Carbon dioxide emission amount calculation system, its method, and its program

Abstract

To provide a carbon dioxide emission calculation system, its method, and its program capable of determining a relationship between an amount of increase or decrease in a difference (total amount difference) between an amount of CO2 emission relating to an entire factory during a predetermined period (a total amount of CO2 emission relating to an entire factory during the period) and the amount of CO2 emission relating to an entire product completed during the period (a total amount of CO2 emission relating to the entire product during the period), and the amount of increase or decrease in a difference between a beginning inventory amount and an ending inventory amount during the period (an ending inventory amount difference), and the amount of CO2 emission relating to the ending inventory amount difference (an ending work-in-progress inventory amount of CO2 emission).SOLUTION: The present invention generates a total amount difference model representing the relationship between the total amount difference and an ending inventory amount difference, based on a pre-prepared total amount of CO2 emission of a factory in each period, the total amount of CO2 emission of a product in each period, and the ending inventory amount, and determines an ending work-in-progress inventory amount of CO2 emission by determining an inventory amount difference contribution ratio of the CO2 emission amount, which is a ratio at which the ending inventory amount difference in the CO2 emission amount contributes to the total amount difference.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a carbon dioxide emission calculation system, a carbon dioxide emission calculation method, and a carbon dioxide emission calculation program for calculating the amount of carbon dioxide emission. [Background technology]

[0002] In recent years, from the viewpoint of preserving the global environment, carbon dioxide emissions (CO2 emissions) have attracted attention, and technologies relating to such carbon dioxide emissions have been researched and developed (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-191832 A (Patent No. 5097728 A) Summary of the Invention [Problem to be solved by the invention]

[0004] When calculating CO2 emissions, the CO2 emissions for the entire factory during a specified period (CO2 emissions for the entire factory during that period) and the CO2 emissions for all products completed during that specified period (CO2 emissions for all products during that period) usually do not match for the following three reasons. First, some of the manufacturing processes for products completed during that period may have started in an earlier period. Second, some of the products whose manufacturing began during that period may not have been completed (i.e., may have been completed in a later period). Third, some products may be lost during manufacturing during that period, for example, due to disposal or destruction.

[0005] In such cases, the increase or decrease in the difference (total difference) between the CO2 emissions of the entire factory for the period and the CO2 emissions of all products for the period is thought to be related to the increase or decrease in the difference between the beginning inventory amount and the ending inventory amount for the specified period (ending inventory amount difference), and it is desirable to understand this relationship and the CO2 emissions related to the ending inventory amount difference (ending work-in-process inventory CO2 emissions).

[0006] The present invention has been made in consideration of the above circumstances, and its purpose is to provide a carbon dioxide emission calculation system, a carbon dioxide emission calculation method, and a carbon dioxide emission calculation program that can determine the relationship and the ending work-in-process inventory CO2 emissions for the target period. [Means for solving the problem]

[0007] After extensive investigation, the inventors have found that the above object can be achieved by the present invention as described below. That is, a carbon dioxide emission calculation system according to one aspect of the present invention is a system for calculating CO2 emissions for each predetermined period in a factory capable of manufacturing a plurality of types of products that are manufactured through a plurality of processes, the system comprising: a basic information storage unit that stores, for each of a plurality of periods, period-wide factory CO2 emission information representing period-wide factory CO2 emission information that is the CO2 emission amount for the entire factory during that period; period-wide product CO2 emission information representing period-wide product CO2 emission information that is the CO2 emission amount for all products completed during that period; and period-ending inventory information representing period-ending inventory information that is the inventory amount of all the products at the end of that period; and a basic information storage unit that stores, for each of a plurality of periods, the period-wide factory CO2 emission information, the period-wide product CO2 emission information, and the period-ending inventory information for each of a plurality of periods stored in the basic information storage unit, The system includes a model generation unit that generates a total quantity difference model that represents the relationship between a total quantity difference, which is the difference between the CO2 emissions of the entire factory for the period and the CO2 emissions of all products for the period, and an ending inventory quantity difference, which is the difference between the ending inventory quantity in the period immediately preceding the period in question and the ending inventory quantity in the period in question; a contribution rate processing unit that calculates an inventory quantity difference contribution rate of CO2 emissions, which is the rate at which the ending inventory quantity difference in CO2 emissions contributes to the total quantity difference, based on the total quantity difference model generated by the model generation unit; and an emissions processing unit that calculates ending work-in-process inventory CO2 emissions, which are the sum of CO2 emissions related to work-in-process at the end of the target period and CO2 emissions related to work-in-process at the end of the period immediately preceding the target period (CO2 emissions related to work-in-process at the beginning of the target period), based on the inventory quantity difference contribution rate of CO2 emissions calculated by the contribution rate processing unit and the ending inventory quantity difference for the target period.

[0008] This carbon dioxide emission calculation system creates a total quantity difference model based on the consideration that the total quantity difference and the ending inventory quantity difference are related to each other, and calculates the ending work-in-process inventory CO2 emissions based on this created total quantity difference model. Therefore, the carbon dioxide emission calculation system can calculate the relationship and the ending work-in-process inventory CO2 emissions for the target period.

[0009] In another aspect, the above-mentioned carbon dioxide emission calculation system further includes an allocation processing unit that allocates the result of subtracting the end-of-period work-in-process inventory CO2 emissions calculated by the emission processing unit from the total amount difference for the target period to each type of product, calculates each allocation amount for each type of product, and allocates each of the calculated allocation amounts to each CO2 emission amount related to the product of each type of product.

[0010] Such a carbon dioxide emission calculation system allocates the subtraction result, which corresponds to the CO2 emissions due to the remaining factors excluding the difference in ending inventory quantity, to each type of product, so that it is possible to determine the CO2 emissions for a product taking into account the CO2 emissions due to the remaining factors.

[0011] In another aspect, in the carbon dioxide emission calculation system described above, the model generation unit generates the total quantity difference model by multiple regression analysis in which the total quantity difference is used as the objective variable and the ending inventory quantity difference is divided by type of work-in-progress due to the process that has been performed during the period, and the ending inventory quantity difference for each process is used as each explanatory variable.

[0012] Such a carbon dioxide emission amount calculation system generates a total amount difference model by simple regression analysis, so that the total amount difference model can be generated easily.

[0013] In another aspect, in the carbon dioxide emission calculation system described above, the model generation unit generates the total quantity difference model by multiple regression analysis using the total quantity difference as the objective variable and dividing the ending inventory quantity difference by type of work-in-progress for the period, with the ending inventory quantity difference for each work-in-progress item as each explanatory variable.

[0014] Such a carbon dioxide emission amount calculation system generates a total amount difference model by multiple regression analysis, and therefore can generate the total amount difference model more appropriately.

[0015] In another aspect, in the carbon dioxide emission calculation system described above, the model generation unit generates the total quantity difference model by multiple regression analysis using the total quantity difference as the objective variable and the ending inventory quantity difference divided by product type as the explanatory variables.

