Septic tank safety management system based on digital application

Abstract

The invention discloses a septic tank safety management system based on digital application, and relates to the technical field of domestic sewage treatment equipment, the septic tank safety management system comprises an intelligent monitoring terminal, a data management platform, an administrator terminal and an operator terminal, the data management platform comprises a data acquisition unit, a distributed modeling unit, a data analysis unit and an early warning notification unit; according to the invention, each piece of real-time environment information in the septic tank is obtained through the intelligent monitoring terminal, the distributed model in the region is constructed based on the distribution state of the septic tank, and the environment state abnormity in the septic tank is judged by combining the distributed model in the region and the real-time environment information. Meanwhile, abnormal personnel activities around the manure pit are judged in combination with the weighting state of the administrator terminal and the real-time environment information, a target operation and maintenance site is quickly selected when the abnormal state occurs, a maintenance notice is sent to the target operation and maintenance site, the abnormity occurring in the manure pit is positioned in time, maintenance feedback is quickly made, and the maintenance efficiency is improved. And the public safety problem is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of domestic sewage treatment equipment, and in particular to a septic tank safety management system based on digital applications. Background Art

[0002] Septic tanks are important facilities for treating domestic sewage and excreta in cities and rural areas. Septic tanks contain a large number of potentially pathogenic bacteria and viruses, as well as a large amount of explosive gases produced by excreta. Therefore, there are certain safety hazards. Safety accidents such as explosions and leaks not only pose risks to the safety of personnel, but also pollute the environment. In existing technologies, the system of the Urban Management Bureau fails to monitor the safety of septic tanks in real time, and fails to cover the entire process and all-round workflow of septic tank production and operation. In particular, in key links and processes such as septic tank cleaning, residue disposal, and operational safety, the existing monitoring system lacks in-depth application and effective support. For example, during the septic tank cleaning process, how to ensure the safety of operators and how to efficiently dispose of residues are the issues;

[0003] In view of the above technical defects, a solution is now proposed. Summary of the Invention

[0004] The purpose of the present invention is:

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a septic tank safety management system based on digital application, including an intelligent monitoring terminal, a data management platform, an administrator terminal and an operator terminal;

[0006] The intelligent monitoring terminal is a sensor assembly installed in each septic tank. The sensor assembly obtains real-time environmental information in the septic tank and integrates it into a data set and sends it to the data acquisition unit. The sensor assembly includes a liquid level sensor for monitoring the liquid level in the septic tank, a temperature and humidity sensor for monitoring the temperature and humidity inside the septic tank and the temperature and humidity outside the septic tank, a gas sensor for monitoring the concentration of combustible gas, and a passive infrared sensor for detecting abnormal movements around the septic tank.

[0007] The data management platform includes a data acquisition unit, a distributed modeling unit, a data analysis unit, and an early warning notification unit;

[0008] The data acquisition unit is used to acquire and pre-process the data set, and send the precise environmental data and behavioral data obtained after the pre-processing to the data analysis unit;

[0009] The distributed modeling unit is used to obtain the distribution location of each septic tank and operation and maintenance site in the region and the geographic information data in the region, select the center point of the region, establish a regional plane coordinate system based on the geographic information data in the region with the center point of the region as the center of the circle, calibrate the distribution location of each septic tank and operation and maintenance site in the regional plane coordinate system, and construct a distributed model in the region;

[0010] The data analysis unit obtains the coordinates of each septic tank from the distributed model in the area, and obtains the precise environmental data and behavioral data corresponding to each septic tank, determines whether the environmental state of the septic tank is abnormal based on the real-time precise environmental data, and determines whether the behavioral state around the septic tank is abnormal based on the real-time precise behavioral data, and generates an early warning signal when the environmental state or the behavioral state is abnormal and sends it to the early warning notification unit;

[0011] The early warning notification unit obtains and processes the early warning signal, obtains the coordinate position of the abnormal septic tank according to the early warning signal, calculates the distance L between the abnormal septic tank and each operation and maintenance site in the distributed model in the area according to the coordinate position of the abnormal septic tank, selects the optimal operation and maintenance site and the candidate operation and maintenance sites, obtains the operating status of the operators in the optimal operation and maintenance site and the candidate operation and maintenance sites through the administrator terminal, compares them to obtain the target operation and maintenance site, and sends a maintenance notification to the target operation and maintenance site.

