Youssef M Hashash

8070679, Dec 6, 2011

Jul 21, 2008

12/176848

Jamshid Ghaboussi - Urbana IL, US
David A. Pecknold - Champaign IL, US
Youssef Hashash - Urbana IL, US
Tae-Hyun Kwon - Urbana IL, US

The Board of Trustees of the University of Illinois - Urbana IL

A61B 3/16

600399

A computer-implemented method for accurate determination of intraocular pressure (IOP) and characterization of mechanical properties of a cornea is provided that includes measuring a cornea with a probe tonometer to produce at least force versus displacement data over a range of applied forces; and forming a model of corneal constitutive parameters, with a computer having a processor, based on the data obtained by the probe tonometer to more accurately determine IOP and characterize mechanical properties of the cornea, wherein the computer is coupled with the probe tonometer.

20030195725, Oct 16, 2003

Apr 16, 2002

10/123357

Youssef Hashash - Urbana IL, US

The Board of Trustees of the University of Illinois

G06F007/60
G06F017/10

703/002000

An embodiment of a method and a program product of the invention has steps of selecting a model from a plurality of models in a model library, with at least one of the models being a constitutive model. Load data and load path data are input to the model to generate model output. The output is then displayed in a graphical format.

20030216894, Nov 20, 2003

Apr 9, 2003

10/409882

Jamshid Ghaboussi - Urbana IL, US
Youssef Hashash - Urbana IL, US
David Pecknold - Urbana IL, US

The Board of Trustees of the University

G06F017/10

703/002000

A method for modeling material behavior includes using empirical three dimensional non-uniform stress and strain data to train a self-organizing computational model such as a neural network. A laboratory device for measuring non-uniform stress and strain data from material includes an enclosure with an inclusion in it. As the enclosure is compressed, the inclusion induces a non-uniform state of stress and strain. A field testing device includes a body having a moveable section. When the body is inserted in a material and the moveable section moved, a non-uniform state of stress and strain can be characterized.

20030216895, Nov 20, 2003

Apr 9, 2003

10/409963

Jamshid Ghaboussi - Urbana IL, US
Youssef Hashash - Urbana IL, US

The Board of trustees of the University

G06F017/10

703/002000

A method for modeling the interaction of granular material with equipment includes the steps of numerically representing the material with an array having a plurality of cells, determining which of the cells may be unstable using a self-organizing computational model, and modeling the motion of the unstable cells using the model. Preferably, output is provided in virtual reality format in real time.

20090112489, Apr 30, 2009

Oct 14, 2008

12/250936

Jamshid Ghaboussi - Urbana IL, US
Youssef M.A. Hashash - Urbana IL, US
David Pecknold - Urbana IL, US

The Board of Trustees of the University of Illinois - Urbana IL

G01N 3/08
G01L 1/00
G01N 19/02

702 42, 73 9, 73818

A method for modeling material behavior includes using empirical three dimensional non-uniform stress and strain data to train a self-organizing computational model such as a neural network. A laboratory device for measuring non-uniform stress and strain data from material includes an enclosure with an inclusion in it. As the enclosure is compressed, the inclusion induces a non-uniform state of stress and strain. A field testing device includes a body having a moveable section. When the body is inserted in a material and the moveable section moved, a non-uniform state of stress and strain can be characterized.