WO2020171283A1 - 큐알코드를 이용한 자동 채점 시스템 - Google Patents
큐알코드를 이용한 자동 채점 시스템 Download PDFInfo
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- WO2020171283A1 WO2020171283A1 PCT/KR2019/004388 KR2019004388W WO2020171283A1 WO 2020171283 A1 WO2020171283 A1 WO 2020171283A1 KR 2019004388 W KR2019004388 W KR 2019004388W WO 2020171283 A1 WO2020171283 A1 WO 2020171283A1
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- 238000004519 manufacturing process Methods 0.000 claims description 24
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 238000012015 optical character recognition Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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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—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/10—Services
- G06Q50/20—Education
- G06Q50/205—Education administration or guidance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
- G06K19/06037—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking multi-dimensional coding
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/02—Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
Definitions
- the present invention relates to an automatic scoring system, and more specifically, to an automatic scoring system using a QR code.
- Patent No. 10-1648756 name of the invention: test paper recognition and scoring system, notification date: August 17, 2016
- Patent No. 10-1648756 name of the invention: test paper recognition and scoring system, notification date: August 17, 2016
- the present invention has been proposed to solve the above problems of the previously proposed methods, and when the QR code provided in the questionnaire and the answer entry section on which the user's answer is written are photographed with a user device running the automatic scoring application, the questionnaire A service providing server that stores information and answers of the user recognizes the captured QR code and the user's answer, automatically scores, and provides the scored result to the user device, so it is easy and fast and convenient without fear of leakage of correct answer or loss of correct answer sheet in advance. Its purpose is to provide an automatic scoring system using QR codes that can score questionnaires with ease.
- the service providing server calculates the user's ranking from the scoring results for the same question paper and provides it to the user device in real time, so that the user can easily grasp the level of academic achievement at the national level even without taking the mock exam.
- Another purpose is to provide an automatic scoring system using QR codes.
- a user device for driving an automatic scoring application provided on a questionnaire that requires scoring, a QR code including information on the questionnaire, and an answer writing unit located around the QR code and recording the user's answer with a camera;
- It includes a service providing server that stores the information and the correct answer of the questionnaire, recognizes the QR code taken by the user device and the answer of the user, and automatically scores using the recognition result and provides the scoring result to the user device,
- the service providing server provides server,
- a database module for storing information on the questionnaire and a correct answer to the question included in the questionnaire
- Information recognition module for recognizing the information of the question paper and the user's answer from the QR code and the answer writing unit photographed by the user device;
- a scoring module for automatically scoring a user's answer using the information of the questionnaire recognized by the information recognition module and the user's answer, and the information and correct answer of the questionnaire stored in the database module, and storing the scoring result in the database module;
- a ranking order calculation module for calculating a user's ranking from scoring results for the same question paper corresponding to the information on the question paper stored in the database module;
- a result providing module for providing the scoring result of the scoring module and the ranking of the user calculated by the ranking calculation module to the user device in real time.
- the QR code and answer writing unit Preferably, the QR code and answer writing unit,
- the answer writing unit Preferably, the answer writing unit,
- It may be configured in the form of a table according to the number of questions and question numbers included in the questionnaire.
- the information recognition module Preferably, the information recognition module, the information recognition module, and
- OCR optical character reader
- the order calculation module calculates the order of the order calculation module
- the service providing server Preferably, the service providing server,
- a QR code production module for generating a QR code corresponding to the information on the problem sheet stored in the database module and providing the generated QR code to the problem sheet production device may be further included.
- the database module Preferably, the database module,
- the service providing server provides server,
- It may further include a video providing module that provides the user device with a video explaining the wrong problem as a result of the scoring by the scoring module.
