Patents by Inventor Jagannathan Sarangapani

Jagannathan Sarangapani 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: 10198605
    Abstract: A method comprises using at least one of a reader and a passive tag to exchange values according to an ultra-lightweight mutual authentication protocol with a substitution operation to change a Hamming weight of the values.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: February 5, 2019
    Assignees: The Boeing Company, Missouri University of Science and Technology
    Inventors: Ali Salour, Douglas D. Trimble, Jagannathan Sarangapani, Eyad S. Taqieddin
  • Patent number: 9689964
    Abstract: A super regenerative receiver detection system and method that includes a computing system that stores and executes a cross modulation correlation component to modulate a radio-frequency (RF) stimulation signal that is transmitted in an area using a modulating signal having a first modulating mode, and receive a response UEE signal from the area in which the response UEE signal includes a cross modulated signal emitted from a super regenerative receiver (SRR). The cross modulated signal having a second modulation mode that is different from the first modulation mode. Using this information, the cross modulation correlation component processes the received UEE signal to determine a cross modulation correlation level of a cross modulation signal relative to the modulating signal, and generates an alert signal when the determined cross modulation correlation level exceeds a specified threshold.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: June 27, 2017
    Assignee: The Curators of the University of Missouri
    Inventors: Jagannathan Sarangapani, Maciej Jan Zawodniok, Vivek Thotla, Mohammad Tayeb Ghasr, Jake Hertenstein
  • Publication number: 20160216358
    Abstract: A super regenerative receiver detection system and method that includes a computing system that stores and executes a cross modulation correlation component to modulate a radio-frequency (RF) stimulation signal that is transmitted in an area using a modulating signal having a first modulating mode, and receive a response UEE signal from the area in which the response UEE signal includes a cross modulated signal emitted from a super regenerative receiver (SRR). The cross modulated signal having a second modulation mode that is different from the first modulation mode. Using this information, the cross modulation correlation component processes the received UEE signal to determine a cross modulation correlation level of a cross modulation signal relative to the modulating signal, and generates an alert signal when the determined cross modulation correlation level exceeds a specified threshold.
    Type: Application
    Filed: April 23, 2014
    Publication date: July 28, 2016
    Applicant: The Curators of the University of Missouri
    Inventors: Jagannathan Sarangapani, Maciej Jan Zawodniok, Vivek Thotla, Mohammad Tayeb Ghasr, Jake Hertenstein
  • Patent number: 8143996
    Abstract: A decentralized RFID system and method provides a decentralized power control scheme for adaptively adjusting the power of a RFID reader in a network of readers communicating with an RFID tag. The transmission power of each reader in a dense network environment is controlled as a function of interference sensed from other readers in the network and a current SNR (SNR) of a backscatter signal received from the tag. If the current SNR is above a required SNR, transmission power of the reader is reduced, which results in lower interference for other RFID readers. Similarly, if the expected SNR is below the required threshold, power is increased sufficiently to ensure that the target or required SNR is achieved.
    Type: Grant
    Filed: January 8, 2008
    Date of Patent: March 27, 2012
    Assignee: The Curators of the University of Missouri
    Inventors: Jagannathan Sarangapani, Anil Ramachandran, Can Saygin, Kainan Cha
  • Patent number: 8129887
    Abstract: Embodiments of the present invention provide a system and a method for increasing the harvested energy from a piezoelectric element exposed to environmental vibrations via a two-prong system. In a first prong, a cantilever beam is tapered and shaped so as to increase and provide an approximately uniform strain on and along the beam, thus resulting in increased voltage. In a second prong of the system and method, a voltage compensating circuit, when used with a voltage inversion circuit of the prior art, increases the harvested power by injecting current to the piezoelectric element after each voltage inversion so as to increase the voltage level.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: March 6, 2012
    Assignee: The Curators of the University of Missouri
    Inventors: Shahab Mehraeen, Jagannathan Sarangapani
  • Publication number: 20100194239
    Abstract: Embodiments of the present invention provide a system and a method for increasing the harvested energy from a piezoelectric element exposed to environmental vibrations via a two-prong system. In a first prong, a cantilever beam is tapered and shaped so as to increase and provide an approximately uniform strain on and along the beam, thus resulting in increased voltage. In a second prong of the system and method, a voltage compensating circuit, when used with a voltage inversion circuit of the prior art, increases the harvested power by injecting current to the piezoelectric element after each voltage inversion so as to increase the voltage level.
