KR102026797B1 - Circularly polarized patch antenna reducing the radio shadow area for the smart doorlock - Google Patents

Abstract

Disclosed is a circularly polarized patch antenna with a reduced shadow area for a smart door lock. A smart door lock system based on a patch antenna comprises: a circular patch antenna transmitting and receiving signals with a user terminal located around the smart door lock; and a control unit controlling the opening and closing of the smart door lock based on the signal received through the circular patch antenna.

Description

Circularly polarized patch antenna reducing the radio shadow area for the smart doorlock}

Embodiments of the present invention relate to a smart antenna doorlock (smart doorlock) system, more specifically, to control the opening and closing of the door lock by recognizing a user terminal approaching the smart door lock based on the directional radiation characteristics of the patch antenna. It is about technology to do.

Door lock (doorlock) is generally controlled to open and close to allow access by using an ID card or password. Such a door lock is installed at a front door of a home, a company office, and the like, and the door lock is unlocked by pressing a password or contacting an RFID card, so that a monitor who forgets a password or sneaks it to hide a password pattern is monitored. There is concern about password exposure.

Under these concerns, a technology for controlling the opening and closing of a door lock using an IoT (Internet of Things) based wireless network, that is, a smart door lock technology has been studied. Smart door lock system is a technology that controls the opening and closing automatically by recognizing a user terminal, a server, a smart door lock device connected to the network to access the smart door lock, such as a smart phone (smartphone). That is, the user does not perform a separate operation such as inputting a password or contacting an ID card, and simply accesses the smart door lock while driving a smart door lock related application installed in the user terminal to automatically authenticate the user terminal. The door lock is unlocked.

 However, in order to unlock the door lock only when the user terminal is located outside the door, the radiation characteristic of the patch antenna is important. For example, when the user terminal is located inside the door, the door lock should not be unlocked even when the application is driven and turned on. When the user terminal approaches from both sides of the door lock, that is, from the side, It should be possible to recognize this and unlock the door lock.

However, in the case of the linear patch antenna, since the radiation beam is sharply formed in the front direction, there is a situation in which it is difficult to recognize the user terminal approaching from the side. That is, there is a shaded area.

Therefore, there is a need for a smart door lock technology that can recognize a user terminal without a shadow area.

Korean Patent Laid-Open No. 10-2018-0078780 relates to a smart door lock system that can be controlled at a remote location. The door lock application is installed, and a portable terminal for transmitting user personal information, a use date, and a use time input through the door lock application, and a portable device. A management server for storing user personal information, a use date, and a use time received from the door lock application of the terminal in a database, and confirming authentication and transmitting a door driving pulse signal; And a digital door locking device for selectively performing any one of a locking operation and an unlocking operation according to the control of the door driving pulse signal.

One embodiment of the present invention is based on the radiation characteristics of the patch antenna installed in the smart door lock, while recognizing the user terminal located outside the door while excluding the recognition of the user terminal inside the door, while minimizing the shadow area user terminal It is to control the opening and closing to recognize and maintain the lock of the smart door lock.

A patch antenna-based smart door lock system, comprising: a circular patch antenna for transmitting and receiving a signal to and from a user terminal located around the smart door lock, and a controller for controlling opening and closing of the smart door lock based on a signal received through the circular patch antenna. can do.

According to one side, the circular patch antenna may exhibit a characteristic that a beam is formed in the outward direction of the door in which the smart door lock is installed, and the beam is formed below a predetermined reference level in the inward direction of the door.

According to another aspect of the present invention, the circular patch antenna forms a beam in an outward direction of the door, and has a beamwidth greater than or equal to a predetermined angle so as to detect a user terminal located in a left and right side direction based on the smart door lock. Can be formed.

According to another aspect, the circular patch antenna, a first patch (feed) in which the feed (feed), a second patch (patch) spaced apart from one surface of the first patch (patch), and the first patch The first patch may include a third patch that is spaced apart from the other side of the patch.

According to another aspect, the second patch is connected to any one of two adjacent sides of the slopes constituting the first patch, the third patch is connected to the second patch of the two surfaces It can be connected to one side other than the side.

