Showing papers presented at "International Symposium on Theoretical Aspects of Computer Software in 2007"
01 Jun 2007
TL;DR: Takagi et al. as discussed by the authors presented the Indecisive behavior of amoeba crossing an environmental barrier at the 2006 International Symposium on Topological Aspects of Critical Systems and Networks.
Abstract: Title Indecisive behavior of amoeba crossing an environmental barrier Author(s) Takagi, S.; Nishiura, Y.; Nakagaki, T.; Ueda, T.; Ueda, K.-I. Citation Topological Aspects of Critical Systems and Networks : Proceedings of the International Symposium: 86-93 Issue Date 2007-06 Doc URL http://hdl.handle.net/2115/40062 Type proceedings (author version) Note International Symposium on "Topological Aspects of Critical Systems and Networks". 13-14 February 2006. Hokkaido University, Sapporo, JAPAN. File Information nishiura-15.pdf
15 citations
01 Jun 2007
TL;DR: In this paper, the authors investigated the economic vitalization of two different community currencies (CCs) and found that the amount of transactions (payments and receipts) of the two CCs was distributed according to a power-law distribution with a unity rank exponent.
Abstract: that are already known to follow it. These phenomena have re-cently been discovered within the transaction amount (payments or receipts)distributions within two different Community Currencies (CC) that had beeninitiated as social experiments. One is a local CC circulating in a specific geo-graphical area, such as a town. The other is a virtual CC used among memberswho belong to a certain community of interest (COI) on the Internet. We con-ducted two empirical studies to estimate the economic vitalization effects theyhad on their respective local economies. The results we found were that theamount of transactions (payments and receipts) of thetwo CCs was distributedaccording to a power-law distribution with a unity rank exponent. In addition,we found differences between the two CCs with regard to the shapes of theirdistribution over a low-transaction range. The result may originate from thedifference in methods of issuing CCs or in the magnitudes of the minimum-value unit; however, this result calls for further investigation.
1 citations
01 Jun 2007
TL;DR: In this article, a lognormal distribution well fits to the entire region for masticated food fragments for a small number of chewing strokes, and the tail of the fragmentsize distribution changes from the LDA to a power-law one as the chewing stroke number increases.
Abstract: Long-tailed distributions in biological systems have been studied. First, we found that lognormal distributions show excellent fit with various data for the duration distribution of disability in aged people, irrespective of their severity and gender. The robust lognormal distribution of disability implies that the incidence of diseases can be completed by many independent subprocesses in succession. Next, we studied food fragmentation by human mastication. A lognormal distribution well fits to the entire region for masticated food fragments for a small number of chewing strokes. Furthermore, the tail of the fragmentsize distribution changes from the lognormal distribution to a power-law one as the chewing stroke number increases. The good data fitting by the lognormal and power-law distribution implies that two functions of mastication, a sequential fragmentation with cascade and randomness and a lower threshold for fragment size, may affect the size distribution of masticated food fragments.
01 Jun 2007
TL;DR: Based on the obtained fractal geometry, pore size distribution and ρ, it was concluded that fractal body was closer to Menger sponge (fractal dimension D = 2.73) at the 7th generation.
Abstract: Fractal body, a porous silica with cross-sectional fractal dimension Dcs = 1.87 was created by a sol-gel reaction of tetramethyl orthosilicate (TMOS) using unique template particles. Dcs was maintained over ca. three decades in pore size from 0.05 30 μm and its density ρ = 0.35 g·cm−3. Based on the obtained Dcs, pore size distribution and ρ, it was concluded that its fractal geometry was closer to Menger sponge (fractal dimension D = 2.73) at the 7th generation, a mathematical model of fractal body. Our experimental strategy would allow us to design fractality of porous materials in real space.