基于IP的WCDMA R4业务承载网技术研究

在分析3G业务IP承载网QoS需求的基础上,重点讨论了基于IP技术的WCDMA R4版本业务承载网的建设思路及IP业务承载网的QoS策略问题.     

快速信道响应估计算法及其应用

本文给出了一个快速高效且易于实现的信道响应估计算法。对本算法的一系列仿真,将证明基于该算法的自适应均衡具有低SNR门限,能对付大幅度（包括0dB的付径）付径的特点。由于该算法占用的硬件资源很少,尤其适用于数字电视地面广播中的VSB（残留边带调制）接收机。     

An improved t‐out‐of‐n e‐lottery protocol

In 2009, Lee and Chang proposed an electronic t‐out‐of‐n lottery protocol over the Internet based on the Chinese remainder theorem and blind signature. However, a security flaw exists in Lee–Chang's protocol that the lottery agent and the malicious purchaser can collude to control the winning result, which is unfair for the honest participants. On the basis of a verifiable random number generated by using the Lagrange interpolation formula over a finite field, an improved t‐out‐of‐n e‐lottery protocol is proposed, which guarantees that each participant can generate the winning result equally. The improved protocol achieves public verifiability and fairness without a trusted third party and a delaying function, which makes it more robust and more efficient. Copyright © 2013 John Wiley & Sons, Ltd.     

Milnets用户基于电子邮件的图书催还预警系统

Milnets是军队院校图书馆通用的一套网络管理系统,该系统具有图书超期预警功能,但读者必须登录系统才能在线查询。为减少图书超期的现象,更好地为读者开展主动推送服务,在此介绍了一种适用于Milnets用户,基于电子邮件的图书催还预警系统。该系统在实际运用中,通过电子邮件的方式,能及时为读者进行预警,大大减少了图书馆图书超期的现象。     

反激型光伏微型逆变器不同工作模式的分析与比较

反激型光伏并网微型逆变器工作模式有不连续导通模式（DCM）和连续导通模式（CCM）两种。在工作原理的基础上,文中通过对这两种工作模式的分析和研究,推导了两种模式下逆变器主要参数的计算公式,从不同方面对两种模式的优缺点进行了对比分析,并得出相应结论,为根据设计要求合理选择逆变器的工作模式提供了理论依据。     

Lightweight,Superelastic Boron Nitride/Polydimethylsiloxane Foam as Air Dielectric Substitute for Multifunctional Capacitive Sensor Applications

Porous polymeric foams as dielectric layer for highly sensitive capacitive based pressure sensors have been extensively explored owing to their excellent flexibility and elasticity. Despite intensive efforts, most of previously reported porous polymer foams still suffer from difficulty in further lowering the attainable density limit of ≈0.1 g cm^?3 while retaining high sensitivity and compressibility due to the limitations on existing fabrication techniques and materials. Herein, utilizing 3D interconnected networks of few‐layer hexagonal boron nitride foams (h‐BNFs) as supporting frameworks, lightweight and highly porous BN/polydimethylsiloxane composite foams (BNF@PDMS) with densities reaching as low as 15 mg cm^?3 and permittivity close to that of air are fabricated. This is the lightest PDMS‐based foam reported to date. Owing to the synergistic effects between BN and PDMS, these lightweight composite foams possess excellent mechanical resilience, extremely high compressibility (up to 95% strain), good cyclic performance, and superelasticity. Being electrically nonconductive, the potential application of BNF@PDMS as a dielectric layer for capacitive sensors is further demonstrated. Remarkably, the as‐fabricated device can perform multiple sensing functions such as noncontact touch sensor, environmental monitoring sensor, and high sensitivity pressure sensor that can detect extremely low pressures of below 1 Pa.     

Delayed Fluorescence Emitter Enables Near 17% Efficiency Ternary Organic Solar Cells with Enhanced Storage Stability and Reduced Recombination Energy Loss

Charge transfer state (CT) plays an important role in exciton diffusion, dissociation, and charge recombination mechanisms. Enhancing the utilization and suppressing the recombination process of CT excitons is a promising way to improve the performance of organic solar cells (OSCs). Here, an effective method is presented via introducing a delayed fluorescence (DF) emitter 3,4‐bis(4‐(diphenylamino)phenyl)acenaphtho[1,2‐b]pyrazine‐8,9‐dicarbonitrile (APDC‐TPDA) in OSCs. The long‐lifetime singlet excitons on APDC‐TPDA can transfer to polymer donors to prolong exciton lifetime, which ensures sufficient time for diffusion and dissociation. Concurrently, the high triplet energy level (T₁) of the DF material can also prevent the reverse energy transfer from CT to T₁. APDC‐TPDA‐containing ternary OSCs shows a high PCE of 16.96% with a reduced recombination energy loss of 0.46 eV. It is noteworthy that the ternary OSC also exhibits superior storage stability. After 55 days of storage, the PCE of the ternary OSC still retains about 96% of its primitive state. Furthermore, this ternary strategy is efficient and universally applicable to OSCs, and positive results can be obtained in different systems with different DF emitters. These results indicate that the ternary strategy provides a new design idea to realize high performance OSCs.     

软交换网络监控模型的设计与应用

随着以软交换为核心的下一代网络的发展,如何在软交换网络中实现监听和控制成为了热点问题.文章重点研究了软交换网络自身的特性,分析了现有的软交换网络监听接口规范存在的不足之处,给出了一种可以同时实现对网络监听和接续控制的软交换网络监控模型设计方案.文章最后以SIP(会话初始协议)网络为例对该方案的应用进行了描述,并对监控的流程进行了具体的说明.     

Voice over wireless local area network

This paper introduces the special issue on voice over wireless local area networks (VoWLAN), which aim to foster interaction among researchers from both academia and industry in networking, wireless communications, and mobile computing. The special issue includes an article investigating the issue of determining an appropriate pricing strategy for VoWLAN provisioning. Also featured are two articles on polling as a solution for supporting real-time traffic over WLANs and another on media optimization network architecture (MONA).     

掺铈石英闪烁光纤的伽马传感特性研究

提出了基于溶胶-凝胶(Sol-Gel)法制备掺铈石英闪烁光纤,将其作为辐射传感头,搭建了对伽马辐射敏感的光纤传感系统。通过改变溶胶-凝胶中铈元素掺杂浓度,分别拉制出Ce与Si的摩尔分数分别为0.14%和0.22%的闪烁石英光纤。利用137Cs伽马辐射源,研究了闪烁光纤涂覆层、铈元素掺杂浓度及闪烁光纤长度等参量对辐射传感特性的影响。