Research on the Effectiveness and Promotion Strategy of Overseas Returnees in Colleges and Universities under the Background of “Double First-Class” Construction

This paper selects the literature related to the introduction of university returnees in China Academic Journal Publishing General Library from 2008 to 2022, collects the literature data as two retrieval items, and analyzes the knowledge structure and hot issues of domestic academic circles on the introduction of overseas returnees in colleges and universities by using bibliometric tools such as Citespace and CNKI visualization software. It is found that the establishment of the ternary interactive model of academic ecology of the returned teachers in colleges and universities will improve their work efficiency and relieve their work pressure. Establish IPO model of academic innovation of college returnees teachers, and obtain the influencing factors that promote individual academic innovation and team research innovation output; by analyzing the common relationship between academic ecology and academic innovation, the strategies to improve the effectiveness of overseas returnees in colleges and universities are obtained.

universities have set up an annual salary system with flexibility, strong individuality and high salary level for overseas returnees. On the other hand, they have evaluated the academic ability of overseas returnees by quantitative means, which has led to the overseas returnees' pursuit of scientific research results changing from quality to quantity. In order to pass the evaluation of high-paying contracts, some returnees in colleges and universities do not hesitate to plagiarize and copy other people's academic achievements in violation of academic ethics and norms, resulting in a large amount of academic rubbish, which makes the total number of SCI papers in China rank among the top in the world, but the single citation level of papers is not high.
In today's world-class universities and the construction of first-class disciplines, colleges and universities have invested a lot of money to introduce overseas returnees. How to complete the transformation from "salary" to "heart" to establish and improve a good academic ecology for overseas returnees teachers in colleges and universities based on scientific research integrity? Secondly, a good academic ecology is the cornerstone of academic development. If a good academic ecological circle is formed, the returned teachers in colleges and universities can become the source and inexhaustible motive force of academic innovation and development. At the same time, the original scientific research achievements and academic background of overseas returnees in colleges and universities bring positive spillover effects to academic innovation of university teachers' team (Yu & Fan, 2017). What factors can affect academic innovation of individual and team returnees in colleges and universities? Therefore, this paper makes an in-depth discussion on the effectiveness of overseas returnees in colleges and universities under the background of "doubleclass" construction. The research results will enhance the effectiveness of overseas returnees in colleges and universities, help colleges and universities to establish a good academic ecosystem, and promote the academic achievement innovation and team innovation ability of overseas returnees teachers in colleges and universities, which has profound practical significance.

Data
In order to deeply analyze the knowledge structure and hot issues related to the introduction of overseas returnees in colleges and universities, this paper selects overseas returnees and talent introduction in colleges and universities as two retrieval items to collect the literature data. The literature data samples are from CNKI General Library of China Academic Journals, and the data are analyzed by literature metrology tools such as Citespace and CNKI visualization software.
In this paper, all the documents collected in China Academic Journal Publishing General Library are selected, and repeated word truncation is used. First, the keyword "theme = returnees from colleges and universities" is used to search the documents and materials of all ages, and it is found that 419 retrieval results are obtained. In order to focus on the research data accurately, 89 retrieval re-

1) Quantity and time analysis of documents issued
As shown in Figure  As can be seen from Figure 1, the number of published papers is on the rise as a whole, and the number of published papers is small from 2008 to 2016. This paper mainly analyzes two major themes: the introduction policy and the introduction risk of overseas returnees in colleges and universities. During the period of 2017-2019, references and citations continued to rise. This paper discussed in depth the effectiveness evaluation, incentive mechanism, differences between returnees and local talents, and satisfaction evaluation of talent introduction.
After 2020, the number of papers published dropped from the peak to the trough, but the number of cited documents gradually reached the peak, indicating that most scholars' research angles and data sources have changed, for example, paying attention to the research on the demand analysis, talent introduction mode, talent introduction effect investigation and talent introduction countermeasures of college returnees, which indicates that the research on talent introduction of college returnees has gradually become a hot topic of discussion.

2) Keyword analysis
The core ideas of each academic paper are expressed by keywords, which cover the important content of the theme of the paper. Therefore, the analysis of keywords in related literature in a certain field can quickly dig out the research ideas and contents in this field. In this paper, the time span is set from 2008 to 2022 by importing all literature data into the software. The length of a single time partition is 1a; Select the source of cluster words as title, abstract, author keywords and supplementary keywords plus. The cluster type is selected as Burst Plus; the node type is keywords.
Since there are 47 documents and data, the software extracts the highest value of the cited word frequency in each time zone and adjusts it to 25 keywords.
Click the analyze button, and after cluster analysis by Citespace software, the keyword map is shown in Figure 2. The reliability (Q value) of data analysis in (海归人才: Returned talents, 高校人才引进: Talent introduction in colleges and universities, 文化适应: Cultural adaptation, 海归教师: Returned teachers, 留学人员: Overseas students).  3) Review of studies The above-mentioned two research hotspots of overseas returnees in colleges and universities are obtained through bibliometric software. In order to give full play to the effectiveness of overseas returnees in colleges and universities, on the one hand, some scholars have conducted in-depth research from the perspectives of the implementation effect evaluation of overseas returnees in colleges and universities (Guo & Lu, 2019) and the analysis of high-level talents in colleges and universities (Guo & Wang, 2017), and think that the introduction measures of overseas returnees in colleges and universities tend to quantify personal performance too much.
On the other hand, from the perspective of academic ecology, scholars discussed the optimization path of academic ecological environment in colleges and universities (Xiang, 2014), the academic ecological smog and its governance (Li, 2016), and the ecological logic of academic governance in colleges and universities (Wang & Song, 2018), and put forward some academic ecological governance methods such as improving the evaluation standards of scientific research and strengthening academic moral cultivation.
However, there are few domestic scholars' researches on the academic innovation of individual and team returnees in colleges and universities, mainly focusing on the influencing factors of the development of returnees in colleges and universities (Ding, 2022) and the job satisfaction of returnees in colleges and universities during their first employment period (Li & Zhu, 2020).

