过抽样四相混沌序列的构成及其扩频应用

结合Chebyshev源映射和通信原理中抽样理论,产生了过抽样混沌映射(OSCM),证明了OSCM也具备混沌特性.并提出利用最大平衡差函数考察序列平衡性.通过和源映射序列广义相关函数的对比,分析了自相关、互相关旁瓣的最大值和平均值,进而分析了四相OSCM序列的相关性.仿真结果表明:针对现行移动通信扩频系统地址码,四相ChebyshevOSCM序列具有良好的自相关和互相关性,可以增强系统的保密性和提升系统容量,是CDMA移动通信扩频系统地址码的优选方案之一.     

A formal framework for quantifying voter-controlled privacy

Privacy is a necessary requirement for voting. Without privacy, voters can be forced to vote in specific ways, and the forcing party can check their compliance. But offering privacy does not suffice: if a voter can reduce her privacy, an attacker can force her to do so. In this paper, we distinguish various ways that a voter can communicate with the intruder to reduce her privacy and classify them according to their ability to reduce the privacy of a voter. We develop a framework combining knowledge reasoning and trace equivalences to formally model voting protocols and define voter-controlled privacy. Our framework is quantitative, in the sense that it defines a measure for the privacy of a voter. Therefore, the framework can precisely measure the level of privacy for a voter for each of the identified privacy-reduction classes. The quantification allows our framework to capture receipts that reduce, but not nullify, the privacy of the voter.     

脑卒中发病环境因素分析及干预

基于2012年全国大学生建模竞赛C题数据,对脑卒中的发病因素进行分析。给出了脑卒中发病人群的基本描述,建立了脑卒中发病年龄的分布拟合,构建了脑卒中发病与环境因素的模型,分别对不同性别、不同职业、高危人群（年龄在60~80岁）以及发病高峰时期（每日发病人数不低于60人）进行分析讨论,从气温、气压等因素及其变化方面得到了有指导意义的结论。提出了针对性的预警干预方案,及进一步的改进方案。     

基于综合模拟法与支持向量机的水资源预警分析

提出并确定了哈尔滨市水资源可持续利用预警指标的警度.利用反馈法确定了预警指标的警限,采用2次检验的方法对其预警有效性进行了检验,设计了预警信号灯系统,并对哈尔滨市水资源可持续利用进行监测预警;运用支持向量机的方法预警指标值进行预测,对哈尔滨市水资源可持续利用进行趋势预警,包括单指标趋势预警和多指标趋势预警,进而获得了趋势预警的结果.     

基于国家安全视角的文化软实力测度模型及实证分析研究

在对文化软实力量化研究现状分析的基础上,从国家安全视角出发提出了文化软实力概念模型,通过对各维度凝炼构建了基于国家安全视角的6维度、25个二级指标的文化软实力测评指标体系,通过综合运用专家访谈法和层次分析法得到指标权重,综合运用问卷调查法和模糊综合评判法得到中国文化软实力测评结果.实证表明,测评结果和理论分析基本一致,研究方法具有较高的科学性和可信度.     

湖南省公众安全感调查问卷及其与信度和效度分析

本文根据公众安全感的概念架构,初步确定能够反应公众安全感的指标因素,编制了"公众安全感调查问卷"表。在湖南省内收集24519位公众调查样本,用Cronbach'sα系数信度、及θ系数、Ω系数信度和折半信度,并结合主成份方法,对公众安全感调查问卷的信度和效度进行详细分析和讨论。最后根据分析结果,对调查问卷表进行局部修订,修订后问卷的信度效度都有所提高。     

Spatio-temporal dynamics of security investments in an interdependent risk environment

In a globalised world where risks spread through contagion, the decision of an entity to invest in securing its premises from stochastic risks no longer depends solely on its own actions but also on the actions of other interacting entities in the system. This phenomenon is commonly seen in many domains including airline, logistics and computer security and is referred to as Interdependent Security (IDS). An IDS game models this decision problem from a game-theoretic perspective and deals with the behavioural dynamics of risk-reduction investments in such settings. This paper enhances this model and investigates the spatio-temporal aspects of the IDS games. The spatio-temporal dynamics are studied using simple replicator dynamics on a variety of network structures and for various security cost tradeoffs that lead to different Nash equilibria in an IDS game. The simulation results show that the neighbourhood configuration has a greater effect on the IDS game dynamics than network structure. An in-depth empirical analysis of game dynamics is carried out on regular graphs, which leads to the articulation of necessary and sufficient conditions for dominance in IDS games under spatial constraints.     

基于熵权的模糊物元模型在城市生态安全评价中的应用

在模糊物元分析的基础上,结合熵值法和欧氏贴近度概念,构建用于城市生态安全评价的模糊物元模型,详细介绍了该模型的计算步骤,应用该模型对郑州市的生态安全进行了综合评价,并将评价结果与灰色关联法的评价结果进行了比较.结果表明,建立的模型评价方法简单.评价结果可靠,具有一定的实用性.     

An IOT based smart grid system for advanced cooperative transmission and communication

In the Internet of Things (IoT) ecosystem, devices will predominate, using it in a manner similar to how people used it. Devices will cooperating in a multicast network to collect, share, and forward information way while interacting with one another autonomously and without centralised supervision. The building of an intelligent environment the capability of real-time collection of data, which is crucial for maximising the value of the IoT, will make this possible. A typical electric grid is made up of many power plants that use various power generating units, such as coal-based units, gas-based units, hydro units, etc. The majority of the infrastructure and wires that make up the conventional electricity grid have been in existence for a long time, it should be mentioned. They require significant investments, so providing them could take years. As a result, many grid components are outmoded and must be maintained and monitored on a regular basis to keep power flowing. A sophisticated technology is the smart grid (SG) system that makes it easier to integrate green technology and environmental considerations. The SG cyber–physical system was implemented thanks to the advancement and use of communication technologies in the conventional power system. The Internet of Things (IoT) and essential devices are both present in the complicated architecture of the SG systems. The traditional electric grids are been transformed into smart and efficient grid known as “Smart grid”. The Internet of Things’ smart grid allows for two-way communications among connected devices and technology that can recognise and respond to human needs. The cost and reliability of a smart grid are superior to that of conventional power infrastructure. Through use and data maintenance, smart grid technology will assist in reducing energy use and costs. One of the primary contributions made to grids is the integration of IoT with producing facilities using sustainable energy at various levels. To enhance the smart grid for bidirectional information exchange, improve power quality, and increase reliability Internet of Things (IOT) devices are becoming an important part of smart electric grid. IOT Infrastructure (IOTI) provide a flexible, efficient and secure platform providing strategic management for monitoring and controlling of different operations under different working conditions. This paper discusses cyber security on IOT based infrastructure for electric power systems. A comprehensive study is highlighted which includes type of IOTs, architecture used for smart grid, and future challenges.