Patents by Inventor Kishor S. Trivedi
Kishor S. Trivedi 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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Patent number: 8665731Abstract: A computer-based method for determining a probability that no path exists from a starting node to a target node within a network of nodes and directional links between pairs of nodes. The nodes and directional links form paths of a reliability graph and the method is performed using a computer coupled to a database. The method includes selecting a set of paths between the starting node and the target node that have been determined to be reliable, calculating a reliability of the union of the selected path sets, setting an upper bound for unreliability of the set of all paths, selecting a set of minimal cutsets from all cutsets that lie between the starting node and the target node, calculating the probability of the union of the minimal cutsets, and setting a lower bound for the unreliability of the set of all cutsets.Type: GrantFiled: February 20, 2012Date of Patent: March 4, 2014Assignee: The Boeing CompanyInventors: Anapathur V. Ramesh, Kishor S. Trivedi, Tilak C. Sharma, Dazhi Wang, David William Twigg, Le P. Nguyen, Yun Liu
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Patent number: 8121042Abstract: A computer-based method for determining a probability that no path exists from a specified starting node to a specified target node within a network of nodes and directional links between pairs of nodes is described. The nodes and directional links form paths of a reliability graph and the method is performed using a computer coupled to a database that includes data relating to the nodes and the directional links The method includes selecting a set of paths, from the set of all paths, between the starting node and the target node that have been determined to be reliable, calculating a reliability of the union of the selected path sets, setting an upper bound for the unreliability of the set of all paths, based on the calculated reliability, selecting a set of minimal cutsets from all such cutsets that lie between the starting node and the target node, calculating the probability of the union of the minimal cutsets, and setting a lower bound for the unreliability of the set of all cutsets.Type: GrantFiled: June 29, 2009Date of Patent: February 21, 2012Assignee: The Boeing CompanyInventors: Dazhi Wang, Kishor S. Trivedi, Tilak C. Sharma, Anapathur V. Ramesh, David William Twigg, Le P. Nguyen, Yun Liu
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Publication number: 20090323539Abstract: A computer-based method for determining a probability that no path exists from a specified starting node to a specified target node within a network of nodes and directional links between pairs of nodes is described. The nodes and directional links form paths of a reliability graph and the method is performed using a computer coupled to a database that includes data relating to the nodes and the directional links. The method includes selecting a set of paths, from the set of all paths, between the starting node and the target node that have been determined to be reliable, calculating a reliability of the union of the selected path sets, setting an upper bound for the unreliability of the set of all paths, based on the calculated reliability, selecting a set of minimal cutsets from all such cutsets that lie between the starting node and the target node, calculating the probability of the union of the minimal cutsets, and setting a lower bound for the unreliability of the set of all cutsets.Type: ApplicationFiled: June 29, 2009Publication date: December 31, 2009Inventors: Dazhi Wang, Kishor S. Trivedi, Tilak C. Sharma, Anapathur V. Ramesh, David William Twigg, Le P. Nguyen, Yun Liu
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Patent number: 7100079Abstract: One embodiment of the present invention provides a system that facilitates using a multi-variate pattern-recognition technique to trigger software rejuvenation for a computer system. The system operates by periodically measuring values of a target set of performance parameters associated with the computer system while the computer system is operating. The system then predicts values for the target set of performance parameters based upon previously determined correlations between performance parameters in the target set of performance parameters. If the predicted values deviate beyond a predetermined threshold from the measured values, thereby indicating that software aging is likely to have occurred, the system schedules a software rejuvenation operation for the computer system.Type: GrantFiled: October 22, 2002Date of Patent: August 29, 2006Assignee: Sun Microsystems, Inc.Inventors: Kenny C. Gross, Kishor S. Trivedi
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Methods and systems for improving utilization of traffic channels in a mobile communications network
Patent number: 7099672Abstract: Methods and systems for improving utilization of traffic channels in a mobile communications network. A method for allocating communication channels is provided for allocating communication channels for handoff in a first base station having a communication link with active mobile stations located in a handoff area of the first base station and a second base station. The method includes constructing a channel convertible set including communication channels for active mobile stations moving in a direction away from the first base station; receiving a handoff request from a requesting mobile station having a communication link with the second base station; and determining whether a free channel is available for the handoff request. Furthermore, the method includes allocating one of the communication channels in the channel convertible set to the handoff request if a free channel is not available for the handoff request.Type: GrantFiled: February 6, 2002Date of Patent: August 29, 2006Assignee: Duke UniversityInventors: Xiaomin Ma, Yun Liu, Kishor S. Trivedi -
Patent number: 7092437Abstract: Methods and Systems for Determining an Optimal Training Interval in a Communications System. A method is provided for determining an optimal training interval for a channel of a communications system. The method can include a step for receiving first channel estimations of a signal carried by a channel of a communications system, wherein the first channel estimations are generated by a first channel estimator. The communications system can include a normal mode for utilizing the channel to carry user data, a training mode for training the first channel estimator, and a failure mode for recovering channel communication after channel failure. The method can include a step for determining a time distribution of the channel transition from the normal mode to the failure mode, wherein channel failure occurs when error in the first channel estimations exceeds a first predetermined threshold.Type: GrantFiled: April 25, 2003Date of Patent: August 15, 2006Assignee: Duke UniversityInventors: Dongyan Chen, Yiguang Hong, Kishor S. Trivedi
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Publication number: 20040213361Abstract: Methods and Systems for Determining an Optimal Training Interval in a Communications System. A method is provided for determining an optimal training interval for a channel of a communications system. The method can include a step for receiving first channel estimations of a signal carried by a channel of a communications system, wherein the first channel estimations are generated by a first channel estimator. The communications system can include a normal mode for utilizing the channel to carry user data, a training mode for training the first channel estimator, and a failure mode for recovering channel communication after channel failure. The method can include a step for determining a time distribution of the channel transition from the normal mode to the failure mode, wherein channel failure occurs when error in the first channel estimations exceeds a first predetermined threshold.Type: ApplicationFiled: April 25, 2003Publication date: October 28, 2004Applicant: Duke UniversityInventors: Dongyan Chen, Yiguang Hong, Kishor S. Trivedi
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Publication number: 20040078657Abstract: One embodiment of the present invention provides a system that facilitates using a multi-variate pattern-recognition technique to trigger software rejuvenation for a computer system. The system operates by periodically measuring values of a target set of performance parameters associated with the computer system while the computer system is operating. The system then predicts values for the target set of performance parameters based upon previously determined correlations between performance parameters in the target set of performance parameters. If the predicted values deviate beyond a predetermined threshold from the measured values, thereby indicating that software aging is likely to have occurred, the system schedules a software rejuvenation operation for the computer system.Type: ApplicationFiled: October 22, 2002Publication date: April 22, 2004Inventors: Kenny C. Gross, Kishor S. Trivedi
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Methods and systems for improving utilization of traffic channels in a mobile communications network
Publication number: 20030148765Abstract: Methods and systems for improving utilization of traffic channels in a mobile communications network. A method for allocating communication channels is provided for allocating communication channels for handoff in a first base station having a communication link with active mobile stations located in a handoff area of the first base station and a second base station. The method includes constructing a channel convertible set including communication channels for active mobile stations moving in a direction away from the first base station; receiving a handoff request from a requesting mobile station having a communication link with the second base station; and determining whether a free channel is available for the handoff request. Furthermore, the method includes allocating one of the communication channels in the channel convertible set to the handoff request if a free channel is not available for the handoff request.Type: ApplicationFiled: February 6, 2002Publication date: August 7, 2003Inventors: Xiaomin Ma, Yun Liu, Kishor S. Trivedi