Application of Informational Big Data in Case Study and Collection of Basic Educational Psychology

has shortcomings. First of all, they still use questionnaires to obtain labels. In addition, students’ psychological activities may not only be reflected in their online behavior but also in their other daily behaviors. Big data in higher education plays a crucial role in analyzing and identifying students with psychological abnormalities. As a result, this research mainly extracts the behavioral characteristics of students by cleaning and transforming a large amount of disorganized student school data based on the educational data collected from school cards, academic affairs systems, access control systems, and related business systems. What is more, this study further analyzes the differences in behavioral characteristics between normal and abnormal students through hypothesis testing and finally establishes a model to identify abnormal students and evaluate the results.


Introduction
With the rapid development of information technology, arti cial intelligence and big data are in uencing various industries [1][2][3]. Nowadays, digitalization and informatization in colleges and universities have been promoted and improved, which has increased the amount of data in research results, students' daily behavior, academic performance, and network usage [4]. In this context, nowadays, there are relatively complete application systems among di erent departments of the university, such as academic application systems, access control systems, one-card data systems, and library circulation systems. Each of these systems stores a large amount of student data [5]. However, these data are only stored in the database and are not exploited. erefore, one of the most important issues is that how to use a large amount of data e ectively, analyze the information in the data through data mining technology, make the data into useful information, and accelerate the level of information construction in universities [6]. At the same time, with the arrival of big data, data mining technology has also flourished. Since the 20th century, data mining technology has been widely used in various industries [7]. In the field of education, many universities at home and abroad have started to use data mining technology to analyze educational data in order to understand students' various dynamics in time.
While China has achieved rapid economic development, the mental health of the population also needs attention [8].
To be specific, numerous psychologically related disorders are present in the population. ese mental illnesses have many negative effects and are pervasive and harmful in nature [9]. As a result, mental health has become an important public health issue in our country. At the same time, with the rapid development of the knowledge economy and the increase in the popularity of higher education, the number of college students is increasing, and the number of students with psychological problems is also increasing [10,11]. In recent years, there have been many cases of university students' psychological problems affecting their studies, dropping out of school, and even committing suicide. College students, as part of the high level of talent, have been considered to be outstanding members of society and are expected to have strong psychological qualities [12]. However, the reality is very disappointing. Specifically, the stresses of academics, social relationships, and employment have led to many tragedies that have left college students mentally exhausted [13]. As a result, the timely identification of students with psychological abnormalities has become one of the most essential and challenging issues for universities [14].
Mental health problems can have serious detrimental effects. For the individual, mental health problems can have a number of negative effects on the individual [15]. More seriously, some mental health problems may make individuals less adaptable to society and may even pose a serious threat to their physical health [16]. In addition, mental health problems can be a psychological burden to the family and an economic burden to the family. For society, mental health problems can disrupt public order, consume social resources, and increase the burden of disease on society [17]. As a result, mental health problems account for the majority of the negative effects of all illness-related hazards [18]. However, due to a lack of mental health knowledge and discriminatory attitudes toward the mentally ill, a large number of people with mental health problems are not motivated to seek professional help [19]. erefore, in the context of the new era, how the ideological and political education work of college students can adapt to the policy, the call of the times, and the needs of the education subjects on the basis of maintaining their working principles has become an important issue of the times [20]. In recent years, relevant departments have proposed to attach importance to humanistic care and take it as an important method to strengthen and improve ideological and political work [21]. erefore, psychological education has become one of the ten major education systems for ideological and political work in domestic universities.
is can provide an important basis for the effective combination of ideological and political education and psychological guidance. At the same time, it also shows the future trend of ideological and political work of the party and the country [22]. Psychological guidance plays an indispensable role in daily ideological and political work. For example, during the outbreak of COVID-19 in 2020, psychological guidance played an active role in responding to sudden public events. is has inspired people to pay more attention to humanistic care in the current ideological and political work, always pay attention to students' physical and mental health, and constantly enter their hearts [23]. Only in this way can we better cultivate a healthy social mentality and a sound personality among college students and lead young students to help realize the Chinese dream of the great rejuvenation of the Chinese nation [24].
Currently, research on mental health issues is still dominated by questionnaires. However, there are many shortcomings in this approach. First and foremost, the scale of questionnaires is small. To be specific, both paper and electronic questionnaires require the participation of the subjects. As a result, there are a number of ways to attract subjects [25]. For example, each participant is paid a certain amount of money or a lottery is offered. However, many students are still reluctant to participate. What are more, questionnaires take a certain amount of time. It takes a few minutes to fill out each questionnaire, and some questionnaires can take up to half an hour [26]. Moreover, due to the lack of knowledge about mental health and the discriminatory attitude of college students towards mental health patients, a large number of people with mental health problems hide the truth when answering the questionnaires [27]. is can lead to a large discrepancy between the test results and the real situation. Last but not least, the mental health status of each student changes over time, usually lasting half a month or a month. As a result, if researchers want to know the mental health status afterward, they need to take the test again, which is both labor-intensive and costly. e outbreak of COVID-19 has affected all walks of life, and the teaching format of schools has changed from offline to online. erefore, colleges and universities have become important places for the prevention and control of the epidemic, which makes it more difficult for teachers to grasp the psychological state of mind of students [28]. is urgently requires the ideological and political education work in colleges and universities to insist on the combination of educating the mind and educating people. To be specific, colleges and universities should not only do a good job in ideological and political education but also pay attention to cultivating a sound personality and great psychological quality of college students [29]. As a result, under the background of a diversified society, college students face many problems such as academic pressure, employment pressure, interpersonal relationship trouble, and wrong thinking at home and abroad. In addition, many pressures make the desire to be valued and to have an equal communication status while having a strong sense of self [30].
Psychological counseling is a scientific psychological treatment method and also an important supplement to ideological and political education methods, which plays an important role in improving the educational effect and cultivating a positive and optimistic mindset of college students. In addition, ideological and political education in colleges and universities should meet the inherent demand of improving its effectiveness [31]. Modern ideological and political education should not only adhere to Marxism as the theoretical basis but also draw on the excellent achievements of different disciplines. e application of psychological guidance to ideological and political education in colleges and universities is not only an expansion and innovation of ideological and political education methods but also an effective reference for the new problems in ideological and political work [32]. In practice, ideological and political education should continuously improve its service function and highlight its social function [33].
With the advent of the Internet era, digital campuses have flourished. In this context, the campus life and learning data of college students are gradually recorded in the student management system. ese massive data contain a huge amount of information and provide a better opportunity to understand students' behaviors. is study considers that the psychological status of college students is reflected by their behavioral status in school and is recorded in the relevant system. As a result, the purpose of this study is to identify students with mental health problems by analyzing the massive amount of data on campus and mining the behaviors related to mental health, so that machine learning algorithms can be effectively used to identify students with mental health problems. Furthermore, with the use of information-based big data, counselors can focus on these students based on the identified results and provide them with psychological guidance.

