Timothy Wolfe Bretl

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2020

When Is a Helix Stable?

Borum, A. & Bretl, T., Aug 21 2020, In : Physical review letters. 125, 8, 088001.

Research output: Contribution to journalArticle

2019

Epstein, Project Maven, and Some Reasons to Think about Where We Get Our Funding [Ethical, Legal, and Societal Issues]

Bretl, T., Righetti, L. & Madhavan, R., Dec 2019, In : IEEE Robotics and Automation Magazine. 26, 4, p. 8-13 6 p., 8931077.

Research output: Contribution to journalArticle

Large-area MRI-compatible epidermal electronic interfaces for prosthetic control and cognitive monitoring

Tian, L., Zimmerman, B., Akhtar, A., Yu, K. J., Moore, M., Wu, J., Larsen, R. J., Lee, J. W., Li, J., Liu, Y., Metzger, B., Qu, S., Guo, X., Mathewson, K. E., Fan, J. A., Cornman, J., Fatina, M., Xie, Z., Ma, Y., Zhang, J. & 9 others, Zhang, Y., Dolcos, F., Fabiani, M., Gratton, G., Bretl, T., Hargrove, L. J., Braun, P. V., Huang, Y. & Rogers, J. A., Mar 1 2019, In : Nature biomedical engineering. 3, 3, p. 194-205 12 p.

Research output: Contribution to journalArticle

2018

Controlling sensation intensity for electrotactile stimulation in human-machine interfaces

Akhtar, A., Sombeck, J., Boyce, B. & Bretl, T., Apr 2018, In : Science Robotics. 3, 17, eaap9770.

Research output: Contribution to journalArticle

Open Access

Motion planning of fully actuated closed kinematic chains with revolute joints: A comparative analysis

Sintov, A., Borum, A. & Bretl, T., Oct 2018, In : IEEE Robotics and Automation Letters. 3, 4, p. 2886-2893 8 p.

Research output: Contribution to journalArticle

Teaching undergraduate courses on robotics and control in prison

Bretl, T., Sep 2018, Mechanical Engineering, 140, 9, p. S11-S16.

Research output: Contribution to specialist publicationArticle

Open Access

The performance of 9-11-year-old children using an SSVEP-based BCI for target selection

Norton, J. J. S., Mullins, J., Alitz, B. E. & Bretl, T., Jul 27 2018, In : Journal of Neural Engineering. 15, 5, 056012.

Research output: Contribution to journalArticle

2017

Estimation of distal arm joint angles from EMG and shoulder orientation for transhumeral prostheses

Akhtar, A., Aghasadeghi, N., Hargrove, L. & Bretl, T., Aug 2017, In : Journal of Electromyography and Kinesiology. 35, p. 86-94 9 p.

Research output: Contribution to journalArticle

Reduction of Sufficient Conditions for Optimal Control Problems with Subgroup Symmetry

Borum, A. & Bretl, T., Jul 2017, In : IEEE Transactions on Automatic Control. 62, 7, p. 3209-3224 16 p., 7742897.

Research output: Contribution to journalArticle

The elicitation of steady-state visual evoked potentials during sleep

Norton, J. J. S., Umunna, S. & Bretl, T., Apr 1 2017, In : Psychophysiology. 54, 4, p. 496-507 12 p.

Research output: Contribution to journalArticle

2016

An Epidermal Stimulation and Sensing Platform for Sensorimotor Prosthetic Control, Management of Lower Back Exertion, and Electrical Muscle Activation

Xu, B., Akhtar, A., Liu, Y., Chen, H., Yeo, W. H., Park, S., Boyce, B., Kim, H., Yu, J., Lai, H. Y., Jung, S., Zhou, Y., Kim, J., Cho, S., Huang, Y., Bretl, T. & Rogers, J. A., Jan 1 2016, In : Advanced Materials. 28, 22, p. 4462-4471 10 p.

Research output: Contribution to journalArticle

Epidermal mechano-acoustic sensing electronics for cardiovascular diagnostics and human-machine interfaces

Liu, Y., Norton, J. J. S., Qazi, R., Zou, Z., Ammann, K. R., Liu, H., Yan, L., Tran, P. L., Jang, K. I., Lee, J. W., Zhang, D., Kilian, K. A., Jung, S. H., Bretl, T., Xiao, J., Slepian, M. J., Huang, Y., Jeong, J. W. & Rogers, J. A., Nov 2016, In : Science Advances. 2, 11, e1601185.

Research output: Contribution to journalArticle

Sufficient conditions for a path-connected set of local solutions to an optimal control problem

Borum, A. & Bretl, T., Jan 1 2016, In : SIAM Journal on Applied Mathematics. 76, 3, p. 976-999 24 p.

Research output: Contribution to journalArticle

2015

An SSVEP-based brain-computer interface for text spelling with adaptive queries that maximize information gain rates

Akce, A., Norton, J. J. S. & Bretl, T. W., Sep 1 2015, In : IEEE Transactions on Neural Systems and Rehabilitation Engineering. 23, 5, p. 857-866 10 p., 6971133.

