检索结果-内蒙古大学图书馆

Investigating Relationships between Balance Confidence and Balance Ability in Older Adults

Journal of Aging Research 2021年第1期2021卷 3214366页

作者： Thompson, Lara A. Badache, Mehdi Brusamolin, Joao Augusto Renno Savadkoohi, Marzieh Guise, Jelani De Paiva, Gabriel Velluto Suh, Pius Sanchez Guerrero, Pablo Shetty, Devdas Biomedical Engineering Program Department of Mechanical Engineering School of Engineering and Applied Sciences University of the District of Columbia 4200 Connecticut Ave. NW Washington 20008 DC United States Department of Mechanical Engineering School of Engineering and Applied Sciences University of the District of Columbia 4200 Connecticut Ave. NW Washington 20008 DC United States School of Engineering and Applied Sciences University of the District of Columbia 4200 Connecticut Ave. NW Washington 20008 DC United States Department of Electrical and Computer Engineering School of Engineering and Applied Sciences University of the District of Columbia 4200 Connecticut Ave. NW Washington 20008 DC United States

Increasing balance confidence in older individuals is important towards improving their quality of life and reducing activity avoidance. Here, we investigated if balance confidence (perceived ability) and balance performance (ability) in older adults were related to one another and would improve after balance training. The relationship of balance confidence in conjunction with balance performance for varied conditions (such as limiting vision, modifying somatosensory cues, and also base of support) was explored. We sought to determine if balance confidence and ability, as well as their relationship, could change after several weeks of training. Twenty-seven healthy participants were trained for several weeks during standing and walking exercises. In addition, seven participants with a higher risk of imbalance leading to falls (survivors of stroke) were also trained. Prior to and after training, balance ability and confidence were assessed via the Balance Error Scoring System (BESS) and Activities Specific Balance Confidence (ABC) Scale, respectively. Both groups showed improvements in balance abilities (i.e., BESS errors significantly decreased after training). Balance confidence was significantly higher in the healthy group than in the stroke group;however, ABC results reflected that balance confidence did not significantly increase after training for each. The correlations between balance ability and balance confidence were explored. Encouragingly, healthy participants displayed a negative correlation between BESS errors and ABC (i.e., enhancements in balance confidence (increases in ABC Scale results) were related to improvements in balance ability (decreases in BESS errors)). For the stroke participants, despite improvements in balance ability, our results showed that there was no relation to balance confidence (i.e., no correlation between BESS errors and ABC) in this group. © 2021 Lara A. Thompson et al.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Keyfilter-Aware Real-Time UAV Object Tracking

Keyfilter-Aware Real-Time UAV Object Tracking

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： Yiming Li Changhong Fu Ziyuan Huang Yinqiang Zhang Jia Pan School of Mechanical Engineering Tongji University Shanghai China Advanced Robotics Centre National University of Singapore Singapore Department of Mechanical Engineering Technical University of Munich Munich Germany Computer Science Department The University of Hong Kong Hong Kong China

ISBN: (数字)9781728173955

ISBN: (纸本)9781728173962

Correlation filter-based tracking has been widely applied in unmanned aerial vehicle (UAV) with high efficiency. However, it has two imperfections, i.e., boundary effect and filter corruption. Several methods enlarging the search area can mitigate boundary effect, yet introducing undesired background distraction. Existing frame-by-frame context learning strategies for repressing background distraction nevertheless lower the tracking speed. Inspired by keyframe-based simultaneous localization and mapping, keyfilter is proposed in visual tracking for the first time, in order to handle the above issues efficiently and effectively. Keyfilters generated by periodically selected keyframes learn the context intermittently and are used to restrain the learning of filters, so that 1) context awareness can be transmitted to all the filters via keyfilter restriction, and 2) filter corruption can be repressed. Compared to the state-of-the-art results, our tracker performs better on two challenging benchmarks, with enough speed for UAV real-time applications.

关键词： Unmanned aerial vehicles Correlation Visualization Object tracking Frequency-domain analysis Real-time systems

来源：评论

学校读者我要写书评

暂无评论

Impact-Aware Online Motion Planning for Fully-Actuated Bipedal Robot Walking

Impact-Aware Online Motion Planning for Fully-Actuated Biped...

