• 대한기계학회논문집A
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• 제30권11호
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• pp.1348-1357
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• 2006

In a hybrid three-layer control architecture(deliberative, sequencing, and reflexive), the lowest reflexive layer consists of resources, actions, an action coordinator, and motion controllers. Because the execution of individual components in the reflexive layer should be done in real-time, each component has to be simple and, due to this reason, the Linux-RTAI(Real-Time Application Interface for Linux) has been used as an operating system. In this paper, a navigation control architecture, which combines the components in the reflexive layer and the navigation-related modules in the sequencing layer, is proposed. And then, as basic components, four actions(Goto, Avoid, Move, and EmergencyStop) are designed. Experimental results confirm the effectiveness of the proposed architecture and the performance of individual associated actions.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.888-891
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• 1991

In this paper, we have shown a new approach of neural networks for mobile robot motion control under an indoor refracted environment. The vehicle has two powered wheels and four passive casters which support a free motion. And it also uses sonar sensors, infrared sensors, Internal odometer, and contact sensors. Two experiments were conducted to demonstrate our objectives. The first one is that the vehicle executes a reflexive motor control to maintain a constant distance to the boundary. The second one is that as well as the boundary following, the vehicle makes a block obstacle avoidance during its path. Without prior knowledge of external environment. we have accomplished the tasks by employing a simple, reactive stimulus-response neural network scheme associating sensor data with the vehicle's action.

• 한국언어정보학회:학술대회논문집
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• 한국언어정보학회 1983년도 PROCEEDINGS OF THE SECOND JAPANESE-KOREAN JOINT WORKSHOP ON FORMAL GRAMMAR at KYOTO
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• pp.77-108
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• 1983

• 전자공학회논문지B
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• 제33B권9호
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• pp.1-12
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• 1996

In this paper, we propose an adaptive gait by which a quadruped walking robot can walk against external disturbances. This adaptive gait mechanism makes it possible for a quadruped walking robot to change its gait and accommodate external disturbances form various external environmental factors. Under the assumption that external disturbances can be converted to an external force acting on the body of a quadruped walking robot, we propose a new criterion for the stability margin of a waling robot by using an effective mass center based on the zero moment point under unknown external force. And for a solution of an adaptive gait against external disturbances, an method of altitude control and reflexive direction control is suggested. An algorithmic search method for an optimal stride of the quadruped mehtod, the gait stability margin of a quadruped walking robot is optimized in changing its direction at any instance for and after the reflexive direction control. To verify the efficiency of the proposed approach, some simulaton results are provided.

• 문화기술의 융합
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• 제10권6호
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• pp.533-544
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• 2024

본 연구는 러시아의 재귀통제와 중국의 삼전(三戰) 전략을 바탕으로 북한의 대남 인지전 수행 능력을 분석하고 그에 따른 시사점을 도출하는 것을 목적으로 한다. 인지전은 적의 인지 과정에 영향을 미쳐 의사결정을 왜곡시키는 새로운 형태의 전쟁으로, 최근 국제 분쟁에서 그 중요성이 부각되고 있다. 연구 결과, 북한은 러시아와 중국의 인지전 전략을 모방하여 사이버 공격, 심리전, 허위정보 유포 등 다양한 수단을 통해 대남 인지전을 수행할 능력과 의도가 있는 것으로 분석되었다. 이에 대한 대응방안으로 국가 차원의 전담조직 신설, 정보 수집 및 분석 강화, 국민 대상 교육 확대, 적극적 대응 전략 수립, 국제 협력 강화 등이 제시되었다. 본 연구는 북한의 인지전 위협에 대한 인식을 제고하고, 이에 대한 체계적인 대비의 필요성을 강조했다는 점에서 의의가 있다. 향후 더욱 구체적인 대응 방안 연구와 관련 정책 수립이 요구된다.

