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Investigation of erythrocyte aggregation parameters of blood with low levels of fibrinogen by syllectometry

Journal of Biorheology 2023年第1期37卷 2-8页

作者： Higuchi, Makoto Tanaka, Masayoshi Watanabe, Nobuo Functional Control Systems Course Graduate School of Engineering and Science Shibaura Institute of Technology Saitama Japan Ogino Memorial Laboratory Nihon Kohden Corporation Tokyo Japan Systems Engineering and Science Graduate School of Engineering and Science Shibaura Institute of Technology Saitama Japan

An increase in fibrinogen, a coagulation factor in blood, enhances erythrocyte aggregation. However, no pre-vious studies have fully investigated erythrocyte aggregation at low plasma fibrinogen concentrations (1/2) increased with decreasing fibrinogen concentration (r = –0.827), similar to previously reported results for normal to high fibrinogen concentrations. Relax-ation time (t0) increased exponentially with decreasing fibrinogen concentration (r = –0.608). These results suggest that erythrocyte aggregability decreases with decreasing fibrinogen concentration even at low fibrinogen levels that can cause coagulopathy, and that syllectometry can be used to detect decreases in fibrinogen. © Japanese Society of Biorheology 2023.

关键词： Rheology

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Cooperative Look-Ahead Lane Change System for Improving Driving Intelligence of Automated Vehicles in Critical Scenarios

IEEE Transactions on Intelligent Vehicles

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IEEE Transactions on Intelligent Vehicles 2024年第9期9卷 5876-5888页

作者： Kamal, Md Abdus Samad Bakibillah, A. Hayakawa, Tomohisa Yamada, Kou Imura, Jun-Ichi Gunma University Division of Mechanical Science and Technology Graduate School of Science and Technology Kiryu376-8515 Japan Tokyo Institute of Technology Department of Systems and Control Engineering School of Engineering Tokyo152-8552 Japan

Traffic accidents often result in quick bottlenecks and increase injudicious lane changes near incidents (or lane blockage), worsening collision risks, congestion, and fuel consumption. As a practical solution, this paper proposes a novel cooperative look-ahead lane change (Co-LLC) system for automated vehicles (AVs) to mitigate sudden accident-induced traffic effects by improving driving intelligence and safety in critical scenarios. The proposed Co-LLC system comprises the state prediction model, safety and impact evaluation unit, and decision system. Firstly, we analyze the immediate impacts of traffic accidents and identify that a lack of anticipation causes a lane change hot spot near the incident. Consequently, most attempts to change lanes early are unsuccessful due to uncooperative behavior from vehicles in the destination lane. Secondly, we design anticipatory and cooperative lane change systems for AVs to decide the need and feasibility of a lane change in advance. Thus, the proposed system enables AVs to change lanes smoothly and cooperate with other vehicles during lane changes. Finally, we investigate the impact of different penetration rates of AVs using the proposed system on overall traffic performance. The performance of our proposed system is compared to the traditional driving system, and the results show that our proposed system improves the lane-changing behavior of AVs, assists traditional vehicles in changing their lanes smoothly, and mitigates sudden accident-induced traffic impacts. Moreover, the proposed system improves the overall traffic performance with increased penetration rates. Our proposed system is computationally efficient and suitable for real-time driving in critical traffic scenarios. © 2016 IEEE.

关键词： Traffic congestion

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Adaptive FRIT-Based Recursive Robust controller Design Using Forgetting Factors 32

Adaptive FRIT-Based Recursive Robust Controller Design Using...

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32nd Mediterranean Conference on control and Automation, MED 2024

作者： Tsuruhara, Satoshi Ito, Kazuhisa Graduate School of Engineering and Science Functional Control Systems Shibaura Institute of Technology Minuma Saitama3378570 Japan Japan Society for the Promotion of Science Tokyo1020083 Japan Shibaura Institute of Technology Department of Machinery and Control Systems Minuma Saitama3378570 Japan

ISBN: (纸本)9798350395440

Adaptive FRIT (A-FRIT) with exponential for-getting (EF) has been proposed for time-varying systems to improve the data dependence of FRIT, which is a direct data-driven tuning method. However, the EF -based method is not a reliable controller because it can cause significant degradation of the control performance and instability unless the persistent excitation (PE) condition is satisfied. To solve this problem, we propose a new A-FRIT method based on directional forgetting (DF) and exponential resetting that can forget old data without instability regardless of the PE condition. To confirm the effectiveness of the proposed method, we applied it to artificial muscle control with strong asymmetric hysteresis characteristics and evaluated its robust performance against load changes during the experiment. The experimental results show that the proposed method based on DF achieves high control performance and is robust against changes in the characteristics and/or target trajectory. The proposed method is also practical because it does not require system identification, model structure, or prior experimentation. © 2024 IEEE.

