Patent Publication Number: US-11378943-B2

Title: Information processing device, information processing method, and program

Description:
TECHNICAL FIELD 
     The present invention relates to an information processing device, an information processing method, and a program. 
     The application is based on Japanese Patent Application No. 2017-065993 filed on Mar. 29, 2017, the content of which is incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     In a plant such as a power generation plant, it is conceivable that a monitoring device collect state quantities of a target device constituting the plant such as a temperature and a pressure at the time of the operation of the target device, and the collected state quantities be used to execute maintenance, monitoring, and the like of the device. 
     It has been proposed that the monitoring device process the collected operation data such that an operator of the device can easily use them and execute the maintenance, monitoring, and the like of the device. For example, in Patent Document 1, it is proposed that, when a computer detects omission portions of collected operation data of an industrial plant, the computer execute a complementary process and calculate values of omission state quantities. 
     In addition, it is known that models such as a physical model and a statistical model are used when values of omission state quantities are set through a complementary process. 
     DOCUMENTS OF RELATED ART 
     Patent Documents 
     Patent Document 1: United States Patent Application, Publication No. 2016/0004794 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     Patent Document 1 discloses that an information processing device executes a complementary process to complement a value of an omission state quantity, but does not disclose a specific method of setting a value of an omission state quantity. 
     Each of models used in a complementary process has adaptation conditions that are set based on an operation state of a target device, and the like, and a value of estimation data having higher accuracy is calculated as the degree of conformity with the adaptation conditions increases. However, a computer does not process an estimation value of a state quantity in consideration of adaptation conditions of each of the models and does not set the processed value as a value of the state quantity. 
     The present invention is contrived in view of the above-described problems, and an object thereof is to appropriately specify state quantity values used to manage a target device based on an estimation value of a state quantity calculated using a plurality of models. 
     Means to Solve the Problems 
     According to a first aspect of the present invention, an information processing device includes a statistics estimation unit configured to estimate a value of a state quantity by using a statistical model constructed based on values of past state quantities of a target device, a physical estimation unit configured to estimate a value of a state quantity by using a physical model constructed based on design data of the target device, and a specification unit configured to specify a value to be used to manage the target device from the value estimated by the statistics estimation unit and the value estimated by the physical estimation unit based on deterioration of the target device with time. 
     According to a second aspect of the present invention, in the information processing device according to the first aspect, the specification unit may be configured to specify a value to be used to manage the target device based on the amount of values of the past state quantities used to construct the statistical model. 
     According to a third aspect of the present invention, in the information processing device according to the first aspect, the specification unit may be configured to specify a value to be used to manage the target device based on predetermined application conditions of the physical model. 
     According to a fourth aspect of the present invention, in the information processing device according to any one of the first to third aspects, the specification unit may be configured to specify a value to be used to manage the target device based on an operation time of the target device. 
     According to a fifth aspect of the present invention, the information processing device according to any one of the first to fourth aspects may further include a notification unit configured to issue a notification in a case where a difference between the value estimated by the statistics estimation unit and the value estimated by the physical estimation unit is equal to or greater than a predetermined value. 
     According to a sixth aspect of the present invention, the information processing device according to any one of the first to fifth aspects may further include a model updating unit configured to update a statistical model based on the values of the past state quantities used to construct the statistical model, in which the specification unit may be configured to specify a value to be used to manage the target device by using the updated statistical model. 
     According to a seventh aspect of the present invention, in the information processing device according to any one of the first to sixth aspects, the specification unit may be configured to specify a weighted average value of the value estimated by the statistics estimation unit and the value estimated by the physical estimation unit using weights according to deterioration of the target device with time as a value to be used to manage the target device. 
     According to an eighth aspect of the present invention, an information processing method includes estimating a value of a state quantity by using a statistical model constructed based on values of past state quantities of a target device, estimating a value of a state quantity by using a physical model constructed based on design data of the target device, and specifying a value to be used to manage the target device from the value estimated using the statistical model and the value estimated using the physical model based on deterioration of the target device with time. 
     According to a ninth aspect of the present invention, a program causes a computer to estimate a value of a state quantity by using a statistical model constructed based on values of past state quantities of a target device, estimate a value of a state quantity by using a physical model constructed based on design data of the target device, and specify a value to be used to manage the target device from the value estimated using the statistical model and the value estimated using the physical model based on deterioration of the target device with time. 
