关于斜Laplace分布与Levy偏稳定分布的性质

目前有关重尾或偏态数据的统计分析和理论模型相对较少,基于传统的Laplace分布,提出一种处理偏态和重尾数据的新模型——斜Laplace分布,以研究其参数估计方法。利用数理统计知识推导出该分布与一些常见分布(如正态分布、指数分布)间的统计关系,并给出一种可通过设置不同参数值得到不同分布的Levy偏稳定分布及其稳定性。     

感性诉求广告创意的新思维

感性诉求的广告创意越来越受到人们的重视,大有后来居上之势。它们一改以往过于强调企业品牌特点和在媒体展开强大广告攻势的硬性手法,代之以亲切、柔和的广告语言,以及自然流畅的广告表现风格,老实诚恳的广告诉求,让消费者有所感触,令消费者着迷。     

汉语歇后语的认知参照点阐释

在言语交际和文学作品中使用歇后语反映了讲话人根据语境需要进行有目的的思想活动,动态地加工、组合概念结构的认知能力和语用技巧。文章运用参照点结构对歇后语的构成和理解进行认知分析,并得出歇后语可以给听话人提供认知参照点的结论。     

青年高级人力资源开发管理人才素质的综合评价

提出了青年高级人力资源开发管理的评价指标体系,采用层次分析法和模糊集合方法论确定了青年高级人力资源开发管理系统中个人素质评价指标的权重并对其进行了综合评价,最后给出了个人素质评价指标体系综合评价的应用实例。     

Verifying safety critical task scheduling systems in PPTL axiom system

This paper presents a case study of formal verification of safety critical task scheduling systems. First, a scheduling algorithm described in a temporal logic programming language is presented; then a sufficient and necessary condition for the schedulability of task set is formalized. Further, the correctness of the condition is proved by means of theorem proving in the axiom system of Propositional Projection Temporal Logic.     

Mortality Patterns of Hydro‐Geomorphologic Disasters

Social impacts caused by floods and landslides in Portugal in the period of 1865–2010 are gathered in the DISASTER database. This database contains 1,902 hydro‐geomorphologic cases that caused 1,248 fatalities (81% and 19% associated with floods and landslides, respectively). The use of the DISASTER database allowed for: (i) the analysis of the frequency and the temporal evolution of fatal floods and landslides; (ii) the analysis of the spatio‐temporal distribution of fatalities; (iii) the identification of the most deadly flood and landside types; (iv) the verification of gender tendencies in mortalities; and (v) the evaluation of individual and societal risk. The highest number of flood and landslide cases and related mortalities occurred in the period of 1935–1969. After this period, the number of flood and landslide mortalities decreased, although landslide fatalities remained higher than those registered in the period of 1865–1934. The occurrence of flood fatalities was widespread in the country, with an important cluster in the Lisbon region and in the Tagus valley, while fatalities caused by landslides mainly occurred in the north of the Tagus valley. Flash floods caused the majority of fatalities associated with floods, while falls and flows were responsible for the highest number of fatalities associated with landslides. Males were found to have the highest frequency of fatalities. In the case of floods, the majority of fatalities were found both outdoors and inside of buildings in rural areas while fatalities inside buildings were dominant in landslide cases, mostly in rural areas.     

Altruism During Ebola: Risk Perception,Issue Salience,Cultural Cognition,and Information Processing

A nationally representative sample of 1,046 U.S. adults was randomly assigned to two experimental conditions that triggered different degrees of risk perception related to the Ebola outbreak. In the high‐risk condition, issue salience and deliberate processing increased individuals’ altruistic behavioral intention. In contrast, cultural cognition worldview and negative emotions such as sadness and anger were significantly related to altruistic behavioral intention regardless of the experimental conditions. These findings suggest that affective responses diverge from cognitive processes in influencing risk‐related decisions. Practically, as the United States continues to send experts to the affected countries in West Africa, results from this study suggest meaningful pathways to improve risk communication intended to encourage more altruistic and pro‐social behaviors.     

Use of Fuzzy Evidential Reasoning in Maritime Security Assessment

Over the last few years, there has been a growing international recognition that the security performance of the maritime industry needs to be reviewed on an urgent basis. A large number of optional maritime security control measures have been proposed through various regulations and publications in the post-9/11 era. There is a strong need for a sound and generic methodology, which is capable of taking into account multiple selection criteria such as the cost effectiveness of the measures based on reasonable security assessment. The use of traditional risk assessment and decision-making approaches to deal with potential terrorism threats in a maritime security area reveals two major challenges. They are lack of capability of analyzing security in situations of high-level uncertainty and lack of capability of processing diverse data in a utility form suitable as input to a risk inference mechanism. To deal with such difficulties, this article proposes a subjective security-based assessment and management framework using fuzzy evidential reasoning (ER) approaches. Consequently, the framework can be used to assemble and process subjective risk assessment information on different aspects of a maritime transport system from multiple experts in a systematic way. Outputs of this model can also provide decisionmakers with a transparent tool to evaluate maritime security policy options for a specific scenario in a cost-effective manner.     

New algorithms for online rectangle filling with <Emphasis Type="BoldItalic">k</Emphasis>-lookahead

We study the online rectangle filling problem which arises in channel aware scheduling of wireless networks, and present deterministic and randomized results for algorithms that are allowed a k-lookahead for k≥2. Our main result is a deterministic min {1.848,1+2/(k−1)}-competitive online algorithm. This is the first algorithm for this problem with a competitive ratio approaching 1 as k approaches +∞. The previous best-known solution for this problem has a competitive ratio of 2 for any k≥2. We also present a randomized online algorithm with a competitive ratio of 1+1/(k+1). Our final result is a closely matching lower bound (also proved in this paper) of $1+1/(\sqrt{k+2}+\sqrt{k+1})^{2}>1+1/(4(k+2))$1+1/(\sqrt{k+2}+\sqrt{k+1})^{2}>1+1/(4(k+2)) on the competitive ratio of any randomized online algorithm against an oblivious adversary. These are the first known results for randomized algorithms for this problem.     

从《农广天地》看农业科教片的画面编辑特点

围绕农业科教片画面的基本要求、段落设置和节奏安排三方面主要内容进行探讨.认为画面编辑水平决定着农业科教片制作水准的高下,从而决定着农业科教片能否达到良好的收视效果和宣传效果.只有不断地发现并掌握农业科教片画面编辑的规律,才能创作出更多更好的为广大农民朋友喜闻乐见的农业科教片.