CN108805774B - Campus electronic class board and class-walking class-arranging system and method - Google Patents

Campus electronic class board and class-walking class-arranging system and method Download PDF

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Publication number
CN108805774B
CN108805774B CN201810921998.7A CN201810921998A CN108805774B CN 108805774 B CN108805774 B CN 108805774B CN 201810921998 A CN201810921998 A CN 201810921998A CN 108805774 B CN108805774 B CN 108805774B
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Prior art keywords
class
classroom
electronic
communication module
board
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CN108805774A (en
CN108805774B8 (en
Inventor
刘志宁
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Zhejiang Yifei Information Technology Co ltd
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Zhejiang Yifei Information Technology Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/10—Services
    • G06Q50/20—Education
    • G06Q50/205—Education administration or guidance
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/16—Human faces, e.g. facial parts, sketches or expressions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/16—Human faces, e.g. facial parts, sketches or expressions
    • G06V40/161—Detection; Localisation; Normalisation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention relates to a campus electronic class board and a class-walking and course-arranging system and method, wherein the system comprises an electronic class board arranged on the outer wall of a classroom and a camera arranged in the classroom, and the electronic class board comprises: the communication module is communicated with the camera; the display screen is arranged on the front surface of the electronic ban board; the radio frequency identification module is arranged in the electronic ban board; the controller is respectively connected with the communication module, the display screen and the radio frequency identification module; the thermal printer is arranged on one side of the electronic ban board and is communicated with the communication module. The invention provides a multifunctional electronic class board which is communicated with a camera in a classroom, and can acquire images in the classroom, so that the images in the classroom can be watched on the electronic class board; the thermal printer is arranged on one side of the electronic ban board, so that a school timetable or notification printing can be realized, and more demands of users are met.

