Patents by Inventor Stephen A. Weis
Stephen A. Weis 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).
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Publication number: 20150067265Abstract: A system and method of operation exploit the limited associativity of a single cache set to force observable cache evictions and discover conflicts. Loads are issued to input memory addresses, one at a time, until a cache eviction is detected. After observing a cache eviction on a load from an address, that address is added to a data structure representing the current conflict set. The cache is then flushed, and loads are issued to all addresses in the current conflict set, so that all known conflicting addresses are accessed first, ensuring that the next cache miss will occur on a different conflicting address. The process is repeated, issuing loads from all input memory addresses, incrementally finding conflicting addresses, one by one. Memory addresses that conflict in the cache belong to the same partition, whereas memory addresses belonging to different partitions do not conflict.Type: ApplicationFiled: September 5, 2014Publication date: March 5, 2015Applicant: PRIVATECORE, INC.Inventors: Carl A. WALDSPURGER, Oded HOROVITZ, Stephen A. WEIS, Sahil RIHAN
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Patent number: 8930001Abstract: A method of model identification for a process with unknown initial conditions in an industrial plant, the method comprising collecting a set of manipulated variables and corresponding set of process variables from the process; obtaining a plurality of manipulated variables from the collected set of manipulated variables; for each of the plurality of manipulated variables, obtaining optimal model parameters of a model transfer function and computing a model fitting index for optimized simulated process variables generated by the model transfer function using the optimal model parameters; identifying a best model fitting index among the model fitting indices computed; selecting a manipulated variable associated with the best model fitting index as an initial steady state condition for the model transfer function; and selecting the optimal model parameters corresponding with the best model fitting index as the best model parameters of the model transfer function to tune the controller.Type: GrantFiled: September 19, 2011Date of Patent: January 6, 2015Assignee: Yokogawa Electric CorporationInventors: Shengjing Mu, Stephen Wei Hong Weng, Joseph Ching Hua Lee
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Patent number: 8861724Abstract: This disclosure is directed for improved techniques for configuring a device to generate a secondary password based at least in part on a secure authentication key. The techniques of this disclosure may, in some examples, provide for capturing, by a computing device, an image of a display of another computing device. The captured image includes at least one encoded graphical image, such as a barcode, that includes an indication of the content of a secure authentication key. The computing device may use the secure authentication key to generate a secondary password to be used in conjunction with a primary password to gain access to a password-protected web service.Type: GrantFiled: September 30, 2011Date of Patent: October 14, 2014Assignee: Google Inc.Inventors: Stephen A. Weis, Travis E. McCoy, Andrew D. Hintz, Iain P. Wade
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Patent number: 8855300Abstract: This disclosure is directed for improved techniques for configuring a device to generate a secondary password based at least in part on a secure authentication key. The techniques of this disclosure may, in some examples, provide for capturing, by a computing device, an image of a display of another computing device. The captured image includes at least one encoded graphical image, such as a barcode, that includes an indication of the content of a secure authentication key. The computing device may use the secure authentication key to generate a secondary password to be used in conjunction with a primary password to gain access to a password-protected web service.Type: GrantFiled: September 30, 2010Date of Patent: October 7, 2014Assignee: Google Inc.Inventors: Stephen A. Weis, Travis E. McCoy, Andrew D. Hintz, Iain P. Wade
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Patent number: 8639487Abstract: An automated system-on-chip (SOC) hardware and software cogeneration design flow allows an SOC designer, using a single source description for any platform-independent combination of reused or new IP blocks, to produce a configured hardware description language (HDL) description of the circuitry necessary to implement the SOC, while at the same time producing the development tools (e.g., compilers, assemblers, debuggers, simulator, software support libraries, reset sequences, etc.) used to generate the SOC software and the diagnostics environment used to verify the SOC.Type: GrantFiled: March 25, 2003Date of Patent: January 28, 2014Assignee: Cadence Design Systems, Inc.Inventors: Gulbin Ayse Ezer, Pavlos Konas, John Barrett Andrews, Stephen Wei Chou, Eileen Margaret Peters Long, Marc Alan Evans
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Publication number: 20130073061Abstract: A method of model identification for a process with unknown initial conditions in an industrial plant, the method comprising collecting a set of manipulated variables and corresponding set of process variables from the process; obtaining a plurality of manipulated variables from the collected set of manipulated variables; for each of the plurality of manipulated variables, obtaining optimal model parameters of a model transfer function and computing a model fitting index for optimized simulated process variables generated by the model transfer function using the optimal model parameters; identifying a best model fitting index among the model fitting indices computed; selecting a manipulated variable associated with the best model fitting index as an initial steady state condition for the model transfer function; and selecting the optimal model parameters corresponding with the best model fitting index as the best model parameters of the model transfer function to tune the controller.Type: ApplicationFiled: September 19, 2011Publication date: March 21, 2013Applicant: YOKOGAWA ELECTRIC CORPORATIONInventors: Shengjing Mu, Stephen Wei Hong Weng, Joseph Ching Hua Lee
