Patents by Inventor Takahiro Fujita

Takahiro Fujita 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).

  • Publication number: 20140229419
    Abstract: A root cause analysis engine uses event survival times and gradual deletion of events to improve analysis accuracy and reduce the number of required calculations. Certainty factors of relevant rules are recalculated every time notification of an event is received. The calculation results are held in a rule memory in the analysis engine. Each event has a survival time, and when the time has expired, that event is deleted from the rule memory. Events held in the rule memory can be deleted without affecting other events held in the rule memory. The analysis engine can then re-calculate the certainty factor of each rule by only performing the re-calculation with respect to affected rules that are related with the deleted event. The calculation cost can be reduced because analysis engine processes events incrementally or decrementally.
    Type: Application
    Filed: April 16, 2014
    Publication date: August 14, 2014
    Applicant: Hitachi, Ltd.
    Inventors: Yutaka KUDO, Tetsuya MASUISHI, Takahiro FUJITA, Tomohiro MORIMURA
  • Patent number: 8732111
    Abstract: A root cause analysis engine uses event survival times and gradual deletion of events to improve analysis accuracy and reduce the number of required calculations. Certainty factors of relevant rules are recalculated every time notification of an event is received. The calculation results are held in a rule memory in the analysis engine. Each event has a survival time, and when the time has expired, that event is deleted from the rule memory. Events held in the rule memory can be deleted without affecting other events held in the rule memory. The analysis engine can then re-calculate the certainty factor of each rule by only performing the re-calculation with respect to affected rules that are related with the deleted event. The calculation cost can be reduced because analysis engine processes events incrementally or decrementally.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: May 20, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Kudo, Takahiro Fujita, Tetsuya Masuishi, Tomohiro Morimura
  • Publication number: 20140082423
    Abstract: A technique determines which configuration change(s) caused an application invocation failure of a computer application without the need for a knowledge database. To determine which configuration change is the most likely cause, the cause analysis program checks other computers that have experienced the same configuration changes. The cause analysis program checks and counts the application invocation results before and after each configuration change is done. If the same configuration changes are found in the other computers, the program checks whether each configuration change caused or cured the same problem in that computer. The program counts the similar cases for all of the computers. Subsequently, the program calculates the ratio of those instances involving a change from success to failure and the ratio of those instances involving a change from failure to success out of all instances for each configuration change.
    Type: Application
    Filed: November 21, 2013
    Publication date: March 20, 2014
    Applicant: Hitachi, Ltd.
    Inventors: Yutaka KUDO, Tetsuya MASUISHI, Takahiro FUJITA, Yoshitsugu ONO
  • Publication number: 20140025621
    Abstract: A root cause analysis engine uses event survival times and gradual deletion of events to improve analysis accuracy and reduce the number of required calculations. Certainty factors of relevant rules are recalculated every time notification of an event is received. The calculation results are held in a rule memory in the analysis engine. Each event has a survival time, and when the time has expired, that event is deleted from the rule memory. Events held in the rule memory can be deleted without affecting other events held in the rule memory. The analysis engine can then re-calculate the certainty factor of each rule by only performing the re-calculation with respect to affected rules that are related with the deleted event. The calculation cost can be reduced because analysis engine processes events incrementally or decrementally.
    Type: Application
    Filed: September 27, 2013
    Publication date: January 23, 2014
    Applicant: Hitachi, Ltd.
