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Your search keyword '"Altendorfer, R."' showing total 15 results
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15 results on '"Altendorfer, R."'

1. Dual Supersymmetry Algebras from Partial Supersymmetry Breaking

Author

Altendorfer, R. and Bagger, J.

Subjects
High Energy Physics - Theory
Abstract

The partial breaking of supersymmetry in flat space can be accomplished using any one of three dual representations for the massive N=1 spin-3/2 multiplet. Each of the representations can be ``unHiggsed'', which gives rise to a set of dual N=2 supergravities and supersymmetry algebras., Comment: 12 pages, 1 figure, cosmetic changes

Published
1999
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2. Implications of Non-universal Soft Masses on Gauge Coupling Unification

Author

Altendorfer, R. and Kobayashi, T.

Subjects
High Energy Physics - Phenomenology
Abstract

We study the gauge coupling unification of the minimal supersymmetric standard model with non-universal soft scalar and gaugino masses. The unification scale of the gauge couplings is estimated for non-universal cases. It is sensitive to the non-universality. It turns out that these cases can be combined with the assumption of string unification, which leads to a prediction of $\sin^2 \theta_W(M_Z)$ and $k_1$, the normalisation of the $U(1)_Y$ generator. String unification predicts $k_1=1.3 - 1.4$. These values have non-trivial implications on string model building. Two-loop corrections are also calculated. Some of these cases exhibit a large discrepancy between experiment and string unification. We calculate string threshold corrections to explain the discrepancy., Comment: 25 pages, Latex, 4 figures (not included)

Published
1995
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5. RHex: A Biologically Inspired Hexapod Runner

Author

Artificial Intelligence Laboratory, University of Michigan, Ann Arbor, MI, 48109, USA, Ambulatory Robotics Laboratory, Department of Mechanical Engineering, McGill University, Montr??al, Qu??bec, Canada, H2A 2A7, The Robotics Institute, Carnegie Mellon University, Pittsburgh, PA, 15213, USA, Department of Integrative Biology, University of California at Berkeley, Berkeley, CA, 94720, USA, Ann Arbor, Altendorfer, R., Moore, N., Komsuoglu, H., Buehler, M., Brown, H.B., McMordie, D., Saranli, U., Full, R., Koditschek, D.E., Artificial Intelligence Laboratory, University of Michigan, Ann Arbor, MI, 48109, USA, Ambulatory Robotics Laboratory, Department of Mechanical Engineering, McGill University, Montr??al, Qu??bec, Canada, H2A 2A7, The Robotics Institute, Carnegie Mellon University, Pittsburgh, PA, 15213, USA, Department of Integrative Biology, University of California at Berkeley, Berkeley, CA, 94720, USA, Ann Arbor, Altendorfer, R., Moore, N., Komsuoglu, H., Buehler, M., Brown, H.B., McMordie, D., Saranli, U., Full, R., and Koditschek, D.E.

Abstract

RHex is an untethered, compliant leg hexapod robot that travels at better than one body length per second over terrain few other robots can negotiate at all. Inspired by biomechanics insights into arthropod locomotion, RHex uses a clock excited alternating tripod gait to walk and run in a highly maneuverable and robust manner. We present empirical data establishing that RHex exhibits a dynamical (???bouncing???) gait???its mass center moves in a manner well approximated by trajectories from a Spring Loaded Inverted Pendulum (SLIP)???characteristic of a large and diverse group of running animals, when its central clock, body mass, and leg stiffnesses are appropriately tuned. The SLIP template can function as a useful control guide in developing more complex autonomous locomotion behaviors such as registration via visual servoing, local exploration via visual odometry, obstacle avoidance, and, eventually, global mapping and localization.

Published
2006

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