CN115525001A - Safety monitoring method and system based on Internet of things - Google Patents
Safety monitoring method and system based on Internet of things Download PDFInfo
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- CN115525001A CN115525001A CN202110701950.7A CN202110701950A CN115525001A CN 115525001 A CN115525001 A CN 115525001A CN 202110701950 A CN202110701950 A CN 202110701950A CN 115525001 A CN115525001 A CN 115525001A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24024—Safety, surveillance
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- Automation & Control Theory (AREA)
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Abstract
The invention provides a safety monitoring method based on the Internet of things, which is characterized in that at least one unit organization is recorded on a management platform; collecting actual data of equipment and environmental indexes corresponding to each unit organization by a monitoring center and uploading the actual data to a cloud server; when the actual operation data of the equipment received by the cloud server is abnormal compared with the set normal operation parameters, the cloud server controls the corresponding equipment to perform self-regulation or mode switching and sends an alarm prompt to the management platform, and if the actual operation data of the equipment cannot be eliminated, a fault prompt is sent to the management platform; the monitoring center is used for monitoring the actual running state of the equipment and uploading the actual running state to the cloud server, and the management platform receives, stores and displays the information of the cloud server; the system can monitor and manage a plurality of unit organizations simultaneously, has diversified collected data, can timely discover hidden equipment hazards and ensure the safety of equipment and workers.
Description
Technical Field
The invention relates to the technical field of monitoring, in particular to a safety monitoring method and system based on the Internet of things.
Background
Large-scale production enterprises are inconvenient in equipment management due to large area of a factory, and need to monitor the large-scale production enterprises to prevent accidents caused by equipment faults.
The existing equipment monitoring method has the advantages that the acquired data is single in the using process, the operation is not better monitored, the hidden danger caused by the operation failure of the building equipment exists when the equipment is normally used, a user cannot know the specific operation condition of the equipment, and the damage to workers is possibly caused seriously.
Disclosure of Invention
The invention aims to provide a safety monitoring method and system based on the Internet of things, aiming at overcoming the defects in the prior art, which can simultaneously monitor and manage a plurality of unit organizations, diversify the acquired data, discover hidden dangers of equipment in time and ensure the safety of the equipment and workers.
In order to solve the technical problems, the invention adopts the following technical scheme:
a safety monitoring method based on the Internet of things is characterized by comprising the following operation steps:
at least inputting a unit organization on a management platform, adding equipment and environment information which need to be monitored by the unit organization, and uploading related information to a cloud server; adding normal operation parameters of equipment and normal indexes of the environment on a management platform and uploading the parameters to a cloud server, and acquiring actual data of the equipment and the environmental indexes corresponding to each unit organization by a monitoring center and uploading the data to the cloud server; when the actual operation data of the equipment received by the cloud server is abnormal compared with the set normal operation parameters, the cloud server establishes bidirectional connection with the abnormal equipment, the cloud server controls the corresponding equipment to perform self-regulation or mode switching and sends an alarm prompt to the management platform, and if the alarm prompt cannot be eliminated, the cloud server sends a fault prompt to the management platform; the management platform receives, updates and stores actual data of the equipment and the environment sent by the cloud server in real time, and displays the actual data in a data chart form;
a manager can acquire relevant monitoring information of all recorded organization units by logging in a management platform, as many large enterprises have a plurality of factories or office places, the monitoring method can be uniformly managed, labor and material cost is saved, firstly, a monitoring center is formed by arranging monitoring equipment around the monitoring equipment needed by the factories to acquire specific information of the equipment or environment needed to be monitored and upload the specific information to a cloud server, the cloud server is provided with functional modules such as a processor, a controller and a database, after receiving data sent by the monitoring center, the monitoring center and stored preset normal data are compared and analyzed, if the data exceed or are lower than a set interval, the cloud server sends an alarm prompt to the management platform, the management platform records the alarm prompt, the cloud server controls the equipment to perform self-regulation or mode switching to recover normal use, when the equipment cannot recover, the cloud server sends a fault prompt to the management platform, the management platform records the fault prompt, the manager arranges maintenance personnel to maintain or evacuate people from the environment with faults, thereby ensuring normal use and safety of the management platform, the management platform can not only can send the fault prompt to the management platform to display the management platform, but also can timely and more intuitively display the hidden danger of the management equipment.
