KR100905550B1 - Automatic Alarm system for preventing node lefting and the method - Google Patents

Abstract

The present invention relates to a portable belongings loss prevention system to which wireless communication is added, and more particularly, to a communication distance deviation automatic warning system using a ZigBee wireless method with precise distance measurement and directionality.

To this end, the system configuration of the present invention is a node leaving automatic alarm method of the node leaving automatic alarm system in which at least one node is configured as a network having a topology with respect to the coordinator, wherein the coordinator transmits a data signal to the node. And receiving, by the node, a data signal transmitted by a coordinator, measuring a received signal strength, and transmitting the measured received signal strength value to a coordinator by including the measured data value in the data, wherein the coordinator is included in the received data. Comparing the measured data signal strength and the value measured by the coordinator with the data signal strength received from the node, performing a distance measurement based on the comparison result, and determining whether the set distance is exceeded, if the measured distance Distance deviation if exceeding the set distance And displaying the facts by the display device included in the coordinator and the node.

In addition, if the AP is installed at regular intervals and intervals, the location of the coordinator can be determined, and the location of the node to be searched can be extended to a function that can also be identified.

Description

Automatic Alarm System for Preventing Node Lefting and the Method

1 is a conceptual diagram in which one coordinator and a plurality of nodes are connected to a wireless network.

2 is a logical block diagram of a coordinator.

3 illustrates a logical block diagram of a node.

4 illustrates a logical block diagram of an AP.

5 is an operation flowchart of the coordinator.

6 is an operational flowchart of a node.

7 is a conceptual view of measuring the direction and distance of the AP installation site.

The present invention relates to a portable belongings loss prevention system to which wireless communication is added, and more particularly, to a communication distance departure automatic warning system using a ZigBee wireless method with precise distance measurement and directionality.

Zigbee is a type of two-way wireless communication that is one of the Wireless Personal Area Network (WPAN) technology. Low power, low cost, high speed short range wireless communication. As a communication protocol, it meets IEEE 802.15.4 and uses 2.4GHz, 915MHz, and 868MHz frequencies.It is 250Kbps with 16 channels at 2.4GHz, 40Kbps with 10 channels at 915MHz, and 20Kbps with 1 channel at 868MHz. Can transmit 255 devices can be connected to one wireless network to configure a wireless network with multiple devices.

Unlike other wireless communication, ZigBee has the advantages of ultra low power consumption, integrated wireless transmit / receive circuits, which can be miniaturized, and can be configured at a low price. For example, smoke detectors in buildings, The building can be managed by constructing sensors such as intrusion detection sensors, and the power consumption of the building can be managed through light control.

To date, one of the prior art wireless methods used for location services is to configure using FM or AM. It consists of a receiver and a transmitter module. In this configuration, it can be designed to communicate wirelessly, but the receiver module to receive a signal must always be active. If so, the product cannot be configured with portable low power. Batteries with limited capacity may have a problem with the service life. In addition, since the receiver and the transmitter are separated, the size increases, which is generally inconvenient to carry. And even if it was made portable, there was a lot of difficulty in measuring the distance due to the wireless characteristics of the FM or AM method.

The position determining device and the method for determining the position of the ZigBee wireless system, which is one of the related arts to date, disclose the sensitivity of the signal received from the moving object when the positioning device is connected to the moving object. It is determined whether the measured reception sensitivity is equal to or greater than a reference value, which is a reception sensitivity for driving the sensor unit, and if the reception sensitivity of the signal is greater than or equal to the reference value, the position determining device drives the sensor unit to determine the position of the moving object. Characterized in that. According to the present invention, since the sensor of the position determination device is selectively driven according to the extent to which the moving object approaches the position determination device, cost can be saved by improving the power efficiency of the position determination device. There is a lot of difficulties, so there is a problem that the accuracy of the deviation distance determination is low, so the alarm sounds too often.

