Multifunctional experimental device and teaching evaluation method and system

Abstract

A multifunctional experiment device comprises an experiment table, the experiment table comprises a table top, a plurality of stand columns and a back baffle, a sliding groove parallel to the table top is formed in the back baffle, a moving rod parallel to the table top is arranged in the sliding groove in a sliding mode, and the moving rod can move in the width direction and the length direction of the table top. A sliding seat is arranged on the moving rod in a sliding mode, the sliding seat is rotationally connected with a plurality of cameras, and all the cameras are jointly connected with a monitoring host in a wireless communication mode; a plurality of supporting assemblies are movably arranged on the table top, and each supporting assembly comprises a base plate arranged on the table top, a plurality of telescopic rods vertically arranged on the base plate and a supporting plate jointly and fixedly connected with the upper ends of all the telescopic rods. In the experiment teaching process, the experiment videos of the students can be shot, then the experiment operations of the students are evaluated according to the experiment videos, and finally the experiment teaching process is comprehensively evaluated according to the experiment operation evaluation results of all the students.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental teaching equipment, and specifically relates to a multifunctional experimental device, a teaching evaluation method and a system. Background Art

[0002] Experimental teaching is an important teaching method. Especially in basic education, experimental teaching can effectively cultivate students' interests, thereby enhancing students' enthusiasm and ability for active learning. During the experimental teaching process, it is necessary to evaluate students and teachers. In the past, experimental teaching was that teachers evaluated students' experimental abilities through students' experimental previews, experimental reports, and impressions of students. There was a lack of quantitative analysis of the experimental process, the evaluation of students' experimental abilities had no data support, and the burden on teachers was relatively large. On the other hand, the evaluation process was almost entirely carried out by teachers independently. Therefore, it was also difficult to evaluate teachers' teaching processes, and it was not conducive to teachers improving their teaching activities. Summary of the Invention

[0003] To solve the deficiencies in the prior art, the present invention provides a multifunctional experimental device, a teaching evaluation method and a system. The invention has high flexibility and can be applied to various different experimental teachings. By changing the height of the support component, it is convenient for students to operate. During the experimental teaching process, it is also possible to shoot students' experimental videos, and then evaluate students' experimental operations based on the experimental videos. Finally, a comprehensive evaluation of the experimental teaching process is carried out according to the experimental operation evaluation results of all students, which is beneficial for teachers to improve experimental teaching.

[0004] To achieve the above object, the specific solution adopted by the present invention is as follows:

[0005] A multifunctional experimental device includes an experimental table. The experimental table includes a tabletop, a plurality of columns for supporting the tabletop, and a back baffle vertically and fixedly arranged on the tabletop. A chute parallel to the tabletop is provided on the back baffle. A moving rod parallel to the tabletop is slidably arranged in the chute, and the moving rod can move along the width direction and the length direction of the tabletop. A sliding seat is slidably arranged on the moving rod. The sliding seat is rotatably connected with a plurality of cameras. All the cameras are wirelessly communicatively connected to a monitoring host; A plurality of support components are movably arranged on the tabletop. The support component includes a substrate arranged on the tabletop, a plurality of telescopic rods vertically arranged on the substrate, and a support plate fixedly connected to the upper ends of all the telescopic rods.

[0006] Preferably, an upper limit plate and a lower limit plate are fixedly connected to one side of the back baffle facing away from the tabletop. The upper limit plate and the lower limit plate are parallel to each other, and there is a distance between the upper limit plate and the lower limit plate. The moving rod passes through between the upper limit plate and the lower limit plate and contacts both the upper limit plate and the lower limit plate.

[0007] Preferably, a first slideway extending along the length direction is formed in the middle of the moving rod. The first slideway communicates with a second slideway, and the second slideway penetrates through the upper surface of the moving rod. The sliding seat is fixedly connected with a second sliding part. The second sliding part includes a first part slidably arranged in the first slideway and a second part slidably arranged in the second slideway.

