基于虚拟MIMO的TD-LTE终端省电机制

介绍了无线资源管理上行链路中的虚拟MIMO技术,分析了该技术几种常用的用户配对方案的优缺点,最后重点分析了虚拟MIMO技术在TD-LTE系统中用来提高能量有效性的可能,并提出了基于虚拟MIMO的TDLTE终端省电机制的构想。     

具有不可链接性的无线通信匿名认证

客户端-服务器认证协议的匿名性指服务器能够认证客户端的真实性,但无法获知客户端的身份。针对认证协议提出了新的安全性需求—不可链接性,该性质是对匿名性的有益补充。对已有文献中的认证协议进行修正,使其在不降低认证效率的前提下满足不可链接性。修正后的方案同时提供身份保护性、不可链接性、双向认证、密钥协商、密钥更新、会话密钥的后向保密性以及客户端的口令修改功能。     

Web日志挖掘中预处理过程的具体研究

Web日志的数据预处理是Web日志挖掘过程中基础而关键的一步,对之后的模式识别和模式分析有着很大的影响。为了达到有效处理数据的目的,针对此预处理过程中的5个步骤逐一进行分析,并在事务识别这一步骤中,比较了常用的两种算法。最后,基于这些算法思想,在Windows平台下,采用Java语言实现了Web日志预处理。实验结果表明是有效的。     

多服务多用户OFDM系统资源分配算法

提出了一种正交频分复用（OFDM）系统的多服务多用户资源分配算法。与传统多用户OFDM系统资源分配算法只考虑一种类型的服务不同,提出的算法同时考虑了数据业务和语音业务,分析了两种业务不同的资源分配需求,对语音业务采用了时分多址（TDMA）的方式,并且加入了对每种数据业务最低传输速率的要求。仿真结果表明,新算法能够在满足语音用户固定传输容量的基础上,提升数据用户总的传输容量,同时保证每一个数据用户的最低传输容量的要求。     

基于Web软件的权限动态管理设计与实现

在Web应用软件中,权限管理是常见的功能,不同用户具有不同的软件使用权限,系统根据登录用户的角色来完成权限的审定,从而进入用户的软件使用界面。在实际应用中,登录用户的权限有时会根据实际情况发生变化,从而需要调整相应的用户权限,常规的权限管理无法适应权限的动态变化。为解决这种问题,设计了一种高效的权限管理方案,利用该方案实现了用户权限的动态管理,该设计方案已用于实际的软件项目中,极大地提高了权限管理的灵活性、方便性和高效性。     

Defocus and binocular vision based stereo particle pairing method for 3D particle tracking velocimetry

We propose a new method, based on the depth-from-defocus technique and binocular vision, for solving the stereo particle pairing problem in 3D particle tracking velocimetry (PTV). Firstly, the apparent particle depth is measured with a single camera, using the depth-from-defocus technique. Secondly, a strict mathematical model of the particle-to-particle correspondence relationship between the left and right images, taking into account the refractions at the interfaces in the optical path, is presented, with the assumption that the apparent particle depth is measured. Thirdly, based on the apparent particle depth and particle-to-particle correspondence relationship, the epipoplar line is truncated into a short line segment by cutting off, where the apparent particle depth extends beyond its estimated range. For the first time, the range of the blur circle radius is employed as an additional stereo particle pairing constraint. Finally, the optimal pairing particle is selected by applying the epipolar line segment and blur circle radius constraints. The experimental results show that the rate of correct pairing is significantly improved compared with the epipolar line nearest neighbor analysis, especially when the particle density is increasing.     

Solving the logit-based stochastic user equilibrium problem with elastic demand based on the extended traffic network model

This paper proposes a novel extended traffic network model to solve the logit-based stochastic user equilibrium (SUE) problem with elastic demand. In this model, an extended traffic network is established by properly adding dummy nodes and links to the original traffic network. Based on the extended traffic network, the logit-based SUE problem with elastic demand is transformed to the SUE problem with fixed demand. Such problem is then further converted to a linearly constrained convex programming and addressed by a predictor–corrector interior point algorithm with polynomial complexity. A numerical example is provided to compare the proposed model with the method of successive averages (MSA). The numerical results indicate that the proposed model is more efficient and has a better convergence than the MSA.     

基于非适应性组合群测的多路存取信道模型的构作

在多路存取信道中当前用户的信息传输是计算机通信网络的一个重要内容,基于组合群测理论构作了多路存取信道模型,介绍了它在多路存取信道中当前用户信息传输方面的应用.     

住宅小区用户驻地网共建共享方案研究

在多运营商全业务竞争环境下,对住宅小区用户驻地网的共建共享问题进行分析研究,提出住宅小区用户驻地网的建设思路、网络分层及共建共享方案,对于多运营商和谐有序竞争、落实共建共享、避免重复建设政策有一定的借鉴作用和指导意义。