Rule-based models of multivariable functions

This study is devoted to fuzzy rule based modelling of multiple-input single-output nonlinear numerical relationships. The model under investigation is viewed as a collection of conditional statements “if state Ω_i then y = g_i(x, a_i)”, i = 1, 2,…, N with Ω_i being a fuzzy relation defined in the space of the input variables. In contrast to the commonly encountered identification approach that is dwelled upon discrete experimental data, the one proposed in this study is concerned with explicitly articulated nonlinear input-output relationship. The main thrust is in the development of a fuzzy partition of the input variables completed through a sequence of fuzzy relations rather than Cartesian products of fuzzy sets. This approach allows us to maintain the number of necessary rules under control and avoid a combinatorial explosion otherwise inevitable in situations of highly multivariable functions. Introduced are criteria of separability and function variability whose objective is to guide a distribution and granularity of the linguistic labels forming the condition part of the rules.     

基于MPEG-4的视频流式传输系统及动态带宽分配方法

提出了一个基于MPEG 4精细可分级编码技术的视频流式传输系统。介绍了系统中主要模块的作用,并重点研究了速率控制模块。速率控制模块采用了适合视频流式传输的动态带宽分配方法。它可以根据实时的网络通道波动状况来动态调整滑动参数,以适应网络波动和高效地利用网络的有限资源。实验结果表明,动态带宽分配方法在动态带宽波动条件下不仅可以使相邻帧间的视频质量更加平滑,而且可以大大提高解码视频图像的总体质量,也就是说可同时改善解码视频的主客观性能。     

RFID-generated traceability for contaminated product recall in perishable food supply networks

As perishable food supply networks become more complex, incidents of contamination in these supply networks have become fairly common. Added to this complexity is the fact that there have been long delays in identifying the contamination source in several such incidents. Even when the contamination source was identified, there have been cases where the ultimate destination of all contaminated products were not known with complete certainty due, in part, to dispersion in these supply networks. We study the recall dynamics in a three-stage perishable food supply network through three different visibility levels in the presence of contamination. Specifically, we consider allocation of liability among the different players in the perishable supply network based on the accuracy with which the contamination source is identified. We illustrate the significance of finer levels of granularity both upstream and downstream as well as determine appropriate visibility levels and recall policies.     

染料黑白片XP1 400的粒度研究

本文测定了依尔福染料黑白片XP1 400在XPI套药中冲洗的染料影像及中间银影像的均方根粒度,同时又测定了在同样曝光条件下的涂层在普通黑白显影液中冲洗的黑白银影像的均方根粒度。结果表明,三种影像粒度随密度变化的规律完全不同。本文又用selwyn公式计算了中间银影像及黑白银影像的单位面积显出颗粒数,测试和计算结果表明,与黑白银影像比较,中间银影像具有均方根粒度明显低和单位面积显出颗粒数高的特点。这与光学显微镜下现察到的中间银影像及黑白银影像的形态是一致的。本文还根据实验及计算结果讨论了DIR成色剂在影像形成过程中的作用。     

Parallel computer architectures: state of the art and trends

Summary An increasing number of parallel architectures is becoming available for numerically intensive applications. Many chemical problems need intensive calculations due to the complexity of the underlying physical models. Very often these applications show an intrinsic parallelism and therefore can be easily adapted to parallel machines. In the future, in addition to the classical numerically intensive applications, the use of these machines will be extended to a more general purpose use (e.g. data base machines, advanced graphics, AI and expert systems applications, etc.). The principal aim of this paper is to show the state of the art of the commercially available parallel architectures and related trends. A comparison of the main features of shared and distributed memory systems will be presented. The characteristics of coarse and fine grained architectures will be discussed. The analysis will include not only the large-scale machines (usually called supercomputers), but also smaller machines (e.g. minisuper and multicomputers) having a very favourable price/performance ratio.     

The Team Orienteering Problem with Time Windows: An LP-based Granular Variable Neighborhood Search

The Team Orienteering Problem (TOP) is a known NP-hard problem that typically arises in vehicle routing and production scheduling contexts. In this paper we introduce a new solution method to solve the TOP with hard Time Window constraints (TOPTW). We propose a Variable Neighborhood Search (VNS) procedure based on the idea of exploring, most of the time, granular instead of complete neighborhoods in order to improve the algorithm’s efficiency without loosing effectiveness. The method provides a general way to deal with granularity for those routing problems based on profits and complicated by time constraints. Extensive computational results are reported on standard benchmark instances. Performance of the proposed algorithm is compared to optimal solution values, when available, or to best known solution values obtained by state-of-the-art algorithms. The method comes out to be, on average, quite effective allowing to improve the best know values for 25 test instances.     

基于粒度的多方法评价结论一致性研究

引入多方法评价结论粒度一致的概念,定义了多方法评价结论粒度一致的粒度计算公式,运用粒度计算公式对一个评价问题的结果进行了粒度一致性分析.     

基于MAS的智能诊断技术集成方法研究

对于复杂分布式故障诊断的特点,集成多种智能方法求解是一种有效的途径.但如何确定这些诊断方法的相对诊断能力是基于多代理技术的故障诊断系统中的一个关键问题.文章基于问题求解的粒度理论,在对设备故障域进行分解的基础上,提出了基于多代理技术的三层评估模型,不仅能对诊断专家的诊断能力进行评估,而且也能对多诊断专家的协调诊断能力进行评估.该方法简化了问题求解的难度,提高了多专家评价的精度.可广泛应用于多诊断专家代理联盟的创建和诊断结论的融合中.     

基于商空间和信息粒度的Fuzzy聚类分析

传统聚类分析主要从相似性度量的不同设计和判别函数的选择等方面进行研究。本从商空间理论和信息粒度原理角度出发，引入分层递阶结构，论述聚类分析的本质以及Fuzzy聚类分析这种软件统计方法。     

Two-level hierarchical parallelization of second-order Møller-Plesset perturbation calculations in divide-and-conquer method

A two‐level hierarchical parallelization scheme including the second‐order Møller–Plesset perturbation (MP2) theory in the divide‐and‐conquer method is presented. The scheme is a combination of coarse‐grain parallelization assigning each subsystem to a group of processors, with fine‐grain parallelization, where the computational tasks for evaluating MP2 correlation energy of the assigned subsystem are distributed among processors in the group. Test calculations demonstrate that the present scheme shows high parallel efficiency and makes MP2 calculations practical for very large molecules. © 2011 Wiley Periodicals, Inc. J Comput Chem, 2011