[0008] Preferably, the sliding seat is fixedly connected with two parallel first sliding parts, and the two first sliding parts are respectively attached to two opposite side walls of the moving rod.

[0009] Preferably, a connecting shaft is rotatably penetrated through the sliding seat. The connecting shaft is fixedly connected with two rotating blocks, and a plurality of the cameras are arranged on each rotating block.

[0010] Preferably, two parallel side baffles are vertically and fixedly arranged on the tabletop. The top of the side baffle is fixedly connected with a suspension rod through at least two top rods, and the suspension rod is fixedly connected with a plurality of hooks extending along the length direction.

[0011] Preferably, the telescopic rod includes a sleeve vertically and fixedly arranged on the base plate. A lifting rod is slidably arranged in the sleeve. The upper end of the lifting rod is fixedly connected with the support plate. A positioning bolt is penetrated through the sleeve, and the positioning bolt can press the lifting rod against the inner wall of the sleeve to fix the lifting rod.

[0012] A teaching evaluation method, a multifunctional experimental device based on the above, the method includes the following steps: Adjust the position of the support assembly on the tabletop, and let students conduct experiments on the support assembly; Adjust the position of the moving rod and the angle of the camera so that the camera can capture the support assembly; Use the camera to capture the experimental process of the students, and upload the captured experimental video to the monitoring host; Use the monitoring host to process the experimental video, and generate a teaching evaluation result based on the processing result.

[0013] Preferably, the method of using the monitoring host to process the experimental video and generate a teaching evaluation result based on the processing result includes: Use the monitoring host to perform frame parsing on the experimental video to obtain multiple video frames; Use the monitoring host to extract multiple key frames from the multiple video frames; Use the monitoring host to identify the key frames to obtain multiple pieces of experimental data; Use the monitoring host to compare the experimental data with pre-set standard data to obtain a degree of difference; Generate the teaching evaluation result based on all the degrees of difference.

[0014] A teaching evaluation system for implementing the above teaching evaluation method, the system comprising: A frame processing module for performing frame parsing on the experimental video to obtain the multiple video frames and extracting the key frames from the video frames; An image recognition module for identifying the key frames to obtain the experimental data; A data processing module for comparing the experimental data with pre-set standard data to obtain a degree of difference; An evaluation module for generating the teaching evaluation result based on all the degrees of difference.

[0015] The present invention has high flexibility and can be applied to various different experimental teachings. Moreover, it is convenient for students to operate by changing the height of the support component; during the experimental teaching process, the present invention can implement shooting the experimental videos of students, and then evaluate the experimental operations of students according to the experimental videos. Finally, based on the experimental operation evaluation results of all students, a comprehensive evaluation of the experimental teaching process is carried out, which is beneficial for teachers to improve the experimental teaching. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the overall structure of the experimental device of the present invention;

[0018] Figure 2 It is a schematic diagram of the setting method of the hook;

[0019] Figure 3 It is a schematic diagram of the setting method of the sliding seat;

[0020] Figure 4Schematic diagram of the setting modes of the first limiting plate and the second limiting plate;

[0021] Figure 5 Schematic diagram of the structure of the rotating block;

[0022] Figure 6 Schematic diagram of the structure of the support assembly.

[0023] Reference numerals: 1 - column, 2 - tabletop, 3 - side baffle, 4 - ejector rod, 5 - suspension rod, 6 - back baffle, 7 - chute, 8 - moving rod, 9 - first slideway, 10 - second slideway, 11 - sliding seat, 12 - first sliding part, 13 - second sliding part, 14 - connecting shaft, 15 - rotating block, 16 - camera, 17 - hook, 18 - support plate, 19 - telescopic rod, 20 - substrate, 21 - upper limiting plate, 22 - lower limiting plate, 23 - sleeve, 24 - lifting rod, 25 - positioning bolt. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figure 1 shown, a multifunctional experimental device includes an experimental table, the experimental table includes a tabletop 2, a plurality of columns 1 for supporting the tabletop 2, and a back baffle 6 vertically and fixedly arranged on the tabletop 2. A chute 7 parallel to the tabletop 2 is formed on the back baffle 6. A moving rod 8 parallel to the tabletop 2 is slidably arranged in the chute 7, and the moving rod 8 can move along the width direction and the length direction of the tabletop 2. A sliding seat 11 is slidably arranged on the moving rod 8, and a plurality of cameras 16 are rotatably connected to the sliding seat 11. All the cameras 16 are commonly wirelessly communicatively connected to a monitoring host.