关键词： Time varying systems

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Enhancing Data Labeling Through Integration of SS-DBSCAN Clustering and Human-in-the-Loop 24

Enhancing Data Labeling Through Integration of SS-DBSCAN Clu...

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6th Asia Conference on Machine Learning and Computing, ACMLC 2024

作者： Monko, Gloriana J. Kimura, Masaomi Department of Functional Control Systems Shibaura Institute of Technology Tokyo Japan School of Engineering Shibaura Institute of Technology Koto City Tokyo Japan

ISBN: (纸本)9798400710018

This study introduces a novel method for integrating Stratified Sampling for Density-Based Spatial Clustering of Applications with Noise (SS-DBSCAN) clustering with the human-in-the-loop approach to semi-supervised data labeling. We enhance the feature representation of text data using attention mechanisms, leading to the formation of more contextually relevant clusters. The clusters are then processed using SS-DBSCAN, where a custom similarity function aligns them closely with expert-labeled examples, facilitating efficient label propagation. Subsequently, human experts reevaluate the clustering outputs, refining the process by reassessing the feature similarities to the expert-labeled classes. This iterative process ensures high fidelity in label assignment and enhances the overall reliability of the semi-supervised learning approach. Applied to MIMIC III and Cancer Doc Classification datasets, this method not only aligns the data labels more closely with expert evaluations but also leverages human judgment to confirm the accuracy and reliability of the re-clustering process. Based on the BERT transformers model, the fine-tuned prediction model achieved 100% accuracy in predicting the correct label and evaluated the re-clustering technique's effectiveness, demonstrating 90.3% and 97.8% correctness in the re-clustered labels in MIMIC III and Cancer Doc Classification datasets, respectively. © 2024 Copyright held by the owner/author(s).

关键词： Self-supervised learning

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SS-DBSCAN: Epsilon Estimation with Stratified Sampling for Density-Based Spatial Clustering of Applications with Noise

SS-DBSCAN: Epsilon Estimation with Stratified Sampling for D...

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2023 International Conference on Automation, control and Electronics engineering, CACEE 2023

作者： Monko, Gloriana Joseph Kimura, Masaomi Shibaura Institute of Technology Graduate School Department of Functional Control Systems Tokyo Japan Shibaura Institute of Technology Department of Computer Science and Engineering Tokyo Japan

ISBN: (纸本)9798350309201

Clustering algorithms are crucial in uncovering hidden patterns and structures within datasets. Among the density-based clustering algorithms, DBSCAN (Density-Based Spatial Clustering of Applications with Noise) has gained considerable attention for its effectiveness in various applications. However, determining appropriate parameter values for this algorithm remains a challenging task. This paper presents a novel methodology for eps parameter estimation for an improved DBSCAN, namely SS-DBSCAN. The experimental results across nine datasets demonstrate the efficacy of our proposed method in accurately determining clusters with eps value from SS-DBSCAN algorithm. The clusters identified using estimated eps values by SS-DBSCAN align well with the inherent structure of the datasets, yielding better cluster results than the manually set parameters and other methods used for automatic estimations of the eps for DBSCAN. Our approach adapted well to the peculiarities of each dataset, whether dealing with different scales, dimensions, or densities;it proved the versatility and robustness across various datasets, thereby emphasizing its generalizability and potential for broader applications. © 2023 IEEE.

关键词： Parameter estimation

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Volt-Var control for Utility-scale Solar PV Plants to Replace SVCs 4

Volt-Var Control for Utility-scale Solar PV Plants to Replac...

