• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.383-383
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• 2000

In this paper, a motion adaptation control is applied for animation of 3-D human character. The method includes parameterization of joint motion data, motion adaptation based on body ratio of character, dynamic adaptation using genetic algorithm, etc. The feasibility of motion adaptation technique is verified by applying to motion control and adaptation of a 3-D human character.

• 한국컴퓨터정보학회논문지
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• 제24권4호
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• pp.45-50
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• 2019

Recently, character motion have been used extensively in the entertainment business, and researchers have investigated algorithms of reproducing, editing, and simulating mimic human movements. Also, many recent researches have suggested how a character interacts with its surrounding environment in terms of motion. Specially, spatial relationships of the environment have been introduced for adapting and preserving character motion. In this paper, we propose a motion adaptation technique preserving a spatial property between a virtual character and the configuration of its surrounding space. Additionally, we report on experimental results of smoothly adapted motions in various environmental structures with original motions such as walk, jump, and tumbling.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.43-44
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• 2006

The performance of the direct adaptive time-delay filter depends on the select time-delay. In this paper, the authors introduce a new scheme to adapt the time-delay which is to be used in conjunction with the direct adaptive command shaping for the improved vibration suppression in flexible motion system. In order to formulate the time-delay adaptation scheme, the authors have analyzed the effect of the time-delay value on the performance of the direct adaptive command shaping filter. By modifying the direct adaptation formula based on the analysis result the authors have established a set of equations to adapt the time-delay toward the optimal value. Simulation results show the effectiveness of the proposed time-delay adaptation approach for the improved vibration suppression.

• 인지과학
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• 제10권3호
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• pp.29-37
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• 1999

Murakami와 Cavanagh (1998a.b. 1999)가 보고한 무선 운동 영역 순응에 따른 정지된 인접 영역의 흔들림(jittering) 착시현상을 새로운 자극구성으로 검증하였다. 이 현상에 대한 설명으로 이 연구자들이 제안한 순응에 따른 안구운동 보상기제의 약화를 최소화하는 역 위상 깜박임(counterphase flickering)에의 순응과 코사인 패턴을 사용하였을 때에도 정지된 인접 영역에서의 착시현상이 경험되었다. 그러나, 이 자극 상황에서 관찰된 착시현상은 평면상의 흔들림이 아니라 정지된 인접 영역이 관찰자에서 멀어지는 것으로 지각되는 3차원상의 운동잔여효과(3D motion aftereffect)이었다. 본 연구에서 우리는 이 새로운 현상이 깜박임 영역의 휘도 대비감소(contrast reduction)가 정지된 인접 영역과의 지각된 깊이 차이를 유발시키고 깜박임 영역이 정지하였을 때 원래의 깊이로 복원하는 과정에서 정지된 인접 영역이 상대적으로 멀어지며 움직이는 것으로 지각되는 것에 기인했을 가능성을 조사하였다. 깊이 단서를 제거하거나, 휘도 대비감소를 최소화하는 고 공간주파수 코사인 패턴을 사용한 실험의 결과 관찰된 운동잔여효과의 소멸은 이 가능성을 강력히 지지하여 주었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.75.3-75
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• 2002

1. introduction 2. Related Work 3. Overview of the Avatar Control System 4. A Hybrid Control Method 5. Motion Conversion 6. Experimental result and Conclusion References

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.301-303
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• 2007

This paper presents user adaptation methods to overcome limitations of a user-independent model and a user-dependent model in a Korean sign language recognition system. To adapt model parameters for unobserved states in hidden Markov models, we introduce new methods based on motion similarity and prediction from adaptation history so that we can achieve faster adaption and higher recognition rates comparing with previous methods.

• 한국산학기술학회논문지
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• 제10권4호
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• pp.736-739
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• 2009

영상 내의 움직임 적응적인 효과적인 무손실 영상 압축 알고리즘을 제안한다. 이 알고리즘은 비선형 예측기를 토대로 움직임에 적응하는 단계와, 예측기에 의한 차분 데이터를 압축하는 단계로 구성된다. 제안한 비선형 예측기는 과거의 예측 오차로부터 화면간 혹은 화면내 예측치를 선택하며, 움직임 적응 단계를 진행되면서 주변 화소들의 예측 오차를 고려하여, 현재 화소에 대한 예측 오차를 줄이는 능력을 가진다. 예측 오차는 기존의 문맥 적응적인 코딩 기법에 의해서 압축된다. 실험결과는 제안한 알고리즘이 FELICS, CALC, JPEG-LS와 같은 문맥 모델링에 기반을 둔 무손실 압축 기법보다 우수한 압축률을 보여준다.

• 제어로봇시스템학회논문지
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• 제14권6호
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• pp.564-572
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• 2008

The performance of the direct adaptive time-delay command shaping filter depends on the select time-delay. In the previously introduced direct adaptive command shaping filter, however, the time-delay value is fixed and only the magnitudes of the impulses are learned. In this paper, the authors introduce a new scheme to adapt the time-delay which is to be used in conjunction with the direct adaptive command shaping for the improved vibration suppression in flexible motion system. In order to formulate the time-delay adaptation scheme, the authors have analyzed the effect of the time-delay value on the performance of the direct adaptive command shaping filter. By modifying the direct adaptation formula based on the analysis result the authors have established a set of equations to adapt the time-delay toward the optimal value. Simulation results show the effectiveness of the proposed time-delay adaptation approach for the improved vibration suppression.

• 소음진동
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• 제9권1호
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• pp.33-41
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• 1999

This paper presents a method of actively controlling the interior noise by a trim panel with hybrid feedforward-feedback control loop. The control technique is designed to minimize the vibration of panel whose motion is limited to that of a piston (out-of-plane motion). The hybrid controller consists of an adaptive feedforward controller in conjunction with a linear quadratic Gaussian (LQG) feedback controller. In order to maintain control performance of both persistent and transient disturbances, the feedback loop speeds up the adaptation rate of feedforward controller by improving damping capacity of secondary plant related with the adaptation rule. Numerical simulation and experimental result indicate that the hybrid controller is a more effective method for reducing the vibration of the panel (and therefore the interior noise) compared to using feedforward controller.

• Wind and Structures
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• 제14권6호
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• pp.537-557
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• 2011

While there are a number of guidelines used throughout the world in the assessment of acceptability of tall building accelerations, none are based on systematically conducted surveys of occupant reaction to wind-induced motion. In this study, occupant response data were gathered by both a self-reporting mechanism and by interviewer-conducted surveys in control tower structures over a period of four years. These two approaches were designed in conjunction with experimental psychologists to ensure unbiased reporting. The data allowed analysis of perception thresholds and tolerability at different building frequencies and in different wind climates. The long-term nature of the studies also allowed an investigation of the causes and effects of adaptation to building motion. As the surveys were designed to allow multiple use during single storms, the effects of exposure duration were investigated. A final exit survey was conducted at the primary survey location to investigate views of the acceptability of wind-induced motion and the factors underlying these views. The findings of the field studies indicate that none of the currently used acceleration guidelines address all of the factors that contribute to occupant dissatisfaction. An alternative framework for assessing acceleration acceptability is proposed.