Benito Fernandez

US Patent:

7454450, Nov 18, 2008

Filed:

Dec 12, 2007

Appl. No.:

11/955006

Inventors:

Brian Remy - Houston TX, US
Michael D. Bryant - Austin TX, US
Benito R. Fernandez - Austin TX, US
Shouli Yan - Austin TX, US

Assignee:

The Board of regents, The University of Texas System - Austin TX

International Classification:

G06F 7/52
G06F 15/00

US Classification:

708103, 708200

Abstract:

A mixed-signal system for performing Taylor series function approximations is disclosed. The mixed-signal system includes a digital-to-analog converter (DAC), multiple resistor-to-resistor (R2R) ladders, various digital registers, a digital processor and an analog integrator. The digital processor calculates coefficients F, F, F, F, F, Fof a Taylor series equation and calculates distance functions. The digital processor also includes a digital register for storing a magnitude scaling factor φ(x,y) of the Taylor series equation. The DAC control register uploads a lead term F(x,y) of the Taylor series equation from the digital processor to the DAC. The first-order digital registers controls resistances of the R2R ladders. The second-order digital registers uploads coefficients F, F, F, F, Fof the Taylor series equation from the digital processor to the DAC. The analog integrator adds outputs from the DAC and the R2R ladder to generate approximation results for the Taylor series equation.

US Patent:

7555507, Jun 30, 2009

Filed:

Dec 16, 2005

Appl. No.:

11/303172

Inventors:

Michael Bryant - Austin TX, US
Ashish Seth - Mumbai, IN
Benito Fernandez - Austin TX, US

Assignee:

Board of Regents, The University of Texas System - Austin TX

International Classification:

G06J 1/00
G06G 7/18

US Classification:

708 6, 708822

Abstract:

An apparatus for solving time-continuous differential equations is disclosed. The apparatus includes a group of hybrid integrators interconnected to each other. Each one of the hybrid integrators includes an analog integrator, a conversion logic and multiple digital registers. The analog integrator generates an analog output, and the conversion logic along with the digital registers converts the analog output to a digital output. The analog output and the digital output are then combined to yield an integrated output. The integrated output is fed to the hybrid integrators within the group.

US Patent:

7796075, Sep 14, 2010

Filed:

Apr 30, 2007

Appl. No.:

11/742465

Inventors:

Benito R. Fernandez - Austin TX, US
Zhaohong Wu - Katy TX, US

International Classification:

H03M 1/78

US Classification:

341154, 341120

Abstract:

A method to tune electronic devices in general using R/2R ladder networks to obtain fixed or variable accurate properties that may include, but are not limited to resistance, current, voltage, and/or timing. As a particular application, a method for internally calibrating a digital-to-analog converter is shown in detail. The DAC uses an extended R/2R ladder to improve the converting accuracy by mapping the extended bits into the original bits. A mapping matrix is maintained, which can be rewritten by an internal calibration process.

US Patent:

54795710, Dec 26, 1995

Filed:

Apr 13, 1993

Appl. No.:

8/046936

Inventors:

Alexander G. Parlos - College Station TX
Amir F. Atiya - College Station TX
Benito Fernandez - Austin TX
Wei K. Tsai - Irvine CA
Kil T. Chong - College Station TX

Assignee:

The Texas A&M University System - College Station TX

International Classification:

G06F 1518

US Classification:

395 21

Abstract:

The present invention is a fully connected feed forward network that includes at least one hidden layer 16. The hidden layer 16 includes nodes 20 in which the output of the node is fed back to that node as an input with a unit delay produced by a delay device 24 occurring in the feedback path 22 (local feedback). Each node within each layer also receives a delayed output (crosstalk) produced by a delay unit 36 from all the other nodes within the same layer 16. The node performs a transfer function operation based on the inputs from the previous layer and the delayed outputs. The network can be implemented as analog or digital or within a general purpose processor. Two teaching methods can be used: (1) back propagation of weight calculation that includes the local feedback and the crosstalk or (2) more preferably a feed forward gradient decent which immediately follows the output computations and which also includes the local feedback and the crosstalk. Subsequent to the gradient propagation, the weights can be normalized, thereby preventing convergence to a local optimum. Education of the network can be incremental both on and off-line.

US Patent:

20230023664, Jan 26, 2023

Filed:

Sep 27, 2022

Appl. No.:

17/954280

Inventors:

- Austin TX, US
Benito R. Fernandez - Austin TX, US

International Classification:

H04L 9/40

Abstract:

A system and a method of determining persistent presence of an authorized user while performing allowed operations on an allowed resource of the system while satisfying certain context-sensitive restrictions are disclosed. The system receives a request from a user to authenticate him/her. The system authenticates the user using biometric information of the user or any other authentication mechanism in a given context-sensitive restriction. If the user is authenticated, then the system allows the user to perform the allowed operation using the allowed resources in the context-sensitive restriction. If the authentication fails indicating that the user is an unauthorized user, then the system initiates a resolution process to halt or terminate the allowed operation to restrict or obfuscate the allowed operation from being accessed by the unauthorized user. In one embodiment, the system comprises an External Companion Device (ECD) paired with the system to perform the authentication and manage the allowed.

US Patent:

20210281572, Sep 9, 2021

Filed:

Mar 4, 2021

Appl. No.:

17/192866

Inventors:

- Austin TX, US
Benito R. Fernandez - Austin TX, US

International Classification:

H04L 29/06

Abstract:

A system and a method of determining persistent presence of an authorized user while performing allowed operations on an allowed resource of the system while satisfying certain context-sensitive restrictions are disclosed. The system receives a request from a user to authenticate him/her. The system authenticates the user using biometric information of the user or any other authentication mechanism in a given context-sensitive restriction. If the user is authenticated, then the system allows the user to perform the allowed operation using the allowed resources in the context-sensitive restriction. If the authentication fails indicating that the user is an unauthorized user, then the system initiates a resolution process to halt or terminate the allowed operation to restrict or obfuscate the allowed operation from being accessed by the unauthorized user. In one embodiment, the system comprises an External Companion Device (ECD) paired with the system to perform the authentication and manage the allowed.