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4th International Conference on High Voltage engineering and Power systems, ICHVEPS 2023

作者： Shimomukai, Ken Maeda, Haruka Fujita, Goro Shibaura Institute of Technology Functional Control Systems Graduate School of Engineering and Science Tokyo Japan Shibaura Institute of Technology Graduate School of Engineering and Science Department of Electrical Engineering and Computer Science Tokyo Japan Shibaura Institute of Technology Department of Electrical Engineering Tokyo Japan

ISBN: (纸本)9798350318678

One way to increase solar photovoltaic penetration in the grid is management of voltage fluctuations. This is because a photovoltaic plant cannot be interconnected to the grid if it causes voltage violations. Voltage violation is where voltage exceeds the acceptable range. Often, grid operators request photovoltaic plant owners to regulate voltage sufficiently with expensive and space-consuming static Var compensators. Unfortunately, this sometimes makes the project less feasible. This paper argues that there are better ways to regulate voltage. We ran a simulation with a 70 MWp photovoltaic plant as an addition to the grid. Without voltage regulation, voltage violations were found to be significant. This paper found that oversizing the inverter sufficiently would remove all voltage violations without deploying a static Var compensator. This is often a cheaper and space-saving solution for voltage management. This paper argues that economics and spatial efficiency of reactive power compensation devices is key to increasing photovoltaic penetration. © 2023 IEEE.

关键词： Reactive power

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Relationship Between Mechanical Deformation and Contact Force Applied by Catheter Tip on Cardiac Muscle: Experimentation and Computer Modeling 5

Relationship Between Mechanical Deformation and Contact Forc...

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5th IEEE Eurasia Conference on Biomedical engineering, Healthcare and Sustainability, ECBIOS 2023

作者： Ijima, Yukako Masnok, Kriengsak Perez, Juan J. Gonzalez-Suarez, Ana Berjano, Enrique Watanabe, Nobuo Master's Program Global Course of Engineering and Science Graduate School of Engineering and Science Shibaura Institute of Technology Saitama Japan Functional Control Systems Graduate School of Engineering and Science Shibaura Institute of Technology Biofluid Science and Engineering Laboratory Saitama Japan Universitat Politecnica de Valencia BioMIT Department of Electronic Engineering Valencia Spain School of Engineering University of Galway Translational Medical Device Lab Galway Ireland Functional Control Systems Graduate School of Engineering and Science College of Systems Engineering and Science Shibaura Institute of Technology Biofluid Science and Engineering Laboratory Department of Bio-Science and Engineering Saitama Japan

ISBN: (纸本)9798350320978

The cardiac muscle is elastic and deformable. Pushing a catheter in contact with the cardiac muscle surface to conduct focal energy-based ablative therapies, such as RF ablation, requires an adequate electrode-tissue contact surface to transfer the energy to the target site. In this regard, the relationship between the contact force (CF) and the resulting mechanical response is still unclear, in particular, the insertion depth (ID) and the diameter of the surface deformation. The objective of this study was to quantify these relationships using an ex vivo model and a computational model. A rigid bar with a 2.3 mm diameter blunt tip (mimicking a 7Fr standard ablation catheter) was placed at a perpendicular orientation on a fragment of the porcine heart. CF values ranged from 10 to 80g. We used ANSYS to build a Mooney-Rivlig model of 3 parameters based on hyperelastic material and to simulate the same conditions as in the experiments. The experimental results showed a strong linear correlation between CF and insertion depth ID ($\mathrm{R}^{2}=0.97, \mathrm{P} © 2023 IEEE.

关键词： Catheters

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In vitro comparative study of activated clotting time in fresh human whole blood with various levels of coagulability using two devices

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Journal of Biorheology 2022年第2期36卷 39-44页

作者： Watanabe, Nobuo Inoue, Masataka Honda, Masaki Masnok, Kriengsak Negishi, Teruhiko Dept. of Bio-Science and Engineering College of Systems Engineering and Science Shibaura Institute of Technology Japan Dept. of Life Sciences Systems Engineering and Science Graduate School of Engineering and Science Shibaura Institute of Technology Japan Biofluid Science and Engineering Laboratory Functional Control Systems Graduate School of Engineering and Science Shibaura Institute of Technology Japan Negishi Internal Medicine and Neurology Clinic Saitama Japan