According to another aspect, the first patch may have a rhombus shape, and the second patch and the third patch may have a '-' shape.

According to another aspect, the circular patch antenna may further include a plurality of inductors connecting the first patch and the second patch and connecting the first patch and the third patch.

In the opening and closing control method of a patch antenna-based smart door lock system, Transmitting and receiving a signal with a user terminal located around the smart door lock through a circular patch antenna, and based on the signal received through the circular patch antenna of the smart door lock And controlling the opening and closing.

According to one side, the circular patch antenna may exhibit a characteristic that a beam is formed in the outward direction of the door in which the smart door lock is installed, and the beam is formed below a predetermined reference level in the inward direction of the door.

According to another aspect of the present invention, the circular patch antenna forms a beam in an outward direction of the door, and has a beamwidth greater than or equal to a predetermined angle so as to detect a user terminal located in a left and right side direction based on the smart door lock. Can be formed.

According to another aspect, the circular patch antenna, a first patch (feed) in which the feed (feed), a second patch (patch) spaced apart from one surface of the first patch (patch), and the first patch The first patch may include a third patch that is spaced apart from the other side of the patch.

According to another aspect, the second patch is connected to any one of two adjacent sides of the slopes constituting the first patch, the third patch is connected to the second patch of the two surfaces It can be connected to one side other than the side.

According to another aspect, the first patch may have a rhombus shape, and the second patch and the third patch may have a '-' shape.

According to another aspect, each of the second patch and the third patch may be connected to the first patch through an inductor.

According to embodiments of the present invention, by communicating with the user terminal using a circular patch antenna rather than a linear patch antenna, a user terminal located outside the door while excluding the recognition of the user terminal inside the door where the smart door lock is installed. While recognizing, the user terminal approaching from the side as well as the front of the door lock can be recognized to control the opening and closing to maintain and release the lock of the smart door lock. That is, the shadow area that does not recognize the user terminal approaching the door lock from the outside of the door can be reduced or minimized.

1 is a diagram illustrating a network structure of a smart door lock system according to one embodiment of the present invention.
2 is a flowchart illustrating an opening and closing control method of a smart door lock system according to an embodiment of the present invention.
3 is a block diagram showing an internal configuration of a smart door lock system according to an embodiment of the present invention.
4 is a diagram illustrating a radiation pattern of a circular patch antenna according to an embodiment of the present invention.
5 is a diagram showing the structure of a circular patch antenna according to an embodiment of the present invention.
6 is a diagram illustrating radiation patterns of circular polarization and linear polarization according to one embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a circular polarization patch antenna with improved shaded area for a smart door lock, and a technology for controlling the opening and closing of a lock of a smart door lock. The radiation characteristic of the circular patch antenna installed in the door lock outside the door is directed toward the outside of the door. Only radiate selectively, but it relates to a technique for controlling the opening and closing of the smart door lock by designing a circular patch antenna so that the back lobe is not large and wide in the lateral direction outside the door.

In the present embodiments, “back lobe” may refer to a lobe in a circularly polarized patch antenna in a direction that is about 180 degrees apart with respect to the main lobe, which is the main direction to radiate. That is, the secondary lobe in the opposite direction to the primary lobe can be represented.

1 is a diagram illustrating a network structure of a smart door lock system according to one embodiment of the present invention.

Referring to FIG. 1, the smart door lock system 101, the user terminal 102, and the server 103 may be connected to a network. In FIG. 1, the smart door lock system 101 may represent a smart door lock locking device installed on a door.

The user terminal 102 represents a portable terminal such as a smartphone, a kids phone, and the like, and an application for opening and closing control of the smart door lock system 101 may be installed based on user authentication. For example, the application may be downloaded, installed, and run from a website provided by the server 103 or an app store (app. Store) providing the download of the application.

The user terminal 102 may pre-register login information, security information, and the like for user authentication with the server 103 through the application or the Internet / mobile Internet-based webpage. For example, the security information may be a password composed of numbers, letters, special characters, etc. set by the user individually, or may include a pattern of a specific shape. In addition, the security information may be a telephone number of a user terminal, a device unique number, or the like.