[0026] A plurality of support assemblies are movably arranged on the tabletop 2. The support assembly includes a substrate 20 arranged on the tabletop 2, a plurality of telescopic rods 19 vertically arranged on the substrate 20, and a support plate 18 fixedly connected to the upper ends of all the telescopic rods 19.

[0027] When conducting experimental teaching, first move the support component to a suitable position, and then change the height of the support plate 18 by adjusting the length of the telescopic rod 19 to facilitate students' operations. On the other hand, adjust the position of the moving rod 8 along the length and width directions of the tabletop 2, thereby changing the position of the sliding seat 11, and further changing the position of the camera 16. Then rotate the camera 16 so that the camera 16 can face the support component, that is, the camera 16 can face the operation area of the students, and then the experimental teaching can be started. During the experimental teaching process, students conduct experiments on the support plate 18, and the camera 16 can record the students' experimental process in real time and send the recorded experimental video to the monitoring host. After receiving the experimental video, the monitoring host analyzes the experimental video, and then evaluates the students' experimental operations, and summarizes all the evaluation results to evaluate the experimental teaching. Different types of experimental teaching use different experimental tools, and the present invention does not limit the specific experimental content. The support plate 18 of the support component can support various experimental tools.

[0028] The present invention has high flexibility and can be applied to various different experimental teachings. By changing the height of the support component, it is convenient for students to operate. During the experimental teaching process of the present invention, it can record the experimental video of the students in real time, and then evaluate the students' experimental operations according to the experimental video. Finally, according to the experimental operation evaluation results of all students, the experimental teaching process is comprehensively evaluated, which is beneficial for teachers to improve the experimental teaching.

[0029] As Figure 4 shown, in order to improve the stability of the moving rod 8, an upper limit plate 21 and a lower limit plate 22 are fixedly connected to the side of the back baffle 6 facing away from the tabletop 2. The upper limit plate 21 and the lower limit plate 22 are parallel to each other, and there is a distance between the upper limit plate 21 and the lower limit plate 22. The moving rod 8 passes through between the upper limit plate 21 and the lower limit plate 22 and is in contact with both the upper limit plate 21 and the lower limit plate 22. The upper limit plate 21 and the lower limit plate 22 cooperate with each other to support and reinforce the moving rod 8, avoiding the decrease in stability caused by different lengths of the two sides of the moving rod 8 located on both sides of the back baffle 6 during the movement process, and further ensuring that the camera 16 can stably record the students' experimental operations.

[0030] As Figure 3As shown in the figure, the specific setting method of the sliding seat 11 on the moving rod 8 is as follows: a first slideway 9 extending along the length direction is opened in the middle of the moving rod 8, the first slideway 9 communicates with a second slideway 10, and the second slideway 10 penetrates through the upper surface of the moving rod 8. The sliding seat 11 is fixedly connected with a second sliding part 13. The second sliding part 13 includes a first part slidably arranged in the first slideway 9 and a second part slidably arranged in the second slideway 10. Further, the width of the first slideway 9 is greater than the width of the second slideway 10. Correspondingly, the width of the first part is greater than the width of the second part. During the sliding process of the second sliding part 13, the first part cannot pass through the second slideway 10, and the second sliding part 13 cannot fall off the moving rod 8, so as to maintain the stability of the sliding seat 11, ensure that the sliding seat 11 can smoothly move along the length direction of the moving rod 8, and further change the position of the camera 16.