     Effects of the Invention 
     According to at least one aspect of the above-described aspects, the information processing device specifies values to be used to manage a target device from an estimation value of a statistical model and an estimation value of a physical model based on deterioration of a target device with time. Thereby, it is possible to appropriately specify a value of a state quantity to be used to manage the target device. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic block diagram showing a configuration of a management system according to a first embodiment. 
         FIG. 2  is a schematic block diagram showing a configuration of a management device according to the first embodiment. 
         FIG. 3  is a flowchart showing operations of the management device according to the first embodiment. 
         FIG. 4  is a flowchart showing operations of a management device according to a second embodiment. 
         FIG. 5  is a schematic block diagram showing a configuration of a computer according to at least one embodiment. 
     
    
    
     EMBODIMENTS FOR CARRYING OUT THE INVENTION 
     First Embodiment 
     Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. 
     &lt;Overall Configuration&gt; 
       FIG. 1  is a schematic block diagram showing a configuration of a management system according to a first embodiment. 
     A management system  1  includes a target device  10 , a plurality of measurement instruments  20 , a communication device  30 , and a management device  40 . 
     The target device  10  is a device to be managed by the management device  40 . Examples of the target device  10  include a gas turbine, a steam turbine, a boiler, a coal gasification furnace, and the like. In addition, the target device may be an environmental plant, a chemical plant, or a transportation system such as an aircraft. 
     The measurement instrument  20  is provided in the target device  10  and configured to measure a state quantity of the target device  10 . 
     The communication device  30  is configured to transmit a measurement value of the state quantity measured by the measurement instrument  20  to the management device  40  through a network N. 
     The management device  40  is configured to manage the target device  10  based on the measurement value received from the communication device  30 . The management device  40  is an example of an information processing device. 
     &lt;Configuration of Management Device&gt; 
       FIG. 2  is a schematic block diagram showing a configuration of the management device according to the first embodiment. 
     The management device  40  includes a measurement value acquisition unit  401 , an omission detection unit  402 , a statistical model storage unit  403 , a statistics estimation unit  404 , a physical model storage unit  405 , a physical estimation unit  406 , an operation time measurement unit  407 , a weight calculation unit  408 , a specification unit  409 , a management unit  410 , a notification unit  411 , and a statistical model updating unit  412 . 
     The measurement value acquisition unit  401  is configured to receive measurement values of state quantities measured by a plurality of measurement instruments  20  from the communication device  30 . 
     The omission detection unit  402  is configured to detect a state quantity of which the value is omitted among state quantities to be processed, based on the plurality of measurement values acquired by the measurement value acquisition unit  401 . Here, the omission of a value refers to temporal or spatial omission. For example, in a case where the management unit  410  manages a state quantity for each time Δt, the omission detection unit  402  detects the omission of a measurement value at time T+Δt when a measurement value at time T and a measurement value at time T+2Δt are acquired. Further, for example, in a case where the management unit  410  manages a state quantity for each distance Δd, the omission of measurement values at a position (0, Δd), a position (Δd, 0), a position (Δd, Δd), a position (Δd, 2Δd), and a position (2Δd, Δd) is detected when measurement values at a position (0, 0), a position (2Δd, 0), a position (0, 2Δd), and a position (2Δd, 2Δd) are acquired. 
     The statistical model storage unit  403  is configured to store a statistical model to be used to execute estimation by the statistics estimation unit  404 . The statistical model is a model that statistically reproduces the movement of the target device  10  based on values of a state quantity in the past operation of the target device  10 . Measurement values acquired by the measurement value acquisition unit  401  and values specified by the specification unit  409  are stored in the statistical model storage unit  403 . The statistical model is updated based on the stored values. The accuracy of the statistical model is improved in association with the storage of values of state quantities. Examples of the statistical model include a multiple regression model, a classification tree model, a neural network model, an autoregression model, and the like. 
     The statistics estimation unit  404  is configured to estimate a value of a state quantity by applying a measurement value acquired by the measurement value acquisition unit  401  to a statistical model stored in the statistical model storage unit  403 . Hereinafter, a value of a state quantity estimated by the statistics estimation unit  404  will be referred to as a statistical estimation value. 
     The physical model storage unit  405  is configured to store a physical model to be used to execute estimation by the physical estimation unit  406 . The physical model is a model which is constructed based on design data of the target device  10  and reproduces the movement of the target device  10  using a numerical expression (for example, a thermodynamic equation) that follows the laws of nature. The accuracy of an estimation value obtained by the physical model generally decreases as the target device  10  deteriorates with time. The degree of deterioration with time is an example of an application condition of a physical model. 
