# Prediction of College Employment Rate Based on Big Data Analysis

Authors: Xuhui Dong
Journal: Mathematical Problems in Engineering
 (2021)

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## Abstract

This paper uses big data technology to predict the employment rate of colleges and universities. In this paper, combined with the current rental price, daily life consumption, and college students’ personal interests and hobbies consumption and other indicators, the individual is simulated by big data, and the individual is associated by using the AI-driven edge fog computing service optimization algorithm to form a cluster, so as to realize the prediction from element to neural network cluster by using edge computing. In addition, this paper takes the employment data of colleges and universities in Hunan province from June 2020 to May 2021 as the research sample to test the prediction model and makes a comparative analysis with the CNN model and LSTM model. The edge fog computing model in this paper has more analytical indexes as tuples compared to the CNN model, so the results show that the prediction accuracy can reach 83.25%. In this case, there is little difference between the two models of data processing and predictive efficiency. Compared with the LSTM based classification prediction model, this model is edge computing, which greatly improves the data quality of model and data parameters, and the calculation efficiency can be increased by 45%–65%. Therefore, the use of big data technology can provide a reference for the research direction of higher education.


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## Body

## 1. Introduction

In the analysis and prediction of smart big data employment data, there are a variety of data types. Because different data types have different data structures, the data processing and analysis system will seriously reduce the performance of the system in the process of data extraction for different data structures. In the traditional big data edge computing system, although the user’s private data will not be transferred to other devices and the terminal will upload the local updated data directly to the edge server, there is still the possibility of privacy leakage by uploading data to reverse the user’s private data.Al-Fuqaha et al. proposed a noninteractive edge computing algorithm for big data to ensure privacy. This method can ensure that privacy will not be disclosed even when multiple big data edge computing participants collude [1]. Klas considered how to verify the correctness of server aggregated data while protecting user privacy and proposed a verifiable privacy protection framework for big data edge computing (verifynet) [2]. The analysis method is based on the above problem. To improve communication speed and diminish communication overhead, on the other hand, is gradually becoming an important matter. Zhang suggested that the mobile end should verify the current parameter updates based on the background information from the central server and therefore decide whether to upload its own data to the controller. But while performing the operation of the proposed algorithm, an extra overhead is required by the mobile endpoints to determine when the number of local errors in updates pertains the amount of global aggregation [3]. Yousefpour et al. designed a control algorithm to adjust the times of local update and global aggregation according to the convergence constraints under a given resource, so as to maximize the resource utilization [4].Chen proposed that the premise of the algorithm is that the local update consumes the same amount of resources. Considering the differences in terminals and data size, the resources consumed by local updates must be different, which affects the number of local updates [5]. The communication efficiency of Wang has been improved by speeding up the conversion time of the CNN algorithm. Such method may reduce the communication overhead to a certain extent. But the implementation process of an algorithm still used the CNN framework which does not minimize the time of the model learner [6]. At present, the work of using big data edge computing to protect user privacy in edge computing is relatively small, and although some work has been devoted to research on how to improve the efficiency of big data edge computing, these solutions have more or less some flaws. Therefore, we will study edge intelligent collaborative computing and privacy protection methods based on big data edge computing. Big data edge computing mechanisms are being used to protect user privacy in edge computing, and ways to improve the efficiency of big data edge computing and reduce the cost of mobile devices are being explored [7].This paper uses big data technology to predict the employment rate of colleges and universities. In this paper, combined with the current rental price, daily life consumption, and college students’ personal interests and hobbies consumption and other indicators, the individual is simulated by big data, and the individual is associated by using the AI-driven edge fog computing service optimization algorithm to form a cluster, so as to realize the prediction from element to neural network cluster by using edge computing. In addition, this paper takes the employment data of colleges and universities in Hunan province from June 2020 to May 2021 as the research sample to test the prediction model and makes a comparative analysis with the CNN model and LSTM model.


## 2. Big Data and Edge Computing Prediction Method

### 2.1. Human Resource System and Marginal Computing

Referring to the reform direction of “employee system,” we should create the economic employment mode of “employee system” platform, guide the platform to sign bilateral agreements with workers, clarify the responsibility boundary and legal guarantee obligations of platform employment management, take social insurance participation and minimum service fee guarantee as the necessary conditions for platform employment, and form a new form of labor relations that adapt to the characteristics of newly employed youth [8]. For the shared employment form with a more complex legal relationship, the responsibility of the original employer should be standardized according to the requirements of platform enterprises. At the same time, the platform enterprises are required to sign an agreement with the original employer to agree on the number, time, service location, service mode, compensation standard, and payment form of workers, so as to eliminate the “blank spots” in the protection of rights and interests. We take the newly employed young people as the key guarantee objects of public employment services, establish the platform economy employment status and human resource demand forecast release system, timely release salary, treatment, employment gap, and other information, help enterprises efficiently match human resources, and ensure the transparent employment of young workers [9]. We explore and promote the platform economy “city enterprise linkage” high-quality employment pilot, with policy guidance and list management, standardize the employment behavior of platform economic organizations, and create a number of high-quality employment demonstration platforms [10]. We strengthen the coverage of public employment services, provide a series of employment assistance such as vocational guidance, vocational training, and employment introduction for the newly employed youth who leave their posts for various reasons, take new employment as an important content of youth employment skills training, and help to plan a clear career growth path [11]. As the spokesmen of youth, the communist youth league organizations at all levels should actively adapt to and participate in the reform of labor relations and labor activity organization mode under the development of new industry, build a platform for new employment youth services and rights protection, use new technical means to understand and collect the security demands and concerns of youth employed on the platform, and coordinate relevant departments and platform enterprises to provide a more clear list of rights and interests protection [12]. In the existing youth vocational skills promotion projects organized by the communist youth league at all levels, in view of the characteristics of new employment and the requirements of employment quality, targeted professional technical training and entrepreneurship training projects are carried out to improve the matching degree between the knowledge and skills of young workers and the new needs of productivity development, so as to create a broader career development space for newly employed youth [13].In edge computing, servers are deployed at the edge of the network. The edge server is closer to users, which makes the migration time of computing tasks shorter, so it becomes the preferred platform for computing task execution [14, 15]. However, the resource of the edge server is limited. As the number of mobile devices increases, application functionality becomes more complex, queuing time for computing tasks migrating to edge servers increases, and computing delays increase [16, 17]. At the same time, it is inevitable that users’ privacy information will be included in the computing task of migrating to the server [18]. This information is stored in the server, making the user uncontrollable to the private data [19, 20].


