检索结果-内蒙古大学图书馆

Wind Noise Reduction Strategy in Hearing Aids Through U-Net Deep Learning and Microphone Enclosure Design

IEEE Sensors Journal 2024年第11期24卷 18307-18316页

作者： Lin, Kuei-Y. Lai, Feng-M. Chang, Hung-Y. Merry Electronics Company Ltd Taichung40850 Taiwan National Chung Hsing University Department Of Mechanical Engineering Taichung402202 Taiwan Da-Yeh University Department Of Biomedical Engineering Changhua51591 Taiwan

Wind noise interference can adversely affect the performance of behind-the-ear hearing aids, particularly when used outdoors. In this study, we developed a novel strategy to mitigate this problem. Our methodology involved a modified microphone enclosure design, preprocessing stages of beamforming and wide dynamic range compression (WDRC) (which are inherent in conventional hearing aids), and advanced deep-learning-based noise reduction methods. We first explored the cavity aspect ratios and wall slanting of the microphone enclosure's design and determined that noise could be reduced by modifying the upper and lower enclosure widths from 0.8 mm (for both) to 1.1 and 0.5 mm, respectively. In terms of signal processing, a 1-D convolutional neural networks (CNNs) model achieved wind noise detection with an accuracy of 99.25% in various scenarios. The U-Net deep learning architecture was implemented for noise reduction and substantially improved short-time objective intelligibility (STOI) by 18.97%-209.09% compared with traditional high-pass filters (HPFs). Training with a voice database further improved the STOI. In terms of the mean opinion score-listening quality objective (MOS-LQO) and STOI metrics, all combinations of preprocessors with U-Net outperformed U-Net alone, and beamforming was the optimal preprocessing method. In conclusion, adaptive signal preprocessing based on wind classification, microphone enclosure optimization, and U-Net deep learning techniques effectively reduced wind noise interference, improving the outdoor usability, and listening experience provided by hearing aids. © 2001-2012 IEEE.

关键词： Beamforming

来源：评论

学校读者我要写书评

暂无评论

Deformation Direction of Cells Related to Passing Velocity through Microgap 14

Deformation Direction of Cells Related to Passing Velocity t...

引用

14th International Multi-Conference on Complexity, Informatics and Cybernetics, IMCIC 2023

作者： Hashimoto, Shigehiro Uehara, Shogo Kurihara, Ayaka Biomedical Engineering Department of Mechanical Engineering Kogakuin University Tokyo1638677 Japan Biomedical Engineering Systems Design Kogakuin University Tokyo1638677 Japan

ISBN: (纸本)9781950492718

The deformation direction of cells related to the passing velocity through a microgap has been investigated in vitro. The microgap (7 μm high, 0.4 mm wide, and 0.1 mm long) was manufactured between the ridge and the groove in the micro flow-channel by photolithography technique. Myoblasts (C2C12: mouse myoblast cells) were used in the experiment. The flow rate of the medium fluid, in which cells were suspended, was varied by the pressure head between the inlet and outlet. The deformation of each cell passing through the micro gap was observed with an inverted phase-contrast microscope. The two-dimensional projected image was tracked using "ImageJ". The experimental results shows that cells increase the velocity with deformation. Some cells tend to make elongation to the flow direction. © 2023 Proceedings IMCIC - International Multi-Conference on Complexity, Informatics and Cybernetics.

关键词： Photolithography

来源：评论

学校读者我要写书评

暂无评论

Advancing optothermal manipulation:decoupling temperature and flow fields in quasi-isothermal microscale streaming

引用

Light(Science & Applications) 2023年第9期12卷 1713-1714页

作者： Youngsun Kim Yuebing Zheng Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX78712USA Walker Department of Mechanical Engineering The University of Texas at AustinAustinTX78712USA

By decoupling temperature and flow fields through symmetry-correlated laser scan sequences,ISO-FLUCS enables quasi-isothermal optofluidic microscale *** technique offers precise control over fluid manipulation while m... 详细信息

关键词： thermal isothermal flow

来源：评论

学校读者我要写书评

暂无评论

Stability of gravity-driven viscous films flowing down a soft cylinder

引用

Physical Review Fluids 2024年第9期9卷 094001页

作者： Youchuang Chao Lailai Zhu Zijing Ding Tiantian Kong Juntao Chang Ziao Wang School of Energy Science and Engineering Department of Mechanical Engineering Department of Biomedical Engineering School of Medicine

