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
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131 巻, 6 号
選択された号の論文の34件中1～34を表示しています
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特集：圧電材料・デバイス
巻頭言
特集招待論文
<電子物性・デバイス>
  • 高周波レーザドップラ振動計による圧電ディスク型共振子の振動モードの観察
    松村 武, 江刺 正喜, 原田 博司, 田中 秀治
    2011 年 131 巻 6 号 p. 1086-1093
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1086
    ジャーナル フリー
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    For future mobile phones based on cognitive radio technology, a compact multi-band RF front-end architecture is strongly required and an integrated multi-band RF filter bank is a key component in it. Contour-mode resonators are receiving increased attention for a multi-band filter solution, because its resonant frequency is mainly determined by its size and shape, which are defined by lithography. However, spurious responses including flexural vibration are also excited due to its thin structure. To improve resonator performance and suppress spurious modes, visual observation with a laser probe system is very effective. In this paper, we have prototyped a mechanically-coupled disk-array filter, which consists of a Si disk and 2 disk-type resonators of higher-order wine-glass mode, and observed its vibration modes using a high-frequency laser-Doppler vibrometer (UHF-120, Polytec, Inc.). As a result, it was confirmed that higher order wine-glass mode vibration included a compound displacement, and that its out-of-plane vibration amplitude was much smaller than other flexural spurious modes. The observed vibration modes were compared with FEM (Finite Element Method) simulation results. In addition, it was also confirmed that the fabrication error, e.g. miss-alignment, induced asymmetric vibration.
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  • 横波型弾性表面波を用いた液相系センサ
    近藤 淳
    2011 年 131 巻 6 号 p. 1094-1100
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1094
    ジャーナル フリー
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    A surface acoustic wave (SAW) is perturbed from physical and/or chemical changes of an adjacent medium. If a liquid-phase sensor is realized, a shear horizontal SAW (SH-SAW) must be used. The SH-SAW sensors been investigated since 1987. Measuring objects of the SH-SAW sensor are not only immunoreactions but also liquid properties. Feature of the SH-SAW sensor is simultaneous detection of mechanical and electrical properties of liquid. In this paper, first, theory of the SH-SAW sensor is described. Then experimental results using the SH-SAW sensor on 36YX-LiTaO3 are introduced. Also, the sensor sensitivities of the SH-SAW sensors which are fabricated on piezoelectric substrates are theoretically compared.
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特集論文
<電子物性・デバイス>
<電気回路・電子回路>
  • 広帯域ラダー型SAWフィルタの動的温度補償の検討
    中村 暢之, 小松 禎也, 大森 達也, 橋本 研也, 山口 正恆
    2011 年 131 巻 6 号 p. 1181-1185
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1181
    ジャーナル フリー
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    Because of there excellent features such as small-size, wide bandwidth, and low insertion loss, the ladder-type filters based on surface acoustic wave (SAW) technology have been widely used as radio-frequency (RF) filters in mobile communications. We can make wide bandwidth, and low insertion loss, the ladder-type SAW filters on a Cu-grating/15°LiNbO3 substrate structure. On the other hand, it is said that wide bandwidth filters is bad temperature characteristic. So this paper discusses dynamic temperature compensation of wideband ladder-type SAW filters. First, we investigate how wide tunability is achievable using variable capacitors parallel- and/or series-connectted to SAW resonators in the filter configuration. Second, we measured the temperature characteristic of resonator. Finally, we simulated temperature compensation of wideband ladder-type SAW filters. As a result, we were able to compensate the change of the characteristic with the ladder-type SAW filter connected variable capacitors.
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特集研究開発レター
<電子物性・デバイス>
<電気回路・電子回路>
  • CVD作製したLiTaO3薄膜の特性
    門田 道雄, 栃下 光
    2011 年 131 巻 6 号 p. 1188-1189
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1188
    ジャーナル フリー
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    LiTaO3 is a key material for surface acoustic wave (SAW) devices, bulk devises, piezoelectric elements, pyroelectric sensors and other applications. However, for almost of their applications the LiTaO3 single crystal is used. In this paper, authors report the growth of LiTaO3 films on a metal electrode layer by Chemical Vapor Deposition (CVD) by changing Li source condition. The characteristics of the LiTaO3 films observed by the X-ray diffraction (XRD) and their polarity dependent on the Li source supply volume. By controlling the Li/Ta ratio, high quality ferroelectric LiTaO3 films are deposited.
