新形势下大学公共英语教学面临的新问题及其对策

高校扩招造成了学校教学资源的紧缺，因而产生了大班教学的英语课堂授课方式，同时大学英语四、六级改革也对原有教学模式提出了新的要求，在这种新的形势下，大学公共英语教学必须进行相应的变化才能适应新的要求。本文从课堂教学方式、课堂组织方式、课外学习监督等方面提出了多煤体教学手段、小组活动形式、网络和电子教室配合课堂教学等相结合的方式，并结舍实践对其科学性和可行性等进行了探讨。     

Democratic group signatures with linkability from gap Diffie-Hellman group

Democratic group signatures(DGSs) attract many researchers due to their appealing properties, i.e., anonymity, traceability and no group manager.Security results of existing work are based on decisional Diffie-Hellman(DDH) assumption.In this paper, we present a democratic group signature scheme based on any gap Diffie-Hellman(GDH) group where DDH problem is easily but computational Diffie-Hellman(CDH) problem is hard to be solved.Besides the properties of ordinary DGSs, our scheme also provides the property of linkability, i.e., any public verifier can tell whether two group signatures are generated using the same private key.Security properties of our scheme employ a new and independently interesting decisional product Diffie-Hellman(DPDH) assumption which is weaker than DDH one.     

Non-interactive and non-malleable commitment scheme based on q-one way group homomorphisms

Commitment scheme is a basic component of many cryptographic protocols, such as coin-tossing, identification schemes, zero-knowledge and multi-party computation. In order to prevent man-in-middle attacks, non-malleability is taken into account. Many forming works focus on designing non-malleable commitments schemes based on number theory assumptions. In this paper we give a general framework to construct non- interactive and non-malleable commitment scheme with respect to opening based on more general assumptions called q-one way group homomorphisms (q-OWGH). Our scheme is more general since many existing commitment schemes can be deduced from our scheme.     

Zp×Zp的全形及p2q阶群的同构类数

阶素因子个数较小且每个素因子的次数较低的有限群在群的研究中有重要的作用,很多与群结构相关的结论都是利用这种群描述的(比如可解群)。利用线性群的方法以及群的线性表示的思想,给出Zp×Zp的两个相对全形同构的一个性质充分条件,并利用这一充分条件,给出p2q阶群的同构类数的另一证明。     

一类二型Fuchsian群的局部化性质

为了讨论整数的整二次型表示,引进整二次型的θ-级数,并发现θ-级数与模群的自守形式有紧密的联系.Fuchsian群及其自守形式是模群与模形式的重要延伸.对于一类二型Fuchsian群H(4q),这是G(然)的一个子群.众所周知,G(√q)中的元素要落H(√q)中需要有诸多限制.简化这些限制条件是很有意义的.利用p -局...     

Container Terminal Development in Mainland China and Its Impact on the Competitiveness of the Port of Hong Kong

In recent years, China's container ports have experienced a significant expansion in throughput and capacity. This paper provides a review of the sector and analyses the recent development of container ports and terminals within Mainland China. It then focuses in more depth on the competition between the ports of Shenzhen and Hong Kong. In particular, the port of Shenzhen is analysed in the context of Robinson's criteria for hub port development to try to discern whether it will become the dominant regional hub. The discussion concludes that despite Shenzhen's current competitive advantages, Hong Kong will, in all probability, retain its dominant role.     

汽车行业集团管控下的自主研发模式

以全球范围内汽车工业的发展趋势和研发管理的演变为对照，分析了国内汽车工业的研发管理发展情况，同时侧重分析国内汽车行业中在集团公司背景下研发模式的选择，并探讨了研发管理的发展方向——自主研发模式。     

基于灰色理论的桥梁群桩基础工后沉降预测

文章基于灰色系统理论,应用其等时距GM（1,1）模型及改进的新陈代谢模型对桥梁群桩基础工后沉降进行预测,通过与蕴藻浜特大桥某墩的沉降观测资料的对比分析,提出了桥梁群桩基础工后沉降灰色理论预测方法。     

国外港口群管理先进经验之探析

介绍了一些国家对港口群管理的先进经验。其中有关国的纽约一新泽西港务局、欧洲海港组织、日本运输省等。他们在港口群建设中大胆实践,总结出了统一协调、广泛合作的港口群建设经验,并提出了港口群规划的新思路,提出了确保港口运营自主性的重要性。     

津冀地区港口战略联盟研究

为适应津冀地区经济高速发展的需要,促进津冀港口群的协同发展十分重要。分析了津冀地区各港口群的现状和环境,并分析了津冀地区各港口的竞争力和战略定位。最后,提出了津冀地区港口的战略联盟方案。