Patents by Inventor Y. C. Chang

Y. C. Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10666441
    Abstract: Exposure of sensitive information to users and other servers is controlled by using a first security token which contains a user identity and one or more user credentials associated with a first user; a second security token which contains an identity of a token issuer and an identity of a first owning process; and at least a first trusted server which accesses a downstream computing service on behalf of the first user by substituting or combining the first security token and the second security token, while preventing the second security token from being exposed to the first user. This establishes a first security sensitivity level for the first user and a second security sensitivity level for the first trusted server, wherein the first security sensitivity level is a lower access level than the second security sensitivity level for the downstream service.
    Type: Grant
    Filed: April 1, 2019
    Date of Patent: May 26, 2020
    Assignee: International Business Machines Corporation
    Inventors: John Y-C. Chang, Ching-Yun Chao, Bertrand Be-Chung Chiu, Ki H. Park
  • Publication number: 20190229917
    Abstract: Exposure of sensitive information to users and other servers is controlled by using a first security token which contains a user identity and one or more user credentials associated with a first user; a second security token which contains an identity of a token issuer and an identity of a first owning process; and at least a first trusted server which accesses a downstream computing service on behalf of the first user by substituting or combining the first security token and the second security token, while preventing the second security token from being exposed to the first user. This establishes a first security sensitivity level for the first user and a second security sensitivity level for the first trusted server, wherein the first security sensitivity level is a lower access level than the second security sensitivity level for the downstream service.
    Type: Application
    Filed: April 1, 2019
    Publication date: July 25, 2019
    Inventors: John Y-C. Chang, Ching-Yun Chao, Bertrand Be-Chung Chiu, Ki H. Park
  • Patent number: 10341109
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: July 2, 2019
    Assignee: International Business Machines Corporation
    Inventors: John Y-C. Chang, Ching-Yun Chao, Bertrand Be-Chung Chiu, Ki H. Park
  • Publication number: 20170279610
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Application
    Filed: June 12, 2017
    Publication date: September 28, 2017
    Inventors: John Y-C. Chang, Ching-Yun Chao, Bertrand Be-Chung Chiu, Ki H. Park
  • Patent number: 9712322
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: July 18, 2017
    Assignee: International Business Machines Corporation
    Inventors: John Y-C. Chang, Ching-Yun Chao, Bertrand Be-Chung Chiu, Ki H. Park
  • Publication number: 20170026179
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Application
    Filed: October 5, 2016
    Publication date: January 26, 2017
    Inventors: John Y-C. Chang, Ching-Yun Chao, Bertrand Be-Chung Chiu, Ki H. Park
  • Patent number: 9531538
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: December 27, 2016
    Assignee: International Business Machines Corporation
    Inventors: John Y-C. Chang, Ching-Yun CHao, Bertrand Be-Chung Chiu, Ki Hong Park
  • Patent number: 9501528
    Abstract: Once a request is received from a common information model (CIM) Object Manager (CIMOM), a CIM server may respond quickly and efficiently by utilizing data which is stored in advance of the request from the CIMOM. This previously stored copy of soon-to-be-requested data may be stored in anticipation of receiving the request from the CIMOM for the data, and may be quickly returned to the CIMOM upon receiving the request for it. A CIM profile provider may generate this pre-stored data for a device in order to respond to the request, and a CIM caching provider may receive the data, store the data, receive the request for the data, and provide the data in response to the request, according to one embodiment.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: November 22, 2016
    Assignee: International Business Machines Corporation
    Inventors: Hancock Y C Chang, Chang Wei-Chien, Ku-Lan Kao, Ku Chang Kuo
  • Publication number: 20160099808
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Application
    Filed: December 11, 2015
    Publication date: April 7, 2016
    Inventors: John Y-C. Chang, Ching-Yun Chao, Bertrand Be-Chung Chiu, Ki Hong Park
  • Patent number: 9237020
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Grant
    Filed: September 13, 2014
    Date of Patent: January 12, 2016
    Assignee: International Business Machines Corporation
    Inventors: John Y-C. Chang, Ching-Yun CHao, Bertrand Be-Chung Chiu, Ki Hong Park
  • Patent number: 9148285
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Grant
    Filed: January 21, 2013
    Date of Patent: September 29, 2015
    Assignee: International Business Machines Corporation
    Inventors: John Y-C. Chang, Ching-Yun Chao, Bertrand Be-Chung Chiu, Ki Hong Park
  • Publication number: 20150006902
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Application
    Filed: September 13, 2014
    Publication date: January 1, 2015
    Inventors: John Y-C. Chang, Ching-Yun CHao, Bertrand Be-Chung Chiu, Ki Hong Park
  • Publication number: 20140208119
    Abstract: Exposure of sensitive information to users is controlled using a first security token containing user identity and user credentials to represent the user who requests services, and a second security token containing two other identities, one identifying the token issuer and the other identifying the owning process. When requesting services, the token-owning process sends a security token to indicate who is making the request, and uses its key to digitally sign the request. The token-owning process signs the request to indicate that it endorses the request.