引用

American Control Conference

作者： Yuan Gao Xingye Da Yan Gu Department of Mechanical Engineering University of Massachusetts Lowell Lowell MA U.S.A. AI and Robotics Research and Development Engineer Nvidia Coporation

ISBN: (数字)9781538682661

ISBN: (纸本)9781538682678

The ability to track a general walking path with specific timing is crucial to the operational safety and reliability of bipedal robots for avoiding dynamic obstacles, such as pedestrians, in complex environments. This paper introduces a motion planner that generates the desired full-body motion in real-time for fully-actuated bipedal robotic walking. The key novelty of the proposed planner lies in its capability of online generation of impact-aware non-periodic motions along general walking paths that respect the discrete impact behaviors. The planner is derived based on full-order modeling of hybrid walking dynamics and the proposed construction of keyframe posture library. Simulation results of a three-dimensional bipedal robot are presented to confirm the effectiveness of the proposed planner in generating full-body motions for each walking step within 0.6 second.

关键词： walking Robot operating security motion planning Pedestrians PAVEMENTS

来源：评论

学校读者我要写书评

暂无评论

Triple-Layered Carbon-SiO₂ Composite Membrane for High Energy Density and Long Cycling Li-S Batteries

引用

ACS Nano 2019年第5期13卷 5900-5909页

作者： Kou, Wei Li, Xiangcun Liu, Yang Zhang, Xiaopeng Yang, Shaoran Jiang, Xiaobin He, Gaohong Dai, Yan Zheng, Wenji Yu, Guihua State Key Laboratory of Fine Chemicals Chemical Engineering Department Dalian University of Technology Dalian 116024 China Department of Mechanical and Biomedical Engineering City University of Hong Kong 83 Tat Chee Avenue Hong Kong Hong Kong Materials Science and Engineering Program Department of Mechanical Engineering University of Texas at Austin Austin 78712 TX United States

Here we report a highly scalable yet flexible triple-layer structured porous C/SiO2 membrane via a facile phase inversion method for advancing Li-sulfur battery technology. As a multifunctional current-collector-free ... 详细信息

Here we report a highly scalable yet flexible triple-layer structured porous C/SiO₂ membrane via a facile phase inversion method for advancing Li-sulfur battery technology. As a multifunctional current-collector-free cathode, the conductive dense layer of the C/SiO₂ membrane offers hierarchical macropores as an ideal sulfur host to alleviate the volume expansion of sulfur species and facilitate ion/electrolyte transport for fast kinetics, as well as spongelike pores to enable high sulfur loading. The triple-layer structured membrane cathode enables the filling of most sulfur species in the macropores and additional loading of a thin sulfur slurry on the membrane surface, which facilitates ion/electrolyte transport with faster kinetics than the conventional S/C slurry-based cathode. Furthermore, density functional theory simulations and visual adsorption measurements confirm the critical role of the doped SiO₂ nanoparticles (∼10 nm) in the asymmetric C membrane in suppressing the shuttle effect of polysulfides via chemisorption and electrocatalysis. The rationally designed C/SiO₂ membrane cathodes demonstrate long-term cycling stability of 300 cycles at a high sulfur loading of 2.8 mg cm^-2 with a sulfur content of ∼75%. This scalable yet flexible self-supporting cathode design presents a useful strategy for realizing practical applications of high-performance Li-S batteries. © 2019 American Chemical Society.

关键词： C/SiO2 membrane energy storage Li-S batteries multifunctional phase-inversion

来源：评论

学校读者我要写书评

暂无评论

A PhD distance learning program: A unique educational collaboration with the university of Texas and los alamos national laboratory

A PhD distance learning program: A unique educational collab...

引用

2019 Transactions of the American Nuclear Society, ANS 2019

作者： Landsberger, Sheldon Charlton, William Clarno, Kevin Boravino, Dan Mace, Jonathan Diaz, Tammy University of Texas at Austin Walker Department of Mechanical Engineering Nuclear and Radiation Engineering Program United States Los Alamos National Laboratory United States

来源：评论

学校读者我要写书评

暂无评论

User preference of applied torque characteristics for bilateral powered ankle exoskeletons

User preference of applied torque characteristics for bilate...

