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Flocking in Multi-Agent Systems with Multiple Virtual Leaders Based Only on Position Measurements 被引量:4
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作者 苏厚胜 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第5期801-807,共7页
Most existing flocking algorithms assume one single virtual leader and rely on information on both relative positions and relative velocities among neighboring agents.In this paper,the problem of controlling a flock o... Most existing flocking algorithms assume one single virtual leader and rely on information on both relative positions and relative velocities among neighboring agents.In this paper,the problem of controlling a flock of mobile autonomous agents to follow multiple virtual leaders is investigated by using only position information in the sense that agents with the same virtual leader asymptotically attain the same velocity and track the corresponding virtual leader based on only position measurements.A flocking algorithm is proposed under which every agent asymptotically attains its desired velocity,collision between agents can be avoided,and the final tight formation minimizes all agents' global potentials.A simulation example is presented to verify and illustrate the theoretical results. 展开更多
关键词 distributed control FLOCKING multi-agent system multiple virtual leaders
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A head-related transfer function model for fast synthesizing multiple virtual sound sources 被引量:1
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作者 LIANG Zhiqiang XIE Bosun 《Chinese Journal of Acoustics》 2013年第2期175-188,共14页
A head-related transfer function (HRTF) model for fast and real-time synthesizing multiple virtual sound sources is proposed. A head-related impulse response (HRIR, time- domain version of HRTF) is first decompose... A head-related transfer function (HRTF) model for fast and real-time synthesizing multiple virtual sound sources is proposed. A head-related impulse response (HRIR, time- domain version of HRTF) is first decomposed by a two-level wavelet packet and then represented by a model composed of subband filters and reconstruction filters. The coefficients of the subband filters are the zero interpolation of the wavelet coefficients of the HRIR. The coefficients of the reconstruction filters can be calculated from the wavelet function. The model is simplified by applying a threshold method to reduce the wavelet coefficients. The calculated results indicate that for a model with 30 wavelet coefficients, the error of reconstructed HRIR is about 1%. And the result of a psychoacoustic test shows that a model with 35 wavelet coefficients is perceptually indistinguishable from the original HRIR. When multiple virtual sound sources are synthesized simultaneously, the computational cost of the proposed model is much less than the traditional HRTF filters. 展开更多
关键词 HRIR HRTF A head-related transfer function model for fast synthesizing multiple virtual sound sources HEAD
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Efficient Multi-Tenant Virtual Machine Allocation in Cloud Data Centers 被引量:2
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作者 Jiaxin Li Dongsheng Li +1 位作者 Yuming Ye Xicheng Lu 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2015年第1期81-89,共9页
Virtual Machine(VM) allocation for multiple tenants is an important and challenging problem to provide efficient infrastructure services in cloud data centers. Tenants run applications on their allocated VMs, and th... Virtual Machine(VM) allocation for multiple tenants is an important and challenging problem to provide efficient infrastructure services in cloud data centers. Tenants run applications on their allocated VMs, and the network distance between a tenant's VMs may considerably impact the tenant's Quality of Service(Qo S). In this study, we define and formulate the multi-tenant VM allocation problem in cloud data centers, considering the VM requirements of different tenants, and introducing the allocation goal of minimizing the sum of the VMs' network diameters of all tenants. Then, we propose a Layered Progressive resource allocation algorithm for multi-tenant cloud data centers based on the Multiple Knapsack Problem(LP-MKP). The LP-MKP algorithm uses a multi-stage layered progressive method for multi-tenant VM allocation and efficiently handles unprocessed tenants at each stage. This reduces resource fragmentation in cloud data centers, decreases the differences in the Qo S among tenants, and improves tenants' overall Qo S in cloud data centers. We perform experiments to evaluate the LP-MKP algorithm and demonstrate that it can provide significant gains over other allocation algorithms. 展开更多
关键词 virtual machine allocation cloud data center multiple tenants multiple knapsack problem
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