

Modal parameter identification plays a key role in the structural health monitoring (SHM) for civil engineering. Eigensystem realization algorithm (ERA) is one of the most popular identification methods. However, the complex environment around civil structures can introduce the noises into the measurement from SHM system. The spurious modes would be generated due to the noises during ERA process, which are usually ignored and be recognized as physical modes. This paper proposes an improved stabilization diagram method in ERA to distinguish the spurious modes. First, it is proved that the ERA can be performed by any two Hankel matrices with one time step shift. The effect of noises on the eigenvalues of structure is illustrated when the choice of two Hankel matrices with one time step shift is different. Then, a moving data diagram is proposed to combine the traditional stabilization diagram to form the improved stabilization diagram method. The moving data diagram shows the mode variation along the different choice of Hankel matrices, which indicates whether the mode is spurious or not. The traditional stabilization diagram helps to determine the concerned truncated order before moving data diagram is implemented. Finally, the proposed method is proved through a numerical example. The results show that the proposed method can distinguish the spurious modes.

• 대한의용생체공학회:의공학회지
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• 제15권1호
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• pp.97-104
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• 1994

In the conventional infrared imaging system, complex infrared lens systems are usually used for directing collimated narrow infrared beams into the high speed 2-dimensional optic scanner. In this paper, a simple reflective infrared optic system with a 2-dimensionaloptic scanner is proposed for the realization of medical infrared thermography system. It has been experimentally proven that the infrared thermography system composed ofthe proposed optic system has the temperature resolution of $0.1{\circ}C$ under the spatial resolution of 1mrad, the image matrix size of $256{\times}240$, and the imaging time of 4 seconds.

• 한국통신학회논문지
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• 제14권2호
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• pp.95-107
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• 1989

본 논문에서는 효과적으로 VLSI화 하는데 적합한 모듈성, 규칙성, 병렬성 등을 가진 다차원 디지털 필터의 한 실현방법을 제안하였다. 이 방법은 Venetsanopoulos 등$^(10)$이 제안한 다차원 전달함수의 분해방법에 근거를 두어 다차원 다항식을 등가적인 2차원 다항식으로 취급할 수 있도록 하였으며, 변환된 2차원 다항식의 계수행렬을 삼각분해하여 다차원 전달함수를 1차원 전달함수들만의 곱 및 합으로 나타낼 수 있도록 하였다.

• Structural Engineering and Mechanics
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• 제42권3호
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• pp.425-448
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• 2012

In this paper, a new damage detection and quantification method has been presented to perform detection and quantification of structural damage under ambient vibration loadings. To extract modal properties of the structural system under ambient excitation, natural excitation technique (NExT) and eigensystem realization algorithm (ERA) are employed. Sensitivity matrices of the dynamic residual force vector have been derived and used in the parameter subset selection method to identify multiple damaged locations. In the sequel, the steady state genetic algorithm (SSGA) is used to determine quantified levels of the identified damage by minimizing errors in the modal flexibility matrix. In this study, performance of the proposed damage detection and quantification methodology is evaluated using a finite element model of a truss structure with considerations of possible experimental errors and noises. A series of numerical examples with five different damage scenarios including a challengingly small damage level demonstrates that the proposed methodology can efficaciously detect and quantify damage under noisy ambient vibrations.