     The physical estimation unit  406  estimates a value of a state quantity by applying a measurement value acquired by the measurement value acquisition unit  401  to a physical model stored in the physical model storage unit  405 . Hereinafter, a value of a state quantity estimated by the physical estimation unit  406  will be referred to as a physical estimation value. 
     The operation time measurement unit  407  is configured to monitor a measurement value acquired by the measurement value acquisition unit  401  and measure an operation time of the target device  10 . The operation time may be measured using an equivalent operation time or may be measured in real time. 
     The weight calculation unit  408  calculates weight coefficients of a statistical estimation value and a physical estimation value based on an amount changing according to deterioration of the target device  10  with time. Examples of the amount changing according to deterioration of the target device  10  with time include an operable time, the remaining life span, the efficiency of a compressor, the temperature of exhaust gas of the target device  10 , and the like. Meanwhile, in the first embodiment, the weight calculation unit  408  is configured to calculate a weight coefficient based on an operation time measured by the operation time measurement unit  407 . The weight calculation unit  408  increases a weight coefficient of a statistical estimation value and decreases a weight coefficient of a physical estimation value as an operation time becomes longer (as deterioration with time progresses further). That is, the weight coefficient of the statistical estimation value monotonously increases with respect to the degree of deterioration with time, and the weight coefficient of the physical estimation value monotonously decreases with respect to the degree of deterioration with time. 
     The specification unit  409  is configured to specify a value of a state quantity of which the omission has been detected by the omission detection unit  402 , based on a statistical estimation value and a physical estimation value related to the state quantity. Specifically, the specification unit  409  is configured to obtain a weighted average value of the statistical estimation value and the physical estimation value based on a weight coefficient calculated by the weight calculation unit  408  and specify the obtained weighted average value as a value of a state quantity of which the omission is detected by the omission detection unit  402 . 
     The management unit  410  is configured to manage the target device  10  based on a measurement value acquired by the measurement value acquisition unit  401  and a value specified by the specification unit  409 . Examples of the management of the target device  10  include monitoring regarding whether a state quantity of the target device  10  deviates from an operation allowable range, monitoring regarding whether an output of the target device  10  satisfies a target, output of a control signal to the target device  10 , and the like. 
     The notification unit  411  is configured to issue a notification to an administrator in a case where a physical estimation value and a statistical estimation value deviate from each other by a predetermined value or more. The deviation of the physical estimation value and the statistical estimation value from each other indicates that a value stored in the statistical model storage unit  403  has deviated from a value obtained from design information. That is, the notification unit  411  can notify the administrator of deterioration of the target device  10  or an abnormality of a statistical model due to storage of abnormal measurement values. 
     The statistical model updating unit  412  is configured to update a statistical model based on a value stored in the statistical model storage unit  403 . 
     &lt;Operation of Management Device&gt; 
       FIG. 3  is a flowchart showing operations of the management device according to the first embodiment. 
     When the management device  40  starts to manage the target device  10 , the measurement value acquisition unit  401  acquires a measurement value of a state quantity measured by the measurement instrument  20  from the communication device  30  (step S 1 ). In addition, the operation time measurement unit  407  measures an operation time of the target device  10  based on a measurement value acquired by the measurement value acquisition unit  401  (step S 2 ). 
     Next, the omission detection unit  402  detects the omission of a measurement value acquired by the measurement value acquisition unit  401  (step S 3 ). The statistics estimation unit  404  applies the measurement value acquired by the measurement value acquisition unit  401  to a statistical model to estimate a value of a state quantity of which the omission has been detected (step S 4 ). In addition, the physical estimation unit  406  applies the measurement value acquired by the measurement value acquisition unit  401  to a physical model to estimate a value of a state quantity of which the omission has been detected (step S 5 ). 
     Next, the notification unit  411  determines whether or not a difference between the statistical estimation value estimated by the statistics estimation unit  404  and the physical estimation value estimated by the physical estimation unit  406  is equal to or greater than a predetermined value (step S 6 ). In a case where the difference between the statistical estimation value and the physical estimation value is equal to or greater than the predetermined value (step S 6 : YES), the notification unit  411  notifies the administrator that an abnormality has occurred in the target device  10  or the statistical model (step S 7 ). 
