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Treatment of Resampling Frequency and Epoch Length for RR interval in Autonomic Nervous System Analysis 4

Treatment of Resampling Frequency and Epoch Length for RR in...

引用

4th IEEE Global Conference on Life sciences and Technologies, LifeTech 2022

作者： Yamada, Miyu Ayabe, Makoto Okayama Prefectural University Graduate School of Computer Science and Systems Engineering Okayama Japan Okayama Prefectural University Human Information Engineering Okayama Japan

ISBN: (纸本)9781665419048

This investigation aimed to clarify the effects of the frequency of resampling of the RR interval and length of the analysis interval to simplify the analysis of heart rate variability (HRV) for the evaluation of the autonomic nerve system (ANS). The subjects were 15 male university students, and the experiment consisted of 10 min of rest and 10 min of a pleasant-emotion-induction task, for a total of 20 min. The heart rate and pulse rate were detected from the measured electrocardiogram and pulse waves. RR intervals were used to analyze sympathetic and parasympathetic nerve activity. The resampling frequency was set to 2, 4, and 10 Hz. The analysis times were 30, 60, 120, 300, and 600 s for the 10-min resting period and 30, 60, and 300 s for the changes associated with the induction of pleasant emotions. The total power (TP), high-frequency (HF) power, and low-frequency (LF) power exhibited an interaction between the resampling frequency and analysis time. In the pleasant-emotion-induction task, significant differences were observed among HF/TP, LF/TP, and LF/HF at 2, 4, and 10 Hz. However, when the analysis time was set to 30 s, the number of measurement points where statistically significant differences were obtained was limited. The present investigation demonstrates that the sensitivity of the relative ANS index may decrease with decreasing analysis time. The results of this investigation suggest that while a shorter measurement time is consistent with adequate rest, the sensitivity of the ANS index to capture minute changes in the body needs to be considered. © 2022 IEEE.

关键词： Electrocardiograms

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Swing-Down Control of a Rings Gymnastic Robot

Swing-Down Control of a Rings Gymnastic Robot

引用

2022 Chinese Automation Congress, CAC 2022

作者： Jin, Zhijie Xin, Xin Peng, Zhiyu Liu, Yannian Southeast University School of Automation Nanjing China Okayama Prefectural University Faculty of Computer Science and Systems Engineering Okayama Japan

ISBN: (纸本)9781665465335

In this paper, we study the swing-down control of a rings gymnastic robot, which is a 3-link planar robot moving in a vertical plane with only the last joint being actuated. The control objective is to swing the rings gymnastic robot from the DUU (Down-Up-Up) equilibrium point to the DDD (Down-Down- Down) equilibrium point and stabilize it around the latter. We present an SD (sinusoidal-derivative) controller, which is linear feedback of sinusoidal function of the angle of the actuated joint and linear feedback of its angular velocity. We analyze globally the motion of the rings gymnastic robot under the proposed controller, and provide a sufficient condition for achieving the control goal. We study how to find control gains to achieve an exerllent control performance, and verify the effectiveness of the proposed control via simulation. © 2022 IEEE.

关键词： Motion analysis

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Balance Control for a Class of Underactuated systems via Compensation Signals

Balance Control for a Class of Underactuated Systems via Com...

引用

2022 Chinese Automation Congress, CAC 2022

作者： Li, Yue Xin, Xin Yan, Yuhang Southeast University School of Automation Nanjing China Okayama Prefectural University Faculty of Computer Science and Systems Engineering Okayama Japan

ISBN: (纸本)9781665465335

As a typical underactuated experimental platform for robotics and control theory, the rotary inverted pendulum (RIP) system is nonlinear, multi-variable, and strongly coupled. We study the swing-up and balance control for the RIP system with system uncertainty. The classical energy-based swing-up control without compensation for the uncertainty and the signal compensation-based balance control are adopted. In the balance control, from the linearized state-space model near the upright equilibrium point (UEP) and the estimated discrete-time model, a signal compensation-based balance control is constructed to eliminate and suppress the system uncertainty. Simulation results verify the effectiveness of the controllers. © 2022 IEEE.

关键词： State space methods

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Trajectory Planning and Tracking Control for the Pendubot

Trajectory Planning and Tracking Control for the Pendubot

引用

2022 Chinese Automation Congress, CAC 2022

作者： Xu, Bin Xin, Xin Yan, Yuhang Liu, Yannian School of Automation Southeast University Nanjing China Okayama Prefectural University Faculty of Computer Science and Systems Engineering Okayama Japan

ISBN: (纸本)9781665465335

In this paper, we study the trajectory planning and tracking control for the Pendubot, which is a two-link robot has a single actuator at the base joint of the first link. We realize a fast swing-down control under the sinusoidal-derivative (SD) controller which introduces a damper and spring, and obtain a desired trajectory of the state and the control input by using the swing-down controller and the time-reversal method. To track such a trajectory, we derive the linearized time-varying model of the Pendubot around the trajectory, and design a linear state feedback control along with a feedforward term determined by the trajectory of the control input. We study several obtained trajectories and focus on two issues: 1) the linear controllability of the corresponding linearized time-varying model for each trajectory;2) the sufficient condition in the literature for checking the stability of the tracking control of the linearized time-varying model. Through our numerical investigation, we find that we have to choose appropriate control gains of the SD controller to guarantee the linear controllability, and that the sufficient condition is difficult to be satisfied. © 2022 IEEE.

