自动化立体仓库中的储位分配及存取路径优化

储位分配和存取作业路径优化是仓储管理中的两个重要决策问题。本文研究如何在自动化立体仓库中对这两个问题进行同时决策。提出了一个混合整数规划模型对该问题进行优化建模,设计开发了一个基于有向连接图的两阶段优化算法对问题求初始解,并利用禁忌搜索算法对所求得的解进行改进。算法第一阶段解决储位分配问题,在此基础上第二阶段利用Hungarian算法对堆垛机的存取作业路径优化问题进行求解。最后利用实例对算法效率和精度进行分析评价,计算结果验证了算法的有效性。     

Minimizing the expected time to detect a randomly located lost target using 3-dimensional search technique

Abstract

This paper considers a new model in search theory to find a randomly located target in the 3-dimensional space. An approximation algorithm that facilitates searching procedures for searchers or robots is presented. The expected time to detect the target is also proved. The statistical analysis by calculating the optimal search strategy which minimizes the time to detect the target, assuming trivariate standard normal distribution is provided, and the technique by flowcharts is designed as well. The effectiveness of this strategy is illustrated by introducing an application from real world.     

Networks,case managers,and the job-search experiences of unemployed people

Employment services are commonly provided in network settings, but it is rare to find social policy analyses of how unemployed people search for jobs through networks. In a germinal analysis of social networks and employment, Mark Granovetter argued that “weak ties” (less familiar contacts) are more important to finding employment than are “strong ties” (family and friends). This is because weak ties provide more novel job-relevant information. Scholarship since Granovetter has predominantly supported the opposite argument, namely, that strong ties are more important for the unemployed, because they are more plentiful and thus provide more information in aggregate. Findings are also generally coloured by the focus being on “informal” networks or personal contacts. “Formal” networks, as represented most cogently by employment service providers, are absent or underestimated in most social network studies. On the basis of a qualitative study of 80 long-term unemployed people in Australia, incorporating analysis of both informal and formal networks, we argue that although “strong informal” ties are vital to job search, it is also important to consider “weak formal” ties, which can be complementary if and where service organizations are able to supply positive case management experiences.     

医学期刊三线表设计中常见问题例释

三线表在科技期刊中得到普遍应用,主要就医学期刊三线表设计中存在的几个常见问题举例、分析和修正,旨在提高三线表表格设计的科学性,使表格具有可读性和准确性,从而进一步提高期刊质量。     

On two random search problems

The paper is concerned with static search on a finite set. An unknown subset of cardinality k of the finite set is to be found by testing its subsets. We investigate two problems: in the first, the number of common elements of the tested and the unknown subset is given; in the second, only the information whether the tested and the unknown subset are disjoint or not is given. Both problems correspond to problems on false coins. If the unknown subset is taken from the family of k-element sets with uniform distribution, we determine the minimum of the lengths of the strategies that find the unknown element with small error probability. The strategies are constructed by probabilistic means.     

多媒体信息查询系统的设计与实现

介绍了一个自行研制的微机多媒体信息查询系统的设计方法及实现此系统的过程，讨论了系统的设计环境、系统功能结构及实现的关键技术。     

科技查新质量保障体系的构建与控制

分析了影响科技查新质量的关键因素及构建查新质量保障体系的主体结构,论述了查新机构确保查新质量的策略与方法。探讨了构成科技查新质量保障体系的如下主要组成要素:合理的业务流程、科学的管理系统、高素质的查新人员、丰富的查新资源、内容规范及文献对比分析准确且查新结论客观公正的查新报告、完善的专家审核制度及健全的档案管理制度等。     

农业科技专家大院科技推广模式的探索

农业科技专家大院是农业科技体制改革的重要尝试,促进了大学产学研的紧密结合,有效的实现了科技与农民的对接,建立了农业科技进村入户的新通道,实现了科技与“三农”的对接,促进了地方主导产业发展,提高了农民科技文化素质,指导扶持了涉农企业,引导培育了农村经济合作组织,是当前我国农村科技兴农的一种创新模式。     

流分类技术的研究

介绍了流分类算法的概念以及对流分类算法的要求;把目前存在的流分类算法分成三类:多维查找转换为一维查找算法、相关区域查找算法、独立区域查找算法,并对各类算法的性能进行了讨论;通过引入并行流分类算法说明了流分类算法的研究重点是减小存储空间和提高更新速度。     

湖北省民营科技企业发展对策研究

本文结合近三年的湖北省民营科技企业的有关统计资料和有关调查,简述了湖北省发展民营科技企业一些存在的问题,提出了加快发展湖北省民营科技企业的对策和建议。