電気学会論文誌C(電子・情報・システム部門誌)
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
135 巻 , 1 号
選択された号の論文の25件中1~25を表示しています
特集:インタフェース関連アナログ電子回路技術
巻頭言
特集論文
<電気回路・電子回路>
特集研究開発レター
<電気回路・電子回路>
論文
<情報通信工学>
  • 木許 雅則, 浅見 卓也
    2015 年 135 巻 1 号 p. 37-44
    発行日: 2015年
    公開日: 2015/01/01
    ジャーナル 認証あり
    In multichannel acoustic echo canceler based on linear combination, the uniqueness problem exists that adaptive filter's can't identify the correct echo-paths due to highly cross-correlated multichannel input signals. Pre-processing for input signal are good candidates for solving this problem. However, it can have the drawbacks to deteriorate audio quality as a secondary problem. In this mis-adjustment problem, the universal solution is not led in the conventional adaptive filter's optimization. In this paper, we propose a new multichannel adaptive echo canceling algorithm based on particle swarm optimization (PSO) without pre-processing to input signals. PSO is a stochastic optimization technique inspired by social behavior of bird frocking or fish schooling, and this is the first attempt to apply it for multichannel acoustic echo cancelers. By performing various simulation we confirm the proposed method can be estimate correct echo-paths with highly cross-correlated input signals.
<生体医工学・福祉工学>
<システム・計測・制御>
  • 土井 正好, 福原 翔, 森 泰親
    2015 年 135 巻 1 号 p. 58-65
    発行日: 2015年
    公開日: 2015/01/01
    ジャーナル 認証あり
    In recent years, Japanese forests are necessary thinning of the forest. However, the sustainable wood left around there because of expending tremendous effort and costs for carrying woods out. The cut woods have been left around there. This study designs a high maneuverability vehicle with a balance control of a load-carrying platform. The vehicle transport the sustainable woods on the steep sloping ground. This study detected a delay time in regard of controlling the motion of the load-carrying platform. Generalized Minimum Variance Control, one of the predictive control is applied to the controlling system.
  • 長松 正康, 川田 和男, 山本 透, 山根 八洲男
    2015 年 135 巻 1 号 p. 66-72
    発行日: 2015年
    公開日: 2015/01/01
    ジャーナル 認証あり
    To facilitate optimal skill acquisition process, modeling and estimation of individual learning processes will be of key importance. We have proposed a model of skill acquisition based on control theory which enable us to model individual learning process with three parameters; system gain K, time constant T, and dead time L. We measured individual performance time of fault finding task on software programming and successfully obtained the three parameters. These results indicate the feasibility of online estimation of individual learning parameters.
  • 濱田 雅志, 山田 和寛, 乘松 直樹, 辻本 浩章
    2015 年 135 巻 1 号 p. 73-80
    発行日: 2015年
    公開日: 2015/01/01
    ジャーナル 認証あり
    Recently, magnetic thin film devices using magneto resistance (MR) effect are useful for the hard disk drive heads and the magnetic sensors. Therefore magneto resistance effect films have been widely studied, and a rapid progress is being made in this field. We had proposed a new thin-film device. The new proposed thin film device is a magnetic thin film power sensor. The output signal of magnetic thin film power sensor is a dc voltage. In this paper, we report high frequency electric power measurement in the range of MHz frequency with magnetic thin film power sensor.
  • 石川 友規, 小嶋 昂明, 滑川 徹
    2015 年 135 巻 1 号 p. 81-89
    発行日: 2015年
    公開日: 2015/01/01
    ジャーナル 認証あり
    This paper addresses wind power prediction which is known to be a key technology in EMS(Energy Management Systems). In this paper, 24 hours ahead power prediction method using a filtering theory is proposed for wind power generation. The prediction method is a simple algorithm, the procedure of prediction consists of two steps, the data processing and the calculation of predicted values. In the data processing, in order to get the correlative data from the database, we employ JIT(Just-In-Time) Modeling. In the calculation of predicted value, we propose the regression model for wind speed and wind power, and the unknown parameters are estimated via constrained kalman filter. Moreover, in a procedure of estimation of the unknown parameters, reduction and the convergence of them are also guaranteed. Finally, the advantages of the proposed method over the conventional method are shown through actual prediction evaluations.
