基于WiFi的战术互联网路由协议性能分析

以分层分布式战术互联网实际应用环境为背景,在WiFi组成的战术互联网中,利用仿真平台QualNet对AODV、DSR、LAR、OLSR路由协议的性能进行了仿真比较．实验结果表明,AODV协议在高传输速率和大负荷的战场环境下,能更好地发挥其性能．     

Study on Unequal Error Protection for Distributed Speech Recognition System

At present ,the trend to ever-increasing use ofdata communication is spreading to the mobile wire-less world. The small portable devices will be used toaccess these data and cry out for i mproved user inter-faces using speechinput , whichis very i mportan…     

The electronic booklet on teaching-learning process: Teacher vision and parents of students in primary and secondary education

This article presents the first phase of a research project whose purpose is to introduce a new form of collaboration and communication between the school and the family through an Electronic Booklet (EB). The EB was developed due to the increasing necessity of collaboration between the school and the family, promoting the teaching-learning process and educational success, supported by information and communication technologies. These conclusions and justifications were derived from a survey based in a questionnaire applied to guardians and teachers of several private and public Portuguese schools of the primary and secondary education level. Both groups – guardians and teachers stressed the importance of communication between school and family and expressed interest in the EB as a communication tool. The analysis of the survey results made possible the construction of an Electronics Booklet prototype.     

Investigation of the effects of recycled engine oil bottoms on asphalt field performance following an oxidation modeling approach

This work investigates the effects of recycled engine oil bottoms (REOBs) on asphalt field performance by comparing asphalts with and without REOBs in terms of the asphalt properties required for pavement oxidation modeling. Specifically, oxidation reaction kinetics parameters, dynamic shear rheometer (DSR) function (DSRFn) hardening susceptibility (HS), and low sheer viscosity (LSV) HS are determined and compared for base binder, 5 wt.% REOBs, and 15 wt.% REOBs blends. At the higher percentage, addition of REOBs appears to increase the initial oxidation rate at field temperatures and significantly increases LSV HS, but does not significantly increase the DSRFn HS. A field modeling example elucidates the effects.     

DSR平整机板形控制能力分析

由于板带材是钢铁行业的主干产品,板形控制是板带轧机的关键技术,平整是提高板形精度的重要手段,平整机的板形控制能力直接影响到成品板带材的板形质量。利用建立的理论模型对DSR平整机各板形控制机构的板形调控功效进行了研究。计算了不同宽度下弯辊力及各压块力的板形调控功效曲线,为DSR技术的在线控制和设定提供了理论依据。     

基于动态剪切流变的沥青高温性能评价

通过动态剪切流变仪研究五种沥青高温特性,结合沥青混合料车辙动稳定度,分析不同指标对沥青高温性能的辨别力。研究表明:等效粘度η′=sinδ^{-4.862 8}G^*/ω预估60℃粘度值与车辙动稳定度评价结果一致,真空毛细管测定SBS粘度值偏大。橡胶改性沥青She-noy参数、T_G*/sinδ、G^*/sinδ值均最大,但其动稳定度却低于复合改性沥青。复合改性沥青的评价有待进一步研究。     

再生沥青PAV老化后性能评价分析

采用压力老化试验(PAV)对三种再生沥青进行长期老化,通过沥青组分分析、三大指标、DSR试验和BBR试验,分析老化作用对再生沥青性能指标的影响。结果表明,再生沥青经老化后,再生沥青B的饱和分含量增加,胶质含量降低,与其他沥青老化后组分变化不同;再生沥青A的软化点增长幅度最大,针入度和延度降低幅度最小;再生沥青C的抗车辙因子小于其他两种再生沥青;当温度低于70℃时,抗车辙因子对温度变化敏感;回收沥青的蠕变劲度高于其他沥青,再生沥青的低温抗裂性能与基质沥青相近。     

PVP修饰石墨烯对SBS改性沥青流变性能的影响

为研究经聚乙烯吡咯烷酮(PVP)处理后的石墨烯对SBS改性沥青流变性能的影响,通过高速剪切机在SBS改性沥青中掺入PVP修饰石墨烯,制备了石墨烯-SBS复合改性沥青,并采用动态剪切流变仪、温度扫描和线性振幅扫描试验,对复合改性沥青流变性能及抗疲劳性能变化规律进行研究,同时结合弯曲梁流变仪试验探索了复合改性沥青低温抗裂性的变化规律.试验结果表明:PVP修饰石墨烯的掺入能够有效改善SBS改性沥青在高温条件下的抗变形、弹性恢复能力以及抗疲劳性能;PVP修饰石墨烯的掺入对复合改性沥青的低温抗裂性能存在负面影响,但影响不明显.     

基于聚合签名算法的DSR路由认证技术

分析了Ad Hoc网络中DSR按需路由发现原理及黑洞攻击原理,针对DSR路由协议面临的黑洞攻击问题,提出了一种基于JYH聚合签名算法的路由记录认证机制,新方案在DSR路由请求和路由应答消息中定义了路径证明属性,并设计了与之适应的输入签名算法和输出验证算法;最后,采用形式化逻辑SVO方法对该路由记录认证机制的安全性进行了分析。分析表明,提出的路由记录认证机制可以有效抵御针对DSR路由协议的黑洞攻击。     

Ad Hoc网络中DSR协议的QoS改进算法

针对AdHoc网络中基于资源预留的QoS算法所带来的复杂度问题,本文引入了适合该网络的测量可用带宽算法,并且提出了新的DSR-QoS改进算法。仿真结果表明,在网络业务较大的时候这种改进是有效的,适合实时业务的传输;在网络业务较小的时候,这种改进的效果不是很明显。