A two phases queueing system with Bernoulli vacation schedule under multiple vacation policy

This paper deals with a single server Poisson arrival queue with two phases of heterogeneous service along with a Bernoulli schedule vacation model, where after two successive phases service the server either goes for a vacation with probability p (0≤p≤1) or may continue to serve the next unit, if any, with probability q(=1−p). Further the concept of multiple vacation policy is also introduced here. We obtained the queue size distributions at a departure epoch and at a random epoch, Laplace Stieltjes Transform of the waiting time distribution and busy period distribution along with some mean performance measures. Finally we discuss some statistical inference related issues.     

数字电视视频压缩标准

简述MPEG、JPEG与H系列图像压缩编码国际标准中与高清晰度数字电视视频相关的编码技术,并指出各自的特点、性能与应用。     

“一带一路”背景下我国对外石油投资探析

在我国企业对“一带一路”沿线国家的投资中，石油一直是一个重要的领域。我国石油企业的主体是国有企业，其对外石油投资具有一定的特殊性和复杂性。在我国石油企业的对外投资中，就驱动因素而言，既有企业的内在需要，又有国家的政治需要，国家利益与企业利益存在一致性；在区位选择时，资源国石油储量的丰裕程度和品位优劣是首要的影响因素，同时当地的政治社会环境也是重要的考量因素；在布局过程中，我国石油企业要接受政府的引导，且其所有权优势、区位优势、内部化优势的形成也离不开政策支持。我国石油企业要充分利用这些优势，积极扩大与“一带一路”沿线国家的石油投资合作，在实现企业利益的过程中促进国家利益和企业利益的耦合。     

Evolution of recent economic-demographic modeling: A synthesis

This paper develops a flexible framework for modeling population's role in economic growth by assessing and extending a rendering suggested by several Harvard economists. Our framework includes a ``productivity' model explaining output-per-worker growth and a ``translation' model translating that growth into per-capita terms. We specify a core economic model and several ``enriched' demographic variants that include dependency, size, and density. Regressions using a cross-country panel spanning the period 1960-1995 reveal that combined impacts of demographic change have accounted for approximately 20% of per capita output growth impacts, with larger shares in Asia and Europe. An earlier draft of this paper was presented at a conference on ``Population Change, Labor Market Transition and Economic Development in Asia,' Institute of Economics, Academia Sinica, Taipei, Taiwan, 6–9 December 2002. A pre-publication version of this paper will be presented at a joint conference (by COE/JEPA) entitled ``Towards a new economic paradigm: Declining population growth, labor market transition and economic development under globalization,' held at the Awaji Yumebutai International Conference Center, Kobe, Japan, 17–19 December 2005. We have benefited from comments by Michelle Connolly, Andrew Mason, Pietro Peretto, Warren Sanderson, Alessandro Tarozzi, Jeffrey Williamson, and two anonymous referees. Responsible editor: Junsen Zhang.     

论五四时期东方文化派的调和思想——兼论东方文化派的孔子观

五四时期,当众多知识分子就文化选择、孔子评价等问题进行激烈争论的时候,东方文化派也积极参与,深入评论,成为这场中西文化大论战中的一个重要思想流派。他们一方面要求保存传统、昌明孔教,另一方面,反对顽固守旧,提倡中西融合,批判神化孔子,对当时的思想界影响很大。调和中西、折衷新旧,是东方文化派中西文化观的基本特征。这一特征形成于新旧思潮的激烈冲突中,反映了五四时期文化选择的艰难。     

论寻根文学的启蒙意义兼与“五四”之比较

寻根文学与“五四”是两个表面相似而实质不同的文学启蒙运动。五四启蒙思想由于对传统性的全盘否定成了“无根状”思想。寻根文学表现出了更多的对传统的认同、欣赏甚至迷恋,而完全丧失了主体性和批判精神。这样,寻根文学追求的“国民性重建”也是不可能实现的。     

Asymptotic distributions of quadratic forms occurring in changepoint problems

A stochastic-process approach is used to derive the asymptotic distributions of quadratic forms occurring in the analysis of changepoint data.     

“五四”知识分子“原罪”意识批判——从诗歌中“人力车夫”形象谈起

“原罪”意识是深藏“五四”知识分子灵魂深处的恶性基因。上世纪初期,“原罪”之端倪已在“人力车夫”文学中得到具象显现。它与劳工神圣观念紧密结合,吞噬着知识分子的启蒙意识、独立人格、精英立场,最终促成了“文革”中知识分子的集体缺席。     

复合材料的四相球模型及其应用

本文提出复合材料的四相球模型来描述含涂层位于复合材料及合空心球复合材料的力学行为，得到了这两类复合材料有效模量预测的理论公式。通过与已有理论和实验结果的比较，证明了本文结果的合理性．     

留日学生在五四运动中的作用探析

五四运动是我国历史上一次意义深远的爱国运动,学生是这次运动的主力军。但是传统观点往往把这个"学生"范畴定格为国内的进步学生,而大量史料表明,留日学生在此次运动中,起到了不可估量的作用。无论是早期留日归来的抑或是当时滞留日本的对运动的准备、组织、发动、领导都做出了极为重大的贡献。