共查询到20条相似文献，搜索用时 213 毫秒
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杨岭 《淮南职业技术学院学报》2012,(2):41-43
高等教育的公平性问题是人们关注的焦点,要充分认识助困资源公平分配在促进高等教育公平的作用;分析了影响高校助困资源分配公平公正性的因素,在此基础上,提出保障高校助困资源分配公平性的对策建议。 相似文献
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《西安文理学院学报》2016,(1)
针对无线网络中QoS路由优化问题,提出一种综合改进DNA算法的计算模型.其中对于QoS路径寻址提出改进DNA顶点着色的算法模型;对于QoS最优路径寻址提出改进DNA贪婪算法的算法模型,最后通过DNA实验仿真得到QoS路由优化结果对比.实验结果证明此算法的有效性与正确性. 相似文献
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针对传统的资源分配大多没有综合考虑移动终端的动态性以及用户请求资源任务差异等问题,提出了在移动云计算环境下的资源分配算法。该算法采用QoS属性的整体性能来体现移动终端性能,首先通过Qos属性树相似度匹配得到用户请求资源的性能,然后根据相似度与资源之间的映射进行资源分配。实验结果表明,该资源分配方法在降低虚拟机初始化数量的同时,提高了资源利用率。 相似文献
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非正交多址 （NOMA）技术大大提高了频谱效率,并且支持海量连接,是第五代移动通信中最具潜力的多址技术。现有NOMA资源分配算法仅从功率分配或子载波分配单一角度出发,未实现两者的联合优化。因此,为实现发射功率受限时最大化系统总传输速率的优化目标,在子载波分配方案确定的情况下,提出一种基于固定子载波分配的功率分配方案。在此基础上,提出一种基于速率贡献比的删除准则,以实现子载波和功率的联合优化。仿真结果表明,该方案明显优于传统的NOMA功率分配方案,不仅降低了算法复杂度,而且提升了系统性能。 相似文献
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对高速铁路下行MIMO-OFDM系统中的动态资源分配问题进行研究.联合考虑子载波、天线、时隙和功率,将多维资源分配问题建模为混合整数非线性规划问题.分析移动速度对多普勒频移的影响,并计算子载波间干扰功率.在总发射功率不超过一定阈值的约束条件下,将最大化系统吞吐量作为优化目标.为了降低求解最优化问题的计算复杂度,采用两步求解法得到次优解.首先,在等功率分配的前提下,将子载波、天线和时隙分配给不同用户.然后,根据第1步资源分配的结果,进行功率分配.仿真结果显示,提出的多维资源分配策略与已有策略相比在系统吞吐量方面具有较大的性能提高. 相似文献
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尹然然 《西安文理学院学报》2018,(4)
针对未来网络资源任务具有明显的动态变化特征,导致资源存在利用率严重失衡的现象,提出了基于凸优化的未来网络资源分配策略(Future network resource allocation strategy,FNRAS).本分配策略结合应用了窗口思想的负载热点预测方式,根据实际分配速率与分配效果确定网络资源类型的数量,通过全局搜索的方式构建了凸优化以确定网络资源的最佳放置形式.同时将本文算法跟贪心算法、顺序放置以及标准社会力群智能优化等算法之间的差异性进行对比.结果显示:该算法具有比其它各类算法更明显的优势,可以将本文研究结果作为改善未来网络资源性能的重要理论参考. 相似文献
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《绵阳师范学院学报》2021,(2):88-93
QoS组播路由服务性能的优化是全球性挑战的话题,此次研究针对如何准确求解符合网络质量要求的带宽、延时等约束条件,提出了一种基于FFO算法的QoS组播路由性能优化模型,引入随机嗅觉搜索策略和概率视觉灵敏性定位策略进行算法优化并利用果蝇味道浓度判定函数求解组播路由问题.通过对比7种进化算法在六种场景中的收敛速度和运行时间以及求解质量,证实PVFFO算法具有明显的优势.希望研究为播路由服务性能优化提供参考. 相似文献
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通过研究5G网络传送单位比特信息所需要的能量与调度器所分配给用户的调制编码方式之间的关系,把研究成果与现实5G网络中进行干扰优化,结合现实5G网络一天之内的负载变化规律相结合,提出一种运用于5G网络干扰最小化资源分配算法,该算法通过资源分配实现5G网络干扰最小化。在系统负载较轻时,通过最大化无线资源分配,降低用户频谱效率,进而减低业务发送功率和网络的干扰总水平;在网络负载较重时,系统的无线资源受限,该算法退化到普通资源分配算法。最后对新提出的算法进行系统仿真验证,仿真结果证明了新算法在动态业务负载的5G网络中能够很好地降低网络的干扰水平和并进而提升移动终端的电池使用寿命。 相似文献
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We propose the spectrum allocation and resource scheduling algorithms in cognitive point to multipoint （PMP） networks with rapid changes of spectrum opportunities and present a media access control （MAC） protocol based on these algorithms. The objective of spectrum allocation is to make efficient use of the spectrum while maintaining the transceiver synchronization on frequency and time in the network. The objective of resource scheduling is to guarantee the quality of service （QoS） requirements of different kinds of connections and to minimize the total energy consumption in the network as well. By sensing only a small set of possible channels in each slot based on the state transition probability of each channel, our spectrum allocation algorithm achieves high spectrum efficiency in the network. The resource scheduling problem is divided into three sub problems and we derive optimal solutions to these problems by greedy algorithm and convex optimization. The simulation results show that our algorithm can make efficient use of the spectrum and the network resources at a cost of low computational complexity. 相似文献
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Based on five scheduling types and their QoS requirements defined in IEEE 802.16e specification, this paper proposes a new scheduring algorithm for non-real-time or real-time multimedia services. Taking the performances of efficiency, fairness and complexity into consideration, the proposed algorithm enhances the efficiency of air interface resource at the expense of the short-time unfairness, but ensures the long-time fairness. Moreover, the proposed algorithm introduces an efficient QoS assurance mechanism, which implements the functions of congestion control, queuing management and traffic management. The simulation results based on a simplified traffic model show that the proposed algorithm guarantees better performances of efficiency and fairness than conventional algorithms, without increasing the algorithm complexity. Especially on the occasion of heavy-traffic requirement, the performance of efficiency and fairness can be improved by 50% at most. 相似文献