[0012] Furthermore, the administrator terminal is used to provide the administrator with an administrator account that can be logged in, and to verify the administrator's login information, to empower the verified administrator account, and to obtain the operator's working time and working point location information and to determine whether there is abnormal working behavior, so as to generate a review signal and send it to the data analysis unit.

[0013] Furthermore, the operator terminal is used to provide the operator with a log-in operator account, verify the operator's login information, authorize the verified operator account, and record the operator's working time and working point location information and send it to the administrator terminal.

[0014] Furthermore, the specific process of obtaining the data set and preprocessing is as follows:

[0015] S101, obtaining a data set, wherein the data set includes liquid level data, temperature data, humidity data, combustible gas concentration data, and infrared radiation data in the septic tank;

[0016] S102. Remove duplicate data one by one from the liquid level data, temperature data, humidity data, and combustible gas concentration data in the septic tank, correct abnormal values, and integrate them into precise environmental data. Convert infrared radiation data into infrared signal values ​​and integrate them into precise behavioral data.

[0017] Furthermore, the specific process of obtaining the regional distribution model is as follows:

[0018] S201. Obtaining the distribution location data of each septic tank and operation and maintenance site in the region and the geographic information data in the region, wherein the geographic information data in the region includes remote sensing images, terrain distribution data, regional population distribution density, and water body distribution data;

[0019] S202, cleaning and formatting the distribution location data and geographic information data, processing missing values ​​and outliers, and performing necessary conversions, and loading the processed geographic information data into the GIS software;

[0020] S203, identifying and extracting important features from each distribution location data and geographic information data, obtaining a feature set, constructing a regional distribution model using a spatial regression model, evaluating the fitting effect of the regional distribution model, and performing parameter estimation;

[0021] S204: Visualize the distributed model in the region in the form of a map and send it to the data analysis unit and the administrator terminal.

[0022] Furthermore, the specific process of judging whether the environmental status of the septic tank is abnormal is as follows:

[0023] S301, obtaining accurate environmental data, analyzing the accurate environmental data to obtain corrected liquid level data L, temperature data T, humidity data RH, and combustible gas concentration data B in the septic tank;

[0024] S302, calculate the environmental state coefficient Kn according to the following formula: Among them, e1, e2, e3 and e4 are preset proportional coefficients, L0 is the preset basic liquid level data, and the environmental state coefficient Ki represents the comprehensive state in the septic tank under the current environmental data;

[0025] S303, and then calculate the environmental state fluctuation value Ui according to the following formula: Where i = 1, 2, 3, ..., n, the smaller the environmental state fluctuation coefficient, the more stable the comprehensive state in the septic tank is; conversely, the smaller the environmental state fluctuation coefficient, the more unstable the comprehensive state in the septic tank is.

[0026] S303: Obtain a preset environmental coefficient threshold value. If the environmental state fluctuation value is greater than the environmental coefficient threshold value, generate an early warning signal and send it to the early warning notification unit;

[0027] If the environmental state fluctuation value is less than or equal to the environmental coefficient threshold, an early warning signal is generated and sent to the early warning notification unit.

[0028] Furthermore, the specific process of determining whether there is an abnormal behavior state around the septic tank is as follows:

[0029] S401, obtaining precise behavior data, i.e., infrared signal value Yi, and calculating infrared signal difference ΔY=Yi-Y0 according to a preset infrared signal standard value Y0;

[0030] S402: obtaining a preset infrared signal fluctuation threshold, and if the infrared signal difference is less than the infrared signal fluctuation threshold, no signal is generated;

[0031] If the infrared signal difference is greater than or equal to the infrared signal fluctuation threshold, an approval signal is generated and sent to the administrator terminal. If a review signal is obtained from the administrator terminal, no signal is generated;

[0032] If the review signal is not obtained from the administrator terminal, an early warning signal is generated and sent to the early warning notification unit.