### 2.2. Edge Computing Model

Within the coverage of an edge computing server, there arem users using one mobile terminal [21]. D represents the set of M mobile terminals, and DM represents the m-th mobile terminal [22–26]. In total, n rounds of global updates are needed to meet the requirements of big data edge computing or model convergence to stop learning:(1)DM=M/∑i=1n∑j=1nwijxi−x¯xj−x¯∑i=1n∑j=1nwijxi−x¯2=D∗∑i=1n∑i≠jnwijxi−x¯xj−x¯Rn2∑i=1n∑j=1nwij.RN (1 ≤n ≤ n) represents the set of mobile terminals participating in the nth round of aggregation [24, 25]. The architecture of the edge computing system based on big data edge computing is as follows:(2)Rnssim=1−2μxμy+C12σxy+N2μx2+μy2+C1σx2+σy2+N2,(3)N=βX+In−αW−1ε,(4)W1=s−p1−x1,x−p2−1−x1.This white paper considers the key generation platform to be a completely reliable platform. In addition, all devices, including all terminals and edge servers, run programs according to big data edge computing protocols but do not preclude the possibility of trying to retrieve the private data of other users. This setting is also widely used as the basis for protecting the privacy of big data edge computing [26, 27]. In big data edge computing, the global aggregation algorithm of the server is(5)lnNit=a0+a1W∗dt+∑i=1NbjXu+εu,(6)M=Dm∩GTGT.The whole process of privacy protection mechanism is shown in(7)lnDMit=a0+a1Rn∗dt∗W+∑i=1NbjW+εu.Letn denote whether DM participates in the nth round of aggregation(8)Dm=αWy+n1X−Wβ2X+ε.Suppose that in the nth round of global aggregation, the clock period of DM processing a sample is cm,n. The data set used by a local update of a terminal is consistent. Suppose that DM local data set has SM samples in total. DM is used to calculate the sample time:(9)In−α∗N3y=In−α∗CM3Xβ+ε.Where FM is the dominant frequency of DM, the calculation method is as follows:(10)Fm=100%×1−SEG−GTGT.GT is the effective capacitance coefficient of DM in the nth round. Suppose that in the nth round, the amount of data transferred between DM and the server isn, and the calculation expression is as follows:(11)GTκ=2kk+1+12+12kc2−c132+2c2−c13.In the nth round, the calculation expression of transmission energy consumption MEM generated by DM is as follows:(12)Xiou=1−∑a=1H∑b=1WSEGa,bGTa,b∑a=1H∑b=1WSEGa,b+GTa,b−SEGa,bGTa,b,where PM, n represents the transmission power of DM, N in the nth round. The time cost t of all terminals in the whole running period of the model is calculated as follows:(13)Pdi,wj=PdiPwj|di;Pwj|di=∑k=1KPwj|zkPzk|di.In the process of communication between the terminal and the server, the channel propagation time is relatively small, so the time overhead is ignored in this paper. The energy consumption of all terminals during big data edge computing is expressed ase, and the calculation method is as follows:(14)λm=2Λm∩GTΛm+GTdm.λM is the learning accuracy of DM after the big data edge calculation, that is, the sample accuracy of DM learning, and ΛM is the target learning accuracy of DM. In the whole process, the processes that have a great influence on the performance and learning efficiency of big data edge computing include participant selection, local update, and global aggregation. The calculation expression of model parameter WN in the (n + 1) round is as follows:(15)FedAvgWn+1=s−p1−kx2,x−p2−k1−x2.This way of parameter aggregation may cause the accuracy of some participants in the next round to be lower than that in the previous round because the server considers all participants equally and ignores the influence between participants.