Data Mining.
With the rapid development of computer and network technologies, many human activities are no longer limited by time and space, such as telecommuting and information sharing. Increasingly sophisticated database technologies and pervasive data applications have led to the exponential growth of human data. In this context, people have started to explore the potential information from these massive data, resulting in a variety of data mining techniques. Among them, educational data mining is a new technology created to make full use of the huge data streams that emerge from the operation of digital campuses. To be specific, this technology integrates, classifies, and refines a large amount of data through the comprehensive application of various data mining technologies, thus making it very valuable in the ever-evolving education. As a result, educational data mining refers to a multidirectional and crosscutting research area that encompasses three main disciplines: education, computer science, and statistics. At the same time, their combination has given rise to research areas similar to or related to educational data mining, such as computer-based education, machine learning, data mining, and learning analytics.
As shown in Figure 1, data mining can be generally divided into three phases: data collection and preprocessing, data analysis and mining, and evaluation and visualization of results. e first stage is data collection and preprocessing.
is process mainly includes the collection of target data, the establishment of a data warehouse, data cleaning, data integration, statute and transformation, and other operations. To be specific, data collection and preprocessing are the foundation and key to the whole data mining process. In other words, the quality of data can determine the effect of data analysis and mining. By establishing a unified data warehouse, noise and missing data can be removed or filled with certain rules. Data integration is the unified management of data to facilitate subsequent use. Data preprocessing is a tedious and heavy workload part, but it also lays a solid foundation and support for the subsequent mining analysis. e second stage is the analysis and mining of data. is process is the core part of the whole data mining process. After using the preprocessed data, the data can be extracted, filtered, and modeled by using certain algorithms according to the data mining objectives. e third stage is the evaluation and visualization of the results. Finally, the mining model is evaluated to measure whether the model fulfills the expected tasks and objectives. e results of data mining are analyzed and filtered through certain visualization techniques, and useful results are selected and presented.