关键词： Controllability

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Energy-based Swing-up Control with Parameter Optimization for a Rings Gymnastic Robot

Energy-based Swing-up Control with Parameter Optimization fo...

引用

2022 Chinese Automation Congress, CAC 2022

作者： Hu, Jiangyong Xin, Xin Yan, Yuhang Peng, Zhiyu Liu, Yannian Southeast University School of Automation Nanjing China Okayama Prefectural University Faculty of Computer Science and Systems Engineering Okayama Japan

ISBN: (纸本)9781665465335

In this paper, we study a ring gymnastic robot, which is a planar robot with three links moving in the vertical plane with only the last joint activated. First, we use the energy-based strategy to study the swing-up control task of the rings gymnastic robot, and obtain the sufficient and necessary condition for non-existence of singularities in the energy-based controller. Second, we derive the invariant set approached by the closed-loop system. Third, we propose an optimization algorithm to obtain the parameters of the energy-based controller to swing up the rings gymnastic robot into a close neighbourhood of a desired equilibrium point. Fourth, we check on the feasibility of the devised controller and parameter optimization algorithm through simulation. © 2022 IEEE.

关键词： Controllers

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Energy-based Control of Three-Link Planar Robot with Last Active Link

Energy-based Control of Three-Link Planar Robot with Last Ac...

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2022 Chinese Automation Congress, CAC 2022

作者： Wang, Yongjia Xin, Xin Liu, Yannian Southeast University School of Automation Nanjing China Okayama Prefectural University Faculty of Computer Science and Systems Engineering Okayama Japan

ISBN: (纸本)9781665465335

This paper studies the energy-based control for a 3-link planar robot with last active link, for which the angle between the last link and the vertical is actuated. The swing-up and stabilizing task around the robot's upright equilibrium point (UEP) is investigated. An energy-based controller is derived to control both its overall energy and actuated variable. By presenting a property of the robot that holds under arbitrary physical parameters, this paper proves that almost all initial states converge to an invariant set where the last link is upright and the robot's overall energy equals its value at the UEP, providing certain requirements on control gains are satisfied. This paper provides simulation verification for the obtained theoretical results, in which a local stabilizing controller is utilized to accomplish stabilization at the UEP. © 2022 IEEE.

关键词： Motion analysis

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Improving Transparency of Hardware Breakpoints with Virtual Machine Introspection 12

Improving Transparency of Hardware Breakpoints with Virtual ...

引用

12th International Congress on Advanced Applied Informatics, IIAI-AAI 2022

作者： Sato, Masaya Nakamura, Ryosuke Yamauchi, Toshihiro Taniguchi, Hideo Okayama Prefectural University Faculty of Computer Science and Systems Engineering Soja Japan Okayama University Graduate School of Natural Science and Technology Okayama Japan Okayama University Faculty of Natural Science and Technology Okayama Japan

ISBN: (数字)9781665497558

ISBN: (纸本)9781665497558

Hardware breakpoints are used to monitor the behavior of a program on a virtual machine (VM). Although a virtual machine monitor (VMM) can inspect programs on a VM at hardware breakpoints, the programs themselves can detect hardware breakpoints by reading debug registers. Malicious programs may change their behavior to avoid introspection and other security mechanisms if a hardware breakpoint is detected. To prevent introspection evasion, methods for hiding hardware breakpoints by returning a fake value to the VM are proposed. These methods detect the read and write operations of the debug register from the VM and then return the processing to the VM as if their access has succeeded. However, VM introspection remains detectable from the VM by confirming the availability of the debug exception in the address set. While the previous work handles the read and write operations of the debug register, the debug exception is not delivered to the VM program. To address this problem, this study presents a method for making hardware breakpoints compatible with VM introspection. The proposed method uses surplus debug address registers to deliver the debug exception at the hardware breakpoint set by the VM program. If a VM program attempts to write a value to a debug register, the VMM detects and stores the value in a real debug register that is not used for VM introspection. Because debug exception at the hardware breakpoint was delivered to the VM, hardware breakpoints set by the VM were compatible with VM introspection. The evaluation results showed that the proposed method had a low performance overhead. © 2022 IEEE.