Research output: Contribution to journalArticle

Soft, curved electrode systems capable of integration on the auricle as a persistent brain-computer interface

Norton, J. J. S., Lee, D. S., Lee, J. W., Lee, W., Kwon, O., Won, P., Jung, S. Y., Cheng, H., Jeong, J. W., Akce, A., Umunna, S., Na, I., Kwon, Y. H., Wang, X. Q., Liu, Z. J., Paik, U., Huang, Y., Bretl, T., Yeo, W. H., Rogers, J. A. & 1 others, Bao, Z., Mar 31 2015, In : Proceedings of the National Academy of Sciences of the United States of America. 112, 13, p. 3920-3925 6 p.

Research output: Contribution to journalArticle

2014

Controlling many differential-drive robots with uniform control inputs

Becker, A., Onyuksel, C., Bretl, T. & McLurkin, J., Nov 11 2014, In : International Journal of Robotics Research. 33, 13, p. 1626-1644 19 p.

Research output: Contribution to journalArticle

Interpreting lateral dynamic weight shifts using a simple inverted pendulum model

Kennedy, M. W., Bretl, T. & Schmiedeler, J. P., May 2014, In : Gait and Posture. 40, 1, p. 134-139 6 p.

Research output: Contribution to journalArticle

2013

A brain-machine interface to navigate a mobile robot in a planar workspace: Enabling humans to fly simulated aircraft with EEG

Akce, A., Johnson, M., Dantsker, O. & Bretl, T. W., Mar 19 2013, In : IEEE Transactions on Neural Systems and Rehabilitation Engineering. 21, 2, p. 306-318 13 p., 6381524.

Research output: Contribution to journalArticle

Materials and optimized designs for human-machine interfaces via epidermal electronics

Jeong, J. W., Yeo, W. H., Akhtar, A., Norton, J. J. S., Kwack, Y. J., Li, S., Jung, S. Y., Su, Y., Lee, W., Xia, J., Cheng, H., Huang, Y., Choi, W. S., Bretl, T. & Rogers, J. A., Dec 17 2013, In : Advanced Materials. 25, 47, p. 6839-6846 8 p.

Research output: Contribution to journalArticle

Mechanics and quasi-static manipulation of planar elastic kinematic chains

Bretl, T. & McCarthy, Z., Jan 1 2013, In : IEEE Transactions on Robotics. 29, 1, p. 1-14 14 p., 6327684.

Research output: Contribution to journalArticle

2012

Approximate steering of a unicycle under bounded model perturbation using ensemble control

Becker, A. & Bretl, T., 2012, In : IEEE Transactions on Robotics. 28, 3, p. 580-591 12 p., 6157635.

Research output: Contribution to journalArticle

A stochastic control approach to optimally designing hierarchical flash sets in P300 communication prostheses

Ma, R., Aghasadeghi, N., Jarzebowski, J., Bretl, T. & Coleman, T. P., Jan 1 2012, In : IEEE Transactions on Neural Systems and Rehabilitation Engineering. 20, 1, p. 102-112 11 p., 6112238.

Research output: Contribution to journalArticle

Control and planning of 3-D dynamic walking with asymptotically stable gait primitives

Gregg, R. D., Tilton, A. K., Candido, S., Bretl, T. & Spong, M. W., Jan 1 2012, In : IEEE Transactions on Robotics. 28, 6, p. 1415-1423 9 p., 6266755.

Research output: Contribution to journalArticle

Minimum-time optimal control of many robots that move in the same direction at different speeds

Bretl, T., Apr 1 2012, In : IEEE Transactions on Robotics. 28, 2, p. 351-363 13 p., 6087289.

Research output: Contribution to journalArticle

Modeling, control, and analysis of a robotic assist device

Shorter, K. A., Li, Y., Bretl, T. & Hsiao-Wecksler, E. T., Dec 2012, In : Mechatronics. 22, 8, p. 1067-1077 11 p.

Research output: Contribution to journalArticle

2011

A feedback information-theoretic approach to the design of brain-computer interfaces

Omar, C., Akce, A., Johnson, M., Bretl, T., Ma, R., Maclin, E., Mccormick, M. & Coleman, T. P., Jan 1 2011, In : International Journal of Human-Computer Interaction. 27, 1, p. 5-23 19 p.

Research output: Contribution to journalArticle

Estimating system state during human walking with a powered ankle-foot orthosis

Li, D. Y., Becker, A., Shorter, K. A., Bretl, T. & Hsiao-Wecksler, E. T., Oct 1 2011, In : IEEE/ASME Transactions on Mechatronics. 16, 5, p. 835-844 10 p., 5985534.

Research output: Contribution to journalArticle

2010

Comments on "an optimality principle governing human walking"

Bretl, T., Arechavaleta, G., Akce, A. & Laumond, J. P., Dec 1 2010, In : IEEE Transactions on Robotics. 26, 6, p. 1105-1106 2 p., 5624646.

Research output: Contribution to journalArticle

2008

Motion planning for legged robots on varied terrain

Hauser, K., Bretl, T., Latombe, J. C., Harada, K. & Wilcox, B., Nov 1 2008, In : International Journal of Robotics Research. 27, 11-12, p. 1325-1349 25 p.

Research output: Contribution to journalArticle

Testing static equilibrium for legged robots

Bretl, T. W. & Lall, S., Aug 1 2008, In : IEEE Transactions on Robotics. 24, 4, p. 794-807 14 p.

Research output: Contribution to journalArticle

2006
2005

Toward autonomous free-climbing robots

Bretl, T., Latombe, J. C. & Rock, S., Dec 1 2005, In : Springer Tracts in Advanced Robotics. 15, p. 6-15 10 p.

Research output: Contribution to journalArticle