Worker climbing judgment system

Abstract

The invention discloses a worker climbing judgment system, and relates to the technical field of climbing operation. The worker climbing judgment system comprises an operation monitoring unit, a data processing unit, a safety management unit and an abnormal early warning unit. The problems that an existing manager cannot conveniently supervise a climbing operator and supervision is incomplete are solved, the operation monitoring unit comprises a safety helmet, an intelligent bracelet and a vest, the safety helmet emits a plurality of light beams through a detection module for detection, and therefore whether the current operator is in a climbing working state or not can be confirmed, and the safety of the current operator is ensured. The working state of the operating personnel can be effectively monitored by field management personnel, blood oxygen data and heartbeat data of the operating personnel are measured by the intelligent hand, the vital sign state of the operating personnel can be mastered by the management personnel in real time, gravitational acceleration data of the operating personnel are acquired by the vest, and whether the operating personnel wear an intelligent safety rope or not is judged. And the operation monitoring unit is convenient for managers to supervise operators.

Description

Technical Field

[0001] The invention relates to the technical field of high-altitude operations, in particular to a worker high-altitude judgment system. Background Art

[0002] Work with a height of more than 2 meters is considered high-altitude work. During the high-altitude work, there is a great risk of people falling from high altitude. When the workers go from a static state to a high-altitude state, or when the working height reaches a certain height, high-altitude falling accidents are most likely to occur. Once a worker falls from high altitude, it is easy to cause casualties. Therefore, construction units are generally required to use full-time supervisors to monitor the safety of workers, and full-time supervisors conduct safety supervision on the ground. However, it is currently difficult to control the safety of full-time supervisors on site, especially when workers climb to a certain height. Due to the long distance between them and the full-time supervisors, it is difficult for the on-site supervisors to effectively monitor the workers' work behavior. In addition, workers may feel physically unwell due to high-altitude work, and the life characteristics data of workers cannot be grasped by the on-site supervisors in real time, which poses a great hidden danger to the safety of workers; therefore, it does not meet the existing needs, and we have proposed a worker climbing judgment system. Summary of the invention

[0003] The purpose of the present invention is to provide a worker climbing judgment system, which emits several light beams for detection through a safety helmet to confirm whether the worker is in a climbing state. The smart bracelet obtains the worker's vital sign data through a sensor to grasp the worker's life characteristic status, and obtains the worker's gravity acceleration data through a vest, as well as whether the worker is wearing a smart safety rope, to determine whether the worker is wearing protective measures and whether a fall has occurred, thereby solving the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a worker climbing judgment system, comprising: The work monitoring unit includes a safety helmet, a smart bracelet and a vest, which is used to obtain the work status of the on-site workers. The work status includes the climbing status, physical sign data, gravity acceleration data and whether the smart safety rope is worn; The data processing unit is used to receive the vital sign data, process and analyze the vital sign data obtained by the operation monitoring unit, analyze whether the operator has any abnormality, and transmit the analysis result to the safety management terminal. If the analysis result is abnormal, an alarm message is generated and sent to the operation monitoring unit, the safety management unit and the abnormal warning unit at the same time; The safety management unit is used to feedback the work status of the operators obtained by the operation monitoring unit. The management personnel can view the work status of the operators, the analysis results of the data processing unit, and the alarm notifications about the operators in real time. After learning that the analysis results are abnormal and the alarm notifications are generated, the management personnel can organize the rescue work for the operators in a timely manner. The abnormal warning unit is used to receive the alarm information of the data processing unit, issue a warning according to the alarm information, and send a text message notification to the management personnel to remind the operating personnel and management personnel to pay attention.

[0005] Furthermore, the operation monitoring unit, wherein: Safety helmet, which is worn on the head of the operator. Several light beams on the helmet confirm whether the operator is in the climbing state; A smart bracelet is worn on the operator's wrist to obtain the operator's vital sign data; The vest is worn on the upper body of the operator. The vest obtains the operator's gravity acceleration data and whether the operator is wearing a smart safety rope.