关键词： Virtual machine

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A Deployment of Ensemble-Based IDS on Raspberry Pi 13

A Deployment of Ensemble-Based IDS on Raspberry Pi

引用

13th IEEE Global Conference on Consumer Electronic, GCCE 2024

作者： Musthafa, Muhammad Bisri Huda, Samsul Shamim, S.M. Kodera, Yuta Mwaura, Jedidah Araki, Shunsuke Nogami, Yasuyuki Okayama University Graduate School of Environmental Life Natural Science and Technology Japan Okayama University Green Innovation Center Japan Kyushu Institute of Technology Graduate School of Computer Science and Systems Engineering Fukuoka Japan Kyushu Institute of Technology Faculty of Computer Science and Systems Engineering Fukuoka Japan

ISBN: (纸本)9798350355079

Intrusion Detection systems (IDS) are essential for safeguarding IoT networks against various attacks. Our previously developed ensemble-based IDS model, which combines stacked Long Short-Term Memory (LSTM) networks with ANOVA feature selection, achieved a remarkable accuracy of 97.46% and an overfitting value of 0.22% in classifying network attacks. However, deploying this powerful model on resource-constrained devices like Raspberry Pi poses challenges due to limited computational resources. In this paper, we tackle these challenges by converting the original model to TensorFlow Lite (TFLite) and applying quantization techniques to optimize the model size for deployment on a Raspberry Pi 3b+. Our approach significantly reduces the model size by 90.9% while maintaining an impressive accuracy of 96.96%, only a 0.5% reduction from the original model. The optimized model demonstrates efficient performance on the Raspberry Pi, with a loading time of 100.2ms and an inference time of 1.2ms. © 2024 IEEE.

关键词： Network intrusion

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A requirement analysis method for the design of the upgradable product-service system 33

A requirement analysis method for the design of the upgradab...

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33rd CIRP Design Conference

作者： Wang, Hanfei Mitake, Yuya Tsutsui, Yusuke Alfarisi, Salman Shimomura, Yoshiki Faculty of Systems Design Tokyo Metropolitan University Asahigaoka 6-6 Hino-shi Tokyo191-0065 Japan Human Augmentation Research Center National Institute of Advanced Industrial Science and Technology Chiba277-0882 Japan Faculty of Computer Science and Systems Engineering Okayama Prefectural University Okayama719-1197 Japan

For extending the life cycle of products and satisfying the further requirement of customers, product-service system (PSS), an integration of products and services is considered as a promising solution. However, for PSS design, customers' expectations on the purchased product could be changed due to the development of technology and fashion. For this reason, the life of value might be exhausted before the real life of a product. Although there are some existing upgrade plans or maintenance plans for PSS design, it is found to be risky for PSS firms to provide the mentioned plans that are threatened by various uncertain events. Thus, to achieve an upgradable PSS, it is extremely essential to propose a method to identify the requirement for upgradability based on the perspective of customers. To achieve this aim, this paper has developed a method includes four steps. In step one, a set of definitions is provided to clarify the upgradability of PSS. In step 2, this study utilizes a PEST-OT matrix to analyze the driver of the future development. Step3 uses a persona-based explorative scenario building method to identify the characteristic of targeted customer and build a scenario of interaction between customer and PSS in a future scenario. Step 4 provides a requirement transformation method to transform the requirement into receiver state parameter (RSP). After that, the RSP is transformed into detailed product characteristics (PChs) and service characteristics (SChs). To verify the effectiveness, a case study of shared furniture is used. The result of the case study shows this method could work effectively in a Business-to-Customer business. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0)

关键词： Life cycle

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A conceptional structure for challenging the rebound effect of the product-service system 33

A conceptional structure for challenging the rebound effect ...

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33rd CIRP Design Conference

作者： Alfarisi, Salman Mitake, Yuya Tsutsui, Yusuke Wang, Hanfei Shimomura, Yoshiki Faculty of Systems Design Tokyo Metropolitan University Tokyo191-0065 Japan Human Augmentation Research Center National Institute of Advanced Industrial Science and Technology Chiba277-0882 Japan Faculty of Computer Science and Systems Engineering Okayama Prefectural University 719-1197 Japan

The product obsolescence rate is one of the product-service system rebound effect issues. Obsolescence can be generated by both planned obsolescence and post-production obsolescence. Planned obsolescence can increase sales and revenue artificially. However, the pattern of planned obsolescence has demonstrated that obsolescence is no longer limited to functional obsolescence but rather rapidly evolves to include quality and aesthetic aspects. Moreover, post-production consuming behaviours hasten the rate of product obsolescence, especially in the absence of ownership. At this point, rapid obsolescence contradicts the spirit of the Product-service System's (PSS) value proposition. During the stage of value co-creation, such topics must be considered. According to research on PSS and the co-creation process, the co-creation of value is inherent to PSS. Nevertheless, managing the process of value co-creation is another challenge. In addition, decision-making should also be prevented from being dominated by a high degree of centralisation. This paper presents a preliminary investigation into constructing a framework for managing the value co-creation process and decision-making to prevent the rebound effect based on conceptual review. This study identifies methods applicable to the co-creation procedure. A conceptional structure of co-creation of value and decision-making is presented. © 2023 The Authors. Published by Elsevier B.V.

关键词： Obsolescence

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