     In a case where the difference between the statistical estimation value and the physical estimation value is less than the predetermined value (step S 6 : NO) or the notification unit  411  issues a notification to the administrator, the weight calculation unit  408  calculates weight coefficients of the statistical estimation value and the physical estimation value based on the operation time measured by the operation time measurement unit  407  (step S 8 ). Next, the specification unit  409  specifies a value of a physical quantity of which the omission has been detected by calculating a weighted average value of the statistical estimation value and the physical estimation value by using the weight coefficients calculated by the weight calculation unit  408  (step S 9 ). In addition, the management unit  410  manages the target device  10  based on the measurement value acquired by the measurement value acquisition unit  401  and the value specified by the specification unit  409  (step S 10 ). In a case where the target device  10  is a gas turbine, the target device  10  is managed based on a specified management value, for example, by changing a gas turbine output instruction value, changing the setting of an opening of an IGV, or changing a fuel flow rate. 
     In addition, the measurement value acquisition unit  401  and the specification unit  409  store values used to manage the target device  10  in the statistical model storage unit  403  (step S 11 ). In addition, the statistical model updating unit  412  updates a statistical model based on the values stored in the statistical model storage unit  403  (step S 12 ). Thereby, the statistics estimation unit  404  can estimate a value of a state quantity by using the statistical model updated at a timing of the next management. 
     &lt;Functions and Effects&gt; 
     In this manner, according to the first embodiment, the management device  40  specifies a value to be used to manage the target device  10  from a statistical estimation value and a physical estimation value based on deterioration of the target device  10  with time. Thereby, it is possible to appropriately specify a value of a state quantity to be used to manage the target device  10 . 
     Meanwhile, it is known that deterioration with time progresses further as an operation time of the target device  10  becomes longer. Therefore, as in the first embodiment, the management device  40  can appropriately specify a value of a state quantity to be used to manage the target device  10  in accordance with deterioration with time by specifying a value to be used to manage the target device  10  based on the operation time of the target device  10 . On the other hand, other embodiments are not limited thereto, and a value to be used to manage the target device  10  may be specified using other amounts changing depending on deterioration with time such as the efficiency of a compressor and the temperature of exhaust gas. 
     In addition, according to the first embodiment, the management device  40  obtains a weighted average value of a statistical estimation value and a physical estimation value using weight coefficients according to deterioration with time and sets the obtained weighted average value as a value of a state quantity to be used to manage the target device  10 . Thereby, the statistical estimation value and the physical estimation value are not suddenly switched, and the management device  40  can manage the target device  10  by using a value of a seamless state quantity. On the other hand, in other embodiments, the management device  40  may determine any one of the statistical estimation value and the physical estimation value to be used to manage the target device  10  in accordance with deterioration with time. This is equivalent to setting one of the weight coefficient of the statistical estimation value and the weight coefficient of the physical estimation value to 1 and setting the other to 0. 
     In addition, according to the first embodiment, the management device  40  issues a notification in a case where a difference between a statistical estimation value and a physical estimation value is equal to or greater than a predetermined value. Thereby, when an abnormality of a statistical model due to deterioration of the target device  10  or storage of an abnormal measurement value occurs, the management device  40  can notify the administrator of the occurrence of the abnormality. On the other hand, the management device  40  according to another embodiment may not issue a notification based on a difference between a statistical estimation value and a physical estimation value. 
     In addition, according to the first embodiment, the statistics estimation unit  404  can estimate a value of a state quantity by using a statistical model updated at a timing of the previous management at each management timing. That is, according to the first embodiment, it is possible to estimate a statistical estimation value with higher accuracy by updating not only statistical data but also a statistical model at each management timing. 
     Meanwhile, the management device  40  according to the first embodiment updates a statistical model based on values of the past state quantities, but is not limited thereto. For example, in other embodiments, the management device  40  may not update a statistical model while storing state quantities in the statistical model storage unit  403 . Also in this case, the accuracy of estimation using a statistical model may be improved by storing the values of the past state quantities. For example, it can be expected that an estimation accuracy would be improved by data-accumulation which makes an estimation value of an average value approach a true value according to the “Law of Large Numbers” or narrowing the distribution range thereof. 
     Second Embodiment 
     The management device  40  according to the first embodiment is configured to specify a value to be used to manage the target device  10  based on an operation time of the target device  10 . On the other hand, a management device  40  according to a second embodiment is configured to specify a value to be used to manage a target device  10  based on a total number (amount) of values of state quantities related to the past operation of the target device  10  which are stored in a statistical model storage unit  403 . 