[0016] Such a carbon dioxide emission amount calculation system generates a total amount difference model by multiple regression analysis, and therefore can generate the total amount difference model more appropriately.

[0017] A carbon dioxide emission calculation method according to another aspect of the present invention is a method for calculating CO2 emissions for each predetermined period in a factory capable of manufacturing multiple types of products that are manufactured through multiple processes, the method comprising: calculating, for each of multiple periods, a total amount difference that is the difference between the total amount of CO2 emissions for the period and the total amount of CO2 emissions for the period, and a closing inventory amount that is the inventory amount of all the products at the end of the period, based on pre-prepared total amount of CO2 emissions for the entire factory for the period, which is the CO2 emissions for the entire factory for the period, CO2 emissions for all the products completed for the period, and closing inventory amount that is the inventory amount of all the products at the end of the period; and an ending inventory quantity difference, which is the difference between the ending inventory quantity for the period in question; a contribution rate processing step of calculating an inventory quantity difference contribution rate of CO2 emissions, which is the rate at which the ending inventory quantity difference in CO2 emissions contributes to the total inventory quantity difference, based on the total inventory quantity difference model generated in the model generation step; and an emissions processing step of calculating ending work-in-process inventory CO2 emissions, which is the sum of CO2 emissions related to work-in-process at the end of the target period in question and CO2 emissions related to work-in-process at the end of the period immediately preceding the target period, based on the inventory quantity difference contribution rate of CO2 emissions calculated in the contribution rate processing step and the ending inventory quantity difference for the target period.

[0018] This carbon dioxide emission calculation method creates a total quantity difference model based on the consideration that the total quantity difference and the ending inventory quantity difference are related to each other, and calculates the ending work-in-process inventory CO2 emissions based on this created total quantity difference model. Therefore, the carbon dioxide emission calculation method can calculate the relationship and the ending work-in-process inventory CO2 emissions for the target period.

[0019] Another aspect of the present invention is a carbon dioxide emission calculation program that calculates CO2 emissions for a specified period in a factory that can manufacture multiple types of products through multiple processes, and causes a computer to function as any of the carbon dioxide emission calculation systems described above.

[0020] This makes it possible to provide a carbon dioxide emission calculation program, which has the same effects as the carbon dioxide emission calculation system described above. [Effects of the Invention]

[0021] The carbon dioxide emission calculation system, carbon dioxide emission calculation method, and carbon dioxide emission calculation program according to the present invention can determine the relationship and the ending work-in-process inventory CO2 emission amount for the target period. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a diagram showing a configuration of a carbon dioxide emission amount calculation system according to an embodiment. [Figure 2] FIG. 10 is a diagram for explaining, as an example, the total factory CO 2 emissions, the total product CO 2 emissions, and the total amount difference in the current period (N period) in the first embodiment. [Figure 3] FIG. 10 is a diagram for explaining, as an example, the total factory CO 2 emissions for the period N-1 to N-4 periods, the total product CO 2 emissions for the period, and the total amount difference in the first embodiment. [Figure 4]FIG. 1 is a diagram for explaining the total CO2 emissions from the entire factory during a period and the total CO2 emissions from the entire product during a period. [Figure 5] FIG. 10 is a diagram for explaining CO2 emissions from end-of-period work-in-process inventory as an example in the first embodiment. [Figure 6] FIG. 2 is a diagram illustrating, as an example, the allocation amounts and CO2 emissions related to each product type in the first embodiment. [Figure 7] 4 is a flowchart showing the operation of the carbon dioxide emission calculation system. [Figure 8] FIG. 10 is a diagram for explaining, as an example, the total factory CO 2 emissions, the total product CO 2 emissions, and the total amount difference in the current period (N period) in the second embodiment. [Figure 9] FIG. 11 is a diagram for explaining, as an example, the total factory CO 2 emissions for the period, the total product CO 2 emissions for the period, and the total amount difference in the N-1 period to the N-4 period in the second embodiment. [Figure 10] FIG. 11 is a diagram for explaining CO2 emissions from end-of-period work-in-process inventory as an example in the second embodiment. [Figure 11] FIG. 11 is a diagram illustrating, as an example, the allocation amounts and CO2 emissions related to each product type in the second embodiment. [Figure 12] FIG. 11 is a diagram illustrating, as an example, the total factory CO 2 emissions, the total product CO 2 emissions, and the total amount difference for the current period (N period) in the third embodiment. [Figure 13] FIG. 11 is a diagram illustrating, as an example, the total factory CO 2 emissions for the period, the total product CO 2 emissions for the period, and the total amount difference in the N-1 period to the N-4 period in the third embodiment. [Figure 14] FIG. 11 is a diagram for explaining CO2 emissions from end-of-period work-in-process inventory as an example in the third embodiment. [Figure 15] FIG. 11 is a diagram illustrating, as an example, the allocation amounts and CO2 emissions related to each product type in the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, one or more embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. In addition, components with the same reference numerals in each drawing indicate the same components, and their description will be omitted as appropriate. In this specification, when referring to a general term, a reference numeral without a subscript is used, and when referring to an individual component, a reference numeral with a subscript is used.

[0024] A carbon dioxide emission calculation system according to an embodiment calculates the amount of carbon dioxide emissions (CO2 emissions) for a predetermined period in a factory (plant) capable of producing multiple types of products that are manufactured through multiple processes. The carbon dioxide emission calculation system includes a basic information storage unit, a model generation unit, a contribution rate processing unit, and an emission amount processing unit. The basic information storage unit stores, for each of a plurality of periods, total-period factory CO2 emission information representing the total period factory CO2 emissions, which is the CO2 emissions for the entire factory during that period; total-period product CO2 emission information representing the total period product CO2 emissions, which is the CO2 emissions for all products completed during that period; and ending inventory information representing the ending inventory, which is the inventory amount of all the products at the end of that period. The model generation unit generates a total quantity difference model that represents the relationship between a total quantity difference, which is the difference between the total factory CO2 emissions for a period and the total product CO2 emissions for the period, and an ending inventory difference, which is the difference between the ending inventory amount for the period immediately preceding the period, and the ending inventory amount for the period, based on the multiple pieces of total factory CO2 emission information, the multiple pieces of total product CO2 emission information, and the multiple pieces of ending inventory information for each of the multiple periods stored in the basic information storage unit.The contribution rate processing unit calculates an inventory difference contribution rate of CO2 emissions, which is the rate at which the ending inventory difference in CO2 emissions contributes to the total quantity difference, based on the total quantity difference model generated by the model generation unit. The emission processing unit calculates the CO2 emissions from the end-of-period work-in-progress inventory, which is the sum of the CO2 emissions from the end-of-period work-in-progress in the target period and the CO2 emissions from the end-of-period work-in-progress in the period one item before the target period (the CO2 emissions from the start-of-period work-in-progress in the target period), based on the inventory difference contribution rate to CO2 emissions calculated by the contribution rate processing unit and the end-of-period inventory difference in the target period.

