用木桶原理改进最大流算法

传统求网络最大流算法需要反复将网络图进行标号和增流,存在步骤繁复、计算量大的问题。本文提出了一种寻找最大流的改进标号法。此方法通过寻找网络中可能的最小割进行标号、分配流量,可以简化计算过程,提高运算效率。     

整流柜均流系数测算方法的改进

传统的整流柜均流系数测算需要工作人员在正常运行或电流升高的整流柜上测量快熔两端的毫伏压降,这对测试人员和整流柜来说都存在较高的危险。使用红外线测温仪可以随时检查每条桥臂上整流元件和快熔的运行情况,套用计算均流系数的公式可以计算桥臂的温度系数,跟踪桥臂的均流变化情况,比传统的方法更安全、简便。     

一个流精益生产管控系统在石钢的应用

石钢围绕打造具有特钢精益生产管理新模式的目标,创新突破,以生产、能源、物流三流集中管控为基础,按照一个流的精益生产管理理念,从原料进厂到成品出厂,完善构建数据平台,积极构建七大平衡管控体系,确保计划执行率;实现了均衡稳定、连续流畅、紧凑高效的精益生产管理模式,提高企业的综合竞争力.     

升流膨胀式中和滤池的改进

文章阐述了升流膨胀式中和滤池的原理 ,针对金昌冶炼厂升流膨胀式滤池在处理酸性废水中存在的问题 ,着重从工艺、设备、自动控制和操作等方面提出改进措施     

冶金企业生产计划的最大利润流算法

以节点表示原料、在制品或成品,以弧表示工序,运用网络流描述冶金企业生产流程,将冶金企业生产计划的优化问题转化为共享资源的最大利润流问题。提出了生产计划的网络优化算法,进行了复杂性分析,并给出一个计算实例。该算法的计算结果与单纯形法的结果完全相同,但求解过程较后者简洁。     

基于改进最大流最小割算法的露天境界优化及应用

最终境界对露天矿开采效益至关重要,而求解速度慢且结果不准确是最大流最小割算法在露天矿境界优化中的一个固有缺陷。对已有最大流最小割算法进行改进,以净现值（NPV）最大为目标,首先以最大几何境界内的价值块构造有向网络图,通过聚合网络图节点减少弧的复杂度,并在残留网络中对负价值节点增加开采约束,以保证得到的最小割集中正价值块受到负价值块的约束,最终通过C++编程实现该算法对露天矿进行境界优化。经实例验证,该方法科学可行,克服了原算法求解速度慢且结果不准确的弊端,且求解效率提高了近600 s,该算法具有理论上的优越性和实用性。     

基于国产密码算法的物联网安全体系架构研究

正针对物联网安全系统架构进行研究,提出一种物联网基于国产密码算法(SM2/SM3/SM4)协议,在TLS1.1的握手协议中增加了SM2、IBC的认证模式和密钥交换模式,取消了DH密钥协商方式,修改了密码套件的定义。同时,提出一种物联网密钥管理系统,但需要根据原协议规范的可扩展性对原协议进行分析和实验。     

速度对AuNi9/AuAg35Cu5载流摩擦磨损行为的影响

针对空间电接触材料应用速度提升的需求,研究滑动速度对AuNi9/AuAg35Cu5摩擦副载流摩擦磨损行为的影响规律.结果表明:滑动速度从56.5 mm/s提高至194.2 mm/s时,摩擦副的摩擦因数和接触压降均值分别从1.1和71.8 mV上升至2.0和132.8 mV,接触压降的均方根(RMS)从0.16 mV增至...     

基于改进差分进化算法的加热炉调度方法

提出一种以燃料消耗量最小为优化目标的加热炉生产调度新方法。首先基于热力学第一定律分析了流入及流出加热炉的各项能量,并对燃料消耗量的计算式进行了理论推导。进而根据加热炉区实际生产调度特点归纳各约束条件,以多台加热炉总燃料消耗量最小为优化目标,构建调度优化数学模型。采用自适应差分进化算法搭配禁忌搜索算法进行综合求解,并通过9组实际钢坯生产案例模拟验证了该算法的可行性和有效性。同时,为了探究加热炉燃料消耗量的影响因素,提出了分别衡量加热炉区缓冲等待、炉内加热两部分时间同理想生产时间匹配程度的评价参数μ₁和μ₂,并分析了燃料消耗量对二者的敏感性,结果表明:当连铸坯到达加热炉节奏与热轧工序出坯节奏之比由0.5增至2时,燃料消耗量对两评价参数的敏感性逐渐减弱。      

铜带20辊冷轧机除油装置的改进与实践

介绍了铜带20辊冷轧机除油装置结构及存在的缺陷.通过技术改造后,带材表面残油减少,轧制速度提高到300~400 m/min,生产效率提高,带材合格率达98%,取得了良好的效果.     

Cipher versus cue reading: An experiment in decoding acquisition.

