A modified Min Sum decoding algorithm based on LMMSE for LDPC codes

A new modified Min Sum decoding algorithm based on parameter estimation theory for Low Density Parity Check (LDPC) codes is presented in this paper. First, Linear Minimum Mean Square Error (LMMSE) estimate criterion is used to model the magnitude of check-to-variable message and calculate estimated parameters, furthermore the golden section search algorithm is used to speed up getting the boundary, with which the parameters can be determined. Then, the parameters are modified further on the basis of the relationship between the iteration number and the estimated parameters. Finally, the same estimated parameters are used for different signal to noise ratio (SNR) to ensure the decoding performance and reduce the hardware complexity. The simulation results show that a gain of 0.3–0.5 dB can be achieved in comparison with other kinds of modified Min Sum algorithms, which is very close to that of BP algorithm. What's more, the algorithm has the following characteristics: low computation complexity, small decoding delay, easiness of calculation for estimated parameters, and simplicity in hardware implementation.     

多项目管理在GE奥运项目中的应用

随着经济和社会的发展，企业面临许多新的管理问题，而多项目管理正是企业和企业管理发展的现实需求。探讨了多项目管理的含义，分析了其在GE奥运项目中的应用，肯定了以GE奥林匹克业务部为核心的多项目管理模式的成功之处。     

GE水煤浆气化工艺改进探讨

以工艺包为基础,讨论了GE水煤浆气化工艺改进措施,主要包括:气化炉增加专用氮气缓冲罐;激冷水系统采用两个独立的变频泵代替流量调节阀;煤浆输送系统增加煤浆转移泵;高压闪蒸系统增加一条旁路和1台闪蒸分离器;增加气化炉的开工黑水排放至碳洗塔的管线;除氧器放空系统增加回收装置等。同时探讨了这些改进措施对工艺的影响,以供相关厂家参考。     

棒材生产线自动控制系统改造设计

针对棒材高速连轧生产线上现有控制系统存在的2#飞剪不能及时碎断轧件的问题进行改造设计.为了避免浪费,各子系统仍使用原有PLC.在通讯方面,采用软件编程与硬件连线相结合的方法,即利用PLC软件编程实现各种故障信号的采集,并通过Ethernet在同型号PLC之间进行传递,而不同型号的PLC之间则采用电缆连接方式,以保持原有系统的稳定性.实践表明,改造后的控制系统丰富了2#飞剪的控制功能,提高了2#飞剪的反应速度,降低了停车处理时间,取得了显著的经济效益.该改造思路同样适用于其他类似生产过程的改造.     

福州闽江——乌龙江岸线变化及稳定性分析

采用福州市2000年、2004年、2009年有代表性的卫星影像图进行对比,分析其岸线的变化情况。结合定性与定量分析将岸坡稳定性程度划分为四个等级,将闽江-乌龙江岸坡稳定性进行分段分级,对影响闽江-乌龙江岸坡稳定性的地质因素、水动力条件及人为因素进行了探讨,最后提出了若干岸坡治理的有效措施。     

A hybrid intelligent system for medical data classification

In this paper, a hybrid intelligent system that consists of the Fuzzy Min–Max neural network, the Classification and Regression Tree, and the Random Forest model is proposed, and its efficacy as a decision support tool for medical data classification is examined. The hybrid intelligent system aims to exploit the advantages of the constituent models and, at the same time, alleviate their limitations. It is able to learn incrementally from data samples (owing to Fuzzy Min–Max neural network), explain its predicted outputs (owing to the Classification and Regression Tree), and achieve high classification performances (owing to Random Forest). To evaluate the effectiveness of the hybrid intelligent system, three benchmark medical data sets, viz., Breast Cancer Wisconsin, Pima Indians Diabetes, and Liver Disorders from the UCI Repository of Machine Learning, are used for evaluation. A number of useful performance metrics in medical applications which include accuracy, sensitivity, specificity, as well as the area under the Receiver Operating Characteristic curve are computed. The results are analyzed and compared with those from other methods published in the literature. The experimental outcomes positively demonstrate that the hybrid intelligent system is effective in undertaking medical data classification tasks. More importantly, the hybrid intelligent system not only is able to produce good results but also to elucidate its knowledge base with a decision tree. As a result, domain users (i.e., medical practitioners) are able to comprehend the prediction given by the hybrid intelligent system; hence accepting its role as a useful medical decision support tool.     

溪源泄洪洞出口处闽江设计水位分析研究

溪源泄洪洞出口位于闽江之上,为分析泄洪洞出口处的设计水位,采用设计流量和水位流量关系推求法及实测水位资料推求法两种方法对工程设计水位进行计算,经过合理性分析,工程所在地近年水位变化剧烈,采用设计流量和水位流量关系推求法更符合现状情况,为工程建设提供可靠的设计成果。     

基于FAHP和GE矩阵的制造型企业新产品选择研究

针对制造型企业战略转型时期选择新产品决策问题,从战略角度出发提出运用FAHP和GE矩阵相结合的方法对新产品进行综合评价和投资优先顺序定位。此方法将产品的评价指标按照GE矩阵的两个维度进行分类,分析了产品的行业吸引力和企业生产该产品的相对竞争力,并进行指标层次细分,使指标更加贴近生产实际。指标权重设置更加清晰准确,同时更能体现产品结构和企业战略的统一性。     

基于GE智能控制平台的太阳能跟踪控制系统设计

为了提高对太阳能的利用率,提出了一种基于GE智能平台的太阳能跟踪系统的设计与实现方案。该方案采用Genius总线网络结构,以Rx3i作为核心控制器,以步进电机作为执行机构,采用视日运动轨迹跟踪和光电跟踪相结合的方式实现对太阳的方位和俯仰角的双轴自动跟踪。实验测试结果表明,该系统实现了对太阳光照的实时自动跟踪,系统运行可靠、稳定,达到了提高太阳能发电利用率的目的。     

Systolic arrays for group explicit methods for solving first order hyperbolic equations

In this paper, systolic techniques for the simulation of the Group Explicitmethod for parabolic equations by systolic array data structures using the Soft Systolic algorithm paradigm have been extended to include hyperbolic equations of first order. In particular, the Group Explicit Complete (GEC) strategy can be used as generic array construction for other simple schemes and for comput ations on large intervals. The easy form of the finite difference approximation to the hyperbolic equation res ults in a simpler and hence faster and more area efficient basic cell.