We study the stability of gravity-driven viscous liquid films flowing down a vertical cylinder that is uniformly coated with a thin layer of elastic solids. Combining the gravity-driven viscous flows with the elastic deformation of the coated soft layer, we formulate a long-wave model to describe the evolution of a film flow-soft structure coupled system. Based on the model, we systematically examine the impact of the coating properties, including the elasticity and thickness on the temporal and spatiotemporal stability. Temporal stability analysis shows that the soft layer plays a dual role, namely, the elasticity acts as a destabilizing factor, leading to large deformations of both film interface and soft surface. However, due to the geometrical effect, increasing the layer thickness stabilizes the Rayleigh-Plateau instability. By contrast, the linear phase speed is always enhanced with increasing the elasticity or the thickness of the coated layer. We then analyze the spatiotemporal nature of free-surface instabilities and find that the elasticity can trigger the film flows from being absolutely unstable to convectively unstable. Transient numerical solutions of the full asymptotic model further verify the predictions from linear stability analysis, and more importantly, reveal the nonlinear effect of the softness. Compared to liquid films falling down the cylinder with rigid walls, the soft surface can enhance the coalescence of faster, larger sliding droplets with preceding slower, smaller sliding ones, thus resulting in a more unstable system. Our study highlights the potential of coating a thin layer of soft materials onto the walls of substrate to regulate the dynamics of liquid film systems, and may have implications for the emerging bioinspired applications; for instance, the large-scale collection and transport of water on flexible microfiber arrays.

关键词： Flow instability Instability of free-surface flows Interfacial flows Surface & interfacial phenomena Thin fluid films

来源：评论

学校读者我要写书评

暂无评论

Plantar Pressure Response for Classification of Parkinson's Disease patients with Gait Abnormalities using Machine Learning 3

Plantar Pressure Response for Classification of Parkinson's ...

引用

3rd International Conference on Digital Futures and Transformative Technologies, ICoDT2 2023

作者： Afzal, Namra Ramzan, Bisma Fatima, Noor Khalid, Mina Waris, Asim Gilani, Syed Omer Anwar, Muhammad Nabeel National University of Science and Technology H12 School of Mechanical and Manufacturing Engineering Biomedical Engineering Department Islamabad Pakistan University of Engineering and Technology Department of Biomedical Engineering Lahore Pakistan

ISBN: (纸本)9798350330816

Parkinson's disease is a prevalent neuro-degenerative ailment which has a negative impact on people's standard of living, since it causes motor impairments such as instability of posture and gait abnormalities. The gait signal is one of the most useful elements for identifying and diagnosing movement abnormalities produced by malfunctions in areas of the brain and nervous system in Parkinson's disease patients. The main purpose of this study is to give a more accurate way of distinguishing PD patients from healthy subjects who have gait abnormalities and those who don't via vertical ground reaction force (VGRF) using different machine learning models by utilizing the Physionet NDD gait database. The gait dataset was pre- processed using the median filter. Decision tree classifier, Random Forest classifier, and K-nearest neighbor (KNN) were used to classify healthy Controls and Parkinson disease patients after selecting the most important features. The accuracy of the decision tree classifier, KNN, and Random Forest was 88%, 85.7%, and 78% respectively. The study using the VGRF gait dataset revealed that these models could achieve state-of-the-art performance in the binary classification of PD and healthy controls. © 2023 IEEE.

关键词： Median filters

来源：评论

学校读者我要写书评

暂无评论

Structural Analysis of Thumb Mechanism Exoskeleton Design for Post-Stroke Rehabilitation

Structural Analysis of Thumb Mechanism Exoskeleton Design fo...

