We present a six degrees of freedom tracking system, which is wireless and scalable concerning the tracking volume and the number of devices being tracked. This is achieved by the modular design of the system consisting of two different types of modules: an arbitrary number of tracked user modules and a number of fixed reference modules. It provides a flexible setup for head tracking in virtual...

We present a rigorous electromagnetic formalism for defining, evaluating, and optimizing the degrees of freedom of an optical system. The analysis is valid for the delivery of information with electromagnetic waves under arbitrary boundary conditions communicating between domains in three-dimensional space. We show that, although in principle there is an infinity of degrees of freedom, the effe...

The course on Mechanical Vibration is an important part of the Mechanical Engineering undergraduate curriculum. It is necessary for the development and the performance of many modern engineering products: automobiles, jet engines, rockets, bridges, electric motors, electric generators, and so on. Whenever a mechanical system contains storage elements for kinetic and potential energies, there wi...

OBJECTIVE To understand the needs and health profile of men incarcerated in the Pau dos Ferros Regional Criminal Complex (Rio Grande do Norte, Brazil). METHODOLOGY Quanti-qualitative research conducted with 30 men incarcerated in November 2012. Semi-structured interviews were the primary data collection method. Descriptive statistics and thematic analysis of the speeches were used for data an...

The Data Management System (DMS) is the information and communications system on-board Space Station Freedom. Extensive modeling of the DMS is being conducted throughout NASA to aid in the design and development of this vital system. In this paper we discuss activities at NASA Ames Research Center to model the DMS network infrastructure, focusing on modeling of the Fiber Distributed Data Interf...

Vertical dynamics modeling and simulation of a six-wheel unmanned military vehicle (MULE) studied in this paper. The Common Mobility Platform (CMP) chassis provided mobility, built around an advanced propulsion and articulated suspension system gave the vehicle ability to negotiate complex terrain, obstacles, and gaps that a dismounted squad would encounter. Aiming at modeling of vehicle vertic...

The goal of our research project is to establish a type-based method for verification of certain critical properties (such as deadlockand race-freedom) of operating system kernels. As operating system kernels make heavy use of threads and interrupts, it is important that the method can properly deal with both of the two features. As a first step towards the goal, we formalize a concurrent calcu...

H∞ controller for active magnetic bearings (AMBs) with flexible rotor system was designed in this paper. The motion equations of AMBs and flexible rotor system are built based on finite element methods (FEM). Weighting function matrices of H∞ controller for AMBs are studied for both the sensitivity and the complementary sensitivity of H∞ control theory. The simulation shows that the H∞ control ...