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
143 巻, 3 号
選択された号の論文の28件中1~28を表示しています
特集:スマートシステムと計測・制御技術 -SDGsへの貢献-
巻頭言
特集解説
特集論文
<システム・計測・制御>
特集研究開発レター
<システム・計測・制御>
論文
<電気回路・電子回路>
  • 乾 雅貴, 溝淵 智哉, 濱崎 利彦
    2023 年 143 巻 3 号 p. 318-331
    発行日: 2023/03/01
    公開日: 2023/03/01
    ジャーナル 認証あり

    The purpose of this paper is to estimate the manufacturing-related variation factor from the difference in variance and correlation of the high-precision physical model parameters for a miniature triode vacuum tube 5751 with an amplification factor of 70. The vacuum tube operating model used here is based on physical equations adapted to the large signal input behavior of vacuum tubes used in guitar amplifiers and incorporates the effect of modulation of the amplification factor. This improves the accuracy of the soft clipping and hard clipping characteristics that affect the spectrum of the distortion sound. In order to improve the accuracy of the extraction of such multivariate model parameters, we devised a new analytical formula. In addition, we devised an algorithm for sequential regression analysis of the simulated and measured values against the analytical equation, and all parameter extraction was performed automatically by a computer program. As a result, correlations between the parameters, which had not been found before, were confirmed, and it became clear that the manufacturing and assembly accuracy of the grid electrode strongly affected most of the physical parameters.

<システム・計測・制御>
  • 堀 悟, 薦田 憲久, 大川 剛直
    2023 年 143 巻 3 号 p. 332-344
    発行日: 2023/03/01
    公開日: 2023/03/01
    ジャーナル 認証あり

    A parcel delivery method combining a vehicle and a drone is proposed. In a parcel delivery business where delivery time windows exist, the delivery order is determined by considering both keeping the delivery time windows restriction and shorting the total delivery time. To solve this problem, firstly, an initial solution is obtained by looking ahead multiple route candidates and selecting the point that leads to the route with the largest number of packages that can be delivered during the specified time windows as the next destination. Then, the initial plan is successively improved. Through simulation evaluation, it is confirmed that the proposed method can increase the number of packages that can be delivered during the specified time windows and reduce delivery time compared to a method where an initial solution is greedily searched by using only next destinations' information.

  • 平岡 京, 小岩井 一茂, 山本 透
    2023 年 143 巻 3 号 p. 345-352
    発行日: 2023/03/01
    公開日: 2023/03/01
    ジャーナル 認証あり

    In designing database-driven PID control systems, the offline learning scheme of PID gains included in the database has been proposed. However, it is difficult to apply this conventional scheme to real systems with unknown time-delays. In this study, a design method of database-driven PID controller using the response prediction is newly proposed. Plural databases are prepared corresponding to different time-delays and rise times. Furthermore, data-driven response predictive method is also introduced to predict responses and time-delays for each databases. As a result, the database with the desired control performance for the controlled object is adopted. The effectiveness of the proposed scheme for unknown time-delay systems is numerically verified in simulation examples.

<ソフトコンピューティング・学習>
  • 安田 雄佑, 熊谷 渉, 田村 健一, 安田 恵一郎
    2023 年 143 巻 3 号 p. 353-363
    発行日: 2023/03/01
    公開日: 2023/03/01
    ジャーナル 認証あり

    In this paper, MOEA/D is extended to constrained optimization by making the constraints an objective function. An adaptive adjustment method is proposed to introduce a parameter for varying weights. The parameter for varying the weights is given in such a way that the bias of the search towards the feasible and infeasible regions can be adjusted. The parameter is tuned based on two guidelines to properly utilize infeasible solutions. The first is actively utilizing infeasible solutions with large constraint violations and encouraging global search including the infeasible regions. The second is actively utilizing infeasible solutions with small constraint violations and encouraging a search on the boundary of the feasible regions. This is expected to improve the global optimization performance to the feasible regions, which is a non-convex set, and the convergence performance to feasible solutions. We verify the usefulness of the proposed method for problems where the feasible regions are a convex set and a nonconvex set.

<情報処理・ソフトウェア>
  • 工藤 卓史, 中尾 雄次, 小林 俊一
    2023 年 143 巻 3 号 p. 364-371
    発行日: 2023/03/01
    公開日: 2023/03/01
    ジャーナル 認証あり

    It is proposed to incorporate 1DCAE into a virtual engineering system in mechanical system design. In order to continue using an established virtual engineering system for a long time, it is necessary to modify it in line with the evolution of CAD, CAE, analysis, and evaluation technologies. If information in CAD or the like is coded directly in the system, it will be necessary to make changes to the system. Meanwhile, if the evaluation method, etc. is changed, the user interface of the system may need to be changed. These changes require software engineers and are costly and time-consuming.

    In this paper, we propose that the elements in the system be independent, that the relationship between each element be defined by JSM, and that 3D-CAD be used for user interfaces. This will allow even those without software language skills to update the technology and create a long-lasting virtual engineering environment.

研究開発レター
<生体医工学・福祉工学>
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