• 컴퓨터교육학회논문지
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• 제13권5호
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• pp.51-70
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• 2010

본 연구는 사이버 일탈행위와 사이버 일탈행위의 유발요인에 대한 영향 관계를 실증적으로 규명하여 실천적 정보통신윤리 교육 방안을 논의하고자 하였다. 이를 위해 문헌연구를 통해 사이버 일탈행위에 영향을 미치는 요인으로 자기조절력, 사회적 정체성, 주관적 규범 요인을 고려하였으며, 이 영향 요인에 대한 선행요인으로 인터넷 중독성, 익명성, 질서의식 및 정보규범 학습경험에 대한 요인을 투입하여 사이버 일탈행위에 관한 모델을 제시하였다. 연구 결과를 요약하면 다음과 같다. 첫째, 사이버 일탈행위와 그 영향요인에 대한 분석 결과 주관적 규범, 사회적 정체성, 자기조절력 순으로 사이버 일탈행위에 영향을 미치는 것으로 나타났다. 둘째, 부정적 관점의 주관적 규범에 대해 익명성(+), 질서의식(-), 정보규범 학습경험(-) 및 사회적 정체성(+)이 영향을 미치는 것으로 밝혀졌으며, 자기조절력에 대해 인터넷 중독성(+), 익명성(+) 모두 유의미한 영향을 미쳤다. 연구 결과, 실천을 강화하기 위해서는 반성과 성찰의 기회를 많이 주고, 비판적 사고와 책임윤리를 키우며, 공감능력을 계발하여 실천을 유도하여야 한다. 이를 지원하기 위한 전략적 교수-학습 절차로 '반성적 실천지향 정보통신윤리 교육 절차'를 제안하였다. 절차의 프레임워크는 문제인식-위험분석-자기성찰-실천과 평가에 대한 4단계로 구성되며, 순환적으로 반복되는 나선형 구조를 갖는다.

• East Asian mathematical journal
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• 제26권3호
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• pp.337-350
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• 2010

Strong convergence theorem of the explicit viscosity iterative scheme involving the sunny nonexpansive retraction for nonexpansive nonself-mappings is established in a reflexive and strictly convex Banach spaces having a weakly sequentially continuous duality mapping. The main result improves the corresponding result of [19] to the more general class of mappings together with certain different control conditions.

• 대한수학회보
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• 제33권4호
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• pp.603-611
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• 1996

Let consider the following problem: find an element u(t) in a Banach space U from the equation $$ x'(t) = Ax(t) + f(t,x(t)) + \Phi_0 u(t), 0 \leq t \leq T $$ with initial and terminal conditions $$ x(0) = 0, x(T) = \phi $$ in a Banach space X where $\phi \in D(A)$. This problem is a kind of control engineering inverse problem and contains nonlinear term, so that it is difficult and interesting. Thee proof main result in this paper is based on the Fredholm property of [1] in section 3. Similar considerations of linear system have been dealt with in many references. Among these literatures, Suzuki[5] introduced this problem for heat equation with unknown spatially-varing conductivity. Nakagiri and Yamamoto[2] considered the identifiability problem, which A is a unknown operator to be identified, where the system is described by a linear retarded functional differential equation. We can also apply to determining the magnitude of the control set for approximate controllability if X is a reflexive space, i.e., we can consider whether a dense subset of X is covered by reachable set in section 4.

• 대한수학회논문집
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• 제24권3호
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• pp.381-393
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• 2009

Strong convergence theorems on viscosity approximation methods for finding a common zero of a finite family accretive operators are established in a reflexive and strictly Banach space having a uniformly G$\hat{a}$teaux differentiable norm. The main theorems supplement the recent corresponding results of Wong et al. [29] and Zegeye and Shahzad [32] to the viscosity method together with different control conditions. Our results also improve the corresponding results of [9, 16, 18, 19, 25] for finite nonexpansive mappings to the case of finite pseudocontractive mappings.

• 대한수학회지
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• 제32권3호
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• pp.493-507
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• 1995

The Hartman-Stampacchia variational inequality was first suggested and studied by Hartman and Stampacchia [8] in finite dimensional spaces during the time establishing the base of variational inequality theory in 1960s [4]. Then it was generalized by Lions et al. [6], [9], [10], Browder [3] and others to the case of infinite dimensional inequality [3], [9], [10], and the results concerning this variational inequality have been applied to many important problems, i.e., mechanics, control theory, game theory, differential equations, optimizations, mathematical economics [1], [2], [6], [9], [10]. Recently, the Browder-Hartman-Stampaccnia variational inequality was extended to the case of set-valued monotone mappings in reflexive Banach sapces by Shih-Tan [11] and Chang [5], and under different conditions, they proved some existence theorems of solutions of this variational inequality.