[0006] Furthermore, the safety helmet comprises: The detection module is used to emit several light beams for detection. The angle and speed of light are determined by several light beams to determine the specific distance and height of the operator, and the approximate area of ​​the current working platform is judged by several light beams. If the area of ​​the working platform is larger than 10 square meters, it is not a climbing work situation. If the area of ​​the working platform is larger than 10 square meters, it is confirmed to be climbing work, and the status of the climbing work is fed back.

[0007] Furthermore, the smart bracelet comprises: Blood oxygen sensor, used to measure the blood oxygen data of workers in real time; Heartbeat sensor, used to measure the heartbeat data of operators in real time.

[0008] Furthermore, the vest comprises: Gyroscopic sensors are used to sense information related to the operator's orientation, level, position, speed and acceleration; The hanging judgment module is used to judge whether the operator is wearing the smart safety rope according to whether a communication connection is established between the vest and the smart safety rope.

[0009] Furthermore, the data processing unit comprises: A setting module, used for setting thresholds related to vital sign data in advance; The comparison module is used to receive the vital sign data obtained from the operation monitoring unit, compare the received vital sign data with the preset threshold value, determine whether there is any abnormality in the vital sign of the operator at this time, and generate an alarm message if there is an abnormality.

[0010] Furthermore, the data processing unit specifically performs the following operations: The threshold value of the vital sign data is set in advance, the vital sign data pushed by the operation monitoring unit is compared with the preset threshold value, and it is analyzed whether it exceeds the corresponding preset threshold value. When it is determined that it exceeds the corresponding preset threshold value, an alarm message is generated for notification.

[0011] Furthermore, the security management unit includes: The monitoring end is used to receive the working status of operators and alarm notifications about construction workers. Managers log in to the monitoring end through verification. The monitoring end pushes the working status and work information of operators and alarm notifications to managers, providing a query and viewing platform for managers.

[0012] Furthermore, the manager is an internal employee of the company, such as a team leader. The monitoring terminal configures security management permissions for the manager, which is used for the manager to log in to the monitoring terminal. One manager manages multiple operators.

[0013] Furthermore, the abnormal warning unit includes: The alarm module is used to receive alarm information and issue various types of warning notifications according to the alarm information to remind operators and managers to pay attention; The warning notices are: Light warning, including warning lights, which are installed on the vest and use flashing lights to warn; Sound warning, including an external speaker, which is placed in the machine room of the safety management unit, uses sound playback to alarm, and plays the working status and abnormal results of the operator; SMS alerts are used to send SMS messages to managers' handheld terminals to remind them of abnormalities in operators.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The work monitoring unit of the present invention comprises a safety helmet, in which a detection module is arranged. The detection module emits a plurality of light beams for detection, and determines the angle and the speed of light according to the emitted plurality of light beams, so as to determine the specific distance and height of the operator. At the same time, the approximate area of ​​the current working platform is judged by a plurality of light beams, and confirmed according to the light beams and the calculation formula, so as to confirm whether the current operator is in a state of high-altitude work, which is convenient for on-site managers to effectively monitor the working status of the operators.