Description

Campus electronic class board and class-walking class-arranging system and method
Technical Field
The invention relates to the technical field of intelligent campuses, in particular to an electronic class board and class-walking class-arranging system and method for an intelligent campus.
Background
The electronic ban (intelligent ban) is one of the systems of the current campus culture construction and digital construction, and is a good application carrier for realizing intelligent campus such as daily work of schools, class culture display, expansion of classroom communication and the like. Each class is provided with one information technology environment which is arranged at the entrance of the classroom, so that the integral information technology environment of the school is greatly enriched, the perfect integration of daily work and environment beautification of the school is realized, and a high-quality carrier is provided for all-round cultivation and establishment of a campus culture environment. The current electronic class cards generally comprise an Android main board and a touch screen, are mostly used for displaying class information, current course information, class activity information and notification information of schools, have single functions, and cannot provide more comprehensive services.
Disclosure of Invention
The invention provides an intelligent campus electronic class board, a class-walking class-arranging system and a class-walking class-arranging method, and aims to overcome the defects in the prior art.
In order to achieve the above object, the present invention has the following constitution:
this wisdom campus electron ban tablet and walk ban and arrange class system, including setting up in the electron ban tablet of classroom outer wall and setting up in the inside camera in classroom, electron ban tablet includes:
the communication module is communicated with the camera;
the display screen is arranged on the front surface of the electronic ban board;
the radio frequency identification module is arranged in the electronic ban board;
the controller is respectively connected with the communication module, the display screen and the radio frequency identification module;
the thermal printer is arranged on one side of the electronic ban board and is communicated with the communication module;
a sliding rail is arranged between the right side of the electronic class board and the outer wall of the classroom, one side of the thermal printer is provided with a sliding block, the sliding block is embedded in the sliding rail, the sliding rail extends along the horizontal direction and protrudes out of the right side of the electronic class board, two ends of the sliding rail are respectively provided with a limiting block, and the thermal printer can slide on the sliding rail;
the upper side of the electronic class board and the position corresponding to the sliding rail are provided with a rain shelter, and the width of the rain shelter is larger than that of the thermal printer.
Optionally, the system further comprises a weight sensor disposed on each seat, the weight sensor in communication with the communication module.
Optionally, the system further comprises a temperature sensor arranged in the classroom, and the temperature sensor communicates with the communication module;
the system also includes a humidity sensor disposed within the classroom, the humidity sensor in communication with the communication module.
Optionally, the slide rail is the rack slide rail, the slider is the gear slide, the slider still is connected to a driving motor, driving motor with communication module communicates, during driving motor corotation, the slider is followed the slide rail slides to the right side, during driving motor reversal, the slider is followed the slide rail slides to the left, the slider pass through a fixed axle with thermal printer is connected, the fixed axle with thermal printer fixed connection, the slider rotationally overlaps to be located on the fixed axle.
Optionally, the communication module includes a SIM card slot and a 4G communication circuit, where the SIM card slot is connected to the 4G communication circuit;
the system also comprises a user terminal, wherein the user terminal is communicated with the communication module;
the system further comprises a cloud server, and the cloud server is communicated with the communication module.
Optionally, an infrared thermometer is further arranged on the front surface of the electronic ban board, and the infrared thermometer is connected with the controller;
the height of the infrared thermometer from the ground is 1.5-1.8 meters.
The embodiment of the invention also provides an intelligent campus electronic class board and a class-walking class-arranging method, which are adopted, and the system also comprises a cloud server, and the method comprises the following steps:
the controller collects images in the classroom through the camera and sends the images to the cloud server;
the cloud server analyzes the images in the classroom, identifies a podium area and extracts podium area images;
the cloud server judges whether a face image exists in the platform region image or not;
if so, the cloud server identifies the identity of the user in the face image;
if the cloud server receives images in the classrooms within a preset time period, wherein the images in the classrooms contain face images of the same user, and the identity of the user is the identity of a teacher, the cloud server judges that the current classrooms have lessons, and determines course contents according to the identity of the teacher;
the cloud server judges whether curriculum schedule exists in the current time period in the cloud class table of the classroom, and whether the curriculum schedule is consistent with the determined curriculum content, if not, the cloud server updates the cloud class table of the classroom;
if the cloud end class list of the classroom is updated, the cloud end server sends the cloud end class list to a corresponding controller of the electronic class board;
the controller controls the display screen to display the current class list;
when the controller receives a text form printing request input by a user in a display screen, the printer is controlled to print the latest text form;
when the controller identifies the radio frequency electronic tag of the user through the radio frequency reader, the identification data of the radio frequency electronic tag is sent to the cloud server;
and the cloud server determines the user identity according to the identification data, and records the identified time and the user identity to a cloud attendance record of the classroom.
Optionally, the system further comprises a weight sensor disposed on each seat, the weight sensor in communication with the communication module;
the method further comprises the steps of:
the controller acquires detection data of each weight sensor through the communication module;
the controller judges whether the seat is occupied or not according to the detection data of each weight sensor;
the controller counts the number of seats with persons and the number of seats without persons in the classroom, and displays the counted number of seats with persons and the number of seats without persons on the display screen.
The intelligent campus electronic class board, the class-walking class-arranging system and the method have the following beneficial effects:
(1) The multifunctional electronic class board is communicated with the camera in the classroom, so that the image in the classroom can be obtained, and the image in the classroom can be watched on the electronic class board; the thermal printer is arranged on one side of the electronic ban board, so that a school timetable or notification printing can be realized, and more requirements of users are met;
(2) The thermal printer can be arranged on one side of the electronic ban plate through the sliding block and the sliding rail structure in a sliding manner, can be taken out when in use, can be stored on the back of the electronic ban plate when not in use, can realize the rainproof and sun-proof protection of the thermal printer through the rain shelter on the upper side of the electronic ban plate, can further be provided with a driving motor, and can automatically drive the thermal printer to be retracted or taken out, so that the use experience of a user is improved.
Drawings
FIG. 1 is a schematic diagram of an intelligent campus electronic class board and class-walking class-arranging system according to an embodiment of the invention;
FIG. 2 is a top view of an electronic ban board according to an embodiment of the invention;
FIG. 3 is a block diagram of an intelligent campus electronic class board and class-walking and class-arranging system according to an embodiment of the invention;
fig. 4 is a flowchart of updating a class chart in the intelligent campus electronic class board and the class-walking class-arrangement method according to an embodiment of the invention.
Reference numerals:
1 electronic class card
11 rain shelter
12 display screen
13 radio frequency identification module
14 communication module
15 controller
16 infrared thermometer
17 slide rail 171 stopper
21 slide block of 2 thermal printer
3 camera
Detailed Description
In order to more clearly describe the technical contents of the present invention, a further description will be made below in connection with specific embodiments.
As shown in fig. 1 to 3, in order to solve the technical problems in the prior art, the invention provides an intelligent campus electronic class board 1 and a class-walking class-arranging system, which comprises the electronic class board 1 arranged on the outer wall of a classroom and a camera 3 arranged in the classroom, wherein the electronic class board 1 comprises:
the communication module 14 is in communication with the camera 3, and the communication module may be a WIFI wireless network card or a 4G (fourth generation mobile phone mobile communication standard) communication module 14, a 3G (third generation mobile phone mobile communication standard) communication module 14, a CDMA (Code Division Multiple Access ) communication module 14, a GPRS (General Packet Radio Service ) communication module 14, etc., which may be selected according to the need;
the display screen 12 is disposed on the front surface of the electronic shift board 1, and the display screen 12 may be an OLED (Organic Light-Emitting Diode) display screen 12 or a liquid crystal display screen 12, and is preferably a touch display screen 12;
