The response of a point object in cone beam spiral scan is analysed. Based on the result a sufficient condition for the spiral scan long object problem employing backprojection is formulated. By making use of the sufficient condition a general class of exact, backprojection based reconstruction algorithms for spiral scan cone beam CT is developed which are capable of reconstructing a sectional ...

The goal of MuSA is to create a robust and reliable system for recognizing and visualizing tonal patterns using the Spiral Array model for tonality [1]. This endeavor requires the developing of algorithms for abstracting and extracting pitch/time structures (see Figure 1) in music information. The resulting algorithms are fundamental tools for automated transcription, computer music analysis, c...

The slime mold Dictyostelium discoideum is one of the model systems of biological pattern formation. One of the most successful answers to the challenge of establishing a spiral wave pattern in a colony of homogeneously distributed D. discoideum cells has been the suggestion of a developmental path the cells follow (Lauzeral and coworkers). This is a well-defined change in properties each cell ...

Self-motion information influences spatially-specific firing patterns exhibited by hippocampal neurons. Moreover, these firing patterns can repeat across similar subsegments of an environment, provided that there is similarity of path shape and head orientations across subsegments. The influence of self-motion variables on repeating fields remains to be determined. To investigate the role of pa...

Calculating smooth trajectories of bounded curvature has received a very wide attention in the robotic literature of the last 40 years. Most results focus on the study of wheeled non-holonomic vehicles and are concerned with 2D path generation algorithms. The problem of smooth and least curvature 3D path planning is addressed with a variational approach and the general 3D Euler-Poisson equation...

Solutions of the 3D nonlinear induction equation for dynamos in spiral galaxies are presented in this paper. Our model includes diierential rotation, ambipolar diiusion and, based on small-scale turbulence, eddy diiu-sivity and the tensorial {eeect underlying magnetic feedback. The nonaxisymmetric radial-azimuthal spiral pattern and the vertical stratiication of the galaxy are represented in th...

A critical problem in planning sampling paths for autonomous underwater vehicles is balancing obtaining an accurate scalar field estimation against efficiently utilizing the stored energy capacity of the sampling vehicle. Adaptive sampling approaches can only provide solutions when real-time and a priori environmental data is available. Through utilizing a cost-evaluation function to experiment...