With increasing demand for a variety of clinical diagnostics related to blood coagulability such as activated clotting time (ACT), several measurement devices have been developed. Recently, a new ACT measurement device, the Coagulometer CA-200, has become available. One issue is that there will inevitably be differences in measured ACT values among different devices. In addition, as ACT measurement becomes more widely used in clinical practice, measurement of blood coagulation will be required in patients with a wider range of blood coagulability. Consequently, the purpose of this study was to investigate blood coagulability as the function of protamine dose in heparin sodium-treated fresh human blood and to examine the correlation between measured ACT values from two devices, namely, the Coagulometer CA-200 and Hemochron Jr. Signature+. The results showed similar ACT curves as the dose of protamine was increased, becoming asymptotic at higher coagulability conditions. Under the theoretical maximal procoagulant condition, ACT values were 108 ± 22.5 and 122 ± 11 s for the CA-200 and Hemochron devices, respectively. In blood with the maximum heparin sodium content of 7 U/mL, the measured ACT was 800 and 600 s for the respective devices. Furthermore, there was a linear relationship between the ACT measurements of the two devices. This study clearly showed the feasibility of measurement with the CA-200 and its relatively higher resolution in low coagulability conditions. © Japanese Society of Biorheology 2022.

关键词： Sodium

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Predictive Vehicle control at Intersections with Look-Ahead Driving Approach

Predictive Vehicle Control at Intersections with Look-Ahead ...

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2025 SICE International Symposium on control systems, SICE ISCS 2025

作者： Magzhan, Atykhan Hossain, Md Delowar Bakibillah, A.S.M. Kamal, Md Abdus Samad Yamada, Kou Graduate School of Science and Technology Gunma University Kiryu Japan Institute of Science Tokyo Department of Systems and Control Engineering Tokyo Japan

ISBN: (纸本)9784907764852

This paper presents a look-ahead vehicle control scheme for efficient traffic management at signalized intersections. The proposed scheme predicts future driving states with a look-ahead approach as an extended adaptive cruise control (ACC) model. It maintains car-following behavior similar to human driving while predicting future states of traffic flow to minimize intersection clearing time and aggressive braking independently, similar to model predictive control (MPC) approaches. In contrast to MPC models that are computationally demanding and have limited practical applications due to real-time constraints, the proposed scheme uses a modified Intelligent Driver Model (IDM) with predictive adjustments. The efficiency of the control scheme is evaluated through simulations with multiple vehicles in intersection traffic scenarios, focusing on maintaining safe time headway within a traffic flow and ensuring efficient flows with higher intersection throughput. Comparative results indicate improvements in intersection clearance, human-like vehicle headway management, and enhanced traffic flow performance. © 2025 The Society of Instrument and control Engineers.

关键词： Adaptive cruise control

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Discussion of Teleoperation Support System Design Guideline for Working Robot in Radiation Narrow Environment 23

Discussion of Teleoperation Support System Design Guideline ...

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23rd International Conference on control, Automation and systems, ICCAS 2023

作者： Kobayashi, R. Yoshimi, T. Graduate School of Engineering and Science Shibaura Institute of Technology Functional Control Systems Course Tokyo135-8548 Japan College of Engineering Shibaura Institute of Technology Department of Electrical Engineering Tokyo135-8548 Japan

ISBN: (纸本)9788993215274

In this work, we propose a design guideline of teleoperation support system for working robots in radiation narrow environments. The proposed guideline is discussed to configure the robot system with as few sensors as possible because of decreasing the sensor failure risk by high radiation. This paper describes discussion results of the guideline candidate, focusing on relationship between the required information for robot teleoperation and number of sensors that consists of the support system. Additionally, we present some support systems that were developed for an inspection or an investigation of nuclear power plants as development cases. As a result of the guideline calculation for each development cases, we confirmed that the proposed guideline increases as the required radiation tolerance is high, and the support system is classified by the guideline. In case that the torelance is more than 200 Gy, available sensors are limited, and a sensor-saving configuration is adopted to decrease the robot failur risk by using in combination with a sensor for the robot operation. © 2023 ICROS.

关键词： Remote control

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