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2016 17th International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)最新文献

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A Novel Trust Model for Activity Social Network Based on PeerTrust 基于PeerTrust的活动社交网络信任模型
Limei Xu, Yining Ma, Kai Lei
Recently, kinds of Social Network Services (SNS) have gained enough popularity among Internet users. Activity Social Network (ASN) service, as a new kind of SNS with interest as the core, is dominated by the activities and it connects users much closer through social activities. However, cheating behaviors appear frequently in SNS especially ASN because of their anonymity, which makes a large lack of trust in ASN and becomes a stumbling block that hinders the development of ASN. The researches on trust mechanism have become a key issue in recent years, but most studies focused on E-commerce and traditional social networks. The existing models are not completely suitable for social activities. Motivated by the idea of PeerTrust to compute trust values, we propose ActivityTrust model based on PeerTrust according to its unequal interaction characteristics to ensure the security and reliability of the activity social platform. Meanwhile, we build a simulative ASN platform on NetLogo, and make contrast experiments on it. We verify the effectiveness and adaptability of trust model with regards to activity success rate and trust evaluation rate.
最近,各种社交网络服务(SNS)在互联网用户中得到了足够的普及。活动社交网络(ASN)服务作为一种以兴趣为核心的新型SNS,以活动为主导,通过社交活动将用户联系得更加紧密。然而,由于社交网络尤其是ASN的匿名性,作弊行为频繁出现,这使得人们对ASN的信任度严重不足,成为阻碍ASN发展的绊脚石。信任机制的研究是近年来研究的热点,但研究大多集中在电子商务和传统社交网络上。现有的模式并不完全适合社会活动。基于PeerTrust计算信任值的思想,根据PeerTrust的不平等交互特性,提出了基于PeerTrust的ActivityTrust模型,以保证活动社交平台的安全性和可靠性。同时,在NetLogo上搭建了ASN仿真平台,并进行了对比实验。从活动成功率和信任评价率两方面验证了信任模型的有效性和适应性。
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引用次数: 1
Improving Storage Efficiency for Raw Image Photo Repository by Exploiting Similarity 利用相似性提高原始图像图片库的存储效率
Binqi Zhang, Chen Wang, B. Zhou, Albert Y. Zomaya
Exploiting temporal and spatial locality is a way to improve the performance of data compression and deduplication in a storage system. Through our evaluation, we find that content level similarity measures such as similar tags of photos have a certain correlation to data compressibility. Raw images with similar tags can be compressed together to get better storage space savings. Furthermore, storing similar raw images together enables rapid data sorting, searching, and retrieval if the images are stored in a distributed and large-scale environment with reduced fragmentation. In this paper, we present the correlation results between content similarity and data compressibility using a dataset built from Flickr. The system design we proposed has been based on the evaluation and it optimizes storage efficiency for Top-N relevant images with the same tag. On one hand, the storage space is saved. On the other hand, the design may accelerate the query performance for Top-N relevance search.
利用时间和空间局部性是提高存储系统数据压缩和重复数据删除性能的一种方法。通过我们的评估,我们发现照片的相似标签等内容级相似度量与数据可压缩性有一定的相关性。具有相似标签的原始图像可以压缩在一起以更好地节省存储空间。此外,将相似的原始图像存储在一起可以实现快速的数据排序、搜索和检索,如果图像存储在分布式和大规模的环境中,并且碎片减少。在本文中,我们使用Flickr构建的数据集给出了内容相似度和数据可压缩性之间的相关结果。我们提出的系统设计是基于评估的,它优化了具有相同标签的Top-N相关图像的存储效率。一方面,节省了存储空间。另一方面,该设计可以加快Top-N相关性搜索的查询性能。
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引用次数: 0
Energy Efficient Scheduling of Real Time Tasks on Large Systems 大型系统实时任务的节能调度
Manojit Ghose, A. Sahu, S. Karmakar
High processing capabilities of today's large systems are also used for real time applications, where executing tasks before their deadline is essential. On the other hand, with increase in the processing capability, energy consumption also increases for such systems. Thus energy efficient execution of real time tasks in such large systems has found to be promising research area in recent time. Scheduling tasks in such large systems using only low level power construct like DVFS is not efficient. In this paper, we have exploited the power consumption pattern of the recent commercial processors and derived a simple power model with a higher granularity for systems have large number of processor with each processor having multi-threading feature. We have then proposed an energy efficient scheduling technique namely, smart allocation policy for executing a set of aperiodic independent real time tasks on large system such that no task misses it deadline. We have analyzed the instantaneous power consumption and the overall energy consumption of the proposed policy along with other five baseline policies for a wide variety of synthetic data sets and real trace data. As execution time of tasks has a significant impact on scheduling and on the overall performance of the system, we have considered six different execution time models of task for our experiment. Experimental evaluation reveals that our proposed policy performs significantly better than baseline policies for all the variations of synthetic data and for real trace data.
