最优实数态克隆作为标准BB84方案的最优个体窃听攻击

我们给出最优ARSC是对标准BB84方案的最优个体窃听分析.基于量子克隆的个体窃听,说明在由Csiszár和Korner定理的密钥产生率的两个充分条件中,其中一个可以作为最好的充分条件.     

由整数有限域矩阵方程及其解的逆矩阵实现的新密码体系

基于整数有限域中一类矩阵方程的唯一解问题,结合能实现秘密共享的Diffie-Hellman协议,设计了一种以下三角阵的逆矩阵为明文、以对称矩阵为密文、密文信息冗余的密码体系.数值算例验证了新密码体系的可行性和正确性.     

手机USB数据线测试仪的研制

针对企业生产手机USB数据线时需要进行性能测试方面的要求,设计出一款以FPGA为处理核心,USB接口芯片为控制对象,辅之电源、存储器、键盘、显示、静电保护和反馈输出接口等模块组成的手机USB数据线测试仪。该测试仪按照USB通信协议把USB数据包通过被测数据线进行传输,然后通过计算其传输USB数据包的错误率来判断数据线性能的质量好坏。通过与误码率分析仪、电脑海量传输实测的结果对比和实际应用表明,该仪器较其它测试方法具有测试速度快,测试结果准确等优点,可广泛地应用于USB数据线生产企业。     

Staining of proteins for 2D SDS‐PAGE using Coomassie Blue—speed versus sensitivity?

Several new fast staining protocols for the visualization of proteins separated by SDS‐PAGE utilizing Coomassie Blue staining (CBS) have been described in literature. The sensitivity of a newly designed staining protocol is usually estimated using 1D SDS‐PAGE of serially diluted protein samples. However, this approach is not predictive and satisfactory for 2D SDS‐PAGE capable of resolving hundreds or thousands of different proteins in a single analysis. In this work, a new fast staining protocol recently introduced by Dong et al. (PLoS One 2011, 6, e22394) was compared to colloidal CBS. The number of detectable spots in 2D SDS‐PAGE of identical blood plasma samples in repeated runs was chosen as a sensitivity criterion. Further, the influence of gel boiling on the subsequent protein identification by MS was investigated. In spite of its advantages, the staining protocol according to Dong et al. (PLoS One 2011, 6, e22394) seems to be less sensitive than colloidal Coomassie staining when the number of detected spots is the evaluating criterion. No obvious influence of gel boiling on the protein identification was observed.     

A five-step formal synthesis of (−)-Jaspine B

A new application of the sequential hydrolysis-oxidation-Wittig olefination (SHOWO) protocol to a d-glucose derivative, and an anomeric deoxygenation reaction of a xylo-d-furanose derivative is presented for the five-step formal synthesis of (−)-Jaspine B.     

基于提高精度的量子雷达方案及其进展

定位测量一直是人们关注的问题,将量子技术应用于定位任务有望展示出经典定位方案无 法达到的优势。目前,已有部分量子雷达方案被提出,展示了科研工作者从量子信息角度对定位 测量的新思考。本文总结了部分已有的量子雷达方案,介绍了相关方案的概念和分类,并着重对 量子定位、量子照明和三维增强雷达三种方案的基本原理进行论述,同时分析了各方案的优势以 及亟待解决的问题。     

Cross-layer design based hybrid MAC protocol for cognitive radio network

A minimal interrupted communication link setup is the primary objective of the MAC layer. The MAC layer is responsible for accessing the communication channel. At MAC, a control channel is used in the selection of collision free paths for data transfer. Therefore, the design of the control channel plays a pivotal role in achieving desired QoS in cognitive radio (CR) technology. Various schemes of control channel design help the CR network (CRN) to obtain better performance. The reported work focuses on a hybrid MAC protocol. The novelty of the scheme lies in the process of hybridization. A cross-layer framework is proposed for hybridization. The cross-layering has been done between network and MAC layer to achieve hybridization between different control channel design approaches. The broad categorization of control channel designs is between licensed in-band and dedicated unlicensed out-band approaches. In the in-band control channel design approach, the opportunistic use of data channel as control channel fulfills the decorum of CR technology. As soon as the primary user activity rises in the data channels, the in-band approach suffers from poor performance. On the other hand, the dedicated unlicensed out-band control channel design approach provides global coverage and all-time availability but suffers from channel saturation and intruder attacks. Interference in the control channel limits the use of out-band design. This motivates authors to develop a hybrid MAC protocol that can float between licensed in-band design and unlicensed out-band design to access the control channel. The hybridization is possible by sharing a primary user free channel list (PCL) among CR nodes. In conventional hybrid MAC protocols, the PCL is shared as a control beacon in the channel. Extra packet requirement as control beacon affects the performance of CR scenario. The proposed cross-layer design based hybrid MAC protocol avoids the need of an extra control beacon for PCL transmission. Further, the hybridization helps in achieving advantages of both in-band and out-band control channel design approaches. The simulation results show that the proposed hybrid MAC protocol performs satisfactorily in terms of packet delivery ratio, average throughput, average delay and control overhead. The performances are also tested in the worst scenarios.     

Adaptive coding clustered routing protocol for energy efficient and reliable WSN

In Wireless Sensor Networks (WSNs), the sensor nodes are expected to remain autonomous for a long time and the communication must be successful. So, energy efficiency and communication reliability are the main challenges for WSN. Routing protocols and, in particular, clustering is the key to energy constraints in WSNs. In a loss milieu, data shared between nodes is susceptible to corruption by errors caused by signal fading, random noise, and some other forces. For this reason, channel coding is necessary to assure efficient and reliable transmission. Therefore, energy efficiency and reliability of communications are the most crucial factors in the design of an efficient cluster-based routing protocol. In this context, to raise the reliability of the communication link and minimize the necessary transmission energy, a new adaptive coding routing protocol is proposed, which implements RS and LDPC codes to a routing protocol. Simulation results show that our proposed protocol improves energy consumption, network lifetime, stability, and throughput compared to LEACH and BRE-LEACH. In addition, it reaches a good BER performance and coding gain by using the LDPC code.     

分布式控制光网络的一种高效信令协议

为了在光网络中建立连接,信令协议需要依次配置路径沿途节点上的光交叉矩阵完成.提出了一种高效的信令协议,使各节点的光交叉矩阵的切换过程并行完成,可在光网络中实现快速光路供给.在分布式离散时间仿真平台上所做出的深入仿真结果表明此信令协议能够获得比反向预留信令协议更好的网络性能,可获得更低的阻塞概率、更短的平均连接时间和最长连接时间,尽管可能付出了稍高一些的控制带宽的代价.     

Continuous‐variable quantum information processing

Observables of quantum systems can possess either a discrete or a continuous spectrum. For example, upon measurements of the photon number of a light state, discrete outcomes will result whereas measurements of the light's quadrature amplitudes result in continuous outcomes. If one uses the continuous degree of freedom of a quantum system for encoding, processing or detecting information, one enters the field of continuous‐variable (CV) quantum information processing. In this paper we review the basic principles of CV quantum information processing with main focus on recent developments in the field. We will be addressing the three main stages of a quantum information system; the preparation stage where quantum information is encoded into CVs of coherent states and single‐photon states, the processing stage where CV information is manipulated to carry out a specified protocol and a detection stage where CV information is measured using homodyne detection or photon counting.