the radio frequency identification module 13 is arranged in the electronic class board 1 and can identify radio frequency electronic tags of users to perform attendance checking of students and/or teachers;
the controller 15 is respectively connected with the communication module 14, the display screen 12 and the radio frequency identification module 13;
a thermal printer 2 disposed on one side of the electronic ban board 1, the thermal printer 2 communicating with the communication module 14;
therefore, the invention provides the multifunctional electronic ban board 1 which is communicated with the camera 3 in the classroom, and can acquire the image in the classroom, thereby realizing the watching of the image in the classroom on the electronic ban board 1; the thermal printer 2 is arranged on one side of the electronic class board 1, so that the school timetable or notification printing can be realized, and more demands of users are met.
As shown in fig. 2, a sliding rail 17 is disposed between the right side of the electronic ban board 1 and the classroom outer wall, a sliding block 21 is disposed on one side of the thermal printer 2, the sliding block 21 is embedded in the sliding rail 17, the sliding rail 17 extends along the horizontal direction, the sliding rail 17 protrudes from the right side of the electronic ban board 1, two ends of the sliding rail 17 are respectively provided with a limiting block 18, and the thermal printer 2 can slide on the sliding rail 17; the thermal printer 2 can be slid to one side when in use, and the thermal printer 2 can be taken up after use.
The upper side of the electronic class board 1 is provided with a rain shelter 11 at a position corresponding to the sliding rail 17, and the width of the rain shelter 11 is larger than that of the thermal printer 2. When the thermal printer 2 is stored on the back of the electronic ban board 1, the canopy 11 can shield it.
In this embodiment, the system further includes weight sensors disposed on each seat, in communication with the communication module 14, which detect the weight of the user when the user is sitting on the seat, and can determine that the seat is currently occupied.
In this embodiment, the system further includes a temperature sensor disposed within the classroom, the temperature sensor in communication with the communication module 14; the system also includes a humidity sensor disposed within the classroom, which is in communication with the communication module 14. The display 12 may further display data detected by the temperature sensor and the humidity sensor.
In this embodiment, the sliding rail 17 is a rack sliding rail 17, the sliding block 21 is a gear sliding block 21, the sliding block 21 is further connected to a driving motor, the driving motor communicates with the communication module 14, when the driving motor rotates forward, the sliding block 21 slides along the sliding rail 17 to the right side, when the driving motor rotates backward, the sliding block 21 slides along the sliding rail 17 to the left side, the sliding block 21 is connected with the thermal printer 2 through a fixed shaft, the fixed shaft is fixedly connected with the thermal printer 2, and the sliding block 21 is rotatably sleeved on the fixed shaft. The sliding block 21 can be automatically driven to move on the sliding rail 17 through the driving motor, a user only needs to input a printing school timetable or a printing notification request in a touch manner on the touch screen, and the driving motor can automatically drive the thermal printer 2 to move out, so that the printing of the school timetable or the notification is automatically completed.
In this embodiment, the communication module 14 includes a SIM card slot and a 4G communication circuit, the SIM card slot being connected to the 4G communication circuit; correspondingly, if the communication module 14 is a 3G communication module 14, a SIM card slot and a 3G communication circuit are included, and if it is a CDMA communication module 14, a CDMA communication circuit and the like are included; the system further comprises a user terminal in communication with the communication module 14. The user may interact with the controller 15 directly through the user terminal. The system also includes a cloud server in communication with the communication module 14.
In this embodiment, the front surface of the electronic ban board 1 is further provided with an infrared thermometer 16, and the infrared thermometer 16 is connected with the controller 15; the infrared thermometer 16 is 1.5-1.8 m away from the ground, so that students or teachers can conveniently measure the forehead temperature, can measure the body temperature of users before entering a classroom, and can send out a prompt if the body temperature is too high.
As shown in fig. 4, the embodiment of the invention further provides an intelligent campus electronic class board and a class-walking class-arranging method, the intelligent campus electronic class board and the class-walking class-arranging system are adopted, the system further comprises a cloud server, and the method comprises the following steps:
the controller collects images in the classroom through the camera and sends the images to the cloud server;
the cloud server analyzes the images in the classroom, identifies a podium area and extracts podium area images; the recognition process can adopt a trained platform region training model, during training, photos of the platform regions of each classroom at multiple angles are input into a training set, the platform regions are marked in the multiple photos in the training set respectively, and the training is carried out by adopting an existing ASM (Active Shape Model) model or a machine learning model such as a support vector machine and the like to obtain a trained platform region training model;
the cloud server judges whether a face image exists in the platform region image or not;
if the user identification information exists, the cloud server identifies the identity of the user in the face image, the identity identification can be performed through image comparison or a trained identity identification model, and similarly, the identity identification model can also be trained by adopting an existing ASM (Active Shape Model ) model or a machine learning model such as a support vector machine;
if the cloud server receives images in the classrooms within a preset time period, wherein the images in the classrooms contain face images of the same user, and the identity of the user is the identity of a teacher, the cloud server judges that the current classrooms have lessons, and determines course contents according to the identity of the teacher;
the cloud server judges whether a current time period in a cloud class table of the classroom has course arrangement or not, and whether the course arrangement is consistent with the determined course content or not, if not, the cloud server updates the cloud class table of the classroom, and if not, the course content can be added into the cloud class table;
if the cloud end class list of the classroom is updated, the cloud end server sends the cloud end class list to a corresponding controller of the electronic class board;
the controller controls the display screen to display the current class list;
when the controller receives a text form printing request input by a user in a display screen, the printer is controlled to print the latest text form;
when the controller identifies the radio frequency electronic tag of the user through the radio frequency reader, the identification data of the radio frequency electronic tag is sent to the cloud server;
and the cloud server determines the user identity according to the identification data, and records the identified time and the user identity to a cloud attendance record of the classroom.
In this embodiment, the system further includes a weight sensor disposed on each seat, the weight sensors in communication with the communication module;
the method further comprises the steps of:
the controller acquires detection data of each weight sensor through the communication module;
the controller judges whether the seat is occupied or not according to the detection data of each weight sensor;
the controller counts the number of seats with persons and the number of seats without persons in the classroom, and displays the counted number of seats with persons and the number of seats without persons on the display screen. Further, the controller can also display a seat table in the classroom, each seat in the seat table is marked with a red color if occupied by a person, a yellow color if unoccupied by a person, and the occupied ratio of the occupied seat in the classroom and the position of the vacant space can be clearly seen through the seat table.
In addition, because the communication module can acquire the image of camera in real time, can show the image of camera on the display screen in real time through the controller control to can further set up the microphone in the classroom inside, set up the audio amplifier on the electronic class tablet, play the inside sound of classroom. If a class is particularly popular, students who wish to listen to the class can also look at real-time video on the display screen in the appearance of the class in case the class is already full. School administrators can also view the situation inside the classroom without entering the classroom at the time of examination.
Therefore, compared with the prior art, the intelligent campus electronic class board, the class-walking class-arranging system and the method have the following beneficial effects:
(1) The multifunctional electronic class board is communicated with the camera in the classroom, so that the image in the classroom can be obtained, and the image in the classroom can be watched on the electronic class board; the thermal printer is arranged on one side of the electronic ban board, so that a school timetable or notification printing can be realized, and more requirements of users are met;
(2) The thermal printer can be arranged on one side of the electronic ban plate through the sliding block and the sliding rail structure in a sliding manner, can be taken out when in use, can be stored on the back of the electronic ban plate when not in use, can realize the rainproof and sun-proof protection of the thermal printer through the rain shelter on the upper side of the electronic ban plate, can further be provided with a driving motor, and can automatically drive the thermal printer to be retracted or taken out, so that the use experience of a user is improved.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent, however, that various modifications and changes may be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims (1)