[0033] Furthermore, the specific process of obtaining the target operation and maintenance site is as follows:

[0034] S501. Obtain the coordinate position Q (xq, yq) of the abnormal septic tank, and obtain the position coordinates P (xp, yp) of each operation and maintenance site in the distributed model within the region;

[0035] S502. Calculate the maintenance distance L according to the following formula:

[0036] S503. Sort the multiple maintenance distances L in ascending order to obtain the first-ranked maintenance distance L1 and the second-ranked maintenance distance L2, and then obtain the corresponding optimal operation and maintenance site and candidate operation and maintenance sites;

[0037] S504: Obtain the work status of operators in the optimal operation and maintenance site and candidate operation and maintenance sites through the administrator terminal. If there are idle operators in the optimal operation and maintenance site, the optimal operation and maintenance site is selected as the target operation and maintenance site.

[0038] If there are no idle operators in the optimal operation and maintenance site, the candidate operation and maintenance site will be the target operation and maintenance site.

[0039] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0040] The present invention obtains real-time environmental information in the septic tank through an intelligent monitoring terminal, and constructs a distributed model in the area based on the distribution status of the septic tank. It determines whether the environmental status in the septic tank is abnormal by combining the distributed model and real-time environmental information in the area. At the same time, it determines whether there are abnormal activities of people around the septic tank by combining the authorization status of the administrator terminal and the real-time environmental information. When an abnormal status occurs, the target operation and maintenance site is quickly selected, and a maintenance notification is issued to the target operation and maintenance site. The abnormality in the septic tank is located in time and maintenance feedback is quickly made, thereby avoiding public safety issues. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Shown is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Example:

[0044] like Figure 1 As shown in the figure, the septic tank safety management system based on digital applications includes intelligent monitoring terminals, data management platforms, administrator terminals and operator terminals;

[0045] The intelligent monitoring terminal is a sensor assembly installed in each septic tank. The sensor assembly obtains real-time environmental information in the septic tank and integrates it into a data set and sends it to the data acquisition unit. The sensor assembly includes a liquid level sensor for monitoring the liquid level in the septic tank, a temperature and humidity sensor for monitoring the temperature and humidity inside the septic tank and the temperature and humidity outside the septic tank, a gas sensor for monitoring the concentration of combustible gas, and a passive infrared sensor for detecting abnormal movements around the septic tank.

[0046] The data management platform includes a data acquisition unit, a distributed modeling unit, a data analysis unit, and an early warning notification unit;

[0047] The data acquisition unit is used to acquire and preprocess the data set, and then send the obtained precise environmental data and behavioral data to the data analysis unit;

[0048] The distributed modeling unit is used to obtain the distribution locations of each septic tank and operation and maintenance site in the region and the geographic information data in the region, select the regional center point, establish a regional plane coordinate system based on the geographic information data in the region with the regional center point as the center of the circle, calibrate the distribution locations of each septic tank and operation and maintenance site in the regional plane coordinate system, and construct a distributed model in the region;

[0049] The data analysis unit obtains the coordinates of each septic tank from the distributed model in the area, and obtains the precise environmental data and behavioral data corresponding to each septic tank, determines whether the environmental state of the septic tank is abnormal based on the real-time precise environmental data, and determines whether the behavioral state around the septic tank is abnormal based on the real-time precise behavioral data. When the environmental state or the behavioral state is abnormal, an early warning signal is generated and sent to the early warning notification unit;

[0050] The early warning notification unit obtains and processes the early warning signal, obtains the coordinate position of the abnormal septic tank based on the early warning signal, calculates the distance L between the abnormal septic tank and each operation and maintenance site in the distributed model in the area based on the coordinate position of the abnormal septic tank, selects the optimal operation and maintenance site and candidate operation and maintenance sites, obtains the operating status of the operators in the optimal operation and maintenance site and the candidate operation and maintenance site through the administrator terminal, compares them to obtain the target operation and maintenance site, and issues a maintenance notification to the target operation and maintenance site.

[0051] The administrator terminal is used to provide the administrator with an administrator account that can be logged in, verify the administrator's login information, empower the verified administrator account, obtain the operator's working time and working point location information, and determine whether there is any abnormal working behavior, so as to generate a review signal and send it to the data analysis unit.