当今大型系统的高处理能力也用于实时应用程序,在这些应用程序中,在截止日期之前执行任务是必不可少的。另一方面,随着处理能力的提高,这种系统的能耗也随之增加。因此,如何在如此大的系统中高效地执行实时任务已成为一个很有前途的研究领域。在这样的大型系统中,只使用像DVFS这样的低功耗结构来调度任务是不高效的。在本文中,我们利用了最近的商业处理器的功耗模式,并推导了一个具有更高粒度的简单功耗模型,用于具有大量处理器且每个处理器具有多线程特性的系统。然后,我们提出了一种节能调度技术,即在大型系统上执行一组非周期独立的实时任务的智能分配策略,使任何任务都不会错过截止日期。我们针对各种合成数据集和实际跟踪数据,分析了建议策略的瞬时功耗和总体能耗,以及其他五个基线策略。由于任务的执行时间对调度和系统的整体性能有重大影响,因此我们在实验中考虑了六种不同的任务执行时间模型。实验评估表明,对于合成数据和真实跟踪数据的所有变化,我们提出的策略的性能明显优于基线策略。
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引用次数: 0
An Optimization Algorithm for Heterogeneous Hadoop Clusters Based on Dynamic Load Balancing 基于动态负载均衡的异构Hadoop集群优化算法
Wei Yan, Chunlin Li, Shumeng Du, XiJun Mao
Hadoop is a popular cloud computing software, and its major component MapReduce can efficiently complete parallel computing in homogeneous environment. But in practical application heterogeneous cluster is a common phenomenon. In this case, it's prone to unbalance load. To solve this problem, a model of heterogeneous Hadoop cluster based on dynamic load balancing is proposed in this paper. This model starts from MapReduce and tracks node information in real time by using its monitoring module. A maximum node hit rate priority algorithm (MNHRPA) is designed and implemented in the paper, and it can achieve load balancing by dynamic adjustment of data allocation based on nodes' computing power and load. The experimental results show that the algorithm can effectively reduce tasks' completion time and achieve load balancing of the cluster compared with Hadoop's default algorithm.
Hadoop是一种流行的云计算软件,其主要组件MapReduce可以在同构环境下高效地完成并行计算。但在实际应用中,异构集群是一种常见的现象。在这种情况下,它很容易出现负载不平衡。为了解决这一问题,本文提出了一种基于动态负载均衡的异构Hadoop集群模型。该模型从MapReduce开始,通过MapReduce的监控模块实时跟踪节点信息。本文设计并实现了一种最大节点命中率优先算法(MNHRPA),该算法根据节点的计算能力和负载动态调整数据分配,实现负载均衡。实验结果表明,与Hadoop的默认算法相比,该算法可以有效地减少任务完成时间,实现集群的负载均衡。
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引用次数: 9
A Dynamic Migration Method for Big Data in Cloud 云环境下大数据的动态迁移方法
Ding Jiaman, Wang Sichen, Du Yi, Jia Lianyin
Big data applications store data sets through sharing data center under the Cloud computing environment, but the need of data set in big data applications is dynamic change over time. In face of multiple data centers, such applications meet new challenges in data migration which mainly include how to how to reduce the number of network access, how to reduce the overall time consumption, and how to improve the efficiency by the time of balancing the global load in the migration process. Facing these challenges, we first build the problem model and descript the dynamic migration method, then solve the global time consumption of data migration, the number of network access and global load balancing these three parameters. Finally, do the cloud computing simulation experiment under the Cloudsim experiment platform. The result shows that the proposed method makes the task completion time reduced by 10% and the data transmission time accounts for the roportion of the total time is reduced. When the amount of data sets is increase, the proportion can reduces to 50% or less. Network access number lower than Zipf and reached stable, in global load, the variance of the node's store space closed to zero.
