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Notes on K\"{a}hler surfaces with distinct constant Ricci eigenvalues
Terumasa Nihonyanagi,Takashi Oguro,Kouei Sekigawa 대한수학회 2003 대한수학회지 Vol.40 No.6
In this paper, we study a connected, simply connected homogeneousK surface with distinct constant Ricci eigenvalues, andspecify the local structure of them.
NOTES ON THREE-DIMENSIONAL WEAKLY SYMMETRIC SPACES
Kurashima, Kazuo,Oguro, Takashi,Sekigawa, Kouei Korean Mathematical Society 1999 대한수학회보 Vol.36 No.3
In the present paper, we describe the action of isometry groups of 30dimensional weakly symmetric spaces and classify 3-dimensional connected weaky symmetric spaces. Further, we determine 3-dimensional weakly symmetric spaces in terms of the eigen- values of the Ricci transformation.
NOTES ON KAHLER SURFACES WITH DISTINCT CONSTANT RICCI EIGENVALUES
Nihonyanagi, Terumasa,Oguro, Takashi,Sekigawa, Kouei Korean Mathematical Society 2003 대한수학회지 Vol.40 No.6
In this paper, we study a connected, simply connected homogeneous Kahler surface with distinct constant Ricci eigenvalues, and specify the local structure of them.
A Feedback Control for a Feel Regeneration System with Linear Slider
Yusuke Nakagawa,Ryuichi Oguro,Takashi Yoshimura 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In this paper, we present the feel regeneration system that uses a linear motor, and propose the feedback control system based on disturbance observer for generating the reaction force from object things. The proposed feel regeneration system consists of the linear slider and the sensing stage that is connected with the base by spring elements. In addition, we can get optical reactive force by controlling the stretch of the spring, which is a cause of producing the reactive force, and we recognize it as a feeling. In particular, the feel that the stage moves without adding the power, i.e., the regeneration of a feeling of the friction-less is the base technology of such a system, and we call this feeling the one like pushing air. The feedback controller realizes this friction-less feeling with the use of disturbance observer, which is proposed in order to estimate and cancel the friction force. The proposed control algorism and the system are experimentally verified by results of simulation.