可升级的网络攻击检测问题的研究

In this paper, we initiate the study of identifying when and how a security attack detection problem can have a scalable solution. We use tools from Communication Complexity to prove that the common formulations of many well-known intrusion detection problems require per-flow state. Our theory exposes assumptions that need to be changed to provide scalable solutions to these problems; we conclude with some systems techniques to circumvent these lower bounds.     

六速双离合器自动变速器开发

简述了某六速双离合器自动变速器的机械传动系统结构,给出了该变速器最佳动力性换挡策略,并进行了NVH仿真分析.对所开发的液压阀体总成进行的试验表明,该阀体总成的挡位平均响应时间为30.6 ms,比目前国外同类样品响应时间快.介绍了所开发的湿式双离合器结构并进行了双离合器总成试验.结果表明,双离合器1可进行精确地换挡控制;双离合器2虽然能进行换挡,但不易进行精确控制.     

狮岭高架桥改建结构选型及设计探讨

针对狮岭高架桥扩建期间不能中断交通的要求,综合考虑施工阶段交通流的转换、施工工艺、原路基利用率、工程造价等因素的影响,通过方案比选,确定最优的上、下构方案。     

Evolving mechanism of eutectic carbide in as-cast AISI M2 high-speed steel at elevated temperature

AbstractThe evolution in type,size and shape of carbides in as-cast American Iron and Steel Institute(AISI) M2 high-speed steel before and after annealing were investigated.The micromechanism which was responsible for those changes was also analyzed and discussed.At the initial stage of reheating,metastable M2C-type carbide decomposed continuously.M6C-type carbide nucleated at the interface of M2C/γfirstly and grow from surface to center.Then MC-type carbide nucleated at both surface of M6C/M6C and inner of M6C.With the increasing decomposition of the metastable M2C-type carbide,the rod-shaped construction of eutectic carbide began necking,fracturing and spheroidizing gradually.Held enough time or reheated at higher temperature,particle-shaped product aggregated and grew up apparently,while secondary carbide precipitated in cell and grew up less sig- nificantly than the former.Based on the above microstructural observation,the thermodynamic mechanism for decomposition of M2C carbide,for spheroidization of products,and for the growth of particles were analyzed.The rate equations of carbides evolution were derived,too.It shows that the evolving rate is controlled by diffusion coefficients of alloy atoms,morphology of eutectic carbides and heating temperature.     

二甲醚客车燃料系统失效的故障树分析

介绍二甲醚客车燃料系统结构和常见故障模式;确定顶事件、中间事件和底事件及其关系;建立燃料系统失效故障树;定性分析故障现象、原因和排除方法,并提出防止燃料系统失效的对策建议。     

带有阻尼项的三维欧拉方程组球对称解

研究了一类带有阻尼项的三维等熵可压缩欧拉方程组经典解局部存在性和弱解的整体存在性。一方面利用对称双曲型方程组解的存在性结论,将该方程组转化为对称双曲型方程组,得到了经典解的局部存在性;另一方面由新坐标的引入,该方程组转化为比较熟悉的p-系统,并通过Glimm格式证明了它的整体弱解的存在性。     

ArcGIS Engine下三维仓库存取货路径优化研究

针对平面仓库管理应用不足,结合仓库基本优化规则和功能组成情况,通过搭建货物信息数据库,利用ArcGIS Engine对仓库空间进行模拟,结合货物信息和空间模型建立起一个三维仓库系统.将ArcGIS Engine应用于仓库管理和模拟,从而进一步扩充了GIS的应用领域,并利用改进Dijkstra算法优化三维仓库货物TSP路径选取问题.     

船舶伙食制冷系统的故障分析及处理

文章通过对伙食冰机操作和运行中出现的故障分析和研究,查明故障的原因并予以排除,同时简单介绍制冷系统故障诊断的一般方法。     

基于MATLAB仿真的国产铁路移频信号分析

讨论了国产18信息轨道移频信号和UM71轨道移频信号的时域和频域特性，分析轨道移频信号的载频、低频调制频率及频率偏移等参数特征，用MATLAB软件对国产铁路移频信号进行仿真，确定了其参数特征。     

北京地铁8号线通信传输系统衔接方案探讨

城市轨道交通既有线的改造工程类型各异,但普遍性与特殊性并存。北京市轨道交通8号线一、二期工程通信传输系统的衔接,是在不停运情况下对既有线路设备系统实施改造工程的典型案例。本文提出了"循序渐进"而非"一刀切"的网络割接方式,尽量避免对线路正常运营产生影响,实现新旧系统的顺利衔接。