Research of neural network algorithm based on factor analysis and cluster analysis

Aiming at the large sample with high feature dimension, this paper proposes a back-propagation (BP) neural network algorithm based on factor analysis (FA) and cluster analysis (CA), which is combined with the principles of FA and CA, and the architecture of BP neural network. The new algorithm reduces the feature dimensionality of the initial data through FA to simplify the network architecture; then divides the samples into different sub-categories through CA, trains the network so as to improve the adaptability of the network. In application, it is first to classify the new samples, then using the corresponding network to predict. By an experiment, the new algorithm is significantly improved at the aspect of its prediction precision. In order to test and verify the validity of the new algorithm, we compare it with BP algorithms based on FA and CA.     

情感词典构建综述

文本情感分析是近年来迅速兴起的一个研究课题,具有显著的研究价值和应用价值。情感词典的构建在情感分析任务中发挥着越来越重要的影响力。该文对情感词典构建的研究进展进行了总结。首先重点介绍了情感词典构建的研究现状,将其归纳为四种方法,即基于启发式规则的方法、基于图的方法、基于词对齐模型的方法以及基于表示学习的方法,并对每种方法进行介绍和分析;然后对一些常见的语料库、词典资源以及评测组织进行介绍;最后,对情感词典的构建进行了总结,并对发展趋势进行了展望。
     

基于改进遗传模拟退火算法的WSN路径优化

针对无线传感器网络路径优化问题,提出了一种改进的最优保存的遗传模拟退火算法。利用LEACH算法构建初始路由表,使用GASA的高效率搜索,将路由计算和遗传演化计算同时进行,并直至寻找到近似最优路径为止。将最优保存遗传算法和模拟退火算法相结合,引入自适应的概率变化,有效地解决了这两种算法的早熟现象和时间问题。仿真实验表明,该算法有效地解决了无线传感器路径优化问题,具有定位准确、节能和搜索能力较强等优点。     

智能化决策支持系统框架的研究与设计

主要在对智能化决策支持系统( IDSS)进行研究并分析目前研究成果的基础上,根据IDSS的开发过程和特点,融合Web开发的MVC设计模式的思想,采用专家系统(ES)、数据仓库(DW)、联机分析处理(OLAP)和数据挖掘( DM)等技术,提出一种综合IDSS的结构框架,将其划分为4个层次,并对各个层次的作用分别进行说明.     

莱钢2号连铸机及热送热装的改造

分析了连铸机改造前和高效改造后新老系统在控制上的特点 ,着重介绍了改造后控制系统硬件和软件特点 ,该系统投运后不仅解决了本连铸机的自动控制 ,而且完成了连铸 热送 轧钢生产线的顺利贯通。     

面向功率键合图的通用仿真软件的研究大连铁道学院

本文介绍了一种面向功率键合图的通用的系统动态特性仿真软件-PBGSIM.该软件在MATLAB平台上二次开发而成,充分发挥了功率键合图法在分析系统动态特性方面的优势,可以处理包含各种环节的复杂系统.软件从系统的键合图模型出发,自动辨错提示、自动建立数学模型(字符型和数值型)、进行仿真计算并按要求输出仿真结果.用户可以方便地修改元件参数或模型直至得到满意的结果.还可以给定优化变量,对系统的动态特性进行参数优化.该软件的研制为采用键合图建模仿真提供了全新的手段,为复杂系统的动态设计、优化提供了一个有效的工具.     

生活形态研究与设计艺术关系的辨析

随着产品设计越来越关注固定人群的生活方式,反映和满足特定人群的特定需求的产品在设计领域逐渐凸显出来。把握生活形态研究和设计艺术两者的关系,让产品更加趋于特定人群的需求。从而使产品在使用的过程中激发人们的联想,产生共鸣。     

Inorganic fractions in extracellular polymeric substance extracted from activated sludge and biofilm samples by different methods

This study highlighted the inorganic fractions in the extracellular polymeric substance (EPS) extract from two activated sludges and one biofilm. Nine EPS extraction methods (centrifugation, sonication, cation exchange resin (CER) + sonication, CER, heating, formaldehyde + heating, formaldehyde + NaOH, ethanol and EDTA) were used in the study. The EPS extracts had large inorganic fractions, which ranged from 28% to 94% of the EPS dry weight. The EPS inorganic fraction was dependent on the source of the sludge and wastewater, the kinds of bacteria and the extraction method. The EPS extracts obtained by heating and sonication had smaller inorganic fractions than those obtained by centrifugation. The compositions of the inorganic fraction of EPS extracts obtained with CER and sonication + CER showed similar trends. The chemical extraction methods could contaminate the inorganic composition of EPS extracts by impurities, carrying over of the extractant itself or by changing the pH of the solution. Ethanol was the most effective extractant for obtaining inorganic ions.     

Numerical simulation of transport phenomena in continuous casting of steel plates with electromagnetic brake

The present work numerically investigates two-dimensional (2-D) solidification transport phenomena (EM-STP) during continuous casting (CC) process in the absence and the presence of static magnetic fields (SMFs), based on a unified numerical model. For the purpose of controlling vortexes, the electromagnetic brake (EMBR) effects of various SMFs under the given depth of submerged entry nozzle (SEN) and the same casting velocity V0 are investigated. ANSYS software is used to analyze the SMFs that applied to the EMCC process, and then a data-conversion program based on the principle of linear interpolation proposed previously is used to deal with the issue of data-format-matching between FEM and FVM. The simulation results indicate that, an appropriate SMF can effectively suppress the bulk liquid flow in CC-process of steel plate, and with increase of the intensity of applied magnetic fields, the vortexes become weaker and the oscillating amplitude of impinging jet decreases. Based on the knowledge gained from the EMCC-STP analysis and by comparing the results with the applied magnetic fields with those without magnetic fields, it is found that a SMF with |Bmax|=55×10-3 T can meet the need of braking, and consequently improve the quality of casting by reducing the penetration of non-metallic inclusions, as well as avoiding breakout, macro-segregation and crack ultimately.     

二茂铁功能化石墨烯复合材料的制备及其电催化多巴胺性质研究

利用氧化石墨烯片边缘的羧基和表面的环氧基团共价修饰的方法制备了二茂铁功能化石墨烯的复合材料,通过FT-IR、TEM等测试方法对复合材料的结构和形貌进行了表征,二茂铁共价修饰石墨烯复合材料呈现出了良好的稳定性。我们进一步利用二茂铁功能化石墨烯修饰电极对多巴胺电化学催化性质进行研究,该修饰电极对多巴胺显示出良好的催化活性,并推测出可能的催化反应机理,当信噪比为3时,检测限达到0.01μM。