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Publication number: 20130067245Abstract: Security of information—both code and data—stored in a computer's system memory is provided by an agent loaded into and at run time resident in a CPU cache. Memory writes from the CPU are encrypted by the agent before writing and reads into the CPU are decrypted by the agent before they reach the CPU. The cache-resident agent also optionally validates the encrypted information stored in the system memory. Support for I/O devices and cache protection from unsafe DMA of the cache by devices is also provided.Type: ApplicationFiled: September 13, 2012Publication date: March 14, 2013Inventors: ODED HOROVITZ, Stephen A. Weis, Carl A, Waldspurger, Sahil Rihan
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Patent number: 8384546Abstract: This invention relates to security protocols for RFID systems. Systems and methods are presented to protect the system from hackers attempting to compromise the RFID system. Also, methods and systems for improving RFID security are disclosed. The systems utilize mechanisms to determine the authenticity of the RFID tags used in such systems. The systems and methods also reduce unauthorized access to the RFID system. A system and method to make tags more difficult to compromise or counterfeit is also described.Type: GrantFiled: November 14, 2006Date of Patent: February 26, 2013Assignee: Massachusetts Institute of TechnologyInventors: Joseph T. Foley, Sanjay Sarma, Stephen A. Weis
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Publication number: 20120084846Abstract: This disclosure is directed for improved techniques for configuring a device to generate a secondary password based at least in part on a secure authentication key. The techniques of this disclosure may, in some examples, provide for capturing, by a computing device, an image of a display of another computing device. The captured image includes at least one encoded graphical image, such as a barcode, that includes an indication of the content of a secure authentication key. The computing device may use the secure authentication key to generate a secondary password to be used in conjunction with a primary password to gain access to a password-protected web service.Type: ApplicationFiled: September 30, 2011Publication date: April 5, 2012Applicant: GOOGLE INC.Inventors: Stephen A. Weis, Travis E. McCoy, Andrew D. Hintz, Iain P. Wade
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Publication number: 20120084571Abstract: This disclosure is directed for improved techniques for configuring a device to generate a secondary password based at least in part on a secure authentication key. The techniques of this disclosure may, in some examples, provide for capturing, by a computing device, an image of a display of another computing device. The captured image includes at least one encoded graphical image, such as a barcode, that includes an indication of the content of a secure authentication key. The computing device may use the secure authentication key to generate a secondary password to be used in conjunction with a primary password to gain access to a password-protected web service.Type: ApplicationFiled: September 30, 2010Publication date: April 5, 2012Applicant: GOOGLE INC.Inventors: Stephen A. Weis, Travis E. McCoy, Andrew D. Hintz, Iain P. Wade
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Patent number: 8017938Abstract: A microarray apparatus is provided which contains at least one chip having source and drain electrodes positioned on an array of carbon nanotube transistors which allows for electronic detection of nucleic acid hybridizations, thereby affording both increased sensitivity and the capability of miniaturization.Type: GrantFiled: March 19, 2007Date of Patent: September 13, 2011Assignees: The United States of America as represented by the Department of Health and Human Services, University of Maryland, College ParkInventors: Romel Del Rosario Gomez, Javed Khan, Herman Pandana, Konrad Aschenbach, Michael Fuhrer, Jun Stephen Wei
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Publication number: 20090267747Abstract: In accordance with the present invention, a radio frequency identification (RFID) tag for use with an RFID system which includes one or more RFID tag readers, includes a tag communication device adapted to communicate with each of the one or more tag readers, a one-way hash function stored on the RFID tag, and a memory having stored therein a metaID. The tags may be locked and unlocked. The system includes a reader and a database. The system communicates with the tags via a forward channel and a backward channel. The present invention can singulate one tag from several responding tags and acquire the ID for the singulated tag.Type: ApplicationFiled: March 23, 2009Publication date: October 29, 2009Inventors: Ronald L. Rivest, Daniel W. Engels, Sanjay Sarma, Stephen A. Weis
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Publication number: 20080297354Abstract: This invention relates to security protocols for RFID systems. Systems and methods are presented to protect the system from hackers attempting to compromise the RFID system. Also, methods and systems for improving RFID security are disclosed. The systems utilize mechanisms to determine the authenticity of the RFID tags used in such systems. The systems and methods also reduce unauthorized access to the RFID system. A system and method to make tags more difficult to compromise or counterfeit is also described.Type: ApplicationFiled: November 14, 2006Publication date: December 4, 2008Inventors: Joseph T. Foley, Sanjay Sarma, Stephen A. Weis