    Inventors: Yutaka KUDO, Tetsuya MASUISHI, Takahiro FUJITA, Tomohiro MORIMURA
  • Patent number: 8601319
    Abstract: A technique determines which configuration change(s) caused an application invocation failure of a computer application without the need for a knowledge database. To determine which configuration change is the most likely cause, the cause analysis program checks other computers that have experienced the same configuration changes. The cause analysis program checks and counts the application invocation results before and after each configuration change is done. If the same configuration changes are found in the other computers, the program checks whether each configuration change caused or cured the same problem in that computer. The program counts the similar cases for all of the computers. Subsequently, the program calculates the ratio of those instances involving a change from success to failure and the ratio of those instances involving a change from failure to success out of all instances for each configuration change.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: December 3, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Kudo, Tetsuya Masuishi, Takahiro Fujita, Yoshitsugu Ono
  • Patent number: 8583581
    Abstract: A root cause analysis engine uses event survival times and gradual deletion of events to improve analysis accuracy and reduce the number of required calculations. Certainty factors of relevant rules are recalculated every time notification of an event is received. The calculation results are held in a rule memory in the analysis engine. Each event has a survival time, and when the time has expired, that event is deleted from the rule memory. Events held in the rule memory can be deleted without affecting other events held in the rule memory. The analysis engine can then re-calculate the certainty factor of each rule by only performing the re-calculation with respect to affected rules that are related with the deleted event. The calculation cost can be reduced because analysis engine processes events incrementally or decrementally.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: November 12, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Kudo, Tetsuya Masuishi, Takahiro Fujita, Tomohiro Morimura
  • Publication number: 20130001805
    Abstract: The respective main electrodes of the semiconductor switching elements such as IGBTs, which are respectively mounted on the plurality of insulating boards, are electrically connected to each other via the conductor member. This configuration makes it possible to suppress the occurrence of the resonant voltage due to the junction capacity and the parasitic inductance of each semiconductor switching element.
    Type: Application
    Filed: June 26, 2012
    Publication date: January 3, 2013
    Inventors: Katsunori AZUMA, Kentaro Yasuda, Takahiro Fujita, Katsuaki Saito, Yoshihiko Koike, Michiaki Hiyoshi
  • Patent number: 8266285
    Abstract: In order to limit host computers permitted to control a storage area from host computers, provided is a storage management computer coupled to one or more host computers for providing services and one or more storage systems, in which the storage management computer judges whether the host computer is permitted to control the storage area based on data indicating the configuration information of the storage system and service management information for managing the services provided by the host computers, and in case of which it is judged that the host computer is permitted to control the storage area, the storage management computer sets access control data to permit the host computer to control the storage area.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: September 11, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Fujita, Kyoko Mikami, Yuichi Yagawa
  • Publication number: 20120117573
    Abstract: A root cause analysis engine uses event survival times and gradual deletion of events to improve analysis accuracy and reduce the number of required calculations. Certainty factors of relevant rules are recalculated every time notification of an event is received. The calculation results are held in a rule memory in the analysis engine. Each event has a survival time, and when the time has expired, that event is deleted from the rule memory. Events held in the rule memory can be deleted without affecting other events held in the rule memory. The analysis engine can then re-calculate the certainty factor of each rule by only performing the re-calculation with respect to affected rules that are related with the deleted event. The calculation cost can be reduced because analysis engine processes events incrementally or decrementally.
    Type: Application
    Filed: January 10, 2012
    Publication date: May 10, 2012
    Applicant: HITACHI, LTD.
    Inventors: Yutaka KUDO, Tetsuya MASUISHI, Takahiro FUJITA, Tomohiro MORIMURA
  • Publication number: 20120084387
    Abstract: In order to limit host computers permitted to control a storage area from host computers, provided is a storage management computer coupled to one or more host computers for providing services and one or more storage systems, in which the storage management computer judges whether the host computer is permitted to control the storage area based on data indicating the configuration information of the storage system and service management information for managing the services provided by the host computers, and in case of which it is judged that the host computer is permitted to control the storage area, the storage management computer sets access control data to permit the host computer to control the storage area.
