BACKGROUND AND PURPOSE Acute stroke management requires minimization of prehospital time. This study addresses the value of helicopter transport compared with other means of transportation to a stroke unit and compares their rates of thrombolysis on a nationwide basis. METHODS Prospective data collection and prespecified evaluation of data from 32 stroke units between 2003 and 2009 were used....

Bighorn sheep (Ovis canadensis) herds have suffered recent declines across their previous range, and desert bighorn sheep (O. c. mexicana) are listed as an endangered species in New Mexico. One factor affecting growth rates of these populations is low and variable lamb recruitment. Capturing and radio-collaring lambs can provide opportunities for collecting valuable information on factors poten...

This paper deals with the problem of development of the mathematical model of a micro coaxial helicopter using hybrid method of analytical and experimental approach. An analytical mathematical model of micro coaxial helicopter has been derived with the consideration of dynamics of rotating parts to the rigid body dynamics. Pre-flight simulation was carried out based on the derived mathematical ...

BACKGROUND Air ambulance transport for injured patients is vitally important given increasing patient volumes, the limited number of trauma centres and inadequate subspecialty coverage in nontrauma hospitals. Air ambulance services have been shown to improve patient outcomes compared with ground transport in select circumstances. Our primary goal was to compare injuries, interventions and outco...

—In this paper an appropriate four rotors helicopter nonlinear dynamic model for identi cation and control law synthesis is obtained via modelization procedure where several phenomena are included like gyroscopic effects and aerodynamic friction. The numerical simulations of the model obtained show that the control law stabilizes the four rotors helicopter with good tracking.

This paper presents how to use feedback controller with helicopter dynamics state space model. A simplified analysis is presented for controller design using LQR of small scale helicopters for axial & forward flights. Our approach is simple and gives the basic understanding about how to develop controller for solving the stability of linear helicopter flight dynamics.

Image-based information is useful for a variety of autonomous vehicle applications such as obstacle avoidance, map generation, target tracking and motion estimation. Cameras are inexpensive and operate at a high temporal rate. This, coupled with advances in processing power, makes images-based techniques invaluable in autonomous systems operation. In this paper we propose and experimentally inv...

We develop a decentralized hybrid controller for fixed-wing UAVs assisting a manned helicopter in a United States Coast Guard search and rescue mission. The UAVs assist the manned helicopter by providing an expanded sensor footprint using onboard cameras. We consider two UAVs, one flying on either side of the helicopter, with constant velocity and maximum turn rate constraints. Tracking the hel...

The problem of searching for a walker that wants to be found, when the walker moves toward the helicopter when it can hear it, is an example of a two sided search problem which is intrinsically difficult to solve. Thomas et al [1] considered the effectiveness of three standard NATO search paths [2] for this type of problem. In this paper a genetic algorithm is used to show that more effective s...

THESIS This thesis done in cooperation with the MOVES Institute Approved for public release; distribution is unlimited. Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instruction, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of info...