Bidirectional controlled quantum teleportation and secure direct communication using five-qubit entangled state

A scheme is presented to implement bidirectional controlled quantum teleportation (QT) by using a five-qubit entangled state as a quantum channel, where Alice may transmit an arbitrary single qubit state called qubit A to Bob and at the same time, Bob may also transmit an arbitrary single qubit state called qubit B to Alice via the control of the supervisor Charlie. Based on our channel, we explicitly show how the bidirectional controlled QT protocol works. By using this bidirectional controlled teleportation, espcially, a bidirectional controlled quantum secure direct communication (QSDC) protocol, i.e., the so-called controlled quantum dialogue, is further investigated. Under the situation of insuring the security of the quantum channel, Alice (Bob) encodes a secret message directly on a sequence of qubit states and transmits them to Bob (Alice) supervised by Charlie. Especially, the qubits carrying the secret message do not need to be transmitted in quantum channel. At last, we show this QSDC scheme may be determinate and secure.     

高职计算机应用基础课程实训教学改革的探索与实践

根据高等职业教育的培养目的和教学特点以及非计算机专业《计算机应用基础》课程实践教学标准的要求,文章从加强《计算机应用基础》课程的实训教学出发,根据学生的不同专业和实际情况,探讨了加强实训教学的方法和科学合理检查和评价学生的方法,总结了《计算机应用基础》课程在高职教育教学改革中一些行之有效的经验,全面提高学生的计算机实际应用能力。     

基于B/S结构的高校教学管理信息系统的实现

教学管理信息系统的建立可以确保学校教学数据的一致性,实现数据信息资源的分级共享,替代原始的纸张流转。通过计算机和网络系统得以规范教务管理流程、学生管理流程。本文结合目前高等院校教学特点,介绍如何利用对象关系映射技术（ORM）构建B/S三层模式的教学管理信息系统。     

Numerical simulation of a nonlinearly coupled Schrödinger system: A linearly uncoupled finite difference scheme

This article describes a finite difference scheme which is linearly uncoupled in computation for a nonlinearly coupled Schrödinger system. This numerical scheme is proved to preserve the original conservative properties. Using the discrete energy analysis method, we also prove that the scheme is unconditionally stable and second-order convergent in discrete _L2$L_2$-norm based on some preliminary estimations. The results show that the new scheme is efficiency.     

基于J2ME的手机视频捕获方法的实现

针对当前对移动多媒体开发和应用的热潮,运用J2ME技术跨平台优势,将JMF和RMS有机结合,成功地实现了手机上的视频捕获并且改进了手机资源释放的问题,从而在一定程度上更有效地利用了手机的内存资源,同时也更加方便了数据的存储和管理,对手机多媒体开发具有很好的借鉴和应用价值。     

声学参量换能器阵及其测试系统设计

根据声学参量阵原理,设计了一个3×3的九元矩形换能器阵及其测试系统,并在空气进行验证性实验;系统包括正弦信号产生电路、信号控制电路、功率放大电路以及回波信号接收电路等,辅以LabVIEW平台,实现正弦信号和脉冲控制信号的产生,发射信号时间长度控制以及功率放大,并最终驱动换能器阵;实验表明,当有85kHz和90kHz的正弦信号产生时,系统各部分均能正常工作,能够听到天花板处有声响,且回波信号中含有5kHz的频率成分,即证明换能器阵及其系统的设计均是可行的.     

Iterative SNR estimation using a priori information

A class iterative signal-to-noise ratio (SNR) estimation algorithm is proposed in this paper. The data samples are governed by a given distribution with a priori. The expectation maximization (EM) algorithm is applied to iteratively maximize the likelihood function so as to realize the SNR estimation. Cramer–Rao bounds (CRB) with different a priori are compared for binary phase shift keying and orthogonal phase shift keying systems, which show the potential of the SNR estimator in turbo-like systems. In high-order modulations, simulation results show that the reduced-complexity iterative method with equal a priori has better performance in middle or high SNR region than the foregone ones. Moreover, the new method with feedback information is the best when its iteration number is 4 and extrinsic information larger than 0.4. These methods are applied in the bit-interleaved coded modulation with iterative decode (BICM-ID) system to validate the effect of the proposed methods.     

遗传编程在符号回归中的应用

遗传编程是一种新型的搜索优化技术,文章介绍了遗传编程的基本原理,以及遗传编程的算法设计及其实现的几个关键问题,并研究了基于遗传编程方法的符号回归。与传统回归方法相比,该方法得到的拟合函数更精确,具有更广泛的适用性。文中通过对一个函数进行符号回归验证,说明此方法合理可行。     

浅析高职院校数字化校园建设

介绍了数字化校园的建设原则、目标、以及学院分阶段实施数字化校园建设的规划.     

基于时空全局优化的视频修复

提出一种基于样本的视频修复算法,将视频修复问题看作是嵌入到时空视频体中的一个三维图的离散的全局优化问题,可有效地修复视频中较大破损的区域.首先建立待修复视频的马尔科夫随机场(MRF),然后设置新的目标函数,将修复问题转化为马尔科夫随机场的多标号问题,使待修复区域与其周围区域在颜色的相似性和运动的相似性保持一致性.进而提出了灵巧置信传播求解算法,有效求解此目标函数,大大降低了标准置信传播算法的时空复杂度.还提出了与视觉相关的像素权值的概念,使得算法能更好地按照视觉合理性计算时空块的相似度.对复杂动态场修复结果实验表明,较现有算法,文中算法能更好地修复出显著结构和运动信息.