Search results for: Tyson L. Hedrick

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article

Experimental evidence that physical activity inhibits osteoarthritis: Implications for inferring activity patterns from osteoarthritis in archeological human skeletons

Ian J. Wallace, Grant J. Riew, Rebecca Landau, Alison M. Bendele, more

American Journal of Physical Anthropology > 177 > 2 > 223 - 231

Objectives Osteoarthritis (OA) is a common joint disease whose causes are not fully understood, but a longstanding hypothesis is that OA stems primarily from the cumulative effects of joint mechanical loading throughout life. Based on this wear and tear hypothesis, anthropologists have assumed that the presence of OA in archeological human skeletons can be interpreted as evidence of a highly physically...

article

A nondestructive method to estimate the chlorophyll content of Arabidopsis seedlings

Ying Liang, Daisuke Urano, Kang-Ling Liao, Tyson L. Hedrick, more

Plant Methods > 2017 > 13 > 1 > 1-10

Background Chlorophyll content decreases in plants under stress conditions, therefore it is used commonly as an indicator of plant health. Arabidopsis thaliana offers a convenient and fast way to test physiological phenotypes of mutations and treatments. However, chlorophyll measurements with conventional solvent extraction are not applicable to Arabidopsis leaves due to their small size, especially...

article

Flight motor modulation with speed in the hawkmoth Manduca sexta

Tyson L. Hedrick, Jorge Martínez-Blat, Mariah J. Goodman

Journal of Insect Physiology > 2017 > 96 > C > 115-121

The theoretical underpinnings for flight, including animal flight with flapping wings, predict a curvilinear U-shaped or J-shaped relationship between flight speed and the power required to maintain that speed. Experimental data have confirmed this relationship for a variety of bird and bat species but not insects, possibly due to differences in aerodynamics and physiology or experimental difficulties...

chapter

Discovering useful parts for pose estimation in sparsely annotated datasets

Mikhail Breslav, Tyson L. Hedrick, Stan Sclaroff, Margrit Betke

2016 IEEE Winter Conference on Applications of Computer Vision (WACV) > 1 - 9

2016 IEEE Winter Conference on Applications of Computer Vision (WACV)

Our work introduces a novel way to increase pose estimation accuracy by discovering parts from unannotated regions of training images. Discovered parts are used to generate more accurate appearance likelihoods for traditional part-based models like Pictorial Structures [13] and its derivatives. Our experiments on images of a hawkmoth in flight show that our proposed approach significantly improves...

article

Performance of a quasi-steady model for hovering hummingbirds

Jialei Song, Haoxiang Luo, Tyson L. Hedrick

Theoretical and Applied Mechanics Letters > 2015 > 5 > 1 > 50-53

A quasi-steady model describing aerodynamics of hovering Ruby-throated hummingbirds is presented to study extent of the low-order model in representing the flow physics of the bird and also to separately quantify the forces from the translational, rotational, and acceleration effects. Realistic wing kinematics are adopted and the model is calibrated against computational fluid dynamics (CFD) simulations...

chapter

Collision avoidance in biological systems using collision cones

Beth L. Boardman, Tyson L. Hedrick, Diane H. Theriault, Nathan W. Fuller, more

2013 American Control Conference > 2964 - 2971

2013 American Control Conference (ACC)

The focus of the work in this paper is the comparison of a mathematical deconfliction algorithm to biological data in a range of species that demonstrate agile flight beyond the current capabilities of engineered systems. The algorithm was tailored to two coordinate systems, global and body relative, and two velocity changing criteria, constant and variable speed. Three species of animals were considered:...

chapter

Tracking a large number of objects from multiple views

Zheng Wu, Nickolay I. Hristov, Tyson L. Hedrick, Thomas H. Kunz, more

2009 IEEE 12th International Conference on Computer Vision > 1546 - 1553

2009 IEEE 12th International Conference on Computer Vision (ICCV)

We propose a multi-object multi-camera framework for tracking large numbers of tightly-spaced objects that rapidly move in three dimensions. We formulate the problem of finding correspondences across multiple views as a multidimensional assignment problem and use a greedy randomized adaptive search procedure to solve this NP-hard problem efficiently. To account for occlusions, we relax the one-to-one...

article

Effects of flight speed upon muscle activity and metabolic rate in hummingbirds

Bret W. Tobalske, Tyson L. Hedrick, Andrew A. Biewener, Douglas R. Warrick, more

Comparative Biochemistry and Physiology, Part A > 2009 > 153 > 2 Supplement > S122

article

Quantifying the complexity of bat wing kinematics

Daniel K. Riskin, David J. Willis, José Iriarte-Díaz, Tyson L. Hedrick, more

Journal of Theoretical Biology > 2008 > 254 > 3 > 604-615

Body motions (kinematics) of animals can be dimensionally complex, especially when flexible parts of the body interact with a surrounding fluid. In these systems, tracking motion completely can be difficult, and result in a large number of correlated measurements, with unclear contributions of each parameter to performance. Workers typically get around this by deciding a priori which variables are...

article

Biomechanical Acclimation: Flying Cold

Joel G. Kingsolver, Tyson L. Hedrick

Current Biology > 2008 > 18 > 18 > R876

Why are animals reared at colder temperatures larger? A new study shows that fruit flies reared at lower temperatures are better able to fly in the cold.

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Search results for: Tyson L. Hedrick

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