A communication terminal for preventing loss / theft, which is one of the related arts, and a method according to the invention (Registration No. 10-0658199) according to the invention, is an alarm signal depending on whether a threshold distance is moved from at least one target identifier installed in a certain article. Alarm unit for generating; And a control unit which controls a call connection with a base station, and controls an alarm to be output through an output means when the alarm signal is activated by examining the alarm signal generated by the alarm unit. It is characterized in that it is notified whether the installed article deviates by more than the threshold distance. The present invention has an effect that can be distinguished from each other through a different form of alarm output for each of the target identifiers through a variety of means in the case of departure from the article attached to the target identifier, but still, as in the prior art There is a problem that the precision of the deviation distance determination is inferior.

Another invention of the distance display device of the loss prevention system using a ZigBee wireless module (registered utility model 20-0423091) is a ZigBee wireless module that is easy to apply to a loss prevention device that uses a ZigBee conventionally. It is to provide a distance display device of the loss prevention system used. Although the present invention has an effect of reducing the amount of calculation according to the distance calculation by using a lookup table that calculates the distance according to the signal strength in advance, there is still a problem in that the precision of the deviation distance determination is inferior as in the prior art.

In addition, although the application field is different, there is an invention (Publication No. 10-2006-011814) to calculate the position of the robot cleaner by measuring based on signal strength information of ZigBee-based devices. The present invention also has a problem that the precision of the deviation distance is still poor, as in the prior art.

Location information confirmation method using indoor AP using heterogeneous AP as location service using AP (Registration No. 10-0695208) provides a unique identification number from various types of beacons when a mobile communication terminal is indoors in a location-based service. It is characterized by providing a method for identifying location information indoors using a heterogeneous AP to determine the location of the mobile communication terminal by using the received information. The present invention is to identify the location of the mobile communication terminal through the identification (ID) of the beacons (AP) of various models installed in the building, so that the GPS terminal is a GPS receiving sound region, that is, the building interior space or underground If there is a space, tunnel, etc., it is possible to solve the problem of not being able to check the position, and by using beacons of various models, it is possible to distinguish between the exact position and the floor, and to expand the positioning range, but the scope of application is This invention is different from the present invention and is a possible invention when providing a location based service in a mobile communication network.

As described through the above-described inventions, the conventional Zigbees have been calculated only by measuring the strength of a simple wireless output and extracting a value to calculate only a distance. Since the intensity of the radio wave is inversely proportional to the distance, an approximate distance can be measured. However, this method has a disadvantage in that the distance measurement is not properly performed according to the surrounding environment or the strength of the battery, so a technique for increasing the reliability of the distance measurement of the loss prevention device is required. In addition, there is no invention to increase the loss prevention effect by judging not only the separation distance of the lost object to find but also its direction.

The present invention has been made to solve the problems of the prior art as described above, the present invention uses a ZigBee coordinator manages a plurality of nodes, the function of registering, deleting, updating a new node, each node is a constant It is to provide a function to generate an alarm when a deviation occurs over a distance. In addition, the node can measure the direction when the departure, so if the node is located within a certain range to display the range and direction so that the location can be easily identified.

The present invention uses a Zigbee Coordinator (Coordinator) manages a plurality of nodes (Node), the function of registering, deleting, and updating a new node, and the function to generate an alarm when each node has a deviation over a certain distance Do it. In addition, the direction can be measured so that if the node is located within a certain range to display the corresponding range and direction so that the location can be easily identified. Therefore, it can also be used for important items that should not be lost or lost, management of important documents, theft of cargo vehicles, etc.

Here, the coordinator has a function of managing each node, and has a function of maintaining network connection state by investigating deletion, registration, link state, etc. of the network link of the node.

The node is, in a word, a terminal device. The main function is to communicate with the coordinator to maintain its state and to control the device by receiving a signal from the coordinator or to receive data from the sensors and transmit the value to the coordinator.

In addition, the access point (AP) has one location information, and the AP scans the location of the node to be found in the coordinator and transmits the information of the nearest AP where the node is located to the coordinator so that the coordinator can determine the location of the node. Giving functions.

