德州仪器携手美光Aptina成像部以模拟视频摄像机的价位实现高清质量的IP监控网络

<正>最新监控摄像机参考设计提供简易且灵活的IP视频升级路径随着监控摄像机系统从传统的CCTV技术过渡至高质量IP网络,监控摄像机系统设计人员正面临着降低整体系统成本、改善影像质量、降低摄像机设计复杂性以及缩短安装时间等一系列技术挑战。德州仪器(TI)与美光科技有限公司旗下Aptina成像部门致力协助客户解决上述问题,于日前宣布联手推出基于TI达芬奇     

Dynamical characteristics of software trustworthiness and their evolutionary complexity

Developing trusted softwares has become an important trend and a natural choice in the development of software technology and applications, and software trustworthiness modeling has become a prerequisite and necessary means. To discuss and explain the basic scientific problems in software trustworthiness and to establish theoretical foundations for software trustworthiness measurement, combining the ideas of dynamical system study, this paper studies evolutionary laws of software trustworthiness and the dynamical mechanism under the effect of various internal and external factors, and proposes dynamical models for software trustworthiness, thus, software trustworthiness can be considered as the statistical characteristics of behaviors of software systems in the dynamical and open environment. By analyzing two simple examples, the paper explains the relationship between the limit evolutionary behaviors of software trustworthiness attributes and dynamical system characteristics, and interprets the dynamical characteristics of software trustworthiness and their evolutionary complexity. Supported partially by the National Basic Research Program of China (Grant No. 2005CB321900) and the National Natural Science Foundation of China (Grant No. 60473091)     

电子政务系统的复杂适应系统建模

该文在参阅国内外复杂系统科学相关文献的基础上,对电子政务系统的复杂性进行探究,并利用复杂系统科学的复杂适应系统理论对电子政务系统进行了概念建模,以期能达到借鉴复杂系统科学的思想与方法,改进电子政务系统设计工作的目的。     

一种带有链约束的连续型批处理机调度问题

针对链式约束下工件释放时间和工期同序的情况,证明了即使所有工件都是单位加工时间时,极小化最大拖期问题也是强NP-难的.对于工件的零时刻都到达且同一链中工件工期相同的特殊情况,给出了多项式时间的最优算法.     

基于C0复杂度和能量的语音端点检测算法

复杂性测度是反映信号序列的一个重要的非线性特征,复杂性测度的语音端点检测技术具有非线性技术的本质特征。对C₀复杂度作出改进,并与增强后的短时能量相结合,提出了一种更有效的端点检测算法——C₀复杂度能量的语音端点检测方法。实验证明,该算法对噪声有很强的鲁棒性,在低信噪比（0 dB）下仍能准确地检测出语音段。     

基于ADC的TR-UWB数字接收机性能及其FPGA实现

发送参考超宽带(Transmitled reference UWB,TR-UWB)系统采用自相关接收检测技术作为一种非最优接收机,不需要进行信道估计和精确的时间同步,其结构简单、性能优良.数字化TR自相关接收机可以充分利用数字信号处理算法的优势,且易于用集成电路方法实现,其实现的关键是ADC.本文从理论上分析了ADC的抽样速率、量化阶数等对数字接收机的性能的影响,提出了过高阶数的量化并不能有效改善系统性能,并在FPGA上实现了TR-UWB接收机,通过编程设计与仿真,验证了基于ADC的TR-UWB接收机实现的可行性.     

两台流水机器协调分解调度问题

研究钢管加工流程中一类新型两台机器流水车间调度问题,工件在第一台机器上加工后被分解成多个子工件.对于最小化最大完成时间的情况,给出一个多项式时间的最优算法;对于最小化最大完成时间与惩罚费用之和的情况,给出一个拟多项式时间的动态规划算法;对于考虑生产前运输的最小化最大完成时间的情况,分析了问题的复杂性.证明了第一种情况的最优算法可作为后两种情况的2-近似算法.数值实验表明了算法的有效性.     

软件工程2008回顾

2008年对中国和世界来说是内容极为丰富的一年,相比之下,软件工程领域稍显平淡。在此笔者权且列出几件大事,作为过去一年的回顾吧。     

瞻博网络公司2009年行业内六大趋势预测

1 网络与数据中心合并 虽然企业用户已经开始以此作为降低运营费用的主要方式,但仍有许多网络过于复杂。2009年可望着眼于整体企业用户,真正解决网络复杂性的问题。     

A new ensemble feature selection and its application to pattern classification

Neural network ensemble based on rough sets reduct is proposed to decrease the computational complexity of conventional ensemble feature selection algorithm. First, a dynamic reduction technology combining genetic algorithm with resampling method is adopted to obtain reducts with good generalization ability. Second, Multiple BP neural networks based on different reducts are built as base classifiers. According to the idea of selective ensemble, the neural network ensemble with best generalization ability can be found by search strategies. Finally, classification based on neural network ensemble is implemented by combining the predictions of component networks with voting. The method has been verified in the experiment of remote sensing image and five UCI datasets classification. Compared with conventional ensemble feature selection algorithms, it costs less time and lower computing complexity, and the classification accuracy is satisfactory.