This paper proposes a new family of four degrees-of-freedom (dof) parallel mechanisms with two platforms and its application to a footpad device that can simulate the spatial motions of the human foot. The new mechanism consists of front and rear platforms, and three limbs. Two limbs with 6-dof serial joints (P-S-P-P) are attached to each platform and are perpendicular to the base plate, while ...

The degrees of freedom (DoF) concept is very useful for studying the multi-user communications system at high signal-to-noise ratio region. The research on DoF leads to an important technology advancement in wireless communications, the interference alignment. The idea of interference alignment is to design the transmit signals structurally such that the interference signals from multiple inter...

Medical mannequins provide the first hands-on training for nurses and doctors and help eliminate human mistakes that would otherwise take place with a real person. The closer the mannequin is to mimicking a human being, the more effective the training; thus, additional features such as movable limbs and eyes, vision processing and realistic social interaction will provide a more fulfilling lear...

Depth of eld (DOF) is an important component of real photography. As such, it is a valuable addition to the library of techniques used in photorealistic rendering. Several methods have been proposed for implementing DOF e ects. Unfortunately, all existing methods require a great deal of computation. This prohibitive cost has precluded DOF effects from being used with any great regularity. This ...

A 3-degrees-of-freedom (DOF) bilateral haptic system can be modeled as an 2-port network where each port connects to a termination defined by 3 inputs and 3 outputs. The stability analysis of such systems is not trivial due to dynamic coupling across the different DOFs of the robots, the human operators, and the physical/virtual environments, and unknown dynamics of the human operators and the ...

In this paper, we consider the problem of the interference alignment for the K-user SISO interference channel with blind channel state information at transmitters (CSIT). Our achievement in contrast to popular K−user interference alignment (IA) scheme has more practical notions. In this case every receiver is equipped with one reconfigurable antenna which tries to place its desired signal in a ...

In a K-pair-user two-way interference channel (TWIC), 2K messages and 2K transmitters/receivers form a K-user IC in the forward direction (K messages) and another K-user IC in the backward direction which operate in full-duplex mode. All nodes may interact, or adapt inputs to past received signals. We derive a new outer bound to demonstrate that the optimal degrees of freedom (DoF, also known a...

The degrees of freedom (DoF) region of the two-user MIMO interference channel (IC) is completely characterized in the presence of noiseless channel output feedback from each receiver to its respective transmitter and with the assumption of delayed channel state information (CSI) at the transmitters. It is shown that having output feedback and delayed CSI at the transmitters can strictly enlarge...