     That is, a weight calculation unit  408  according to the second embodiment is configured to calculate a large weight coefficient of a statistical estimation value and calculate a small weight coefficient of a physical estimation value as a total number of values stored in the statistical model storage unit  403  increases. For example, the weight calculation unit  408  can calculate a weight coefficient of a statistical estimation value by substituting the total number of values stored in the statistical model storage unit  403  in an are tangent function. Alternatively, the weight calculation unit  408  may calculate a weight coefficient of a statistical estimation value based on a function that monotonously increases to the total number of values stored in the statistical model storage unit  403  (here, a value range is equal to or greater than 0 and equal to or less than 1) in a case where the total number of values stored in the statistical model storage unit  403  is less than a predetermined value, and may set a weight coefficient of a statistical estimation value to 1 in a case where the total number of values stored in the statistical model storage unit  403  is equal to or greater than the predetermined value. 
       FIG. 4  is a flowchart showing operations of the management device according to the second embodiment. 
     When the management device  40  starts to manage the target device  10 , the measurement value acquisition unit  401  acquires a measurement value of a state quantity measured by the measurement instrument  20  from the communication device  30  (step S 101 ). In addition, an operation time measurement unit  407  measures an operation time of the target device  10  based on a measurement value acquired by the measurement value acquisition unit  401  (step S 102 ). 
     Next, an omission detection unit  402  detects the omission of the measurement value acquired by the measurement value acquisition unit  401  (step S 103 ). A statistics estimation unit  404  applies the measurement value acquired by the measurement value acquisition unit  401  to a statistical model to estimate a value of a state quantity of which the omission is detected (step S 104 ). In addition, a physical estimation unit  406  applies the measurement value acquired by the measurement value acquisition unit  401  to a physical model to estimate a value of a state quantity of which the omission is detected (step S 105 ). 
     Next, a notification unit  411  determines whether or not a difference between a statistical estimation value estimated by the statistics estimation unit  404  and a physical estimation value estimated by the physical estimation unit  406  is equal to or greater than a predetermined value (step S 106 ). Ina case where the difference between the statistical estimation value and the physical estimation value is equal to or greater than the predetermined value (step S 106 : YES), the notification unit  411  notifies an administrator that an abnormality has occurred in the target device  10  or the statistical model (step S 107 ). 
     In a case where the difference between the statistical estimation value and the physical estimation value is less than the predetermined value (step S 106 : NO) or the notification unit  411  issues a notification to the administrator, the weight calculation unit  408  calculates weight coefficients of the statistical estimation value and the physical estimation value based on the total number of values stored in the statistical model storage unit  403  (step S 108 ). Next, the specification unit  409  specifies a value of a physical quantity of which the omission is detected by calculating a weighted average value of the statistical estimation value and the physical estimation value by using the weight coefficients calculated by the weight calculation unit  408  (step S 109 ). In addition, the management unit  410  manages the target device  10  based on the measurement value acquired by the measurement value acquisition unit  401  and the value specified by the specification unit  409  (step S 110 ). In addition, the measurement value acquisition unit  401  and the specification unit  409  stores values used to manage the target device  10  in the statistical model storage unit  403  (step S 111 ). In addition, the statistical model updating unit  412  updates a statistical model based on the values stored in the statistical model storage unit  403  (step S 112 ). 
     As described above, a total number of values stored in the statistical model storage unit  403 , that is, the amount of values of the past state quantities increases as an operation time of the target device  10  becomes longer. That is, the total number of values stored in the statistical model storage unit  403  is a value that changes depending on deterioration with time. Therefore, the management device  40  according to the second embodiment can appropriately specify a value of a state quantity to be used to manage the target device  10  in accordance with deterioration with time by specifying a value to be used to manage the target device  10  based on the amount of values of the past state quantities. 
     Meanwhile, according to the second embodiment, the management device  40  obtains a weighted average value of a statistical estimation value and a physical estimation value by using weight coefficients corresponding to the total number of values stored in the statistical model storage unit  403  and sets the obtained weighted average value to be a value of a state quantity to be used to manage the target device  10 , but is not limited thereto. For example, in other embodiments, the management device  40  may determine any one of the statistical estimation value and the physical estimation value to be used to manage the target device  10  in accordance with the total number of values stored in the statistical model storage unit  403 . 
     Other Embodiments 
     Although an embodiment has been described above in detail with reference to the accompanying drawing, a specific configuration is not limited to the above-described configurations, and various modification can be made. 
     For example, the management device  40  in the management system  1  according to the above-described embodiment has a function of extracting and specifying a value to be used to manage the target device  10 , but is not limited thereto. For example, in the management systems  1  according to the other embodiments, an information processing device configured to extract and specify a value to be used to manage the target device  10  may be provided separately from the management device  40 , and the management device  40  may be configured to manage the target device  10  using the value specified by the information processing device. 