[0025] Hereinafter, such a carbon dioxide emission calculation system, as well as a carbon dioxide emission calculation method and a carbon dioxide emission calculation program implemented therein, will be described in more detail using first to third embodiments. Here, as an example, a factory capable of producing a wide variety of rolled steel plates will be described, but the factory may be any factory as long as it is capable of producing multiple types of products manufactured through multiple processes (e.g., products manufactured from raw materials through multiple processes). The carbon dioxide emission calculation system may be configured by interconnecting an input / output terminal device that inputs and outputs data, one or more arithmetic processing devices (e.g., server devices) that perform various arithmetic processing, and one or more database devices that store (manage) various data. At least some of these input / output terminal devices, one or more arithmetic processing devices, and one or more database devices may be integrated and interconnected for communication with the remainder. However, here, the carbon dioxide emission calculation system will be described using an example of an integrated carbon dioxide emission calculation device.

[0026] First, a first embodiment will be described. FIG. 1 is a diagram showing the configuration of a carbon dioxide emission calculation system (a carbon dioxide emission calculation device, as an example) according to an embodiment. FIG. 1 also shows carbon dioxide emission calculation systems according to the first to third embodiments. FIG. 2 is a diagram for explaining, as an example, the total CO2 emissions from the entire factory for the current period (period N), the total CO2 emissions from all products for the period, and the total difference in the total amount in the first embodiment. FIG. 3 is a diagram for explaining, as an example, the total CO2 emissions from the entire factory for the period, the total CO2 emissions from all products for the period, and the total difference in the N-1 to N-4 periods in the first embodiment. FIG. 4 is a diagram for explaining the total CO2 emissions from the entire factory for the period and the total CO2 emissions from all products for the period. FIG. 4A shows the total CO2 emissions from the entire factory for the period, and FIG. 4B shows the total CO2 emissions from all products for the period. FIG. 5 is a diagram for explaining, as an example, the CO2 emissions from end-of-period work-in-process inventory according to the first embodiment. FIG. 6 is a diagram for explaining, as an example, the CO2 emissions allocated by product type and the CO2 emissions related to the product in the first embodiment.

[0027] The carbon dioxide emission calculation system (carbon dioxide emission calculation device as an example) 1000 in the embodiment includes, for example, a control processing unit 1, an input unit 2, an output unit 3, an interface unit (IF unit) 4, and a memory unit 5, as shown in FIG.

[0028] The input unit 2 is connected to the control processing unit 1 and is a device that inputs various commands, such as a command to start calculation, and various data necessary to operate the carbon dioxide emission calculation device 1000, such as information on CO2 emissions from the entire factory for a period, information on CO2 emissions from all products for a period, and information on ending inventory, to the carbon dioxide emission calculation device 1000, and is, for example, a keyboard, a mouse, or multiple input switches to which predetermined functions are assigned. The output unit 3 is connected to the control processing unit 1 and is a device that outputs the commands, data, calculation results, etc. input from the input unit 2 under the control of the control processing unit 1, and is, for example, a display device such as a CRT display, an LCD (liquid crystal display), or an organic EL display, or a printing device such as a printer.

[0029] The input unit 2 and the output unit 3 may be configured as a touch panel. In the case of configuring this touch panel, the input unit 2 is a position input device that detects and inputs an operation position, for example, a resistive film type or a capacitive type, and the output unit 3 is a display device. In this touch panel, a position input device is provided on the display surface of the display device, and one or more input content candidates that can be input to the display device are displayed on the display device. When a user touches the display position showing the input content that the user wants to input, the position is detected by the position input device, and the display content displayed at the detected position is input to the carbon dioxide emission calculation device 1000 as the user's operation input content. With such a touch panel, the user can easily intuitively understand the input operation, and therefore a carbon dioxide emission calculation device 1000 that is easy for the user to use is provided.

[0030] The IF unit 4 is connected to the control processing unit 1 and is a circuit that inputs and outputs data to and from, for example, an external device under the control of the control processing unit 1, and is, for example, an interface circuit for RS-232C, which is a serial communication method, an interface circuit using the Bluetooth (registered trademark) standard, an interface circuit using the USB standard, etc. The IF unit 4 may also be, for example, a communication interface circuit that transmits and receives communication signals to and from an external device, such as a data communication card or a communication interface circuit conforming to the IEEE802.11 standard, etc.

[0031] The storage unit 5 is connected to the control processing unit 1 and is a circuit that stores various predetermined programs and various predetermined data under the control of the control processing unit 1. In one example, the various predetermined programs are recorded on a recording medium such as a CD-R or DVD-R, and are input from the recording medium via its drive device and the IF unit 4 and stored in the storage unit 5.

[0032] The various predetermined programs include, for example, a control processing program, which includes, for example, a control program, a model generation program, a contribution rate processing program, an emission processing program, and an allocation processing program. The control program controls each of the units 2 to 5 of the carbon dioxide emission calculation device 1000 according to the function of each unit. The model generation program generates a total quantity difference model that represents the relationship between the total quantity difference, which is the difference between the total factory CO2 emissions for a period and the total product CO2 emissions for a period, and the ending inventory difference, which is the difference between the ending inventory amount for the period immediately prior to the period, and the ending inventory amount for the period, based on a plurality of pieces of total factory CO2 emissions information, a plurality of pieces of total product CO2 emissions information, and a plurality of ending inventory amount information for each period stored in the basic information storage unit 51 of the storage unit 5. The contribution rate processing program calculates the inventory difference contribution rate of CO2 emissions, which is the rate at which the ending inventory amount difference in CO2 emissions contributes to the total quantity difference, based on the total quantity difference model generated by the model generation program. The emission processing program is a program that calculates the end-of-period work-in-process inventory CO2 emissions, which is the sum of the CO2 emissions related to work-in-process at the end of the target period and the CO2 emissions related to work-in-process at the end of the period one item before the target period (the CO2 emissions related to work-in-process at the beginning of the target period), based on the inventory quantity difference contribution rate of CO2 emissions calculated by the contribution rate processing program and the end-of-period inventory difference of the target period. The allocation processing program is a program that allocates the result of subtracting the end-of-period work-in-process inventory CO2 emissions calculated by the emission processing program from the total quantity difference of the target period, calculates each allocation amount for each product type, and allocates each of the calculated allocation amounts to the CO2 emissions related to the products of each product type.

[0033] The various specified data include, for example, data necessary to execute each of these programs, such as information on CO2 emissions from the entire factory for the period, information on CO2 emissions from all products for the period, information on inventory at the end of the period, various processing results during processing, and final processing results.

[0034] The storage unit 5 includes, for example, a ROM (Read Only Memory), which is a nonvolatile storage element, and an EEPROM (Electrically Erasable Programmable Read Only Memory), which is a rewritable nonvolatile storage element. The storage unit 5 also includes a RAM (Random Access Memory), which serves as a working memory for the control processing unit 1 and stores data generated during execution of the predetermined program. The storage unit 5 may also be configured with a hard disk drive or solid state drive (SSD) with a relatively large storage capacity.

