A practical teaching method for chemical experiments based on virtual reality scenes

Abstract

The present invention discloses a practical teaching method for chemical experiments based on virtual reality scenes, relates to the field of intelligent learning technology, and is used to solve the problem that the existing virtual reality practical teaching method for chemical experiments cannot timely remind students of the degree of standardization of experimental operations. The method comprises: real-time acquisition of coordinate information of the body of the current student in a preset two-dimensional coordinate system during the current chemical experiment operation; according to the body coordinate information, calculating the number of times the current student maintains a safe experimental operation distance; according to the body coordinate information of the current student during the current chemical experiment operation, calculating the number of times the current student correctly maintains the teacher's guidance angle; according to the number of times the current student maintains a safe experimental operation distance and correctly maintains the teacher's guidance angle, calculating the amount of experimental reagents supplied to the current student in the next experiment and showing it to the current student. The present invention can timely remind students of the degree of standardization of chemical experiment operations.

Description

Technical Field

[0001] The present invention relates to the field of intelligent learning technology, and in particular to a chemical experiment practical teaching method based on a virtual reality scene. Background Art

[0002] Chemistry is a natural science based on experiments. Through chemical experiments, students' interest in learning can be stimulated, their ability to observe, analyze and solve problems can be cultivated, and their understanding of basic chemical concepts and chemical reaction principles can be helped. However, the chemical reagents used in chemical experiments are often dangerous. Some are corrosive and toxic, and absorption through the skin or mouth and nose can lead to life safety. At the same time, improper operation during the student experiment will also lead to dangerous things.

[0003] In order to avoid the occurrence of dangerous events in chemical experiments, with the rapid development of virtual technology, virtual reality chemical experiment practical teaching methods have emerged. Because this method can effectively reduce the occurrence of safety accidents, it has been recognized by teachers and students. However, the current virtual reality chemical experiment practical teaching methods have a low degree of intelligence, cannot effectively analyze and count students' practical operations during the experiment, and cannot remind students to standardize experimental operations in a timely manner. Summary of the invention

[0004] The present invention provides a chemical experiment practical teaching method based on a virtual reality scene, which is used to solve the problem that the existing virtual reality chemical experiment practical teaching method is not intelligent enough and cannot timely remind students to standardize experimental operations. The present invention provides a chemical experiment practical teaching method based on a virtual reality scene. According to the real-time collected body position information of students in the chemical experiment, the amount of experimental reagents to be supplied to students in the next experiment is obtained and displayed through intelligent analysis. Students can indirectly know the degree of standardization of the experimental operation through the amount of experimental reagents.

[0005] The chemical experiment practical teaching method based on virtual reality scene provided by the present invention comprises:

[0006] Real-time acquisition of the coordinate information of the student's body in a preset two-dimensional coordinate system during the current chemical experiment operation;

[0007] Calculating the number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation according to the body coordinate information of the current student during the current chemical experiment operation;

[0008] Calculating the number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation according to the body coordinate information of the current student during the current chemical experiment operation;

[0009] According to the number of times the current student maintains a safe experimental operation distance and correctly maintains the teacher's guidance angle during the current chemical experiment operation, the amount of experimental reagents to be supplied to the current student in the next experiment is calculated and displayed to the current student.

[0010] In an optional embodiment, before the real-time acquisition of coordinate information of the student's body in a preset two-dimensional coordinate system during the current chemical experiment operation, the method further includes:

[0011] A two-dimensional coordinate system is constructed with the center of the current student chemical experiment operation bench as the coordinate origin, the right direction parallel to the long side of the bench as the positive direction of the X axis, and the upward direction perpendicular to the long side of the bench as the positive direction of the Y axis;

[0012] The two-dimensional coordinate system is used as a preset two-dimensional coordinate system.

[0013] In an optional embodiment, the body coordinate information of the current student during the current chemical experiment operation process includes: the coordinates of the nose tip and waist center of the current student during the current experiment operation process;

[0014] The step of calculating the number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation according to the body coordinate information of the current student during the current chemical experiment operation includes:

[0015] The number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation is calculated according to the following formula:

[0016]

[0017] Where W represents the number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation. represents the nose tip coordinate of the current student at the tth moment during the current chemical experiment operation; represents the waist center coordinate of the current student at the tth moment during the current chemical experiment operation; u() is represented as a step function, α min represents the minimum safe operating distance between the nose tip and the experimental table during the current chemical experiment of the current student, α max represents the maximum safe operating distance between the nose tip and the experimental table during the current chemical experiment of the current student, β min represents the minimum safe operating distance between the waist and the experimental table during the current chemical experiment operation of the current student, β max It represents the maximum safe operating distance between the waist of the current student and the tabletop during the current chemical experiment operation, and T represents the specified duration of the current experimental operation process.

