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1st International Conference on Advances in Swarm Intelligence, ICSI 2010

作者： Zhang, Junqi Liu, Kun Tan, Ying Key Laboratory of Embedded System and Service Computing Department of Computer Science and Technology Tongji University Shanghai 200092 China Department of Machine Intelligence School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

ISBN: (数字)9783642134951

ISBN: (纸本)3642134947

It is not trivial to tune the swarm behavior just by parameter setting because of the randomness, complexity and dynamic involved in particle swarm optimizer (PSO). Hundreds of variants in the literature of last decade, brought various mechanism or ideas, sometimes also from outside of the traditional metaheuristics field, to tune the swarm behavior. While, in the same time, additional parameters have to be afforded. This paper proposes a new mechanism, named KNOB, to directly tune the swarm behavior through parameter setting of PSO. KNOB is defined as the first principal component of the statistical probability sequence of exploration and exploitation allocation along the search process. The using of the KNOB to tune PSO by parameter setting is realized through a statistical mapping, between the parameter set and the KNOB, learned by a radial basis function neural network (RBFNN) simulation model. In this way, KNOB provides an easy way to tune PSO directly by its parameter setting. A simple application of KNOB to promote is presented to verify the mechanism of KNOB. © 2010 Springer-Verlag.

关键词： Particle swarm optimization (PSO)

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iDARE: Proactive Data Replication Mechanism for P2P VoD system

iDARE: Proactive Data Replication Mechanism for P2P VoD Syst...

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International Conference on computer and Information technology (CIT)

作者： Xiaofei Liao Fan Zhang Hai Jin Linchen Yu Cluster and Grid Computing Laboratory Services Computing Technology and System Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China China University of Geoscience Wuhan China

Peer-to-peer (P2P) on-demand streaming systems inevitably suffer from peers churn that is the inherent dynamic characteristic of overlay network. With frequent peer departure, a large amount of media data cached on peer disk turns offline and unavailable, which becomes the major reason of heavy server load. To address the above issue, a new proactive data replication mechanism is proposed and implemented in existing P2P on-demand system GirdCast. Based on the new mechanism, peer can proactively replicate data chunks to stable cache servers for future sharing, when it has high possibility to leave the overlay. Two key heuristic algorithms are designed for departure prediction and replicated chunks selection. system trace driven simulation shows that the mechanism greatly decreases bandwidth load of media source server and improves the availability of chunks highly demanded but poorly provisioned by overlay peers.

关键词： Servers Peer to peer computing Media Availability Streaming media Bandwidth Distributed databases

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Simplification for texture mapping models with mesh segmentation

Simplification for texture mapping models with mesh segmenta...

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2010 16th International Conference on Virtual systems and Multimedia, VSMM 2010

作者： Wang, Lili Ma, Zhiqiang Xue, Bing Shen, Zhe State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9781424490264

To reduce the loss of visual details in simplification for textured meshes, this paper presents a simplification method based on mesh segmentation. Firstly, the model is partitioned into some sub-meshes according to their properties of appearance, such as texture, normal, etc. Thus, the correlation between sub-meshes can be decreased. Then, we calculate the error metric for the edge collapse in each sub-mesh. Lastly, we merge the simplified sub-meshes and fix the gap among them to regain an integrated mesh. Because the properties of appearance are used to separate the high-frequency details from low-frequency ones, our approach decreases the loss of the detailed. Therefore, we can not only keep the over whole contours of the model, but also maintain better geometric and appearance details. The results of experiments demonstrate our mesh segmentation based method is effective. ©2010 IEEE.

关键词： Mesh generation

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Accelerate Smoothed Particle Hydrodynamics using GPU

Accelerate Smoothed Particle Hydrodynamics using GPU

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2010 IEEE Youth Conference on Information, computing and Telecommunications, YC-ICT 2010

作者： Gao, Xiaopeng Wang, Zhiqiang Wan, Han Long, Xiang State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University 100191 Beijing China

ISBN: (纸本)9781424488841

Physic-based fluid simulation is used extensively nowadays;however the traditional serial algorithm can't satisfy the realtime requirement due to its complexity and compute-intensive. The development of modern GPU makes this possible. In this paper, a Smoothed Particle Hydrodynamics (SPH) method for incompressible fluid was implemented using CUDA on GPU. Since the algorithm was executed on the GPU entirely, the method can take full advantage of massive computational power of modern graphics hardware. The experiment results show that our GPU based SPH implementation can achieve the rate of 89 frames per second in the simulation of 102K particles and gain nearly 140x speedups compared with the serial algorithm. © 2010 IEEE.