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研究了多用户场景下多载波码分多址系统（MC—CDMA）的下行信道和功率分配,并将吞吐最大化问题建模成一个混合整数优化问题．为了简化分析,将问题分成2个低复杂度的子问题：功率分配和信道分配．这2个子问题可分别被一个次最优自适应功率分配算法（APA）和一个最优自适应信道分配算法（ACA）解决．通过联合APA和ACA算法,进一步提出了一个自适应信道和功率的分配方案．仿真结果表明：与传统的均匀功率分配算法相比,提出的APA算法更加适用于MC—CDMA系统;此外,提出的自适应信道和功率分配方案可以显著地提高系统吞吐量性能． 相似文献
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Mobility and resource-limitedness pose challenging issues to service configuration for quality of service （QoS） management in ubiquitous computing environments. Previous configuration approaches, such as static resource reservation, dynamic resource allocation and single service composition are not valid in the environments. In this study, we present an adaptive service configuration approach. Firstly, we reduce the dynamic configuration process to a control model which aims to achieve the variation of critical QoS on minimal level with less resource cost. Secondly, to deal with different QoS variations, we design two configuration strategies--service chain reconfiguration and QoS parameter adjustment--and implement them based on fuzzy logic control theory. Finally, a configuration algorithm is developed to flexibly employ the two configuration strategies in tune with the error of critical QoS in configuration process. The results of simulation experiments suggest that our approach outperforms existing configuration approaches in both QoS improvement and resource utilization. 相似文献
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With the rapid growth of service scale, there are many services with the same functional properties but different non-functional
properties on the Internet. There have been some global optimizing service selection algorithms for service selection. However,
most of those approaches cannot fully reflect users’ preferences or are not fully suitable for large-scale services selection.
In this paper, an ant colony optimization (ACO) algorithm for the model of global optimizing service selection with various
quality of srevice (QoS) properties is employed, and a user-preference based large-scale service selection algorithm is proposed.
This algorithm aims at optimizing user-preferred QoS properties and selecting services that meet all user-defined QoS thresholds.
Experiment results prove that this algorithm is very efficient in this regard. 相似文献
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基于冲突图模型形成的二进制整数规划,提出了一种蜂窝网络中支持D2D通信的无线资源分配方法．首先,提出一种频率资源分配算法,即为每个D2D链路都分配一个频率资源块．分配频率资源时将尽可能地利用蜂窝网络中的无线频率资源空间重用机会．然后,提出一种时隙调度算法,即为所有分配同一频率资源块的D2D链路进行时隙资源调度．调度时隙资源时将保证使用同一频率资源块的D2D链路之间达到长期平均吞吐率的比例公平．通过计算机仿真对所提出方法的性能进行了验证,结果表明该方法能够在蜂窝网络中实现D2D通信功能． 相似文献
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CHAKARESKI Jacob 《浙江大学学报(A卷英文版)》2006,7(5):773-783
INTRODUCTION According to yearly statistics the demand for multimedia traffic over computer networks is con- stantly on the increase (Nielsen//NetRatings, http:// www.nielsen-netratings.com/). Therefore, it is inevi- table that situations where different media streams will need to share communication resources will be- come commonplace. In such cases, it would be of interest to optimize the overall performance of the network. In other words, resources should be allo- cated across the com… 相似文献
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Wavelength and bandwidth allocation is important for multicast communication in optical networks. In this paper, a new method based on scheduling theory is proposed. The proposed method formulates wavelength bandwidth capacity as a large rectangle and these multicast stream bandwidth requirements as small rectangles. It treats the wavelength and bandwidth allocation question as a rectangle packing problem. The proposed algorithm solves the problem by taking quasi-human strategy with Euclidian distance. It is an effective heuristic algorithm to quickly solve multicast stream bandwidth allocation problem in optical networks by theoretic analysis. Further simulation experiments show the bandwidth allocation algorithm can increase network utilization and have a good fairness performance for unicast stream and multicast stream in optical networks. The results indicate the effectiveness of the algorithm. 相似文献
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基于语义与QoS全局感知的web服务组合 总被引：1，自引：0，他引：1
针对服务组合流程,提出了语义与QoS全局感知的服务组合.在全局语义匹配过程中,既考虑了全局匹配,又考虑了从QoS角度进行匹配.当对服务组合有全局语义满足及QoS约束要求时,在全局范围里选择满足整个服务组合流程的QoS约束和语义匹配度要求的具体服务集,并实现服务组合的优化解.建立了全局匹配的QoS模型及其评价方法,基于该模型及评价方法,采用遗传算法实现全局语义匹配度最大化及满足用户的QoS指标需求.实验结果和分析表明,基于语义与QoS感知的服务匹配算法是可行和有效的. 相似文献