Order Consolidation for Batch Processing

We consider the batch processing of orders where either whole or part of a single order or a specific pair of different orders may be grouped in a batch with a fixed capacity. The problem can be modelled by a graph G = (V,E), where each node v V corresponds to an order, its weight w(v) corresponds to the amount of ordered quantity and a pair of orders, say u and v may be grouped in a batch if there exists the edge (u,v) E. The objective is to maximize the number of batches filled up to its capacity . In this paper, we prove that the problem is NP-hard and, moreover, that no PTAS exists unless P = NP. Then, an optimal algorithm is developed with running time O(|V|log |V|) for the special case when G is a tree.     

Ka频段宽带落入式微带结型隔离器

从理论上指出原型落入式微带结型环行器（或隔离器）性能不佳的原因在于第二环行条件不满足，提出通过调整中心结的高度和匹配段长度可以改善阻抗匹配状况，提高器件的性能。据此制作了一个Ｋａ频段落入式微带隔离器，在２．０ＧＨｚ绝对带宽内（３０．５ＧＨｚ～３２．５ＧＨｚ）器件的插损小于１．０ｄＢ，隔离大于２０ｄＢ     

XBPQC—F75FF型压力流量补偿负荷传感轴向柱塞泵的试验与研究

压力流量补偿负荷传感轴向柱塞泵是组成功率匹配液压系统的核心元件,它自身的静动态特性直接影响功率匹配液压系统的工作性能。本文通过对该泵的理论分析与试验研究,指出了影响该泵性能的主要因素,从而为改善系统的性能提供了有益的依据。     

天线调谐器反Г形阻抗匹配网络适配

介绍天线调谐器反Г形阻抗匹配网络的结构形式和匹配区域;分析反Г形网络各参数取不同值时对HF双极天线的适配性,给出参数变化随频率、VSWR门限变化时对HF双极天线输入阻抗的适配曲线,为设计天线调谐器阻抗匹配网络和决定天线调谐器适配天线类型提供参考.     

天线调谐器反Г形阻抗匹配网络适配HF双极天线分析

介绍天线调谐器反Г形阻抗匹配网络的结构形式和匹配区域;分析反Г形网络各参数取不同值时对HF双极天线的适配性,给出参数变化随频率、VSWR门限变化时对HF双极天线输入阻抗的适配曲线,为设计天线调谐器阻抗匹配网络和决定天线调谐器适配天线类型提供参考.     

Estimating the effects of Head Start on parenting and child maltreatment

We examine the effects of Head Start participation on parenting and child maltreatment in a large and diverse sample of low-income families in large U.S. cities (N = 2807), using rich data from the Fragile Families and Child Wellbeing Study (FFCWS). To address the issue of selection bias, we employ several analytic approaches, including logistic regressions with a rich set of pretreatment controls as well as propensity score matching models, comparing the effects of Head Start to any other arrangements as well as specific types of other arrangements. We find that compared to children who did not attend Head Start, children who did attend Head Start are less likely to have low access to learning materials and less likely to experience spanking by their parents at age five. Moreover, we find that the effects of Head Start vary depending on the specific types of other child care arrangements to which they are compared, with the most consistently beneficial protective effects seen when Head Start is compared to being home in exclusively parental care.     

支持向量机在人岗匹配度测算中的应用

在某市住房公积金管理中心的人力资源配置过程中,通过实例研究发现,采用支持向量机的人岗匹配度测算模型相对于BP人工神经网络等其他常规模型匹配精度更高,在样本数量较少的情况下其优越性更加突出。组织在采用支持向量机模型和模糊综合评价法进行人岗匹配度评价时,先应通过科学的工作分析,建立合适的测算指标体系,然后构建岗位匹配度矩阵和岗位候选人模糊矩阵,最后运用最小二乘支持向量机测算匹配度。     

基于知识特征的企业研发伙伴选择

基于知识特征的企业研发伙伴选择研究有助于提高企业与其合作伙伴的知识匹配性,关系到企业间合作研发的知识创新能力。结合企业知识理论,指出知识特征是企业选择合作伙伴以实现研发中知识创新能力提高的主要影响因素。运用层次分析法,构建基于知识特征的企业研发伙伴选择指标体系,确定指标权值,并以3个待选择企业作为实例进行分析,旨在为企业研发伙伴选择提供思路指导和方法借鉴。     

辽宁装备制造业物流体系规划研究

物流体系的有效规划可以提高物流的运行效率和水平,使其更好地为装备制造业服务。在分析辽宁装备制造业与物流业供需匹配情况的基础上,确定辽宁装备制造业物流体系的功能定位,据此建立功能结构模型,并根据该模型设计辽宁装备制造业物流体系的框架结构,包括战略目标体系、物流设施空间布局体系、物流信息网络体系、物流标准化体系、物流技术装备保障体系以及物流政策与组织运作体系,以期为辽宁装备制造业物流体系规划提供参考。     

金融机构信贷资金期限匹配问题研究:以西部地区为例

存款活期化、贷款中长期化并存的信贷资金期限配置现象,已成为经济金融运行中重点关注的问题。从经济主体利润最大化、经济结构、历史政策因素、融资体制制约、金融统计指标等多角度,诠释了西部地区金融机构信贷资金期限相匹配的客观性和合理性,提出西部金融机构可持续发展的政策建议。