Timothy Wolfe Bretl

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Research Output

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Conference contribution
2019

Effect of discrete and continuous parameter variation on difficulty in automatic item generation

Chen, B., Zilles, C., West, M. & Bretl, T. W., Jan 1 2019, Artificial Intelligence in Education - 20th International Conference, AIED 2019, Proceedings. Isotani, S., Hastings, P., Ogan, A., McLaren, B., Millán, E. & Luckin, R. (eds.). Springer-Verlag, p. 71-83 13 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 11625 LNAI).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Every university should have a computer-based testing facility

Zilles, C., West, M., Herman, G. & Bretl, T., 2019, CSEDU 2019 - Proceedings of the 11th International Conference on Computer Supported Education. Lane, H., Zvacek, S. & Uhomoibhi, J. (eds.). SciTePress, p. 414-420 7 p. (CSEDU 2019 - Proceedings of the 11th International Conference on Computer Supported Education; vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Open Access

Making testing less trying: Lessons learned from operating a computer-based testing facility

Zilles, C., West, M., Mussulman, D. & Bretl, T., Mar 4 2019, Frontiers in Education: Fostering Innovation Through Diversity, FIE 2018 - Conference Proceedings. Institute of Electrical and Electronics Engineers Inc., 8658551. (Proceedings - Frontiers in Education Conference, FIE; vol. 2018-October).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2018

Design and Development of a Dynamically, Scaled Distributed Electric Propulsion Aircraft Testbed

Pieper, K., Perry, A., Ansell, P. & Bretl, T., Nov 29 2018, 2018 AIAA/IEEE Electric Aircraft Technologies Symposium, EATS 2018. Institute of Electrical and Electronics Engineers Inc., 8552755. (2018 AIAA/IEEE Electric Aircraft Technologies Symposium, EATS 2018).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Experimental Evaluation of the Planar Assumption in Magnetic Positioning

Hanley, D., Zhang, X., Dantas De Oliveira, A. S., Steinberg, D. & Bretl, T., Nov 13 2018, IPIN 2018 - 9th International Conference on Indoor Positioning and Indoor Navigation. Institute of Electrical and Electronics Engineers Inc., 8533828. (IPIN 2018 - 9th International Conference on Indoor Positioning and Indoor Navigation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

FEATS: Synthetic feature tracks for structure from motion evaluation

Degol, J., Lee, J. Y., Kataria, R., Yuan, D., Bretl, T. & Hoiem, D., Oct 12 2018, Proceedings - 2018 International Conference on 3D Vision, 3DV 2018. Institute of Electrical and Electronics Engineers Inc., p. 352-361 10 p. 8490986. (Proceedings - 2018 International Conference on 3D Vision, 3DV 2018).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Feature-constrained Active Visual SLAM for Mobile Robot Navigation

Deng, X., Zhang, Z., Sintov, A., Huang, J. & Bretl, T. W., Sep 10 2018, 2018 IEEE International Conference on Robotics and Automation, ICRA 2018. Institute of Electrical and Electronics Engineers Inc., p. 7233-7238 6 p. 8460721. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Improved Structure from Motion Using Fiducial Marker Matching

DeGol, J., Bretl, T. & Hoiem, D., Jan 1 2018, Computer Vision – ECCV 2018 - 15th European Conference, 2018, Proceedings. Ferrari, V., Sminchisescu, C., Hebert, M. & Weiss, Y. (eds.). Springer-Verlag Berlin Heidelberg, p. 281-296 16 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 11207 LNCS).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2017

A compliant four-bar linkage mechanism that makes the fingers of a prosthetic hand more impact resistant

Choi, K. Y., Akhtar, A. & Bretl, T., Jul 21 2017, ICRA 2017 - IEEE International Conference on Robotics and Automation. Institute of Electrical and Electronics Engineers Inc., p. 6694-6699 6 p. 7989791. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

A portable, arbitrary waveform, multichannel constant current electrotactile stimulator

Cornman, J., Akhtar, A. & Bretl, T., Aug 10 2017, 8th International IEEE EMBS Conference on Neural Engineering, NER 2017. IEEE Computer Society, p. 300-303 4 p. 8008350. (International IEEE/EMBS Conference on Neural Engineering, NER).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

ChromaTag: A Colored Marker and Fast Detection Algorithm

Degol, J., Bretl, T. & Hoiem, D., Dec 22 2017, Proceedings - 2017 IEEE International Conference on Computer Vision, ICCV 2017. Institute of Electrical and Electronics Engineers Inc., p. 1481-1490 10 p. 8237426. (Proceedings of the IEEE International Conference on Computer Vision; vol. 2017-October).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

