Seong P Lee

US Patent:

7505882, Mar 17, 2009

Filed:

Mar 15, 2006

Appl. No.:

11/377760

Inventors:

Patrick Jenny - Zurich, CH
Hamdi A. Tchelepi - San Mateo CA, US
Seong H. Lee - Emeryville CA, US

Assignee:

Chevron U.S.A. Inc. - San Ramon CA

International Classification:

G06F 17/10
G06G 7/48

US Classification:

703 2, 703 10, 702 12

Abstract:

An apparatus and method are provided for solving a non-linear S-shaped function F=ƒ(S) which is representative of a property S in a physical system, such saturation in a reservoir simulation. A Newton iteration (T) is performed on the function ƒ(S) at Sto determine a next iterative value S. It is then determined whether Sis located on the opposite side of the inflection point Sfrom S. If Sis located on the opposite side of the inflection point from S, then Sis set to S, a modified new estimate. The modified new estimate, S, is preferably set to either the inflection point, S, or to an average value between Sand S, i. e. , S=0. 5(S+S). The above steps are repeated until Sis within the predetermined convergence criteria. Also, solution algorithms are described for two-phase and three-phase flow with gravity and capillary pressure.

US Patent:

7565278, Jul 21, 2009

Filed:

Dec 4, 2006

Appl. No.:

11/566609

Inventors:

Liyong Li - Livermore CA, US
Seong H. Lee - Emeryville CA, US
Clair Jensen - Oakland CA, US

Assignee:

Chevron U.S.A. Inc. - San Ramon CA

International Classification:

G06F 7/60
G06F 17/10
G06G 7/58

US Classification:

703 10, 703 2

Abstract:

A three-dimensional hybrid reservoir model representative of a fractured subterranean reservoir is created for simulating fluid flow. The model includes porous matrix blocks and a network of long fractures, which include two-dimensional fracture blocks, that ideally overly and are fluidly connected to the matrix blocks. To simulate fluid flow, matrix and fracture flow equations are obtained and effective fluid flow transmissibilities are determined. The matrix and fracture flow equations are then coupled via the effective fluid flow transmissibilities, such that they can be solved simultaneously for flow responses. The long fractures can be in direct fluid communication with one or more intersecting wells or other fractures. These intersections can be modeled as a point source to enhance numerical stability during simulation. The fracture characteristics, such as orientation, fracture aperture, fracture length, and fracture height, are more realistically modeled using this approach compared to previously known reservoir models.

US Patent:

20130322196, Dec 5, 2013

Filed:

May 31, 2012

Appl. No.:

13/484541

Inventors:

Seong Hoon LEE - San Jose CA, US

International Classification:

G11C 7/06
H03K 17/687

US Classification:

365207, 327108

Abstract:

A signal driving device includes a constant current circuit configured to provide a constant current, a first mirror circuit configured to generate a mirror current from the constant current and provide a voltage according to the mirror current of the constant current, a circuit comprising a switch device and configured to provide a driver current, a second mirror circuit configured to generate a mirror current of the driver current and output a voltage that includes a voltage drop caused when the mirror current of the driver current flows through a replica switch device, and a differential amplifier configured to receive the voltage from the first mirror circuit and the voltage from the second mirror circuit to provide a biased voltage for the bias circuit and thereby induce the driver current.

US Patent:

20200389254, Dec 10, 2020

Filed:

May 11, 2020

Appl. No.:

16/871864

Inventors:

- Cupertino CA, US
Seong Hoon Lee - San Jose CA, US
Huy M. Nguyen - San Jose CA, US

International Classification:

H04L 1/06
H03K 19/00

Abstract:

An apparatus includes first and second receiver circuits and a decision circuit. The first receiver circuit is configured to generate a first data symbol from a particular input data symbol of a plurality of input data symbols included in an input signal. The second receiver circuit is configured to generate a second data symbol from the particular input data symbol. The decision circuit is configured to select, using respective values of one or more previous output data symbols, either the first or second data symbol as a current output data symbol. In response to a change in value between successive input data symbols, the first and second receiver circuits are configured to generate the first and second data symbols with respective data valid windows with different durations.

US Patent:

20190369892, Dec 5, 2019

Filed:

May 29, 2019

Appl. No.:

16/425913

Inventors:

- San Jose CA, US
Seong No Lee - Cupertino CA, US

Assignee:

CNEX Labs, Inc. - San Jose CA

International Classification:

G06F 3/06
G06F 12/06

Abstract:

A method for processing a trim command via an input and output (“I/O”) command of a solid-state drive (“SSD”) using various tables is disclosed. The process is able to retrieve a trim node state table (“TNST”) from a local memory in response to the trim command. Upon identifying current node status of the TNST associated with a logical block address (“LBA”) referenced by the trim command, a trim operation is processed to a node if the current node status indicates a pending state. After changing the node status to a dirty state when the current node status is in a clean state, the content of a trim invalid bitmap table (“TIBT”) is updated to indicate the status of LBAs when the current node status is in a dirty state.

US Patent:

20190326896, Oct 24, 2019

Filed:

Apr 29, 2019

Appl. No.:

16/397966

Inventors:

- Cupertino CA, US
Seong Hoon Lee - San Jose CA, US

International Classification:

H03K 7/08
H03F 3/45
G06F 17/50

Abstract:

A method and apparatus for receiving reduced voltage swing signals is disclosed. A first amplifier may generate a first intermediate signal based on a difference between voltage levels of a first and second input signals, and a second amplifier may generate a second intermediate signal based on a difference in the voltage levels between the second and first input signals. A regenerative amplifier may increase a difference in the voltage level of the first and second intermediate signals using regenerative feedback and the voltage levels of the first and second input signals. A latch circuit may generate first and second output signals using the first and second intermediate signals.

US Patent:

20190066777, Feb 28, 2019

Filed:

Aug 23, 2017

Appl. No.:

15/684594

Inventors:

- Cupertino CA, US
Seong Hoon Lee - San Jose CA, US

International Classification:

G11C 13/00
H03K 3/012

Abstract:

Systems, apparatuses, and methods for generating a reference voltage are described. In various embodiments, an interface between a memory and a processor uses a reference voltage generator to generate a reference voltage for a single pin or a small group of pins. The generator generates a default reference voltage from a first tap in a resistor ladder, injects current with a current controller into a second tap of the resistor ladder when the generator receives an indication to generate a larger reference voltage, and draws current from a third tap of the resistor ladder when the generator receives an indication to generate a smaller reference voltage. The generator also generates a high threshold voltage independent of a low threshold voltage after calibration.