[0018] In an optional embodiment, the calculating, based on the body coordinate information of the current student during the current chemical experiment operation, the number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation includes:

[0019] The number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation is calculated according to the following formula:

[0020]

[0021] Where F represents the number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation, δ() represents the unit impulse function, and C t It is represented by the human body posture angle value corresponding to the virtual teacher's guidance information at the tth moment during the current chemical experiment operation of the current student.

[0022] In an optional embodiment, the amount of experimental reagents to be supplied to the current student in the next experiment is calculated according to the number of times the current student maintains a safe experimental operation distance and correctly maintains the teacher's guidance angle during the current chemical experiment operation, including:

[0023] The supply amount of the current student experimental reagent for the next experiment is calculated according to the following formula:

[0024]

[0025] Wherein, G represents the supply amount of the experimental reagent for the current student in the next experiment; G max It represents the maximum supply of experimental reagents within a safe range for the current student's experimental operation in the next experiment.

[0026] In an optional embodiment, before the real-time acquisition of coordinate information of the student's body in a preset two-dimensional coordinate system during the current chemical experiment operation, the method further includes:

[0027] Virtual reality technology is used to construct a virtual chemical experiment scene as the environment for students' current chemical experiment operations.

[0028] The virtual reality scene-based chemical experiment practical teaching method provided by the present invention calculates the number of times the student maintains a safe experimental operation distance and the number of times the teacher's guidance angle is correctly maintained according to the student's body position information collected in real time during the chemical experiment operation, and then calculates the amount of experimental reagents to be supplied to the student in the next experiment according to the above two times information and displays it to the student. The student can indirectly know the degree of operation standardization during the experimental operation through the amount of experimental reagents. If the amount is smaller, the experimental operation is less standardized. At the same time, when the student's experimental operation is less standardized, the student is given less experimental reagents, which can not only ensure the safety of the student's experiment, but also avoid wasting experimental reagents.

[0029] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0030] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 This is a flow chart of Example 1 of a chemical experiment practical teaching method based on a virtual reality scene in an embodiment of the present invention.

[0033] Figure 2 The flowchart of the method for establishing a two-dimensional coordinate system is shown in FIG. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0035] Figure 1 FIG. 1 is a flow chart of a first embodiment of a chemical experiment practical teaching method based on a virtual reality scene in an embodiment of the present invention. Figure 1 As shown, the method includes the following steps S101-S104:

[0036] S101: real-time acquisition of coordinate information of the student's body in a preset two-dimensional coordinate system during the current chemical experiment operation;

[0037] In this embodiment, virtual reality technology is used to construct a virtualized chemical experiment scene as the environment for the current chemical experiment operation of the current student, which not only ensures the authenticity of the experimental environment, but also prevents students from having safety hazards during the experiment. In this virtual scene, students will be in a room, with an empty table in front of each student, and then the students will wear virtual reality glasses, commonly known as VR, and then the glasses will display the corresponding dose of chemical reagents on the table by identifying some signs on the table and the settings of the teacher, and then let the students do the experiment, so the students are always doing the experiment in the room, and the student body coordinate information (such as the coordinates of the nose tip and the midpoint of the waist) is collected by the camera placed in the room.

[0038] Preferably, if Figure 2 As shown, before step S101, the following steps are also included:

[0039] S201: construct a two-dimensional coordinate system with the center of the current student chemistry experiment operation bench as the coordinate origin, the right direction parallel to the long side of the bench as the positive direction of the X axis, and the upward direction perpendicular to the long side of the bench as the positive direction of the Y axis;

[0040] S202: Using the two-dimensional coordinate system as a preset two-dimensional coordinate system.

[0041] S102: Calculating the number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation according to the body coordinate information of the current student during the current chemical experiment operation;

[0042] Preferably, the body coordinate information includes the coordinates of the nose tip and the waist center, and the number of times the current student maintains the safe experimental operation distance during the current chemical experiment operation can be calculated according to the following formula (1):

[0043]

[0044] Among them, W represents the number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation. The more times, the more standardized the current student's experimental operation is; represents the nose tip coordinate of the current student at the tth moment during the current chemical experiment operation; represents the waist center coordinate of the current student at the tth moment in the current chemical experiment operation process; u() represents a step function, and the value in the bracket is 1 when it is greater than or equal to 0, and the value in the bracket is 0 when it is less than 0; α min represents the minimum safe operating distance between the nose tip and the experimental table during the current chemical experiment of the current student, α maxrepresents the maximum safe operating distance between the nose tip and the experimental table during the current chemical experiment of the current student, β min represents the minimum safe operating distance between the waist and the experimental table during the current chemical experiment operation of the current student, β max It represents the maximum safe operating distance between the waist of the current student and the tabletop during the current chemical experiment operation, and T represents the specified duration of the current experimental operation process.

[0045] S103: Calculating the number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation according to the body coordinate information of the current student during the current chemical experiment operation;

[0046] Preferably, the number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation is calculated according to the following formula (2):

[0047]

[0048] Wherein, F represents the number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation, δ() represents the unit impulse function, when the value in the bracket is equal to 0, the function value is 1, when the value in the bracket is not equal to 0, the function value is 0, C t It is represented by the human body posture angle value corresponding to the virtual teacher's guidance information at the tth moment during the current chemical experiment operation of the current student.

