著者

広林 茂樹 田村 祐輔 山淵 龍夫 大薮 多可志

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌E(センサ・マイクロマシン部門誌) (ISSN:13418939)

巻号頁・発行日

vol.127, no.4, pp.258-259, 2007-04-01 (Released:2007-07-01)

参考文献数

7

被引用文献数

5 10

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In this paper, we monitored the electromagnetic waves generated by human activity. We investigated a monitoring system that used the bioelectric potential of a plant. Four subjects walked on the spot at a distance of 60 cm from a rubber tree and we measured the variation in the bioelectric potential of the tree produced by the stepping motion. The results confirmed that the electromagnetic waves generated by a person walking on the spot produced a measurable response in the bioelectric potential of a plant. It was also found that this variation in the bioelectric potential varied in synchrony with the subject's walking pace.

著者

広林 茂樹

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会論文誌. A, 基礎・境界 (ISSN:09135707)

巻号頁・発行日

vol.91, no.1, pp.153-161, 2008-01-01

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仮想的な市場モデルに基づいて,経済時系列の予測を行う研究は盛んに行われているが,実際の市場には様々な変動要因が存在するため,長期的な予測は難しい.しかし,経済学では景気循環論やエリオット波動に代表されるように,経済時系列の変動には短期的なものから長期的なものまで様々な周期性の存在が仮定されている.そこで,近年筆者が開発している新しい高分解能周波数解析法(NHA)を用いて,経済時系列の周期性の解析を行い,複合的な周期信号の組合せによって長期的な経済時系列の予測を試みた.検証実験では,過去15年間程度の日経平均株価終値のデータにおいて,過去2年間程度の分析窓長でNHAによる解析を行い,その後2年間の価格変動を予測した.また,本手法における予測可能時期を推定するため,この15年間から学習期間のためのはじめ2年間と評価のための終わりの2年間をそれぞれ除いた約11年間の区間において,予測結果の検証を行った.アジア通貨危機とアメリカ同時多発テロ事件など,世界的に大きな事件が発生している時期付近では予測誤差が大きくなるものの,それ以外の期間ではおおむね変動の概略をとらえることができた.

著者

広林 茂樹 田村 祐輔 山淵 龍夫 大薮 多可志

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌E(センサ・マイクロマシン部門誌) (ISSN:13418939)

巻号頁・発行日

vol.127, no.4, pp.258-259, 2007

被引用文献数

5 10

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In this paper, we monitored the electromagnetic waves generated by human activity. We investigated a monitoring system that used the bioelectric potential of a plant. Four subjects walked on the spot at a distance of 60 cm from a rubber tree and we measured the variation in the bioelectric potential of the tree produced by the stepping motion. The results confirmed that the electromagnetic waves generated by a person walking on the spot produced a measurable response in the bioelectric potential of a plant. It was also found that this variation in the bioelectric potential varied in synchrony with the subject's walking pace.

著者

新保 達也 大薮 多可志 広林 茂樹 竹中 幸三郎

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. E, センサ・マイクロマシン準部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A publication of Sensors and Micromachines Society (ISSN:13418939)

巻号頁・発行日

vol.124, no.12, pp.470-475, 2004-12-01

被引用文献数

5 11 2

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The bioelectric potential of a foliage plant changes according to an occupant's behavior, for example entering the room in which the plant is installed, as well as watering and touching the plant. The potential shows the impulse responses due to the behaviors. In this study, the integrated values of the bioelectric potential were adopted to identify those behaviors. There are two types of values. Those were derived by integrating the bioelectric potential characteristics for a minute (<i>v</i>_<i>m1</i>) and for an hour (<i>v</i>_<i>h1</i>) respectively. The histogram of the values <i>v</i>_<i>m1</i> for the steady state perfectly took a normal distribution. The frequencies of <i>v</i>_<i>m1</i> for the behaviors were different compared with the steady state distribution. The system can identify the behaviors by examining the frequency table of <i>v</i>_<i>m1</i>. Conversely, it is thought the plant gives us some suggestions using bioelectric potential characteristics. A clue for communication between humans and plants was also obtained. The <i>v</i>_<i>h1</i> becomes higher as the average room temperature (<i>t</i>_<i>r</i>) becomes lower. There was a negative correlation between <i>v</i>_<i>m1</i> and <i>t</i>_<i>r</i>. There were two groups in the scatter diagram of the variables <i>v</i>_<i>m1</i> and <i>t</i>_<i>r</i>.