Random Forest Algorithm.
e random forest algorithm mainly applies a decision tree as the base classifier, combined with the construction of Bagging, and incorporates the selection of random attributes. As a result, the detailed workflow of the random forest algorithm is illustrated in Figure 2. To be specific, the random forest algorithm can decide the class of samples by voting, and each base classifier has one vote. After that, the category of the sample can be determined based on the principle of majority rule. e randomness of the random forest is reflected in the randomness of attribute selection. Specifically, for each node of the base classifier, k attributes are first randomly selected from the set of attributes of the current node to form a subset. en, the best splitting attribute is computed from the subset according to the attribute selection algorithm, instead of finding the best attribute from all attributes of the current node as in a traditional decision tree. As a result, the introduction of the parameter k reflects the randomness of the random forest algorithm. e random forest algorithm can effectively solve the problem of overfitting easily in decision trees. When dealing with high-dimensional data, it is not necessary to perform dimensionality reduction and feature selection before training because of the random property. In addition, since each tree is trained independently, parallel training can be realized, thus speeding up the training speed. At the same time, the error of the dataset can be balanced according to the error generated by each tree. However, when the noise of the dataset is high, overfitting may occur.

Description of the Hypothesis Test.
Hypothesis testing is a common method used in statistics to determine whether a random variable is consistent with a scientific hypothesis. Its main idea is the small-probability counterfactual method. To be specific, small probability generally refers to the probability of occurrence of 1% or 5% in a single experiment. e counterfactual method is to first formulate a hypothesis and then test it by a statistical method of sampling studies. In fact, the theory and method of determining the probability of the hypothesis are valid based on the principle of small probability, and the theory and method of determining the validity of the hypothesis make up the hypothesis testing. Figure 3 shows the confidence level and rejection domain of the hypothesis test.

Logistic Regression Model.
Logistic regression is the transformation of a linear model into a nonlinear model to predict the actual test values and output as much as possible for a given data set. Although it is called regression, the actual solution is a classification model. Compared with other algorithms, logistic regression is simple, interpretable, and fast to train. As a result, this algorithm is mainly suitable for linear classification problems. e main idea is to fit the decision boundary as closely as possible and output the predicted values. e main idea of logistic regression is to transform the results of linear regression into the   Mobile Information Systems classification of predicted values by mapping them to functions. As a result, the sigmoid function as illustrated in Figure 4 is usually chosen as the mapping function, and its expression is

Confidence level
where z refers to the input value. e model classification results can be optimized by the loss function of the model. When solving for the parameters in the model, the loss function is minimized by using the gradient descent method. e logistic regression classification model is simple to implement, computationally small, and easy to understand and implement. However, when the feature space is large, the classification performance is affected.

Algorithm Framework.
e overall framework of the educational psychological problem identification algorithm based on big data technology is shown in Figure 5. e whole algorithm process is divided into three parts, including data acquisition and preprocessing, feature extraction, and model training and recognition. In the data acquisition and preprocessing stage, four data sources are acquired, namely, weblogs, access control data, achievement data, and consumption data. In the feature extraction stage, relevant features such as students' online patterns and abnormal consumption scores can be extracted from the four data sources. In the model training and identification stage, the optimal classifier is selected among five common classification algorithms.
With the rise of digital campuses, more and more student behavior data are stored. ese data have two characteristics, one is a large amount of data and the other is the complexity and diversity. So far, although various student management systems have been established in various universities in China and abroad, the data collected by these systems are still not well utilized. As a result, it is quite necessary to understand and analyze these data and establish relevant data models.