大数据应用在云计算环境下通过共享数据中心存储数据集,但大数据应用对数据集的需求是随时间动态变化的。面对多个数据中心,这类应用对数据迁移提出了新的挑战,主要包括如何在迁移过程中减少网络访问次数,如何减少整体时间消耗,如何通过均衡全局负载的时间来提高效率。面对这些挑战,我们首先建立了问题模型并描述了动态迁移方法,然后解决了数据迁移的全局耗时、网络访问数和全局负载均衡这三个参数。最后,在Cloudsim实验平台下进行了云计算仿真实验。结果表明,该方法使任务完成时间缩短了10%,数据传输时间占总时间的比例有所降低。当数据集的数量增加时,该比例可以降低到50%或更低。网络访问数低于Zipf并达到稳定,在全局负载下,节点的存储空间方差接近于零。
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引用次数: 1
A Learning-Based System for Monitoring Electrical Load in Smart Grid 基于学习的智能电网负荷监测系统
S. Ding, Yidong Li, Xiaolin Xu, Hongwei Xing, Zhen Wang, Liang Chen, G. Wang, Yu Meng
This paper mainly presented a system which can make a prediction to the distribution transformer's load status in smart grid. Since the operation of distribution transformer's load status is generally in the post processing stage at the current stage, lacking forecasting work on distribution transformer's operation and load status. Given the issues above, to reduce costs, ensure the security of power supply, and improve the emergency response capabilities, we presented a prediction system, which can predict the load status of distribution transformer by utilising the data mining algorithm. Besides, the system also provides a platform for the management and maintenance of electrified wire netting's information. In this system, users can conveniently manage the vast and multifarious data sets.
本文主要介绍了一种智能电网中配电变压器负荷状态预测系统。由于现阶段配电变压器负荷状态的运行一般处于后处理阶段,缺乏对配电变压器运行和负荷状态的预测工作。鉴于上述问题,为了降低成本,保证供电安全,提高应急响应能力,我们提出了一种利用数据挖掘算法预测配电变压器负荷状态的预测系统。此外,该系统还为电网信息的管理和维护提供了一个平台。在该系统中,用户可以方便地管理庞大而多样的数据集。
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引用次数: 0
An Advanced Load Balancing Strategy for Cloud Environment 云环境下的高级负载平衡策略
Jiadong Zhang, Qiongxin Liu, Jiayu Chen
The rapid development of cloud computing, bring great convenience to developers. Recently the resource management of the cloud platform has become a hot research topic, especially the load balancing problem in data center is very important for cloud provider. In this paper, a load balancing framework is proposed for cloud platform, it use the threshold window strategy and an advanced AR prediction model to reduce the migration of VMs. Experiments show that this method can effectively achieve load balancing, promote the utilization of the physical machines, and solve the frequent migration problem caused by high instantaneous peak values significantly.
云计算的飞速发展,给开发人员带来了极大的便利。近年来,云平台的资源管理已成为一个研究热点,尤其是数据中心的负载均衡问题对云提供商来说尤为重要。本文提出了一种云平台负载均衡框架,该框架采用阈值窗口策略和先进的AR预测模型来减少虚拟机迁移。实验表明,该方法能有效实现负载均衡,提高物理机利用率,显著解决瞬时峰值高导致的频繁迁移问题。
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引用次数: 8
Stochastic Geometry Interference Model for 5G Heterogeneous Network 5G异构网络随机几何干扰模型
Cuili Wang, Chao Yang, Lin Liu, Ping Wang, Heng Liu
In order to meet the increasing demand of data rate, the next generation Mobile Communications (5G) are becoming more heterogeneous, irregular and complex. This will lead to more complex interference environment. So the traditional fixed geometry hexagon model is no longer applicable. In order to more accurately evaluate the performance of the 5G heterogeneous network, in this paper, we proposes to analyze a downlink two-tiers heterogeneous cellular network (HCN) based on the stochastic geometry, which considers the inter-layer and intra-layer spatial correlation between the BSs. We present our empirical study on average SINR and average throughput for edge and hotspot areas. By comparing with the traditional fixed geometry hexagon model, the stochastic geometry model is more suitable and accurate for the actual 5G heterogeneous cellular networks.