[0052] The operator terminal is used to provide operators with a login account, verify the operator's login information, grant permissions to the verified operator account, and record the operator's working time and working point location information and send it to the administrator terminal.

[0053] The specific process of obtaining the data set and preprocessing is as follows:

[0054] S101, obtaining a data set, where the data set includes liquid level data, temperature data, humidity data, combustible gas concentration data, and infrared radiation data in the septic tank;

[0055] S102. Remove duplicate data one by one from the liquid level data, temperature data, humidity data, and combustible gas concentration data in the septic tank, correct abnormal values, and integrate them into precise environmental data. Convert infrared radiation data into infrared signal values ​​and integrate them into precise behavioral data.

[0056] The specific process of obtaining the distributed model within the region is as follows:

[0057] S201. Obtaining the distribution location data of each septic tank and operation and maintenance site in the region and the geographic information data in the region, wherein the geographic information data in the region includes remote sensing images, terrain distribution data, regional population distribution density, and water body distribution data;

[0058] S202, cleaning and formatting the distribution location data and geographic information data, processing missing values ​​and outliers, and performing necessary conversions, and loading the processed geographic information data into the GIS software;

[0059] S203, identifying and extracting important features from each distribution location data and geographic information data, obtaining a feature set, constructing a regional distribution model using a spatial regression model, evaluating the fitting effect of the regional distribution model, and performing parameter estimation;

[0060] S204: Visualize the distributed model in the region in the form of a map and send it to the data analysis unit and the administrator terminal.

[0061] The specific process of judging whether the environmental status of the septic tank is abnormal is as follows:

[0062] S301, obtaining accurate environmental data, analyzing the accurate environmental data to obtain corrected liquid level data L, temperature data T, humidity data RH, and combustible gas concentration data B in the septic tank;

[0063] S302, calculate the environmental state coefficient Kn according to the following formula: Among them, e1, e2, e3 and e4 are preset proportional coefficients, L0 is the preset basic liquid level data, and the environmental state coefficient Ki represents the comprehensive state in the septic tank under the current environmental data;

[0064] S303, and then calculate the environmental state fluctuation value Ui according to the following formula: Where i = 1, 2, 3, ..., n, the smaller the environmental state fluctuation coefficient, the more stable the comprehensive state in the septic tank is; conversely, the smaller the environmental state fluctuation coefficient, the more unstable the comprehensive state in the septic tank is.

[0065] S303: Obtain a preset environmental coefficient threshold value. If the environmental state fluctuation value is greater than the environmental coefficient threshold value, generate an early warning signal and send it to the early warning notification unit;

[0066] If the environmental state fluctuation value is less than or equal to the environmental coefficient threshold, an early warning signal is generated and sent to the early warning notification unit.

[0067] The specific process of determining whether there is abnormal behavior around the septic tank is as follows:

[0068] S401, obtaining precise behavior data, i.e., infrared signal value Yi, and calculating infrared signal difference ΔY=Yi-Y0 according to a preset infrared signal standard value Y0;

[0069] S402: obtaining a preset infrared signal fluctuation threshold, and if the infrared signal difference is less than the infrared signal fluctuation threshold, no signal is generated;

[0070] If the infrared signal difference is greater than or equal to the infrared signal fluctuation threshold, an approval signal is generated and sent to the administrator terminal. If a review signal is obtained from the administrator terminal, no signal is generated;

[0071] If the review signal is not obtained from the administrator terminal, an early warning signal is generated and sent to the early warning notification unit.

[0072] The specific process of obtaining the target operation and maintenance site is as follows:

[0073] S501. Obtain the coordinate position Q (xq, yq) of the abnormal septic tank, and obtain the position coordinates P (xp, yp) of each operation and maintenance site in the distributed model within the region;

[0074] S502. Calculate the maintenance distance L according to the following formula:

[0075] S503. Sort the multiple maintenance distances L in ascending order to obtain the first-ranked maintenance distance L1 and the second-ranked maintenance distance L2, and then obtain the corresponding optimal operation and maintenance site and candidate operation and maintenance sites;

[0076] S504: Obtain the work status of operators in the optimal operation and maintenance site and candidate operation and maintenance sites through the administrator terminal. If there are idle operators in the optimal operation and maintenance site, the optimal operation and maintenance site is selected as the target operation and maintenance site.

