Hokkaido University

Hokkaido University Collection of Scholarly and Academic Papers
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    Consideration regarding methods to finance social support for children and childcare : A legal evaluation of children and childcare support contribution system in comparison with long-term care insurance system

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    This article conducts a legal evaluation of children and childcare support contribution system in comparison with long-term care insurance system, as part of considering methods to finance social support for children and childcare, based on the premise that it is necessary to socialize children and childcare support in the same way as long-term care

    Grey wolf optimization tuned drivetrain vibration controller with backlash compensation strategy using time-dependent-switched Kalman filter

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    To improve the performance and durability of vehicle components, efforts have been made to reduce driveline oscillations using advanced active control algorithms. However, existing methods often rely on subjective parameter adjustments, which can be burdensome for designers. This study introduces an effective tuning algorithm for a driveline vibration controller that accounts for nonlinear backlash effects. Initially, a driveline dynamics model is developed to focus on transient oscillations resulting from changes in driving force and the presence of nonlinear backlash. The backlash impact is incorporated into the model through a discontinuous dead-zone region. Two operational dynamics, which are the contact mode and the backlash mode, are considered. A dynamic output feedback H 2 controller is designed as a baseline controller to mitigate low-frequency resonance in the driveline. A solution for managing the nonlinear backlash challenges is introduced, involving the use of a simple control mode switching algorithm in conjunction with the controller. This algorithm relies on a time-dependent-switched Kalman filter. Additionally, the optimal settings for the parameters needed by the mode-switching algorithm are autonomously determined using the grey wolf optimizer (GWO). The proposed active controller can be implemented in real vehicles by using an on-vehicle acceleration sensor and electronic control unit (ECU). In a simulation environment, the vehicle body vibration is online fed back to the resultant controller, and an actuator is supposed to apply control commands to the driveline. The effectiveness of this newly proposed active controller is confirmed through comparative tests, revealing the superior vibration control

    ベロガレイ科(真骨下綱:カレイ目)とその近縁群の比較形態学および系統類縁関係 [全文の要約]

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    この博士論文全文の閲覧方法については、以下のサイトをご参照ください。https://www.lib.hokudai.ac.jp/dissertations/copy-guides

    マウス精巣特異的長鎖非コードRNAのTesraによる転写活性化メカニズムと精子形成過程での生理機能に関する研究 [全文の要約]

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    この博士論文全文の閲覧方法については、以下のサイトをご参照ください。【担当:理学部図書室】https://www.lib.hokudai.ac.jp/dissertations/copy-guides

    コケ植物Physcomitrium patensにおける極性細胞の伸長と発生に関与する新規因子の同定 [全文の要約]

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    この博士論文全文の閲覧方法については、以下のサイトをご参照ください。【担当:理学部図書室】https://www.lib.hokudai.ac.jp/dissertations/copy-guides

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    Hokkaido University Collection of Scholarly and Academic Papers
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