[0015] 2. The operation monitoring unit of the present invention also includes a smart bracelet and a vest. The smart bracelet measures the blood oxygen data of the operator in real time through a blood oxygen sensor, and measures the heartbeat data of the operator in real time through a heartbeat sensor. The blood oxygen data and the heartbeat data are the vital signs data of the operator, which is convenient for the management personnel to grasp the life characteristics of the operator in real time, so that when the operator feels unwell, the management personnel can take measures against the operator in time. The vest senses the relevant information of the orientation, level, position, speed and acceleration of the operator through a gyroscope sensor to determine whether the operator has fallen. The connection judgment module confirms whether a communication connection is established between the vest and the smart safety rope to determine whether the operator is wearing the smart safety rope. By monitoring whether the operator is wearing protective measures and whether a fall occurs, the management personnel can supervise the safety of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the operation monitoring unit of the present invention; Figure 3 It is a structural schematic diagram of a data processing unit of the present invention; Figure 4 It is a schematic diagram of the overall process of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0018] In order to solve the technical problem that the existing on-site full-time management personnel are difficult to control safety, when the workers climb to a certain height, they are far away from the full-time management personnel, making it difficult for the management personnel to effectively monitor the workers' work behavior. In addition, the workers may feel unwell due to the high-altitude work, and the management personnel cannot grasp the workers' vital characteristics data in real time, thus posing a great hidden danger to the safety of the workers. Please refer to Figure 1-Figure 4 , this embodiment provides the following technical solutions: Worker height judgment system, including: The operation monitoring unit, including a safety helmet, an intelligent bracelet and a vest, is used to obtain the working status of on-site workers. The working status includes the climbing status, physical sign data, gravitational acceleration data, and whether the intelligent safety rope is worn; The data processing unit is used to receive the physical sign data, process and analyze the physical sign data obtained by the operation monitoring unit, analyze whether there is any abnormality in the workers, and transmit the analysis result to the safety management terminal. If the analysis result shows an abnormality, an alarm message will be generated and sent to the operation monitoring unit, the safety management unit and the abnormal warning unit at the same time; The safety management unit is used to feed back the working status of the workers obtained by the operation monitoring unit. The management personnel can view the working status of the workers, the analysis result of the data processing unit and the alarm notification about the workers in real time. After learning that the analysis result is abnormal and the generated alarm notification, they will promptly organize and carry out the rescue work for the workers; The abnormal warning unit is used to receive the alarm message from the data processing unit, give a warning according to the alarm message, and send a text message notification to the management personnel to remind the workers and the management personnel to pay attention.

[0019] The working principle of the above content: The operation monitoring unit obtains the climbing status, physical sign data, gravitational acceleration data, and whether the intelligent safety rope is worn of the workers through the safety helmet, the intelligent bracelet and the vest. The information of the climbing status, physical sign data, gravitational acceleration data, and whether the intelligent safety rope is worn of the workers is pushed to the safety management unit, which is convenient for the management personnel to query and view the status of the workers. And the obtained physical sign data will also be sent to the data processing unit for comparison and analysis to judge whether the vital signs of the workers are abnormal at this time. The abnormal result will also generate an alarm message and send it to the abnormal warning unit for notification.

[0020] The operation monitoring unit, among which, The safety helmet is used to be worn on the head of the worker. Several light beams on the safety helmet confirm whether the worker is in the climbing status; The intelligent bracelet is used to be worn on the wrist of the worker. The intelligent bracelet obtains the physical sign data of the worker; The vest is used to be worn on the upper body of the worker. The vest obtains the gravitational acceleration data of the worker and whether the worker wears the intelligent safety rope.

[0021] The technical effects of the above contents are as follows: the climbing status of the workers can be obtained through the safety helmet, which is convenient for the management personnel to supervise the climbing work of the workers; the vital signs data of the workers can be measured through the smart bracelet, which is convenient for the management personnel to grasp the vital signs status of the workers in real time; the gravity acceleration data of the workers and whether the workers are wearing smart safety ropes can be obtained through the vest, which is convenient for the management personnel to grasp the safety status of the workers in real time. Through the above-mentioned safety helmets, smart bracelets and vests, the management personnel can effectively monitor the work behavior of the workers and monitor the various status of the workers, thereby further ensuring the safety of the workers.

[0022] Safety helmet, including: The detection module is used to emit several light beams for detection. The angle and speed of light are determined by several light beams to determine the specific distance and height of the operator, and the approximate area of ​​the current working platform is judged by several light beams. If the area of ​​the working platform is larger than 10 square meters, it is not a climbing work situation. If the area of ​​the working platform is larger than 10 square meters, it is confirmed to be climbing work, and the status of the climbing work is fed back.

[0023] The technical effect of the above content: the safety helmet can use the detection module to emit several light beams for detection. The light beam is a return light beam, and several light beams are used to eliminate the possibility of problems with a single light beam and improve the accuracy of monitoring. The safety helmet determines the angle and speed of light through several light beams to determine the specific distance and height of the operator. At the same time, it judges the approximate area of ​​the current working platform through several light beams, and confirms whether the operator is currently in a climbing state based on the area of ​​the working platform.