    Type: Application
    Filed: December 12, 2011
    Publication date: April 5, 2012
    Inventors: Takahiro FUJITA, Kyoko Mikami, Yuichi Yagawa
  • Patent number: 8112378
    Abstract: A root cause analysis engine uses event durations and gradual deletion of events to improve analysis accuracy and reduce the number of required calculations. Matching ratios of relevant rules are recalculated every time notification of an event is received. The calculation results are held in a rule memory in the analysis engine. Each event has a valid duration, and when the duration has expired, that event is deleted from the rule memory. Events held in the rule memory can be deleted without affecting other events held in the rule memory. The analysis engine can then re-calculate the matching ratio of each rule by only performing the re-calculation with respect to affected rules related to the deleted event. The calculation cost can be reduced because analysis engine processes events incrementally or decrementally. Analysis engine can determine the most possible conclusion even if one or more condition elements were not true.
    Type: Grant
    Filed: June 17, 2008
    Date of Patent: February 7, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Kudo, Tetsuya Masuishi, Takahiro Fujita, Tomohiro Morimura
  • Patent number: 8086733
    Abstract: In order to limit host computers permitted to control a storage area from host computers, provided is a storage management computer coupled to one or more host computers for providing services and one or more storage systems, in which the storage management computer judges whether the host computer is permitted to control the storage area based on data indicating the configuration information of the storage system and service management information for managing the services provided by the host computers, and in case of which it is judged that the host computer is permitted to control the storage area, the storage management computer sets access control data to permit the host computer to control the storage area.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: December 27, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Fujita, Kyoko Mikami, Yuichi Yagawa
  • Publication number: 20110314138
    Abstract: In a computer system that comprises multiple target computers and an analysis computer, one or more first target computers, in which a predetermined application has been installed and invoked, send a log comprising information of multiple configuration changes that have been made prior to invoking the predetermined application to the analysis computer, and the analysis computer receives the log and computes, for each type of configuration change and based on the log, an invocation failure rate which is a percentage at which the invocation of the predetermined application fails subsequent to the configuration change. Then, a second target computer receives, from the analysis computer, first information comprising an invocation failure rate for each type of configuration change related to the predetermined application, and based on the invocation failure rate, displays the type of configuration change that is the cause of the failure of the predetermined application invocation.
    Type: Application
    Filed: July 7, 2010
    Publication date: December 22, 2011
    Applicant: HITACHI, LTD.
    Inventors: Emiko Kobayashi, Yutaka Kudo, Kiminori Sugauchi, Tetsuya Masuishi, Takahiro Fujita, Yoshitsugu Ono
  • Publication number: 20110307742
    Abstract: A technique determines which configuration change(s) caused an application invocation failure of a computer application without the need for a knowledge database. To determine which configuration change is the most likely cause, the cause analysis program (121) checks other computers (102) that have experienced the same configuration changes. The cause analysis program checks and counts the application invocation results before and after each configuration change is done. If the same configuration changes are found in the other computers, the program checks whether each configuration change caused or cured the same problem in that computer. The program counts the similar cases for all of the computers. Subsequently, the program calculates the ratio of those instances involving a change from success to failure and the ratio of those instances involving a change from failure to success out of all instances for each configuration change.
    Type: Application
    Filed: August 19, 2011
    Publication date: December 15, 2011
    Applicant: HITACHI, LTD.
    Inventors: Yutaka KUDO, Tetsuya MASUISHI, Takahiro FUJITA, Yoshitsugu ONO
  • Patent number: 8078904
    Abstract: Provided is a method of managing a computer system including a plurality of storage systems and a plurality of management appliances for managing the plurality of storage systems. A first management appliance and a second management appliance hold an identifier of a first storage system and management data obtained from the first storage system. The method includes the steps of: selecting a third management appliance from the plurality of management appliances when a failure occurs in the first management appliance; transmitting the identifier held in the second management appliance from the second management appliance to the selected third management appliance; and holding the identifier transmitted from the second management appliance in the selected third management appliance. Thus, it is possible to prevent, after failing-over due to an abnormality of a maintenance/management appliance, a single point of failure from occurring to reduce reliability of the maintenance/management appliance.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: December 13, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Fujita, Hirokazu Ikeda, Nobuyuki Osaki
  • Publication number: 20110278669
    Abstract: Disclosed is a high-voltage diode structure which realizes high reverse recovery capability and high maximum allowable forward current. The distance between a longitudinal end of a p well layer in an anode region and an element isolation region formed to surround the diode is 5 ?m or shorter so as to allow a depletion layer to reach the element isolation region when a maximum rated reverse voltage is applied. During reverse recovery, the electric field strength at an end portion of a p well layer is reduced, hole current is reduced, and local temperature rises are reduced.