    Type: Application
    Filed: January 30, 2009
    Publication date: August 5, 2010
    Applicant: The Curators of the University of Missouri
    Inventors: Shahab Mehraeen, Jagannathan Sarangapani
  • Patent number: 7752089
    Abstract: An adaptive inventory management system and method eliminates or minimizes frequency interference issues within a facility that employs a plurality of RFID readers for purposes of tracking and managing inventory. A middleware server activates and deactivates adjacent RFID readers within the facility based on the location of an item having an RFID tag. The middleware server also queries an inventory database based on the information collected from the RFID tag of the item and generates a command signal based on information retrieved from the database to control the travel route of the vehicle transporting items of inventory within the facility.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: July 6, 2010
    Assignee: The Curators of the University of Missouri
    Inventors: Jagannathan Sarangapani, Anil Ramachandran, Can Saygin, Kainan Cha
  • Publication number: 20100106458
    Abstract: Embodiments of the present invention provide a method implemented by a computer program for detecting and identifying valve failure in a reciprocating compressor and further for predicting valve failure in the compressor. Embodiments of the present invention detect and predict the valve failure using wavelet analysis, logistic regression, and neural networks. A pressure signal from the valve of the reciprocating compressor presents a non-stationary waveform from which features can be extracted using wavelet packet decomposition. The extracted features, along with temperature data for the valve, are used to train a logistic regression model to classify defective and normal operation of the valve. The wavelet features extracted from the pressure signal are also used to train a neural network model to predict to predict the future trend of the pressure signal of the system, which is used as an indicator for performance assessment and for root cause detection of the compressor valve failures.
    Type: Application
    Filed: October 28, 2008
    Publication date: April 29, 2010
    Inventors: Ming C. Leu, Jagannathan Sarangapani, Raghuram Puthall Ramesh
  • Publication number: 20090012882
    Abstract: An adaptive inventory management system and method eliminates or minimizes frequency interference issues within a facility that employs a plurality of RFID readers for purposes of tracking and managing inventory. A middleware server activates and deactivates adjacent RFID readers within the facility based on the location of an item having an RFID tag. The middleware server also queries an inventory database based on the information collected from the RFID tag of the item and generates a command signal based on information retrieved from the database to control the travel route of the vehicle transporting items of inventory within the facility.
    Type: Application
    Filed: February 26, 2008
    Publication date: January 8, 2009
    Inventors: Jagannathan Sarangapani, Anil Ramachandran, Can Saygin, Kainan Cha
  • Publication number: 20080174410
    Abstract: A decentralized RFID system and method provides a decentralized power control scheme for adaptively adjusting the power of a RFID reader in a network of readers communicating with an RFID tag. The transmission power of each reader in a dense network environment is controlled as a function of interference sensed from other readers in the network and a current SNR (SNR) of a backscatter signal received from the tag. If the current SNR is above a required SNR, transmission power of the reader is reduced, which results in lower interference for other RFID readers. Similarly, if the expected SNR is below the required threshold, power is increased sufficiently to ensure that the target or required SNR is achieved.
    Type: Application
    Filed: January 8, 2008
    Publication date: July 24, 2008
    Inventors: Jagannathan Sarangapani, Anil Ramachandran, Can Saygin, Kainan Cha
  • Patent number: 6442511
    Abstract: A method and apparatus for determining severity of a trend toward an impending machine failure under actual operating conditions. The method and apparatus includes providing a typical failure trend based on a set of normal operating conditions for the machine, determining a slope value for the typical failure trend, determining a slope value for the trend toward the impending machine failure under the actual or proposed operating conditions, determining a weight value for at least the actual or proposed operating conditions, and determining the severity as a function of the slope values and the weight value.
    Type: Grant
    Filed: September 3, 1999
    Date of Patent: August 27, 2002
    Assignee: Caterpillar Inc.
    Inventors: Jagannathan Sarangapani, Sri K. Rangarajan
  • Patent number: 6363332
    Abstract: An apparatus for predicting a fault condition for a machine is disclosed. The machine has a plurality of parameters being dependent upon machine performance. A sensor is connected to the machine and is adapted to produce an electrical signal in response to one of the plurality of machine parameters. The apparatus further includes means for determining a non-linear data trend of the parameter in response to the electrical signal, and means for predicting the fault condition as a function of the trend and a threshold value indicative of the fault condition. In a second aspect of the invention, a method for predicting a fault condition is provided. The method includes the steps of sensing a parameter having a level being dependent upon machine performance and responsively producing an electrical signal, determining a non-linear data trend of the parameter in response to the electrical signal, and predicting the fault condition as a function of the trend and threshold value indicative of the fault condition.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: March 26, 2002
    Assignee: Caterpillar Inc.
