This paper investigates the degrees of freedom (DoF) of the L-cluster, K-user MIMO multi-way relay channel, where users in each cluster wish to exchange messages within the cluster, and they can only communicate through the relay. A novel DoF upper bound is derived by providing users with carefully designed genie information. Achievable DoF is identified using signal space alignment and multipl...

Vocal movement isn't only a movement of the vocal organs. It is also a movement that produces acoustic signals received by hearing as linguistic information through hydroacoustic phenomena along with the formation of the vocal way. The purpose of this research is to make clear the human vocal mechanism from the view of engineering by simulating the vocal movement with a robot, and to create the...

Endoscopes for industrial and medical fields are expected to have multi degree-of-freedom (DOF) motions. A multi-DOF ultrasonic motor we developed consists of a spherical rotor and a bar-shaped stator, and the rotor rotates around three perpendicular axes using three natural vibration modes of the stator. In this study, a multi-DOF unilateral master-slave system for active endoscope using the m...

In this paper, an application of the dynamics and control of redundant robotic systems is presented in order to investigate the feasibility of functional electrical stimulation assisted arm-free standing for paraplegics. Through the inverse dynamics analysis of a three dimensional dynamic model of quiet standing, several sets of the minimum number of degrees of freedom (DOF) such that there are...

An outer bound for the degrees of freedom (DoF) region of the K-user multiple-input single-output (MISO) broadcast channel (BC) is developed under the hybrid channel state information at transmitter (CSIT) model, in which the transmitter has instantaneous CSIT of channels to a subset of the receivers and delayed CSIT of channels to the rest of the receivers. For the 3-user MISO BC, when the tra...

This paper generalizes the Time Domain Passivity Control concept originally introduced by J.-H. Ryu et al. (2004) in order to work for multi-degree of freedom (DoF) haptic systems with time delay. Its energy computation (named passivity observer) factors in the phase shift caused by time delay, and is improved by an energy estimation. Moreover, the variable damping of the passivity controller i...

A new series of organic light emitting copolymers, poly(dioctyl fluorene -co diphenyl oxadiazole)s P(DOFDPO), are reported in this paper. We found organic polymer light emitting devices with comparable device efficiency and more saturated blue color based on this new series of copolymers with less than 10% DPO moiety when compared with poly(dioctyl fluorene) P(DOF) devices. The device structure...

In recent years, degree-of-freedom (DoF) based models were proven to be very successful in studying MIMObased wireless networks. However, most of these studies assume channel matrix is of full-rank. Such assumption, although attractive, quickly becomes problematic as the number of antennas increases and propagation environment is not close to ideal. In this paper, we address this problem by dev...

A multi-degree of freedom (multi-DOF) ultrasonic motor is anticipated as an actuator for the next generation because it can drive three-DOF motion with high torque and low noise. Before a multi-DOF ultrasonic motor can be used as a servomotor in actual robots, we have to develop a proper pre-loading mechanism and control algorithm for quick multi-DOF motion. This paper proposes a pre-loading me...