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By analyzing the historical network security situation awareness data, NSSA can evaluate the network security threat and analyze the network attack stage, thus fully grasping the overall network security situation. With the rapid development of 5G, cloud computing, and Internet of things, the network environment is increasingly complex, resulting in diversity and randomness of network threats, which directly determine the accuracy and the universality of NSSA methods. Meanwhile, the indicator data is characterized by large scale and heterogeneity, which seriously affect the efficiency of the NSSA methods. In this paper, we design a new NSSA method based on the autoencoder (AE) and parsimonious memory unit (PMU). In our novel method, we first utilize an AE\u2010based data dimensionality reduction method to process the original indicator data, thus effectively removing the redundant part of the indicator data. Subsequently, we adopt a PMU deep neural network to achieve accurate and efficient NSSA. The experimental results demonstrate that the accuracy and efficiency of our novel method are both greatly improved.<\/jats:p>","DOI":"10.1155\/2021\/1173065","type":"journal-article","created":{"date-parts":[[2021,9,14]],"date-time":"2021-09-14T03:20:36Z","timestamp":1631589636000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["An Efficient Network Security Situation Assessment Method Based on AE and PMU"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6573-2291","authenticated-orcid":false,"given":"Xiao-ling","family":"Tao","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6796-650X","authenticated-orcid":false,"given":"Zi-yi","family":"Liu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3391-3151","authenticated-orcid":false,"given":"Chang-song","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,9,13]]},"reference":[{"key":"e_1_2_9_1_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-662-46578-3_48"},{"key":"e_1_2_9_2_2","doi-asserted-by":"publisher","DOI":"10.1186\/s13638-018-1309-9"},{"key":"e_1_2_9_3_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00485316"},{"volume-title":"Machine Learning","year":"1997","author":"Mitchell T. 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