On Inverse Problems of Optimum Perfect Matching

As far as we know, for most polynomially solvable network optimization problems, their inverse problems under l ₁ or l norm have been studied, except the inverse maximum-weight matching problem in non-bipartite networks. In this paper we discuss the inverse problem of maximum-weight perfect matching in a non-bipartite network under l ₁ and l norms. It has been proved that the inverse maximum-weight perfect matching under l norm can be formulated as a maximum-mean alternating cycle problem of an undirected network, and can be solved in polynomial time by a binary search algorithm and in strongly polynomial time by an ascending algorithm, and under l ₁ norm it can be solved by the ellipsoid method. Therefore, inverse problems of maximum-weight perfect matching under l ₁ and l norms are solvable in polynomial time.     

"双因素"问题的理论分析

"双因素"关系存在于诸多的管理问题之中.作为企业参与市场竞争基本资格的保健因素,具有壁垒性、同质性、动态扩展性、系统性和沉没成本等特性;而对企业竞争能力起关键作用的激励因素,具有异质性、生命周期性、增值性、自觉生成性和单项突出性等.本文还就"双因素"现象的来源、类别,保健因素与激励因素的相互关系及其经济学内涵等问题,进行了初步探讨.     

狄奥尼索斯崇拜来源考证

狄奥尼索斯崇拜的起源问题一直是古希腊宗教史研究中的一个谜。古往今来,许多学者对此作出了自己的猜测和判断。文章介绍了较有影响的几种学说,包括已经为人们接受的“色雷斯———弗里几亚”说和“希腊本土”学说,同时也指出了这几种学说存在的漏洞和疑点。通过考证和推理,文章认为“本土”说与古希腊宗教的发展轨迹更相吻合。     

新形势下高校青年教师思想政治工作初探

通过分析当前高校青年教师的思想政治状况以及思想政治工作中存在的问题,重点论述了新时期要以“三个代表”思想来指导高校青年教师的思想政治工作。     

积累与感悟--高一阶段学生作文指导点滴体会

高一年级学生作文现状不容乐观.结合"作文教育与人的发展"课题研究提出中学作文应从我国传统教学实践和教学理论中汲取营养,走"积累、感悟"之路.     

虚拟经济、实物经济与金融危机

虚拟经济是市场经济高度发展的产物。随着经济全球化和金融自由化的发展 ,其总体规模已超过实物经济。实物经济的发展、运行效率的提高均与虚拟经济的扩张发展密切相关 ,但当虚拟经济完全脱离实物经济极度膨胀时 ,就会形成经济泡沫 ,最终引发金融危机。因此 ,及时研究虚拟经济的内涵及与实物经济、金融危机的关系具有重要的理论与现实意义     

Beliefs and social norms about codeine and promethazine hydrochloride cough syrup (CPHCS) onset and perceived addiction among urban Houstonian adolescents: an addiction trend in the city of lean

In the current study, we used a qualitative approach to investigate relevant beliefs and norms associated with codeine and promethazine hydrochloride cough syrup (CPHCS) consumption, initiation, and perceived addiction among 48 alternative school students who identified themselves as current CPHCS users. In general, both boys and girls believed that CPHCS addiction started during an individual's initial consumption. A majority of both groups reported that their second CPHCS event was initiated during the same or next day after their first event. Our findings suggest that friends and an innovative form of hip-hop music called "screw" are strong reinforcers of CPHCS use.     

An analysis of VDT monitor placement and daily hours of use for female bifocal users

A population of 72 bifocal wearers was studied to determine the relationship between VDT (video display terminal) placement for those who reported musculoskeletal pain and those who did not. The mean hours worked was 50.4 minutes (p=0.003) greater for those who reported head/neck pain versus those who did not and 48.6 minutes (p=0.004) greater for those who reported shoulder/arm pain that those who did not. There was no statistically significant difference between the means of monitor height, distance, or angle for those who reported pain symptoms versus those who did not. This study indicates that, self reported pain symptoms are correlated with hours of VDT work and that there appears to be a threshold at approximately five hours for pain symptoms among bifocal wearers. No such correlation can be made for monitor placement     

Healing in familiar settings: support for children and youth in the classroom and community

The Classroom-Based Intervention emphasizes a specific theme each week to allow children to construct safe places to express their stories and develop coping strategies in a group environment.