引用

IEEE/RAS-EMBS International Conference on Biomedical robotics and Biomechatronics (BioRob)

作者： Kimberly A. Ingraham C. David Remy Elliott J. Rouse Department of Mechanical Engineering Robotics Institute University of Michigan Ann Arbor MI USA Institue for Nonlinear Mechanics University of Stuttgart Stuttgart Germany

ISBN: (数字)9781728159072

ISBN: (纸本)9781728159089

For robotic ankle exoskeletons, the choice of controller and the many associated controller parameters (e.g. magnitude or timing of assistance) directly affect the user's performance, comfort, and biomechanics. Some studies have proposed tuning such controllers for individual users using optimization techniques to minimize (or maximize) a physiological objective, such as metabolic energy expenditure. One drawback to this approach is that it necessitates having one predefined, measurable objective function that is relevant in all situations. In reality, people may prioritize many different less-quantifiable metrics, such as stability, comfort, pain, or perceived effort, in any given situation. In this paper, we present a method of exoskeleton controller customization that is based on subject preference, which likely encodes many of these subjective cost functions at once. In this pilot study, two subjects self-tuned their own controller parameters in two dimensions, by directly manipulating the magnitude and timing of bilateral ankle exoskeleton assistance using a touch screen tablet interface. Subjects exhibited high repeatability in identifying their preferred exoskeleton parameters at each of three walking speeds (coefficient of variation between 0.914.5%). Subjects' preferences differed from each other, which highlights the importance of individual customization. The results from this pilot study will inform future experiments that incorporate rigorous measurement of subject preference into the control of robotic ankle exoskeletons. This research has the potential to provide more complete insights into important elements of exoskeleton control that will be useful outside of the steady-state, laboratory environment.

关键词： Exoskeletons Torque Legged locomotion Timing Robots Physiology Brushless motors

来源：评论

学校读者我要写书评

暂无评论

Dynamics and Aerial Attitude Control for Rapid Emergency Deployment of the Agile Ground Robot AGRO

Dynamics and Aerial Attitude Control for Rapid Emergency Dep...

引用

2020 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Daniel J. Gonzalez Mark C. Lesak Andres H. Rodriguez Joseph A. Cymerman Christopher M. Korpela Robotics Research Center United States Military Academy West Point NY USA Army Cyber Institute Department of Civil and Mechanical Engineering

ISBN: (数字)9781728162126

ISBN: (纸本)9781728162133

In this work we present a Four-Wheeled Independent Drive and Steering (4WIDS) robot named AGRO and a method of controlling its orientation while airborne using wheel reaction torques. This is the first documented use of independently steerable wheels to both drive on the ground and achieve aerial attitude control when thrown. Inspired by a cat's self-righting reflex, this capability was developed to allow emergency response personnel to rapidly deploy AGRO by throwing it over walls and fences or through windows without the risk of it landing upside down. It also allows AGRO to drive off of ledges and ensure it lands on all four wheels. We have demonstrated a successful thrown deployment of AGRO.A novel parametrization and singularity analysis of 4WIDS kinematics reveals independent yaw authority with simultaneous adjustment of the ratio between roll and pitch authority. Simple PD controllers allow for stabilization of roll, pitch, and yaw. These controllers were tested in a simulation using derived dynamic equations of motion, then implemented on the AGRO prototype. An experiment comparing a controlled and non-controlled fall was conducted in which AGRO was dropped from a height of 0.85 m with an initial roll and pitch angle of 16 degrees and -23 degrees respectively. With the controller enabled, AGRO can use the reaction torque from its wheels to stabilize its orientation within 402 milliseconds.

关键词： Torque Attitude control Wheels Prototypes Mobile robots Mathematical model Personnel

来源：评论

学校读者我要写书评

暂无评论

Advancements in flexible Perovskite solar cells and their integration into self-powered wearable optoelectronic systems

Advanced Powder Materials

引用

Advanced Powder Materials 2025年第4期4卷

作者： Ghazanfar Nazir Adeela Rehman Jagadis Gautam Muhammad Ikram Sajjad Hussain Sikandar Aftab Kwang Heo Seul-Yi Lee Soo-Jin Park Department of Nanotechnology and Advanced Materials Engineering Hybrid Materials Research Center (HMC) Sejong University Seoul 05006 Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seoul 03722 Republic of Korea Department of Mechanical Engineering Kyung Hee University Yongin 17104 Republic of Korea Solar Cell Applications Research Lab Department of Physics Government College University Lahore Lahore 54000 Punjab Pakistan Department of Artificial Intelligence and Robotics Sejong University Seoul 05006 Republic of Korea Department of Advanced Materials Engineering Kyung Hee University Yongin 17104 Republic of Korea