In the above-described automatic communication distance departure alarm system of the node of the present invention for achieving the object of the present invention, in the automatic node departure alarm system consisting of a network having one or more nodes topologies with respect to the coordinator, The coordinator configures a wireless network of each node, and checks the addition, removal, and status of each node, and if the coordinator detects that the node deviates from the set distance, the coordinator and the node include an indication included in the coordinator and the node. Displayed by the device. In this case, the node departure automatic alarm system further comprises a plurality of AP (Access Point), and if the location of the node exceeds the set distance whether the plurality of AP is the departure node in its service area After searching, the AP that finds the leaving node transmits its ID to the coordinator, and the coordinator detects the direction of the leaving node from the ID transmitted by the AP and displays the direction of the leaving node on the display device included in the coordinator. It is characterized by.

In addition, the node measures the received signal strength value of the data signal transmitted by the coordinator and transmits the measured received signal strength value to the coordinator including the data in the data, the coordinator is included in the data received from the node The distance is measured by performing an operation using the measured received signal strength value and the signal strength value of the data signal received from the node, and determining whether the measured distance exceeds the set distance, and determining the distance of the node. When the distance is exceeded, the fact that the deviation is displayed by the display device included in the coordinator and the node.

In this case, the operation performed by the coordinator when the distance is measured may be calculated by using an average of the measured signal intensity value included in the data received from the node and the signal strength value of the data signal received from the node. Alternatively, the operation performed by the coordinator when measuring the distance may be performed by repeatedly transmitting and receiving a plurality of data signals to measure received signal strength, and calculating a distance using an average of the plurality of measured received signal strength values. It is done.

The coordinator may be configured to calculate a ratio of a data signal successfully received by repeatedly exchanging a plurality of data signals, and to determine that the node has left when the value is less than or equal to the reference value.

In addition, after configuring the network to minimize the power consumption to extend the battery life, it is characterized by switching to SLEEP MODE after opening the communication for a specified time at a specified time. In this case, when the communication is not made, the signal is generated at the next designated time after the time designated by the node for at least n times, and when there is no response, the noise is generated by driving the buzzer as a departure.

In addition, the position of the node is displayed on the LED of the coordinator by using the position information received through the AP when the node is separated, characterized in that the user to recognize.

In addition, the ID is assigned to the coordinator in advance to directly assign a registration ID that can be managed to the coordinator, and the ID is assigned to the node by wirelessly propagating while pressing the setting button of the coordinator by first powering on the node where the ID is not assigned. The node receives an ID of a coordinator having a strong strength and stores the ID in a memory.

In addition, according to the present invention, the automatic communication distance departure alarm method of the node, the coordinator in the node departure automatic alarm method of the node departure automatic alarm system consisting of a network having one or more nodes topologically centered on the coordinator, Transmitting a data signal to a node, the node receiving a data signal transmitted by the coordinator, measuring a received signal strength, and transmitting the measured received signal strength value to the coordinator by including the data in the data; Comparing the measured data signal strength included in the received data and the value measured by the coordinator the data signal strength received from the node, to measure the distance based on the comparison result, and to determine whether the set distance is exceeded Step, if the measured distance exceeds the set distance Yiwu is characterized in that it comprises a step of displaying that a distance leaving a display device including a coordinator and a node.

In addition, it can be implemented as a computer-readable recording medium recording a program for executing the above-mentioned automatic node leaving alarm.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited to the embodiments. Like reference numerals in the drawings denote like elements.

In addition, for convenience of description, a terminal using a Zigbee communication method is described as an example of a communication terminal, but various communication methods such as Bluetooth, infrared communication (IrDA), Wi-Fi (Wireless Fidelity), home RF, and UWB ( It will be apparent to those skilled in the art that the technical idea of the present invention can be applied to wired / wireless electric and electronic devices using Ultra Wide Band).

1 is a diagram illustrating a wireless network connection conceptual diagram according to an embodiment of a communication distance deviation automatic warning system using a Zigbee wireless method according to the present invention.

As shown in Figure 1, the communication distance deviation automatic alarm system is composed of one coordinator 110, a plurality of nodes (101 ~ 104), a plurality of AP (121 ~ 128). APs may not be needed if direction to the node is not needed.