[0031] Based on the above structure, on the one hand, the sliding seat 11 can slide along the length direction of the moving rod 8 to change the position of the camera 16. On the other hand, the moving rod 8 can also move integrally and drive the sliding seat 11 to move, so as to change the position of the camera 16. Both methods can change the position of the camera 16, and the space above the tabletop 2 can be vacated during the movement of the moving rod 8 to avoid interfering with the students.

[0032] In order to further improve the stability of the sliding seat 11, the sliding seat 11 is fixedly connected with two parallel first sliding parts 12, and the two first sliding parts 12 are respectively attached to the two opposite side walls of the moving rod 8. The two first sliding parts 12 cooperate with each other to jointly limit the sliding seat 11, avoiding the sliding seat 11 from falling off the moving rod 8 and also avoiding the sliding seat 11 from reversing.

[0033] As Figure 5 shown, the specific connection method between the sliding seat 11 and the camera 16 is as follows: a connecting shaft 14 is rotatably penetrated through the sliding seat 11, and two rotating blocks 15 are fixedly connected to the connecting shaft 14. A plurality of cameras 16 are arranged on each rotating block 15. When the angle of the camera 16 needs to be adjusted, rotating the rotating block 15 can drive the camera 16 to rotate, and the operation is simple and fast. Of course, the rotating block 15 will also drive the connecting shaft 14 to rotate. In order to fix the angle of the camera 16, a first friction layer can be arranged on the surface of the connecting shaft 14, and a second friction layer can be arranged on the inner wall of the through hole opened on the sliding seat 11 for the connecting shaft 14 to pass through. The angle of the connecting shaft 14 is fixed through the cooperation of the first friction layer and the second friction layer, so as to achieve the effect of fixing the angle of the camera 16.

[0034] As Figure 2As shown, in order to facilitate students to temporarily place some experimental tools during the experiment, two mutually parallel side baffles 3 are vertically and fixedly arranged on the tabletop 2. The top of the side baffle 3 is fixedly connected with a suspension rod 5 through at least two ejector rods 4, and the suspension rod 5 is fixedly connected with a plurality of hooks 17 extending along the length direction. By arranging the suspension rod 5 and the hooks 17, students can hang some tools on the suspension rod 5 or the hooks 17 during the experiment, which is convenient for students to conduct the experiment.

[0035] As Figure 6 shown, the specific structure of the telescopic rod 19 is as follows: The telescopic rod 19 includes a sleeve 23 vertically and fixedly arranged on a base plate 20. A lifting rod 24 is slidably arranged in the sleeve 23. The upper end of the lifting rod 24 is fixedly connected with a support plate 18. A positioning bolt 25 is passed through the sleeve 23, and the positioning bolt 25 can press the lifting rod 24 against the inner wall of the sleeve 23 to fix the lifting rod 24.

[0036] The present invention further provides a teaching evaluation method, based on a multifunctional experimental device as described above. The method includes S1 to S4.

[0037] S1. Adjust the position of the support assembly on the tabletop 2, and let the students conduct the experiment on the support assembly.

[0038] S2. Adjust the position of the moving rod 8 and the angle of the camera 16 so that the camera 16 can capture the support assembly, and it is necessary to ensure that the moving rod 8 will not interfere with the students' operations, especially that the students' heads will not touch the moving rod 8.

[0039] S3. Use the camera 16 to capture the students' experimental process, and upload the captured experimental video to the monitoring host.

[0040] S4. Use the monitoring host to process the experimental video, and generate a teaching evaluation result based on the processing result.

[0041] Furthermore, the method of using the monitoring host to process the experimental video and generating a teaching evaluation result based on the processing result includes S41 to S45.

[0042] S41. Use the monitoring host to perform frame parsing on the experimental video to obtain a plurality of video frames. When the monitoring host performs frame parsing on the experimental video, it can be based on the existing ffmpeg software, which belongs to the mature existing technology and will not be elaborated here. The extracted video frames are presented in the form of images. Time information can be added to the pictures based on the timestamps in the video frames. Furthermore, according to the correspondence between the camera 16 and the students, the pictures can be named. For example, the student ID number, the device number, the camera number, and the timestamp can be combined as the file name of the image for convenient subsequent calling.