关键词： Graphics processing unit

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Moisture effect on the dielectric response and space charge behaviour of mineral oil impregnated paper insulation

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Journal of Physics: Conference Series 2011年第1期310卷

作者： Jian Hao George Chen Ruijin Liao The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University China School of Electronics and Computer Science University of Southampton UK

Dielectric response and space charge behaviour of oil-paper insulation sample with different moisture contents were investigated using the frequency dielectric spectroscopy (FDS) and the pulsed electroacoustic (PEA) technique, respectively. The influence of moisture on the dielectric response and space charge behaviour of oil impregnated paper insulation was analysed. Results show that the moisture has great effect on the FDS and space charge behaviour of oil impregnated paper insulation. In the frequency range of 10−2~106Hz, the conductivity and the capacitance of oil impregnated paper increases with its moisture content. The space charge distribution of oil-paper sample with lower and higher moisture contents is very different from each other. The higher the moisture concentration of the oil impregnated paper, the easier the negative charge penetration into the insulation paper. There is a significant amount of positive charge accumulated at the paper-paper interface near to the cathode for oilpaper sample with lower moisture content. However, the positive charge appears in the middle layer paper for oil-paper sample with higher moisture content. Due to the high conductivity, the charge trapped in the oil-paper sample with higher moisture content disappears much faster than that in the oil-paper sample with lower moisture content after removing the voltage.

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XenHVMAcct: Accurate CPU Time Accounting for Hardware-Assisted Virtual Machine

XenHVMAcct: Accurate CPU Time Accounting for Hardware-Assist...

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IEEE International Conference on Parallel and Distributed computing, Applications and Technologies (PDCAT)

作者： Huacai Chen Hai Jin Kan Hu Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

CPU time accounting is a basis of performance measurement and process scheduling in operating system. Accounting operations are traditionally completed in timer interrupt handler since timer interrupt is periodically delivered to OS. However, when virtualization introduced, the CPU time is shared by multiple virtual CPUs (i.e., VCPU for short) and the virtual timer interrupt is paused for those ones be scheduled out. This makes the time accounting be inaccurate, and we should consider new method for VM to provide a stable and reliable data source, especially for the hardware-assisted virtual machines (i.e., HVM for short) which are not aware of VMM. The key point of accurate CPU time accounting is to distinguish the time allocated to “this VCPU” and “other VCPUs”. Para-virtualization (i.e., PV for short) achieves this goal by modifying the timer handling routines. For HVM, we propose an accurate accounting method (named XenHVMAcct) within Xen virtual platform. XenHVMAcct is designed by using the mechanisms of virtual interrupt and loadable kernel module, without direct modifications to guest OS. Experimental results show that our accounting method is as accurate as the PV solution.

关键词： Kernel Linux Real time systems Measurement Program processors Virtual machining

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MISM: Modelica-Based Interactive Scheduling Mechanism for Virtual Educational Experiments

MISM: Modelica-Based Interactive Scheduling Mechanism for Vi...

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ChinaGrid Annual Conference (ChinaGrid)

作者： Wenbin Jiang Zhen Tang Hai Jin Chao Liu Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

Different virtual educational experiments (VEEs) have different frameworks and implementations in different disciplines. How to integrate different VEEs into one unified supporting platform is a challenging problem. The key problem of this integration is how to build a unified mathematical model for VEEs of diversified disciplines. However, most existing multi-domain uniform modeling (MDUM) approaches such as Modelica are research-oriented and lack of real time interaction, which does not meet the requirement of virtual experiments that are user-oriented and highly interactive. To tackle above problem, a Modelica-based interactive scheduling mechanism (MISM) for VEE is proposed. In MISM, user-oriented interaction is based on a best step length algorithm and an interactive event step algorithm. The throughput is considered in the former and the real time interaction is resolved by the latter. Experimental results shows that the approaches presented can meet the requirements of VEEs efficiently.