[0035] The storage unit 5 functionally includes a basic information storage unit 51 for storing information on CO2 emissions from the entire factory during a period, information on CO2 emissions from the entire product during a period, and information on end-of-period inventory.

[0036] The basic information storage unit 51 stores period-wide factory CO2 emission information, period-wide product CO2 emission information, and period-ending inventory information. As described above, the period-wide factory CO2 emission information is information representing the CO2 emission amount for the entire factory during a predetermined period (period-wide factory CO2 emission amount), which is prepared (given or calculated) in advance and stored in the basic information storage unit 51. The period-wide factory CO2 emission amount is calculated, for example, by multiplying the amount of energy, such as electricity or fuel, consumed in the factory during the period for the manufacture of products by the CO2 emission amount per unit amount. The period-wide factory CO2 emission information may be expressed directly as the period-wide factory CO2 emission amount itself, or may be expressed indirectly as a predetermined value for calculating the period-wide factory CO2 emission amount. As described above, the period-wide product CO2 emission information is information representing the CO2 emission amount for all products completed during a predetermined period (period-wide product CO2 emission amount), which is prepared (given or calculated) in advance and stored in the basic information storage unit 51. The total product CO2 emissions for a period can be calculated, for example, by calculating the CO2 emissions emitted during the production of each type of product completed in a specified period (product-related CO2 emissions) and then summing the CO2 emissions calculated for each type of product. For example, if the product is produced through multiple processes, the product-related CO2 emissions can be calculated by multiplying the amount of energy, such as electricity or fuel, consumed in the multiple processes by the CO2 emissions per unit amount and then summing the CO2 emissions calculated for each process. If the product is produced through multiple processes from raw materials, the product-related CO2 emissions can include the CO2 emissions related to the raw materials (CO2 emissions emitted during the production of the raw materials). The total product CO2 emissions information for a period can be directly expressed as the value of the total product CO2 emissions for the period itself, or indirectly expressed as a predetermined value for calculating the total product CO2 emissions for the period. As described above, the end-of-period inventory information is information that represents the total inventory quantity of products at the end of a specified period (for example, the sum of the inventory quantities of each product type), and is prepared (given, calculated) in advance and stored in the basic information memory unit 51.The ending inventory information may be directly expressed by the value of the ending inventory itself, or may be indirectly expressed by a predetermined value for determining the ending inventory.

[0037] In order to generate a total quantity difference model, the period-wide factory CO2 emission information (period-wide factory CO2 emission), period-wide product CO2 emission information (period-wide product CO2 emission), and period-ending inventory information (period-ending inventory) are prepared in advance for each of a plurality of periods and associated with each of the plurality of periods and stored in advance in the basic information storage unit 51 before the start of calculation of CO2 emissions. Each piece of information (each CO2 emission amount) may be input from the input unit 2, may be input via the IF unit 4 from a storage medium (e.g., a USB memory or an SD card (registered trademark)) that stores each piece of information (each CO2 emission amount), or may be input via the drive device and the IF unit 4 from a storage medium (e.g., a CD-R or a DVD-R) that records each piece of information (each CO2 emission amount), or may be input from a management server device that manages each piece of information (each CO2 emission amount) via a communication network and the IF unit 4.

[0038] For example, when determining the above relationship and the CO2 emissions from the end-of-period work-in-process inventory in an actual factory, the CO2 emissions from the entire factory for the period, the CO2 emissions from the entire finished product for the period, and the end-of-period inventory amount may be past actual values ​​from the actual factory, or, for example, in the case of a simulation (numerical experiment, numerical prediction), the CO2 emissions from the entire factory for the period, the CO2 emissions from the entire finished product for the period, and the end-of-period inventory amount may be estimated values.

[0039] The control processing unit 1 is a circuit for controlling each of the units 2 to 5 of the carbon dioxide emission calculation device 1000 in accordance with the function of each unit, and for calculating the amount of CO2 emission. The control processing unit 1 is configured to include, for example, a CPU (Central Processing Unit) and its peripheral circuits. When the control processing program is executed, the control processing unit 1 is functionally configured to include a control unit 11, a model generation unit 12, a contribution rate processing unit 13, an emission processing unit 14, and an allocation processing unit 15.

[0040] The control unit 11 controls each of the units 2 to 5 of the carbon dioxide emission calculation device 1000 according to the function of each unit, and is in charge of overall control of the carbon dioxide emission calculation device 1000.

[0041] The model generation unit 12 generates a total quantity difference model that represents the relationship between the total quantity difference, which is the difference between the total factory CO2 emissions for the period and the total product CO2 emissions for the period, and the final inventory quantity difference, which is the difference between the final inventory quantity for the period immediately preceding the period and the final inventory quantity for the period, based on multiple pieces of information on CO2 emissions for the entire factory for the period, multiple pieces of CO2 emissions for the entire product for the period, and multiple pieces of information on final inventory quantities for the period.

[0042] For example, as shown in FIG. 4A, the total CO2 emissions from the entire factory for a period are the CO2 emissions A related to the entire factory from the beginning of the period (April 1 in FIG. 4) to the end of the period (September 30 in FIG. 4). On the other hand, the total CO2 emissions from all products for a period are the CO2 emissions B related to all products completed between the beginning and end of the period, as shown in FIG. 4B. These figures do not usually match for the first to third reasons mentioned above. In particular, the total CO2 emissions from all products for a period include the CO2 emissions of products whose production started before the period in question (April 1 to September 30 in FIG. 4) and whose production was completed during that period (the period before April 1, indicated by the hatched line going up to the left in FIG. 4B; the dashed line indicates the progress of the process), but do not include the CO2 emissions of products whose production started during that period but whose production was not completed during that period (the period before September 30, indicated by the unhatched line in FIG. 4B; the dashed line indicates the progress of the process). Therefore, it is inferred that the increase or decrease in the total quantity difference, which is the difference between the total factory CO2 emissions for a period and the total product CO2 emissions for a period, is related to the increase or decrease in the ending inventory quantity difference, which is the difference between the beginning inventory and the ending inventory for the specified period. Based on this inference, the model generation unit 12 generates a total quantity difference model. More specifically, for each of a plurality of periods, the model generation unit 12 first calculates the total quantity difference for that period from the total factory CO2 emissions information for that period and the total product CO2 emissions information for that period. For each of the plurality of periods, the model generation unit 12 calculates the ending inventory quantity difference for that period from the ending inventory quantity information for that period and the ending inventory quantity information for the period immediately preceding that period. Then, a total quantity difference model is generated from each total quantity difference and each ending inventory quantity difference for each of the plurality of periods. More specifically, in the first embodiment, the model generation unit 12 generates the total quantity difference model by simple regression analysis using the total quantity difference as the objective variable X and the ending inventory quantity difference as the explanatory variable Y.