The server 103 may associate and store login information, security information, and identifier information of the smart door lock system 101 associated with the user terminal 102 in a database. Here, the identifier information of the smart door lock system 101 may include a unique number assigned at the time of manufacture of the door lock device, or may include location information (eg, GPS information) in which the door lock device is installed.

The smart door lock system 101 may include a wireless communication module for wireless communication with the server 103 and the user terminal 102. For example, the smart door lock system 101 may communicate with the server 103 via Wi-Fi in the home where the smart door lock system 101 is installed, and transmit and receive authentication related information of the user terminal 102, based on BLE (Bluetooth Low energy) communication. The opening and closing of the locking device may be controlled by detecting the user terminal 102 approaching the smart door lock system 101. For example, login information and authentication information are received from the user terminal 102 accessing the smart door lock system 101 while driving an application through a circularly polarized patch antenna disposed outside the door, and the received information is received from the server 103. ) Can be delivered. If the user authentication is successful in the server 103, the smart door lock system 101 may release the lock, and if the authentication fails, the smart door lock system 101 may maintain the lock. At this time, when authentication fails for a predetermined number of times or more, or when an attempt to forcibly open the door after an authentication failure is detected, the smart door lock system 101 may output an alarm through a speaker. In addition, the server 103 may notify the landlord's user terminal of the invader occurrence, and may transmit a message such as an intruder detection to a security office, a management room, a local jurisdiction police station, or a police box.

At this time, the circularly polarized patch antenna of the smart door lock system 101 receives information to the user terminal 102 approaching while driving the application from the outside to release the lock, and the user terminal while driving the application in the door. Even if 102 approaches, it may be designed with a radiation characteristic to keep the lock as it is without recognizing the terminal. For example, the radiation characteristics may be designed such that the UHRG of the circularly polarized patch antenna has a performance of 85% or more, and the radiation characteristics may be wider to have a wider beam width to recognize the user terminal 102 approaching in the lateral direction as well as the front direction outside the door. Can be designed. The operation of controlling the opening and closing of the smart door lock system 101 based on the circularly polarized patch antenna having such a radiation characteristic will be described in detail with reference to FIGS. 2 and 3 below.

2 is a flowchart illustrating an opening and closing control method of a smart door lock system according to an embodiment of the present invention, and FIG. 3 is a block diagram illustrating an internal configuration of a smart door lock system according to an embodiment of the present invention.

Referring to FIG. 3, the smart door lock system 300 may include a controller 310, a wireless communication module 320, and a circular patch antenna 330. Steps constituting the opening / closing control method of the smart door lock system of FIG. 2 (ie, steps 210 to 220) include a control unit 310, a wireless communication module 320, which are components of the smart door lock system 300 of FIG. It may be performed by the circular patch antenna 330. In Figures 2 and 3, based on the circular polarization patch antenna disposed on the outer surface of the door of the smart door lock installed in the door to detect and authenticate the user terminal coming to the door to unlock the door lock, the same user on the inside of the door Even if the terminal is approaching will be described based on the control to maintain the lock of the door lock.

First, in order to control the opening and closing of the door lock by the smart door lock system 300 to detect and authenticate the user terminal 301 coming to the smart door lock system 300 from the outside of the door, the user terminal 301 drives the previously downloaded application. ON state can be maintained. That is, the user terminal 301 may approach the smart door lock system 300 while the application is turned on. In this case, the wireless communication module 320 may establish a wireless communication session based on wireless communication such as WiFi with a server in order to transmit and receive information for the detection and authentication of an upcoming user terminal 301 to the smart door lock system 300. . The wireless communication module 320 may activate a Bluetooth module to transmit and receive information for authentication from the user terminal 301 through BLE communication through an application of the user terminal 301.

In step 210, when the Bluetooth module is activated, the circular patch antenna 330 may transmit / receive a signal with the user terminal 301 located around the smart door lock system 300.