Optionally, the monitoring center collects actual data of equipment and environmental indexes corresponding to each unit organization, wherein the actual data at least comprises combustible gas concentration, smoke concentration, electric temperature, blockage degree of a channel and water level and water pressure of fire fighting equipment; the surveillance center includes multiple equipment, not only can detect the combustible gas concentration in the environment, smoke concentration, electric temperature, the degree of lining up of passageway pipeline, the water level height of fire-fighting water tank and the pressure condition of fire-fighting pipeline, can also be used to control water supply information, drainage information, heating installation temperature information, voltage information, gas pressure information, ventilation air conditioning information and so on, the surveillance center has the ability with cloud server communication, the surveillance center can upload the data that detect to the cloud ware in real time, because the surveillance center possesses and acquires multiple data, make whole monitored control system perfect more.
Optionally, the method for displaying the management platform in the form of a data chart includes: respectively listing the monitoring center equipment for collecting each equipment and each environmental factor, at least counting the online condition and the running state of the monitoring center equipment, and generating an equipment online condition pie chart and an equipment running state pie chart for displaying; the device online condition pie chart shows the number of devices in online and offline states, and the running state of the device comprises the number of devices in normal, alarm and fault states; according to the method, a manager can visually acquire the states of all the monitored equipment under corresponding organization units by logging in a management platform, the online and offline conditions of the equipment can be found in time, the offline equipment can be corrected in time, the running state of the monitored equipment can be corrected in time, and the hidden danger can be reduced.
Optionally, the method for displaying in the form of a data chart by the management platform further includes: counting the alarm times of the equipment in at least one week, and generating an alarm trend graph by taking the alarm times of the equipment as a horizontal axis and taking the date as a vertical axis; the alarm trend graph can be a line graph or a bar graph, the alarm frequency of the equipment in a week or longer time can be clearly and visually displayed, when the alarm frequency is obviously presented in an increasing state, the equipment needs to be overhauled or corrected in advance, and the equipment condition is prevented from being more serious.
Optionally, the management platform further performs hidden danger management on the equipment and the environment to be monitored, and the hidden danger management method includes: setting a routing inspection statistical table, automatically issuing a routing inspection notice according to a preset period of the routing inspection statistical table, and recording the completed sign-in condition and routing inspection result after the routing inspection of a worker is finished; the manager can set different inspection statistical tables according to different equipment maintenance frequencies, the inspection statistical tables mainly comprise inspection units, inspection time and inspection completion conditions, workers inspect the equipment according to the specified time and frequency in the inspection statistical tables and record inspection results into the inspection statistical tables, the manager can look up the completion conditions of the workers and the specific conditions of each equipment and environment, and can also send inspection task notifications to corresponding organization units according to the period of the inspection statistical tables or when the equipment fails, the inspection task mainly comprises inspection task names, plan completion time, inspection descriptions, inspection requirements or accessories, after the lower organization receives the inspection task notifications, the lower organization correspondingly inspects, inspects or corrects the equipment or the working environment in a factory according to the requirements and completes and reports the inspection, inspection or correction within the specified time.
Adopt foretell security monitoring system based on thing networking, its characterized in that: the system comprises a monitoring center, a cloud server and a management platform, wherein the monitoring center is used for monitoring the actual running state of equipment and uploading the actual running state to the cloud server, and the management platform receives, stores and displays the information of the cloud server; the equipment and the environmental information which need to be monitored in each unit organization factory area can be collected and uploaded to the cloud server through the monitoring center, and the collected information is judged by the cloud server and then transmitted to the management platform for management personnel to look up.
Optionally, the monitoring device includes a first acquisition module for detecting an operation parameter of a device in the plant area and a second acquisition module for detecting an environmental parameter in the plant area; the first acquisition module is generally installed on the equipment that needs to monitor for gather the running state of needing monitoring equipment, and the second acquisition module is generally installed in the environment that needs to monitor for gather certain parameter in the environment, such as temperature, humidity, toxic gas content etc..
Optionally, the first acquisition module at least comprises one of a fault arc detection device, an electrical fire detection device and a fire water device pressure water level sensor; the second acquisition module at least comprises one of smoke detection equipment, combustible gas detection equipment and a channel blockage sensor; the first acquisition module can also include the device that is used for detecting the operation of air conditioner, detects plumbing equipment, detects ventilation equipment's device etc. except above-mentioned equipment, and the second acquisition module can also include the device that is used for detecting security system, detection ambient temperature, humidity, wind speed etc. can the equipment that needs the control in the all-round monitoring factory, makes the control more comprehensive.
