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Stability of Nonlinear Feedback Shift Registers with Periodic Input 被引量:2
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作者 Bo Gao Xuan liu +5 位作者 Xiaobo Wu shudong li Zhongzhou Lan Hui Lu Boyan liu 《Computers, Materials & Continua》 SCIE EI 2020年第2期833-847,共15页
The stability of Non-Linear Feedback Shift Registers(NFSRs)plays an important role in the cryptographic security.Due to the complexity of nonlinear systems and the lack of efficient algebraic tools,the theorems relate... The stability of Non-Linear Feedback Shift Registers(NFSRs)plays an important role in the cryptographic security.Due to the complexity of nonlinear systems and the lack of efficient algebraic tools,the theorems related to the stability of NFSRs are still not well-developed.In this paper,we view the NFSR with periodic inputs as a Boolean control network.Based on the mathematical tool of semi-tensor product(STP),the Boolean network can be mapped into an algebraic form.Through these basic theories,we analyze the state space of non-autonomous NFSRs,and discuss the stability of an NFSR with periodic inputs of limited length or unlimited length.The simulation results are provided to prove the efficiency of the model.Based on these works,we can provide a method to analyze the stability of the NFSR with periodic input,including limited length and unlimited length.By this,we can efficiently reduce the computational complexity,and its efficiency is demonstrated by applying the theorem in simulations dealing with the stability of a non-autonomous NFSR. 展开更多
关键词 Non-Linear Feedback Shift Register(NFSR) Boolean Network(BN) Semi-Tensor Product(STP) transition matrix STABILITY periodic input
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Is EGFR gene mutation testing necessary in smokers with non-small cell lung cancer? 被引量:1
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作者 Jianfei Zhu Jinyan Yuan +4 位作者 Yawei Dou Wei Tian shudong li Hongtao Wang Zhe li 《Oncology and Translational Medicine》 2017年第4期156-159,共4页
Objective Previous studies have proven that cumulative smoking dose predicts the prevalence of epidermal growth factor receptor(EGFR) mutations. The aim of this study was to investigate the relationship between smokin... Objective Previous studies have proven that cumulative smoking dose predicts the prevalence of epidermal growth factor receptor(EGFR) mutations. The aim of this study was to investigate the relationship between smoking-related factors and EGFR mutation status. Methods Samples were collected from 195 smokers with non-small cell lung cancer(NSCLC) who underwent surgical resection and the presence of EGFR mutations(exons 19 and 21) were determined by real-time polymerase chain reaction(RT-PCR).Results EGFR gene mutations were present in 33(16.9%) patients who were smokers; the patients were divided into three groups according to the smoking index(SI). The incidence of EGFR mutations decreased from 38.9% in mild smokers to 8.1% in severe smokers(P = 0.001). Compared to daily smoking dose(P = 0.547), initial smoking age(P = 0.085) and duration of smoking history had a larger effect on EGFR mutation status(P = 0.002).Conclusion Although there is a decrease in the incidence of mutations with increasing SI, there were still around 17% of smokers with NSCLC that harbored EGFR mutations, so it is necessary to test for EGFR mutation status in smokers with NSCLC. 展开更多
关键词 EPIDERMAL growth factor receptor (EGFR) MUTATION SMOKING NON-SMALL cell LUNG cancer (NSCLC)
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Recommender System Combining Popularity and Novelty Based on One-Mode Projection of Weighted Bipartite Network
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作者 Yong Yu Yongjun Luo +4 位作者 Tong li shudong li Xiaobo Wu Jinzhuo liu Yu Jiang 《Computers, Materials & Continua》 SCIE EI 2020年第4期489-507,共19页
Personalized recommendation algorithms,which are effective means to solve information overload,are popular topics in current research.In this paper,a recommender system combining popularity and novelty(RSCPN)based on ... Personalized recommendation algorithms,which are effective means to solve information overload,are popular topics in current research.In this paper,a recommender system combining popularity and novelty(RSCPN)based on one-mode projection of weighted bipartite network is proposed.The edge between a user and item is weighted with the item’s rating,and we consider the difference in the ratings of different users for an item to obtain a reasonable method of measuring the similarity between users.RSCPN can be used in the same model for popularity and novelty recommendation by setting different parameter values and analyzing how a change in parameters affects the popularity and novelty of the recommender system.We verify and compare the accuracy,diversity and novelty of the proposed model with those of other models,and results show that RSCPN is feasible. 展开更多
关键词 Personalized recommendation one-mode projection weighted bipartite network novelty recommendation diversity
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表面展示新城疫病毒部分F蛋白的重组干酪乳杆菌的构建及其免疫原性 被引量:4
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作者 刘欢欢 李树东 +8 位作者 杨雨晴 孙晓莹 李岩 刘昕旸 陈小燕 张连妹 白永飞 侯喜林 余丽芸 《生物工程学报》 CAS CSCD 北大核心 2019年第8期1453-1462,共10页
本研究旨在构建重组干酪乳杆菌pLA-Newcastle disease virus (NDV)-F/Lactobacillus casei,获得表达产物,并探讨其免疫效果。利用PCR扩增携带部分主要抗原表位的NDV F基因,与穿梭质粒pLA连接转化至大肠杆菌BL21 (DE3)中,筛选阳性重组质... 本研究旨在构建重组干酪乳杆菌pLA-Newcastle disease virus (NDV)-F/Lactobacillus casei,获得表达产物,并探讨其免疫效果。利用PCR扩增携带部分主要抗原表位的NDV F基因,与穿梭质粒pLA连接转化至大肠杆菌BL21 (DE3)中,筛选阳性重组质粒,将其电转化至干酪乳杆菌中,构建重组干酪乳杆菌pLA-NDV-F/L. casei,应用PCR鉴定阳性菌株,Western blotting鉴定重组菌反应原性,间接免疫荧光、流式细胞术和激光共聚焦检测蛋白表达情况。试验选用14日龄雏鸡,各组免疫方式为口服+滴鼻。设立pLA-NDV-F/L. casei两次免疫组和三次免疫组、弱毒疫苗组、pLA/L.casei、未攻毒PBS组和攻毒PBS组。间接ELISA方法检测雏鸡血清IgG、肠道、鼻腔、肺脏中sIgA抗体效价,评价试验组雏鸡攻毒保护率。结果表明,有94.10%的重组菌表达了F蛋白,且高效表达在干酪乳杆菌细胞表面,蛋白大小为62 kDa,并能与抗NDV阳性血清特异性结合。各免疫组anti-F IgG和sIgA抗体水平显著高于对照组,pLA-NDV-F/L. casei三次免疫组抗体持续时间比两次免疫组延长28 d,抗体峰值没有显著差异。免疫pLA-NDV-F/L. casei三次、两次、弱毒疫苗、pLA/L. casei和PBS的攻击保护率分别为80%、80%、90%、0%和0%。因此,利用干酪乳杆菌表达体系成功表达了携带部分抗原表位的NDV F基因,具备良好的反应原性和免疫原性,可诱导机体产生保护性免疫应答。 展开更多
关键词 新城疫病毒 免疫原性 干酪乳杆菌 黏膜免疫 保护率
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