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論文
<システム・計測・制御>
  • 交通渋滞緩和のための遺伝的アルゴリズムに基づく道路交通管制
    重弘 裕二, 宮川 拓也, 増田 達也
    2011 年 131 巻 6 号 p. 1190-1198
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1190
    ジャーナル フリー
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    In this paper, we propose a road traffic control method for reducing traffic congestion with genetic algorithm. In the not too distant future, the system which controls the routes of all vehicles in a certain area must be realized. The system should optimize the routes of all vehicles, however the solution space of this problem is enormous. Therefore we apply the genetic algorithm to this problem, by encoding the route of all vehicles to a fixed length chromosome. To improve the search performance, a new genetic operator called “path shortening” is also designed. The effectiveness of the proposed method is shown by the experiment.
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  • 実乗務制約を有する鉄道乗務員運用計画問題に対する列生成法の適用
    西 竜志, 室井 裕喜, 乾口 雅弘, 高橋 理, 片岡 健司
    2011 年 131 巻 6 号 p. 1199-1208
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1199
    ジャーナル フリー
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    In this paper, we propose a column generation method for the railway crew scheduling problem with a variety of practical constraints such as lower and upper constraints of one continuous traveling, total working time, admissible number of crews, and meal time constraints. The proposed method consists of the two steps. The first step is to derive a lower bound by the column generation and the second step is to generate a feasible solution by a heuristic method. In the proposed method, a label setting algorithm is developed to solve the pricing problem efficiently to reduce computational time. A new dominance condition is developed to eliminate unnecessary states in the label setting algorithm. A heuristic algorithm is also proposed to reduce the generation of the infeasible solutions violating the constraint on the number of the allocated crews. The effectiveness of the proposed method is evaluated by using a real railway data.
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  • FRIT for Systems with Dead-Zone and Its Application to Ultrasonic Motors
    Yuji Wakasa, Shinji Kanagawa, Kanya Tanaka, Yuki Nishimura
    2011 年 131 巻 6 号 p. 1209-1216
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1209
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    Ultrasonic motors (USMs) intrinsically have a dead-zone property which is sensitive to load changes. This paper proposes a fictitious reference iterative tuning (FRIT) method for systems with a dead-zone property such as USMs. The standard FRIT method is basically developed for linear systems and may not give a satisfactory control performance for noninvertible nonlinear systems including USMs. In contrast, the proposed FRIT method can achieve such a performance by introducing a right inverse of a dead-zone function as a dead-zone compensator. In the optimization process of FRIT, the so-called covariance matrix adaptation evolution strategy (CMA-ES) is used for simultaneously searching a dead-zone parameter as well as controller parameters. CMA-ES is a kind of stochastic multi-point search techniques and is effective for nondifferentiable and nonconvex optimization problems. Experimental results for a USM are given to show the effectiveness of the proposed method.
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  • ノイズに対しロバストなpre-inverse適応システムとモーター制御への応用
    小林 正樹, 衣笠 保智, 笹岡 直人, 伊藤 良生
    2011 年 131 巻 6 号 p. 1217-1222
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1217
    ジャーナル フリー
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    In general, the adaptive system using the structure in which an adaptive filter is placed before the unknown system to estimate the inverse transfer function of the unknown system is called pre-inverse adaptive system. The equalizing type adaptive system that the weights of the adaptive transversal filter inserted after the unknown system are copied to the transversal filter inserted before the system is the representative example. The problem of this system is that the convergence value has the bias error since the adaptive parameters are updated to the direction where the estimation error including the noise was minimized. In this paper we consider a noise free equalizing type adaptive algorithm and its application to the adaptive control of the motor. The convergence of the control system is guaranteed under the assumption of the uncorrelated property of the noise, disturbance and the command input. Finally, these results of theoretical consideration are verified by computer simulation.
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<知能，ロボティクス>
<音声画像処理・認識>
  • 衛星画像における非線形モデルと近傍画素フィルタを適用した混合画素推定法
    伊藤 征嗣, 小黒 剛成
    2011 年 131 巻 6 号 p. 1233-1240
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1233
    ジャーナル フリー
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    The several papers reported that the errors in land cover classification have been generated around the edge of categories especially. The mixed pixel that includes the multiple categories is one of the error factors. All remotely sensed images include the mixed pixel, particularly the influence of the mixed pixels in the middle- or low-resolution images is more serious.