Optionally, the management platform includes a unit management module, an internet of things monitoring module, a statistical analysis module and a hidden danger management module, the unit management module is used for managing accessed unit organizations, the internet of things monitoring module is used for displaying quantity statistics of each working state of the monitoring equipment, the statistical analysis module respectively displays running state statistics of the monitoring equipment of each unit organization in a data chart form, and the hidden danger management module is used for performing routing inspection statistics and issuing routing inspection notifications; the manager can input the name, type, industry, region, property and contact information of the organization in the organization management module, and the internet of things monitoring module is used for displaying the data information sent by the monitoring center under each organization.
Optionally, the system further comprises a receiving module, wherein the receiving module is arranged on the device in the factory floor, and the receiving module is used for receiving the information of the cloud server; when the cloud server finds the abnormality, the controller sends a regulating instruction to the monitored equipment, and the receiving module is used for receiving a command of the cloud server and transmitting the command to the monitored equipment.
Based on the above, the invention provides the safety monitoring method and system based on the internet of things, which can simultaneously monitor and manage a plurality of unit organizations, diversify the acquired data, discover hidden equipment hazards in time and ensure the safety of equipment and workers.
Detailed Description
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The technical features of the present invention may be combined with each other without conflict.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
The invention relates to a safety monitoring method and a system based on the Internet of things, which comprises the following operation steps:
at least inputting a unit organization on a management platform, adding equipment and environment information which need to be monitored by the unit organization, and uploading related information to a cloud server; adding normal operation parameters of equipment and normal indexes of the environment on a management platform and uploading the parameters to a cloud server, and acquiring actual data of the equipment and the environmental indexes corresponding to each unit organization by a monitoring center and uploading the data to the cloud server; when the actual operation data of the equipment received by the cloud server is abnormal compared with the set normal operation parameters, the cloud server establishes bidirectional connection with the abnormal equipment, the cloud server controls the corresponding equipment to perform self-regulation or mode switching and sends an alarm prompt to the management platform, and if the alarm prompt cannot be eliminated, the cloud server sends a fault prompt to the management platform; the management platform receives, updates and stores actual data of the equipment and the environment sent by the cloud server in real time, and displays the actual data in a data chart form;
a manager can acquire relevant monitoring information of all recorded organization units by logging in a management platform, as many large enterprises have a plurality of factories or office places, the monitoring method can be uniformly managed, labor and material cost is saved, firstly, a monitoring center is formed by arranging monitoring equipment around the monitoring equipment needed by the factories to acquire specific information of the equipment or environment needed to be monitored and upload the specific information to a cloud server, the cloud server is provided with functional modules such as a processor, a controller and a database, after receiving data sent by the monitoring center, the monitoring center and stored preset normal data are compared and analyzed, if the data exceed or are lower than a set interval, the cloud server sends an alarm prompt to the management platform, the management platform records the alarm prompt, the cloud server controls the equipment to perform self-regulation or mode switching to recover normal use, when the equipment cannot recover, the cloud server sends a fault prompt to the management platform, the management platform records the fault prompt, the manager arranges maintenance personnel to maintain or evacuate people from the environment with faults, thereby ensuring normal use and safety of the management platform, the management platform can not only can send the fault prompt to the management platform to display the management platform, but also can timely and more intuitively display the hidden danger of the management equipment.
In some embodiments, the monitoring center collects actual data of equipment and environmental indexes corresponding to each unit tissue, wherein the actual data at least comprises combustible gas concentration, smoke concentration, electric temperature, channel blockage degree and water level and water pressure of fire fighting equipment; the surveillance center includes multiple equipment, not only can the combustible gas concentration in the detected environment, smoke concentration, electric temperature, the degree of lining up of passageway pipeline, fire water tank's water level height and fire pipeline's pressure condition, can also be used to monitor water supply information, drainage information, heating installation temperature information, voltage information, gas pressure information, ventilation air conditioning information and so on, the surveillance center has the ability with cloud server communication, the surveillance center can upload the cloud ware with the data that detect in real time, because the surveillance center possesses and acquires multiple data, make whole monitored control system perfect more.
In some embodiments, the method for showing the management platform in the form of the data chart is as follows: respectively listing the monitoring center equipment for collecting each equipment and each environmental factor, at least counting the online condition and the running state of the monitoring center equipment, and generating an equipment online condition pie chart and an equipment running state pie chart for displaying; the device online condition pie chart shows the number of devices in online and offline states, and the running state of the device comprises the number of devices in normal, alarm and fault states; according to the method, a manager can visually acquire the states of all the monitored equipment under corresponding organization units by logging in a management platform, the online and offline conditions of the equipment can be found in time, the offline equipment can be corrected in time, the running state of the monitored equipment can be corrected in time, and the hidden danger can be reduced.
