RESUMEN
A small pufferfish, Torquigener albomaculosus, is known to construct an elaborate geometric circular structure, which has been referred to as a "mystery circle," with a diameter of ~2 m in the sand of the seabed. We reconstructed a 3D model of this structure for the first time using a "structure from motion" (SfM) algorithm. The mystery circle constructed by the pufferfish may have potential applications for biomimetics similar to the structures constructed by termites and prairie dogs. To support the significance of its structural characteristics, it was observed that the water passing through the valley upstream always gathers in the center of the structure, regardless of the direction of water flow. Furthermore, it has the function of extracting fine-grained sand particles from the valleys and directing these to the center. Computational fluid analysis can be performed immediately using the quantified 3D data, and the structural features of the mystery circle is expected to be applied in a wide range of fields, such as architecture and engineering, via biomimetics.
Asunto(s)
Tetraodontiformes , Algoritmos , Animales , Biomimética , ArenaAsunto(s)
Linfoma Anaplásico de Células Grandes , Linfoma Anaplásico Cutáneo Primario de Células Grandes , Neoplasias Cutáneas , Fosfatasas de Especificidad Dual/genética , Reordenamiento Génico , Humanos , Linfoma Anaplásico de Células Grandes/genética , Linfoma Anaplásico de Células Grandes/patología , Linfoma Anaplásico Cutáneo Primario de Células Grandes/patología , Fosfatasas de la Proteína Quinasa Activada por Mitógenos/genética , Neoplasias Cutáneas/genética , Neoplasias Cutáneas/patologíaRESUMEN
This paper presents a novel projected pixel localization principle for online geometric registration in dynamic projection mapping applications. We propose applying a time measurement of a laser projector raster-scanning beam using a photosensor to estimate its position while the projector displays meaningful visual information to human observers. Based on this principle, we develop two types of position estimation techniques. One estimates the position of a projected beam when it directly illuminates a photosensor. The other localizes a beam by measuring the reflection from a retro-reflective marker with the photosensor placed in the optical path of the projector. We conduct system evaluations using prototypes to validate this method as well as to confirm the applicability of our principle. In addition, we discuss the technical limitations of the prototypes based on the evaluation results. Finally, we build several dynamic projection mapping applications to demonstrate the feasibility of our principle.
RESUMEN
A Myxococcus xanthus cytoplasmic bacterial tyrosine kinase, BtkA, showed phosphorylation activity in the presence of Exo. Phosphorylated BtkA was expressed late after starvation induction and early after glycerol induction. The btkA mutant was unable to complete maturation to heat- and sonication-resistant spores under both starvation- and glycerol-induced developmental conditions.