[0043] S42. Use the monitoring host to extract multiple key frames from multiple video frames. During the entire experiment, the experimental video can parse a very large number of video frames. However, most of these video frames cannot be used to evaluate the students' experimental process. These video frames can be called invalid frames. Only a small number of video frames can reflect the students' experimental status. For example, when students conduct an experiment on the reaction of carbon dioxide and calcium hydroxide solution to produce calcium carbonate precipitate, when the clear calcium hydroxide solution becomes turbid, it indicates that calcium carbonate precipitate has been formed. Therefore, the video frames corresponding to this part of the content in the experimental video can be considered key frames. The extraction of key frames can be achieved using existing image recognition algorithms based on artificial intelligence networks, which belongs to mature existing technologies and will not be elaborated here.

[0044] S43. Use the monitoring host to identify the key frames to obtain multiple experimental data. After obtaining the key frames, the monitoring host parses the key frames to further determine the key content in the key frames, such as the distribution of calcium carbonate precipitate in the above-mentioned experiment of the reaction of carbon dioxide and calcium hydroxide solution. Similarly, it can be achieved using existing image recognition algorithms based on artificial intelligence networks, which belongs to mature existing technologies and will not be elaborated here.

[0045] S44. Use the monitoring host to compare the experimental data with the pre-set standard data to obtain the degree of difference. After obtaining the experimental data, compare the experimental data with the standard data pre-determined according to the experimental content to determine whether the students' operations are standardized and whether the experimental results are correct.

[0046] S45. Generate a teaching evaluation result based on all the degrees of difference. During the experimental teaching process, multiple students are usually taught simultaneously, and the experimental results of each student may also be different. If students can successfully complete the experiment and the experimental results meet the expectations, their evaluation results are also better. On the contrary, if students fail to complete the experiment successfully or the experimental results are not ideal, their evaluation results are also relatively poor. By synthesizing the evaluation results of all students, the experimental teaching activities of teachers can be evaluated, so that teachers can continuously improve and optimize the experimental teaching according to the final evaluation results.

[0047] Finally, the present invention provides a teaching evaluation system for implementing the above teaching evaluation method. The system includes a frame processing module, an image recognition module, a data processing module, and an evaluation module.

[0048] The frame processing module is used to perform frame parsing on the experimental video to obtain multiple video frames and extract key frames from the video frames.

[0049] The image recognition module is used to identify the key frames to obtain experimental data.

[0050] A data processing module for comparing experimental data with preset standard data to obtain a degree of difference.

[0051] An evaluation module for generating a teaching evaluation result based on all degrees of difference.

[0052] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein. In the several embodiments provided in the present disclosure, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division, and there can be other division methods in actual implementation. For another example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some communication interfaces, and the indirect couplings or communication connections of the devices or modules can be in electrical, mechanical, or other forms.

[0053] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they can be located in one place or distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0054] Each embodiment in this specification is described in a progressive manner, and the key points of each embodiment are the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0055] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multifunctional experimental device, comprising an experimental bench, the experimental bench including a tabletop (2), a plurality of columns (1) for supporting the tabletop (2), and a back baffle (6) vertically and fixedly arranged on the tabletop (2), characterized in that, A chute (7) parallel to the tabletop (2) is formed on the back baffle (6). A moving rod (8) parallel to the tabletop (2) is slidably arranged in the chute (7), and the moving rod (8) can move along the width direction and the length direction of the tabletop (2). A sliding seat (11) is slidably arranged on the moving rod (8). A plurality of cameras (16) are rotatably connected to the sliding seat (11). All the cameras (16) are wirelessly communicatively connected to a monitoring host together. A plurality of support components are movably arranged on the tabletop (2). The support component includes a substrate (20) arranged on the tabletop (2), a plurality of telescopic rods (19) vertically arranged on the substrate (20), and a support plate (18) fixedly connected to the upper ends of all the telescopic rods (19) together.