For example, authentication information may be requested to the user terminal 301 through the circular patch antenna 330. Then, the user terminal 301 through the application of the user terminal 301 may transmit the authentication information of the terminal to the smart door lock system 300 in BLE communication, the wireless communication module 320 is a circular patch antenna 330 Through the authentication information can be received, the received authentication information can be delivered to the server. At this time, the identification information of the smart door lock system (for example, GPS information, etc.) together with the authentication information of the user terminal can be delivered to the server, the server is based on the identifier information of the smart door lock system and the received authentication information in the database The user terminal may be authenticated by checking whether the authentication information matching the stored identifier information of the smart door lock system matches the received authentication information.

In step 220, the controller 310 may control the opening and closing of the smart door lock based on the signal received through the circular patch antenna 330.

For example, as the server succeeds in authenticating the user terminal 301, the server may transmit information indicating the successful authentication to the user terminal 301 through an application or may transmit the information to the smart door lock system 300. Even when the authentication fails, information indicating the authentication failure may be transmitted to the user terminal 301 or the smart door lock system 300. In this case, when transmitting to the user terminal 301, the authentication success information may include security key information for releasing the lock of the smart door lock system 300, the security through the smart door lock system 300 circular patch antenna The key information may be received from the user terminal 301. Then, the control unit 310 may control the opening and closing of the door lock based on the received security key information and the security key information it already has. Here, controlling the opening and closing of the door lock based on the security key information corresponds to an embodiment, and in addition to the authentication of the user terminal based on various authentication algorithms, the opening and closing of the door lock may be controlled.

In this case, the circular patch antenna 330 has a characteristic that a beam is formed in an outer direction of the door in which the smart door lock system 300 is installed, and a beam is formed below a predetermined reference level in the inner direction of the door. Can be. That is, while forming a beam (beam) in the outer direction of the door, the beam width (broad) of a predetermined angle or more in order to detect the user terminal 301 located in the left and right side direction outside the door relative to the smart door lock system 300 beamwidth). In other words, the UHRG may satisfy the performance of 90% or more, and the radiation beam may be formed to be relatively wider than the linear patch antenna so that the beam may receive a signal of the user terminal 301 coming from the side direction.

4 is a diagram illustrating a radiation pattern of a circular patch antenna according to an embodiment of the present invention.

4, 410 may represent a radiation pattern of the linear patch antenna, and 420 may represent a radiation pattern of the circular patch antenna.

In FIG. 4, the door lock represents the smart door lock system 300 and may represent a door lock device having a locking function attached to a door. The door lock may be installed on the inner side of the door and the outer side of the door, and the inner side of the door may be a wireless communication module for wireless communication such as BLE communication and WiFi, a device for communication with a server and a user terminal, and control of information transmission and reception. Can be arranged. A circular patch antenna may be disposed on the outer surface of the door.

Referring to 420, in order to turn on the application, recognize the oncoming user terminal from the outside of the door lock to release the lock, and to unlock the door lock even if the upcoming user terminal in the inside of the door lock the application. The circular patch antenna may have a characteristic in which a radiation pattern is radiated in all directions but not radiated in the rear. That is, since the circular patch antenna is installed outside the door, it is radiated in all directions outside the door, and may have a radiation characteristic of optimizing such that the back inside the door, that is, the back lob is below a predetermined reference level. At this time, in order to detect the user terminal coming in the lateral direction, rather than a highly directional (i.e. pointed) radiation pattern, such as 410, the circular patch antenna has a wide lateral direction, such as 420, the radiation is not large back Patterns can be formed. In other words, if the back lobe is large, the signal is caught inside the door, and if the directivity in the omnidirectional direction is high, the shadow area is hard to catch the signal of the user terminal approaching in the lateral direction, so the radiation pattern of the circular patch antenna for UHRG 85% or more Is important every week.

5 is a diagram showing the structure of a circular patch antenna according to an embodiment of the present invention.

Referring to FIG. 5, the circular patch antenna 500 may include a first patch 510 in which a feed part is located and a second patch 520 connected to a surface of the first patch at a predetermined distance. The first patch may include a third patch 530 that is spaced apart from the other surface of the first patch by a predetermined distance.