- the automatic scoring system using the QR code proposed in the present invention when the QR code provided in the questionnaire and the answer entry part in which the user's answer is written are photographed with the user device running the automatic scoring application, the information and the correct answer of the questionnaire are
- the stored service providing server recognizes the captured QR code and the user's answer, automatically scores, and provides the scoring result to the user device, so that the correct answer can be scored easily and quickly and conveniently without fear of leakage or loss of the correct answer sheet in advance. I can.
- the service providing server calculates the user's ranking from the scoring results for the same question paper and provides it to the user device in real time, so that even if the user does not take a mock test, etc. You can easily grasp the level of academic achievement at the national level.
- FIG. 1 is a view showing the configuration of an automatic scoring system using a QR code according to an embodiment of the present invention.
- FIG. 2 is a view showing an example of a user device photographing a questionnaire for automatic scoring in an automatic scoring system using a QR code according to an embodiment of the present invention.
- FIG 3 is a view showing, for example, a QR code and an answer writing unit in an automatic scoring system using a QR code according to an embodiment of the present invention.
- FIG. 4 is a diagram showing a detailed configuration of a service providing server in the automatic scoring system using a QR code according to an embodiment of the present invention.
- FIG. 5 is a diagram illustrating a user device provided with a scoring result, for example, in an automatic scoring system using a QR code according to an embodiment of the present invention.
- FIG. 1 is a diagram showing the configuration of an automatic scoring system using a QR code according to an embodiment of the present invention.
- the automatic scoring system using a QR code according to an embodiment of the present invention may be configured to include a service providing server 100 and a user device 200, and a problem sheet production device 300 ) May be further included.
- the service providing server 100 stores the information of the questionnaire and the correct answer, recognizes the QR code and the user's answer photographed by the user device 200, and automatically scores using the recognition result, and scores the result of the user device 200 ) Can be provided.
- the service providing server 100 allows access to the user device 200 and may transmit and receive various signals and data.
- the network is a wired network such as a local area network (LAN), a wide area network (WAN), or a value added network (VAN), a mobile radio communication network, or a satellite communication network. , Wireless Broadband Internet (WIBRO), High Speed Downlink Packet Access (HSDPA), and the like.
- WIBRO Wireless Broadband Internet
- HSDPA High Speed Downlink Packet Access
- the user device 200 drives the automatic scoring application 210, is provided on a questionnaire that requires scoring, and is located near the QR code and the QR code including information on the questionnaire, and a camera on the answer writing unit in which the user's answer is written. You can shoot with.
- the automatic scoring application 210 means a set of terminal programs designed to perform a specific task, and may also be expressed as'application program' or'application software'.
- FIG. 2 is a diagram illustrating an example of a user device 200 photographing a questionnaire 10 for automatic scoring in an automatic scoring system using a QR code 20 according to an embodiment of the present invention
- 3 is a diagram illustrating, for example, a QR code 20 and an answer writing unit 30 in an automatic scoring system using a QR code 20 according to an embodiment of the present invention.
- the QR code 20 and the answer writing unit 30 are used as the user device 200.
- the user device 200 may photograph the QR code 20 and the answer recording unit 30 at the same time, as shown in FIG. 2, but the QR code 20 and the answer recording unit 30 may be respectively photographed. have.
- a photographing guide may be displayed on the screen of the user device 200 for accurate recognition.
- the questionnaire 10 may be provided with a QR code 20 and an answer writing unit 30, where the questionnaire 10 may be in the form of a book such as a question book, but in the form of a print If it is a questionnaire (10) that requires scoring, such as an examination paper, it is not limited to a specific form.
- a QR code 20 and an answer writing unit 30 may be provided for each page or chapter, so that it is possible to conveniently score.
- the QR code 20 may include information on the question paper 10.
- information on the question paper 10 For example, in the case of a question book, by including the name of the question book, page or chapter information, etc. in the QR code 20, from the information of the question paper 10 obtained through recognition of the QR code 20, a math junior high school published by a publishing company You can grasp the information on specific question papers (10), such as the 2nd semester 1st semester problem book, the 3rd unit concept consolidation chapter, and pages 124-125.