    Type: Application
    Filed: January 21, 2013
    Publication date: July 24, 2014
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: John Y-C. Chang, Ching-Yun CHao, Bertrand Be-Chung Chiu, Ki Hong Park
  • Patent number: 8432180
    Abstract: A system or apparatus for monitoring an Integrated Circuit (IC) chip includes: a sense circuit at least partially constructed on the IC chip and configured to produce one or more sense signals each indicative of a corresponding process-dependent circuit parameter of the IC chip; and a digitizer module configured to produce, responsive to the one or more sense signals, one or more digitized signals each representative of a corresponding one of the sense signals. A controller is configured to determine a value of one or more of the process-dependent circuit parameters based on one or more of the digitized signals.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: April 30, 2013
    Assignee: Broadcom Corporation
    Inventors: Lawrence M. Burns, Leonard Dauphinee, Ramon A. Gomez, James Y. C. Chang
  • Patent number: 8227892
    Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programmable attenuation and a programmable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors with shields to increase circuit Q. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: July 24, 2012
    Assignee: Broadcom Corporation
    Inventor: James Y. C. Chang
  • Patent number: 8045066
    Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programmable attenuation and a programmable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: October 25, 2011
    Assignee: Broadcom Corporation
    Inventors: Pieter Vorenkamp, Klaas Bult, Frank Carr, Christopher M. Ward, Ralph Duncan, Tom W. Kwan, James Y. C. Chang, Haideh Khorramabadi
  • Patent number: 7843205
    Abstract: A system or apparatus for monitoring an Integrated Circuit (IC) chip includes: a sense circuit at least partially constructed on the IC chip and configured to produce one or more sense signals each indicative of a corresponding process-dependent circuit parameter of the IC chip; and a digitizer module configured to produce, responsive to the one or more sense signals, one or more digitized signals each representative of a corresponding one of the sense signals. A controller is configured to determine a value of one or more of the process-dependent circuit parameters based on one or more of the digitized signals.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: November 30, 2010
    Assignee: Broadcom Corporation
    Inventors: Lawrence M. Burns, Leonard Dauphinee, Ramon A. Gomez, James Y. C. Chang
  • Patent number: 7821581
    Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programmable attenuation and a programmable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.
    Type: Grant
    Filed: July 30, 2008
    Date of Patent: October 26, 2010
    Assignee: Broadcom Corporation
    Inventors: Pieter Vorenkamp, Klaas Bult, Frank Carr, Christopher M. Ward, Ralph Duncan, Tom W. Kwan, James Y. C. Chang, Haideh Khorramabadi
  • Patent number: 7821280
    Abstract: A method and system for monitoring and compensating the performance of an operational circuit is provided. The system includes one or more integrated circuit chips and a controller. Each integrated circuit chip includes one or more operational circuits, each operational circuit having at least one controllable circuit parameter. Each integrated circuit chip also includes a process monitor module at least partially constructed thereon. The controller is coupled to each process monitor module and to each operational circuit. The controller includes logic for evaluating the performance of an operational circuit based on data obtained from process monitor module and operational circuit related data stored in a memory. Based on the evaluation, the controller determines whether any deviations from desired or optimal performance of the circuit exist. If deviations exist, the controller generates a control signal to initiate adjustments to the operational circuit to compensate for the deviations.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: October 26, 2010
    Assignee: Broadcom Corporation
    Inventors: Lawrence M. Burns, Leonard Dauphinee, Ramon A. Gomez, James Y. C. Chang
  • Patent number: 7783275
    Abstract: A direct conversion satellite tuner is fully integrated on a common substrate. The integrated tuner receives an RF signal having a plurality of channels and down-converts a selected channel directly to baseband for further processing. The integrated tuner includes on-chip local oscillator generation, tunable baseband filters, and DC Offset cancellation. The integrated tuner can be implemented in a completely differential I/Q configuration for improved electrical performance. The entire direct conversion satellite tuner can be fabricated on a single semiconductor substrate using standard CMOS processing, with minimal off-chip components. The tuner configuration described herein is not limited to processing TV signals, and can be utilized to down-convert other RF signals to an IF frequency or baseband.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: August 24, 2010
    Assignee: Broadcom Corporation
    Inventors: Myles Wakayama, Dana Vincent Laub, Frank Carr, Afshin Mellati, David S. P. Ho, Hsiang-Bin Lee, Chun-Ying Chen, James Y. C. Chang, Lawrence M. Burns, Young Joon Shin, Patrick Pai, Iconomos A. Koullias, Ron Lipka, Luke Thomas Steigerwald, Alexandre Kral