[0024] In one embodiment, when an operator is working, the safety helmet first determines the distance between the current operator and the work platform and the area of ​​the work platform by emitting a number of light beams and returning light beams. At this time, if the distance to the work platform is 1 meter and the area of ​​the work platform is greater than 10 square meters, the operator is not considered to be working at height. When the operator goes up a certain height, at this time, if the distance to the work platform is 5 meters and the area of ​​the work platform is less than 10 square meters, it is confirmed that the operator is working at height, and the climbing status is fed back to the safety management unit.

[0025] Smart bracelet, including: Blood oxygen sensor, used to measure the blood oxygen data of workers in real time; Heartbeat sensor, used to measure the heartbeat data of operators in real time.

[0026] Technical effects of the above content: the smart bracelet can collect the blood oxygen data and heart rate data of the workers through the blood oxygen sensor and the heart rate sensor respectively. The blood oxygen sensor adopts the photoelectric method, that is, the arteries usually pulsate continuously, and during contraction and relaxation, with the increase and decrease of blood flow, they absorb light to different degrees. The ratio of light absorption in the contraction and relaxation stages is converted into a blood oxygen saturation measurement value by the instrument. The heart rate sensor is based on the principle of photoelectric capacitance pulse wave. The heart rate sensor measures the changes in the amount of blood passing through any organ of the body. The measured blood oxygen data and heart rate data can facilitate management personnel to understand the physical condition of the workers.

[0027] Vest, including: Gyroscopic sensors are used to sense information related to the operator's orientation, level, position, speed and acceleration; The hanging judgment module is used to judge whether the operator is wearing the smart safety rope according to whether a communication connection is established between the vest and the smart safety rope.

[0028] The technical effect of the above content: the vest can sense the relevant information of the operator's orientation, level, position, speed and acceleration through the gyroscope sensor and send it to the safety management unit at the same time, and judge whether the operator has fallen or tipped over based on the sensed relevant information. The hanging judgment module can judge whether the operator is wearing a smart safety rope. If a communication connection is established between the vest and the smart safety rope, it can be judged that the operator is currently hanging with a smart safety rope. If no communication connection is established between the vest and the smart safety rope, it can be judged that the operator is not currently hanging with a smart safety rope, and the judgment result that the smart safety rope is not hanging is sent to the safety management unit. The management personnel remind the operator to take protective measures based on the judgment result.

[0029] Data processing unit, including: A setting module, used for setting thresholds related to vital sign data in advance; The comparison module is used to receive the vital sign data obtained from the operation monitoring unit, compare the received vital sign data with the preset threshold value, determine whether there is any abnormality in the vital sign of the operator at this time, and generate an alarm message if there is an abnormality.

[0030] The data processing unit specifically performs the following operations: The threshold value of the vital sign data is set in advance, the vital sign data pushed by the operation monitoring unit is compared with the preset threshold value, and it is analyzed whether it exceeds the corresponding preset threshold value. When it is determined that it exceeds the corresponding preset threshold value, an alarm message is generated for notification.

[0031] Technical effects of the above content: The physical sign data are blood oxygen data and heart rate data. The threshold of blood oxygen is 95%-100%, and the threshold of heart rate is 60-100 beats. The blood oxygen data and heart rate data measured by the smart bracelet are analyzed with the set thresholds. When any one of the data exceeds the preset threshold, an alarm notification is immediately sent.

[0032] The safety management unit includes: The monitoring terminal is used to receive the working status of the operators and the alarm notifications regarding the construction operators. The management personnel log in to the monitoring terminal through verification. The monitoring terminal pushes the working status, working information, and alarm notifications of the operators to the management personnel, providing a platform for the management personnel to query and view.

[0033] The management personnel are internal employees of the company, such as team leaders. The monitoring terminal configures safety management permissions for the management personnel to log in to the monitoring terminal. One management personnel corresponds to managing multiple operators.

