基于利益相关者需求的城市交通枢纽设施优化设计研究

针对城市交通枢纽项目中设施管理只注重物业管理,设施运行管理与设施规划设计间缺乏信息传递而导致的设施规划设计不能充分体现枢纽运营需求的现实情况。文章以设施管理为理论基础,以枢纽运营管理为导稀,根据功能特点将枢纽设施类型进行区分,分析了不同类型设施的利益相关者需求,并将其价值需求形成设计指标,弥补了设施规划设计与设施运行管理间的信息缺失。     

基于射频技术的无线识别系统设计

本无线识别系统的设计利用射频技术,阅读器将呼叫信号加载到频率为70MHZ的射频上,以无线方式发给应答器。呼叫信号经过线圈耦合、解调、电压比较器等电路传送到应答器的控制器。控制器对呼叫信号进行分析、确认后,将存储的四位二进制编码通过发送端的调制电路馈送到阅读器,并显示应答器的具体信息。     

实时调度算法研究

对实时调度进行了讨论：研究了单处理器下的经典调度算法：单调速率调度、最早死线调度和最短空闲时间优先调度;分析了多处理器系统中的典型调度算法：对分布式系统中的两种调度算法：广义单调速率调度和分布式风车调度做了简要论述;指出实时调度研究策略方向。     

冲床二度落互补式监测方法

针对冲床单次冲压时曲柄过冲导致滑决二次落下的危险,在分析传统二度落监测方法局限的基础上,提出一种 凹凸互补式2个凸轮同时监测二度落信号的方法,设计了一种独立于冲床主控PLC的独立监测单元,结果表明该方法可 有效地提高冲床二度落信号判断的可靠性,降低冲床二度落信号漏检造成的危害。     

基于JIT配送的3PL运输协调调度问题建模与分析

近年来,随着第三方物流(Third Party Logistics,3PL)的日益成熟,其服务的专业性越来越高。相当数量的制造商们把产品的运输与配送外包给3PL以缩短订单处理的时间。本文研究Just-in-Time(JIT)背景下由3PL主导的供应链中3PL协调调度问题。3PL给出运输工具的出发、到达时间、可用的运载容量及相应的价格。制造商根据其生产调度和订单配送要求,有选择的使用3PL的运输资源,以最小的成本达JIT配送的目的。本文建立了该问题的数学模型,并证明了相应的计算复杂度。最后通过仿真实验验证计算复杂度。     

Surgical Suites' Operations Management

Surgical suites are a key driver of a hospital's costs, revenues, and utilization of postoperative resources such as beds. This article describes some commonly occurring operations management problems faced by the managers of surgical suites. For three of these problems, the article also provides preliminary models and possible solution approaches. Its goal is to identify open challenges to spur further research by the operations management community on an important class of problems that have not received adequate attention in the literature, despite their economic importance.     

Combinatorial Optimization in Real-Time Scheduling: Theory and Algorithms

Real-time computer systems are essential for many applications, such as robot control, avionics, medical instrumentation, manufacturing, etc. The correctness of the system depends on the temporal correctness as well as the functional correctness of the task executions. In order to assure temporal correctness it is necessary that the resources be scheduled to meet the temporal requirements of applications. When we consider the problem of nonpreemptive scheduling of a set of tasks in a processor for which no feasible solution exists, some tasks may have to be rejected so that a schedule can be generated for the rest. In this paper, we consider the problem of generating an optimal schedule such that the number of rejected tasks is minimized, and then the finish time is minimized for the accepted tasks. We propose to use an analytic approach to solve this problem. We first discuss the super sequence based technique which was originally proposed for reducing the search space in testing the feasibility of a task set. Then we show by the Conformation theorem that the super sequence constructed from the task set also provides a valid and reduced search space for the optimization problem. While the complexity of our scheduling algorithm in the worst case remains exponential, our simulation results show that the cost is reasonable for the average case.     

Sibling Socialization of Competence in Rural,Single‐Parent African American Families

Older siblings' contributions to younger siblings' competence net of parenting processes were examined with 152 pairs of first‐born (M= 11.7 years) and second‐born (M= 9.2 years) siblings in rural, single‐parent African American families. The possible moderational effect of sibling conflict on the association between older and younger siblings' competence was also examined. Mothers reported their parenting practices, teachers assessed siblings' competence, and older siblings reported sibling conflict levels. Structural equation modeling indicated that parenting was linked with older siblings' competence, which in turn was linked with competence among younger siblings. Hierarchical multiple regression revealed that older and younger siblings' competencies were linked when sibling relationships included low levels of conflict.     

Race Differences in Family Experience and Early Sexual Initiation: Dynamic Models of Family Structure and Family Change

We examine the effects of family structure on age at first sexual intercourse before marriage for a recent cohort of women. Previous research on the linkage between family structure and sexual initiation has employed relatively crude measures of family structure—typically a snapshot of the respondent's family structure at age 14. We use retrospective parent histories from the 1979–1987 National Longitudinal Survey of Youth to construct dynamic measures of family structure, using information on the number and types of parents in the respondent's household between birth and age 18. We use these measures in proportional hazard models to test the effects of prolonged exposure to a single‐mother family, prolonged absence of a biological father, parental presence during adolescence, and family turbulence. For White women, age‐specific rates of first sexual intercourse are significantly and positively associated with the number of family transitions; for Black women, age‐specific rates are significantly and positively associated with having resided in a mother‐only or father‐only family during adolescence. Net of other effects of family structure, we find no significant effects for White or Black women of being born out of wedlock, prolonged exposure to a single‐mother family, or prolonged absence of a biological father. Our results for White women are consistent with a turbulence hypothesis, whereas for Black women our results suggest the importance of family structure during adolescence. For neither White nor Black women are our results consistent with hypotheses positing earlier initiation of sexual activity for women with prolonged exposure to a single‐mother or father‐absent family.     

中小学独生子女同伴关系调查

文章通过对中小学独生子女同伴关系的调查研究,得出如下结论:第一,同伴交往中不受欢迎的独生子女占相当的比例;第二,小学阶段的独生子女与中学阶段的独生子女同伴关系的总体状况差不多,都是受欢迎的与不受欢迎的各占一成半左右,二者没有显著差异;第三,中小学独生子女同伴交往存在着明显的性别差异,女生的同伴关系明显好于男生;第四,在中学阶段,不受欢迎的农村独生子女明显多于城市独生子女;第五,中学阶段毕业班的独生子女受欢迎的明显比非毕业班的少,不受欢迎的与非毕业班没有显著差异,同伴关系一般的明显比非毕业班的多。