一种结合知识挖掘的进化规划算法

进化规划是一种进化计算方法。进化规划主要使用随机化技术来实现优化过程。与其它进化算法相比,进化规划只有变异操作,而没有交叉操作,因此变异操作的有效性对进化规划算法的成功至关重要。在传统进化规划算法中,进化规划的变异操作具有完全的随机性,这虽然有利于避免局部极值,但却导致较大的计算量。在本文算法中,将知识挖掘技术引入进化规划之中。知识挖掘技术主要用于发现规则,然后利用发现的规则指导变异操作过程,提高变异操作的效率。最终加快了进化规划算法的速度,而计算效果没有明显下降。通过知识挖掘技术的引入,进化规划算法有了初步的智能特性。将本文所介绍的新算法应用于视频编码的运动估计实验中,结果表明新算法有良好的计算速度和计算精确性。     

低压配电系统中零线电位升高的原因分析

在低压配电系统中,零线是接地的,与大地电位相同,即为零电位,但在实际应用中,零线电位不一定是零电位,针对这种情况,本文分析了零线电位升高的几种原因,提示电力部门加强零线管理,以防止人们因接触零线而触电是很重要的。     

鱼雷捷联系统动基座精对准的卡尔曼滤波法

为解决鱼雷捷联系统的初始对准，提出了失准角及陀螺随机常值漂移快速估计方法，经数字仿真，对缩短初始对准时间，提高初始对准精度有较好的效果。     

A Complete Critical Path Algorithm for Test Generation of Combinational Circuits

It is known that critical path test generation method is not a complete algorithm for combinational circuits with reconvergent-fanout.In order to made it a complete algorithm,we put forward a reconvergent-fanoutoriented technique,the principal critical path algorithm,propagating the critical value back to primary inputs along a single path,the principal critical path,and allowing multiple path sensitization if needed.Relationship among test patterns is also discussed to accelerate test generation.     

边梁效应的数值模拟

应用Fourier级数方法分析了具有边梁加固的板的弯曲问题，获得了Levy型的准确解，并利用该解模拟了边梁的效应，给出了板的挠度、糨矩及剪力等受边梁刚度影响的数值结果。结果表明：（1）忽略边梁的抗扭能力将导致显著的误差;(2)边梁的抗弯、抗扭性能应综合考虑，而不应作为两个相互独立的因素，否则将会出现板的挠度、内力等随边梁刚度的增大而增大的不合理现象。     

EMS中负荷预测不良数据的辨识与修正

分析了实际电力系统中负荷异常数据的主要成因，并针对2类主要的坏数据各自的特点，分别使用不同的方法处理负荷预测样本数据。针对自动化系统故障造成的坏数据，提出了具有负荷预测应用特点的总加值动态多源处理技术，从而能够充分利用采集设备或网络通道对负荷总加值而言的多重冗余配置；针对大负荷的突发性偶然波动造成的坏数据，采用对电网终端负荷的逐一扫描辨识，部分避免了对单一总加数据预处理的误判和漏判。     

魏玛的住宅和工作室

1923年,Bauheus建筑公司在德国东都魏玛城郊的住宅区开发了一套样板住宅．然而，由于地方当局的极力反对，这个项目未能付诸实施。只有被称做“角落之家”的一座住宅最终得以建成。1996年联合国教料文组织宣布将这座由Georg Munche设计的房子列入世界遗产名录纪念碑．     

基于XML技术数据库优化接入设计

鉴于用户对目前数据库接入技术要求的提高，一种基于XML技术对数据库接入进行优化的技术出现了。这种技术利用了基于XML传输时的可扩展、高度结构化等特性，在JavaBean，JDBC，Apache，Tomcat等设计组件及Linux体系结构的配合使用下．为用户提供了一个安全、高效、可扩展且访问灵活的数据库接入方式。     

一种楼宇无线自动抄表系统的设计

介绍了一种以无线方式实现自动抄表的数据采集系统，给出院 系统的总体设计，详细说明了主站，分站的工作原理以及主站和分站之间的通讯方式。     

Synthesis and properties of novel amphiphilic sulfated ionomers by the ring‐opening reaction of an epoxidized styrene–butadiene–styrene triblock copolymer

A method for the synthesis of novel sulfated ionomer of styrene–butadiene–styrene triblock copolymer (SBS) was developed. SBS was first epoxidized by performic acid in the presence of a phase‐transfer catalyst; this was followed by a ring‐opening reaction with an aqueous solution of alkali salt of bisulfate. The optimum conditions for the ring‐opening reaction of the epoxidized SBS with an aqueous solution of KHSO₄ were studied. During the ring‐opening reaction, both phase‐transfer catalyst and ring‐opening catalyst were necessary to enhance the conversion of epoxy groups to ionic groups. The products were characterized with Fourier transform infrared spectrophotometry and transmission electron microscopy (TEM). After the potassium ions of the ionomer were substituted with lead ions, the lead sulfated ionomer exhibited dark spots under TEM. Some properties of the sulfated ionomer were studied. With increasing ionic groups or ionic potential of the cations, the water absorbency and emulsifying volume of the ionomer and the intrinsic viscosity of the ionomer solution increased, whereas the oil absorbency decreased. The sulfated ionomer possessed excellent emulsifying properties compared with the sulfonated SBS ionomer. The sodium sulfated ionomers in the presence of 10% zinc stearate showed better mechanical properties than the original SBS. When the ionomer was blended with crystalline polypropylene, a synergistic effect occurred with respect to the tensile strength. The ionomer behaved as a compatibilizer for blending equal amounts of SBS and oil‐resistant chlorohydrin rubber. In the presence of 3% ionomer, the blend exhibited much better mechanical properties and solvent resistance than the blend without the ionomer. SEM photographs indicated improved compatibility between the two components of the blend in the presence of the ionomer. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008