  • 橋本 幸二郎, 道木 加絵, 道木 慎二
    2015 年 135 巻 1 号 p. 90-101
    発行日: 2015年
    公開日: 2015/01/01
    ジャーナル 認証あり
    A modeling approach of human actions is focused, which designs human action model based on the obtained stored data during long-term monitoring of a person. This approach consists of the following two processes. At first, several kinds of frequent partial time series data are extracted from the stored data and regarded as human action patterns. Next, the extracted time series data are modeled based on a statistical modeling method such as Hidden Markov Model. In this research, it is focused on the extraction method of the frequent time series data in the stored data. A person changes his action according to the change of the situation around him. And, it takes some time for him to perform his action after he recognizes the situation around himself. This time is called delay time in this paper. A human action model considering this delay time leads to greater accuracy in recognition and prediction of human action based on the one. It is necessary to extract time series data of situation and action containing the delay time as learning data in order to generate the above human action model. In conventional methods, multi-dimensional time series data are used as the stored data without distinction between situation and action data. And, some frequent partial time series data are extracted from the stored data. Therefore, the delay time is not considered. In this paper, we propose a new extraction method of a frequent time series data considering the delay time. In this method, the frequent partial time series data with the delay time are extracted by evaluating the repeatability and relativity between the partial time series data with different occurrence time. In the experiment, extraction of a frequent interaction motion between two examinees is executed. The usefulness of the propose method is examined through some experimental results.
  • Fitri Yakub, Yasuchika Mori
    2015 年 135 巻 1 号 p. 102-110
    発行日: 2015年
    公開日: 2015/01/01
    ジャーナル 認証あり
    This study proposes the model predictive control (MPC) with proportional-integral (PI) controller for coordination of active front steering (AFS) and direct yaw moment control (DYC) maneuvers for path following control in an unmanned ground vehicle system. A single-track mode of lateral-yaw motions based on a linearized vehicle model with linear tire characteristics is used for controller design, while the vehicle model used includes roll dynamic motion for the double-track model with a nonlinear tire model. Based on a known trajectory, we tested the vehicle at high forward speed due the fact that the roll dynamic motion will be influenced at high vehicle speed for a double lane change scenario in order to follow the desired trajectory as close as possible, while rejecting the effects of a wind gust. We compared two different controllers; i) MPC with PI of an AFS and, ii) MPC with PI for coordination of AFS and DYC. The simulation results show the proposed coordinated control yielded better tracking performance through high speed maneuvers than AFS maneuvers only. It also demonstrates that the proposed control methods are useful to maintain and enhance vehicle stability along the desired path, and has the ability to eliminate the effect of crosswind.
<音声画像処理・認識>
<ソフトコンピューティング・学習>
<情報処理・ソフトウェア>
  • 神戸 英利, 北上 眞二, 澤本 潤, 三井 浩康, 小泉 寿男
    2015 年 135 巻 1 号 p. 123-133
    発行日: 2015年
    公開日: 2015/01/01
    ジャーナル 認証あり
    The number of lines of code in the embedded software has been growing. In the reuse-based embedded software development, it is increasing of cases that accumulate software from two or more products. It has become inevitable to reuse the existing software. However, if the existing software to be reused is not well managed or organized, nobody will be able to know which modules would be affected when some parts of the reused software are modified. In this paper, we propose a method to accomplish the effective reuse of software modules by managing dependency information among modules and having development management property data to each module.  We have developed a configuration management tool that visualizes mutual relations among existing software modules and visually presents not only dependency among modules but also development management property data of modules according to the developer's demand for reuse of modules. We evaluated the method by applying it to some actual developments.
研究開発レター
<生体医工学・福祉工学>
<システム・計測・制御>
<音声画像処理・認識>
 
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