共查询到20条相似文献，搜索用时 281 毫秒
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《科技通报》2017,(12)
资源调度是云计算的重要问题之一,调度策略对云系统性能及运营成本产生直接影响。为了更好满足用户需求,在云计算环境下对多样性资源,提出一种考虑性能及信任需求混合遗传和蚁群思想的负载均衡高效调度方法。依据云计算虚拟性和弹性化要求,提出二级调度策略,先从用户应用程序至虚拟机调度,按照用户多样化需求,将任务性能需求及信任需求作为考量情况,分别通过综合性能效益参数值及综合信任效益参数值描述用户性能需求和信任需求。第二级调度为将任务配置给虚拟资源,基于遗传和蚁群思想,将分类后的任务个体根据适度值大小排序,选取全局最优初始值,通过蚁群搜索获得局部最优解,从而完成多样性资源负载均衡调度过程。仿真实验证明,运用文中资源负载均衡调度方法能够提升云计算系统资源利用效率。 相似文献
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提出了一种在异构环境下负载均衡调度策略,来解决各节点执行引擎负载不平衡的问题。新的调度策略与轮询算法相比,更加能够保证各执行引擎之间负载保持平衡。此外,当多引擎之间任务调度出现不平衡的状态时,该调度算法能动态地调整各节点引擎之间的负载,使之达到平衡状态。 相似文献
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针对云计算系统规模大且执行任务数量多的问题,需要对其进行合理有效的资源调度。目前,云资源调度相关研究主要考虑负载均衡、能源消耗以及用户服务质量等问题,合理的云资源调度算法可以提高系统负载均衡度,改善系统资源利用率和能耗,同时也能提升用户服务质量。文章将近年来国内外研究成果进行了分类探讨,并分析了现有研究的优点及不足。 相似文献
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针对IPv4下网络多媒体技术在实际应用中所暴露出来的局限性和不足,重点从网络响应实时性方面探讨了IPv6下网络多媒体技术应用的服务质量。首先分析了IPv6下网络服务质量的控制策略,在此基础上构建了远程多媒体网络教学系统模型,设置了相应的仿真参数,通过仿真手段研究了IPv6下远程多媒体网络教学中大流量视频负载与数据负载并行传输时的网络响应实时特性,并给出了相应的调度策略,仿真结果表明IPv6下的快速网络响应实时性更适宜发展多媒体远程网络教学系统,对于进一步发展远程多媒体网络教学技术应用具有一定借鉴意义。 相似文献
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《内江科技》2021,(4)
随着云平台的推广使用,平台应用已经初见成效,部分业务系统应用开始逐步向国网云平台迁移。当前云化环境针对基于物理资源部署数据库服务的支撑能力不足、兼容性不佳等问题,严重影响业务系统数据库的上云服务工作开展。我们的研究将以实现云环境下异构数据库的高可用、故障自愈、资源动态调度的系统架构为目标,实现在云环境中对异构数据库的统一运维管理,提升数据库的高可用性和适用范围,为基于云平台、大数据等技术的新一代国网信息化系统建设提供保障。我们将进行基于物理资源的数据库云资源自动化、负载均衡和动态资源调度模型、云环境数据高可用关键技术研究及试点应用、基于物理资源的端到端自动化部署和敏捷交付技术及云环境数据高可用关键技术研究及试点应用的分析策略研究。 相似文献
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资源调度是当前云计算研究的热点,但是云计算中的虚拟节点的资源调度存在效率低,稳定性低的问题。针对这种情况,本文首先建立云计算环境下的资源调度模型,在模型中引入了优化后的蝙蝠算法,优化中引入混沌算法中的立方映射函数,对蝙蝠的个体进行混沌优化,同时缩小了搜索空间,加快了收敛速度。通过在Cloudsim平台上仿真实验表明,该算法在性能上、资源调度效率和任务调度方面都有很大改进,有效提高了云计算系统的资源调度能力。 相似文献
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提出一种新的混合遗传算法。该算法在基于传统遗传算法的基础上采用了分组和负载均衡策略。仿真实验结果表明,这种调度算法有效地实现了资源的负载均衡。它相对于传统遗传算法,收敛速度更快,能产生更好的调度结果。 相似文献
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针对云计算下的负载均衡存在效率低的问题,本文首先在鲸鱼算法的基础上,通过种群初始化,淘汰和竞争机制提高算法的局部搜索能力,然后通过人工蜂群算法进行融合提高算法全局搜索能力,融合后算法用于云计算负载均衡中,在调度时间跨度,负载均衡度和任务平均等待时间方面都具有较好效果。 相似文献
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服务器集群系统的负载均衡和安全性的设计 总被引：1，自引：0，他引：1
随着互联网访问量和数据流量的快速增长,新的应用层出不穷,为提高服务系统的整体性能,采用了负载均衡集群技术。本文对服务器集群复杂均衡调度的设计与实现方法作了一些研究和探讨。通过对负载均衡集群系统的分析,提出从容错性、透明IP、建立VPN隧道、带外数据传输四个方面来加强集群系统的安全,从而提高整个集群系统安全性的理论。 相似文献
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A new solution of networked control systems with bandwidth constraints is proposed in this paper. First, at the smart sensor side, a new stochastic communication logic scheduling strategy is designed based on a Poisson Process with time-dependent intensity. Under this strategy, the system only needs a finite-time state update. Hence the quantity of transmission of message is reduced. With the proof that the stochastic communication logic is essentially a Markov chain, the NCS is modeled as a jump system and the necessary and sufficient condition of stability for the state feedback system is presented as well. With the proposed stochastic communication logic, based on the update time, the controller is given in terms of a LMI. The simulation result shows that the scheduling strategy can decrease the network traffic, while the controller can guarantee certain good system performance. 相似文献
