CGPSS-F仿真系统数据的采集与分析

本文详细地叙述了“医院门诊部为门诊病人服务的CGPSS-F仿真系统”数据采集与分析的方法.利用CGPSS-F仿真系统的驻留在队列中的实体数和资源处于繁忙状态的单元数,合理调整实体在系统的时间.根据资源容量的利用,实体排队的长度和实体在系统的时间,确定实用的系统参数.     

高分辨率谱估计算法MUSIC和Minimum-Norm及性能比较

本文从理论上详细叙述了高分辨率谱估计技术MUSIC和Minimum-Norm算法的机理,给出并比较了它们的空域谱平坦度、3dB谱宽度和谱峰值随信噪比的变化情况.文章对工程设计人员加深理解、选择算法具有一定的参考意义.     

一种新的基于Kohonen网络的图像矢量量化

矢量量化是一种重要的数据压缩方法.本文利用Kohonen自组织映射神经网络进行矢量量化,首次较为详细地讨论了具体实现的步骤与细节,并在此基础上为改善边缘质量,提出一种基于Laplas算子检测边缘弓引导神经网络训练的方法,并通过实验证明其效果是明显的.     

并行算法软件库PASL

本文介绍了并行算法软件库ＰＡＳＬ。ＰＡＳＬ库运行在具有共享存储的多处理机上，它可以用于科学工程计算和仿真。     

权重分析系统

本文利用加权模糊区间统计方法,对决策指标权重进行了讨论,并引入关联度的概念讨论了各专家的偏离度及一致性。     

部分充满介质的理想螺线管条件

一般教科书中都提到，理想螺线管（指内部磁场均匀，无漏磁）的条件是无限长（相对而言），绕线蜂蜜。但对绕线是否应该均匀则未做详细论述。本文试图指出，在无介质情况下理想螺线管的绕线都是均匀的，但在部分充满介质的情况下，均匀的绕线反而会破坏“理想”的条件。     

Probing met repressor-operator recognition in solution.

The three-dimensional crystal structure of the Escherichia coli methionine repressor, MetJ, complexed with a DNA operator fragment is described in an accompanying article. The complex exhibits several novel features of DNA-protein interaction. DNA sequence recognition is achieved largely by hydrogen-bond contacts between the bases and amino-acid side chains located on a beta-ribbon, a mode of recognition previously hypothesized on the basis of modelling of idealized beta-strands and DNA, and mutagenesis of the Salmonella phage P22 repressors Arc and Mnt. The complex comprises a pair of MetJ repressor dimers which bind to adjacent met-box sites on the DNA, and contact each other by means of a pair of antiparallel alpha-helices. Here we assess the importance of these contacts, and also of contacts that would be made between the C-helices of the protein and DNA in a previous model of the complex, by studying mutations aimed at disrupting them. The role of the carboxy-terminal helix face in operator binding was unclear, but we demonstrate that recognition of operator sequences occurs through side chains in the beta-strand motif and that dimer-dimer interactions are required for effective repression.