Each component will be described with reference to FIGS. 2 to 4.

2 is a diagram illustrating a logical block diagram of a coordinator.

As shown in FIG. 2, first, the coordinator 110 includes an RF unit (radio transmission receiver) 201 capable of receiving and transmitting radio waves; A distance direction measuring unit 202 for performing a distance and direction measuring function, and a central controller 203 for controlling distance and direction measurement by controlling operations of all coordinators; A buzzer and an LED processor 205 capable of controlling the buzzer and the LED; A memory unit 204 for storing the ID and data; It includes a power control unit 206 that can check the remaining amount of the battery and receive the power of the battery (not shown), and a button control unit 207 for receiving and processing the input of the button.

3 illustrates a logical block diagram of a node.

The node includes an RF unit (radio transmission receiver) 301 capable of receiving and transmitting radio waves; A distance direction measurement unit 302 for performing a distance and direction measurement function, a central control 303 for controlling distance and direction measurement by controlling operations of the entire node; A buzzer and an LED processor 305 capable of controlling the buzzer and the LED; A memory unit 304 for storing the ID and data so as to recognize the coordinator having the corresponding ID; It includes a power control unit 306 that can check the remaining amount of the battery and receive the power of the battery (not shown).

4 is a diagram illustrating a logical block diagram of an AP.

The AP includes an RF unit (radio transmission receiver) 401 capable of receiving and transmitting radio waves; A central controller 402 for controlling the operation of the entire AP component to notify the coordinator that the detached node is in its own AP region; A memory unit 403 for storing corresponding ID, location information and data; It includes a power control unit 404 that can check the remaining amount of the battery and receive the power of the battery. It has basic ZIGBEE functions and has information about its location.

The operation of each component will be described with reference to FIGS. 5 to 7.

5 shows an operation flowchart of the coordinator.

6 shows an operation flowchart of a node.

7 is a conceptual diagram illustrating a direction and distance measurement of an AP installation site.

As shown in Figure 5, the coordinator 110 has the concept of a master (Master). If the ID is managed by the manufacturer stored in the memory inside the coordinator and the power is turned on (S501) to scan the node having the ID (S502) to configure the network. The time and time of data exchange are based on the premise that when a node is registered with the same ID as the coordinator, the coordinator and the node are already promised in advance (S503). Therefore, the ALIVE signal is transmitted and received within the corresponding time and time (S504), and checks whether the corresponding node is within the set distance of the coordinator to confirm whether the departure (S505). If not separated in step S505, after the time and time to communicate thereafter is switched to the SLEEP MODE to minimize the power consumption (S506). After a predetermined time to communicate will be awake (S507), the switch to the ACTIVE MODE to send data (S508). In step S509, a check is performed after the individual communication of the ALIVE signal is transmitted and received within the corresponding time and time. If it is determined that the node is within the designated distance of the coordinator after step S509 (step S510), and checks whether there is a departure (step S510), if the step is not completed, enters step S506, and then enters the SLEEP MODE until the time and time to communicate thereafter. Switching to minimize power consumption.

If it is determined in step S505 or step S510 that the departure is determined, ALIVE data is repeatedly sent several times for a predetermined time until the next transmission time, and communication fails more than n times (for example, three times). When the buzzer is operated, the user is aware of the fact of departure through the blinking LED (S511). The number of repetitions may vary depending on the radio wave environment.In the case of open areas, the number of times is less than three times because the fluctuation of the fading according to the multipath is less than that of the city center, In a rich scattering channel environment, fading due to multipath is very severe, so in order to reduce the ping-pong effect, it is necessary to check the communication failure through three or more repetitive transmissions for accurate distance measurement. It is desirable to.

When the release button is input by the user (S512), the buzzer is stopped, and the LED is also displayed normally (S513). After that, it is converted to SLEEP MODE until the time and time for communication to minimize the power consumption.

In the present invention, the distance measuring method corrects an error in distance measurement by sending a current received signal strength value to a data when exchanging an ALIVE signal between a coordinator and a node, or receives information (success rate) of a plurality of ALIVE data. By using the method to correct the distance error.

