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2019 IEEE International Conference on engineering, Technology and Education, TALE 2019

作者： Maneeratana, Kuntinee Chancharoen, Ratchatin Thongnuek, Peerapat Sukmuen, Potcharawan Inkaew, Chamaiporn Suwannatthachote, Praweenya Chulalongkorn University Department of Mechanical Engineering Bangkok Thailand Chulalongkorn University Interdisciplinary Program of Biomedical Engineering Thailand Chulalongkorn University Department of Educational Communication and Technology Thailand

ISBN: (纸本)9781728126654

A short ***-style design thinking project was offered to first-year engineering students as an option in an introduction to engineering course. Using the Stanford *** bootcamp bootleg as the guideline, students went through the process - empathy, define, ideate, prototype, and test - very fast with different levels of depth. The works were evaluated using the *** rubric and found to gain limited success. In order to improve the instructional design, the formal developmental study was initiated. Using class observation, focus-group interview and comparison with similar classes, the instructional design was analyzed and weakness identified. The major problems included the student preparation, engagement, participation, core concept understanding as well as active learning activities, technology utilization, feedback and reflection, in short, the class control and facilitation. The instruction design was adjusted with detailed activities such that it would be implemented in the next iteration. © 2019 IEEE.

关键词： Students

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Investigating Relationships between Balance Confidence and Balance Ability in Older Adults

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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.

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Keyfilter-Aware Real-Time UAV Object Tracking

Keyfilter-Aware Real-Time UAV Object Tracking

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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

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

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

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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

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Integrated Assessment of Rooftop Photovoltaic Systems and Carbon Footprint for Organization: A Case Study of an Educational Facility in Thailand

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Energies 2025年第10期18卷 2485-2485页

作者： Nattapon Leeabai Natthakarn Sakaraphantip Neeraphat Kunbuala Kamonchanok Roongrueng Methawee Nukunudompanich Department of Environmental Engineering Faculty of Engineering Kasetsart University Chatuchak Bangkok 10900 Thailand CES Solar Cells Testing Center (CSSC) Pilot Plant Development and Training Institute (PDTI) King Mongkut’s University of Technology Thonburi (KMUTT) Thung Khru Bangkok 10140 Thailand Department of Industrial Engineering School of Engineering King Mongkut’s Institute of Technology Ladkrabang Lat Krabang Bangkok 10520 Thailand Green Technology Research Co. Ltd. (GTR) Dindaeng Bangkok 10400 Thailand Department of Mechanical Engineering (Energy Engineering Program) School of Engineering King Mongkut’s Institute of Technology Ladkrabang Lat Krabang Bangkok 10520 Thailand

This study presents an integrated methodology to assess and reduce greenhouse gas (GHG) emissions in institutional buildings by combining organizational carbon footprint (CFO) analysis with rooftop photovoltaic (PV) system simulation. The HM Building at King Mongkut’s Institute of Technology Ladkrabang (KMITL), Thailand, was selected as a case study to evaluate carbon emissions and the feasibility of solar-based mitigation strategies. The CFO assessment, conducted in accordance with ISO 14064-1:2018 and the Thailand Greenhouse Gas Management Organization (TGO) guidelines, identified total emissions of 1841.04 tCO2e/year, with Scope 2 electricity-related emissions accounting for 442.00 tCO2e/year. Appliance-level audits revealed that classroom activities represent 36.7% of the building’s electricity demand. These findings were validated using utility data totaling 850,000 kWh/year. A rooftop PV system with a capacity of 207 kWp was simulated using PVsyst software (version 7.1), incorporating site-specific solar irradiance and technical loss parameters. Monocrystalline modules produced the highest energy output of 292,000 kWh/year, capable of offsetting 151.84 tCO2e/year, equivalent to 34.4% of Scope 2 emissions. Economic evaluation indicated a 7.4-year payback period, with a net present value (NPV) of THB 12.49 million and an internal rate of return (IRR) of 12.79%. The integration of verified CFO data with empirical load modeling and derated PV performance projections provides a robust, scalable framework for institutional carbon mitigation. This approach supports data-driven Net Zero campus planning aligned with Thailand’s Nationally Determined Contributions (NDCs) and carbon neutrality policies.

关键词： carbon footprint for organization rooftop photovoltaic PVsyst techno-economic analysis

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

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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

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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...

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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

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

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

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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

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User preference of applied torque characteristics for bilateral powered ankle exoskeletons

User preference of applied torque characteristics for bilate...

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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

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Differential gene expression in trabecular bone osteocytes is related to the local strain and strain gradient

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Scientific reports 2025年第1期15卷 18501页

作者： Meghana Machireddy Sarah Nano Lucas Debiase Jonathan Lewis Sara Cole Jun Li Glen L Niebur University of Notre Dame Bioengineering Graduate Program Notre Dame IN USA. Department of Aerospace and Mechanical Engineering Notre Dame IN USA. Notre Dame Integrated Imaging Facility Notre Dame IN USA. Department of Applied and Computational Mathematics and Statistics University of Notre Dame Notre Dame IN USA. University of Notre Dame Bioengineering Graduate Program Notre Dame IN USA. gniebur@nd.edu. Department of Aerospace and Mechanical Engineering Notre Dame IN USA. gniebur@nd.edu.

Osteocytes regulate the response of osteoclasts and osteoblasts to mechanical loading through signaling molecules, the levels of which are controlled by post-translational modification or degradation and by differential gene transcription and translation. The magnitude and mode of bone tissue deformation that elicits a transcriptional response in individual osteocytes in situ has been difficult to quantify. We measured SOST, Wnt11, TNF, and FRZB gene expression in osteocytes within loaded and unloaded control porcine trabecular bone explants using RNAScope® and compared the local tissue level strain and strain gradient-which we used as an indicator of potential poroelastic fluid flow-in the tissue surrounding osteocytes with high vs. low gene expression. The measured expression of all four genes differed between loaded and unloaded explants, on average, with the mean SOST expression level decreasing by 45%. In the loaded explants, gene expression was altered from baseline in about 30% of the osteocytes, and they were surrounded by tissue with higher strain and strain gradient than the 20 to 25% of osteocytes that remained near baseline expression. Both deviatoric strain and hydrostatic strain gradient were sensitive and specific predictors of the mechanobiological response for individual genes as well as combinations. SOST expression was highly related to elevated strain gradient, providing evidence that osteocytes respond to fluid flow in the lacunar-canalicular system.

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