## 2.1. Human Resource System and Marginal Computing

Referring to the reform direction of “employee system,” we should create the economic employment mode of “employee system” platform, guide the platform to sign bilateral agreements with workers, clarify the responsibility boundary and legal guarantee obligations of platform employment management, take social insurance participation and minimum service fee guarantee as the necessary conditions for platform employment, and form a new form of labor relations that adapt to the characteristics of newly employed youth [8]. For the shared employment form with a more complex legal relationship, the responsibility of the original employer should be standardized according to the requirements of platform enterprises. At the same time, the platform enterprises are required to sign an agreement with the original employer to agree on the number, time, service location, service mode, compensation standard, and payment form of workers, so as to eliminate the “blank spots” in the protection of rights and interests. We take the newly employed young people as the key guarantee objects of public employment services, establish the platform economy employment status and human resource demand forecast release system, timely release salary, treatment, employment gap, and other information, help enterprises efficiently match human resources, and ensure the transparent employment of young workers [9]. We explore and promote the platform economy “city enterprise linkage” high-quality employment pilot, with policy guidance and list management, standardize the employment behavior of platform economic organizations, and create a number of high-quality employment demonstration platforms [10]. We strengthen the coverage of public employment services, provide a series of employment assistance such as vocational guidance, vocational training, and employment introduction for the newly employed youth who leave their posts for various reasons, take new employment as an important content of youth employment skills training, and help to plan a clear career growth path [11]. As the spokesmen of youth, the communist youth league organizations at all levels should actively adapt to and participate in the reform of labor relations and labor activity organization mode under the development of new industry, build a platform for new employment youth services and rights protection, use new technical means to understand and collect the security demands and concerns of youth employed on the platform, and coordinate relevant departments and platform enterprises to provide a more clear list of rights and interests protection [12]. In the existing youth vocational skills promotion projects organized by the communist youth league at all levels, in view of the characteristics of new employment and the requirements of employment quality, targeted professional technical training and entrepreneurship training projects are carried out to improve the matching degree between the knowledge and skills of young workers and the new needs of productivity development, so as to create a broader career development space for newly employed youth [13].In edge computing, servers are deployed at the edge of the network. The edge server is closer to users, which makes the migration time of computing tasks shorter, so it becomes the preferred platform for computing task execution [14, 15]. However, the resource of the edge server is limited. As the number of mobile devices increases, application functionality becomes more complex, queuing time for computing tasks migrating to edge servers increases, and computing delays increase [16, 17]. At the same time, it is inevitable that users’ privacy information will be included in the computing task of migrating to the server [18]. This information is stored in the server, making the user uncontrollable to the private data [19, 20].


## 2.2. Edge Computing Model

Within the coverage of an edge computing server, there arem users using one mobile terminal [21]. D represents the set of M mobile terminals, and DM represents the m-th mobile terminal [22–26]. In total, n rounds of global updates are needed to meet the requirements of big data edge computing or model convergence to stop learning:(1)DM=M/∑i=1n∑j=1nwijxi−x¯xj−x¯∑i=1n∑j=1nwijxi−x¯2=D∗∑i=1n∑i≠jnwijxi−x¯xj−x¯Rn2∑i=1n∑j=1nwij.RN (1 ≤n ≤ n) represents the set of mobile terminals participating in the nth round of aggregation [24, 25]. The architecture of the edge computing system based on big data edge computing is as follows:(2)Rnssim=1−2μxμy+C12σxy+N2μx2+μy2+C1σx2+σy2+N2,(3)N=βX+In−αW−1ε,(4)W1=s−p1−x1,x−p2−1−x1.This white paper considers the key generation platform to be a completely reliable platform. In addition, all devices, including all terminals and edge servers, run programs according to big data edge computing protocols but do not preclude the possibility of trying to retrieve the private data of other users. This setting is also widely used as the basis for protecting the privacy of big data edge computing [26, 27]. In big data edge computing, the global aggregation algorithm of the server is(5)lnNit=a0+a1W∗dt+∑i=1NbjXu+εu,(6)M=Dm∩GTGT.The whole process of privacy protection mechanism is shown in(7)lnDMit=a0+a1Rn∗dt∗W+∑i=1NbjW+εu.Letn denote whether DM participates in the nth round of aggregation(8)Dm=αWy+n1X−Wβ2X+ε.Suppose that in the nth round of global aggregation, the clock period of DM processing a sample is cm,n. The data set used by a local update of a terminal is consistent. Suppose that DM local data set has SM samples in total. DM is used to calculate the sample time:(9)In−α∗N3y=In−α∗CM3Xβ+ε.Where FM is the dominant frequency of DM, the calculation method is as follows:(10)Fm=100%×1−SEG−GTGT.GT is the effective capacitance coefficient of DM in the nth round. Suppose that in the nth round, the amount of data transferred between DM and the server isn, and the calculation expression is as follows:(11)GTκ=2kk+1+12+12kc2−c132+2c2−c13.In the nth round, the calculation expression of transmission energy consumption MEM generated by DM is as follows:(12)Xiou=1−∑a=1H∑b=1WSEGa,bGTa,b∑a=1H∑b=1WSEGa,b+GTa,b−SEGa,bGTa,b,where PM, n represents the transmission power of DM, N in the nth round. The time cost t of all terminals in the whole running period of the model is calculated as follows:(13)Pdi,wj=PdiPwj|di;Pwj|di=∑k=1KPwj|zkPzk|di.In the process of communication between the terminal and the server, the channel propagation time is relatively small, so the time overhead is ignored in this paper. The energy consumption of all terminals during big data edge computing is expressed ase, and the calculation method is as follows:(14)λm=2Λm∩GTΛm+GTdm.λM is the learning accuracy of DM after the big data edge calculation, that is, the sample accuracy of DM learning, and ΛM is the target learning accuracy of DM. In the whole process, the processes that have a great influence on the performance and learning efficiency of big data edge computing include participant selection, local update, and global aggregation. The calculation expression of model parameter WN in the (n + 1) round is as follows:(15)FedAvgWn+1=s−p1−kx2,x−p2−k1−x2.This way of parameter aggregation may cause the accuracy of some participants in the next round to be lower than that in the previous round because the server considers all participants equally and ignores the influence between participants.


## 3. Experimental Design

### 3.1. Research Methods

This paper uses big data technology to predict the employment rate of colleges and universities. In this paper, combined with the current rental price, daily life consumption, and college students’ personal interests and hobbies consumption and other indicators, the individual is simulated by big data, and the individual is associated by using the AI-driven edge fog computing service optimization algorithm to form a cluster, so as to realize the prediction from element to neural network cluster by using edge computing. In addition, this paper takes the employment data of colleges and universities in Hunan province from June 2020 to May 2021 as the research sample to test the prediction model and makes a comparative analysis with the CNN model and LSTM model.


