• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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• pp.176-181
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• 2000

Collision free task planning for dual-arm robot which perform many subtasks in a common work space can be achieved in two steps : path planning and trajectory planning. path planning finds the order of tasks for each robot to minimize path lengths as well as to avoid collision with static obstacles. A trajectory planning strategy is to let each robot move along its path as fast as possible and delay one robot at its initial position or reduce speed at the middle of its path to avoid collision with the other robot.

• 대한수학회지
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• 제32권2호
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• pp.311-319
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• 1995

Let $H$ be a separable, infinite dimensional, complex Hilbert space and let $L(H)$ be the algebra of all bounded linear operaors on $H$. A dual algebra is a subalgebra of $L(H)$ that contains the identity operator $I_H$ and is closed in the $weak^*$ topology on $L(H)$. Note that the ultraweak operator topology coincides with the $weak^*$ topology on $L(H)$ (see [5]).

• 대한수학회지
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• 제42권5호
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• pp.975-1002
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• 2005

On the setting of the upper half-space H of the Eu­clidean n-space, we show the boundedness of weighted Bergman projection for 1 < p < $\infty$ and nonorthogonal projections for 1 $\leq$ p < $\infty$ . Using these results, we show that Bergman norm is equiva­ lent to the normal derivative norms on weighted harmonic Bergman spaces. Finally, we find the dual of b$\_{$^{1}$.

• 대한수학회지
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• 제47권2호
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• pp.299-309
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• 2010

The Weyl group of a compact connected Lie group is a reflection group. If such Lie groups are locally isomorphic, the representations of the Weyl groups are rationally equivalent. They need not however be equivalent as integral representations. Turning to the invariant theory, the rational cohomology of a classifying space is a ring of invariants, which is a polynomial ring. In the modular case, we will ask if rings of invariants are polynomial algebras, and if each of them can be realized as the mod p cohomology of a space, particularly for dihedral groups.

• 충청수학회지
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• 제27권4호
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• pp.735-743
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• 2014

We obtain a splitting theorem which characterizes when a given space is a catesian product of an $H^f$-space, and also obtain a dual theorem for a co-$H^g$-space. Then we get Dula and Gottlieb's results as corollaries.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국제학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.513-518
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• 1993

In this paper, we consider the handling f a flexible object using dual-arm manipulators. We choose both the side arms as rigid, and the objects to be manipulated as flexible. Our purpose is to realize position control for the flexible object while suppressing its vibration. In particular, the problem taken up here is the stability of the control system while manipulating the object. We propose that the traditional approach to investigate the robot system be expanded to include the object's characteristics (thus transferring the stability of the robot system into the full assembly system). We define a handling characteristic while manipulating the object. Finally, the relationship between the handling characteristic and the positional constraint condition in the hold position of the arms is studied while considering the stability of the control system.

• International Journal of Aeronautical and Space Sciences
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• 제17권1호
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• pp.73-79
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• 2016

The characteristics of the SBAS satellite orbit and clock corrections are highly affected by the narrow network size in the Korean peninsula, which is expected to have an important role in the future dual frequency SBAS. The correlation between satellite corrections can be analyzed in terms of the spatial decorrelation effect which should be analyzed to keep the service area as wide as possible. In this paper, the characteristics of satellite error corrections for the potential Korean dual frequency SBAS were analyzed, and an optimal filter design approach is proposed to maximize the service area.

• Journal of Astronomy and Space Sciences
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• 제14권1호
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• pp.67-79
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• 1997

100GHz와 150GHz 대역의 두 수신기를 한 개의 냉각기로 운용하여 두 대역을 동시에 관측하기 위한 이중채널 수신기의 준광학계를 설계하였다. 준광학계를 위하여 가우시안 빔에 대한 일반적인 해석을 하였다. 이를 이용하여 대덕전파망원경인 카세그레인 안테나의 초점에 형성된 빔이 각 준광학 소자들을 통해서 믹서 전단에 있는 휘드혼에 최적 빔 결합되도록 준광학소자들 사이의 빔 파라미터를 결정하였다.

• Journal of international Conference on Electrical Machines and Systems
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• 제2권3호
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• pp.330-335
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• 2013

This paper performs two kinds of Field-Oriented Control (FOC) for dual three phase permanent magnet synchronous motor (DTP-PMSM).The first is based on vector space decomposition to study the effect of current harmonics on electromechanical energy conversion. And the second presents the coupling relations between two sets of windings using two d-q transformation. And then this paper has deeply studied the differences between these two strategies, the different effect on the control of harmonic current and the reason for these differences. MATLAB-based Simulation studies of a 3KW DTP-PMSM are carried out to verify the analysis of differences between the two FOC strategies.

• 한국통신학회논문지
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• 제38A권2호
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• pp.143-155
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• 2013

주파수 선택적 페이딩 환경에서 두 사용자가 OFDM 기법과 단일 안테나를 이용하여 기지국으로 동시에 신호를 전송할 때 다이버시티 이득을 효과적으로 얻고 다른 사용자의 간섭을 제거할 수 있는 기법을 제안한다. 이 기법은 기존의 주파수-공간 부호화 기법을 변형한 것으로 부분 간섭 제거 및 연속 간섭 제거 수신기를 통해 낮은 복잡도로 두 사용자의 신호를 복구할 수 있다. 주파수 다이버시티를 고려하지 않은 기존의 다중 전송 신호를 ZF 및 최대우도 기법으로 복호하는 기법과 비교하여 제안하는 기법의 우수한 성능을 모의실험을 통해 고찰하였다.