[0043] For example, if the target period is the current period (period N), and the periods for determining the total quantity difference model are period N-1, one period before the current period, period N-2, two periods before the current period, period N-3, three periods before the current period, and period N-4, four periods before the current period, and the ending inventory amount, CO2 emissions from the entire factory for the period, and CO2 emissions from the entire product for the period are the values ​​shown in Figure 2, and the ending inventory amount, CO2 emissions from the entire factory for the period, and CO2 emissions from the entire product for the period are the values ​​shown in Figure 3 for periods N-4 and N-1, respectively, and the total quantity difference model is the linear function Y=αX+β, then the following will be calculated as shown in Figure 3. From the values ​​for N-4 and N-1, the total difference Y for N-4 and N-1, respectively, is 10 tCO2, -140 tCO2, 150 tCO2, and -110 tCO2, and the ending inventory difference X for N-4 and N-1, respectively, is 0 ton, -5 ton, 5 ton, and -4 ton. Therefore, a simple regression analysis yields a regression coefficient α = 29.03 (rounded to two decimal places; however, the unrounded figures are used in the calculations; the same applies below), and a constant term β = 6.53. In addition to showing ending inventory, total factory CO2 emissions for the period, and total product CO2 emissions for the period, Figure 2 also shows product volume by product type, ending inventory difference, CO2 emissions by product type, and total amount difference. In addition to illustrating the ending inventory amount, CO2 emissions from the entire factory during the period, and CO2 emissions from all products during the period, Figure 3 also illustrates the product amount, ending inventory amount difference, and total amount difference.

[0044] The contribution rate processing unit 13 calculates an inventory quantity difference contribution rate of CO2 emissions, which is the rate at which the ending inventory quantity difference contributes to the total quantity difference in CO2 emissions, based on the total quantity difference model generated by the model generation unit 12. In the first embodiment, the model generation unit 12 generates the total quantity difference model by simple regression analysis, so the contribution rate processing unit 13 calculates the regression coefficient α as the inventory quantity difference contribution rate of CO2 emissions. Note that the constant term β is the rate at which remaining factors (other factors) excluding the ending inventory quantity difference contribute to the total quantity difference in CO2 emissions (other contribution rate) among all factors (including factors unknown to the user) that affect the total quantity difference in CO2 emissions.

[0045] The emission processing unit 14 calculates the end-of-period work-in-process inventory CO2 emissions, which is the sum of the CO2 emissions related to the work-in-process at the end of the target period and the CO2 emissions related to the work-in-process at the end of the period immediately preceding the target period (the CO2 emissions related to the work-in-process at the beginning of the target period), based on the inventory difference contribution rate of CO2 emissions calculated by the contribution rate processing unit 13 and the end-of-period inventory difference of the target period. In this embodiment, the emission processing unit 14 calculates the end-of-period work-in-process inventory CO2 emissions by multiplying the end-of-period inventory difference of the target period by the inventory difference contribution rate of CO2 emissions calculated by the contribution rate processing unit 13.

[0046] For example, in the example shown in Figures 2 and 3, as shown in Figure 5, by subtracting the ending inventory quantity in the N-1 period, which is one period before the N period of the target period, of 6 [ton] from the ending inventory quantity in the N period of the target period, of 1 [ton], the ending inventory quantity difference in the N period of the target period, of -5 [ton], is obtained, and by multiplying this ending inventory quantity difference in the N period of the target period, of -5 [ton], by the inventory quantity difference contribution rate α = 29.03 of CO2 emissions, the ending work-in-process inventory CO2 emissions in the N period of the target period, of -145.16 [tCO2], is obtained.

[0047] Figure 5 also shows CO2 emissions related to the other factors (other CO2 emissions). The constant term β in the simple regression analysis corresponds to the other CO2 emissions, but since this is the value of the total quantity difference model, the constant term β = 6.53 is an expected value. Therefore, in Figure 5, by subtracting the ending work-in-process inventory CO2 emissions αX = -145.16 from the total quantity difference Y = -132.55, the other CO2 emissions of 12.61 [tCO2] is obtained, which is considered to be more appropriate than the expected value.

[0048] The allocation processing unit 15 allocates the result of subtracting the end-of-period work-in-process inventory CO2 emissions calculated by the emission processing unit 14 from the total amount difference for the target period to each product type, thereby calculating an allocation amount for each product type and allocating each of the calculated allocation amounts to each CO2 emission amount for each product type. More specifically, the allocation processing unit 15 calculates an allocation amount for each product type based on the subtraction result in the ratio of the product quantity for each product type, and allocates each of the calculated allocation amounts to each CO2 emission amount for each product type. For this reason, in this embodiment, the basic information storage unit 51 pre-stores the product quantity and product-related CO2 emissions (product quantity by product type and emission amount by product type) for each product type at least for the target period. Of course, the product quantity by product type and emission amount by product type may also be pre-stored in the basic information storage unit 51 for each period.

[0049] For example, in the example shown in Figures 2 and 3, the subtraction result (the other CO2 emissions) is 12.61 [tCO2], and in period N of the target period, three products, first to third types, are produced, and for the first type of product, the product volume by product type is 800 [tons] and the emissions by product type is 1189.63 [tCO2], for the second type of product, the product volume by product type is 300 [tons] and the emissions by product type is 673.08 [tCO2], and for the third type of product, the product volume by product type is 400 [tons] and the emissions by product type is 901.84 [tCO2]. Therefore, as shown in Figure 6, for the first type of product, the product volume ratio is 0.53, the allocated volume is 6.73 tCO2, and the CO2 emissions for each product type after allocation are 1196.36 tCO2. For the second type of product, the product volume ratio is 0.2, the allocated volume is 2.52 tCO2, and the CO2 emissions for each product type after allocation are 675.60 tCO2. For the third type of product, the product volume ratio is 0.27, the allocated volume is 3.36 tCO2, and the CO2 emissions for each product type after allocation are 905.20 tCO2.

[0050] The control processing unit 1, input unit 2, output unit 3, IF unit 4 and storage unit 5 in the carbon dioxide emission calculation device 1000, which is an example of a carbon dioxide emission calculation system, can be configured by, for example, a desktop computer, a notebook computer, etc. Of course, as described above, the carbon dioxide emission calculation system may be configured by a plurality of computers connected to each other so that they can communicate with each other.

[0051] Next, the operation of this embodiment will be described. Fig. 7 is a flowchart showing the operation of the carbon dioxide emission calculation system (one example of which is a carbon dioxide emission calculation device). Fig. 7 shows a flowchart of the carbon dioxide emission calculation system in the first to third embodiments.

[0052] When the carbon dioxide emission calculation device 1000 having such a configuration is powered on, it initializes the necessary parts and starts operation. By executing the control processing program, the control processing unit 1 is functionally configured to include a control unit 11, a model generation unit 12, a contribution rate processing unit 13, an emission processing unit 14, and an allocation processing unit 15.

[0053] In Figure 7, the carbon dioxide emission calculation device 1000 first generates, by the model generation unit 12 of the control processing unit 1, a total quantity difference model that represents the relationship between the total quantity difference and the ending inventory quantity difference, based on multiple pieces of period-wide factory CO2 emission information, multiple pieces of period-wide product CO2 emission information, and multiple pieces of period-wide inventory quantity information for each of multiple periods stored in the basic information storage unit 51 of the storage unit 5 (S1).

