模块化细胞生产系统研究

运用模块化理论分析了细胞生产方式中的细胞所具有的模块特征,进而对模块化细胞生产系统的演变过程、运作机理进行了探讨。在此基础上,从结构、细胞、工人、流程再造等四方面指出了构建模块化细胞生产系统所给予我们的一些重要启示。     

Modelling the dependence between the times to international adoption of two related technologies

The structure of the dependence between the times to adoption by a country of two related innovations, the fax and the cellular telephone, is modelled in two stages. The first stage is the choice of density function for the time to adoption. The second stage is describing the dependence relation. For the first stage, a Weibull density function is used with its scale factor adapted to account for the economic and technological environments in different countries. Environmental data are collected from several sources. Copulas are used to model the dependence relation, three single parameter copulas are considered, those due to Farlie-Gumbel-Morgenstern (FGM), Frank and Plackett. Their properties are described and a combined estimation of the copula and density function parameters carried out. The limitations of the FGM copula rule it out from further consideration. The other copulas coupled with the Weibull, using eight environmental variables, are shown to provide valuable insights into the effects of environmental variables on adoption times. Given that a country has adopted one technology, the model of the dependence relation is used to provide the conditional density of the time to adoption of the other technology.     

Equivalence results in chi-square tests

This paper shows that two versions of the chi-square test statistics are equivalent, whether it is constructed from the entire cells in a partition of the support or one less cells. This equivalence holds not only asymptotically but also for each sample realization.     

Growing and reproducing particles evolving through space and time

In this paper we develop a spatially explicit marked point process model to generate spatial patterns of reproducing and moving cells evolving through continuous time. In this context, marked points (i.e. cells) can divide and move as a result of (a) their own growth and division motions, and (b) the division motions and the growth of their touching neighbours. To illustrate such dynamics we present several simulated examples. Our results suggest that by replacing the mathematically convenient growth and interaction functions by others more suited to mimic realistic cell reproduction dynamics, this model may provide a modelling framework to simulate cell aggregate (i.e. tissue) dynamics. Moreover, adding movement to dividing and growing points opens up new areas of application as well as new theoretical problems such as the analysis and generation of dense packing of discs (or spheres). Work partially funded by grant MTM2004-06231 from the Spanish Ministry of Science and Education.     

Beyond 3G移动通信系统的小区搜索算法

本文给出了一种可用于Beyond3G的帧结构,利用在物理帧中添加单载波调制的同步信道的方法来实现快速小区搜索。小区搜索过程主要包括时隙同步、帧同步和小区识别过程。本文通过对小区搜索算法的检测概率和虚警概率进行分析,推导出小区搜索的平均搜索时间来分析设计方案的性能。最后,通过在IMT-2000modelA信道环境下对小区搜索算法的性能进行仿真,验证了设计方案的正确性。     

Cell生产方式在电视机生产中的应用

单元式(Cell)生产作为一种与传统流水线式生产截然不同的生产组织模式,在应对多品种、小批量、短交期的订单方面有着独特的作用。它基于精益生产的原则,进行灵活布局,由单个工人进行多任务操作,进行单件制造,消除传统流水线中存在的等待、搬运、WIP等浪费,提高生产效率。本研究中,通过在电视机生产中引入Cell生产模式,以满足多品种小批量订单需求。     

用于脉冲多普勒雷达的高速数字自动增益控制(DAGC)系统

本文从ＡＧＣ的本质入手，避开复杂的数学计算，提出了一种新的地址指针查表式的ＤＡＧＣ系统，介绍了该系统的工作原理及工作流程。     

用于直接甲醇燃料电极的阳极催化剂研究

为了提高直接甲醇燃料电池阳极催化活性,本文研究了三种过渡金属取代磷钼酸修饰铂电极在硫酸溶液中的电化学行为及对甲醇的电催化氧化作用,并利用一氧化碳吸附实验评价了三种过渡金属取代磷钼酸修饰铂电极的抗一氧化碳毒化性能。结果表明,三种过渡金属取代磷钼酸修饰铂电极均能够提高铂电极的催化活性,其中PMnMo11修饰铂电极对甲醇的催化活性最高,同时铂电极经三种过渡金属取代磷钼酸修饰后抗一氧化碳毒化能力增强。     

A hybrid heuristic algorithm adopting both Boltzmann function and mutation operator for manufacturing cell formation problems

This study proposes a hybrid heuristic algorithm employing both the Boltzmann function from simulated annealing and the mutation operator from the genetic algorithm to explore the unvisited solution region and expedite the solution searching process for the cell formation problem, so that grouping efficacy is maximized. Test problems drawn from the literature are used to test the performance of the proposed heuristic algorithm. The comparative study shows that the proposed algorithm improves the best results found in the literature for 36% of the test problems in the case when singletons solutions are allowed.     

大蒜溶液对小鼠小肠黏膜结构、上皮内淋巴细胞和杯状细胞的影响

用组织学和组织化学方法研究不同浓度的大蒜素溶液对小鼠小肠黏膜结构及部分黏膜免疫相关细胞分布与数量的影响。试验选用8周龄BALB／C雄鼠50只,分为5组,每组10只,每组分别饲喂5种不同浓度的大蒜素溶液,每天80ml,实验期为10天。结果显示,1％大蒜素溶液对小鼠小肠肠绒毛长度、V／C比值、黏膜厚度,黏膜免疫相关细胞数量影响最大,对改善和增强小鼠小肠的消化吸收功能,提高肠道的防御能力效果最佳。