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This paper proposes an improved maximum power point tracking (MPPT) method for the photovoltaic (PV) system using a modified particle swarm optimization (PSO) algorithm. The main advantage of the method is the reduction of the steady- state oscillation (to practically zero) once the maximum power point (MPP) is located. Furthermore, the proposed method has(More)
In this paper, we investigate various bifurcation and related dynamics of certain periodic attractors in a three-coupled oscillator system with hard type nonlinearity. The periodic attractors exist for comparatively large /spl epsiv/(=parameter showing the degree of nonlinearity), and they disappear via saddle-node (S-N) bifurcation when /spl epsiv/ becomes(More)
In this paper we investigate bifurcations of modes in threecoupled oscillators with hard and soft nonlinearity with the increase of parameter E, showing the degree of nonlinearity. The stability of modes in such a system for small E was already analyzed via averaging theory. Therefore, we start from the stable modes for small E, and increase E gradually to(More)
In this paper, we investigate pulse wave propagation phenomenon in a ring of a large number of coupled bistable oscillators. In particular, we focus our attention to such a practical condition that each oscillator has a slightly different intrinsic oscillation frequency in addition to noise. We elucidate numerically that the propagating pulse can be(More)
In this paper, we investigate quasi-periodic and periodic attractors constrained on the invariant subspace H in a ring of three coupled oscillators. In H two of three oscillators are synchronized. We elucidate the stability of the solution in H by calculating average largest transversal Lyapunov exponent, and find the stable region of periodic and(More)
We propose a method to self-organize a user model for realizing a text search system. The method self-organizes a model from phoneme sequences and their texts using 6 basic rules. An inference method associated with the self-organized model searches texts corresponding to inputted phoneme sequences. Experiments using 50 voice waveforms of 10 speakers show(More)