MagPIE: A dataset for indoor positioning with magnetic anomalies

Hanley, D., Faustino, A. B., Zelman, S. D., Degenhardt, D. A. & Bretl, T., Nov 20 2017, 2017 International Conference on Indoor Positioning and Indoor Navigation, IPIN 2017. Institute of Electrical and Electronics Engineers Inc., p. 1-8 8 p. (2017 International Conference on Indoor Positioning and Indoor Navigation, IPIN 2017; vol. 2017-January).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2016

A low-cost, open-source, compliant hand for enabling sensorimotor control for people with transradial amputations

Akhtar, A., Choi, K. Y., Fatina, M., Cornman, J., Wu, E., Sombeck, J., Yim, C., Slade, P., Lee, J., Moore, J., Gonzales, D., Wu, A., Anderson, G., Rotter, D., Shin, C. & Bretl, T., Oct 13 2016, 2016 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2016. Institute of Electrical and Electronics Engineers Inc., p. 4642-4645 4 p. 7591762. (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS; vol. 2016-October).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

An improved model-based observer for inertial navigation for quadrotors with low cost IMUs

Hanley, D. & Bretl, T., 2016, AIAA Guidance, Navigation, and Control Conference. American Institute of Aeronautics and Astronautics Inc, AIAA, (2016 AIAA Guidance, Navigation, and Control Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Automatic grasp selection using a camera in a hand prosthesis

Degol, J., Akhtar, A., Manja, B. & Bretl, T., Oct 13 2016, 2016 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2016. Institute of Electrical and Electronics Engineers Inc., p. 431-434 4 p. 7590732. (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS; vol. 2016-October).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Helices, relative equilibria, and optimality on the special Euclidean group

Borum, A. & Bretl, T. W., Dec 27 2016, 2016 IEEE 55th Conference on Decision and Control, CDC 2016. Institute of Electrical and Electronics Engineers Inc., p. 185-190 6 p. 7798267. (2016 IEEE 55th Conference on Decision and Control, CDC 2016).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2015

A passive mechanism for relocating payloads with a quadrotor

Degol, J., Hanley, D., Aghasadeghi, N. & Bretl, T., Dec 11 2015, IROS Hamburg 2015 - Conference Digest: IEEE/RSJ International Conference on Intelligent Robots and Systems. Institute of Electrical and Electronics Engineers Inc., p. 4337-4342 6 p. 7353992. (IEEE International Conference on Intelligent Robots and Systems; vol. 2015-December).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2014

A two-stage suboptimal approximation for variable compliance and torque control

Geoffroy, P., Bordron, O., Mansard, N., Raison, M., Stasse, O. & Bretl, T., Jul 22 2014, 2014 European Control Conference, ECC 2014. Institute of Electrical and Electronics Engineers Inc., p. 1151-1157 7 p. 6862557. (2014 European Control Conference, ECC 2014).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Demonstration: Passive mechanical skin stretch for multiple degree-of-freedom proprioception in a hand prosthesis

Akhtar, A., Nguyen, M., Wan, L., Boyce, B., Slade, P. & Bretl, T., Jan 1 2014, Haptics: Neuroscience, Devices, Modeling, and Applications - 9th International Conference, EuroHaptics 2014, Proceedings. Auvray, M., Duriez, C., Duriez, C. & Auvray, M. (eds.). Springer-Verlag Berlin Heidelberg, p. 413-415 3 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 8619).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Efficient motion planning for quasi-static elastic rods using geometry neighborhood approximation

Roussel, O., Taïx, M. & Bretl, T., 2014, AIM 2014 - IEEE/ASME International Conference on Advanced Intelligent Mechatronics. Institute of Electrical and Electronics Engineers Inc., p. 1024-1029 6 p. 6878215. (IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Passive mechanical skin stretch for multiple degree-of-freedom proprioception in a hand prosthesis

Akhtar, A., Nguyen, M., Wan, L., Boyce, B., Slade, P. & Bretl, T., Jan 1 2014, Haptics: Neuroscience, Devices, Modeling, and Applications - 9th International Conference, EuroHaptics 2014, Proceedings. Auvray, M., Duriez, C., Duriez, C. & Auvray, M. (eds.). Springer-Verlag, p. 120-128 9 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 8619).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Playing checkers with your mind: An interactive multiplayer hardware game platform for brain-computer interfaces