[0054] Next, the carbon dioxide emission calculation device 1000 calculates the inventory difference contribution rate of CO2 emissions using the contribution rate processing unit 13 of the control processing unit 1 based on the total amount difference model generated by the model generation unit 12 in the process S1 (S2).

[0055] Next, the carbon dioxide emission calculation device 1000 calculates the CO2 emission amount in the end-of-period work-in-process inventory based on the inventory difference contribution rate of CO2 emissions calculated by the contribution rate processing unit 13 in process S2 and the end-of-period inventory difference for the target period (S3).

[0056] Next, the carbon dioxide emission calculation device 1000 uses the allocation processing unit 15 of the control processing unit 1 to calculate each allocation amount for each type of product based on the result of subtracting the CO2 emissions of the end-of-period work-in-process inventory calculated by the emissions processing unit 14 in process S3 from the total amount difference for the target period, and allocates each of these calculated allocation amounts to the CO2 emissions related to each product of each type of product (S4).

[0057] Then, the carbon dioxide emission calculation device 1000 causes the control unit 11 of the control processing unit 1 to output the results of each process, such as the CO2 emissions from the end-of-period work-in-process inventory for the target period, other CO2 emissions, and the CO2 emissions for each product type after allocation, from the output unit 3 (S5), and ends this process. Note that the control unit 11 may output the results of each process to an external device via the IF unit 4 as necessary.

[0058] As explained above, the carbon dioxide emission calculation system (one example of a carbon dioxide emission calculation device) 1000 in the embodiment, and the carbon dioxide emission calculation method and carbon dioxide emission calculation program implemented therein, create a total amount difference model based on the consideration that the total amount difference and the ending inventory amount difference are related to each other, and calculate the ending work-in-process inventory CO2 emissions based on this created total amount difference model. Therefore, the carbon dioxide emission calculation system (carbon dioxide emission calculation device) S, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can calculate the relationship and the ending work-in-process inventory CO2 emissions for the target period.

[0059] Therefore, the carbon dioxide emission calculation system (carbon dioxide emission calculation device) S, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can provide detailed breakdowns of the total CO2 emissions from the entire factory for the period as the CO2 emissions to be listed in an environmental report that a company publishes to investors, and the total CO2 emissions from the entire product for the period as the CO2 emissions related to the product that will be presented to customers.

[0060] The carbon dioxide emission calculation system (carbon dioxide emission calculation device) S, carbon dioxide emission calculation method, and carbon dioxide emission calculation program allocate the subtraction result, which corresponds to the CO2 emission due to the remaining factors excluding the end-of-period inventory difference, to each type of product, so that it is possible to determine the CO2 emission for a product taking into account the CO2 emission due to the remaining factors.

[0061] The carbon dioxide emission amount calculation system (carbon dioxide emission amount calculation device) S, the carbon dioxide emission amount calculation method, and the carbon dioxide emission amount calculation program generate a total amount difference model by simple regression analysis, so that the total amount difference model can be generated easily.

[0062] Next, a second embodiment will be described. In the first embodiment, the model generation unit 12 generates the total amount difference model by simple regression analysis in which the total amount difference is the response variable Y and the ending inventory amount difference is the explanatory variable X, but in the second embodiment, the model generation unit 12 generates the total amount difference model by multiple regression analysis in which the total amount difference is the response variable Y and the ending inventory amount difference by type of work-in-process due to the process that has been performed in the period is used as each explanatory variable X1, X2, ... For example, if a product is manufactured through five processes, A, B, C, D, and E, the types of work-in-progress that have been completed in a given period are: first work-in-progress that has only completed process E (first work-in-progress that has completed processes A, B, C, and D in the previous period); second work-in-progress that has completed processes D and E (second work-in-progress that has completed processes A, B, and C in the previous period); third work-in-progress that has completed processes C, D, and E. The number of work-in-progress is eight, for example, the third work-in-progress for which processes A and B were performed in the previous period (the third work-in-progress for which processes B, C, D, and E were performed in the previous period), the fourth work-in-progress for which processes B, C, D, and E were performed in the previous period (the fourth work-in-progress for which only process A was performed in the previous period), the fifth work-in-progress for which only process A was performed, the sixth work-in-progress for which processes A and B were performed, the seventh work-in-progress for which processes A, B, and C were performed, and the eighth work-in-progress for which processes A, B, C, and D were performed. The first through fourth work-in-progress are each work-in-progress categorized by type of process that has been performed at the beginning of the specified period, and the fifth through eighth work-in-progress are each work-in-progress categorized by type of process that has been performed at the end of the specified period.

[0063] For example, to simplify the explanation, a specific example will be described in which there are two types of work-in-progress resulting from processes that have been completed in a given period (for example, when a product is manufactured through three processes, namely, process A, process B, and process C, and there is a first work-in-progress product that has undergone only process C and a second work-in-progress product that has undergone only process A). FIG. 8 is a diagram illustrating, as an example, the total CO2 emissions from the entire factory, the total CO2 emissions from all products during the period, and the difference in total amount for the current period (period N) in the second embodiment. FIG. 9 is a diagram illustrating, as an example, the total CO2 emissions from the entire factory, the total CO2 emissions from all products during the period, and the difference in total amount for periods N-1 to N-4 in the second embodiment. FIG. 10 is a diagram illustrating, as an example, the CO2 emissions from work-in-progress inventory at the end of the period in the second embodiment. FIG. 11 is a diagram illustrating, as an example, the CO2 emissions allocated by product type and the CO2 emissions related to the products in the second embodiment.

[0064] In the examples shown in FIGS. 8 and 9, the current period (N period) is the target period, and periods N-4 to N-1 are the multiple periods for obtaining the total quantity difference model. The first period end inventory amount of the first work-in-progress, the second period end inventory amount of the second work-in-progress, the period-wide factory CO2 emissions, and the period-wide product CO2 emissions are the values ​​shown in FIG. 8. The first period end inventory amount, the second period end inventory amount, the period-wide factory CO2 emissions, and the period-wide product CO2 emissions are the values ​​shown in FIG. 9 for each of periods N-4 to N-1. If the total quantity difference model is a linear first-degree polynomial Y=α1X1+α2X2+β, then the total quantity difference Y for each of periods N-4 to N-1 can be calculated from each value for periods N-4 to N-1 shown in FIG. 9, in order. The ending inventory quantity difference by work in progress for each of the first processes in periods N-4 and N-1 (increase or decrease in inventory quantity at the end of the first period) X1 is 1 [ton], -3 [ton], 3 [ton] and -1 [ton], respectively, and the ending inventory quantity difference by work in progress for each of the second processes in periods N-4 and N-1 (increase or decrease in inventory quantity at the end of the second period) X2 is -1 [ton], -2 [ton], 2 [ton] and -3 [ton], respectively. Therefore, the first regression coefficient of the ending inventory quantity difference by work in progress for each of the first processes X1 is 30, the second regression coefficient of the ending inventory quantity difference by work in progress for each of the second processes X2 is 27.86, and the constant term β is 5.36. In addition to illustrating the first and second period-ending inventory amounts, CO2 emissions from the entire factory, and CO2 emissions from all products during the period, Figure 8 also illustrates the product amount by product type, the difference in ending inventory amounts for work-in-progress in the first and second processes, CO2 emissions by product type, and the total amount difference.In addition to illustrating the first and second period-ending inventory amounts, CO2 emissions from the entire factory during the period, and CO2 emissions from all products during the period, Figure 9 also illustrates the product amount, the difference in ending inventory amounts for work-in-progress in the first and second processes, and the total amount difference.

