New low-cost commercially available bottom-lock doppler sonars can augment or replace the acoustic timeof-flight navigation systems commonly employed for threedimensional underwater robot vehicle navigation. This paper first reviews conventional techniques for underwater vehicle navigation, and describes a doppler-based navigation system recently developed by the authors. Second, we identify pr...

This study investigates the pros and cons of flocking in longrange “migration” of mobile robot swarms under the influence of different factors. We present a flocking behavior consisting of three simple behaviors: heading alignment, proximal control, and alignment to the desired homing direction. The behavior drives a flock of robots from one location to another by sensing the magnetic field of ...

During locomotion we can use information in the retinal flow field to judge whether we will pass to the left or right of an object in the scene (heading). We can also use information in retinal flow to judge whether an object is moving relative to the scene (flow parsing). Both judgements rely on the brain identifying optic flow (global patterns of retinal motion that are characteristic of self...

Abstract When the aircraft does high maneuvers at a attack angle, rapid transition of flight state induces series complex flow phenomena such as separation and vortex breakdown, leading to uncommanded motions self-excited roll oscillation, which brings great danger aircraft. Therefore, it is important investigate mechanism this phenomenon suppress it. In paper, numerical method based on Lattice...

This paper presents an algorithm for calibrating strapdown magnetometers in the magnetic field domain. In contrast to the traditional method of compass swinging, which computes a series of heading correction parameters and, thus, is limited to use with two-axis systems, this algorithm estimates magnetometer output errors directly. Therefore, this new algorithm can be used to calibrate a full th...

Stem cell therapies offer great potentials in the treatment for a wide range of diseases and conditions. With so many stem cell replacement therapies going through clinical trials currently, there is a great need to understand the mechanisms behind a successful therapy, and one of the critical points of discovering them is to track stem cell migration, proliferation and differentiation in vivo....

Small-angle scattering (SAS) has witnessed a breathtaking renaissance and expansion over the past 15 years regarding the determination of biomacromolecular structures in solution. While important issues such as sample quality, good experimental practice and guidelines for data analysis, interpretation, presentation, publication and deposition are increasingly being recognized, crucial topics su...

The vehicle positioning system can be utilized for various automotive applications. Primarily focusing on practicality, this paper presents a new method for vehicle positioning systems using low-cost sensor fusion, which combines global positioning system (GPS) data and data from easily available in-vehicle sensors. As part of the vehicle positioning, a novel nonlinear observer for vehicle velo...