[0077] If there are no idle operators in the optimal operation and maintenance site, the candidate operation and maintenance site will be the target operation and maintenance site.

[0078] The present invention obtains real-time environmental information in the septic tank through an intelligent monitoring terminal, and constructs a distributed model in the area based on the distribution status of the septic tank. It determines whether the environmental status in the septic tank is abnormal by combining the distributed model and real-time environmental information in the area. At the same time, it determines whether there are abnormal activities of people around the septic tank by combining the authorization status of the administrator terminal and the real-time environmental information. When an abnormal status occurs, the target operation and maintenance site is quickly selected, and a maintenance notification is issued to the target operation and maintenance site. The abnormality in the septic tank is located in time and maintenance feedback is quickly made, thereby avoiding public safety issues.

[0079] The threshold is set to facilitate comparison. The size of the threshold depends on the amount of sample data and the number of bases set by technicians in this field for each set of sample data; as long as it does not affect the proportional relationship between the parameter and the quantized value.

[0080] The above formulas are all dimensionless and numerical calculations. The formulas are obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formulas are set by those skilled in the art according to actual conditions.

[0081] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A septic tank safety management system based on digital applications, characterized in that: Including intelligent monitoring terminal, data management platform, administrator terminal and operator terminal; The intelligent monitoring terminal is a sensor assembly installed in each septic tank. The sensor assembly obtains various real-time environmental information in the septic tank and integrates it into a data set and sends it to the data acquisition unit. The sensor assembly includes a liquid level sensor for monitoring the liquid level in the septic tank, a temperature and humidity sensor for monitoring the temperature and humidity in the septic tank and the temperature and humidity outside the septic tank, a gas sensor for monitoring the concentration of combustible gas, and a passive infrared sensor for detecting abnormal movements around the septic tank; The data management platform includes a data acquisition unit, a distributed modeling unit, a data analysis unit, and an early warning notification unit; The data acquisition unit is used to acquire and preprocess the data set, and send the precise environmental data and behavioral data obtained after the preprocessing to the data analysis unit; The distributed modeling unit is used to obtain the distribution positions of each septic tank and operation and maintenance site in the region and the geographic information data in the region, select the center point of the region, establish a regional plane coordinate system based on the geographic information data in the region with the center point of the region as the center of the circle, calibrate the distribution positions of each septic tank and operation and maintenance site in the regional plane coordinate system, and construct a distributed model in the region; The data analysis unit obtains the coordinates of each septic tank from the distributed model in the area, and obtains the precise environmental data and behavior data corresponding to each septic tank, determines that the environmental state of the septic tank is abnormal based on the real-time precise environmental data, and determines that there is an abnormal behavior state around the septic tank based on the real-time precise behavior data, and generates an early warning signal when the environmental state is abnormal or the behavior state is abnormal and sends it to the early warning notification unit; The early warning notification unit obtains and processes the early warning signal, obtains the coordinate position of the abnormal septic tank according to the early warning signal, calculates the distance L between the abnormal septic tank and each operation and maintenance site in the distributed model in the region according to the coordinate position of the abnormal septic tank, selects the optimal operation and maintenance site and the candidate operation and maintenance sites, obtains the operating status of the operators in the optimal operation and maintenance site and the candidate operation and maintenance sites through the administrator terminal, compares them to obtain the target operation and maintenance site, and sends a maintenance notification to the target operation and maintenance site.

2. The septic tank safety management system based on digital application according to claim 1 is characterized in that: The administrator terminal is used to provide an administrator with an administrator account that can be logged in, and to verify the administrator's login information, to grant permissions to the verified administrator account, and to obtain the operator's working time and working point location information and determine whether there is any abnormal working behavior, so as to generate a review signal and send it to the data analysis unit.

3. The septic tank safety management system based on digital application according to claim 1 is characterized in that: The operator terminal is used to provide the operator with an operator account that can be logged in, and to verify the operator's login information, to grant permissions to the verified operator account, and to record the operator's working time and working point location information and send it to the administrator terminal.