For example, the circular patch antenna 500 inductors the first patch 510, the second patch 520, and the third patch 530 on a substrate 501 having a width of 68 mm and a length of 116 mm. It can be formed by connecting. Here, the inductor is a loss caused by connecting the first patch (510) and the second patch (520), the first patch (510) and the third patch (530). And impedance matching can be performed to form a desired radiation beam pattern (e.g., a wide spread and omni-directional beam width).

 The first patch 510 is formed on the substrate 501 in a rhombus shape, and may include a feed part. In addition, a second patch 520 is connected to one of two surfaces adjacent to each other among the slopes constituting the first patch 510, and a third patch 530 to the other surface. Can be connected.

In this case, the second patch 520 and the third patch 530 may be connected to the first patch 510 in a "c" shape. For example, one of the three strips 521 constituting the second patch 520 corresponds to a vertex region of one surface of the first patch 510 and an inductor. Can be connected via. The other strip 522 of the three strips constituting the second patch 520 corresponds to a vertex region close to a feed of one surface of the first patch 510. It can be connected to the part through an inductor. The middle strip of the three strips constituting the second patch 520 may connect the first strip 521 and the second strip 523.

Similarly, the first strip 531 of the three strips constituting the third patch 530 is a vertex close to the feed of one side of the first patch 510 and the neighboring surface. It may be connected through an inductor and a portion corresponding to the region. The second strip 532 of the third patch 530 has a direction opposite to a vertex region close to the feed of the vertex regions of both ends of one surface and the neighboring surface of the first patch 530. It may be connected to the vertex area through an inductor. For example, the second patch 520 and the third patch 530 may be connected to adjacent surfaces of the first patch 510 based on an area where a feed is located. Can be. That is, it may be connected to two surfaces associated with a feed of the slopes. Referring to FIG. 5, the length of connecting the first strip 521 of one surface of the first patch 510 to the first strip 521 of the second patch 520 is 24 mm and the other surface of the first patch 510 is different. The length connecting the third strip 532 of the third patch 530 may correspond to 24 mm.

6 is a diagram illustrating radiation patterns of circular polarization and linear polarization according to one embodiment of the present invention.

인 경우에 평면(plane)에서 방사 패턴(normalized gain pattern)을 측정한 것이고, 620은

인 경우에 평면(plane)에서 방사 패턴(normalized gain pattern)을 측정한 값을 나타낼 수 있다. 즉, 610은

인 경우 XY 평면에서 원형 편파(611)와 선형 편파(612)의 방사 패턴을 나타내고 있으며, 620에서

는 Z축에서 기울어진 정도를 나타낼 수 있다. 610을 참고하면, 널(null)이 선형 편파(611) 대비 원형 편파9612)가 적은 것을 확인할 수 있다. 즉, 원형 편파의 널(null)이 전체적으로 완화됨을 확인할 수 있다. 다시 말해, 빔폭이 넓게 형성되어 측면 방향에서 다가오는 사용자 단말로부터의 신호를 원형 패치 안테나가 선형 패치 안테나보다 잘 수신할 수 있음을 확인할 수 있다. 마찬가지로, 620을 참고하면, 선형 편파(621) 대비 원형 편파(622)의 널(null)이 완화되어 넓은 빔폭을(즉, 둥그렇게) 형성함을 확인할 수 있다. 즉, 방사 패턴에서 널(null)이 발생하는 지점이 원형 편파(612, 622)가 선형 편파(611, 621) 대비 확연히 개선되었음을 확인할 수 있다. 610 in FIG.