引用

2023 International Conference on Advanced Mechatronics, Intelligent Manufacture and Industrial Automation, ICAMIMIA 2023

作者： Qoryah, Rika Dwi Hidayatul Guntur, Harus Laksana Nurhadi, Hendro Prastyo, Handri Kristianta, Franciscus Xaverius Chandika, Shendy Institut Teknologi Sepuluh Nopember Graduate Program of Mechanical Engineering Department Surabaya Indonesia Institut Teknologi Sepuluh Nopember Mechanical Engineering Department Surabaya Indonesia Institut Teknologi Sepuluh Nopember Mechanical Engineering Department Surabaya Indonesia University of Jember Undergraduate Program Mechanical Engineering Department Jember Indonesia University of Jember Mechanical Engineering Department Jember Indonesia

ISBN: (纸本)9798350309225

Stroke is the second cause of death and the third cause of disability in the world. Stroke is a disease caused by a clot in the artery that supplies blood to the brain (ischemia). Rehabilitation is a solution to restore the function of parts of the body that have been disturbed by a stroke. Therefore, exoskeleton robots for stroke therapy are one solution to provide good rehabilitation. The exoskeleton robot supports healthy human hand movements and considers the safety and comfort factors during rehabilitation. The exoskeleton in this research uses a cable and sheath transmission mechanism with a locally situated motor as a design mechanism that guarantees safety and comfort. The design strength can be determined using ANSYS static structural assistance software so that the maximum stress in links 1, 2, and 3 is known within safe limits with anthropometric loading. Apart from that, the static structural simulation results show that link 1 can withstand a maximum load of 20 N or more in the X-axis loading, a load of 15 N in the Y-axis loading, and a load of 15 N in the Y-axis loading, and a load of 10 N in the Z-axis loading. Link 2 can withstand a maximum load of 10 N in the X-axis load and 20 N or more in the Y-axis load. Meanwhile, link 3 can withstand a maximum load of 20 N in the X-axis load and below 10 N in the Y-axis load. © 2023 IEEE.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Change of Electrical and Transport Properties of Nickel Oxide by Carrier Concentration and Temperature through First‑Principle Calculations

引用

Nanomanufacturing and Metrology 2023年第4期6卷 109-118页

作者： Nayem Md.Reza Shah Chang‑Dong Yeo Minyeong Choi Yang‑Ki Hong Jeong H.You Department of Mechanical Engineering Texas Tech UniversityLubbockTX 79409USA Department of Electrical and Computer Engineering and Material Science Ph.D.Program The University of AlabamaTuscaloosaAL 35487USA Department of Mechanical Engineering School of EngineeringUniversity of St.ThomasSt.PaulMN 55105USA

Nickel is typically used as one of the main components in electrical contact devices or *** oxide(NiO)is usually formed on the surfaces of electrodes and can negatively impact system performance by introducing electrical contact *** thermal,electrical,and transport properties of NiO,as a Mott insulator or a p-type semiconductor,can be altered by operating and environmental conditions such as temperature and stress/strain by *** this study,we inves-tigate the fundamental material properties of NiO through the first-principle ***,we obtain and compare the lattice parameter,magnetic moment,and electronic structure for NiO via the WIEN2K simulations with four different poten-tials(i.e.,GGA,GGA+U,LSDA,and LSDA+U).Then,using the WIEN2K simulation results with LSDA+U potential that produces a highly accurate bandgap for NiO,we calculate the electrical conductivity and electrical part of the thermal conductivity of nickel and NiO as a function of temperature and carrier concentration through the BoltzTraP *** simulation results revealed that the electrical conductivity relative to the relaxation time for NiO increases with the carrier concentration,while it shows a slightly decreasing trend with temperature under a fixed carrier *** contrast,the electrical part of the thermal conductivity shows an increasing trend considering carrier concentration and temperature.

关键词： Nickel oxide Magnetic moments Density of states Seebeck coefcient Electrical conductivity

来源：评论

学校读者我要写书评

暂无评论

Enhancing waste sorting and recycling efficiency: robust deep learning-based approach for classification and detection

引用

Neural Computing and Applications 2025年第6期37卷 4567-4583页

作者： Sayem, Faizul Rakib Islam, Md. Sakib Bin Naznine, Mansura Nashbat, Mohammad Hasan-Zia, Mazhar Kunju, Ali K Ansaruddin Khandakar, Amith Ashraf, Azad Majid, Molla Ehsanul Kashem, Saad Bin Abul Chowdhury, Muhammad E. H. Department of Electrical and Electronic Engineering University of Dhaka Dhaka Bangladesh Department of Biomedical Engineering Military Institute of Science and Technology Dhaka Bangladesh Department of Computer Science & Engineering Rajshahi University of Engineering & Technology Rajshahi6204 Bangladesh Chemical Engineering Department University of Doha for Science and Technology Doha Qatar Department of Electrical Engineering Qatar University Doha2713 Qatar Computer Applications Department Academic Bridge Program Qatar Foundation Doha Qatar Department of Computing Science AFG College With the University of Aberdeen Doha Qatar