2. The multifunctional experimental device according to claim 1, characterized in that, An upper limit plate (21) and a lower limit plate (22) are fixedly connected to a side of the back baffle (6) facing away from the tabletop (2). The upper limit plate (21) and the lower limit plate (22) are parallel to each other, and a distance is left between the upper limit plate (21) and the lower limit plate (22). The moving rod (8) passes through between the upper limit plate (21) and the lower limit plate (22) and is in contact with both the upper limit plate (21) and the lower limit plate (22).

3. A multifunctional experimental device according to claim 1, characterized in that, A first slideway (9) extending along the length direction is formed in the middle of the moving rod (8). The first slideway (9) communicates with a second slideway (10), and the second slideway (10) penetrates the upper surface of the moving rod (8). The sliding seat (11) is fixedly connected with a second sliding part (13). The second sliding part (13) includes a first part slidably arranged in the first slideway (9) and a second part slidably arranged in the second slideway (10).

4. A multifunctional experimental device according to claim 3, characterized in that, The sliding seat (11) is fixedly connected with two parallel first sliding parts (12), and the two first sliding parts (12) are respectively attached to two opposite side walls of the moving rod (8).

5. A multifunctional experimental device according to claim 1, characterized in that A connecting shaft (14) is rotatably penetrated through the sliding seat (11). Two rotating blocks (15) are fixedly connected to the connecting shaft (14). A plurality of the cameras (16) are arranged on each rotating block (15).

6. A multifunctional experimental device according to claim 1, characterized in that, Two parallel side baffles (3) are vertically and fixedly arranged on the tabletop (2). The top of the side baffle (3) is fixedly connected with a suspension rod (5) through at least two top rods (4). The suspension rod (5) is fixedly connected with a plurality of hooks (17) extending along the length direction.

7. A multifunctional experimental device according to claim 1, characterized in that, The telescopic rod (19) includes a sleeve (23) vertically and fixedly arranged on the substrate (20). A lifting rod (24) is slidably arranged in the sleeve (23). The upper end of the lifting rod (24) is fixedly connected with the support plate (18). A positioning bolt (25) is penetrated through the sleeve (23), and the positioning bolt (25) can press the lifting rod (24) against the inner wall of the sleeve (23) to fix the lifting rod (24).

8. A teaching evaluation method, characterized in that: Based on a multifunctional experimental device as described in any one of claims 1-7, the method comprises the following steps: Adjust the position of the support assembly on the tabletop (2), and let the students conduct experiments on the support assembly; Adjust the position of the moving rod (8) and the angle of the camera (16) so that the camera (16) can capture the support assembly; Use the camera (16) to capture the students' experimental process and upload the captured experimental video to the monitoring host; Use the monitoring host to process the experimental video and generate a teaching evaluation result based on the processing result.

9. The teaching evaluation method according to claim 8, characterized in that, The method for using the monitoring host to process the experimental video and generate a teaching evaluation result based on the processing result includes: Use the monitoring host to perform frame parsing on the experimental video to obtain a plurality of video frames; Use the monitoring host to extract a plurality of key frames from the plurality of video frames; Use the monitoring host to identify the key frames to obtain a plurality of experimental data; Use the monitoring host to compare the experimental data with the preset standard data to obtain a degree of difference; Generate the teaching evaluation result based on all the degrees of difference.

10. Teaching evaluation system, characterized in that, For implementing the teaching evaluation method as described in any one of claims 8-9, the system includes: A frame processing module for performing frame parsing on the experimental video to obtain a plurality of the video frames and extracting the key frames from the video frames; An image recognition module for identifying the key frames to obtain the experimental data; A data processing module for comparing the experimental data with the preset standard data to obtain a degree of difference; An evaluation module for generating the teaching evaluation result based on all the degrees of difference.

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