In this case, the normalized gain pattern is measured in a plane, and 620 is

In the case of, it may represent a value obtained by measuring a normalized gain pattern on a plane. That is, 610

Is the radiation pattern of the circular polarization 611 and the linear polarization 612 in the XY plane, and at 620

Can represent the degree of inclination in the Z axis. Referring to 610, it can be seen that null has a smaller circular polarization 9612 than linear polarization 611. That is, it can be confirmed that nulls of circular polarization are alleviated as a whole. In other words, it can be confirmed that the circular patch antenna can receive a signal from the user terminal coming in the lateral direction so that the beam width is wider than that of the linear patch antenna. Similarly, referring to 620, it can be seen that the null of the circularly polarized wave 622 is relaxed compared to the linearly polarized wave 621 to form a wide beam width (ie, rounded). That is, it can be confirmed that the circular polarizations 612 and 622 are significantly improved compared to the linear polarizations 611 and 621 at the point where nulls are generated in the radiation pattern.

Table 1 below may represent the radiation characteristics of the circularly polarized patch antenna.

Table 5 above may show data obtained by measuring antenna performance with a 3D OTA chamber when a circularly polarized patch antenna is applied. Referring to Table 5, it can be seen that the UHRG of the circular patch antenna satisfies the reference value of 85% or more, in which beams are formed in all directions with an average of 90% or more but also wide beam widths on both sides.

As described above, by providing a smart door lock system based on a circular patch antenna, the beam is formed so that the radio wave of the antenna does not flow into the door, but outwards, the beam is formed spreading to the side, UHRG Performance may be at least 85%, such as at least 90%. Accordingly, even when the user terminal approaches from the outside side of the door, the user terminal can be smoothly unlocked by detecting the user terminal without the shadow area.

The method according to the embodiment may be embodied 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. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, 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. 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 embodiments, and vice versa.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims (14)

In the patch antenna based smart door lock system,
Circular patch antenna for transmitting and receiving signals with the user terminal located around the smart door lock; And
Control unit for controlling the opening and closing of the smart door lock based on the signal received through the circular patch antenna
Including,
The circular patch antenna,
A first patch having a rhombus shape in which a feed is located;
A second patch connected to one surface of the first patch at a predetermined distance and having a 'c'shape;
A third patch connected to another surface of the first patch at a predetermined distance and having a 'c'shape; And
A plurality of inductors which connect the first patch and the second patch and perform impedance matching to form a desired beam pattern by connecting the first patch and the third patch.
Including,
The second patch is connected to any one of two adjacent surfaces of the slopes constituting the first patch by a plurality of inductors, and the third patch is other than the surface to which the second patch is connected. Is connected to the other side by a plurality of inductors, and forms a beam (beam) in the outward direction of the door in which the smart door lock is installed, a predetermined angle predetermined to detect the user terminal located in the left and right side direction based on the smart door lock A beamwidth is formed above, the smart door lock is radiated in an omnidirectional direction outside the door in which the smart door lock is installed so as not to detect a user terminal located inside the door, and a back lob in the inner direction of the door is provided. Being below a predetermined reference level
Smart door lock system characterized in that. delete delete delete delete delete delete In the opening and closing control method of the patch antenna based smart door lock system,
Transmitting and receiving a signal to and from a user terminal located near a smart door lock through a circular patch antenna; And
Controlling opening and closing of the smart door lock based on a signal received through the circular patch antenna
Including,
The circular patch antenna,
A first patch having a rhombus shape in which a feed is located;
A second patch connected to one surface of the first patch at a predetermined distance and having a 'c'shape;
A third patch connected to another surface of the first patch at a predetermined distance and having a 'c'shape; And
A plurality of inductors which connect the first patch and the second patch and perform impedance matching to form a desired beam pattern by connecting the first patch and the third patch.
Including,
The second patch is connected to any one of two adjacent surfaces of the slopes constituting the first patch by a plurality of inductors, and the third patch is other than the surface to which the second patch is connected. Is connected to the other side by a plurality of inductors, and forms a beam (beam) in the outward direction of the door in which the smart door lock is installed, a predetermined angle predetermined to detect the user terminal located in the left and right side direction based on the smart door lock A beamwidth is formed above, the smart door lock is radiated in an omnidirectional direction outside the door in which the smart door lock is installed so as not to detect a user terminal located inside the door, and a back lob in the inner direction of the door is provided. Being below a predetermined reference level
Opening and closing control method of the smart door lock system characterized in that. delete delete delete delete delete delete

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