### 3.2. Experimental Design

In the calculation of employment data, there are many types of data acquired by terminal equipment, so the transmission message can be unified to reduce the pressure of system processing and identification. Assuming that there aren types of data that may be included in the calculation of employment data, then each device can obtain m (m ≤ n) types of data; then, the information entropy of the number of types of employment data is the length of the data type code we need. In this paper, the fixed-length coding method is used to encode n data types, and the coding length L is obtained according to Definition 1. Starting from the binary number 0, it corresponds to the employment data type one by one in the form of self-increment and forms a unique ID code for each data type. For the data content, because the length of the employment data content is different, this paper adopts the hard coding method and sets the data length of each type of data directly in the perception node.In the process of filtering large-scale employment data, each terminal device needs to have the ability to filter data independently. In order to solve the problem of terminal equipment independent filtering, this paper proposes a data filtering scheme based on Gaussian membership analysis. This algorithm calculates the big data edge calculation of employment data and the big data edge calculation of data difference change to obtain the joint membership of the data [28]. Big data edge computing describes the membership degree of data corresponding to the whole from the perspective of data distribution. Big data edge computing discusses the possibility of continuous data when data changes from the perspective of data difference change distribution. The joint membership degree of data reflects its trustworthiness and subordination to the whole data. The higher the degree of membership, the higher the credibility of data. At the same time, combined with the spatiotemporal correlation of data, this paper puts forward the abnormal data filtering based on mobile edge cloud, which further improves the ability of data mining and analysis.


## 3.1. Research Methods

This paper uses big data technology to predict the employment rate of colleges and universities. In this paper, combined with the current rental price, daily life consumption, and college students’ personal interests and hobbies consumption and other indicators, the individual is simulated by big data, and the individual is associated by using the AI-driven edge fog computing service optimization algorithm to form a cluster, so as to realize the prediction from element to neural network cluster by using edge computing. In addition, this paper takes the employment data of colleges and universities in Hunan province from June 2020 to May 2021 as the research sample to test the prediction model and makes a comparative analysis with the CNN model and LSTM model.


## 3.2. Experimental Design

In the calculation of employment data, there are many types of data acquired by terminal equipment, so the transmission message can be unified to reduce the pressure of system processing and identification. Assuming that there aren types of data that may be included in the calculation of employment data, then each device can obtain m (m ≤ n) types of data; then, the information entropy of the number of types of employment data is the length of the data type code we need. In this paper, the fixed-length coding method is used to encode n data types, and the coding length L is obtained according to Definition 1. Starting from the binary number 0, it corresponds to the employment data type one by one in the form of self-increment and forms a unique ID code for each data type. For the data content, because the length of the employment data content is different, this paper adopts the hard coding method and sets the data length of each type of data directly in the perception node.In the process of filtering large-scale employment data, each terminal device needs to have the ability to filter data independently. In order to solve the problem of terminal equipment independent filtering, this paper proposes a data filtering scheme based on Gaussian membership analysis. This algorithm calculates the big data edge calculation of employment data and the big data edge calculation of data difference change to obtain the joint membership of the data [28]. Big data edge computing describes the membership degree of data corresponding to the whole from the perspective of data distribution. Big data edge computing discusses the possibility of continuous data when data changes from the perspective of data difference change distribution. The joint membership degree of data reflects its trustworthiness and subordination to the whole data. The higher the degree of membership, the higher the credibility of data. At the same time, combined with the spatiotemporal correlation of data, this paper puts forward the abnormal data filtering based on mobile edge cloud, which further improves the ability of data mining and analysis.


