A Role Based Privacy-Aware Secure Routing Protocol for Wireless Mesh Networks

Wireless Mesh Networks (WMNs) have drawn much attention for emerging as a promising technology to meet the challenges in next generation networks. Security and privacy protection have been the primary concerns in pushing towards the success of WMNs. There have been a multitude of solutions proposed to ensure the security of the routing protocol and the privacy information in WMNs. However, most of them are based on the assumptions that all nodes cooperate with routing and forwarding packets and the attacks are from outside. In order to defend against the internal attacks and to achieve better security and privacy protection, this paper proposes a role based privacy-aware secure routing protocol (RPASRP), which combines a new dynamic reputation mechanism with the role based multi-level security technology and a hierarchical key management protocol. Simulation results show that RPASRP implements the security and privacy protection against the inside attacks more effectively and efficiently and performs better than the classical hybrid wireless mesh protocol in terms of packet delivery ratio and average route length.     

a—Si：H TFT电流—电压特性研究

本文发展了一种研究ａ－Ｓｉ：Ｈ ＴＦＴ电流－电压特性的新方法。基于局域态电荷密度解析统一模型，提出并深入分析了沟道区有效温度参数的概念，并由此推导出了ａ－Ｓｉ：Ｈ ＴＦＴ电流－电压特性的解析表达式。其理论值与实验值符合很好。该模型可用于ａ－Ｓｉ：Ｈ ＴＦＴ静态特性分析及其电路优化。     

基于WTK的分布式虚拟环境网络通信机制研究

分布式虚拟环境(Distributed Virtual Environments,DVEs),其网络通信模块的开发,技术复杂,工作量大。WTK支持分布式虚拟环境,可实现高效系统开发。介绍WTK的网络体系结构,重点分析了分布式虚拟环境的网络结构、通信模型,深入研究了状态更新消息传递机制。在此基础上,给出了一个基于WTK实现分布式虚拟环境的设计方案,并介绍应用程序仿真循环。     

并元加集与二元并元码

本文首先进一步研究了并元加集存在的必要条件，从而提出了二元并元码所具有的长度。然后给出了一系列二元并元码的构造方法。证明了存在长度为２２ｔ＋２的二元并元码，相应地证明了存在参数为（２２ｔ＋２，２２ｔ＋１±２ｔ，２２ｔ±２ｔ）的并元加集。     

双闪耀光栅的计算机设计与制作方法

提出一种用计算机设计制作的双闪耀光栅，是在闪耀光栅和双频光栅基础上发展起来的一种新型光学元件，是由微闪耀光栅列阵组成的、兼有闪耀光栅和双频光栅的优良特性。     

Media Independent Mobility Management for D2D Communications over Heterogeneous Networks (HetNets)

The rapid growth of traffic demand and innovation of mobile networks have pushed the current communication infrastructure to provide a tight integration of different wireless technologies. On the one hand, all user connections are expected to be heterogeneous in future networks and thus an intelligent mobility management is essential to satisfy the requirements of lower latency, less power consumptions and last but not least possible uninterrupted ongoing session when a User Equipment (UE) moves across network boundaries. On the other hand, Device-to-Device (D2D) communication as a revolutionary technology to enhance network performance has shown a great potential in dominating future communication market. Consequently, in this paper, we investigate the mobility management problem for D2D communications in heterogeneous networks. We leverage on IEEE 802.21 Media Independent Service (MIS) and propose a new framework, so-called enhanced version of IEEE 802.21 MIS that supports D2D communication (E-MIS-D2D) to enhance D2D mobility experience over heterogeneous networks. The E-MIS-D2D is a network assisted and initiated architecture, in which a load-aware mode selection algorithm is also proposed for selecting the transmission mode between D2D and non-D2D modes. Through extensive simulations, we validate that the proposed method outperforms the existing methods in terms of packet loss ratio, average throughput, latency, bandwidth usage and load rate of eNB.

     

浅谈令牌环网络的发展方向

文章论述了令牌环网络的发展方向。并分析介绍了各类交换技术的特点。     

A robust ensemble data method for identification of human joint mechanical properties during movement

This paper describes a perturbation method for the identification of linear time-varying systems with an unknown input (voluntary joint input) using ensemble data. The method separates the unknown input and the perturbation through high-pass filtering and recasts the multi-input single-output system identification into single-input single-output system identification. The method is robust to intertrial variation, and can track changes of system dynamics up to 5 Hz. Analysis and simulation are given for the conditions similar to those for the human arm experiments. Experiments show that mechanical properties of the human elbow joint change with voluntary movement speed and that the mean stiffness with voluntary movement is in the range of the posture and is higher than reported before.     

Enhanced output power of (indium) gallium nitride light emitting diodes by a transparent current spreading-film composed of a disordered network of indium tin oxide nanorods

A thin film consisting of a disordered nanorod network of indium tin oxide (ITO) and conventional ITO films are fabricated on gallium nitride (GaN) based-light emitting diodes (LEDs) by electron beam evaporation. The surface morphologies are observed by scanning electron microscopy (SEM). The disordered nanorod network of ITO is grown in vacuum without oxygen. It can be applied directly on the LED as the current spreading film unlike other nanorods which require growth on a conductive layer. The transmittance, current–voltage characteristic, and the dependence of light output power on current are measured for disordered nanorod network ITO LEDs and conventional ITO LEDs, respectively. The measurement results indicate that the nanorod network provides a significant improvement in the light output power of GaN-based LEDs. The influence of the structure of ITO films on the light output power of GaN-based LEDs is discussed.     

Anisotropy of composite materials with inclusion with orientation preference

In this paper, the quasicrystalline model and the differential evolution strategy are applied to analyze the effective electromagnetic properties of composite materials with aligned nonspherical inclusions. The relationship between the effective wave number, volume concentration, direction of wave propagation vector, and aspect ratio of the inclusion particle are numerically studied. It is found that composite materials with small inclusion particles behave like uniaxial material. In addition, we observed general effective anisotropy in composite materials with larger inclusion particles.