巻号一覧
18 巻, 5 号
選択された号の論文の5件中1～5を表示しています
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滝本 隆, 山本 茂2005 年 18 巻 5 号 p. 165-170
発行日: 2005/05/15
公開日: 2011/10/13
ジャーナル フリーGenerally, limitations of human accuracy in manual manipulation hinder the quality of work performed by human operators of manual control systems. In a system controlled by manual manipulation, unnecessary vibration in the system caused by the movements of the operator is undesirable. Therefore, effective suppression of undesired motion is required to enhance the accuracy of control systems. In this paper, we show that additional feedback control based on a delayed feedback mechanism is effective to suppress harmful oscillatory motions in such systems.抄録全体を表示PDF形式でダウンロード (953K) -
最小相互エントロピー原理に基づくBurg法の拡張中室 健, 和田 光代, 杉本 末雄2005 年 18 巻 5 号 p. 171-177
発行日: 2005/05/15
公開日: 2011/10/13
ジャーナル フリーA novel Auto Regressive (AR) model parameter estimation method is proposed, which can utilize a prior information as well as time series data, by extending the Burg method on the basis of the Minimum Cross Entropy (MCE) principle. As a practical application of the proposed method, we consider an approach to spectral estimation of speech data. In general, effectiveness of a prior information to spectral estimation results depends on the variation of speech signal. Thus we introduce an algorithm to determine the usage of a prior information, based on the divergence measure defined by the Kullback information. Finally, the estimation results for real speech data illustrate improved performance in comparison to the Burg method.抄録全体を表示PDF形式でダウンロード (1497K) -
ジャーファー アルムタワ, 田中 秀幸, 片山 徹2005 年 18 巻 5 号 p. 178-186
発行日: 2005/05/15
公開日: 2011/10/13
ジャーナル フリーThis paper considers an improvement of estimates of a state space model obtained by subspace system identification methods via the EM algorithm in the presence of observation outliers. To initialize the EM algorithm the initial estimates are obtained by two subspace identification methods : MOESP [1] and ORT [2]. The E- and M-steps in the EM algorithm are calculated when outliers are detected, by computing the conditional expectation under the assumption that the output data is incompletely observed. The outliers are detected and deleted in the EM algorithm by a simple scheme in robust statistics by using the median of the residuals, which are defined as the difference between the observed outputs and the estimated outputs computed from the initial estimates by subspace methods. Numerical examples show that the EM algorithm can monotonically improve the initial estimates obtained by subspace identification methods.抄録全体を表示PDF形式でダウンロード (1221K) -
回帰ベクトルが周期的でない場合北村 亘, 藤崎 泰正2005 年 18 巻 5 号 p. 187-189
発行日: 2005/05/15
公開日: 2011/10/13
ジャーナル フリーPDF形式でダウンロード (404K) -
宮里 義彦2005 年 18 巻 5 号 p. 190-192
発行日: 2005/05/15
公開日: 2011/10/13
ジャーナル フリーPDF形式でダウンロード (438K)
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