Chung Chi Chang

US Patent:

6637002, Oct 21, 2003

Filed:

Oct 21, 1998

Appl. No.:

09/176658

Inventors:

Shih Mo - Milpitas CA
Chung Chang - San Jose CA

Assignee:

Maxtor Corporation - Longmont CO

International Classification:

H03M 1300

US Classification:

714781, 708507

Abstract:

A decoder for decoding block error correction codes is described. The decoder includes a first search circuit to find roots of an error location polynomial corresponding to an error location and a second search circuit to find roots of an error location polynomial corresponding to an error location. A multiplexer is fed by the first search circuit and the second search circuit to produce an error location from the error location polynomial.

US Patent:

6820095, Nov 16, 2004

Filed:

Apr 16, 2001

Appl. No.:

09/834658

Inventors:

Sofia Yeung - Union City CA
Chung Chang - San Jose CA

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 1730

US Classification:

707200, 707205, 711173

Abstract:

An object, such as a relational database table, is partitioned into a plurality of subsets. Selected subsets, e. g. partitions, of the object are exported into a dump file, identifying each exported subset of data by writing a marker in the dump file. Selected subsets are imported from the dump file, by determining whether the marker in the dump file corresponds to the selected subsets, then conditionally importing the data associated with the marker. Objects are repartitioned by exporting the some of the subsets, reconfiguring the object, and importing the exported subsets back into the object.

US Patent:

7020282, Mar 28, 2006

Filed:

Sep 5, 2000

Appl. No.:

09/655230

Inventors:

Chung Nan Chang - Los Altos CA, US

International Classification:

H04L 9/00
H04K 1/00

US Classification:

380 44, 380 28, 380 30, 380285, 713171

Abstract:

One aspect of the present invention establishes a session key by a receiving unit R transmitting a plurality of quantities for storage in a public repository. A sending unit S:Another aspect provides a digital signature. Before transmitting a signed message, the unit S stores a plurality of quantities in the public repository. A unit R, that receives the message and the digital signature, verifies their authenticity by:.

US Patent:

7327846, Feb 5, 2008

Filed:

Sep 5, 2000

Appl. No.:

09/655229

Inventors:

Chung Nan Chang - Los Altos CA, US

International Classification:

H04L 9/00
H04K 1/00

US Classification:

380285, 380277, 380282, 380259, 713171

Abstract:

One aspect of the present invention establishes a session key by a receiving unit R transmitting a plurality of quantities for storage in a public repository. A sending unit S:Another aspect provides a digital signature. Before transmitting a signed message, the unit S stores a plurality of quantities in the public-repository. A unit R, that receives the message and the digital signature, verifies their authenticity by:.

US Patent:

7578359, Aug 25, 2009

Filed:

Dec 22, 2006

Appl. No.:

11/615526

Inventors:

Richard Coates - Middlebury CT, US
Chung Chang - Lexington MA, US
Iain Cooper - Sugarland TX, US
Marcel Boucher - Houston TX, US

Assignee:

Schlumberger Technology Corporation - Cambridge MA

International Classification:

E21B 47/14

US Classification:

175 40, 175 50, 1661771, 181106, 181113

Abstract:

An acoustic source for delivering acoustic energy to a ground formation, particularly a rock formation, the source including (a) a solenoid to generate an electromagnetic field, (b) a bullet positioned within the influence of the electromagnetic field, (c) a casing surrounding and enclosing the solenoid and bullet so that both the solenoid and the bullet are protected from the surrounding environment, in use the solenoid being electrically energized to cause the bullet to be propelled by electromagnetic force so that the bullet impacts an anvil portion of the casing in contact with the ground formation is provided.

US Patent:

7604800, Oct 20, 2009

Filed:

May 10, 2005

Appl. No.:

11/125837

Inventors:

Rong-Hwa Lin - Taipei, TW
Chung Nan Chang - Foster City CA, US
Pei-Jiun Chen - Taipei, TW
Chiu-Chen Huang - Taipei, TW

Assignee:

AbGenomics Coöperatief U.A. - Amsterdam

International Classification:

A61K 39/395
C07K 16/28

US Classification:

4241541, 4241301, 4241331, 4241411, 4241431, 4241441, 4241521, 4241531, 4241721, 4241731, 5303871, 5303873, 5303881, 5303882, 53038822, 5303887, 53038873, 53038875

Abstract:

Immunoglobulin chains or antibodies having light or heavy chain complementarity determining regions of antibodies that bind to P-Selectin Glycoprotein Ligand-1. Also disclosed are methods of inducing death of an activated T-cell and of modulating a T cell-mediated immune response in a subject.

US Patent:

7617908, Nov 17, 2009

Filed:

Nov 13, 2006

Appl. No.:

11/559252

Inventors:

Chung Chang - Lexington MA, US
Richard Timothy Coates - Middlebury CT, US
Jean G. Saint Germain - Cambridge MA, US

Assignee:

Schlumberger Technology Corporation - Ridgefield CT

International Classification:

G01V 1/02

US Classification:

181121, 181106, 181108, 181113, 367 25, 166249, 1662542, 166209, 166210, 166211

Abstract:

Elastodynamic waves are generated by a tool having a hammer rotatably connected with a housing by a first hinge and an actuator arm rotatably connected with the hammer by a second hinge. An axial force applied to the actuator arm by a drive shaft and spring is translated and amplified to a radial impact force by rotation of the hammer around the first hinge. The tool may also include a stabilizer arm connected to the actuator arm by a third hinge, and connected to the housing by a fourth hinge. The housing may be an acoustic wireline tool cylinder having an opening that permits the hammer mass to extend outside the housing when rotated in a first direction. The housing may also include a second opening that permits the hammer mass to extend outside the housing when rotated in a second direction, and a third opening that permits the hammer mass to extend outside the housing when rotated between the first and second openings.

US Patent:

8009510, Aug 30, 2011

Filed:

Oct 23, 2008

Appl. No.:

12/256860

Inventors:

Chung Chang - Lexington MA, US

Assignee:

Schlumberger Technology Corporation - Cambridge MA

International Classification:

G01V 1/42
E21B 47/00

US Classification:

367 57, 367 25, 367 27, 175 40

Abstract:

Methods and related systems are described making seismic measurements. Seismic energy is transmitted into the earth using a surface seismic source. The seismic energy is received with one or more downhole receivers located in a borehole. In response to the received seismic energy from the surface seismic source, seismic energy is transmitted into the earth using a downhole seismic source. The seismic energy from the downhole seismic source is then received with one or more surface receivers located on the surface of the earth. A delay interval is measured downhole between the first arrival of the seismic energy from the surface seismic source and the transmission from the downhole seismic source. A surface interval is measured between the transmitting of seismic energy from the surface seismic source and first arrival of the seismic energy from the downhole seismic source using the one or more surface receivers. Travel time can be calculated by subtracting the delay interval from the surface interval.