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网格任务调度是采用适当的调度策略把应用程序分配到异构的计算节点上进行高效的执行并返回正确结果的过程。本文研究了经典网格任务调度模型,分析了各自的优缺点,并提出了一种包含有树形全局调度模型和局部调度模型的两层结构模型,此树形全局调度模型通过负载从根节点自上而下的迁移,能够很好地实现网格系统的负载平衡。通过二叉树的节点删除算法能够很好地解决模型中节点的失效问题,因此具有很好的安全性和可靠性。 相似文献
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Jianhua Wang Yan Song Guoliang Wei Yuying Dong 《Journal of The Franklin Institute》2021,358(3):1957-1983
This paper is concerned with the resilient dynamic output-feedback (DOF) distributed model predictive control (DMPC) problem for discrete-time polytopic uncertain systems under synchronous Round-Robin (RR) scheduling. In order to alleviate the computation burden and improve the system robustness against uncertainties, the global system is decomposed into several subsystems, where each subsystem under synchronous RR scheduling communicates with each other via a network. The RR scheduling is adopted to avoid data collisions, however the updating information at each time instant is unfortunately reduced, and the underlying RR scheduling of subsystems are deeply coupled. The main purpose of this paper is to design a set of resilient DOF-based DMPC controllers for systems under the consideration of polytopic uncertainties and synchronous RR scheduling, such that the desirable performance can be obtained at a low cost of computational time. A novel distributed performance index dependent of the synchronous RR scheduling is constructed, where the last iteration information from the neighbor subsystems is used to deal with various couplings. Then, by resorting to the distributed RR-dependent Lyapunov-like approach and inequality analysis technique, a certain upper bound of the objective is put forward to establish a solvable auxiliary optimization problem (AOP). Moreover, by using the Jacobi iteration algorithm to solve such a problem online, the distributed feedback gains are directly obtained to guarantee the convergence of system states. Finally, two examples including a distillation process example and a numerical example are employed to show the effectiveness of the proposed resilient DMPC strategy. 相似文献
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Ioannis E. Pountourakis 《Journal of The Franklin Institute》2002,339(2):145-159
In this paper, we propose the design and analysis of a reservation-based protocol for synchronous WDM multi-channel optical networks. The network architecture is based on a passive star topology and a new architecture for the network interface per station. The main objective of the scheduling algorithm and network interface is to maximize the performance measures by studying the problem of receiver collision phenomena at destination that multichannel nature of WDM networks introduces. We develop an analytical model based on a finite number of tunable receivers and a finite number of stations, following the “tell and go” policy for the access to communication system. Numerical results are showing the performance behavior for various number of channels, stations, and tunable receivers. Also, simulation results are presented for comparison with the results obtained by the performance analysis. 相似文献