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Patent number: 7266986Abstract: A dynamic pressure testing or calibration system packaged as a portable unit for characterizing pressure sensors, such as transducers. Embodiments are packaged for carry on the body, are battery-operated, compatible with existing transducer mounts, and quickly learned and easily used by a single operator. The system supplies a pre-specified impulse (pressure pulse) of fluid, preferably a benign gas, such as air, or an inert gas such as helium or nitrogen. In select embodiments, the gas pulse has a fast rise time and its amplitude may be varied over a pre-specified dynamic range. For example, the rise time may emulate that of an impulse created during an explosion by a resultant pressure wave, i.e., less than 100 microseconds. Embodiments also incorporate a data acquisition capability that accurately captures and records both the supplied impulse and the response of the sensor under test.Type: GrantFiled: November 18, 2004Date of Patent: September 11, 2007Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Fred D. Shirley, Vincent P. Chiarito, Stanley C. Woodson, Patrick Walter, Stephen Weis
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Publication number: 20050103092Abstract: A dynamic pressure testing or calibration system packaged as a portable unit for characterizing pressure sensors, such as transducers. Embodiments are packaged for carry on the body, are battery-operated, compatible with existing transducer mounts, and quickly learned and easily used by a single operator. The system supplies a pre-specified impulse (pressure pulse) of fluid, preferably a benign gas, such as air, or an inert gas such as helium or nitrogen. In select embodiments, the gas pulse has a fast rise time and its amplitude may be varied over a pre-specified dynamic range. For example, the rise time may emulate that of an impulse created during an explosion by a resultant pressure wave, i.e., less than 100 microseconds. Embodiments also incorporate a data acquisition capability that accurately captures and records both the supplied impulse and the response of the sensor under test.Type: ApplicationFiled: November 18, 2004Publication date: May 19, 2005Inventors: Vincent Chiarito, Stanley Woodson, Patrick Walter, Stephen Weis
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Patent number: 5898517Abstract: A fiber optic modulation and demodulation system is disclosed. The system is configured as telemetry system for relaying signals from sensors in remote, harsh environments. Light is modulated using one or more optical reflective grating and piezoelectric crystal combinations, and demodulated using an interferometer system. The one or more modulators are driven by the responses of one or more sensors thereby modulating one or more carrier wavelengths of a carrier light source. The modulated light signal is transmitted from the sensor or sensors, over an optical fiber, to an interferometer which is used to demodulate the reflected signals and thereby determine the responses of one or more sensors. One embodiment of the invention set forth is that of a telemetry system linking sensors within a borehole to detection and processing equipment at the surface of the earth.Type: GrantFiled: January 15, 1998Date of Patent: April 27, 1999Inventor: R. Stephen Weis
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Patent number: 5808779Abstract: This invention is directed toward a fiber optic modulation and demodulation system, and more particularly directed toward a telemetry system for relaying signals from sensors in remote, harsh environments. Light is modulated using one or more optical reflective grating and piezoelectric crystal combinations, and demodulated using an interferometer system. The one or more modulators are driven by the responses of one or more sensors thereby modulating one or more carrier wavelengths of a carrier light source. The modulated light signal is transmitted from the sensor or sensors, over an optical fiber, to an interferometer which is used to demodulate the reflected signals and thereby determine the responses of one or more sensors. One embodiment of the invention set forth is that of a telemetry system linking sensors within a borehole to detection and processing equipment at the surface of the earth.Type: GrantFiled: May 16, 1997Date of Patent: September 15, 1998Assignee: Rock Bit InternationalInventor: R. Stephen Weis
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Patent number: 5675674Abstract: This invention is directed toward a fiber optic modulation and demodulation system, and more particularly directed toward a telemetry system for relaying signals from sensors in remote, harsh environments. Light is modulated using one or more optical reflective grating and piezoelectric crystal combinations, and demodulated using an interferometer system. The one or more modulators are driven by the responses of one or more sensors thereby modulating one or more carrier wavelengths of a carrier light source. The modulated light signal is transmitted from the sensor or sensors, over an optical fiber, to an interferometer which is used to demodulate the reflected signals and thereby determine the responses of one or more sensors. One embodiment of the invention set forth is that of a telemetry system linking sensors within a borehole to detection and processing equipment at the surface of the earth.Type: GrantFiled: August 24, 1995Date of Patent: October 7, 1997Assignee: RockBit InternationalInventor: R. Stephens Weis
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Patent number: 4049380Abstract: A composition of material is disclosed which comprises sintered carbide-binder metal alloys. The carbide is a solid solution of hexagonal tungsten monocarbide and molybdenum monocarbide of stoichiometric composition containing between 10 and 100 mole percent molybdenum monocarbide. The binder is selected from the metals of the iron group, and comprises between 3 and 50 weight percent of the composition. A method for making the hexagonal carbide is also disclosed.Type: GrantFiled: May 29, 1975Date of Patent: September 20, 1977Assignee: Teledyne Industries, Inc.Inventors: Stephen Wei Hong Yih, Samuel Austin Worcester, Jr., Erwin Rudy