A dynamic ID-based authenticated group key exchange protocol without pairings

So far, most of the proposed group key exchange (GKE) protocols do not consider the attack when the adversary reveals the parties’ephemeral private keys without their long-term private keys, so these GKE protocols are insecure on this attack. In this paper, for resisting above attack, we propose a dynamic authenticated group key exchange (AGKE) protocol in the ID-based setting. Different from previous ID-based protocols, our protocol does not utilize bilinear pairings, which makes it more efficient. At last, we analyze the security of the protocol in the eCK (enhanced Canetti-Krawczyk) security model.     

网络服务提供者侵权归责原则新论

近年来,随着网络侵权案件的层出不穷,网络服务提供者在网络侵权中的法律责任备受关注,而其前提是合理地确定网络服务提供者侵权归责原则,本文通过分析网络侵权行为特殊性,评述我国的立法现状,提出根据网络服务提供者的不同分类及不同侵权行为来合理确定网络服务提供者的侵权归责原则,构建以过错责任原则为主,无过错责任原则和公平责任原则为辅的归责原则体系,有效的平衡各网络主体之间的利益冲突,促进网络社会和谐美好的发展。     

Novel matched filtering method and its application

The method of using a narrowband filter to realize matched filtering is derived. A novel method of using spectrum sampling to realize matched filtering is presented, and the method can conquer the disadvantages that the narrowband filter cannot adopt the adaptive scheduling of phased array radars and realize matched filtering for several waveforms. A novel error extraction method is proposed, which uses a time division multipath method to realize the intermediate frequency extraction. This method can save lots of space for vehicle-born radar systems, reduce the influence of amplitude and phase distortion caused by devices, and enhance the system reliability. Simulation results show that the spectrum sampling method is applicable, and the implementation of frequency spectrum sampling is elaborated.     

Modeling simulation and experiment of micro-Doppler signature of precession

Spatial precession is a special micro-motion of the spinning-directional target, and the micro-Doppler signature of the cone-shaped target with precession is studied. The micro-motion model of precession is built first, and then the micro-Doppler model is developed based on the proposed concept of micro-motion matrix, by which the theoretical formula of micro-Doppler signature of precession is derived. In order to further approach to the actual case, the occlusion effect is firstly considered in micro-Doppler, and the simulated result with occlusion effect is well in accordance with the measured result in microwave anechoic chamber, which suggests that the micro motion model and micro-Doppler model of precession are both valid.     

浅谈军校学员心理问题及对策分析

随着社会的不断进步与发展,社会竞争加剧、生活节奏加快、工作学习压力增大,出现心理问题的人群正逐年扩大.心理问题已成为影响社会和谐和人们健康生活挥之不去的阴影.军校学员,作为中国军队新军事变革的生力军,其心理健康问题更是不容忽视.加强心理疏导,维护心理健康,使其具备过硬的心理素质,以培养造就新一代革命军人.     

基于节庆开发的区域旅游产品结构升级研究——以福建省环三都澳区域为例

节庆活动是一个区域文化的重要体现.从旅游业发展的角度,节庆活动可以演变为旅游节庆,成为旅游产品,在区域旅游业发展的过程中扮演积极的作用.笔者以环三都澳区域为研究对象,从旅游业发展的视角策划节庆活动的主题定位以及活动的策划,探讨节庆在环三都澳区域旅游产品结构升级中的作用机制.     

黄河三角洲贝壳堤岛中小型土壤动物群落结构

2008年5-10月,对山东省无棣县北部的黄河三角洲贝壳堤岛进行分层取样,研究中小型土壤动物群落结构.共获得各类土壤动物标本15 312头,隶属于7纲10目.结果表明:中小型土壤动物群落的主要优势类群为弹尾纲(跳虫)和蜱螨亚纲(螨类),常见类群为膜翅目,其它均为稀有类群.Shannon-Weiner多样性指数(H)为E＞C＞B＞F＞D＞A,弹尾纲和蜱螨亚纲动物个体数占该样地动物个体总数的百分比均超过40%,致使各样地的优势度指数普遍较低,最高仅为0.492 7.垂直分布显示中小型土壤动物不具有明显的表聚现象.根据Bray-Curtis相似性系数的聚类结果,可将6个样地分成3组,显示了中小型土壤动物对不同地点的响应情况.     

Preparation of photoanode and its application to flexible dye-sensitized solar cells

A TiO2 slurry was prepared by hydrothermal treating mixture of commercial TiO2 (P25),ethanol and distilled water in an autoclave.A flexible photoanode and dye-sensitized solar cell (DSSC) was fabricated on an ITO-coated poly (ethylene naphthalate) sheet (ITO/PEN) substrate by a doctor-blade technique.The sample was characterized with SEM,UV-vis,FTIR,and the photoelectric properties of the DSSC were measured.The influence of preparation conditions on the properties of the flexible DSSC was investigated.It is...     

先天性二叶式主动脉瓣的超声诊断及临床应用价值

探讨彩色多普勒超声诊断先天性二叶式主动脉瓣及其临床应用价值。重点观察大动脉短轴及主动脉长轴切面二叶式主动脉瓣的形态、回声、启闭及血流动力学特点,多普勒超声观察主动脉瓣口的血流情况。二维超声可清楚地显示主动脉瓣的数目、形态及有无合并其他畸形,随着年龄的增长,瓣膜增厚、钙化、血液动力学、心脏形态学改变逐渐加重。彩色多普勒超声对二叶式主动脉瓣畸形的诊断有重要意义,对选择治疗方案具有重要价值。     

地铁深基坑工程与环境因素

迄今为止,国内外对"深基坑"的深度还没有统一明确的定义,一般以6m的深度作为深基坑与浅基坑的界限.深基坑开挖,经常会发生坑底回弹、隆起及坑外地面下沉等现象,甚至发生支护结构失稳倒塌等事故,特别是在软土地基中,这种问题更为严重.