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Reaction-diffusion modeling of malware propagation in mobile wireless sensor networks

Science China(Information Sciences) 2013年第9期56卷 257-274页

作者： WANG XiaoMing HE ZaoBo zhao xueqing LIN Chuang PAN Yi CAI ZhiPeng School of Computer Science Shaanxi Normal University Department of Computer Science and Technology Tsinghua University Department of Computer Science Georgia State University

Mobile Wireless Sensor Networks (MWSNs) are employed in many fields, such as intelligent transportation, community health monitoring, and animal behavior monitoring. However, MWSNs may be vulnerable to malicious interference because of the large-scale characteristics. One of the threats is to inject malware into some nodes, especially mobile nodes. When a contaminated node communicates with its neighbors, multiple copies of the malware are transmitted to its neighbors, which may destroy nodes, block regular communications, or even damage the integrity of regular data packets. This work develops a modeling framework which mathematically characterizes the process of malware propagation in MWSNs based on the theory of reaction-diffusion equation. Our proposed model can efficiently predict the temporal dynamic behavior and spatial distribution of malware propagation over time, so that targeted immunization measures can be taken on infected nodes, whereas most of the existing models for malware propagation can only predict the temporal dynamic behavior rather than the spatial distribution of malware propagation over time. We conduct extensive simulations on large-scale MWSNs to evaluate the proposed model. The simulation results indicate that the proposed model and method are efficient, and that the mobile speed, communication range, and packet transmission rate of nodes are the main factors affecting malware propagation in MWSNs.

关键词： mobile wireless sensor network malware propagation reaction-diffusion equation equilibrium point stability spatial distribution targeted immunization strategy

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Research on the Prevention and Control Methods for Forest Disasters in China's Forestry Ecological Environment Construction

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Agricultural Biotechnology 2022年第4期11卷 148-160页

作者： Yanrong CAI xueqing zhao Qiuyu LAI Sichuan Water Resources and Hydroelectric Investigation and Design Research Institute Co. Ltd.Chengdu 610072China China State Grid Sichuan Electric Power Company Construction Branch Chengdu 610072China

With the development of economy,China has gradually begun to pay attention to the protection of the natural *** the concept of"lucid waters and lush mountains are invaluable assets",importance has been attached to the development of forestry *** protection of forest resources and the prevention and control of disasters are important contents and necessary components in the construction of China's forestry ecological *** the analysis and research on the types of forest disasters(forest fires,biological disasters,meteorological disasters,geological disasters,deforestation)and disaster-causing factors,some basic countermeasures were put forward with the aim to enhance the production capacity of forest resources,improve the ecological environment of forest resources and prevent forest resource disasters.

关键词： Lucid waters and lush mountains Invaluable assets Forest disasters Disaster prevention and mitigation Basic countermeasures

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A Modified T/2 Fractionally Spaced Coordinate Transformation Blind Equalization Algorithm

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International Journal of Communications, Network and System Sciences 2010年第2期3卷 183-189页

作者： Yecai GUO xueqing zhao Zhenxin LIU Min GAO 不详

When T/2 Fractionally Spaced blind Equalization Algorithm based Constant Modulus Algorithm (T/2-FSE- CMA) is employed for equalizing higher order Quadrature Amplitude Modulation signals (QAM), it has disadvantages of low convergence speed and large Mean Square Error (MSE). For overcoming these disadvantages, a Modified T/2 Fractionally Spaced blind Equalization algorithm based on Coordinate Transformation and CMA (T/2-FSE-MCTCMA) was proposed by analyzing the character of 16QAM signal constellations. In the proposed algorithm, real and imaginary parts of input signal of T/2 fractionally spaced blind equalizer are equalized, respectively, and output signals of equalizer are transformed to the same unit circle by coordinate transformation method, a new error function is defined after making coordinate transformation and used to adjust weight vector of T/2 fractionally spaced blind equalizer. The proposed algorithm can overcome large misjudgments of T/2 fractionally spaced blind equalization algorithm for equalizing multi-modulus higher order QAM. Simulation results with underwater acoustic channel models demonstrate that the proposed T/2-FSE-MCTCMA algorithm outperforms T/2 Fractionally Spaced blind Equalization algorithm bas-ed on Coordinate Transformation and CMA (T/2-FSE-CTCMA) and the T/2-FSE-CMA in convergence rate and MSE.