Driven by rapid advancements in smart wearable technologies and perovskite photovoltaics, flexible perovskite solar cells (FPSCs) have emerged as highly promising autonomous power sources, poised to transform the next generation of mobile energy systems, portable electronics, and integrated wearable devices. For successful deployment in real-world scenarios, FPSCs must exhibit a combination of key attributes, including high power conversion efficiency, lightweight architecture, environmental robustness, and mechanical adaptability—encompassing flexibility, stretchability, and twistability. This review provides a detailed examination of the evolution, current state, and practical deployment of FPSCs, emphasizing their potential as efficient, portable energy solutions. It investigates advanced strategies for improving environmental resilience and mechanical recoverability, including the engineering of flexible substrates, deposition of high-quality perovskite films, and optimization of charge-selective interfaces. Additionally, it offers a systematic analysis of device design, fabrication protocols, scalable printing techniques, and standardized performance evaluation methods tailored for wearable FPSCs. Recent progress in enhancing the optoelectronic properties and mechanical durability of FPSCs is also critically reviewed. Ultimately, this work delivers a comprehensive perspective on FPSCs from both optoelectronic and mechanical viewpoints, identifies key challenges, and outlines future research pathways toward the seamless integration of FPSCs into multifunctional, next-generation wearable systems.

关键词： Flexible perovskite solar cells Wearable electronics Power conversion efficiency Environmental stability mechanical versatility

来源：评论

学校读者我要写书评

暂无评论

An Electric Cosmetic Prosthetic Hand with Vibrotactile Sense

An Electric Cosmetic Prosthetic Hand with Vibrotactile Sense

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Mizuki Sakuma Yuki Kito Yoshihiro Tanaka Masahiro Yoshikawa Noritaka Kawashima Department of Mechanical Engineering Nagoya Institute of Tecnology Nagoya Japan Department of Robotics and Design Engineering Osaka Institute of Tecnology Osaka Japan Noritaka Kawashima with National Rehabilitation Center for Persons with Disabilities Tokorozawa Japan

ISBN: (数字)9781728119908

ISBN: (纸本)9781728119915

Prosthetic hands are developed to replace lost hands. However, it has been hard to ensure the same level grasping and manipulating objects as human hands and the cosmetic appearance is also important. In a previous work, Rehand II: an electric and cosmetic prosthetic hand was developed. Its function is limited to simple object grasping, but it has the cosmetic appearance and is relatively light. This paper aimed to improve Rehand II by introducing tactile sense. Tactile sense is available to detect physical contact, recognize physical attributes of objects such as their softness and texture, and ensure delicate operation while handling the objects. Additionally, tactile sense is relevant to build the body recognition. We focused on vibrotactile sense from the aspects of a wide receptive field, contribution to contact detection and various frequency information involved. A simple electric and cosmetic prosthetic hand with vibrotactile sense was developed by improving Rehand II with polyvinylidene difluoride film sensors for detecting skin-propagated vibrations and soft vibrators for the feedback. The sensors were embedded at the thumb, index finger, and back of the hand of the prosthetic hand. First, recognition tests involving tapped part were conducted. Then, recognition and realistic rating tests involving operations were conducted. Results showed high recognition of tapped parts and operations and the good realistic.

关键词： Sensors Prosthetic hand Vibrations Thumb Indexes Rubber Skin

来源：评论

学校读者我要写书评

暂无评论

Development of a novel computational model for evaluating fall risk in patient room design

arXiv

引用

arXiv 2020年

作者： Novin, Roya Sabbagh Taylor, Ellen Hermans, Tucker Merryweather, Andrew Department of Mechanical Engineering and Robotics Center University of Utah United States Center for Health Design ConcordCA United States School of Computing and Robotics Center University of Utah United States

Objectives: This study proposes a computational model to evaluate patient room design layout and features that contribute to patient stability and mitigate the risk of fall. Background: While common fall risk assessment tools in nursing have an acceptable level of sensitivity and specificity, they focus on intrinsic factors and medications, making risk assessment limited in terms of how the physical environment contributes to fall risk. Methods: We use literature to inform a computational model (algorithm) to define the relationship between these factors and the risk of fall. We use a trajectory optimization approach for patient motion prediction. Results: Based on available data, the algorithm includes static factors of lighting, flooring, supportive objects, and bathroom doors, and dynamic factors of patient movement. This preliminary model was tested using four room designs as examples of typical room configurations. Results show the capabilities of the proposed model to identify the risk associated with different room layouts and features. Conclusions: This innovative approach to room design evaluation and resulting estimation of patient fall risk show promise as proactive evidence-based tool to evaluate the relationship of potential fall risk and room design. The development of the model highlights the challenge of heterogeneity in factors and reporting found in the studies of patient falls, which hinder our understanding of the role of the built environment in mitigating risk. A more comprehensive investigation comparing the model with actual patient falls data is needed to further refine model development. Copyright © 2020, The Authors. All rights reserved.

关键词： Risk assessment

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：