1. The utility model provides a campus electron ban tablet and walk ban and arrange class system, its characterized in that, including setting up in the electron ban tablet of classroom outer wall and setting up in the inside camera of classroom, electron ban tablet includes:
the communication module is communicated with the camera;
the display screen is arranged on the front surface of the electronic ban board;
the radio frequency identification module is arranged in the electronic ban board;
the controller is respectively connected with the communication module, the display screen and the radio frequency identification module;
the thermal printer is arranged on one side of the electronic ban board and is communicated with the communication module;
a sliding rail is arranged between the right side of the electronic class board and the outer wall of the classroom, one side of the thermal printer is provided with a sliding block, the sliding block is embedded in the sliding rail, the sliding rail extends along the horizontal direction and protrudes out of the right side of the electronic class board, two ends of the sliding rail are respectively provided with a limiting block, and the thermal printer can slide on the sliding rail;
a rain shelter is arranged on the upper side of the electronic class board and corresponds to the sliding rail, and the width of the rain shelter is larger than that of the thermal printer;
the system further includes a weight sensor disposed on each seat, the weight sensor in communication with the communication module;
the system also comprises a temperature sensor arranged in the classroom, and the temperature sensor communicates with the communication module;
the system also comprises a humidity sensor arranged in the classroom, and the humidity sensor is communicated with the communication module;
the sliding rail is a rack sliding rail, the sliding block is a gear sliding block, the sliding block is also connected to a driving motor, the driving motor is communicated with the communication module, when the driving motor rotates positively, the sliding block slides rightwards along the sliding rail, when the driving motor rotates reversely, the sliding block slides leftwards along the sliding rail, the sliding block is connected with the thermal printer through a fixed shaft, the fixed shaft is fixedly connected with the thermal printer, and the sliding block is rotatably sleeved on the fixed shaft;
the communication module comprises an SIM card slot and a 4G communication circuit, and the SIM card slot is connected with the 4G communication circuit;
the system also comprises a user terminal, wherein the user terminal is communicated with the communication module;
the system further comprises a cloud server, wherein the cloud server is communicated with the communication module;
the front surface of the electronic class board is also provided with an infrared thermometer, and the infrared thermometer is connected with the controller;
the height of the infrared thermometer from the ground is 1.5-1.8 meters;
the system also comprises a cloud server, and the method of the campus electronic class board and class-walking and course-arranging system comprises the following steps:
the controller collects images in the classroom through the camera and sends the images to the cloud server;
the cloud server analyzes the images in the classroom, identifies a podium area and extracts podium area images;
the cloud server judges whether a face image exists in the platform region image or not;
if so, the cloud server identifies the identity of the user in the face image;
if the cloud server receives images in the classrooms within a preset time period, wherein the images in the classrooms contain face images of the same user, and the identity of the user is the identity of a teacher, the cloud server judges that the current classrooms have lessons, and determines course contents according to the identity of the teacher;
the cloud server judges whether curriculum schedule exists in the current time period in the cloud class table of the classroom, and whether the curriculum schedule is consistent with the determined curriculum content, if not, the cloud server updates the cloud class table of the classroom;
if the cloud end class list of the classroom is updated, the cloud end server sends the cloud end class list to a corresponding controller of the electronic class board;
the controller controls the display screen to display the current class list;
when the controller receives a text form printing request input by a user in a display screen, the printer is controlled to print the latest text form;
when the controller identifies the radio frequency electronic tag of the user through the radio frequency reader, the identification data of the radio frequency electronic tag is sent to the cloud server;
the cloud server determines the user identity according to the identification data, and records the identified time and the user identity to a cloud attendance record of the classroom;
the system further includes a weight sensor disposed on each seat, the weight sensor in communication with the communication module;
the method further comprises the steps of:
the controller acquires detection data of each weight sensor through the communication module;
the controller judges whether the seat is occupied or not according to the detection data of each weight sensor;
the controller counts the number of seats with persons and the number of seats without persons in the classroom, and displays the counted number of seats with persons and the number of seats without persons on the display screen.
CN201810921998.7A 2018-08-14 2018-08-14 Campus electronic class board and class-walking class-arranging system and method Active CN108805774B8 (en)