为了满足日益增长的数据速率需求,下一代移动通信(5G)正朝着异构、不规则和复杂的方向发展。这将导致更复杂的干扰环境。因此,传统的固定几何六边形模型已不再适用。为了更准确地评估5G异构网络的性能,本文提出了一种基于随机几何的下行两层异构蜂窝网络(HCN),该网络考虑了BSs之间的层间和层内空间相关性。我们对边缘和热点区域的平均信噪比和平均吞吐量进行了实证研究。与传统的固定几何六边形模型相比,随机几何模型更适合实际的5G异构蜂窝网络。
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引用次数: 2
Efficient Scheduling Strategy for Mobile Charger in Wireless Rechargeable Sensor Networks 无线充电传感器网络中移动充电器的高效调度策略
Shanhua Zhan, Jigang Wu, L. Qu, Dan Xin
With the development of wireless sensor networks, the limited battery capacity of sensor nodes has become one of energy bottleneck problem that dominates the wide application of wireless sensor networks. In recent years, wireless rechargeable sensor networks have attracted much attention due to their potential in solving the energy bottleneck problem. In this paper, we study the scheduling strategy of mobile charger in the on-demand mobile charging wireless sensor networks. The proposed strategy divides the sensor nodes of service pool into two categories, such that the mobile charger can provide charging service in some priority according to the degree of charging request urgency during the charging tour. The proposed algorithm successfully reduces charging missing ratio by 89 percent, and it can keep the charging throughput decline rate less than 9.91 percent.
随着无线传感器网络的发展,传感器节点电池容量有限已成为制约无线传感器网络广泛应用的能量瓶颈问题之一。近年来,无线可充电传感器网络因其解决能源瓶颈问题的潜力而备受关注。本文研究了按需移动充电无线传感器网络中移动充电器的调度策略。该策略将服务池的传感器节点划分为两类,使得移动充电器在充电过程中可以根据充电请求的紧急程度提供一定优先级的充电服务。该算法成功地将充电缺失率降低了89%,并使充电吞吐量下降率保持在9.91%以内。
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引用次数: 3
An Efficient Weighted Biclustering Algorithm for Gene Expression Data 一种高效的基因表达数据加权双聚类算法
Y. Jia, Yidong Li, Weihua Liu, Hai-rong Dong
Microarrays are one of the latest breakthroughs in experimental molecular biology, which already provide huge amount of valuable gene expression data. Biclustering algorithm was introduced to capture the coherence of a subset of genes and a subset of conditions. In this paper, we presented a MIWB algorithm to find biclusters of gene expression data. MIWB algorithm uses the weighted mutual information as similarity measure which can be simultaneously detected complex linear and nonlinear relationships between genes. Our algorithm first used the weighted mutual information to construct the seed gene set of each biculster, then we calculated each gene's probability belonging to each bicluster and complete the initial partition of genes set utilizing the given threshold, then by optimising the objective function we completed weights update and conditions set selection, by further repartition of the entire dataset and optimization of biclusters we obtained the final biclusters. We evaluated our algorithm on yeast gene expression dataset, and experimental results show that MIWB algorithm can generate large capacity biclusters with lower mean squared residue.
微阵列技术是实验分子生物学的最新突破之一,它已经提供了大量有价值的基因表达数据。引入双聚类算法来捕获基因子集和条件子集的一致性。在本文中,我们提出了一种寻找基因表达数据双聚类的MIWB算法。MIWB算法采用加权互信息作为相似性度量,可以同时检测基因之间复杂的线性和非线性关系。该算法首先利用加权互信息构建每个双聚类的种子基因集,然后计算每个基因属于每个双聚类的概率,并利用给定的阈值完成基因集的初始划分,然后通过优化目标函数完成权值更新和条件集选择,再通过对整个数据集的重新划分和对双聚类的优化得到最终的双聚类。在酵母基因表达数据集上对该算法进行了测试,实验结果表明,该算法可以生成均值残差较低的大容量双聚类。
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引用次数: 2
期刊
2016 17th International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)
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