共查询到20条相似文献，搜索用时 15 毫秒
1.
2.
《实验室研究与探索》2018,(9)
研究云数据中心中基于合并与迁移技术的能耗优化问题。提出了一种能效虚拟机部署策略,该策略能够降低数据中心中活动服务器的数量;为了同步优化数据中心的能耗、服务等级协议(Service Level Agrement,SLA)违例及虚拟机迁移量,提出了一种基于双门限值的虚拟机迁移选择算法,实现了多目标的均衡优化。仿真实验结果表明,新算法不仅可以降低数据中心能耗,而且可以同步降低SLA违背和虚拟机迁移量,实现多目标均衡优化。 相似文献
3.
GridSim模拟器是网格相关研究中通用的模拟、分析工具.为了进一步丰富GridSim模拟器功能以使其更好地支持算法、性能模拟,提出并实现了在GridSim中引入优先级的预留策略,扩充了GridSim的性能.在优先级预留系统中,对GridSim预留模块中已有的先来先服务（FCFS）预留调度算法进行了改进,将优先级与先来先服务相结合提出了一个新的预留调度算法ARWithPriorityPolicy.实验结果表明,结合优先级的预留调度算法可以有效减少被拒绝的预留请求数目. 相似文献
4.
为解决集中式服务发现结构存在的性能瓶颈问题,基于领域本体语义信息,提出一种能自适应地调整领域划分、分配系统资源的分布式web服务发现体系结构,并分析了该结构的可扩展性、自组织性和自适应性.具体描述了该结构下的语义web服务发现算法的2个阶段:语义注册中心定位和基于输入输出的服务匹配.在注册中心组成的平衡树拓扑结构中,注册代理能够快速将请求转发至目标注册中心,避免产生性能瓶颈.然后,通过引入一种新的基于语义距离的服务匹配算法来进行服务查询效果优化.模拟实验结果表明:提出的服务发现方法具有高可扩展性的优点;与其他服务查询算法相比,服务匹配算法具有更高的查全率和查准率. 相似文献
5.
高能耗已经成为云计算数据中心的一个重要课题。[1]本文提出了一个基于CPU和内存的二维贪婪型启发式算法,在部署虚拟机的过程中有效地实现了CPU和内存两种密集型服务的组合,同时考虑了虚拟机的服务时间单元,减少了虚拟机的迁移;采用的双阈值策略保障了服务质量并进一步减少了能耗。实验表明该算法具有较好的性能。 相似文献
6.
一种快速的基于分区域的公交线路选择算法 总被引：1，自引：0，他引：1
提出了一种快速的基于分区域的公交线路选择算法。本算法首先把所有的公交车站划分为若干个区域,然后按照每个线路上为目标区域的站点数来确定搜索线路的优先级,而对于一条特定的线路上的站点,则按照站点是否在目标区域来确定搜索优先级。算法只搜索其中优先级较高的一部分,并且使用从起点终点两向同时搜索的技术,极大地减少了搜索空间。实验表明,该算法是快速而有效的。 相似文献
7.
随着各大数据中心的建立,数据中心达到成千上万台服务器的规模。计算节点之间存在差异性,传统调度算法很难满足计算中心资源调度,主机之间难免出现负载不均衡,直接影响了云平台提供服务的能力,造成资源浪费。根据数据中心的实际情况,基于现有环境下各种主流资源调度策略,针对资源分配与主机运行时动态调度两方面提出完整的资源调度策略方案,提高数据中心计算能力,避免不必要的资源浪费,显著改善数据中心服务质量,实现各种资源负载均衡。 相似文献
8.
9.
为解决基于服务质量的服务选择,提出了一个多属性群决策算法.该算法通过使用Borda社会选择函数集成了多种具有不同原理用于计算不断变化的服务质量方法的结果,从而增强了服务选择的可靠性.实验结果表明该方法具有较好的可扩展性,从而能适用于大规模的分布式服务计算环境;同时相比于随机和轮转服务选择策略,所提出的基于群决策的服务选择策略具有更优的性能,它能够有效地优化服务选择.该算法不仅仅是增加了一种用于获取不断变化的web服务质量的方法,而是建立一个具有多层知识的综合信息体,从而保障了服务选择的正确性. 相似文献
10.
网格任务调度算法是一个复杂的算法,并且被认为是一个NP难问题,在分析该算法的基础上,指出该算法的缺点：负载不均衡,算法的经济效益比较高以及不能兼顾到任务的紧迫程度,因此,从经济效益和优先级角度改进该算法,通过建立数学模型的方法,证明了改进后的算法能够在一定程度上均衡负载,并且也降低了算法调度过程中的费用问题,还满足了优先级高的任务的需求,从总体上来说,该算法提高了算法的效率,并提高了网络的整体性能。 相似文献
11.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
12.
13.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
14.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
15.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
16.
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
17.
18.
GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
19.
The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
20.
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献