Looking more closely at the range measurement method, the node first sends ALIVE data. Receives ALIVE data from the coordinator, checks the received intensity, compares the data of the node's signal strength among the input data, calculates the distance and corrects the error for the calculated distance. As a method of compensating the distance error, the node transmits the received intensity value when the node receives the signal transmitted by the coordinator to ALIVE data when the node responds to the coordinator, and transmits it to the signal strength when the coordinator receives it. Compare and measure the distance using the average of the two values to increase the reliability of the distance measurement. As another method, a plurality of ALIVE signals may be sent, and the reception success rate may be compared with each other and determined based on a predetermined success rate reference value. As another method, the success rate of the ALIVE signal may be continuously stored and determined as an average value of the success rate (for example, calculated as a moving average) at the present time, and when the success rate falls below a certain reference value, it may be determined that the node has left.

7 is a conceptual diagram illustrating a direction and distance measurement of an AP installation site.

As shown in FIG. 7, in order to detect the direction, the APs 703 to 707 are first installed at predetermined intervals, and when the node 702 is separated from the coordinator 701, the coordinator 701 moves to the APs 703 to 707. When requesting to send the ID of the deviated node 702, the AP sends a signal to each node 702 to search for the deviated node. The AP finds the node 702 in its service area and transmits the IDs of its APs to the coordinator 701 through multi-hopping, and the coordinator 701 receives the received APs. The coordinator 701 helps the coordinator 701 find the detached node 702 by checking the direction of the departed node 702 using the ID of the symbol and indicating the direction in which the node 702 is located. Is given. The node 702 may belong to a plurality of APs, but even in this case, the node 702 may indicate directions using AP IDs received from the plurality of APs. Alternatively, the received signal strength information of each AP may be received together with the AP ID to indicate the direction of the AP having the strongest signal.

6 shows an operation flowchart of a node.

As illustrated in FIG. 6, the method of inputting an ID of a node among the functions of the node is described first. After powering on the node (S601), it is determined whether an ID exists (S602). If the ID does not exist, the LED indicating this blinks (S603). If the coordinator is in close contact with the node and then the release button of the coordinator is pressed (S604), the node ID is updated and stored with the same ID as the coordinator (S605). The wireless network is then configured. After determining that the ID exists in step S602 or storing the ID in step S605, the departure distance of the node is calculated (S606).

If it is determined that the node is separated by moving away from the set distance (S607), if the node is not separated, the node receives information about the time and time among the data transmitted and received when the network is configured, and receives the ALIVE data only at the designated time and time. After sending it is switched to the SLEEP MODE to minimize the power consumption (S608). After the predetermined time to communicate will be awake (S609), it is switched to the ACTIVE MODE to send data (S610). In step S611, a check is made to determine whether an individual signal is transmitted and received after the ALIVE signal is transmitted within the corresponding time and time. If step S611 confirms whether the node is within the designated distance of the coordinator to check whether it is separated (S612), and if it is not separated, the buzzer stops and the LED is in a normal state (S614). After that, it is converted to SLEEP MODE until the time and time for communication to minimize the power consumption.

If it is determined in step S607 or step S612 that the node has been detached, ALIVE data is repeatedly sent several times for a predetermined time until the next transmission time, and communication n or more times (for example, 3 times) If this fails, the buzzer is operated, and the user is aware of the departure even through the blinking LED (S613). The buzzer will sound and the LED blinks continuously until the node moves within the set distance.

In the above description, the present invention has been described with reference to one coordinator and one node for ease of explanation. However, the same operation is performed even when one coordinator and a plurality of nodes are configured. When one node is added, the coordinator sends the time and time information to start the next communication to all nodes to synchronize the time to communicate.

AP functions have basic ZIGBEE functions and have information about their location. As described with reference to FIG. 7, when the coordinator requests to find the ID of the node, each AP finds the ID and delivers the ID to the coordinator through a multi-hop scheme with the AP.