- the answer writing unit 30 is located around the QR code 20 and the user's answer may be written, and may be configured in a table form according to the number of questions and the number of questions included in the questionnaire 10. .
- the answer writing unit 30 may be located on the right side of the QR code 20, and may be in the form of a table consisting of a column for writing an item number and a user's answer. have.
- the user device 200 or the service providing server 100 may extract the user's answer written by the user from the answer writing unit 30 using an optical character reader (OCR). Therefore, the answer writing unit 30 may include an answer writing reference line for increasing the character reading rate. For example, by including a reference line for answer writing in the shape of a number “8” in a rectangular shape, like the answer entry column of item numbers 1 to 5 of the answer writing unit 30 of FIG. 3, the user can match the answer writing baseline. You can have users write their answers.
- the answer may be freely written by the user by configuring it with blank spaces, such as the answer entry boxes of item numbers 6 to 10 of the answer writing unit 30 of FIG. 3.
- the answer writing unit 30 of FIGS. 2 and 3 an example in which one number is written for each question number is shown, but if necessary for writing an answer, such as a plurality of numbers and letters, the structure and shape of the answer writing unit 30 It can be implemented in various ways.
- the QR code 20 and the answer writing unit 30 may be printed or attached to the question paper 10. That is, as shown in FIG. 2, it may be in the form printed on the questionnaire 10, but by separately printing the QR code 20 as shown in FIG. 3 and the answer writing unit 30 disposed around it It can also be attached to the problem paper 10. For example, it may be produced as a sticker and attached to the blank space of the problem paper 10, and depending on the embodiment, it may be printed separately and distributed to the user. There may be a situation in which it is impossible to print on the problem book 10, or when applying the present invention to a problem book used in a small academy, etc., it may be a situation in which it is not possible to directly print the problem book, according to an embodiment of the present invention. In the automatic scoring system using the code 20, since the QR code 20 and the answer writing unit 30 can be produced and used separately from the questionnaire 10, its utilization can be maximized.
- the questionnaire production device 300 stores information of the questionnaire 10 and the correct answer of the problem included in the questionnaire 10 in the service providing server 100, and a QR code corresponding to the information of the stored questionnaire 10 You can request the creation of (20).
- the problem sheet manufacturing device 300 may be provided with the QR code 20 generated according to the request and printed on the problem sheet 10 or separately printed and attached to the problem sheet 10.
- the QR code 20 generated according to the request and printed on the problem sheet 10 or separately printed and attached to the problem sheet 10.
- the answer writing unit 30 disposed around the QR code 20 is also generated based on the number of questions and the number of questions included in the corresponding questionnaire 10, and shown in FIG. It may be provided to the problem sheet manufacturing device 300 in the form as shown.
- the user device 200 and the problem sheet production device 300 of the present invention may include various devices such as a personal computer (PC), a smartphone, a tablet PC, and a wearable device. have.
- the user device 200 is preferably a mobile device in order to improve the convenience of scoring
- the problem sheet production device 300 is preferably a device capable of wired or wireless printing or editing the question sheet 10.
- the user device 200 and the questionnaire production device 300 are not limited to the types of devices described above, and access the service providing server 100 through a network to obtain the QR code 20 according to an embodiment of the present invention. If the used automatic scoring system can be used, the user device 200 and the problem sheet making device 300 can play any number of roles regardless of their specific type.
- FIG. 4 is a diagram showing a detailed configuration of a service providing server 100 in an automatic scoring system using a QR code 20 according to an embodiment of the present invention.
- the service providing server 100 of the automatic scoring system using the QR code 20 may be configured to include a ranking calculation module 140 and a result providing module 150, may be configured to further include a QR code production module 160 and a video providing module 170.
- the database module 110 may store information on the questionnaire 10 and a correct answer to a question included in the questionnaire 10.