## 4. Results and Discussion

### 4.1. Big Data Edge Computing University Employment Rate Analysis

As shown in Figure1, after passing through the filter, the data is divided into abnormal data, suspicious data, and reasonable data. We upload suspicious data and reasonable data and filter out abnormal data locally. The filtering algorithm based on big data edge computing can only solve the problem of data filtering in the normal data range. However, if there are special cases, mobile edge computing can help the employment data calculation to consider the problem of data anomaly from a higher dimension.Figure 1
Data filtering for normal data range.As shown in Figure2, the big data edge computing method proposed in this paper can greatly reduce the time and energy consumption of big data edge computing compared with the CNN method and LSTM method under the condition that the learning accuracy of each terminal reaches a certain value. At the same time, the privacy protection mechanism proposed in this paper is further optimized, and a more complete mechanism based on a big data edge computing framework to protect user privacy in edge computing is designed.Figure 2
Terminal big data edge computing time and energy consumption.As shown in Figure3, although the proportion of determined outliers is relatively accurate, for some nodes with concentrated outlier data, this method of outlier filtering cannot achieve accurate filtering. In addition, the method of the isolated forest is used to filter abnormal data. In the algorithm of the isolated forest, the proportion of outliers is set to 0.005 in the quartile outlier filtering algorithm, and the experimental results determine the proportion of outlier data more accurately. In this experiment, the proportion of outlier data determined in the quartile algorithm is used as the proportion of outlier data of this algorithm.Figure 3
Abnormal data filtering based on the method of the isolated forest.As shown in Figure4, in node 1, node 3, and node 6, the proportion of abnormal data is very small and even can be recorded as no abnormal data, so the algorithm does not filter the data set. However, from the experimental results of the isolated forest algorithm, we can see that because the proportion of abnormal data is specified, the algorithm will definitely determine some data as abnormal data, but in practical application, these data are actually normal data. In the experiment, after the completion of abnormal data detection, the linear filling method is used to fill the data detected as abnormal values. This method is relatively simple and can smooth out the abnormal data. It can often replace the data that does not change significantly and changes continuously, such as the temperature data. Simulation results show that the algorithm has a better ability to filter abnormal data and is more robust.Figure 4
Proportion of abnormal data in big data edge algorithms.As shown in Table1, this paper proposes a data filtering method based on big data edge computing analysis. By calculating the edge computing degree of big data, the data is preliminarily filtered. At the same time, based on mobile edge computing, this paper proposes a multinode joint filtering method, which further improves the accuracy of data mining analysis. Simulation results show that the algorithm has a better ability to filter abnormal data, and it is more robust for different real physical data sets. However, the algorithm also has some limitations; for example, it needs enough prior information; the time complexity of the algorithm is relatively high; in addition, it needs to manually specify the membership threshold and the threshold of the number of suspicious nodes, which may need to be continuously optimized for different data sets. Therefore, in the next research, the complexity of the algorithm will be further optimized for different data sets; the design algorithm can automatically determine the membership threshold and the number of nodes threshold.Table 1
Accuracy of data mining analysis.
ItemEmploymentNot righteousProfessionalsLow levelCore materialProfessionals3.31.895.75.493.85Skill2.431.11.371.883.15Not solid5.133.114.956.911.02No clear4.036.071.063.816.71Occupation5.812.994.196.235.66Comprehensive2.083.082.453.263.34If the proportion of time delay and energy consumption in the integrated load is reset, the results of the optimal unloading algorithm will also change, as shown in Table2. In the table, noff is the number of offloads. It can be seen that with the decrease of the proportion of energy consumption in the comprehensive load, the number of offloads of end-users increases. This is because the unit computing energy consumption of each edge node in the example is relatively small compared with the standby computing node and cloud platform. In the case of not considering the delay and only considering the energy consumption, the end nodes prefer not to offload tasks. On the other hand, the computing power of the edge node is not as strong as that of the standby computing node and the cloud, and it takes more time to calculate the same task. If the time delay accounts for a higher proportion in the comprehensive load evaluation, the edge node tends to unload the task to the standby edge computing node or the cloud for processing, and the specific number of unloaded tasks is determined by the results of the optimized unloading strategy.Table 2
Computing power of edge nodes.
ItemTargeted employmentSelf-employedFlexibleCivil servantsBusiness unitNot solid0.830.751.071.81.66No clear2.872.373.821.153.06Occupation5.974.384.214.932.81Career5.622.412.524.975.61Planning3.134.512.314.394.84Lack4.053.84.056.684.05The task offloading model is compared with the traditional cloud computing model and all in the local computing model. In the case that each terminal has different acceptance preferences for delay and energy consumption, the delay and energy consumption of different computing methods (all in local, all uploaded to the cloud, task offloading combined with edge computing) are compared and analyzed. Energy consumption and comprehensive load (after normalization) are shown in Table3. The mobile edge computing layer allows you to jointly analyze data from multiple nodes and determine potential data anomalies. If the data uploaded by many nodes is suspicious, it can be considered the result of anomalous changes in the environment. For example, if the temperature drops suddenly, the temperature data collected by all nodes will drop sharply, and then such data belongs to normal data. By setting the threshold of the number of suspicious nodes, when the number of nodes reporting suspicious changes is greater than the threshold of the number of suspicious nodes, the suspicious changes of data are considered as normal changes. If it is less than this threshold, the suspicious change of data is considered as abnormal change, and filtering is carried out.Table 3
Joint analysis of data from multiple nodes.
ItemTargetedSelf-employedEmploymentCivil servantsBusinessRecruitmentLSTM2.652.113.512.42.265.55CNN4.832.645.143.463.952.96Career1.7463.52.192.794.45Planning3.391.884.194.63.425.03Lack1.893.012.772.233.396.04Practice6.164.413.374.464.875.38As shown in Figure5, the time delay, energy consumption, and comprehensive load of all local computing are the largest among the three computing methods. This is mainly because the computing module of the edge computing node is not its main function module, so the computing capacity is insufficient and the power consumption is high. If all of them are uploaded to the cloud, the main energy consumption is reflected in the upload and download of calculation data and results. The comprehensive load after Nash equilibrium is the smallest of the three calculation methods. The above is based on the preference of each terminal, and the proportion of energy consumption and delay is different.Figure 5
Computing module of an edge computing node.We change the proportion of energy consumption and delay and analyze three calculation methods, as shown in Table4. It can be found that when the terminal is more sensitive to delay, the advantages of optimal offloading will be greatly reflected. The main reason is that cloud computing needs to concentrate on decision-making tasks, and the computing tasks uploaded from the edge nodes need a larger queuing delay; considering the intelligent development of residential load, the preference of various terminals for time delay and energy consumption will be quite different. Nonintrusive power monitoring equipment is more sensitive to time, while photovoltaic equipment is less sensitive to time delay. In this trend, if all of the edge terminal facilities are used for local computing or all of them are uploaded to the cloud for centralized computing, the global optimization cannot be achieved, the optimal offloading computing mode achieves the equilibrium solution through the global game, and the optimal offloading decision is selected. Compared with the traditional edge-cloud cooperation model (without standby edge node participation) and the task offloading model with standby edge node participation, the existing researches consider the application scenarios, and most of the task offloading only includes the participation of both the edge node and the cloud platform, reduces the risk of data loss when uploading to the cloud, and ensures the security and privacy of information transmission.Table 4
Big data edge algorithm time sensitivity.
YearTargeted employmentSelf-employedFlexible employmentCivil servants20163.972.253.323.9320173.463.192.562.7201842.894.693.0820192.042.11.83.220206.043.263.27120214.55.531.383.22In addition, the simulation results show that the task offloading model with spare edge nodes is better than the traditional edge-cloud cooperation model without spare edge nodes in terms of time delay and energy consumption. Similarly, 50 terminal devices with different computing tasks, computing power, and sensitivity to delay energy consumption in the example are compared under the two models, and the results are shown in Figure6. When updating locally, participants learn through big data edge computing. In the parameter aggregation phase, a simple average aggregation method is used. As one of the most classic algorithms of big data edge computing, this method has been used as a comparison method in many articles related to big data edge computing.Figure 6
Traditional edge-cloud collaboration model involving edge nodes.As shown in Figure7, the accuracy of most terminals in q-fedsgd is less than the target accuracy. In flbec, only D5 fails to achieve the target accuracy, which indicates that the big data edge computing algorithm can ensure the learning accuracy of the terminal. The difference between the learning accuracy of each terminal and the target accuracy under the three algorithms is shown in the figure, from which we can see the effect of each algorithm in ensuring the learning accuracy. Because CNN can ensure the learning accuracy in big data edge computing, this paper takes 0.99 times of the terminal learning accuracy after running as the target accuracy of each terminal in the big data edge computing algorithm.Figure 7
Employment data training test.As shown in Figure8, from 2016 to 2021, in terms of income, the average monthly pretax income of the formal employment group is 4232 yuan, and the average monthly pretax income of the informal group is 3503 yuan, which is 20.8% less than that of the formal employment group. Through the quantile statistics, we can find that the income of the informal employment group is not more than that of the formal employment group at each quantile point, and the income gap at each quantile point is basically uniform. Mann–Whitney test is used to analyze whether there are significant differences among different groups of employment forms in order to judge whether there is selection bias in the choice of employment forms. This paper uses the propensity score matching method to balance the selection bias in the choice of employment forms, estimates the average processing effect (ATT) on the basis of controlling the selection bias of employment forms, and analyzes whether and to what extent the two employment forms lead to the income difference of university graduates. Based on the decomposition of wage difference in the form of employment, the two economic schools put forward different theoretical views on the wage determination mechanism.Figure 8
Forms of employment selection bias.As shown in Figure9, compared with the CNN model, the edge fog calculation model in this paper has more available analysis indexes as tuples, so the accuracy rate of prediction can reach 83.25%. In this case, the difference between the two models in data processing and prediction efficiency is small. Compared with the LSTM-based classification prediction model, this model is edge computing, which greatly improves the data quality of the model and data parameters, and the calculation efficiency can be increased by 45%–65%. Therefore, the use of big data technology can provide a reference for the research direction of higher education.Figure 9
Different combinations of employment forecast rates.


