Katsuhiro Nishinari

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We report experimental results on unidirectional trafficlike collective movement of ants on trails. Our work is primarily motivated by fundamental questions on the collective spatiotemporal organization in systems of interacting motile constituents driven far from equilibrium. Making use of the analogies with vehicular traffic, we analyze our experimental(More)
Traffic-like collective movements are observed at almost all levels of biological systems. Molecular motor proteins like, for example, kinesin and dynein, which are the vehicles of almost all intra-cellular transport in eukayotic cells, sometimes encounter traffic jam that manifests as a disease of the organism. Similarly, traffic jam of collagenase MMP-1,(More)
We study discretisation effects in cellular automata models for pedestrian dynamics by reducing the cell size. Then a particle occupies more than one cell which leads to subtle effects in the dynamics, e.g. non-local conflict situations. Results from computer simulations of the floor field model are compared with empirical findings. Furthermore the(More)
We investigate the organization of traffic flow on preexisting uni-and bidirectional ant trails. Our investigations comprise a theoretical as well as an empirical part. We propose minimal models of uni-and bi-directional traffic flow implemented as cellular automata. Using these models , the spatio-temporal organization of ants on the trail is studied.(More)
Speech communication has several steps of production, encoding, transmission, decoding, and hearing. In every step, acoustic distortions are involved inevitably as differences of vocal tract length, gender , age, microphone, room, line, hearing characteristics, etc. These are static non-linguistic factors and completely irrelevant to speech recognition.(More)
In this paper, we propose a new approach for pedestrian dynamics. We call it a Real-coded Cellular Automata (RCA). The scheme is based on the Real-coded Lattice Gas (RLG), which has been developed for fluid simulation. Similar to RLG, the position and velocity can be freely given, independent of grid points. Our strategy including the procedure for updating(More)
Motivated by experiments on single-headed kinesin KIF1A, we develop a model of intracellular transport by interacting molecular motors. It captures explicitly not only the effects of adenosine triphosphate hydrolysis, but also the ratchet mechanism which drives individual motors. Our model accounts for the experimentally observed single-molecule properties(More)
Generically, in models of driven interacting particles the average speed of the particles decreases monotonically with increasing density. We propose a counterexample , motivated by the motion of ants in a trail, where the average speed of the particles varies non-monotonically with their density because of the coupling of their dynamics with another(More)