Akhtar, A., Norton, J. J. S., Kasraie, M. & Bretl, T., Nov 2 2014, 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2014. Institute of Electrical and Electronics Engineers Inc., p. 1650-1653 4 p. 6943922. (2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2014).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Quasi-static manipulation of a planar elastic rod using multiple robotic grippers

Mukadam, M., Borum, A. & Bretl, T., Oct 31 2014, IROS 2014 Conference Digest - IEEE/RSJ International Conference on Intelligent Robots and Systems. Institute of Electrical and Electronics Engineers Inc., p. 55-60 6 p. 6942540. (IEEE International Conference on Intelligent Robots and Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

The relationship between energy, phase charge, impedance, and perceived sensation in electrotactile stimulation

Akhtar, A., Boyce, B. & Bretl, T., Jan 1 2014, IEEE Haptics Symposium 2014, HAPTICS 2014 - Proceedings. IEEE Computer Society, p. 69-74 6 p. 6775435. (IEEE Haptics Symposium, HAPTICS).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2013

Equilibrium configurations of a kirchhoff elastic rod under quasi-static manipulation

Bretl, T. & McCarthy, Z., Jan 1 2013, Springer Tracts in Advanced Robotics. Frazzoli, E., Roy, N., Lozano-Perez, T. & Rus, D. (eds.). Springer-Verlag Berlin Heidelberg, p. 71-87 17 p. (Springer Tracts in Advanced Robotics; vol. 86).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Inverse optimal control for deterministic continuous-time nonlinear systems

Johnson, M., Aghasadeghi, N. & Bretl, T. W., Jan 1 2013, 2013 IEEE 52nd Annual Conference on Decision and Control, CDC 2013. Institute of Electrical and Electronics Engineers Inc., p. 2906-2913 8 p. 6760325. (Proceedings of the IEEE Conference on Decision and Control).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Learning impedance controller parameters for lower-limb prostheses

Aghasadeghi, N., Zhao, H., Hargrove, L. J., Ames, A. D., Perreault, E. J. & Bretl, T., 2013, IROS 2013: New Horizon, Conference Digest - 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems. p. 4268-4274 7 p. 6696968. (IEEE International Conference on Intelligent Robots and Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Robust coverage by a mobile robot of a planar workspace

Bretl, T. & Hutchinson, S., Nov 14 2013, 2013 IEEE International Conference on Robotics and Automation, ICRA 2013. p. 4582-4587 6 p. 6631228. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sequential selection of window length for improved SSVEP-based BCI classification

Johnson, E. C., Norton, J. J. S., Jun, D., Bretl, T. & Jones, D. L., Oct 31 2013, 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2013. p. 7060-7063 4 p. 6611184. (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Towards a brain computer interface based on the N2pc event-related potential

Awni, H., Norton, J. J. S., Umunna, S., Federmeier, K. D. & Bretl, T. W., Dec 1 2013, 2013 6th International IEEE EMBS Conference on Neural Engineering, NER 2013. p. 1021-1024 4 p. 6696110. (International IEEE/EMBS Conference on Neural Engineering, NER).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2012

A brain-machine interface to navigate mobile robots along human-like paths amidst obstacles

Akce, A., Norton, J. & Bretl, T., Dec 1 2012, 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2012. p. 4084-4089 6 p. 6386024. (IEEE International Conference on Intelligent Robots and Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

A convex approach to inverse optimal control and its application to modeling human locomotion

Puydupin-Jamin, A. S., Johnson, M. & Bretl, T. W., Jan 1 2012, 2012 IEEE International Conference on Robotics and Automation, ICRA 2012. Institute of Electrical and Electronics Engineers Inc., p. 531-536 6 p. 6225317. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Approximate steering of a plate-ball system under bounded model perturbation using ensemble control

Becker, A. & Bretl, T., Dec 1 2012, 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2012. p. 5353-5359 7 p. 6385722. (IEEE International Conference on Intelligent Robots and Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Experiments in quasi-static manipulation of a planar elastic rod

Matthews, D. & Bretl, T. W., Dec 1 2012, 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2012. p. 5420-5427 8 p. 6385876. (IEEE International Conference on Intelligent Robots and Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Feedback control of many differential-drive robots with uniform control inputs

Becker, A., Onyuksel, C. & Bretl, T. W., 2012, 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2012. p. 2256-2262 7 p. 6385723

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Inverse optimal control for a hybrid dynamical system with impacts