In some embodiments, the method for presenting in the form of a data diagram by the management platform further comprises: counting the alarm times of the equipment in at least one week, and generating an alarm trend graph by taking the alarm times of the equipment as a horizontal axis and taking the date as a vertical axis; the alarm trend graph can be a line graph or a bar graph, the alarm frequency of the equipment in a week or longer time can be clearly and visually displayed, when the alarm frequency is obviously presented in an increasing state, the equipment needs to be overhauled or corrected in advance, and the equipment condition is prevented from being more serious.
In some embodiments, the management platform further performs hidden danger management on the equipment and the environment to be monitored, and the hidden danger management method includes: setting a routing inspection statistical table, automatically issuing a routing inspection notice according to a preset period of the routing inspection statistical table, and recording the completed sign-in condition and routing inspection result after the routing inspection of a worker is finished; the manager can set different inspection statistical tables according to different equipment maintenance frequencies, the inspection statistical tables mainly comprise inspection units, inspection time and inspection completion conditions, workers inspect the equipment according to the specified time and frequency in the inspection statistical tables and record inspection results into the inspection statistical tables, the manager can look up the completion conditions of the workers and the specific conditions of each equipment and environment, and can also send inspection task notifications to corresponding organization units according to the period of the inspection statistical tables or when the equipment fails, the inspection task mainly comprises inspection task names, plan completion time, inspection descriptions, inspection requirements or accessories, after the lower organization receives the inspection task notifications, the lower organization correspondingly inspects, inspects or corrects the equipment or the working environment in a factory according to the requirements and completes and reports the inspection, inspection or correction within the specified time.
The safety monitoring system based on the Internet of things comprises a monitoring center, a cloud server and a management platform, wherein the monitoring center is used for monitoring the actual running state of equipment and uploading the actual running state to the cloud server, and the management platform receives, stores and displays information of the cloud server; the equipment and the environmental information which need to be monitored in each unit organization factory area can be collected and uploaded to the cloud server through the monitoring center, and the collected information is judged by the cloud server and then transmitted to the management platform for management personnel to look up.
In some embodiments, a monitoring device includes a first collection module for detecting operational parameters of a device within a factory floor and a second collection module for detecting environmental parameters within the factory floor; the first acquisition module is generally installed on the equipment that needs to monitor for gather the running state of needing monitoring equipment, and the second acquisition module is generally installed in the environment that needs to monitor for gather certain parameter in the environment, such as temperature, humidity, toxic gas content etc..
In some embodiments, the first collection module comprises at least one of a fault arc detection device, an electrical fire detection device, a fire water device pressure water level sensor; the second acquisition module at least comprises one of smoke detection equipment, combustible gas detection equipment and a channel blockage sensor; the first acquisition module can also include the device that is used for detecting the operation of air conditioner, detects plumbing equipment, detects ventilation equipment's device etc. except above-mentioned equipment, and the second acquisition module can also include the device that is used for detecting security system, detection ambient temperature, humidity, wind speed etc. can the equipment that needs the control in the all-round monitoring factory, makes the control more comprehensive.
In some embodiments, the management platform comprises a unit management module, an internet of things monitoring module, a statistical analysis module and a hidden danger management module, wherein the unit management module is used for managing accessed unit organizations, the internet of things monitoring module is used for displaying the quantity statistics of all working states of monitoring equipment, the statistical analysis module is used for displaying the running state statistics of the monitoring equipment of all the unit organizations in a data chart mode, and the hidden danger management module is used for performing routing inspection statistics and issuing routing inspection notifications; the manager can input the name, type, industry, region, property and contact information of the organization in the organization management module, and the internet of things monitoring module is used for displaying the data information sent by the monitoring center under each organization.
In some embodiments, the system further comprises a receiving module, wherein the receiving module is arranged on the device in the factory floor, and is used for receiving the information of the cloud server; when the cloud server finds the abnormality, the controller sends a regulating instruction to the monitored equipment, and the receiving module is used for receiving a command of the cloud server and transmitting the command to the monitored equipment.
Based on the above, the invention provides the safety monitoring method and system based on the internet of things, which can simultaneously monitor and manage a plurality of unit organizations, diversify the acquired data, discover hidden equipment hazards in time and ensure the safety of equipment and workers.
