著者

巻口 誉宗 井上 純一

出版者

The Society of Instrument and Control Engineers

雑誌

計測自動制御学会論文集 = Transactions of the Society of Instrument and Control Engineers (ISSN:04534654)

巻号頁・発行日

vol.46, no.11, pp.666-675, 2010-11-30

被引用文献数

3

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In real flocks, it was revealed that the angular density of nearest neighbors shows a strong <i>anisotropic structure</i> of individuals by very recent extensive field studies [Ballerini <i>et al</i>, <i>Proceedings of the National Academy of Sciences USA</i>, <b>105</b>, pp. 1232-1237 (2008)]. In this paper, we show this structure of anisotropy also emerges in an artificial flock simulation, namely, <i>Boid simulation</i>. To quantify the anisotropy, we evaluate a useful statistics, that is to say, the so-called γ-value which is defined as an inner product between the vector in the direction of the lowest angular density of flocks and the vector in the direction of moving of the flock. Our results concerning the emergence of the anisotropy through the γ-value might enable us to judge whether an optimal flock simulation seems to be <i>realistic</i> or not.