针对缺乏中国域名电子邮箱安全检测研究的问题,设计了一种基于多因素电子邮箱安全性检测模型.首先,基于数据采集和域名筛选模块提取真实有效的不同类别域名数据;其次,基于多因素漏洞检测和数据分析模块检测SPF、DMARC、STARTTLS等电子邮箱安全扩展协议的实施情况.实验获取了18140个政府机构域名和2766个教育机构域名,其中 25.5%的教育机构和4.50%的政府机构域名发布了有效SPF记录;仅7个教育机构和2个政府机构域名发布了有效DMARC记录;46.8%的教育机构和10.4%的政府机构域名支持STARTTLS扩展.

The existing methods for detecting bearing faults based on chaotic oscillators have been suc-cessfully applied.The key step of the method is to distinguish the phase transition of chaotic oscilla-tors.Lyapunov exponents are usually used to judge the transformation,w hich is complicated and time-consuming.Starting with image recognition,an identification method based on polar radius in-variant moment parameter for phase transformation was proposed.The Duffing chaotic oscillator was constructed,and the relationship between the phase transition and the cyclic dynamic force was ana-lyzed,and the feasibility of the early fault identification for the bearing by chaotic oscillators was proved.Then,the definition of polar radius invariant moment was given,and it was proved that the value of performance was monotonically increasing in the process of chaotic oscillator phase transition from chaos to large-scale periodic state with the periodic perturbation increasing.The anti noise capa-bility of polar radius invariant moments was discussed and compared with the HU's invariant moments and the two-dimensional approximate entropy method.Finally,the method was applied to the test of the early fault diagnosis in the power head bearing of drilling machine.The experimental results show that the polar radius invariant moment could identify the phase transition of chaotic oscillator,and the minimum detection signal-to-noise ratio was -36.99 dB,and the accuracy of recognition was im-proved by 4% -7% comparing with the other two methods.The method proposed can be used in early identification of bearing faults and has the advantages of high recognition accuracy,strong noise im-munity and simple calculation.

为适应声发射信号频率覆盖范围广且频率高的特点,该文使用在S变换的基础优化而来的广义S变换,通过对广义S变换的时频分辨率特性进行分析,选取广义S变换的参数λ=2 210,p=0.151,使得其在20~1 000kHz的频率范围内依然拥有1~2kHz的频率分辨率;随后在广义S变换分析的基础上对机械密封端面的声发射信号进行滤波和特征提取,并使用GA优化的TWSVM对密封的磨损状况进行识别,准确率达到100%,高于GA-SVM的识别率;说明相比传统的SVM在TWSVM在模式识别上更具有优越性。

针对当前Windows x64版本的内核保护技术,提出一种基于硬件虚拟化的内核Rootkit技术,该技术利用Intel VT-x硬件虚拟化技术将客户系统(Guest OS)迁移到VMM之上运行实现Rootkit.借鉴Shadow Walker内存隐藏思想,基于扩展页表技术对客户系统的不同内存操作映射不同的物理内存,实现隐藏Rootkit代码,对内核保护研究有一定的启发意义.实验证明该技术稳定性强,能够绕过内核保护机制实现内核Rootkit.

This paper researches the V2G-based energy storage capacity configuration of emergency power supply( EPS),and the ESP demand in the area to be restored. Considering socially related influence of power grid,the urban power grid EPS optimization scheme is proposed based on EPS functions. First,determine the composite indicator weight coefficient according to the priority of restoring region; second,on the premise that the normal work of the electric vehicle is guaranteed the next day( including time constraints,capacity constraints,etc.),take the minimum network total cost as objective function and use triangular fuzzy numbers to characterize the uncertainty of EPS logistic time and solve the optimal EV path; finally,formulate the optimal EPS scheme through genetic algorithm. The calculation example analysis verifies the rationality and effectiveness of the proposed model.

The cascading failure of power grid condition can cause serious accidents including large-scale power cut.The small-world network is an important net model of complex net theories.In this paper,based on the small-world network construction,reasonable construction of topology model was put forward to establish the method of forecasting chain fault priority.Secondly,the weighted electrical betweenness was constructed based on the factors of physical properties,electrical parameters,power loss,etc.By combining with complete branch static energy function model,an energy index was built to map the change of flow.Again,the comprehensive margin index of predicting the cascading failures was proposed to reflect the state and structure change of the small-world network model after the power grid failure.Finally,the algorithm was applied in IEEE-57 bus system for example analysis.The simulation results showed that the proposed prediction method can quickly and accurately search out more serious chain failure mode set,which verified the rationality and effectiveness of this method.

This paper introduces a data acquisition system for continuous angle measurement based on double conductive plastic sensor, and its angular resolution is up to 0.1°in theory.The system is mainly composed of a low power MCU, 0 -power consumption serial circuit and display part.Single chips control the inner ADC12 module for data acquisition, then enter into low-power sleep state and can be awakened by timer interruption.By the dual-channel data acquisition with doub-le conductive plastic sensor and the algorithm design, the large size, heavy weight and high demand of dustproof and elec-tromagnetic environment of traditional photoelectric encoder are avoided, and 0 °~360 °continuous angle measurement is realized, which could not be done by the traditional conductive plastic sensor.This system has the characteristics of high accuracy, low power consumption, small size and strong extensibility, which has important application value in angular dis-placement measurement for industrial control, intelligent robots and condition monitoring.

Jia Pingwa pays much attention to the language of the novel.To show the musicality of the language in The Accent of Qin,he uses many techniques,including the frequent use of reduplication and onomatopoeia,the deliberate repetition of implied diction,the wide use of the insertion of long sentences into short verse,and the direct quotation of the contents and numbered musical notations of Shaanxi Opera.Such techniques contribute to flowing rhythm and profound artistic appeal and render the language of The Accent of Qin as musical as the tune of Shaanxi Opera.

