In this paper, we study the degrees of freedom (DoF) of the MIMO relay networks. We start with a general Y channel, where each user has Mi antennas and aims to exchange messages with the other two users via a relay equipped with N antennas. Then, we extend our work to a general 4-user MIMO relay network. Unlike most previous work which focused on the total DoF of the network, our aim here is to...

Minimally invasive surgery (MIS) constrains instrument motions to 4 DOF by precluding lateral motion at the incision. Robotic MIS systems can interpose arbitrary mappings between the surgeon’s motions at the master controller and the motions of instrument tips within the patient’s body. Our goal was to find the interface that was easiest to learn. We investigated the effects of different coordi...

Currently, full body exoskeletons still lack movability in their back and shoulder parts, resulting in limited applicability in, e.g., nursing care. An exoskeletal spine and shoulder mechanism called “exo-spine” has therefore been developed with the purpose of allowing 3 degree of freedom (DOF) spinal motion and 2 DOF shoulder girdle abduction. It consists of a mechanism of vertebras, shoulder ...

Nine Degrees of Freedom (9 DOF) systems are already in development in many areas. In this paper, an integrated pressure sensor is proposed that will make use of an already existing monolithic 9 DOF inertial MEMS platform. Capacitive pressure sensors can suffer from limited sensitivity for a given size of membrane. This novel pressure sensor design increases the sensitivity by over 5 times compa...

Although the depth-of-focus (DOF) has been investigated separately in the central retina and in the near retinal periphery, knowledge about their combined relative contribution to overall blur perception has remained unknown. In the present study, the DOF was measured psychophysically with a naturalistic pictorial stimulus as a function of spatial extent across the near retinal periphery under ...

Minimally invasive surgery (as previously discussed) is an operation technique advantageous for patients. However, surgeons have to contend with a number of disadvantages. With the development and commissioning of a robot supported, prototypic minimally invasive robotic surgery (MIRS) instrument the intracorporal manipulability as well as surgeon’s immersion will be enhanced. This paper will gi...

This study aims to investigate the effects of degree freedom (DOF) and weight hand exoskeleton (HE) on joint mobility function (ease movement, movement range) in fine use activities. A three-digit passive HE prototype was built fit each 12 participants. Two DOF setups (three DOF, two DOF), digits’ levels (70 g, 140 g), barehand conditions were tested. productivity task (performed with Standardi...

We establish the degrees of freedom (DoF) region for the multiple-input multiple-output (MIMO) two-transmitter, two-receiver (2× 2) interference network with a general message set, consisting of nine messages, one for each pair of a subset of transmitters at which that message is known and a subset of receivers where that message is desired. An outer bound on the general nine-message 2× 2 inter...

We explore the degrees of freedom (DoF) of three classes of finite state compound wireless networks in this paper. First, we study the multiple-input single-output (MISO) finite state compound broadcast channel (BC) with arbitrary number of users and antennas at the transmitter. In prior work, Weingarten et. al. have found inner and outer bounds on the DoF with 2 users. The bounds have a differ...

Master-slave active robot hands and endoscopes, which provide dexterous manipulations and wide views like human hands and eyes, are required to be constructed. We have previously developed a multi-DOF ultrasonic motor consisting of a spherical rotor and a bar-shaped stator. The rotor rotates around three perpendicular axes using three natural vibration modes of the stator. In this study, a mult...