    In this paper the method using the nonlinear mixed pixel model and the filtering of the neighborhood pixels have been proposed. In order to verify the effectiveness of the proposed method, the six simulations have been made; two patterns without the proposed filter are for the linear and for the nonlinear models, and four patterns with the proposed filter are for the proposed nonlinear method.
    The results of the simulations have been quantitatively evaluated by calculating the correlation coefficients between the simulated results obtained from Landsat-7/ETM+ image and the model answers made by QuickBird-2 images. It was confirmed that the correlation coefficients of the proposed nonlinear model and the proposed filter were improved than that of the other results.
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<情報システム，エレクトロニック・コマース>
  • Multi Objective Dynamic Job Shop Scheduling using Composite Dispatching Rule and Reinforcement Learning
    Xili Chen, XinChang Hao, Hao Wen Lin, Tomohiro Murata
    2011 年 131 巻 6 号 p. 1241-1249
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1241
    ジャーナル フリー
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    The applications of composite dispatching rules for multi objective dynamic scheduling have been widely studied in literature. In general, a composite dispatching rule is a combination of several elementary dispatching rules, which is designed to optimize multiple objectives of interest under a certain scheduling environment. The relative importance of elementary dispatching rules is modeled by weight factors. A critical issue for implementation of composite dispatching rule is that the inappropriate weight values may result in poor performance. This paper presents an offline scheduling knowledge acquisition method based on reinforcement learning using simulation technique. The scheduling knowledge is applied to adjust the appropriate weight values of elementary dispatching rules in composite manner with respect to work in process fluctuation of machines during online scheduling. Implementation of the proposed method in a two objectives dynamic job shop scheduling problem is demonstrated and the results are satisfactory.
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<情報処理・ソフトウェア>
  • 多種情報を利用した学術論文フィルタリング方式
    山本 雅夫, 絹川 博之
    2011 年 131 巻 6 号 p. 1250-1259
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1250
    ジャーナル フリー
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    A paper filtering system that supports the effective collection of related journal papers is becoming important as the technological progress has been rapid. However, previous systems realized insufficient filtering effectiveness, because of lack of available information in abstract part of journal papers that is available to the public. In this paper, we propose a paper filtering method using the multiple information such as structure, co-author, subject category, terminology, and terms in patent document.
    By the evaluation for 15 examinees using 4,875 journal papers, it became clear that for all examinees the effectiveness of proposed method exceeds the conventional method, when the all information above are used, which became closer to practical use.
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  • 予測の容易さに着目して競合の発生を抑制するストライド値予測機構
    下村 佳生, 小林 良太郎
    2011 年 131 巻 6 号 p. 1260-1270
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1260
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    There is a stride value predictor as a technology that eases the data dependency that is the factor to restrict the program parallelism. This mechanism predicts the values that the instruction generates by using Value History Table (VHT). There is a problem of confliction of VHT as a factor to limit the predictive performance. In order to reduce confliction of VHT, we focus on predictability to propose two schemes. One is to update the only predictable instructions to VHT, the other is to suppress the replace frequency of VHT. The evaluation results show that improving the predictive performance without increasing the number of entries of VHT or decreasing the number of VHT entries by small predictive performance loss becomes possible by the addition of small-scale dedicated table.
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研究開発レター
<生体医工学・福祉工学>
<音声画像処理・認識>
  • ジャギーが生じない修正双線形補間法
    井上 恵太, 村平 宏太, 田口 亮
    2011 年 131 巻 6 号 p. 1273-1274
    発行日: 2011/06/01
    公開日: 2011/06/01
    DOIhttps://doi.org/10.1541/ieejeiss.131.1273
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    We propose a novel interpolation method which is a modified the Bi-linear interpolation. The Bi-linear interpolation is computationally efficient, but it often generates jaggy-noise around the edges. We deal with the double expansion in this paper. In the case of the double expansion, the accuracy of the interpolation is improved and jaggy noise is disappeared by improving the interpolation method for the interior point. Here, we propose a novel edge-adaptive interpolation method for the interior point. By the experimental results, the effectiveness of the proposed method is verified from the subjective and objective points of view.
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