    Type: Application
    Filed: May 11, 2011
    Publication date: November 17, 2011
    Inventors: Tomoyuki MIYOSHI, Shinichiro Wada, Takayuki Oshima, Yohei Yanagida, Takahiro Fujita
  • Patent number: 8024617
    Abstract: A technique determines which configuration change(s) caused an application invocation failure of a computer application without the need for a knowledge database. To determine which configuration change is the most likely cause, the cause analysis program (121) checks other computers (102) that have experienced the same configuration changes. The cause analysis program checks and counts the application invocation results before and after each configuration change is done. If the same configuration changes are found in the other computers, the program checks whether each configuration change caused or cured the same problem in that computer. The program counts the similar cases for all of the computers. Subsequently, the program calculates the ratio of those instances involving a change from success to failure and the ratio of those instances involving a change from failure to success out of all instances for each configuration change.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: September 20, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Kudo, Tetsuya Masuishi, Takahiro Fujita, Yoshitsugu Ono
  • Publication number: 20110047410
    Abstract: Provided is a method of managing a computer system including a plurality of storage systems and a plurality of management appliances for managing the plurality of storage systems. A first management appliance and a second management appliance hold an identifier of a first storage system and management data obtained from the first storage system. The method includes the steps of selecting a third management appliance from the plurality of management appliances when a failure occurs in the first management appliance; transmitting the identifier held in the second management appliance from the second management appliance to the selected third management appliance; and holding the identifier transmitted from the second management appliance in the selected third management appliance. Thus, it is possible to prevent, after failing-over due to an abnormality of a maintenance/management appliance, a single point of failure from occurring to reduce reliability of the maintenance/management appliance.
    Type: Application
    Filed: October 29, 2010
    Publication date: February 24, 2011
    Applicant: HITACHI, LTD.
    Inventors: Takahiro FUJITA, Hirokazu IKEDA, Nobuyuki OSAKI
  • Publication number: 20110047414
    Abstract: A technique determines which configuration change(s) caused an application invocation failure of a computer application without the need for a knowledge database. To determine which configuration change is the most likely cause, the cause analysis program (121) checks other computers (102) that have experienced the same configuration changes. The cause analysis program checks and counts the application invocation results before and after each configuration change is done. If the same configuration changes are found in the other computers, the program checks whether each configuration change caused or cured the same problem in that computer. The program counts the similar cases for all of the computers. Subsequently, the program calculates the ratio of those instances involving a change from success to failure and the ratio of those instances involving a change from failure to success out of all instances for each configuration change.
    Type: Application
    Filed: March 30, 2009
    Publication date: February 24, 2011
    Inventors: Yutaka Kudo, Tetsuya Masuishi, Takahiro Fujita, Yoshitsugu Ono
  • Patent number: 7836333
    Abstract: Provided is a method of managing a computer system including a plurality of storage systems and a plurality of management appliances for managing the plurality of storage systems. A first management appliance and a second management appliance hold an identifier of a first storage system and management data obtained from the first storage system. The method includes the steps of: selecting a third management appliance from the plurality of management appliances when a failure occurs in the first management appliance; transmitting the identifier held in the second management appliance from the second management appliance to the selected third management appliance; and holding the identifier transmitted from the second management appliance in the selected third management appliance. Thus, it is possible to prevent, after failing-over due to an abnormality of a maintenance/management appliance, a single point of failure from occurring to reduce reliability of the maintenance/management appliance.
    Type: Grant
    Filed: January 9, 2008
    Date of Patent: November 16, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Fujita, Hirokazu Ikeda, Nobuyuki Osaki