4. The septic tank safety management system based on digital application according to claim 1 is characterized in that: The specific process of obtaining the data set and preprocessing it is as follows: S101, obtaining a data set, wherein the data set includes liquid level data, temperature data, humidity data, combustible gas concentration data and infrared radiation data in the septic tank; S102. Remove duplicate data one by one from the liquid level data, temperature data, humidity data, and combustible gas concentration data in the septic tank, correct abnormal values, and integrate them into precise environmental data. Convert infrared radiation data into infrared signal values ​​and integrate them into precise behavioral data.

5. The septic tank safety management system based on digital application according to claim 1 is characterized in that: The specific process of obtaining the distributed model within the region is as follows: S201, obtaining the distribution location data of each septic tank and operation and maintenance site in the region and the geographic information data in the region, wherein the geographic information data in the region includes remote sensing images, terrain distribution data, regional population distribution density and water body distribution data; S202, cleaning and formatting the distribution location data and geographic information data, processing missing values ​​and abnormal values, and performing necessary conversions, and loading the processed geographic information data into the GIS software; S203, respectively identifying and extracting important features from each distribution location data and geographic information data to obtain a feature set, using a spatial regression model to construct a regional distribution model, and evaluating the fitting effect of the regional distribution model and performing parameter estimation; S204: Visualize the distributed model in the region in the form of a map, and send it to the data analysis unit and the administrator terminal.

6. The septic tank safety management system based on digital application according to claim 1 is characterized in that: The specific process of judging whether the environmental status of the septic tank is abnormal is as follows: S301, obtaining accurate environmental data, analyzing the accurate environmental data to obtain corrected liquid level data L, temperature data T, humidity data RH, and combustible gas concentration data B in the septic tank; S302, calculate the environmental state coefficient Kn according to the following formula: Among them, e1, e2, e3 and e4 are preset proportional coefficients, L0 is the preset basic liquid level data, and the environmental state coefficient Ki represents the comprehensive state in the septic tank under the current environmental data; S303, and then calculate the environmental state fluctuation value Ui according to the following formula: Where i = 1, 2, 3, ..., n; S303, obtaining a preset environmental coefficient threshold, and if the environmental state fluctuation value is greater than the environmental coefficient threshold, generating a warning signal and sending it to a warning notification unit; If the environmental state fluctuation value is less than or equal to the environmental coefficient threshold, an early warning signal is generated and sent to the early warning notification unit.

7. The septic tank safety management system based on digital application according to claim 1 is characterized in that: The specific process of judging whether there is abnormal behavior around the septic tank is as follows: S401, obtaining accurate behavior data, i.e., infrared signal value Yi, and calculating infrared signal difference ΔY=Yi-Y0 according to a preset infrared signal standard value Y0; S402, obtaining a preset infrared signal fluctuation threshold, if the infrared signal difference is less than the infrared signal fluctuation threshold, no signal is generated; If the infrared signal difference is greater than or equal to the infrared signal fluctuation threshold, an approval signal is generated and sent to the administrator terminal. If a review signal is obtained from the administrator terminal, no signal is generated; If the review signal is not obtained from the administrator terminal, an early warning signal is generated and sent to the early warning notification unit.

8. The septic tank safety management system based on digital application according to claim 1 is characterized in that: The specific process of obtaining the target operation and maintenance site is as follows: S501, obtaining the coordinate position Q (xq, yq) of the abnormal septic tank, and obtaining the position coordinates P (xp, yp) of each operation and maintenance site in the distributed model in the region; S502. Calculate the maintenance distance L according to the following formula: S503, sorting the multiple maintenance distances L in ascending order to obtain a first-order maintenance distance L1 and a second-order maintenance distance L2, and then obtaining the corresponding optimal operation and maintenance site and candidate operation and maintenance site; S504: Obtain the operation status of operators in the optimal operation and maintenance site and the candidate operation and maintenance sites through the administrator terminal. If there are idle operators in the optimal operation and maintenance site, the optimal operation and maintenance site is the target operation and maintenance site. If there are no idle operators in the optimal operation and maintenance site, the candidate operation and maintenance site will be the target operation and maintenance site.

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