Nippon Telegraph and Telephone Corporation

Ntt Corporation

Takehiro Kawata

Akio Watanabe

Yoichi Matsuo

Ken Nishimatsu

Hiroki Ikeuchi

Tatsuaki Kimura

A system state estimation apparatus to estimate a system state in a system that outputs log data upon executing a user action, the system state estimation apparatus includes a memory; and a processor configured to execute using log data accumulated in advance, to generate a stochastic model in which a system state and a user action are associated with log data when the user action is executed in the system state; and determining a user action that contributes to identification of the system state in the system, based on a probability distribution of the system state and the stochastic model.

System state estimation apparatus, system state estimation method and program

A failure effects estimating device includes an input unit that inputs a log and a traffic amount obtained from a communication system when an abnormality occurs, an estimating unit that estimates a failure effects amount in the communication system, on the basis of the log and the traffic amount, and an output unit that outputs the failure effects amount estimated by the estimating unit.

Failure influence estimation apparatus, failure influence estimation method and program

A recovery support apparatus includes an index value calculation means which calculates a predetermined index value with respect to a recovery work sequence on the basis of the recovery work sequence indicating a work procedure for recovery from an abnormality that has occurred in an apparatus group constituting a communication network, and an output means which outputs the index value calculated by the index value calculation means to a predetermined output destination.

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Tokyo, Japan

Takehiro Kawata