关键词： Blind Equalization Underwater Acoustic Channel Coordinate-Transformation Fractionally Spaced Equalizer

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Non-sampling errors in questionnaire surveys: findings from a National Fertility Survey

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China Population and Development Studies 2022年第1期6卷 34-54页

作者： Jianan Qi xueqing zhao Yaer Zhuang Bohua Li China Population and Development Center BeijingChina China Population Association BeijingChina

Non-sampling errors can generally be divided into three types:sampling frame errors,non-response errors and measurement *** target units in the sam-pling frame,improper handling of non-responses,and misreporting or underreport-ing of key variables in the questionnaire can all cause deviations in a survey’s *** widespread application of Computer-Assisted Personal Interviewing(CAPI)systems and the inclusion of administrative records from government sources in sur-veys has strengthened the ability to control non-sampling *** a national fertility sampling survey as an example,this study summarizes the sources of var-ious non-sampling errors and explains how to harness big data resources such as administrative records to control non-sampling errors throughout the *** study analyzes the impact of three types of non-sampling errors on the results of the fertility survey and examines the strategies used to address the problems caused by these non-sampling *** findings indicate that non-sampling errors were the main source of total error in the survey,and that the errors found came mainly from sampling frame errors;non-response errors and measurement errors were controlled and had little impact on the survey results.

关键词： Non-sampling error Sampling frame error Administrative records Fertility survey

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Evolution of Financial Risks in Emerging Markets under the Background of an Interest Rate Hike in the US

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China Economic Transition 2019年第1期2卷 36-51页

作者： CHEN Weidong ZHONG Hong WANG Youxin zhao xueqing of Institute of International Finance Bank of China

In 2018,advanced economies saw continuous recovery and a tightening of monetary policy;however,emerging markets were in for a more challenging *** April 2018,financial turmoil in emerging markets has been exacerbated by a faster-than-expected increase in the USD index,a surge for 10-year *** yields.A financial crisis broke out first in Argentina,followed by emerging economies like Turkey,Brazil,and Indonesia,substantially exacerbating their financial *** is the commonality between the current round of financial turmoil in emerging markets and historically financial crisis?

关键词： Financial faster policy

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Resistance of Diamondback Moth Population against Eight Kinds of Insecticides in Luliang County of Yunnan Province

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Plant Diseases and Pests 2014年第1期5卷 28-31页

作者： Yin Yanqiong Li Xiangyong zhao xueqing Zhu Jianliang Shen Aidong Institute of Agricultural Environment Resources Yunnan Academy of Agricultural Sciences Luliang Plant Protection and Quarantine Station

Resistance of diamondback moth （ Plutella xylostella L. ） population against eight kinds of insecticides in Luliang County of Yunnan Province in China was determined in laboratory by leaf dipping method in autumn of 2009 and spring of 2010. The monitoring results showed that diamondback moth population in Lu- liang County of Yunnan Province had produced extremely high resistance against beta-cypermethrin and avermectin; LC50 in autumn of 2009 were 1 035.21 and 1 055.19 mg/L, while those in spring of 2010 were 9.55 and 13.84 mg/L, respectively; the resistance ratios were from 291.61 to 692.00. The diamondback moth population had moderately high resistance to spinosad, indoxacarb and chlorfluazuron; LC50, in autumn of 2009 were 1.59, 2.80 and 23.97 mg/L, while those in spring of 2010 were 13.83,24.57 and 42.73 mg/L, respectively; the resistance ratios were froml3.25 to 129.98. The diamondback moth population was sensitive to diafenthiuron, BT and chlorfenapyr; LC50 in autumn of 2009 were 16.51, 47.40 and 0.85 mg/L, while those in spring of 2010 were 1.34, 3.38 and 1.60 mg/L, respectively; the resistance ratios were from 0. 77 to 8.45. The resistance of diamondback moth population in Luliang County of Yunnan Province against eight kinds of insecticides successively were diafenthiuron 〈 BT preparations 〈 chlorfenapyr 〈 spinosad 〈 indoxacarb 〈 chlorfluazuron 〈 beta-cypermethrin 〈 ave rmectin, and the resistance in spring was higher than that in autumn.

