MMS系统网络结构和模块功能分析

多媒体消息服务是近年来发展活跃的移动终端业务,介绍了一种综合的多媒体消息服务网络结构,引入了服务器代理和移动终端用户代理来优化多媒体消息服务中心的性能,服务中心的适配机制使不同性能的手机终端得到协调使用.     

A/D转换器测试过程中频谱泄漏的抑制

提出了一种改进的激励波形和一种改进的频谱分析方法，用于A／D转换器的测试。改进的激励波形有效地解决了信号输入频率不确定的问题，并且能够很好地抑制噪声的干扰；改进的频谱分析方法通过对信号进行预处理，然后再进行傅里叶变换，改善了数据处理的精度。这两种方法相结合，很好地抑制了频谱泄漏，明显提高了A／D转换器测试的准确度。     

同步齿轮对分级破碎机转速影响的动态研究

为研究增加同步齿轮结构对分级破碎机齿辊转速的作用影响,文章对工业现场同步齿轮机构改造前后的两台分级破碎机齿辊转速进行对比测试,提出并计算了能够表征齿辊转速稳定性和同步性的相关系数|后运用高速摄影技术探究同步状态下齿轮机构的运动规律。结果表明：分级破碎机同步齿轮机构的应用起到了优化齿辊转速同步性和稳定性的作用。     

Synchronized arc routing for snow plowing operations

This paper introduces a synchronized arc routing problem for snow plowing operations. In this problem, routes must be designed in such a way that street segments with two or more lanes in the same direction are plowed simultaneously by different synchronized vehicles. A mixed integer formulation and an adaptive large neighborhood search heuristic are proposed. The performance of the proposed algorithm is evaluated over a large instance set, including artificial and real data. Computational results confirm the efficiency of the algorithm.     

On decentralized adaptive full-order sliding mode control of multiple UAVs

In this study, a novel decentralized adaptive full-order sliding mode control framework is proposed for the robust synchronized formation motion of multiple unmanned aerial vehicles (UAVs) subject to system uncertainty. First, a full-order sliding mode surface in a decentralized manner is designed to incorporate both the individual position tracking error and the synchronized formation error while the UAV group is engaged in building a certain desired geometric pattern in three dimensional space. Second, a decentralized virtual plant controller is constructed which allows the embedded low-pass filter to attain the chattering free property of the sliding mode controller. In addition, robust adaptive technique is integrated in the decentralized chattering free sliding control design in order to handle unknown bounded uncertainties, without requirements for assuming a priori knowledge of bounds on the system uncertainties as stated in conventional chattering free control methods. Subsequently, system robustness as well as stability of the decentralized full-order sliding mode control of multiple UAVs is synthesized. Numerical simulation results illustrate the effectiveness of the proposed control framework to achieve robust 3D formation flight of the multi-UAV system.     

基于SDH技术传输的雷达情报引接

提出了基于SDH（同步数字系列）传输技术实现雷达数据宽带传输的方案，给出了实现雷达数据传输的SDH网络拓扑结构和虚级联的数据通道分配方案。     

Synchronous quality function deployment (QFD) over world wide web

Quality function deployment (QFD) is one of the formal techniques for effective product development. Its main purpose is to listen to the voice of the customer and deploy it down the stream of product development with minimum loss or distortion. It achieves this purpose by using a series of matrices. QFD is a team tool. However, most of computerized QFD systems are standalone and therefore offer limited support for teamwork. This paper proposes to employ the world wide web (WWW, web) technology to provide QFD services on the Internet/Intranets. The synchronized collaboration between team members distributed geographically and over time is particularly emphasized in this development. The resulting web-based QFD system requires no installation or maintenance on the client side but offers remote and simultaneous accesses and therefore supports better teamwork.     

Synchronization and synchronized periodic solution in a simplified five-neuron BAM neural network with delays

A delay-differential equation, modeling a bidirectional associative memory (BAM) neural network with five neurons, is considered. Some results of synchronization and bifurcation are exhibited. By Lyapunov functional methods, some sufficient conditions for the absolute synchronization of the system and global attractivity of the trivial solution are established. This synchronization is independent of the size of time delay. Furthermore, delay-induced synchronized periodic solution is given analytically, as well as necessary and sufficient conditions for the synchronized periodic solution by perturbation-incremental scheme (PIS). The main difference in this paper from previous works in the literatures is that delay-induced synchronization is studied quantitatively. Theoretical results are illustrated with numerical simulations.     

LR(0) conjunctive grammars and deterministic synchronized alternating pushdown automata

The paper introduces a subfamily of synchronized alternating pushdown automata, deterministic synchronized alternating pushdown automata, and a subfamily of conjunctive grammars, $LR(0)$ conjunctive grammars. It is shown that deterministic synchronized alternating pushdown automata and $LR(0)$ conjunctive grammars have the same recognition/generation power, analogously to the classical equivalence between acceptance by empty stack of deterministic pushdown automata and $LR(0)$ grammars. These models form the theoretical basis for efficient linear time parsing of a subfamily of conjunctive languages which properly includes the classical $LR(0)$ languages.     

流式媒体同步集成技术在远程教学信息系统中的应用

现代教育技术并不等于现代远程教育,在教学过程中使用了现代信息技术并不就是现代远程教育。如何将数字视频／音频信息融于Web授课课件,这是当前远程教学和教育技术领域的新课题,该文介绍远程教学信息系统建设过程中进行的探索和实践。