- the information on the questionnaire 10 may include the name of the question book, page or chapter information, the number of questions, and the number of questions.
- the information on the questionnaire (10) is a collection of problems for the 1st semester of b math junior high school, 2nd semester of b math junior high school published by b publishing company, chapter 3, chapter 3, pages 124-125, 3 questions, question number 1, 2 and 3, etc. May contain information.
- the correct answer to the question may be stored for each question number as the correct answer 3 of the question number 1, the correct answer 3 of the question number 2, the correct answer 5 of the question number 3, etc. for each question number.
- the database module 110 may store information on each questionnaire 10 or a scoring result for each question, and may store a video explaining a problem included in the questionnaire 10.
- the explanatory video may enhance understanding by viewing a description of an incorrect problem as a video, including a problem solving process and a conceptual explanation.
- the information recognition module 120 may recognize information of the questionnaire 10 and the user's answer from the QR code 20 and the answer writing unit 30 photographed by the user device 200, respectively. That is, the user executes the automatic scoring application 210 on the user device 200, and uses a camera as shown in FIG. 2, the QR code 20 and the answer writing unit 30 provided in the questionnaire 10 ) Can be photographed. The information recognition module 120 may receive the captured image from the user device 200 and extract the information of the questionnaire 10 from the QR code 20 and the user's answer from the answer writing unit 3, respectively. .
- the QR code 20 and the answer writing unit 30 photographed by the user device 200 may be transmitted to the information recognition module 120 in the form of an image, but the automatic scoring application 210 installed on the user device 200 ) Including this automatic recognition function, information of the questionnaire 10 and a user answer may be recognized and the recognized information may be transmitted to the service providing server 100.
- the information recognition module 120 may extract the user's answer written by the user from the answer writing unit 30 using an optical character reader (OCR). That is, the information recognition module 120 may convert a user's answer written by the user by hand into digital information through optical character reading, as shown in FIG. 3.
- OCR optical character reader
- the extracted user's answer is displayed on the screen of the user device 200 so that the user can check whether the answer is correctly recognized, and if necessary, the user may directly modify the answer.
- the scoring module 130 automatically uses the information of the questionnaire 10 recognized by the information recognition module 120 and the user's answer, and the information and correct answers of the questionnaire 10 stored in the database module 110.
- the scoring may be performed and the scoring result may be stored in the database module 110. That is, if the information of the questionnaire 10 stored in the database module 110 is searched for using the information of the recognized questionnaire 10, and the correct answer stored in correspondence with the information of the searched questionnaire 10 and the user's answer match If there is a positive or disagreement, it is possible to score incorrectly.
- the scoring results may be stored in the database module 110, and by storing the scoring results for each user or for each information on the questionnaire 10, the user's academic achievement is measured, or the correct answer ratio of users for each questionnaire 10, etc. You can make the analysis possible.
- the scoring result stored in the database module 110 as described above may be used to determine the difficulty level for each problem, determine the problem error, and develop a new problem.
- the ranking calculation module 140 may calculate a user's ranking from scoring results for the same question sheet 10 corresponding to the information on the question sheet 10 stored in the database module 110. For example, for the first semester of b math junior high school 1st semester problem book published by b publishing company, chapter 3 concept consolidation chapter, pages 124-125, 3 questions, question number 1, 2, and 3, 3 questions were scored. By analyzing the user's scoring results, the ranking of the user corresponding to the information on the question sheet 10 may be calculated. Therefore, among all the users who solved the question paper 10 regardless of the region and scored with the automatic scoring application 210, in the unit of the questionable paper 10 that can be scored, not the entire test paper or the question book, the national ranking of the user Can be calculated. Depending on the embodiment, the national ranking may be initialized according to a predetermined period such as a grade change or a test period, so that an accurate ranking may be derived.
