Exact confidence regions for species assignment based on DNA markers

Assignment of individuals to correct species or population of origin based on a comparison of allele profiles has in recent years become more accurate due to improvements in DNA marker technology. A method of assessing the error in such assignment problems is présentés. The method is based on the exact hypergeometric distributions of contingency tables conditioned on marginal totals. The result is a confidence region of fixed confidence level. This confidence level is calculable exactly in principle, and estimable very accurately by simulation, without knowledge of the true population allele frequencies. Various properties of these techniques are examined through application to several examples of actual DNA marker data and through simulation studies. Methods which may reduce computation time are discussed and illustrated.     

构建和谐铁路路风系统的理性选择

铁路路风是指铁路的行业风气,是铁路企业和铁路职工经营管理素质、理想纪律素养、职业道德风貌的外在表现,反映铁路企业管理水平和职工精神面貌的综合指标。铁路路风质量的优劣,集中反映在铁路运输产品——旅客和货物的位移质量上。运输产品的全部质量特征包括安全、准确、舒适、迅速、经济、便利和文明服务等诸多方面。旅客和货主就是根据这些来全面判断路风质量优劣的。必须从整体上对路风质量实行全面控制,不能顾此失彼。     

社会工作介入退役军人安置工作的思考

将社会工作的理念、方法、技巧介入到军人退役安置工作,有助于促进安置问题的解决。     

Influential factors in the choice of public transportation or cars as the mode of transportation in habitual commutes / Factores que influyen en la elección del transporte público o el automóvil como modo de transporte en los desplazamientos habituales

The goal of this study is to analyse the differences in attitudes towards habitual modes of transportation among users of public and private transportation. The explanatory capacity of attitudes when determining the mode choice, along with the structural and sociodemographic factors, are also verified. The study was performed in three Spanish cities with 742 participants. The results revealed that cars are better rated than public modes of transportation in the attributes associated with immediate advantages (i.e., speed and availability) and convenience. Subways are highly rated in both immediate and deferred advantages (environment, safety, cost and health). Buses are the mode rated the lowest of the three. Using logistic regression, it was verified that the variance explained by a model that includes attitudes (R² = .639) is higher than the variance explained by a model based solely on variables related to infrastructures (R² = .489). The discussion of these results includes proposals aimed at decreasing car use.     

航空客运收益管理的结构模型

本文分析了收益管理决策目标的组成要素以及内外主要因素;讨论了容量、价格和销售数量三个决策变量与市场需求要素之间的关系;具体地提出了达到收益管理目标可以采用的两条降低成本的途径和五种提高收入的基本方式;从系统的角度提出了集成性收益管理决策的结构模型。     

关于促进河北交通运输业科学发展的思考

交通运输业是国民经济的重要基础性产业,又是引领发展的先导性产业.在现代经济产业布局和经济结构调整中,交通运输业发挥着极其重要的支撑、服务和先导作用.河北省交通运输业只有以科学发展观为统领,在"全面、协调、可持续发展"原则基础上统一规划,多元并进,才能真正实现又好又快发展.     

论城市交通的伦理维度

在分析城市交通中交通公平与交通生态性的内涵特征的基础上,从城市交通政策、交通规划、工程设计与交通组织管理四个层面,探讨了城市交通的伦理内涵。指出城市交通系统运营除了要遵守社会公认的伦理道德规范,更应兼顾出行效率、交通公平与生态性,从而使城市交通符合伦理诉求。     

湘西州公路客运行业发展的问题及对策

公路客运业属社会公共服务行业。湘西州公路客运行业历经改革开放20余年的发展,有了长足的进步,较好解决了人民群众乘车难的问题,基本建立了较为完善的客运市场监管体系,反映了湘西州社会经济发展水平。由于历史的原因,湘西州公路客运行业发展还面临着诸多问题,还不能充分满足社会和人民群众对公路客运行业新的更高需求。     

新时期推进生态文明建设的战略任务

生态文明是不同于工业文明时期的一种有利于人与自然协调发展,经济与社会全面进步的新型文明形态。大力推进生态文明建设是新时期赋予我们的神圣使命,是实现全面建设小康社会奋斗目标的新要求。     

我国城乡居民交通消费的比较研究——以湖南长沙市民与张家界农民为例

我国城乡居民在交通目的、领域、方式、时间、空间等5个方面既存在相同之处也存在差异。这种差异是由城乡地区不同的经济资本、职业性质、当地交通设施等物质原因和消费者的交通观念、交通习俗等精神原因造成的。对城乡居民交通消费差距及其致因的认识有利于我国交通体系的建设。