Informatization changes the learning mode of students and changes the teaching mode of teachers. The communication content between teachers and students includes discussions, courseware, assignments, etc. Most of this work is done online. The convenience of obtaining network resources brings certain benefits to teaching work and increases the difficulty for teachers to evaluate students' learning effects. Teachers are increasingly relying on information to solve the problems encountered in the traditional teaching process, such as plagiarism checks and automatic evaluation of English teaching coursework . The network collects students' learning behavior data and conducts statistical analysis through a reasonable model to provide a reasonable basis for plagiarism inspection and automatic evaluation of English teaching coursework. This method has become an important subject of teaching management in colleges and universities.
Plagiarism detection technology is widely used in the field of intellectual property protection. Howie's academic misconduct detection system relies on its huge literature database to detect plagiarism. The ROST anti-plagiarism system of Wuhan University provides the service of judging the similarity between the papers under investigation and the existing literature. Open source plagiarism detection platforms such as Plagiarisma abroad provide plagiarism detection services through the support of search engines.
In the study of the online learning environment by Underwood et al., we found that the sources of student plagiarism are mainly local and global. If all or part of a student's English coursework or dissertation is taken from outside the learning community, this type of plagiarism is called global plagiarism . In global plagiarism, the sources of plagiarism are relatively wide. The content includes the Internet, academic monographs, paper publications, P2P networks, etc. Many commercial and non-commercial systems provide global plagiarism detection services. One of the most famous systems is the Turnitin system developed by the American IPA plagiarism company. The current international mainstream e-learning system. Blackboard, WebCT, ANGEL, and Moodle, etc., are all directly using the Turnitin system of the plug-ins provided by it.
According to the time axis relationship, most of the existing plagiarism detection systems determine the plagiarism relationship . The plagiarist between two papers with a high degree of similarity must be a later publication date. However, there is no necessary relationship between the time sequence of students submitting assignments and the plagiarism of students' assignments, so the relationship of the time axis cannot judge the plagiarism relationship of students' assignments. The homework plagiarism detection module of LMS2.0 can only judge the set of homework that may have a plagiarism relationship. The system cannot determine who is a plagiarist and who is a plagiarized person in this collection. Some scholars have analyzed thesis-type assignments and found a certain relationship between students' usual study habits and their attitude toward assignments. Students who study seriously also take homework relatively seriously. In this study, various learning behavior data of students were recorded in LMS3.0 utilizing the fractional differential equation method . We designed an English online homework-assisted evaluation model based on fractional differential equations based on the original plagiarism detection module. We use this model to solve the problem of determining the plagiarism relationship of students' homework.
The homework-assisted evaluation and correction model based on LMS3.0 is shown in Figure 1. We divide the determination of plagiarism detection into three stages. The first stage is job similarity determination. We use the similarity detection fractional differentiation algorithm to find assignments whose similarity threshold reaches a certain level from assignments submitted by students . The second stage is through the hierarchical clustering method. We cluster assignments with a threshold of similarity to a certain degree according to the source of plagiarism. Output a list of assignments from the same plagiarized source and their corresponding student lists. The third stage assigns different weights to the students' learning behavior and learning result data collected by LMS3.0 according to their reliability and importance. In this way, a learning evaluation weight vector is formed . We use the analytic hierarchy process to calculate the evaluation value of the students in the student list output in the previous step on each evaluation index. This results in a composite score sheet for all student learning using the same plagiarism source. The calculation results provide a basis for judging plagiarists.
This paper uses variational methods to study the structure of the following fractional differential equations with instantaneous and non-instantaneous impulses:
The Riemann-Liouville type fractional integral is denoted by
We assume that
The right Caputo-type fractional derivative is defined as follows:
This paper follows the similarity algorithm in the homework plagiarism detection module of LMS2.0. In the homework plagiarism detection module of LMS2.0, we use asymmetric similarity to judge the similarity between students' homework . We are given two documents a and b. This ratio is also called the inclusion ratio of document a by b. which is expressed as
The purpose of this stage is to cluster assignments that may be plagiarized from each other. This facilitates subsequent determination of who is a plagiarist in each cluster. We adopt the agglomerative hierarchical clustering method to analyze the target documents bottom-up according to the distance between the jobs obtained in the previous stage. Documents with the smallest distances are merged into one class first . And so on until all documents are merged into one class or a certain threshold is reached. We ended up combining all the assignments into one class in this article.
Before clustering, we first treat each document vector as a class. The inter-class distance is the distance 1 −
The hierarchical clustering method is an “Overview of Computer Technology Development” assignment for plagiarism correlation analysis. The results are shown in Figure 2. In Figure 2, the ordinate is the relative distance between the assignments, and the abscissa is the number of the assignments handed in by the students . Hierarchical clustering means that the smaller the correlation distance, the higher the similarity between two documents. Suppose we take 0.1 as the similar job determination threshold. Eight plagiarism sources from the same source were found through hierarchical clustering. More than 90% of the homework plagiarism groups are similar to the plagiarism source.
Judging a plagiarist among several similar assignments is a relatively subjective act. We conducted a detailed analysis of students with plagiarism in LMS2.0 and found a certain correlation between students' daily learning behavior and learning effect and assignment plagiarism . Students with good study habits and learning effects are less likely to plagiarize. Based on this phenomenon, this paper proposes the Analytic Hierarchy Process. We collected five learning evaluation indicators, including unit test result (
In the formula
Combining the above definitions, we can get
Similarly, you can also get
As well as
If the function
The homework-assisted evaluation model proposed in this paper has been applied to the teaching platform of college English majors. In the experiment, we tracked and collected the learning behavior data of about 300 students in 5 courses in the teaching platform. We use the platform's plagiarism detection module to detect 8 of these course papers . We found a total of 47 homework plagiarism groups with a similarity of more than 80%. Table 1 shows the accuracy of the homework-assisted evaluation and correction model for judging plagiarists, including the number of people in the homework plagiarism group.
The relationship between the size of the plagiarism group and the accuracy of plagiarism judgment
When the homework plagiarism group contains a small number of people (2 to 3 people), the judgment accuracy of the auxiliary evaluation model is higher. This means that those with higher learning total evaluation scores are more likely to be non-plagiarism. When the homework plagiarism group contains many people, the judgment accuracy of the auxiliary evaluation model is not ideal. After inspection, it is found that when the same homework plagiarism group contains many people, the learning total evaluation score depends on the latter, the plagiarism probability is higher. However, the basis for judging whether the person with the highest total score in the learning evaluation is a non-plagiarism is not necessarily established.
The English homework-aided assessment model proposed in this paper based on fractional differential equations is ideal for determining homework plagiarism. However, there is a certain error in the judgment of non-plagiarists when the plagiarism group contains a large number of people.
The relationship between the size of the plagiarism group and the accuracy of plagiarism judgment
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