Theoretical Analysis Framework of the Effect of Overseas Returnees in Colleges and Universities
According to the spirit of relevant national documents, in order to solve the problem of "one size fits all" in the introduction of returnees in colleges and universities. Colleges and universities should give full play to the high-quality resources of returnees, intensify the introduction of returnees, establish an effectiveness system for the introduction of returnees oriented by innovation ability, quality and contribution, and complete the transformation from "salary" to "heart" to let them quickly adapt to the domestic academic environment and urge them to do scientific research honestly and practically.   (Li, 2016), uses Bandura's ternary interaction theory model to deeply analyze the relationship among returned college teachers, academic behavior and academic environment, explore which academic environment factors can influence and restrict each other, and establish and improve a good academic ecosystem of returned college teachers based on scientific research integrity.
As for the academic innovation research of college returnees, the academic mode of single-handedly fighting in colleges and universities has been replaced by the team research mode (Pan, 2016), and the good academic ecosystem of college returnees will guide them to improve their academic innovation ability and that of the team. In this paper, McGrath's theoretical model of team effectiveness is used to deeply analyze the input, process and output of university returnees' team research innovation, the interactive process of university returnees' team knowledge sharing, and the problems of how university returnees' personal innovation can affect the team teachers' innovation ability.
As for the research on the promotion strategy of overseas returnees in colleges and universities, based on the research conclusions of academic ecology of overseas returnees in colleges and universities and academic innovation of overseas returnees in colleges and universities, this paper will get the similarities of the research conclusions of both, and put forward the improvement strategies.

2) Research on Academic Ecology of Returned Teachers in Colleges and
Universities Ecology refers to the academic system which is interrelated, influenced and restricted by academic subjects, academic objects and academic environment (Li, 2016). In this paper, overseas teachers (OT) are selected as academic subjects, academic behavior (AB) as academic objects, and academic environment (AE).
By using Bandura's ternary interaction theory model, a ternary interaction model of academic ecology of overseas teachers in colleges and universities is constructed, as shown in Figure 4.
In order to measure the reciprocal relationship among the three elements, the Positive work pressure may reduce the academic behavior effect (such as difficulty in issuing papers), and inefficient academic behavior will close down and improve the academic environment. In a word, this paper deeply discusses which academic environment factors will promote efficient academic behavior (such as original papers and practical results), improve the work efficiency of college returnees teachers, relieve their work pressure, and finally form a good academic ecosystem.

3) Research on Academic Innovation of Returned Teachers in Colleges and Universities
Scientific research in colleges and universities can no longer produce outstanding results alone. Only scientific research teams can produce first-class scientific research results. Returned teachers in colleges and universities will improve their academic innovation ability and that of their teams through scientific research teams. In this paper, McGrath's theoretical model of team effectiveness is used to construct an "input-process-output" (IPO) IPO model of academic innovation of college returnees teachers, as shown in Figure 5.
In the model, Input refers to the causal relationship between individual innovation factors (Luo et al., 2017), team factors (Yu & Fan, 2017), environmental factors (Liu, 2010) and the corresponding secondary index variables (return

Promotion Strategies for the Introduction of Returned Talents in Colleges and Universities
Firstly, this paper deeply analyzes the relationship between the academic ecology of college returnees and their academic innovation. Based on their research conclusions, we get their common factors, and get some key factors to improve the effectiveness of the introduction of college returnees, as shown in Figure 6. Secondly, in view of the shortcomings of the existing overseas talent introduction in colleges and universities, combined with common factors, this paper puts forward several strategies to promote the effectiveness of overseas talent introduction in colleges and universities, and makes contributions to the construction of "double-first-class" universities and disciplines and the construction of university think tanks in China.

Summary
In recent years, in order to build world-class universities and first-class disciplines, major universities have continuously invested a large amount of money to introduce overseas returnees. How to complete the transformation from "salary" to "heart", establish and improve a good academic ecology for overseas returnees teachers in universities based on scientific research integrity? At the same time, how can the original scientific research achievements and academic background