### 4.2. Discussion

The computing capacity of employment data is precious and limited, so it is particularly important to allocate resources reasonably. Mobile edge computing sinks the function of cloud computing center to edge cloud, making the cloud computing center closer to the resource demand side. In the face of large data throughput scenarios, the use of distributed processing method can effectively reduce the overall transmission delay of the network and improve the processing efficiency of the system. Now, abnormal data processing of employment data has been widely used in many aspects of employment data calculation. This paper explores the abnormal data detection of large-scale employment data. This paper explores how to monitor abnormal data in wireless sensor networks. This paper explores the problem of abnormal data processing in employment data single application and explores the problem of abnormal data processing in local sensor networks. However, a single application scenario data solution may rely on the unique characteristics of the application data, resulting in the fact that the method is not universal. At the same time, the solution of abnormal data in the local network cannot meet the “multidata, multitask” scenario of the employment data scale, so this paper proposes a distributed abnormal filtering algorithm for heterogeneous data of employment data level.Under the influence of mercantilism, the efficiency of the service industry in developed countries was generally higher than that of the manufacturing industry in history, but it was after the establishment of the Ford system that the modern sector got sustainable development. Therefore, the characteristics of industrial structure in contemporary developed countries are as follows: the service industry dominates economic growth and forms the linkage of high-end service industry and industrial efficiency improvement. The high-end service industry is reflected in the rapid development of the modern knowledge-intensive service industry. The development of science, education, culture and health, financial information, and other industries not only endows the service industry with high efficiency but also promotes industrial integration. In contrast, in developing countries in the process of modernization, the higher proportion of service industry mostly comes from traditional industries, which is different from the essence of structural service in developed countries in that the service industry cannot provide sustainable efficiency compensation.