- the order calculation module 140 may calculate a percentage of correct and incorrect answers of users for each question included in the question sheet 10. That is, by calculating the percentage of correct and incorrect answers for each question, it is possible to determine the difficulty level for each question and to facilitate comparison with other users.
- the result providing module 150 may provide the scoring result of the scoring module 130 and the user's ranking calculated by the ranking calculation module 140 to the user device 200 in real time. That is, not only the scoring result corresponding to the information on the questionnaire 10, but also the user's ranking is provided to the user device 200 in real time, thereby inspiring the user's academic motivation.
- FIG. 5 is a diagram illustrating, for example, a user device 200 provided with a scoring result in an automatic scoring system using a QR code 20 according to an embodiment of the present invention.
- the result of the service providing server 100 through the automatic scoring application 210 of the user device 200 The scoring result provided by the providing module 150 and the user's ranking may be checked.
- the scoring result and ranking can be checked in real time immediately after the QR code 20 and the answer writing unit 30 are photographed, the user's convenience is improved and the level of academic achievement at the national level can be identified. I can.
- the QR code production module 160 generates a QR code 20 corresponding to the information of the problem sheet 10 stored in the database module 110 according to the request of the problem sheet production device 300, and the problem sheet production device 300
- the QR code 20 generated in) can be provided. That is, the questionnaire production device 300 may access the service providing server 100 to upload information on the questionnaire 10 and a correct answer to the problem, and request generation of the QR code 20.
- the QR code production module 160 may generate and provide the QR code 20 according to the request of the problem sheet production device 300.
- the QR code production module 160 as well as the QR code 20, the answer writing unit 30 disposed around the QR code 20, the number of questions and the number of questions included in the question sheet 10 They may be generated together and provided to the problem sheet production device 300 in the form as shown in FIG. 3. Therefore, the questionnaire manufacturing device 300 may be used in a manner such as printing the provided QR code 20 and the answer writing unit 30 on the questionnaire 10 or separately printing and attaching it to the questionnaire 10.
- the video providing module 170 may provide a result of scoring by the scoring module 130 and a video explaining the wrong problem to the user device 200. That is, in the screen as shown in FIG. 5, when the “explanation video” button is selected on the screen of the user device 200 for question number 2, which is an incorrect problem, the user device 200 responds to the problem to the service providing server 100 You can request a video explaining about it.
- the video providing module 170 may search for an explanation video stored in the database module 110 according to a request and provide it to the user device 200. In this way, since the user can view the solution of the wrong problem as a video directly from the automatic scoring application 210, the user's convenience can be improved and the user's learning can be aided.
- the QR code 20 provided in the question sheet 10 and the answer writing unit 30 on which the user's answer is written
- the service providing server 100 storing the information and the correct answer of the question sheet 10 recognizes the captured QR code 20 and the user's answer.
- the question sheet 10 can be scored easily and quickly and conveniently without fear of leaking the correct answer in advance or loss of the correct answer sheet.
- the service providing server 100 calculates the user's ranking from the scoring results for the same question sheet 10 and provides it to the user device 200 in real time, so that even if the user does not take a mock test, etc. You can grasp the level of academic achievement at the national level.