[0065] In this example, the contribution rate processing unit 13 determines the first and second regression coefficients α1 and α2 as the inventory difference contribution rates of the CO2 emissions.

[0066] In this example, as shown in FIG. 10, the emission processing unit 14 subtracts the first end inventory amount in the N-1 period, which is one unit before the N period of the target period; 5 [ton], from the first end inventory amount in the N period of the target period; 1 [ton], to obtain the end inventory amount difference by first process work-in-progress in the N period of the target period; -4 [ton], and subtracts the second end inventory amount in the N-1 period; 1 [ton] from the second end inventory amount in the N period; 0 [ton], to obtain the end inventory amount difference by first process work-in-progress in the N period. The difference in ending inventory quantity by work-in-progress for the first process in period N; -1 [ton] is calculated, and this calculated difference in ending inventory quantity by work-in-progress for the first process in period N; -4 [ton] is multiplied by the contribution rate of CO2 emissions to the first inventory difference α1 = 30, and the calculated difference in ending inventory quantity by work-in-progress for the second process in period N; -1 [ton] is multiplied by the contribution rate of CO2 emissions to the second inventory difference α2 = 27.86, and the sum of these multiplication results is calculated to determine the CO2 emissions from ending work-in-progress inventory for period N of the target period; -147.86 [tCO2].

[0067] In this example, three products (types 1 to 3) are produced in period N of the target period, similar to the examples shown in Figures 2 and 3 above. The product quantities and emissions for each product type for each type of product are the same as those shown in Figures 2 and 3 above. The ratios of product quantities for each type of product are the same as those shown in Figure 6 above, as shown in Figure 11 . The subtraction result (other CO2 emissions) is 15.31 tCO2. As shown in Figure 11, the allocated amount for the first type of product is 8.16 tCO2, and the CO2 emissions for each product type after the allocation are 1197.79 tCO2. The allocated amount for the second type of product is 3.06 tCO2, and the CO2 emissions for each product type after the allocation are 676.14 tCO2. The allocation amount for the third type of product is 4.08 [tCO2], and the CO2 emissions for each product type after allocation is 905.92 [tCO2].

[0068] The carbon dioxide emission calculation system (carbon dioxide emission calculation device) S, the carbon dioxide emission calculation method, and the carbon dioxide emission calculation program in the second embodiment generate a total amount difference model by multiple regression analysis, and therefore can generate the total amount difference model more appropriately.

[0069] Next, a third embodiment will be described. In contrast to the first embodiment, in the third embodiment, the model generation unit 12 generates the total quantity difference model by multiple regression analysis in which the total quantity difference is set as a response variable Y, the ending inventory quantity differences are divided by product type, and the ending inventory quantity differences by type are set as explanatory variables X1, X2, . . .

[0070] For example, to simplify the explanation, a specific description will be given of a case where there are two types (varieties) of products. FIG. 12 is a diagram illustrating, as an example, the period-wide factory CO2 emissions, the period-wide product CO2 emissions, and the total amount difference for the current period (period N) in the third embodiment. FIG. 13 is a diagram illustrating, as an example, the period-wide factory CO2 emissions, the period-wide product CO2 emissions, and the total amount difference for periods N-1 to N-4 in the third embodiment. FIG. 14 is a diagram illustrating, as an example, the end-of-period work-in-process inventory CO2 emissions in the third embodiment. FIG. 15 is a diagram illustrating, as an example, the allocation amount and product-related CO2 emissions by product type in the third embodiment.

[0071] In the examples shown in Figures 12 and 13, the current period (period N) is the target period, and periods N-4 to N-1 are the multiple periods for obtaining the total quantity difference model. The first period end inventory amount for the first type of product, the second period end inventory amount for the second type of product, the period-wide factory CO2 emissions, and the period-wide product CO2 emissions are the values ​​shown in Figure 12. The first period end inventory amount, the second period end inventory amount, the period-wide factory CO2 emissions, and the period-wide product CO2 emissions are the values ​​shown in Figure 13 for each of periods N-4 to N-1. If the total quantity difference model is a linear first-degree polynomial Y = α1X1 + α2X2 + β, then the N-4 period to N-1 period can be calculated from each value for periods N-4 to N-1 shown in Figure 13. The respective total quantity differences Y are 10 [tCO2], -140 [tCO2], 150 [tCO2] and -110 [tCO2], respectively, the first type ending inventory quantity difference (increase / decrease in first period ending inventory quantity) X1 for periods N-4 and N-1, respectively, are 2 [ton], 0 [ton], 2 [ton] and -1 [ton], and the second type ending inventory quantity difference (increase / decrease in second period ending inventory quantity) X2 for periods N-4 and N-1, respectively, are -1 [ton], -5 [ton], 3 [ton] and -3 [ton], respectively. Therefore, the first regression coefficient α1 of the first type ending inventory quantity difference X1 is 19.80, the second regression coefficient α2 of the second type ending inventory quantity difference X2 is 31.63 and the constant term β is 10.10. In addition to illustrating the first and second ending inventory amounts, CO2 emissions from the entire factory, and CO2 emissions from all products for the period, Figure 12 also illustrates the product amounts by product type, the difference between the ending inventory amounts by first and second type, CO2 emissions by product type, and the difference in the total amount.In addition to illustrating the first and second ending inventory amounts, CO2 emissions from the entire factory, and CO2 emissions from all products for the period, Figure 13 also illustrates the product amounts, the difference between the ending inventory amounts by first and second type, and the difference in the total amount.

[0072] In this example, the contribution rate processing unit 13 determines the first and second regression coefficients α1 and α2 as the inventory difference contribution rates of the CO2 emissions.

[0073] In this example, as shown in FIG. 14 , the emission processing unit 14 subtracts the first ending inventory amount in the N-1 period, which is one item before the N period of the target period; 3 [ton], from the first ending inventory amount in the N period of the target period; 1 [ton], to obtain the first type ending inventory amount difference in the N period of the target period; -2 [ton], and subtracts the second ending inventory amount in the N-1 period; 3 [ton] from the second ending inventory amount in the N period; 0 [ton], to obtain the second type ending inventory amount difference in the N period of the target period; The difference in ending inventory quantity by type; -3 [tons] is calculated, and this calculated difference in ending inventory quantity by first type in period N; -2 [tons] is multiplied by the contribution rate of CO2 emissions to the first inventory quantity difference α1 = 19.80, and the calculated difference in ending inventory quantity by second type in period N; -3 [tons] is multiplied by the contribution rate of CO2 emissions to the second inventory quantity difference α2 = 31.63, and the sum of these multiplication results is calculated to determine the ending work-in-process inventory CO2 emissions in period N of the target period; -134.52 [tCO2].