ObjectiveTo investigate the possibilities and suitable methods of wear stereotactic frame for rhesus monkeys to establish a traumatic optic rhesus model by gamma knife.Methods11 rhesus monkeys were installed with stereotactic frame Leksell coordinate frame model G after general anesthesia.Among the 11 cases installed with stereotactic frame Leksell coordinate frame model G,the slotted front piece base ring,double insulated fixation posts,short posterior post branch,were divided into: 1 group with fixation posts,anterior anterior branch and 2 group with insulated curved posts kit anterior branches.The operation speed and frame stability were analyzed to find the best method and the suitable frame for rhesus.Results1 failed in 1 group,and the group taken more time.All succeed in 2 group with less time.ConclusionChoice stereotactic frame Leksell coordinate frame model G,the slotted front piece base ring,double insulated fixation posts,short posterior post branch,insulated curved posts kit anterior branches made establish a traumatic optic rhesus model by gamma knife treatment easily and successfully.

A numerical model of heat transfer characteristics of buried tube heat exchanger is built,based on line heat source theory.Through the model,the borehole wall temperature is simulated with different operational modes in summer.The operation results of temperature and humidity independent control hybrid ground source heat pump system are analyzed.The hybrid ground source heat pump system can reduce the ground pipe wall temperature effectively,thereby enhancing the efficiency of ground source heat pump.The mentioned data can be the references for design and operation modes of the ground source heat pump system.

For heat accumulation in underground temperature field caused by the ground source heat pump system being in long-term operation in hot summer and warm winter zone,puts forward the solution that the ground source heat pump system is operated alternately under cooling,shut-down and heating conditions.Using the limited long-term heat source,and superposition principle,studies the underground temperature field around U-tube heat exchanger on different drilling depth,distance from the drilling center and operation strategies.The result has practical value for guiding engineering application of the ground source heat pump system.

受全球金融危机影响,中小企业资金管理问题尤为突出,主要表现为融资难、经营成本高、企业抗风险能力减弱,资金运营、财务管理等方面问题。完善金融体系、引导民间融资,加强企业信用、产业转移等是解决中小企业资金管理问题的必然对策。

<正>随着现代医学模式由生物医学模式向生物心理社会医学模式的转变~[1],护理工作也由以疾病为中心的护理转变为以患者为中心的整体护理和以人的健康为中心的护理~[1]。这要求为患者提供一个安静、

创意产业人才对我国创意产业的发展起了极其重要的作用,但我国创意产业人才却长期存在缺口,因此探索创意产业人才胜任力模型具有十分重要的理论意义和现实意义。文章界定了创意产业人才的定义,并以动漫、广告业为例,根据相关文献总结出创意产业人才的素质要求,建立了动漫、广告创意人才的胜任力特征模型,以胜任力模型作为人才的能力和素质的鉴别标准以便为以后的研究指明方向。

价值链生命周期的研究属于全球价值链理论体系中的一部分,它探讨了一条全球价值链从形成到成长到成熟到衰退消亡的整个演变过程,以及在整个演变过程中全球价值链内部结构和外部特征的变化及内在联系。本文对价值链生命周期的研究是从竞合关系的视角切入的。通过梳理价值链生命周期中主体间的竞合关系,对其形态和变化加以分析,可以为把握全球价值链生命周期的演变过程提供有效的理论依据和评判指标。在对生命周期的判定上,本文采用了多目标模糊决策中的TOPSIS方法,并以汽车产业全球价值链作为具体演算实例,所使用的判定方法可以普遍适用于所有全球价值链生命周期判定问题。

During adopting threshold filtering of wavelet to process the vibration signal at the early stage,aiming to the defects of soft-threshold and hard-threshold,a new threshold function is designed,which combines both linear and nonlinear part,and can be put into practice of vibration signal processing after simulation.Factors show that this method can not only remove a lot of noise,but also keep the details of the signal,thus providing a condition for extracting clear fault features and analyzing these fault features.

市场经济突出的特点就是竞争。没有创新就没有竞争力,而决定个人发展的最主要因素,也在于其更新知识、创造知识的能力。针对高等院校工科专业创新型人才的特点,对工科专业创新型人才的培养模式进行了理论探索,给出了具体模式和相应的实践措施。

引起机械故障的原因是多方面的,一般是由于机械系统中某些元器件的损坏、老化和失效而造成的,而轴承又是机械系统中最容易损坏的关键零件。如果忽视轴承故障诊断和不及时更换,极易造成重大事故。因此研究滚动轴承的故障诊断技术具有很现实的意义。本文利用小波包络技术对故障轴承的信号进行处理,提取信号特征.实验结果表明小波包络技术能够很有效的提取滚动轴承的故障特征。

Based on the characteristics of the bilateral competitive market with incomplete information,the Cournot model was established to analyze the strategic bidding behaviors of power suppliers pursuing the maximum economic benefits.With consideration of transmission constraints,the method of using two-level optimization search strategy to calculate the Cournot Nash Equilibrium was adopted to assess the market power.In the IEEE 30-bus calculation case,the equilibrium price in the complete competitive market was used as the basis to analyze and compare the mar- ket power of the oligarchic competitive market under the conditions of complete information and incomplete informa- tion.Simulations show that the market power analysis method is useful to mareket supervisors to measure and control the market power and consequently enhance market supervision.

以随机生产模拟为工具,较全面地形成发电边际价格,发展了各种加权平均值,形成上网电价体系.对省级电力市场交易的模式,省调的基本职能、调度执行、考核,输电服务及其费用、技术支持进行较详细的讨论.对供电局的市场化提出建议.