## 4.1. Big Data Edge Computing University Employment Rate Analysis

As shown in Figure1, after passing through the filter, the data is divided into abnormal data, suspicious data, and reasonable data. We upload suspicious data and reasonable data and filter out abnormal data locally. The filtering algorithm based on big data edge computing can only solve the problem of data filtering in the normal data range. However, if there are special cases, mobile edge computing can help the employment data calculation to consider the problem of data anomaly from a higher dimension.Figure 1
Data filtering for normal data range.As shown in Figure2, the big data edge computing method proposed in this paper can greatly reduce the time and energy consumption of big data edge computing compared with the CNN method and LSTM method under the condition that the learning accuracy of each terminal reaches a certain value. At the same time, the privacy protection mechanism proposed in this paper is further optimized, and a more complete mechanism based on a big data edge computing framework to protect user privacy in edge computing is designed.Figure 2
Terminal big data edge computing time and energy consumption.As shown in Figure3, although the proportion of determined outliers is relatively accurate, for some nodes with concentrated outlier data, this method of outlier filtering cannot achieve accurate filtering. In addition, the method of the isolated forest is used to filter abnormal data. In the algorithm of the isolated forest, the proportion of outliers is set to 0.005 in the quartile outlier filtering algorithm, and the experimental results determine the proportion of outlier data more accurately. In this experiment, the proportion of outlier data determined in the quartile algorithm is used as the proportion of outlier data of this algorithm.Figure 3
Abnormal data filtering based on the method of the isolated forest.As shown in Figure4, in node 1, node 3, and node 6, the proportion of abnormal data is very small and even can be recorded as no abnormal data, so the algorithm does not filter the data set. However, from the experimental results of the isolated forest algorithm, we can see that because the proportion of abnormal data is specified, the algorithm will definitely determine some data as abnormal data, but in practical application, these data are actually normal data. In the experiment, after the completion of abnormal data detection, the linear filling method is used to fill the data detected as abnormal values. This method is relatively simple and can smooth out the abnormal data. It can often replace the data that does not change significantly and changes continuously, such as the temperature data. Simulation results show that the algorithm has a better ability to filter abnormal data and is more robust.Figure 4
Proportion of abnormal data in big data edge algorithms.As shown in Table1, this paper proposes a data filtering method based on big data edge computing analysis. By calculating the edge computing degree of big data, the data is preliminarily filtered. At the same time, based on mobile edge computing, this paper proposes a multinode joint filtering method, which further improves the accuracy of data mining analysis. Simulation results show that the algorithm has a better ability to filter abnormal data, and it is more robust for different real physical data sets. However, the algorithm also has some limitations; for example, it needs enough prior information; the time complexity of the algorithm is relatively high; in addition, it needs to manually specify the membership threshold and the threshold of the number of suspicious nodes, which may need to be continuously optimized for different data sets. Therefore, in the next research, the complexity of the algorithm will be further optimized for different data sets; the design algorithm can automatically determine the membership threshold and the number of nodes threshold.Table 1
Accuracy of data mining analysis.
ItemEmploymentNot righteousProfessionalsLow levelCore materialProfessionals3.31.895.75.493.85Skill2.431.11.371.883.15Not solid5.133.114.956.911.02No clear4.036.071.063.816.71Occupation5.812.994.196.235.66Comprehensive2.083.082.453.263.34If the proportion of time delay and energy consumption in the integrated load is reset, the results of the optimal unloading algorithm will also change, as shown in Table2. In the table, noff is the number of offloads. It can be seen that with the decrease of the proportion of energy consumption in the comprehensive load, the number of offloads of end-users increases. This is because the unit computing energy consumption of each edge node in the example is relatively small compared with the standby computing node and cloud platform. In the case of not considering the delay and only considering the energy consumption, the end nodes prefer not to offload tasks. On the other hand, the computing power of the edge node is not as strong as that of the standby computing node and the cloud, and it takes more time to calculate the same task. If the time delay accounts for a higher proportion in the comprehensive load evaluation, the edge node tends to unload the task to the standby edge computing node or the cloud for processing, and the specific number of unloaded tasks is determined by the results of the optimized unloading strategy.Table 2
Computing power of edge nodes.
ItemTargeted employmentSelf-employedFlexibleCivil servantsBusiness unitNot solid0.830.751.071.81.66No clear2.872.373.821.153.06Occupation5.974.384.214.932.81Career5.622.412.524.975.61Planning3.134.512.314.394.84Lack4.053.84.056.684.05The task offloading model is compared with the traditional cloud computing model and all in the local computing model. In the case that each terminal has different acceptance preferences for delay and energy consumption, the delay and energy consumption of different computing methods (all in local, all uploaded to the cloud, task offloading combined with edge computing) are compared and analyzed. Energy consumption and comprehensive load (after normalization) are shown in Table3. The mobile edge computing layer allows you to jointly analyze data from multiple nodes and determine potential data anomalies. If the data uploaded by many nodes is suspicious, it can be considered the result of anomalous changes in the environment. For example, if the temperature drops suddenly, the temperature data collected by all nodes will drop sharply, and then such data belongs to normal data. By setting the threshold of the number of suspicious nodes, when the number of nodes reporting suspicious changes is greater than the threshold of the number of suspicious nodes, the suspicious changes of data are considered as normal changes. If it is less than this threshold, the suspicious change of data is considered as abnormal change, and filtering is carried out.Table 3
Joint analysis of data from multiple nodes.
ItemTargetedSelf-employedEmploymentCivil servantsBusinessRecruitmentLSTM2.652.113.512.42.265.55CNN4.832.645.143.463.952.96Career1.7463.52.192.794.45Planning3.391.884.194.63.425.03Lack1.893.012.772.233.396.04Practice6.164.413.374.464.875.38As shown in Figure5, the time delay, energy consumption, and comprehensive load of all local computing are the largest among the three computing methods. This is mainly because the computing module of the edge computing node is not its main function module, so the computing capacity is insufficient and the power consumption is high. If all of them are uploaded to the cloud, the main energy consumption is reflected in the upload and download of calculation data and results. The comprehensive load after Nash equilibrium is the smallest of the three calculation methods. The above is based on the preference of each terminal, and the proportion of energy consumption and delay is different.Figure 5
Computing module of an edge computing node.We change the proportion of energy consumption and delay and analyze three calculation methods, as shown in Table4. It can be found that when the terminal is more sensitive to delay, the advantages of optimal offloading will be greatly reflected. The main reason is that cloud computing needs to concentrate on decision-making tasks, and the computing tasks uploaded from the edge nodes need a larger queuing delay; considering the intelligent development of residential load, the preference of various terminals for time delay and energy consumption will be quite different. Nonintrusive power monitoring equipment is more sensitive to time, while photovoltaic equipment is less sensitive to time delay. In this trend, if all of the edge terminal facilities are used for local computing or all of them are uploaded to the cloud for centralized computing, the global optimization cannot be achieved, the optimal offloading computing mode achieves the equilibrium solution through the global game, and the optimal offloading decision is selected. Compared with the traditional edge-cloud cooperation model (without standby edge node participation) and the task offloading model with standby edge node participation, the existing researches consider the application scenarios, and most of the task offloading only includes the participation of both the edge node and the cloud platform, reduces the risk of data loss when uploading to the cloud, and ensures the security and privacy of information transmission.Table 4
Big data edge algorithm time sensitivity.
YearTargeted employmentSelf-employedFlexible employmentCivil servants20163.972.253.323.9320173.463.192.562.7201842.894.693.0820192.042.11.83.220206.043.263.27120214.55.531.383.22In addition, the simulation results show that the task offloading model with spare edge nodes is better than the traditional edge-cloud cooperation model without spare edge nodes in terms of time delay and energy consumption. Similarly, 50 terminal devices with different computing tasks, computing power, and sensitivity to delay energy consumption in the example are compared under the two models, and the results are shown in Figure6. When updating locally, participants learn through big data edge computing. In the parameter aggregation phase, a simple average aggregation method is used. As one of the most classic algorithms of big data edge computing, this method has been used as a comparison method in many articles related to big data edge computing.Figure 6
Traditional edge-cloud collaboration model involving edge nodes.As shown in Figure7, the accuracy of most terminals in q-fedsgd is less than the target accuracy. In flbec, only D5 fails to achieve the target accuracy, which indicates that the big data edge computing algorithm can ensure the learning accuracy of the terminal. The difference between the learning accuracy of each terminal and the target accuracy under the three algorithms is shown in the figure, from which we can see the effect of each algorithm in ensuring the learning accuracy. Because CNN can ensure the learning accuracy in big data edge computing, this paper takes 0.99 times of the terminal learning accuracy after running as the target accuracy of each terminal in the big data edge computing algorithm.Figure 7
Employment data training test.As shown in Figure8, from 2016 to 2021, in terms of income, the average monthly pretax income of the formal employment group is 4232 yuan, and the average monthly pretax income of the informal group is 3503 yuan, which is 20.8% less than that of the formal employment group. Through the quantile statistics, we can find that the income of the informal employment group is not more than that of the formal employment group at each quantile point, and the income gap at each quantile point is basically uniform. Mann–Whitney test is used to analyze whether there are significant differences among different groups of employment forms in order to judge whether there is selection bias in the choice of employment forms. This paper uses the propensity score matching method to balance the selection bias in the choice of employment forms, estimates the average processing effect (ATT) on the basis of controlling the selection bias of employment forms, and analyzes whether and to what extent the two employment forms lead to the income difference of university graduates. Based on the decomposition of wage difference in the form of employment, the two economic schools put forward different theoretical views on the wage determination mechanism.Figure 8
Forms of employment selection bias.As shown in Figure9, compared with the CNN model, the edge fog calculation model in this paper has more available analysis indexes as tuples, so the accuracy rate of prediction can reach 83.25%. In this case, the difference between the two models in data processing and prediction efficiency is small. Compared with the LSTM-based classification prediction model, this model is edge computing, which greatly improves the data quality of the model and data parameters, and the calculation efficiency can be increased by 45%–65%. Therefore, the use of big data technology can provide a reference for the research direction of higher education.Figure 9
Different combinations of employment forecast rates.