[0074] In this example, the subtraction result (other CO2 emissions) is 1.97 tCO2. In period N of the target period, two products, a first and a second type, are produced. For the first type of product, the product volume by product type is 800 ton, and the emissions by product type are 1189.63 tCO2. For the second type of product, the product volume by product type is 700 ton, and the emissions by product type are 1574.92 tCO2. Therefore, as shown in Figure 15, for the first type of product, the product volume ratio is 0.53, the allocated amount is 1.05 tCO2, and the CO2 emissions for each product type after the allocation are 1190.68 tCO2. For the second type of product, the product volume ratio is 0.47, the allocated volume is 0.92 [tCO2], and the CO2 emissions for each product type after allocation is 1575.84 [tCO2].

[0075] The carbon dioxide emission calculation system (carbon dioxide emission calculation device) S, the carbon dioxide emission calculation method, and the carbon dioxide emission calculation program in the third embodiment generate a total amount difference model by multiple regression analysis, so that the total amount difference model can be generated more appropriately.

[0076] In order to express the present invention, the present invention has been properly and sufficiently described above through the embodiments with reference to the drawings, but it should be recognized that those skilled in the art can easily change and / or improve the above-mentioned embodiments. Therefore, unless the changes or improvements made by those skilled in the art are at a level that causes departure from the scope of the claims described in the claims, such changes or improvements are interpreted as being included in the scope of the claims. [Explanation of symbols]

[0077] 1000 Carbon dioxide emission calculation system (one example of a carbon dioxide emission calculation device) 1 Control processing section 2 Input section 3 Output section 4 Interface section (IF section) 5 Storage section 11 Control section 12 Model Generation Unit 13 Contribution rate processing section 14 Emissions Processing Unit 15 Allocation Processing Section 51 Basic information storage section

Claims

1. In a factory that can manufacture multiple types of products that are manufactured through multiple processes, ２ In a carbon dioxide emission calculation system for calculating emissions for each predetermined period, For each of multiple periods, CO for the entire factory for that period ２ CO emissions from the entire factory ２ CO emissions from the entire factory ２ Emissions information, CO2 for all products completed during the period ２ Emissions of the entire product during the period ２ CO emissions for the entire product ２ a basic information storage unit that stores discharge amount information and end-of-period inventory information that indicates an end-of-period inventory amount, which is the inventory amount of the entire product at the end of the period; The basic information storage unit stores a plurality of total factory CO ２ Emission information, total CO ２ Based on the emission information and the plurality of pieces of end-of-period inventory information, the total CO ２ Emissions and total CO2 for the above period ２ a model generation unit that generates a total quantity difference model that represents the relationship between a total quantity difference, which is the difference between the discharge amount and the ending inventory amount in the period immediately preceding the period in question, and an ending inventory quantity difference, which is the difference between the ending inventory amount in the period in question and the ending inventory amount in the period immediately preceding the period in question; Based on the total amount difference model generated by the model generation unit, ２ CO emissions, which is the ratio of the difference in the ending inventory amount to the difference in the total amount. ２ a contribution rate processing unit that calculates a contribution rate of the inventory difference to the discharge amount; CO calculated by the contribution rate processing unit ２ Based on the inventory difference contribution rate of emissions and the end-of-period inventory difference of the target period, CO2 emissions related to work in progress at the end of the target period are calculated. ２ CO emissions and CO2 emissions related to work in progress at the end of the period one item prior to the target period ２ CO2 emissions from work-in-process inventory at the end of the period ２ an emission amount processing unit for determining an emission amount; Carbon dioxide emissions calculation system.

2. The end-of-period work-in-process inventory CO calculated by the emission processing unit from the total amount difference during the target period ２ The result of subtracting the emission amount is allocated to each type of product, and each allocation amount is calculated based on each CO2 emission amount for each type of product. ２ Further, an allocation processing unit is provided to allocate the amount to the emission amount. The carbon dioxide emission calculation system according to claim 1 .

3. the model generation unit generates the total quantity difference model by simple regression analysis using the total quantity difference as a response variable and the ending inventory quantity difference as an explanatory variable. The carbon dioxide emission calculation system according to claim 1 .

4. the model generation unit generates the total quantity difference model by performing multiple regression analysis using the total quantity difference as a response variable, classifying the ending inventory quantity difference by type of work-in-progress due to the process that has been performed in the period, and using ending inventory quantity differences by process work-in-progress as explanatory variables; The carbon dioxide emission calculation system according to claim 1 .

5. the model generation unit generates the total quantity difference model by performing multiple regression analysis using the total quantity difference as a response variable, dividing the ending inventory quantity difference by product type, and using each type-specific ending inventory quantity difference as an explanatory variable. The carbon dioxide emission calculation system according to claim 1 .

6. In a factory that can manufacture multiple types of products that are manufactured through multiple processes, ２ A carbon dioxide emission calculation method for calculating an emission amount for each predetermined period, For each of a plurality of periods, the CO for the entire factory for that period is prepared in advance. ２ CO emissions from the entire factory ２ CO emissions for all products completed during the period ２ Emissions of the entire product during the period ２ The CO2 emissions from the entire factory for the period are calculated based on the end inventory amount, which represents the inventory amount of the entire product at the end of the period. ２ Emissions and total CO2 for the above period ２ a model generation step of generating a total quantity difference model that represents the relationship between a total quantity difference, which is the difference between the end inventory quantity in the period immediately preceding the period in question and the discharge quantity in the period in question, and an ending inventory quantity difference, which is the difference between the end inventory quantity in the period immediately preceding the period in question and the end inventory quantity in the period in question; Based on the total amount difference model generated in the model generation step, ２ CO emissions, which is the ratio of the difference in the ending inventory amount to the difference in the total amount. ２ a contribution rate processing step for calculating a contribution rate of the inventory difference of the discharge amount; CO calculated in the contribution rate processing step ２ Based on the inventory difference contribution rate of emissions and the end-of-period inventory difference of the target period, CO2 emissions related to work in progress at the end of the target period are calculated. ２ CO emissions and CO2 emissions related to work in progress at the end of the period one item prior to the target period ２ CO2 emissions from work-in-process inventory at the end of the period ２ An emission amount processing step for determining an emission amount; Carbon dioxide emissions calculation method.

7. In a factory that can manufacture multiple types of products that are manufactured through multiple processes, ２ A carbon dioxide emission calculation program for calculating emissions for each predetermined period, which causes a computer to function as the carbon dioxide emission calculation system according to any one of claims 1 to 5.

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