[0034] Technical effects of the above content: The monitoring terminal provides a platform for the management personnel to query and view. The operators can view the climbing status of the operators monitored by the safety helmets through the monitoring terminal. The blood oxygen data and heart rate data measured by the smart bracelet are also displayed on the monitoring terminal, and the abnormal results of blood oxygen and heart rate after comparison by the data processing unit are also displayed. The vest senses the relevant information of the operator's orientation, level, position, speed, and acceleration, and the judgment result that the operator does not hang the intelligent safety rope is also displayed on the monitoring terminal, facilitating the management personnel to effectively monitor the operators in real time.

[0035] The abnormal warning unit includes: The alarm module is used to receive alarm information and send various types of warning notifications according to the alarm information to remind the operators and management personnel to pay attention. Among them, the warning notifications are respectively: The light warning includes warning lights. The warning lights are installed on the vest and use the flashing of the lights for alarm. The lights flash 5-10 times, and the light color is red. The sound warning includes an external speaker. The external speaker is placed in the computer room of the safety management unit and uses sound playback for alarm. The working status and abnormal results of the operators are played, and the decibel of the sound playback is 120dB-150dB. The SMS warning is used to send SMS information to the handheld terminals of the management personnel to remind the management personnel to pay attention to the abnormalities of the operators.

[0036] The technical effect of the above content: the abnormal warning unit can play a warning role to remind management personnel to pay attention to the abnormal state of the operating personnel, so that management personnel can make rescue in time; in one embodiment, if the operating personnel is in a state of climbing and has abnormal vital sign data, but has not fallen, the alarm module activates the warning light on the vest to issue a light warning to remind the operating personnel to pay attention to their physical condition, and at the same time starts the external speaker at the monitoring end to play sound to remind management personnel to pay attention. If the operating personnel is in a state of climbing and has fallen, not only will sound and light warnings be issued at the same time, but text message notifications will be sent to management personnel, and management personnel can use this to contact the on-site supervisor to immediately contact the rescue team for real-time rescue.

[0037] Example 1: At about 2 p.m. one day, Zhao, an on-site worker, was working. The safety helmet detected that Zhao was working at height. Zhao was in good health and had rich work experience. After working at height for half an hour, Zhao did not feel any discomfort. However, the blood oxygen data collected by the smart bracelet worn by Zhao showed that he was in a state of hypoxia and triggered an alarm, notifying Zhao to evacuate. In order to complete the work as soon as possible and feel good about himself, Zhao ignored the alarm notification. The manager discovered through the safety management unit that Zhao was evacuating and contacted the on-site supervisor to force Zhao to evacuate, thus avoiding an accident.

[0038] Example 2: In the summer, Wang, a field worker in a certain area, was working at height. The safety helmet detected that Wang was working at height. Due to the hot summer weather and fatigue caused by working in the afternoon, Wang suddenly felt dizzy and accidentally fell from a height. After the manager discovered this through the alarm notification of the safety management unit, he immediately called the on-site supervisor remotely. The on-site supervisor immediately contacted the rescue team to launch a rescue. Finally, due to the timely rescue, no death occurred.

[0039] Working principle: The operation monitoring unit includes a safety helmet, a smart bracelet and a vest. The safety helmet emits several light beams for detection through the detection module, so as to confirm whether the current operator is in a state of high-altitude work, which is convenient for on-site managers to effectively monitor the working status of the operators. The smart hand measures the blood oxygen data and heart rate data of the operators, which is convenient for managers to grasp the vital characteristics of the operators in real time. The vest obtains the gravity acceleration data of the operators and whether the operators are wearing smart safety ropes. Through the above-mentioned safety helmets, smart bracelets and vests, managers can effectively monitor the operating behaviors of the operators and monitor the various states of the operators, further ensuring the safety of the operators. The monitoring end of the safety management unit provides managers with a query and viewing platform, so that managers can grasp the working status of the operators in real time, and the abnormal warning unit can play a warning role to remind managers to pay attention to the abnormal state of the operators, so that managers can rescue in time.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Worker climbing judgment system, It is characterized in that include: The work monitoring unit includes a safety helmet, a smart bracelet and a vest, which is used to obtain the work status of the on-site workers. The work status includes the climbing status, physical sign data, gravity acceleration data and whether the smart safety rope is worn; The data processing unit is used to receive the vital sign data, process and analyze the vital sign data obtained by the operation monitoring unit, analyze whether the operator has any abnormality, and transmit the analysis result to the safety management terminal. If the analysis result is abnormal, an alarm message is generated and sent to the operation monitoring unit, the safety management unit and the abnormal warning unit at the same time; The safety management unit is used to feedback the work status of the operators obtained by the operation monitoring unit. The management personnel can view the work status of the operators, the analysis results of the data processing unit, and the alarm notifications about the operators in real time. After learning that the analysis results are abnormal and the alarm notifications are generated, the management personnel can organize the rescue work for the operators in a timely manner. The abnormal warning unit is used to receive the alarm information of the data processing unit, issue a warning according to the alarm information, and send a text message notification to the management personnel to remind the operating personnel and management personnel to pay attention.