It is to be understood that the present application is not limited to the precise arrangements that have been described above and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A safety monitoring method based on the Internet of things is characterized by comprising the following operation steps:
at least one unit organization is input into the management platform, equipment and environment information which need to be monitored by the unit organization are added, and relevant information is uploaded to the cloud server;
adding normal operation parameters of equipment and normal indexes of the environment on a management platform and uploading the parameters to a cloud server, and acquiring actual data of the equipment and the environment indexes corresponding to each unit organization by a monitoring center and uploading the data to the cloud server;
when the actual operation data of the equipment received by the cloud server is abnormal compared with the set normal operation parameters, the cloud server establishes bidirectional connection with the abnormal equipment, the cloud server controls the corresponding equipment to perform self-regulation or mode switching and sends an alarm prompt to the management platform, and if the alarm prompt cannot be eliminated, the cloud server sends a fault prompt to the management platform;
and the management platform receives, updates and stores the actual data of the equipment and the environment sent by the cloud server in real time, and displays the actual data in a data chart form.
2. The Internet of things-based security monitoring method according to claim 1, wherein: the monitoring center collects the actual data of the equipment and the environmental indexes corresponding to each unit organization, wherein the actual data at least comprises the combustible gas concentration, the smoke concentration, the electric temperature, the blockage degree of a channel and the water level and the water pressure of fire fighting equipment.
3. The Internet of things-based security monitoring method according to claim 1, wherein: the method for displaying the management platform in the form of the data chart comprises the following steps: respectively listing the monitoring center equipment for collecting each equipment and each environmental factor, at least counting the online condition and the running state of the monitoring center equipment, and generating an equipment online condition pie chart and an equipment running state pie chart for displaying;
the device online condition pie chart shows the number of devices in online and offline states, and the running states of the devices include the number of devices in normal, alarm and fault states.
4. The Internet of things-based security monitoring method according to claim 1, wherein: the method for showing the management platform in the form of the data chart further comprises the following steps: and counting the alarm times of the equipment in at least one week, and generating an alarm trend graph by taking the alarm times of the equipment as a horizontal axis and taking the date as a vertical axis.
5. The security monitoring method based on the internet of things as claimed in claim 1, wherein: the management platform also carries out hidden danger management on the equipment and the environment to be monitored, and the hidden danger management method comprises the following steps: and setting the inspection statistical table, automatically issuing an inspection notice according to a preset period of the inspection statistical table, and finishing the sign-in condition and inputting an inspection result after the inspection of a worker is finished.
6. The utility model provides a safety monitoring system based on thing networking which characterized in that: the system comprises a monitoring center, a cloud server and a management platform, wherein the monitoring center is used for monitoring the actual running state of equipment and uploading the actual running state to the cloud server, and the management platform receives, stores and displays the information of the cloud server.
7. The internet of things-based security monitoring system of claim 6, wherein: the monitoring equipment comprises a first acquisition module for detecting the operation parameters of the equipment in the plant area and a second acquisition module for detecting the environmental parameters in the plant area.
8. The internet of things-based security monitoring system of claim 7, wherein: the first acquisition module at least comprises one of a fault electric arc detection device, an electrical fire detection device and a fire water equipment pressure water level sensor; the second acquisition module at least comprises one of smoke detection equipment, combustible gas detection equipment and a channel blockage sensor.
9. The internet of things-based security monitoring system of claim 6, wherein: the management platform comprises a unit management module, an internet of things monitoring module, a statistical analysis module and a hidden danger management module, wherein the unit management module is used for managing unit organization of access, the internet of things monitoring module is used for displaying the quantity statistics of each working state of the monitoring equipment, the statistical analysis module is used for displaying the running state statistics of the monitoring equipment organized by each unit respectively in the form of a data chart, and the hidden danger management module is used for performing routing inspection statistics and issuing routing inspection notification.
10. The internet of things-based security monitoring system according to claim 6, wherein: the cloud server further comprises a receiving module, wherein the receiving module is arranged on equipment in a factory floor and used for receiving the information of the cloud server.
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| CN202110701950.7A CN115525001A (en) | 2021-06-24 | 2021-06-24 | Safety monitoring method and system based on Internet of things |
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| CN202110701950.7A CN115525001A (en) | 2021-06-24 | 2021-06-24 | Safety monitoring method and system based on Internet of things |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116320833A (en) * | 2023-05-24 | 2023-06-23 | 广州耐奇电气科技有限公司 | Heat supply pipe network monitoring method based on Internet of things technology |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116320833A (en) * | 2023-05-24 | 2023-06-23 | 广州耐奇电气科技有限公司 | Heat supply pipe network monitoring method based on Internet of things technology |
| CN116320833B (en) * | 2023-05-24 | 2023-09-19 | 广州耐奇电气科技有限公司 | Heat supply pipe network monitoring method based on Internet of things technology |
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