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This paper studies the load mitigation problem for wind turbines by using active tuned mass dampers. A state space model for the tower/nacelle system is established with the consideration of tower/blade interaction. The uncertainties that appear in the damping matrix and natural frequencies are also considered in the controller design. External loads acting on the tower including the drag force induced by winds and the absolute base shear induced by the rotating blades are involved, and shaping filters for online generating these loads are proposed which can be easily implemented in numerical simulations. An adaptive sliding-mode controller is proposed to handle the system uncertainties, external disturbances and hard constraint, and also to improve the overall performance of the wind turbine system. Numerical simulations are performed to demonstrate the effectiveness of the proposed control law. 相似文献
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Baoxian Wang Yanli Lv Jigui Jian Xiaowei Jiang 《Journal of The Franklin Institute》2019,356(16):8971-8995
This paper studies the trade-off performance between tracking performance and control input energy of the multi-input multi-output(MIMO), linear and time-invariant(LTI) system over an additive coloured Gaussian noise(ACGN) channel and the encoder-decoder strategies. The restriction that filter in the encoder-decoder strategy must be diagonal matrix is not necessary. And some new results are derived according to the inner-outer factorization. The results show that the trade-off performance is correlated to the unstable pole, non-minimum phase zero of the system. Also new poles and zeros generated by the non-diagonal encoder-decoder strategies may affect the trade-off performance. At last, two examples with different filters and different encoder-decoder strategies are discussed to validate the conclusions. The various encoder-decoder strategies revealed by the simulations may enhance or deteriorate the trade-off performance proposed in this paper. 相似文献
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运用2010—2016年在我国深市创业板上市企业的面板数据,通过将国际化战略进行深度与广度的二维细分,实证考察了风险投资对企业国际化战略的影响效果,并进一步探讨了企业实施国际化战略能否提升企业创新绩效以及风险投资如何影响国际化战略对企业创新绩效的作用效应。研究发现：（1）风险投资介入对企业国际化深度与广度战略的制定和实施均具有积极作用。（2）企业实施国际化深度发展战略能够对企业的创新绩效产生显著的提升效应,而国际化广度发展战略却未能对企业的创新绩效产生积极影响,风险投资介入增强了国际化发展战略的创新增值作用,提高了国际化深度与广度战略对企业创新绩效的积极影响。（3）风险投资对国际化战略与企业创新绩效关系的调节作用会由于企业上市后风险投资机构是否继续持有股份以及风险投资机构背景特征和投资契约特征的不同而有所差异。 相似文献
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在GPS(全球定位系统)、GPRS(通用分组无线服务技术)以及利用GSM电信基站进行辅助定位的A-GPS技术都已经十分成熟的今天,我们可以使用这些定位技术及无线传输技术配合同样十分成熟的WEB应用软件开发技术和强大的SQL SERVER数据库管理系统开发出一套集管理、调度和监控为一体的部队车辆管理系统,以实现高效、低耗、可靠、安全的军用车辆管理目标。 相似文献
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Daniel Boothby 《Research Policy》2010,39(5):650-661
Advanced technologies are commonly thought to be complementary to skills. Firms that adopt new technologies (for example, computer-aided design and control) and at the same time invest in skills (for example, training in computer literacy and technical skills) are expected to realize greater productivity gains than those that do not. To validate this expectation, this paper first identifies the combinations of technologies and types of training that are commonly undertaken by firms, presumably as part of their strategies to effectively utilize the adopted technologies and to improve their economic performance. This paper then estimates the relationship between these common technology-training combinations and productivity performance. It shows that these combinations are associated with higher productivity. 相似文献