     In addition, for example, the management device  40  according to the above-described embodiment acquires a measurement value through the network N, but is not limited thereto. For example, the management devices according to the other embodiments may directly acquire a measurement value from the measurement instrument  20 . In this case, the management system  1  may not include the communication device  30 . 
     In addition, according to the above-described embodiments, the management device  40  obtains a value of which the omission is detected through estimation, but is not limited thereto. For example, in other embodiments, the management device  40  may obtain a value of a state quantity through estimation regardless of the presence or absence of omission and may specify a value to be used to manage the target device  10  by using a weighted average of a measurement value and an estimation value or selecting either of them. 
     In addition, according to the above-described embodiments, the management device  40  obtains a weighted average of one statistical estimation value and one physical estimation value or selects either of them, but is not limited thereto. For example, in other embodiments, the management device  40  may generate a plurality of statistical estimation values related to one state quantity from a plurality of statistical models or may generate a plurality of physical estimation values related to one state quantity from a plurality of physical models. In this case, the management device  40  specifies a value to be used to manage the target device  10  among a plurality of statistical estimation values and a plurality of physical estimation values in accordance with deterioration of the target device  10  with time. 
     Further, in other embodiments, the management device  40  may specify a value to be used to manage the target device  10  based on application conditions of a physical model. For example, in a case where the physical model is a model having application conditions that the outside air temperature is X degrees Celsius and having a load of approximately 100%, a value to be used to manage the target device  10  may be specified by using a weighted average of weights based on the degree of similarity between the actual environment and the application conditions or by selecting either of them. 
     In addition, according to the above-described embodiments, in the management device  40 , the measurement value acquisition unit  401  and the specification unit  409  store values used to manage the target device  10  in the statistical model storage unit  403 , but is not limited thereto. For example, in other embodiments, the values may be stored in an external database of the management device  40 . 
       FIG. 5  is a schematic block diagram showing a configuration of a computer according to at least one embodiment. 
     A computer  90  includes a CPU  91 , a main storage device  92 , an auxiliary storage device  93 , and an interface  94 . 
     The management device  40  mentioned above is mounted on the computer  90 . In addition, operations of the above-described processing units are stored in the auxiliary storage device  93  in a format of a program. The CPU  91  reads out a program from the auxiliary storage device  93 , develops the program in the main storage device  92 , and executes the above-described processing in accordance with the program. In addition, the CPU  91  secures a storage area corresponding to the above-described statistical model storage unit  403  and physical model storage unit  405  in the main storage device  92  in accordance with a program. 
     Examples of the auxiliary storage device  93  include a hard disk drive (HDD), a solid state drive (SSD), a magnetic disc, a magneto-optical disc, a compact disc read only memory (CD-ROM), a digital versatile disc read only memory (DVD-ROM), a semiconductor memory, and the like. The auxiliary storage device  93  may be an internal medium directly connected to a bus of the computer  90  or may be an external medium connected to the computer  90  through the interface  94  or a communication line. Further, in a case where the program is distributed to the computer  90  through a communication line, the computer  90  having the program distributed thereto may be developed in the main storage device  92  and may execute the above-described processing. In at least one embodiment, the auxiliary storage device  93  is a non-transitory tangible medium. 
     In addition, the program may be a program that realizes some of the above-described functions. Further, the program may be a so-called differential file (differential program) that realizes the above-described functions by a combination with other programs stored in the auxiliary storage device  93  in advance. 
     INDUSTRIAL APPLICABILITY 
     The information processing device according to the present invention specifies a value to be used to manage a target device from an estimation value of a statistical model and an estimation value of a physical model based on deterioration of a target device with time. Thereby, it is possible to appropriately specify a value of a state quantity to be used to manage the target device. 
     DESCRIPTION OF REFERENCE NUMERALS 
     
         
         
           
               1  Management system 
               10  Target device 
               20  Measurement instrument 
               30  Communication device 
               40  Management device (information processing device) 
               401  Measurement value acquisition unit 
               402  Omission detection unit 
               403  Statistical model storage unit 
               404  Statistics estimation unit 
               405  Physical model storage unit 
               406  Physical estimation unit 
               407  Operation time measurement unit 
               408  Weight calculation unit 
               409  Specification unit 
               410  Management unit 
               411  Notification unit 
               412  Statistical model updating unit