    Inventors: Sri K. Rangarajan, Jagannathan Sarangapani
  • Patent number: 6240343
    Abstract: An apparatus and method for diagnosing an engine using computer based models in combination with a neural network which reduces the neural network training and updating required is disclosed. The method and apparatus determine modeled values for a plurality of engine parameters as a function of sensed values in a plurality of initial values; sense a plurality of actual values for the engine parameters; and determine a difference between the actual values and the modeled values for the respective engine parameters. The differences are inputted into a neural network which generates an output pattern as a function of the differences and a plurality of weight values. The weight values and the initial values are then updated as a function of a comparison between the output patterns and a desired pattern, and the engine is responsively diagnosed as a function of the output pattern.
    Type: Grant
    Filed: December 28, 1998
    Date of Patent: May 29, 2001
    Assignee: Caterpillar Inc.
    Inventors: Jagannathan Sarangapani, David R. Schricker
  • Patent number: 6173215
    Abstract: A method is disclosed for responding to the detection of an obstacle in the path of a mobile machine as the mobile machine traverses the path at a work site. The method includes the steps of scanning a field of interest, detecting the presence of an obstacle, and determining a set of parameters as a function of the mobile machine, the obstacle, and the work site. The method also includes the steps of determining a level of predictability of motion of the obstacle, defining ranges of a plurality of zones as a function of the level of predictability and the parameters, and initiating an action in response to the obstacle being in one of the zones.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: January 9, 2001
    Assignee: Caterpillar Inc.
    Inventor: Jagannathan Sarangapani
  • Patent number: 6134502
    Abstract: A method for determining an alternate path by a mobile machine to avoid at least one obstacle. The method includes the steps of assigning an initial value of charge to the mobile machine, assigning a value of charge to a desired destination, determining the presence and the locations of at least one obstacle, and assigning a value of charge to each determined obstacle. The method further includes the steps of determining a force vector equation for each of the desired destination and each obstacle with respect to the mobile machine, determining a resultant force vector as a function of the force vector equations, and controlling the steering and movement of the mobile machine in response to the resultant force vector.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: October 17, 2000
    Assignee: Caterpillar Inc.
    Inventor: Jagannathan Sarangapani
  • Patent number: 6119074
    Abstract: An apparatus for predicting a fault condition for a machine is disclosed. The machine has a plurality of parameters being dependent upon machine performance. A sensor connected to the machine produces an electrical signal in response to one of the plurality of machine parameters. A computer produces a data trend of the parameter in response to the electrical signal, calculates the duration and slope of the trend, and predicts the time period in which the trend will exceed the warning level.
    Type: Grant
    Filed: May 20, 1998
    Date of Patent: September 12, 2000
    Assignee: Caterpillar Inc.
    Inventor: Jagannathan Sarangapani
  • Patent number: 6092016
    Abstract: An apparatus and method for diagnosing an engine including at least two cylinder banks using an exhaust temperature model is disclosed.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: July 18, 2000
    Assignee: Caterpillar, Inc.
    Inventors: Jagannathan Sarangapani, David R. Schricker
  • Patent number: 6064926
    Abstract: The present invention is a method and apparatus for planning an alternate path in response to detection of an obstacle by a mobile machine at a work site. The work site includes a fleet of mobile machines and a fleet manager. The method includes the steps of determining the presence and location of an obstacle in a primary path of the mobile machine, determining an alternate path around the obstacle, and delivering a signal to the fleet manager with the location of the obstacle and the alternate path.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: May 16, 2000
    Assignee: Caterpillar Inc.
    Inventors: Jagannathan Sarangapani, Carl A. Kemner
  • Patent number: 6055042
    Abstract: A method and apparatus is disclosed to detect an obstacle in the path of a mobile machine. The present invention scans a field of interest by each of a plurality of obstacle sensor systems, weights the scanned data received from the obstacle sensor systems, and determines at least one characteristic of the obstacle as a function of the weighted scanned data.
    Type: Grant
    Filed: December 16, 1997
    Date of Patent: April 25, 2000
    Assignee: Caterpillar Inc.
    Inventor: Jagannathan Sarangapani
  • Patent number: 5987976
    Abstract: A method for monitoring the condition of oil in an engine is disclosed which includes the steps of determining a plurality of parameters, determining a fuel injection model, determining the area of the cylinder walls that is coated with fuel, and responsively determining a total base number (TBN) model. The TBN determined from the model may be trended over time to predict the useful life of the oil.
    Type: Grant
    Filed: March 12, 1998
    Date of Patent: November 23, 1999
    Assignee: Caterpillar Inc.
    Inventor: Jagannathan Sarangapani