Phonetic-cue reading involves reading words by storing and retrieving associations between some of the letters in spellings and sounds in pronunciations. Cipher reading involves processing all of the letter–sound relations in spellings. These two types of reading were compared experimentally. Novice beginning readers in kindergarten were assigned either to a group that was taught to decode—the cipher readers—or to a group that practiced isolated letter–sound relations—–the phonetic-cue readers. On posttests, cipher readers learned to read 15 similarly spelled words almost perfectly, whereas cue readers learned less than half of the words. Cipher readers also spelled better than cue readers. Errors indicated that cue readers were processing partial letter-sound cues in words. Results indicated that phonetic-cue reading is another way besides visual memory and decoding to read words. Results documented the importance of beginning readers' advancing beyond cue reading to cipher reading. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

成本责任流管理模式探索

成本管理粗放一直是困扰我国企业的重要问题,非系统化的管理模式、不健全的责任管理及其激励机制、人工化的支持手段是阻碍解决上述问题的症结。结合我国企业实际,加强成本与责任之间、责任与作业单元之间关系的管理与控制,从而支持动态成本控制,实现粗放管理向集约管理转化。提出了成本责任流及其管理模式,这一模式作为与物流、资金流、信息流和工作流并重的集成动态管理手段,是解决企业成本管理粗放问题的有效手段。     

Aquifer Diffusivity and Stream Resistance from Varying Stream Stage

An efficient method that uses discrete ramp kernel is proposed for obtaining the piezometric head in an aquifer due to an arbitrary variation in stream stage considering stream resistance. The method assumes straight line variation between two consecutive points in representing the arbitrary stream stage variation. Expression for the ramp kernel is derived for homogeneous and isotropic aquifer conditions. Using the method, the stream resistance and hydraulic diffusivity of the aquifer are estimated for a set of published data. It is observed that the hydraulic diffusivity should be estimated along with the stream resistance for a better estimation of aquifer diffusivity.     

An Improved Particle Swarm Optimization for Feature Selection

Particle Swarm Optimization (PSO) is a popular and bionic algorithm based on the social behavior associated with bird flocking for optimization problems. To maintain the diversity of swarms, a few studies of multi-swarm strategy have been reported. However, the competition among swarms, reservation or destruction of a swarm, has not been considered further. In this paper, we formulate four rules by introducing the mechanism for survival of the fittest, which simulates the competition among the swarms. Based on the mechanism, we design a modified Multi-Swarm PSO (MSPSO) to solve discrete problems,which consists of a number of sub-swarms and a multi-swarm scheduler that can monitor and control each sub-swarm using the rules. To further settle the feature selection problems, we propose an Improved Feature Selection (IFS) method by integrating MSPSO, Support Vector Machines (SVM) with F-score method. The IFS method aims to achieve higher generalization capability through performing kernel parameter optimization and feature selection simultaneously. The performance of the proposed method is compared with that of the standard PSO based, Genetic Algorithm (GA) based and the grid search based methods on 10 benchmark datasets, taken from UCI machine learning and StatLog databases. The numerical results and statistical analysis show that the proposed IFS method performs significantly better than the other three methods in terms of prediction accuracy with smaller subset of features.     

一种改进的MIMO系统串行干扰消除检测算法

使用串行干扰消除(SIC)方法进行MIMO系统信号检测时,先检测出的信号对后续层信号的检测有很大影响,存在误差传播现象.针对这一问题,提出一种改进的SIC检测算法.所提算法在进行SIC检测时,对前层采用穷举搜索,并对所得到的P维信号的累积度量值进行计算和排序,从中取出L组具有最小度量值的信号,再对其后续层利用SIC进行检测.由于对前P层进行穷举搜索,降低了检测的误码率,从而减少了误差传播,提高了系统的检测性能.通过调节参数P和L,可以在计算复杂度和检测性能间取得适当的折中.     

Stream Multiaquifer Well Interactions

In this paper, unsteady flow into a multiaquifer well due to stream stage changes and varying pumping rate is analyzed. The well is located at such a distance that the radius of influence touches the stream boundary; hence, pumping induces seepage from the stream to the aquifer. The discrete kernel approach, which is based on Duhamel’s principle, has been applied to find the interaction among stream, aquifers, and pumping well for constant as well as varying stream stage. The analytical expression for a damped sinusoidal flood wave passing in a fully penetrating stream has been used for obtaining the aquifer response. By applying image-well theory, the finite aquifer and well system has been transformed into an infinite aquifer and well system. The principle of superposition, which is applicable to a linear system, has been used to analyze the interaction processes among the three components of the system. The interaction of the stream, aquifers, and well with each other are analyzed during pumping, after stoppage of pumping, as well as during passage of a flood wave in the stream.     

Design for Stream Restoration

Stream restoration, or more properly rehabilitation, is the return of a degraded stream ecosystem to a close approximation of its remaining natural potential. Many types of practices (dam removal, levee breaching, modified flow control, vegetative methods for streambank erosion control, etc.) are useful, but this paper focuses on channel reconstruction. A tension exists between restoring natural fluvial processes and ensuring stability of the completed project. Sedimentation analyses are a key aspect of design since many projects fail due to erosion or sedimentation. Existing design approaches range from relatively simple ones based on stream classification and regional hydraulic geometry relations to more complex two- and three-dimensional numerical models. Herein an intermediate approach featuring application of hydraulic engineering tools for assessment of watershed geomorphology, channel-forming discharge analysis, and hydraulic analysis in the form of one-dimensional flow and sediment transport computations is described.     

Distribution of Stream Depletion

In this paper, we consider Hunt’s stream depletion model, which models the effect of pumping adjacent to an infinitely long stream. In this model it is assumed that drawdown is described by an extension of the Theis equation. We derive a formula for the distribution of stream depletion and comment on the use of this formula in pump test design.