Peer-to-Peer(P2P)型ファイル共有ソフトウェアの利用によってもたらされる問題は，座視できない状況となっている．ネットワークの帯域の圧迫という問題もさることながら，Winnyなどのファイル共有ソフトウェアに感染する暴露ウイルスによる情報漏洩のリスクが深刻な問題となっている．多くの大学や企業では，P2Pファイル共有ソフトウェアの利用を禁止している．現実には，P2Pファイル共有ソフトの利用を制限することは困難である．結果，管理者はトラフィックを常時監視し，P2Pファイル共有ネットワークの存在を認識しなければならない．本稿では，P2P通信の検出作業に対する，トラフィックのマイニングと可視化による支援を提案する．管理者への支援という観点に立ち，トラフィックの可視化をおこなうトラフィックマイニングツールを開発した．また，試作環境での実験を通し，提案手法の有効性を検証した．

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In the present study an analytical examination was made of the influence of relative humidity on the activity of Oncomelania nosophora. The experiment was conducted in a room during the spring and summer months of 1956. The apparatus used is shown in Fig. 1. The snail is amphibious living in an irrigation ditch, in a moist grassland on the beach of a large river, or, in rare cases, in rice field. It appears from its habit as if the snail depends for its activity more or less on the relative humidity of the environment it lives in. However, the experiments showed that the snails were not invariably active when the relative humidity was high (97-100%), and that they were active, irrespective of a change in the relative humidity to some extent, so long as the touched surface of the shell was wet. It may be assumed that in nature the activity of the snail is arrested for want of moisture and is resumed as the touched surface of its shell becomes wet with rain or dew.

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A dichiral azobenzene mesogenic compound was found to exhibit the electric-induction of birefringence in the optically isotropic liquid phase. The anomalous emergence of the birefringence is attributed to the formation of the liquid-crystalline organization stabilized by the polar structure of the electrically-induced ferroelectric molecular assembly. The application of the in-plane electric field in the liquid phase produces a homogenous birefringent texture, which thus can be considered as a new type of light valve applicable for displays or switching devices. The electrically-induced birefringence can be erased by the irradiation of UV light, due to the photoinduced isomerization of the azobenzene compound, thus dual controlled birefringent structure, by the irradiation of light and/or by the application of the electric field, is obtained.

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The velocity of theα-βA transition was measured in two cases, i.e., whenα-crystals stayed in the saturated aqueous solution, and when they were left to stand in an air-bath at various temperatures ranging from 20°to 100°C. And it was deduced from the results of the measurement that this transition is due to the recrystallization ofα-crystals into theβ-form on the inner surfaces of the crystal and in the bulk of the solution, and the transition on the inner surfaces will be dominant, especially at the initial stage of the transition.

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