[0049] S104: According to the number of times the current student maintains a safe experimental operation distance and correctly maintains the teacher's guidance angle during the current chemical experiment operation, the amount of experimental reagents to be supplied to the current student in the next experiment is calculated and displayed to the current student.

[0050] Preferably, the supply amount of the current student experiment reagent for the next experiment is calculated according to the following formula (3):

[0051]

[0052] Wherein, G represents the supply amount of the experimental reagent for the current student in the next experiment; G max It represents the maximum supply of experimental reagents within a safe range for the current student's experimental operation in the next experiment.

[0053] The chemical experiment practical teaching method based on virtual reality scene provided by the embodiment of the present invention calculates the number of times the student maintains a safe experimental operation distance and the number of times the teacher's guidance angle is correctly maintained according to the student's body position information collected in real time during the chemical experiment operation, and then calculates the amount of experimental reagents to be supplied to the student in the next experiment according to the aforementioned two times information and displays it. The student can know the degree of operation standardization during the experimental operation through the amount of experimental reagents. The smaller the amount, the less standardized the experimental operation. At the same time, when the student's experimental operation is less standardized, giving the student less experimental reagents can not only ensure the student's safety but also avoid waste of experimental reagents.

[0054] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0055] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0056] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0057] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0058] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A practical teaching method for chemical experiments based on virtual reality scenes, characterized in that: The following steps are involved: Real-time acquisition of the coordinate information of the student's body in the preset two-dimensional coordinate system during the current chemical experiment operation; Calculating the number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation according to the body coordinate information of the current student during the current chemical experiment operation; Calculating the number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation according to the body coordinate information of the current student during the current chemical experiment operation; According to the number of times the current student maintains a safe experimental operation distance and correctly maintains the teacher's guidance angle during the current chemical experiment operation, the amount of experimental reagents to be supplied to the current student in the next experiment is calculated and displayed to the current student; Wherein, before the real-time acquisition of coordinate information of the student's body in a preset two-dimensional coordinate system during the current chemical experiment operation, the method further includes: A two-dimensional coordinate system is constructed with the center of the current student chemical experiment operation bench as the coordinate origin, the right direction parallel to the long side of the bench as the positive direction of the X axis, and the upward direction perpendicular to the long side of the bench as the positive direction of the Y axis; Using the two-dimensional coordinate system as a preset two-dimensional coordinate system; The body coordinate information of the current student during the current chemical experiment operation includes: the coordinates of the nose tip and waist center of the current student during the current experiment operation; The step of calculating the number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation according to the body coordinate information of the current student during the current chemical experiment operation includes: The number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation is calculated according to the following formula: Where W represents the number of times the current student maintains a safe experimental operation distance during the current chemical experiment operation. represents the nose tip coordinate of the current student at the tth moment during the current chemical experiment operation; represents the waist center coordinate of the current student at the tth moment during the current chemical experiment operation; u() is represented as a step function, α min represents the minimum safe operating distance between the nose tip and the experimental table during the current chemical experiment of the current student, α max represents the maximum safe operating distance between the nose tip and the experimental table during the current chemical experiment of the current student, β min represents the minimum safe operating distance between the waist and the experimental table during the current chemical experiment operation of the current student, β max represents the maximum safe operating distance between the waist of the current student and the experimental table during the current chemical experiment operation, and T represents the specified duration of the current experimental operation process; The step of calculating the number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation according to the body coordinate information of the current student during the current chemical experiment operation includes: The number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation is calculated according to the following formula: Where F represents the number of times the current student correctly maintains the teacher's guidance angle during the current chemical experiment operation, δ() represents the unit impulse function, and C t It is represented by the human body posture angle value corresponding to the virtual teacher's guidance information at the tth moment during the current chemical experiment operation of the current student.

2. The chemical experiment practical teaching method based on virtual reality scene as claimed in claim 1 is characterized in that: The method of calculating the amount of experimental reagents to be supplied to the current student in the next experiment according to the number of times the current student maintains a safe experimental operation distance and correctly maintains a teacher's guidance angle during the current chemical experiment operation process comprises: The supply amount of the current student experimental reagent for the next experiment is calculated according to the following formula: Where G represents the supply of the current student's experimental reagents for the next experiment, G max It represents the maximum supply of experimental reagents within a safe range for the current student's experimental operation in the next experiment.

3. The chemical experiment practical teaching method based on virtual reality scene as claimed in claim 2 is characterized in that: Before the real-time acquisition of coordinate information of the student's body in a preset two-dimensional coordinate system during the current chemical experiment operation, the method further includes: Virtual reality technology is used to construct a virtual chemical experiment scene as the environment for students' current chemical experiment operations.

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