Given the severity of waste pollution as a major environmental concern, intelligent and sustainable waste management is becoming increasingly crucial in both developed and developing countries. The material composition and volume of urban solid waste are key considerations in processing, managing, and utilizing city waste. Deep learning technologies have emerged as viable solutions to address waste management issues by reducing labor costs and automating complex tasks. However, the limited number of trash image categories and the inadequacy of existing datasets have constrained the proper evaluation of machine learning model performance across a large number of waste classes. In this paper, we present robust waste image classification and object detection studies using deep learning models, utilizing 28 distinct recyclable categories of waste images comprising a total of 10,406 images. For the waste classification task, we proposed a novel dual-stream network that outperformed several state-of-the-art models, achieving an overall classification accuracy of 83.11%. Additionally, we introduced the GELAN-E (generalized efficient layer aggregation network) model for waste object detection tasks, obtaining a mean average precision (mAP50) of 63%, surpassing other state-of-the-art detection models. These advancements demonstrate significant progress in the field of intelligent waste management, paving the way for more efficient and effective solutions. © The Author(s) 2024.

关键词： Deep learning for waste management Intelligent waste management Object detection in waste management Sustainable waste processing Urban solid waste Waste image classification

来源：评论

学校读者我要写书评

暂无评论

Identification of metal-air batteries from water energy harvesters

引用

Droplet 2023年第4期2卷 63-71页

作者： Xiaote Xu Xiaodan Yang Zhuomin Zhang Ying Hong Shiyuan Liu Yao Shan Zehua Peng Siyuan Wang Xi Yao Zhengbao Yang Department of Mechanical and Aerospace Engineering Hong Kong University of Science and TechnologyHong KongChina Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Biomedical Sciences City University of Hong KongHong KongChina

Capillary‐enabled water energy harvesters(WEHs)are capable of generating directcurrent electricity ***,active‐metal electrodes can introduce metal–air batteries in these *** the nearly identical device structures and output characteristics of these two technologies,it is essential to distinguish between ***,we present a systematic study of the water‐activated metal–air battery(WMB)through theoretical analyses and experimental *** conclude the general formation rules of the WMB from a material and device‐structure ***,we provide a comparative summary of various WEHs and WMBs for easy *** aim to improve the comprehension of metal–air batteries in the field of WEHs and assist in distinguishing between these technologies.

关键词： battery energy generating

来源：评论

学校读者我要写书评

暂无评论

Advancing Locomotion Control of a Quadruped Robot: Harnessing Hybrid Control Algorithms and Digital Twin Technology 10

Advancing Locomotion Control of a Quadruped Robot: Harnessin...

引用

10th International Conference on Automation, Robotics, and Applications, ICARA 2024

作者： Du, Yixiong Liu, Zhuang Zhang, Xuping City University of Hong Kong Department of Biomedical Engineering Hong Kong Hong Kong Aarhus University Department of Mechanical and Production Engineering Aarhus Denmark

ISBN: (纸本)9798350394245

In order to achieve effective locomotion in complex terrain, it is crucial to implement a robust dynamics control scheme for the quadruped robot. This paper proposes a novel approach to locomotion control, utilizing both model predictive control (MPC) and sliding mode control (SMC). The proposed control scheme decomposes the whole control problem into body level and leg level. Firstly, the dynamics of the body are simplified and summarized into quadprog problem (QP), and the MPC-based controller is designed to solve the problem which is constrained by the range of ground reaction forces (GRFs) and the friction cone. Secondly, the neural network-based adaptive faster fixed-time nonsingular terminal sliding mode control (NTSMC) is utilized for the leg control. Thirdly, the proposed control scheme is verified of a trotting gait with the speed of 0.5 m/s and the simulation results indicate that the swing leg control has a tracking error below 0.01 m, and the body orientation errors are below 0.005 rad for roll, pitch, and yaw. Lastly, the proposed control scheme is validated with a digital twin in Webots. © 2024 IEEE.

关键词： Sliding mode control

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：