2. The worker climbing height judgment system according to claim 1, Features: The operation monitoring unit, wherein: Safety helmet, which is worn on the head of the operator. Several light beams on the helmet confirm whether the operator is in the climbing state; A smart bracelet is worn on the operator's wrist to obtain the operator's vital sign data; The vest is worn on the upper body of the operator. The vest obtains the operator's gravity acceleration data and whether the operator is wearing a smart safety rope.

3. The worker climbing height judgment system according to claim 1, Features: The safety helmet comprises: The detection module is used to emit a plurality of light beams for detection, and determine the angle and light speed through a plurality of light beams to determine the specific distance and height of the operator, and judge the area of ​​the current working platform through a plurality of light beams.

4. The worker climbing height judgment system according to claim 1, Features: The smart bracelet comprises: Blood oxygen sensor, used to measure the blood oxygen data of workers in real time; Heartbeat sensor, used to measure the heartbeat data of operators in real time.

5. The worker climbing height judgment system according to claim 1, Features: The vest comprises: Gyroscopic sensors are used to sense information related to the operator's orientation, level, position, speed and acceleration; The hanging judgment module is used to judge whether the operator is wearing the smart safety rope according to whether a communication connection is established between the vest and the smart safety rope.

6. The worker climbing height judgment system according to claim 1, Features: The data processing unit comprises: A setting module, used for setting thresholds related to vital sign data in advance; The comparison module is used to receive the vital sign data obtained from the operation monitoring unit, compare the received vital sign data with the preset threshold value, determine whether there is any abnormality in the vital sign of the operator at this time, and generate an alarm message if there is an abnormality.

7. The worker climbing height judgment system according to claim 1, Features: The data processing unit specifically performs the following operations: The threshold value of the vital sign data is set in advance, the vital sign data pushed by the operation monitoring unit is compared with the preset threshold value, and it is analyzed whether it exceeds the corresponding preset threshold value. When it is determined that it exceeds the corresponding preset threshold value, an alarm message is generated for notification.

8. The worker climbing height judgment system according to claim 1, Features: The security management unit comprises: The monitoring end is used to receive the working status of operators and alarm notifications about construction workers. Managers log in to the monitoring end through verification. The monitoring end pushes the working status and work information of operators and alarm notifications to managers, providing a query and viewing platform for managers.

9. The worker climbing height judgment system according to claim 8, Features: The monitoring terminal is configured with security management permissions for management personnel, which are used for management personnel to log in to the monitoring terminal. One management personnel is responsible for managing multiple operating personnel.

10. The worker climbing height judgment system according to claim 1, Features: The abnormal warning unit comprises: The alarm module is used to receive alarm information and issue various types of warning notifications according to the alarm information to remind operators and managers to pay attention; The warning notices are: Light warning, including warning lights, which are installed on the vest and use flashing lights to warn; Sound warning, including an external speaker, which is placed in the machine room of the safety management unit, uses sound playback to alarm, and plays the working status and abnormal results of the operator; SMS alerts are used to send SMS messages to managers' handheld terminals to remind them of abnormalities in operators.

Images