Aghasadeghi, N., Long, A. & Bretl, T., Jan 1 2012, 2012 IEEE International Conference on Robotics and Automation, ICRA 2012. Institute of Electrical and Electronics Engineers Inc., p. 4962-4967 6 p. 6225259. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mechanics and manipulation of planar elastic kinematic chains

McCarthy, Z. & Bretl, T. W., Jan 1 2012, 2012 IEEE International Conference on Robotics and Automation, ICRA 2012. Institute of Electrical and Electronics Engineers Inc., p. 2798-2805 8 p. 6224693. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Modelling search with a binary sensor utilizing self-conjugacy of the exponential family

Bonnie, D., Candido, S., Bretl, T. & Hutchinson, S., Jan 1 2012, 2012 IEEE International Conference on Robotics and Automation, ICRA 2012. Institute of Electrical and Electronics Engineers Inc., p. 3975-3982 8 p. 6224652. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Motion primitives for path following with a self-assembled robotic swimmer

Orduno, C., Becker, A. & Bretl, T., Dec 1 2012, 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2012. p. 1440-1446 7 p. 6385734. (IEEE International Conference on Intelligent Robots and Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Prediction of distal arm joint angles from EMG and shoulder orientation for prosthesis control

Akhtar, A., Hargrove, L. J. & Bretl, T. W., Dec 14 2012, 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2012. p. 4160-4163 4 p. 6346883. (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Proving path non-existence using sampling and alpha shapes

McCarthy, Z., Bretl, T. W. & Hutchinson, S. A., Jan 1 2012, 2012 IEEE International Conference on Robotics and Automation, ICRA 2012. Institute of Electrical and Electronics Engineers Inc., p. 2563-2569 7 p. 6225300. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Robust optimal deployment of mobile sensor networks

Hutchinson, S. & Bretl, T., Jan 1 2012, 2012 IEEE International Conference on Robotics and Automation, ICRA 2012. Institute of Electrical and Electronics Engineers Inc., p. 671-676 6 p. 6225200. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2011

A compact representation of locally-shortest paths and its application to a human-robot interface

Akce, A. & Bretl, T., Dec 1 2011, 2011 IEEE International Conference on Robotics and Automation, ICRA 2011. p. 2713-2718 6 p. 5980418. (Proceedings - IEEE International Conference on Robotics and Automation).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Actuation timing strategies for a portable powered ankle foot orthosis

Morris, E. A., Shorter, K. A., Li, Y., Hsiao-Wecksler, E. T., Kogler, G. F., Bretl, T. & Durfee, W. K., Dec 1 2011, ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control, DSCC 2011. p. 807-814 8 p. (ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control, DSCC 2011; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Maximum entropy inverse reinforcement learning in continuous state spaces with path integrals

Aghasadeghi, N. & Bretl, T. W., Dec 29 2011, IROS'11 - 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems: Celebrating 50 Years of Robotics. p. 1561-1566 6 p. 6048804. (IEEE International Conference on Intelligent Robots and Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Motion planning under bounded uncertainty using ensemble control

Becker, A. & Bretl, T. W., Jan 1 2011, Robotics: Science and Systems VI. Matsuoka, Y., Durrant-Whyte, H. & Neira, J. (eds.). MIT Press Journals, p. 299-306 8 p. (Robotics: Science and Systems; vol. 6).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Probably approximately correct coverage for robots with uncertainty

Das, C., Becker, A. & Bretl, T., Dec 29 2011, IROS'11 - 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems: Celebrating 50 Years of Robotics. p. 1160-1166 7 p. 6048323. (IEEE International Conference on Intelligent Robots and Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Simulation and experimental analysis of a portable powered ankle-foot orthosis control

Li, Y., Shorter, K. A., Hsiao-Wecksler, E. T. & Bretl, T., Dec 1 2011, ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control, DSCC 2011. p. 77-84 8 p. (ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control, DSCC 2011; vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2010

An optimal solution to the linear search problem for a robot with dynamics

De Pablo, I. R., Becker, A. & Bretl, T., Dec 1 2010, IEEE/RSJ 2010 International Conference on Intelligent Robots and Systems, IROS 2010 - Conference Proceedings. p. 652-657 6 p. 5653185. (IEEE/RSJ 2010 International Conference on Intelligent Robots and Systems, IROS 2010 - Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

A probabilistic language model for hand drawings

Akce, A. & Bretl, T., Nov 18 2010, Proceedings - 2010 20th International Conference on Pattern Recognition, ICPR 2010. p. 109-112 4 p. 5597640. (Proceedings - International Conference on Pattern Recognition).

Research output: Chapter in Book/Report/Conference proceedingConference contribution