关键词： Computational modeling Object oriented modeling Load modeling Adaptation model Data models Mathematical model Real time systems

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Affinity-aware Proportional Share Scheduling for Virtual Machine system

Affinity-aware Proportional Share Scheduling for Virtual Mac...

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The Ninth International Conference on Grid and Cloud computing(第九届网格与云计算国际学术会议 GCC 2010)

VM (virtual machine) scheduling is a fundamental topic of virtualization, and fairness is its important design goal. Most VMMs (virtual machine monitor) provide PS (proportional share) schedulers. A PS scheduler assign a weight to every VM to declare the computational resource requirement, and VM is allocated CPU cycles proportional to weight. CPU-affinity is a property of VCPU (virtual CPU) to describe which PCPUs (physical CPU) it can run on. However, current definition of weight does not collaborate well with CPU-affinity. It behaves as if all PCPUs are available to all VMs. We expose the issue by using Xen’s Credit scheduler, and show that CPU cycles can be fairly allocated to VMs in the default free-mapping case (no affinity restriction), but not so in restricted-mapping cases (when affinities are configured). This fairness issue makes it necessary to extend the meaning of weight, so as to reflect the resource requirements in all cases. In this paper we reconcile the meaning of a domain’s weight with CPU-affinity, and improve Credit scheduler as an affinity-aware one. Experimental results show that our affinity-aware proportional share scheduler (named Credit-APS scheduler) brings a good fairness both in free-mapping and restricted-mapping cases.

关键词： Xen Proportional Share Credit Scheduler Free-mapping Restricted-mapping APS

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Vdismodel: A Display Latency Performance Model in Virtualization Environment

Vdismodel: A Display Latency Performance Model in Virtualiza...

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Sixth International Conference on Semantics,Knowledge and Grids(第六届语义、知识与网格国际会议 SKG 2010)

作者： Bin Zhou Hai Jin Pingpeng Yuan Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

With the rapid development of virtualization technology as well as the good performance of computer hardware, virtual machine is beginning to gradually increase the performance of display to meet the needs of desktop users. However, there is a difference between the display mechanism in the virtual environment and the traditional environment. At present, more is focused on how to effectively and pertinently measure and assess the performance of display in virtualization environment. Taking consideration of the characteristics of display in the virtual environment, the virtual machine display performance evaluation system has following advantages: it can select a representative workload running on the VM in Domain U; make use of Tracing and Instrumentation to insert the record in the kernel of VM; log the relevant information; and then finally draw the performance-related parameters by the analysis of the recorder. This paper mainly depicts the underlying implementation details of the virtual display system in Xen and analyzes the display principle of Xen-based virtual machine. It also proposes a display latency performance model in Xen environment, which is named Vdismodel by verifying the reasonableness of the Vdismodel through a series of experiments and comparing the theoretical data and the measured data which are accessed by the virtual machine system performance evaluation.

关键词： Benchmark testing Servers Virtual machining Computational modeling Driver circuits Virtual environment Performance evaluation

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A value-oriented model for managing service supply chains

A value-oriented model for managing service supply chains

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IEEE International Conference on Industrial Engineering and Engineering Management, IEEM2010

作者： He, T. Ho, W. Xu, X.F. Research Center of Intelligent Computing for Enterprises and Services School of Computer Science and Technology Harbin Institute of Technology Harbin China Operations and Information Management Group Aston Business School Aston University Birmingham United Kingdom

ISBN: (纸本)9781424485031

Service supply chain (SSC) has attracted more and more attention from academia and industry. Although there exists extensive product-based supply chain management models and methods, they are not applicable to the SSC as the differences between service and product. Besides, the existing supply chain management models and methods possess some common deficiencies. Because of the above reasons, this paper develops a novel value-oriented model for the management of SSC using the modeling methods of E3-value and Use Case Maps (UCMs). This model can not only resolve the problems of applicability and effectiveness of the existing supply chain management models and methods, but also answer the questions of 'why the management model is this?' and 'how to quantify the potential profitability of the supply chains?'. Meanwhile, the service business processes of SSC system can be established using its logic procedure. In addition, the model can also determine the value and benefits distribution of the entire service value chain and optimize the operations management performance of the service supply. ©2010 IEEE.

关键词： Supply chain management

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