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Abstract
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Claims (8)
- 자동 채점 애플리케이션(210)을 구동하고, 채점이 필요한 문제지(10)에 구비되며 해당 문제지(10)의 정보가 포함된 QR코드(20) 및 상기 QR코드(20) 주변에 위치하며 사용자의 답안이 기재되는 답안 기재부(30)를 카메라로 촬영하는 사용자 디바이스(200); 및문제지(10)의 정보 및 정답을 저장하고, 상기 사용자 디바이스(200)에서 촬영된 QR코드(20) 및 사용자의 답안을 인식하며, 인식 결과를 이용해 자동으로 채점하여 채점 결과를 상기 사용자 디바이스(200)에 제공하는 서비스 제공 서버(100)를 포함하며,상기 서비스 제공 서버(100)는,문제지(10)의 정보 및 해당 문제지(10)에 포함된 문제의 정답을 저장하는 데이터베이스 모듈(110);상기 사용자 디바이스(200)에서 촬영된 QR코드(20) 및 답안 기재부(30)로부터 문제지(10)의 정보 및 사용자의 답안을 각각 인식하는 정보 인식 모듈(120);상기 정보 인식 모듈(120)에서 인식된 문제지(10)의 정보 및 사용자의 답안과, 상기 데이터베이스 모듈(110)에 저장된 문제지(10)의 정보 및 정답을 이용해 사용자의 답안을 자동으로 채점하고, 채점 결과를 상기 데이터베이스 모듈(110)에 저장하는 채점 모듈(130);상기 데이터베이스 모듈(110)에 저장된 상기 문제지(10)의 정보에 대응하는 동일한 문제지(10)에 대한 채점 결과들로부터 사용자의 석차를 산출하는 석차 산출 모듈(140); 및상기 채점 모듈(130)의 채점 결과 및 상기 석차 산출 모듈(140)에서 산출된 사용자의 석차를 실시간으로 상기 사용자 디바이스(200)에 제공하는 결과 제공 모듈(150)을 포함하는 것을 특징으로 하는, QR코드(20)를 이용한 자동 채점 시스템.
- 제1항에 있어서, 상기 QR코드(20) 및 답안 기재부(30)는,상기 문제지(10)에 인쇄 또는 부착된 것을 특징으로 하는, QR코드(20)를 이용한 자동 채점 시스템.
- 제1항에 있어서, 상기 답안 기재부(30)는,상기 문제지(10)에 포함된 문제의 개수 및 문항 번호에 따라 테이블 형태로 구성되는 것을 특징으로 하는, QR코드(20)를 이용한 자동 채점 시스템.
- 제1항에 있어서, 상기 정보 인식 모듈(120)은,광학 문자 판독(Optical Character Reader; OCR)을 이용해 상기 답안 기재부(30)로부터 사용자가 기재한 사용자의 답안을 추출하는 것을 특징으로 하는, QR코드(20)를 이용한 자동 채점 시스템.
- 제4항에 있어서, 상기 답안 기재부(30)는,문자 판독률을 높이기 위한 답안 작성 기준선을 포함하는 것을 특징으로 하는, QR코드(20)를 이용한 자동 채점 시스템.
- 제1항에 있어서, 상기 석차 산출 모듈(140)은,해당 문제지(10)에 포함된 문제별로 사용자들의 정오답 비율을 산출하는 것을 특징으로 하는, QR코드(20)를 이용한 자동 채점 시스템.
- 제1항에 있어서, 상기 서비스 제공 서버(100)는,문제지 제작 디바이스(300)의 요청에 따라, 상기 데이터베이스 모듈(110)에 저장된 문제지(10)의 정보에 대응하는 QR코드(20)를 생성하고, 상기 문제지 제작 디바이스(300)에 생성된 QR코드(20)를 제공하는 QR코드 제작 모듈(160)을 더 포함하는 것을 특징으로 하는, QR코드(20)를 이용한 자동 채점 시스템.
- 제1항에 있어서, 상기 데이터베이스 모듈(110)은,상기 해당 문제지(10)에 포함된 문제에 대한 해설 동영상을 저장하며,상기 서비스 제공 서버(100)는,상기 채점 모듈(130)의 채점 결과, 틀린 문제에 대한 해설 동영상을 상기 사용자 디바이스(200)에 제공하는 동영상 제공 모듈(170)을 더 포함하는 것을 특징으로 하는, QR코드(20)를 이용한 자동 채점 시스템.
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KR20170021101A (ko) * | 2015-08-17 | 2017-02-27 | (주)플레이스터디 | 채점 정보 및 학습 정보를 사용자에게 제공하기 위한 스마트 학습용 장치, 방법 및 컴퓨터 판독가능 저장 매체 |
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