产品族一主多从模型的分解协调方法

阐述了产品族设计中存在一类本身具有主从结构的问题。建立了一类产品族一主多从模型的一般形式,针对从者之间决策变量出现耦合的情形,通过在目标函数上添加偏差项,给出了一个分解协调的算法,使得从者之间变量独立。讨论了原问题的Pareto解与分解协调后问题可行解之间的关系,通过一个通用电机产品族的算例验证了方法的可行性。     

一种Ares协议的精确识别方法

针对单独的深度数据包检测(Deep packet inspection,DPI)技术无法识别加密报文,以及基于流量特征识别方法对流量检测的模糊性等问题,采用DPI和基于流量特征相结合的方法来对Ares协议进行精确的识别,以提高对Ares协议的识别效果,实验表明准确率可以达到97％以上.     

RFID系统防碰撞算法的研究及其改进

射频识别技术中,防碰撞问题是提高系统读取效率的关键问题。文章在传统防碰撞算法的基础上,提出一种优化的基于动态帧时隙ALOHA的防碰撞（Improved dynamic framed slotted ALOHA,IDFSA）算法。实验结果表明：IDFSA算法大幅度地提高了系统的时隙利用率和读取效率。     

Energy efficient distributed steganography for secure communication in wireless multimedia sensor networks

A secure communication mechanism is necessary in the applications of Wireless Multimedia Sensor Networks (WMSNs), which is more vulnerable to security attacks due to the presence of multimedia data. Additionally, given the limited technological resources (in term of energy, computation, bandwidth, and storage) of sensor nodes, security and privacy policies have to be combined with energy-aware algorithms and distributed processing of multimedia contents in WMSNs. To solve these problems in this paper, an energy efficient distributed steganography scheme, which combines steganography technique with the concept of distributed computing, is proposed for secure communication in WMSNs. The simulation results show that the proposed method can achieve considerable energy efficiency while assuring the communication security simultaneously.     

A new approach to DVC combined with ROI extraction and residual video coding for multimedia sensor networks

The Wyner-Ziv distributed video coding scheme is characterized for its intraframe encoder and interframe decoder which can also approach the efficiency of an interframe encoder-decoder system. In Wyner-Ziv residual coding of video, the residual of a frame with respect to a reference frame is Wyner-Ziv encoded, which can reduces the input entropy and leads to a higher coding efficiency than directly encoding the original frame. In this paper, we propose a new approach of residual coding combined with Region Of Interest (ROI) extraction. Experimental results show that, the proposed scheme achieves better rate-distortion performance compared to conventional Wyner-Ziv coding scheme.     

Tcp-Peach改进算法在NS上的实现及其性能分析

Tcp—Peach算法针对卫星网中长时延和高误码率的特点,利用哑元设计了一种高效的TCP传输拥塞控制机制,文章对这种算法进行了改进,并且在NS上给予了实现,最后比较验证了它的性能。     

基于CC2420的无线传感器网络节点的设计

CC2420是Chipcon公司开发的一款符合Z igbee标准的低功耗射频芯片。在简要介绍无线传感器网络节点结构后,对CC2420芯片的功能特点进行了分析,并结合其工作原理和应用电路,设计了以ATmega128L为处理器、CC2420芯片为无线通信芯片的无线传感器网络节点。     

面向无线多媒体传感器网络的移动Sink路径规划

对无线多媒体传感器网络中的数据采集问题进行了研究.现有的数据采集方式多采用静态Sink的方式,容易导致热区问题,并且受到网络连通性的限制,通信开销也较大.移动Sink可以部分避免这些问题.但是如果Sink的路径规划不合理,反而会加剧上述问题.对此进行了研究,并提出了一种移动Sink数据采集协议DCPD.DCPD首先根据节点的分布选取一批采集点,并使用量子遗传算法计算出经过这些点的最短回路,Sink即以此作为运动路线,沿着它进行数据采集.理论分析和仿真实验表明,DCPD不仅工作效率更高,采集的数据量也更多.     

基于CORBA的负载平衡模型的研究与实现

CORBA提供了在异类分布式环境中对象之间高度的可互操作性，从而保证了建立在不同CORBA产品之上的分布式对象可互相通信。CORBA应用中一般都包含分布在不同环境下的大量对象，如何使得这些对象更好地协同工作是复杂的分布式系统中必然要考虑的问题。该文对当前的CORBA中负载平衡的发展现状作了简单介绍，并给出了一个使用TAO开发的基于CORBA的负载平衡解决方案和实现。     

Coarse-to-Fine Speech Emotion Recognition Based on Multi-Task Learning

Journal of Signal Processing Systems - Speech emotion recognition is very challenging because the definition of emotion is uncertain and the feature representation is complex. Accurate feature...