## 4.2. Discussion

The computing capacity of employment data is precious and limited, so it is particularly important to allocate resources reasonably. Mobile edge computing sinks the function of cloud computing center to edge cloud, making the cloud computing center closer to the resource demand side. In the face of large data throughput scenarios, the use of distributed processing method can effectively reduce the overall transmission delay of the network and improve the processing efficiency of the system. Now, abnormal data processing of employment data has been widely used in many aspects of employment data calculation. This paper explores the abnormal data detection of large-scale employment data. This paper explores how to monitor abnormal data in wireless sensor networks. This paper explores the problem of abnormal data processing in employment data single application and explores the problem of abnormal data processing in local sensor networks. However, a single application scenario data solution may rely on the unique characteristics of the application data, resulting in the fact that the method is not universal. At the same time, the solution of abnormal data in the local network cannot meet the “multidata, multitask” scenario of the employment data scale, so this paper proposes a distributed abnormal filtering algorithm for heterogeneous data of employment data level.Under the influence of mercantilism, the efficiency of the service industry in developed countries was generally higher than that of the manufacturing industry in history, but it was after the establishment of the Ford system that the modern sector got sustainable development. Therefore, the characteristics of industrial structure in contemporary developed countries are as follows: the service industry dominates economic growth and forms the linkage of high-end service industry and industrial efficiency improvement. The high-end service industry is reflected in the rapid development of the modern knowledge-intensive service industry. The development of science, education, culture and health, financial information, and other industries not only endows the service industry with high efficiency but also promotes industrial integration. In contrast, in developing countries in the process of modernization, the higher proportion of service industry mostly comes from traditional industries, which is different from the essence of structural service in developed countries in that the service industry cannot provide sustainable efficiency compensation.


## 5. Conclusions

The role of big data edge computing in predicting the employment rate of colleges and universities in China’s employment market is not uniform, and the discriminatory factors are more obvious in the low-income groups. This may be due to the fact that most of the informal employees of low-income groups are employees who lack security, and the market’s own regulatory mechanism is difficult to play a role in it, which makes it difficult for the informal employees of low-income groups to reach the income level consistent with their own characteristics. In the process of helping college graduates connect with work, universities and recruitment units pay more attention to students whose families are in financial difficulty and lack social resources and respond to them so that they can get them. You should strive to provide employment help and guidance jobs that match the characteristics of your human capital. Government departments should further promote the transparency and standardization of the labor market, especially in the informal employment market, should provide more perfect rights and interests protection mechanism and a more efficient labor market system for low-income groups, and try to reduce the negative impact of discriminatory factors on the income of informal employment college graduates, to provide training and learning opportunities for informal employment groups, help them to further develop their own human capital level and individual competitiveness, so as to enhance the overall level of the informal employment market, balance the value differences between the two employment groups, and make informal employment form play a greater role in promoting society under the condition of the socialist market economy.



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*Source: 1421356-2021-12-21.xml*