The node departure automatic alarm system according to the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by specific embodiments such as specific components and the like, but the embodiments and the drawings are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from such description.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

As described above, the communication distance node departure automatic alarm system using the ZigBee wireless method with precise distance measurement and directionality according to the present invention is to determine the departure distance and direction when the object is removed to the node departure automatic alarm system using ZigBee. It can be informed that it can be applied to a safer child protection system by indicating the distance and direction when the node departure automatic alarm system is applied to the child protection system. In addition, since the distance can be measured even where the AP is not installed, there is an advantage of preventing waste by conserving resources by checking items that should not be lost such as wallets, mobile phones, laptops, and important documents.

On the other hand, the present invention can secure the position of the infant when the infant is separated in a large amusement park will have a great effect in preventing the loss. In addition, the location of the personnel in each building can be identified, so it is expected that the utilization will be great where special security is required.

Claims (12)

In a node-departure automatic alarm system composed of a network in which one or more nodes are topologies with each other around a coordinator, The coordinator configures a wireless network of each node, and checks the addition, removal, and status of each node, and if the coordinator detects that the node deviates from the set distance, the coordinator and the node include an indication included in the coordinator and the node. Mark it as a device, The apparatus further includes a plurality of access points (APs), and when the location of the node exceeds a set distance, the plurality of APs searches for the departure node in their service area and then finds the departure node. The AP transmits its ID to the coordinator, and the coordinator detects the direction of the leaving node from the ID transmitted by the AP and displays the direction of the departure node on the display device included in the coordinator. After configuring the network to minimize the power consumption to extend battery life, open communication for a specified time at a specified time, then switch to SLEEP MODE. When no communication is made, the signal is attempted more than n times during the next designated time after the designated time to the node, and when there is no response, it is regarded as a departure and drives the buzzer to generate noise. system. delete The method of claim 1, The node measures the received signal strength value of the data signal transmitted by the coordinator and transmits the measured received signal strength value to the coordinator including the data in the data, The coordinator performs a calculation using the measured received signal strength value included in the data received from the node and the signal strength value of the data signal received from the node to measure the distance, It is determined whether the measured distance exceeds the set distance, and if the position of the node exceeds the set distance, the distance deviation is displayed by the display device included in the coordinator and the node. system. The method of claim 3, wherein the operation performed by the coordinator when measuring distance is And a distance is calculated using an average of the measured received signal strength value included in the data received from the node and the signal strength value of the data signal received from the node. The method of claim 3, wherein the operation performed by the coordinator when measuring distance is And measuring a received signal strength by repeatedly transmitting and receiving a plurality of data signals, and calculating a distance using an average of the plurality of measured received signal strength values. The method of claim 1, wherein the coordinator, Computing a plurality of data signals repeatedly and repeatedly calculates the ratio of the data signal successfully received, and if the value is less than the reference value node automatic distance departure alarm system characterized in that the node has moved away. delete delete The method of claim 1, When the departure of the node using the position information received through the AP indicating the direction of the node on the coordinator LED to the user of the communication distance deviation automatic alarm system, characterized in that the user. The method of claim 1, Granting ID to the coordinator directly assigns a registration ID that can be managed to the coordinator in advance. The ID is assigned to a node by first powering on a node that has not been assigned an ID, and pressing the coordinator's setting button, the node receives an ID of the coordinator with strong radio waves and stores the ID in a memory to register the ID. Automatic alarm system deviation of the communication distance of the nodes. In the node departure automatic alarm method according to claim 1, The coordinator transmitting a data signal to a node; Receiving, by the node, a data signal transmitted by the coordinator, measuring a received signal strength, and transmitting the measured received signal strength value to the coordinator by including the data in the data; Comparing, by the coordinator, the measured data signal strength included in the received data and a value measured by the coordinator to the data signal strength received from the node; Measuring the distance based on the comparison result and determining whether the distance is exceeded; And if the measured distance exceeds the set distance, displaying the fact that the distance deviated by the display device included in the coordinator and the node. A computer-readable recording medium having recorded thereon a program for executing the method of claim 11.

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