As information visualization tools are used to visualize datasets of increasing size, there is a growing need for techniques that facilitate efficient navigation. Pan and zoom navigation enables users to display areas of interest at different resolutions. Focus+context techniques aim to overcome the drawbacks of pan and zoom by dynamically integrating areas of interest and context regions. To d...

This paper proposes a method for the visual-based navigation of a mobile robot in indoor environments, using a single omni-directional (catadioptric) camera. The geometry of the catadioptric sensor and the method used to obtain a bird’s eye (orthographic) view of the ground plane are presented. This representation significantly simplifies the solution to navigation problems, by eliminating any ...

For providing users with navigation aids that best serve their needs, user models for adaptive hypermedia should include user navigation patterns. This paper describes elements needed and how these elements can be gathered. 1 Navigation Strategies and Lostness in Hyperspace One of the most common problems in the field of hypermedia is that users tend to become disoriented: they lose one’s sense...

This paper first reviews conventional techniques for underwater vehicle navigation, and describes a dopplerbased navigation system recently implemented by the authors. Experimental results show that a system combining conventional long-baseline (LBL) acoustic navigation data with doppler navigation data provides superior navigation precision and update rates in comparison to raw LBL or doppler ...

OBJECTIVE Inefficient navigation in electronic health records has been shown to increase users' cognitive load, which may increase potential for errors, reduce efficiency, and increase fatigue. However, navigation has received insufficient recognition and attention in the electronic health record (EHR) literature as an independent construct and contributor to overall usability. Our aims in this...

BACKGROUND Computer-assisted spinal navigation allows for real time localization of surgical instruments in multiple views. Its use decreases radiation exposure and clears the surgical field of the C-arm fluoroscope. Despite these advantages, spinal navigation has yet to gain general acceptance among spine surgeons. The purpose of this study is to survey spine surgeons about their opinions on t...

An ultrasound (US) navigation system using global and local information is presented for transcatheter aortic stent deployment. The system avoids the use of contrast agents and radiation required in traditional fluoroscopically-guided procedures and helps surgeons precisely visualize the surgical site. To obtain a global 3D (three-dimensional) navigation map, we use magnetic resonance (MR) to p...