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Correction item: Patentee|Address|Patent agency|Patent Agent

Correct: Guangdong Campus Guard Network Technology Co., Ltd.|Room 604, No. 15, Software Road, Tianhe District, Guangzhou, Guangdong 510000|Shaoxing Yinyue Patent Agency (General Partnership) 33285|Guo Yunmei

False: Zhejiang Yifei Information Technology Co., Ltd.|321001 Room 3-105, Building 3, Zhejiang Normal University Network Economy Pioneer Park, No. 3439, North 2nd Ring West Road, Xinshi Street, Wucheng District, Jinhua, Zhejiang Province (self declared)|Wuhu chenze Intellectual Property Agency (general partnership) 34208|Li Junjian

Number: 33-01

Page: The title page

Volume: 39

Correction item: Patentee|Address|Patent agency|Patent Agent

Correct: Guangdong Campus Guard Network Technology Co., Ltd.|Room 604, No. 15, Software Road, Tianhe District, Guangzhou, Guangdong 510000|Shaoxing Yinyue Patent Agency (General Partnership) 33285|Guo Yunmei

False: Zhejiang Yifei Information Technology Co., Ltd.|321001 Room 3-105, Building 3, Zhejiang Normal University Network Economy Pioneer Park, No. 3439, North 2nd Ring West Road, Xinshi Street, Wucheng District, Jinhua, Zhejiang Province (self declared)|Wuhu chenze Intellectual Property Agency (general partnership) 34208|Li Junjian

Number: 33-01

Volume: 39

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