Daniel T Chang

US Patent:

6578046, Jun 10, 2003

Filed:

Jun 5, 2001

Appl. No.:

09/873220

Inventors:

Daniel T. Chang - San Jose CA
Siyi Terry Donn - Saratoga CA
Douglas Michael Hembry - Los Gatos CA
Tae Jae Lee - Cupertino CA
Basuki N. Soetarman - Los Gatos CA
Robert N. Summers - San Jose CA
Frank C. Tung - Saratoga CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1730

US Classification:

707103, 707100, 707 10, 707 4

Abstract:

A computer method and system capable of searching multiple heterogeneous datastores with heterogeneous data types by employing an object oriented data model to define a federated datastore object. The federated query object translates a generic query into the appropriate queries for each datastore, the federated datastore object acts as a virtual datastore for multiple heterogeneous datastores with the ability to map concepts between datastores, and the federated collection object represents results from a federated query in a hierarchy that maintains sub-grouping information from each datastore to allow accessing of results by datastore or as a single collection of results. The federated objects thus provide user applications with enhanced accessibility of different hierarchies of information, as well as more robust search capabilities.

US Patent:

6584459, Jun 24, 2003

Filed:

Jun 2, 1999

Appl. No.:

09/325661

Inventors:

Daniel T. Chang - San Jose CA
Josephine M. Cheng - San Jose CA
Jian Xu - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1730

US Classification:

707 3

Abstract:

An extender for a computer-implemented relational database system is disclosed for storing, querying, and retrieving structured documents. The extender provides a new abstract data type and includes a plurality of user defined functions for storing, querying, and retrieving structured documents internally, as character-based large objects (CLOB), or externally, in flat files or URLs, for example. A method and apparatus using an extender having a âconditional selectâ functionality is further disclosed for querying structured documents. The âconditional selectâ functionality is based on user defined functions residing within the extender being applied to a projection in a structured query in the database system. A method and apparatus using an extender having a set of user defined functions is further disclosed for creating one or more indexes for structured documents stored in the relational database system. The method uses the set of functions to create the indexes and uses already created B+ tree index structures implemented in the database system to support the indexes.

US Patent:

6661276, Dec 9, 2003

Filed:

Jul 29, 2002

Appl. No.:

10/209211

Inventors:

Daniel Chang - Fremont CA

Assignee:

Lovoltech Inc. - Santa Clara CA

International Classification:

H03K 17687

US Classification:

327427, 327430

Abstract:

A matching circuit for coupling a conventional metal-oxide semiconductor field effect transistor (MOSFET) driver to the gate of a junction field effect transistor (JFET). A driver circuit optimized for driving a MOSFET is combined with a matching circuit to provide gate drive for a JFET. The matching circuit comprises a resistor and capacitor in parallel. For driving enhancement mode JFETs having a gate grid array structure and a pinch-off voltage greater than 0. 4 volts, the range of resistor values is 10 to 200 ohms, and the range of capacitor values is 1 to 100 nF. For devices having a pinch-off voltage less than 0. 4 volts, the range of resistor values is 100 to 2000 ohms. The matching circuit may further include a diode to provide a bias.

US Patent:

6769014, Jul 27, 2004

Filed:

Jul 1, 1998

Appl. No.:

09/108854

Inventors:

Daniel T. Chang - San Jose CA
Neelakantan Sundaresan - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1516

US Classification:

709206, 707 10, 707103

Abstract:

A Mail Facility Layer providing a general, semantics-free mail paradigm for asynchronous communication between distributed objects. It provides a level of abstraction in terms of mail, virtual mailbox, post office, and mail queue. It hides the details of implementation and transport and provides location transparency. A mail is asynchronously communicated between distributed objects by associating a destination with a name, wherein the destination is located on a remote system; associating the name with a first virtual mailbox representing the destination, wherein the first virtual mailbox is located on a local system; creating the mail; opening the first virtual mailbox; putting the mail in the first virtual mailbox; sending the mail from the first virtual mailbox to a second virtual mailbox, wherein the second virtual mailbox is located on the remote system; opening the second virtual mailbox; and getting the mail from the second virtual mailbox.

US Patent:

7417266, Aug 26, 2008

Filed:

Jun 10, 2005

Appl. No.:

11/149718

Inventors:

Jian Li - Sunnyvale CA, US
Daniel Chang - Fremont CA, US
Ho-Yuan Yu - Saratoga CA, US

Assignee:

QSpeed Semiconductor Inc. - Santa Clara CA

International Classification:

H01L 27/088

US Classification:

257135, 257272, 257329, 257330, 257E2926, 257E29265

Abstract:

A field effect transistor, in accordance with one embodiment, includes a metal-oxide-semiconductor field effect transistor (MOSFET) having a junction field effect transistor (JFET) embedded as a body diode.

US Patent:

7433940, Oct 7, 2008

Filed:

Jan 21, 2004

Appl. No.:

10/763013

Inventors:

Bruce A. Benfield - Austin TX, US
Daniel T. Chang - San Jose CA, US
Mary C. Lehner - San Jose CA, US
Sundararaman Saiprasad - San Jose CA, US
Robbert C. Van der Linden - Scotts Valley CA, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/177

US Classification:

709221, 709223, 709226, 709245

Abstract:

Disclosed is a method, system, and program for managing schemas. A schema and one or more associated schema documents are registered. A schema information document is automatically generated based on the schema and the one or more associated schema documents. A request to be performed on at least one of the schema, an associated schema document, and the schema information document is processed.

US Patent:

7590681, Sep 15, 2009

Filed:

Aug 7, 2000

Appl. No.:

09/632897

Inventors:

Daniel T. Chang - Belmont CA, US
Jay Raju - Fremont CA, US
Rodric C. Fan - Fremont CA, US
Haiqi Chen - Sunnyvale CA, US
Paul Chen - San Jose CA, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

G06F 15/16

US Classification:

709203, 709206, 709214, 709228

Abstract:

A method and a system allow presentation of web pages to an internet appliance (e. g. , a hand-held computer, a mobile telephone, or a digital personal assistant) according to user preferences. The user preferences are captured by a management server, which provides a web page customization service in conjunction with a document manager, which parses the web pages to identify information units. The customized web pages are stored in a database using a standardized hypertext document representation device, such as XML. The customized web pages are accessible from a portal adapted for accessing by the internet appliance. In one implementation, the user is also offered pre-configured resources for frequently used services when accessing the portal using the internet device.

US Patent:

7921191, Apr 5, 2011

Filed:

Aug 21, 2008

Appl. No.:

12/196213

Inventors:

Bruce A. Benfield - Austin TX, US
Daniel T. Chang - San Jose CA, US
Mary C. Lehner - San Jose CA, US
Sundararaman Saiprasad - San Jose CA, US
Robbert C. Van der Linden - Scotts Valley CA, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/177

US Classification:

709221, 709223, 709226, 709245

Abstract:

Disclosed is a system and program for managing schemas. A schema and one or more associated schema documents are registered. A schema information document is automatically generated based on the schema and the one or more associated schema documents. A request to be performed on at least one of the schema, an associated schema document, and the schema information document is processed.