关键词： Diamondback moth Resistance Application strategy

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《资本论》续篇逻辑结构和主要结论的假说——马克思主义研究的构建视角

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河南社会科学 2010年第3期18卷 34-39页

作者：赵学清解放军南京政治学院江苏南京210003

《国家》、《对外贸易》和《世界市场》是马克思计划撰写的经济学巨著的后三册,是《资本论》的续篇。在马克思著作中钩玄,并根据《资本论》的叙述方法,可以在推导《国家》、《对外贸易》、《世界市场》各册逻辑结构的基础上对其主要结... 详细信息

《国家》、《对外贸易》和《世界市场》是马克思计划撰写的经济学巨著的后三册,是《资本论》的续篇。在马克思著作中钩玄,并根据《资本论》的叙述方法,可以在推导《国家》、《对外贸易》、《世界市场》各册逻辑结构的基础上对其主要结论作如下假说:夺取资产阶级国家政权是无产阶级推翻资本主义生产方式的第一个行动(《国家》册);对外贸易把资本主义生产的基本矛盾从一国扩展到他国(《对外贸易》册);全世界无产者联合起来,在一切文明国家同时革命并取得胜利才能消灭资本主义(《世界市场》册)。深入研究《资本论》续篇的逻辑结构和主要结论有助于我们正确理解什么是马克思主义、怎样对待马克思主义。

关键词：《资本论》续篇逻辑结构主要结论假说

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连续分振幅式高功率准分子激光角多路编码光路设计

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红外与激光工程 2016年第6期45卷 21-25页

作者：胡云王大辉赵学庆西北核技术研究所激光与物质相互作用国家重点实验室陕西西安710024 中国工程物理研究院激光聚变中心四川绵阳621900

在高功率准分子激光系统中,一般采用光学角多路技术来获得高能量窄脉冲输出。文中介绍了角多路技术原理,提出了一种采用矩形阵列和空间层叠光路结构的连续分振幅两次编码方式,并针对该实验室的XeCl高功率准分子激光系统进行了具体的编... 详细信息

在高功率准分子激光系统中,一般采用光学角多路技术来获得高能量窄脉冲输出。文中介绍了角多路技术原理,提出了一种采用矩形阵列和空间层叠光路结构的连续分振幅两次编码方式,并针对该实验室的XeCl高功率准分子激光系统进行了具体的编码光路设计,给出了设计实例。该方法具有编码结构紧凑,编码精度高,与光路准直、激光参数测量系统等兼容性好,便于加工制作和安装调节等优点,目前已在系统中应用,效果良好。

关键词：激光光学准分子激光角多路技术编码

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多路脉冲激光参数分时法在线测试技术研究

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中国激光 2015年第10期42卷 27-31页

作者：胡云王大辉赵学庆西北核技术研究所激光与物质相互作用国家重点实验室陕西西安710024 中国工程物理研究院激光聚变研究中心四川绵阳621900

在高功率准分子系统中,为实现窄脉宽激光放大和满足辐照均匀性的要求,采用了光学角多路技术,系统光束数量多、传输环节多,具有很高的光学复杂性。为保证系统高效稳定运行,需要实时监测和评价各个环节的工作状态,即对"平台"中每一放大级... 详细信息

在高功率准分子系统中,为实现窄脉宽激光放大和满足辐照均匀性的要求,采用了光学角多路技术,系统光束数量多、传输环节多,具有很高的光学复杂性。为保证系统高效稳定运行,需要实时监测和评价各个环节的工作状态,即对"平台"中每一放大级和众多光束的激光参数进行在线诊断和测量。为此,针对高功率准分子激光系统的特点,提出了一种分时测量技术,并进行了原理性实验研究。该技术可采用一套测试元件实现多路激光能量和波形参数的在线测量,优点是不仅可以提高测试效率,可降低测试系统的复杂度和造价,而且可避免由不同测量元件带来的系统误差。

关键词：激光器高功率激光准分子角多路技术参数测量

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China fertility survey 2017:design and implementation

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China Population and Development Studies 2019年第1期2卷 259-271页

作者： Yaer Zhuang Shenghui Yang Jianan Qi Bohua Li xueqing zhao Zhili Wang China Population and Development Research Center BeijingChina Renmin University of China BeijingChina

This paper examines the design and the process used to carry out the China Fertility Survey 2017,a national representative survey that collected data on fertility desire,childbearing behavior,the use of childbearing services,and the determinants of childbearing *** sampling method adopted was three-stage stratified probabilities proportional to size(PPS),and survey implementation made use of Computer Assisted Personal Interviewing(CAPI).CAPI played a significant role in survey design,last-stage sampling,interviewer training,face-to-face interviews,and questionnaire review and quality *** survey results were compared with relevant data in the Integrated Management Information System for Population and Family Planning to check *** post facto weighting was applied to correct sample structure *** process used to acquire accurate personal information is *** based on consideration of sampling frame distortion by population mobility and other factors are put forward in the hope of improving similar sampling surveys in the future.

关键词： Fertility survey Quality control Ex post facto weighting

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