Open source, collectivism, and Japanese society

This paper is about collectivism in the Network Society. Many\ud researches about the Network Society evaluate collectivism, citing Japanese\ud culture and Hacker culture as good models of such collectivism. However, some\ud researchers, such as K. Abe in his analysis of “Seken,” criticize Japanese\ud collectivism. Abe’s study pointed out the negative effect of Japanese collectivism\ud on scientific progress. This paper will criticize Abe’s study and offer a new model\ud for evaluating collectivism, which has previously been evaluated in earlier studies\ud about the Network Society. First this paper introduces the previous studies and\ud considers a model of communication in the Network Society. Then this paper\ud considers the results of a survey of Japanese engineers in order to test the validity\ud and shortcomings of this model

Correlation functions for time-dependent calculation of linear-response functions

We emphasize the importance of choosing an appropriate correlation function to reduce numerical errors in calculating the linear-response function as a Fourier transformation of a time-dependent correlation function. As an example we take dielectric functions of silicon crystal calculated with a time-dependent method proposed by Iitaka et al. [Phys. Rev. E 56, 1222 (1997)].Comment: to be published in Phys.Rev.E 01 Dec 1997, 2 pages, 4 figures, more information at http://espero.riken.go.jp

Enhancement of entanglement transfer in a spin chain by phase shift-control

We study the effect of a phase shift on the amount of transferrable two-spin entanglement in a spin chain. We consider a ferromagnetic Heisenberg/XY spin chain, both numerically and analytically, and two mechanisms to generate a phase shift, the Aharonov-Casher effect and the Dzyaloshinskii-Moriya interaction. In both cases, the maximum attainable entanglement is shown to be significantly enhanced, suggesting its potential usefulness in quantum information processing.Comment: 7 pages, 5 figures. v2: a fig added, the main text modified a bi