Student Behavior Characteristics.
In the mining of educational data in colleges and universities, most scholars tend to focus only on the characteristics related to students' performance.
is research focuses on extracting a comprehensive set of behavioral characteristics of students from the Big Five personality traits theory. Based on the original data, this study further extracts and quantifies the characteristics of students' behaviors, aiming at extracting the characteristics that can reflect the students' behaviors in school more intuitively. In addition, based on the basic data of students, the indexes can be established by referring to psychology and pedagogy in order to extract the characteristics of students. In addition, this research constructs a better behavioral profile to measure students' performance in school, so that we can detect abnormal students from their daily behavior.
Indeed, students with psychological abnormalities manifest in different ways in the relatively open and free environment of the university. Most students focus on the Big Five personalities of openness, responsibility, extroversion, agreeableness, and neuroticism ( Figure 6). However, due to limitations in school data, this paper can only analyze certain traits to compare and contrast the differences between psychological abnormalities and normal students in order to better identify students with possible psychological problems from a large number of students promptly.

Social Relationship
Mining. Traditional discovery of buddy networks is usually done by hypothesis testing or clustering. However, hypothesis testing requires the assumption that cooccurrence between students is independent, while clustering results are strongly influenced by the cluster centroids. erefore, the main idea of this study is that the number of cooccurrences between two students is proportional to the probability of two students becoming friends. In other words, this study uses association rules to identify friends. On campus, it is assumed that if two students are friends, they will often be in the same place together, such as eating or spending money together, going to the library together, and so on. is is consistent with the pattern of friendships between college students. As shown in Figure 7, if students X and Y are friends, then students X and Y will be seen together many times.
As information technology and databases continue to evolve and mature, the size of data is exploding. ere are more and more unbalanced data in various industries. However, since most classification algorithms are based on global balanced data, the prediction results of most unbalanced data are not promising. erefore, it is necessary to equalize the data. Currently, there are two main types of unbalanced data processing. e first one is to resample the data from the data level to eliminate the majority samples or expand the minority samples. is can change the distribution of the original data samples and thus improve the imbalance of the data. e other is an improvement of the classification model algorithm. Specifically, the original Mobile Information Systems classification algorithm needs to be improved by introducing a penalty mechanism for misclassification costs so that the algorithm can be applied to unbalanced data. However, due to the diversity of data, unbalanced data usually have their unique characteristics. erefore, it is difficult to improve the algorithm for unbalanced data, and the generalization ability and generalizability are not high. As a result, in general, most experts and scholars solve the unbalanced data problem at the data level.

Conclusion
e traditional way of a questionnaire survey on mental health problems has the problems of easy concealment and small scale. In recent years, a method of identifying mental health problems based on Internet logs has emerged. is method compensates for the shortcomings of questionnaires, but students' behaviors on campus are diverse. To be specific, Internet behavior is only a part of students'  behaviors, and it is not enough to reflect all of their psychological activities. In addition, the method of identifying mental health problems based on Internet logs still uses questionnaires to obtain labels. erefore, the labels are still unreliable. In this paper, we propose a model for mining students' social relationships in school by preprocessing a large amount of messy data and identifying students with psychological abnormalities. Based on this model, this research can extract other behavioral characteristics of students in school and analyze the difference between the performance of psychologically abnormal students and normal students in school. Furthermore, based on the preliminary data processing, a model for identifying students with psychological abnormalities was established to identify students with psychological abnormalities from a large amount of data.
However, the work done and the proposed method in this paper have the following areas for improvement in future research. In the model for identifying students with psychological abnormalities developed in this paper, due to the highly uneven data, the use of dichotomous classification requires data equalization to achieve better identification results. e one-category model is simple, but it does not contribute to the accuracy of the model. erefore, further research is needed to establish a more convenient and accurate model for identifying students with psychological abnormalities based on big data from university education.

Data Availability
e labeled dataset used to support the findings of this study is available from the corresponding author upon request.

Conflicts of Interest
e authors declare that there are no conflicts of interest.