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2017 18th International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)最新文献

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Investigating the Influence of Adding Local Search to Search Algorithms 研究在搜索算法中加入局部搜索的影响
Nadia Abd-Alsabour
Local search plays a significant role when added to search algorithms as it prompts getting better solutions. Nevertheless, there are numerous situations in which including the local search algorithms does not contribute to the search process and hence should not be incorporated. This paper investigates this issue by performing two types of experiments using one of the most established search algorithms which is genetic algorithms. The obtained results are detailed and discussed in sections five and six respectively.
当添加到搜索算法中时,本地搜索扮演着重要的角色,因为它会提示获得更好的解决方案。然而,在许多情况下,包括局部搜索算法对搜索过程没有贡献,因此不应该纳入。本文通过使用最成熟的搜索算法之一遗传算法进行两类实验来研究这一问题。所得结果分别在第五节和第六节中详细讨论。
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引用次数: 0
Towards Supporting Modeling Variability in E-Learning Application: A Case Study 在电子学习应用中支持模型可变性:一个案例研究
Sameh Azouzi, Sonia Ayachi Ghannouchi, Zaki Brahmi
As e-learning becomes a basic need for several universities, a variety of Learning Management Systems (LMS) is proposed on the market. However, available LMSs do not satisfy all the needs of different institutions, which push them to develop their own systems. Since developing and maintaining new software are cost, time and effort consuming, and with the increasing demand on e-Learning systems, it becomes necessary to find an efficient solution that allows the fast development of systems and overcomes the afore-mentioned issues. We strongly believe that adopting a software product line approach in e-Learning domain can bring important benefits. We propose a general model for collaborative learning processes and we present the development process of an e-Learning software product line. Throughout the development process, we demonstrate how this approach allows us to satisfy the variable needs of universities/learners and benefit from the systematic large-scale reuse at the same time. In order to help organizations in providing similar services without the need to structure each of them separately, this paper presents how to support variability in learning process modeling.
随着电子学习成为许多大学的基本需求,市场上提出了各种学习管理系统(LMS)。然而,现有的lms并不能满足不同机构的所有需求,这促使他们开发自己的系统。由于开发和维护新软件耗费成本、时间和精力,并且随着对e-Learning系统需求的增加,有必要找到一种有效的解决方案,使系统能够快速开发并克服上述问题。我们坚信,在电子学习领域采用软件产品线的方法可以带来重要的好处。我们提出了一个协作学习过程的通用模型,并给出了一个电子学习软件产品线的开发过程。在整个开发过程中,我们演示了这种方法如何使我们能够满足大学/学习者的各种需求,同时从系统的大规模重用中受益。为了帮助组织提供类似的服务,而不需要单独构建每个服务,本文介绍了如何在学习过程建模中支持可变性。
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引用次数: 0
ProjectileSort - Rule Based Parallel Sorting Algorithm - Architecture for Reconfigurable Multi-Partition Object Arrays 基于规则的并行排序算法。可重构多分区对象数组的体系结构
Nandika Liyanage
Data can be store as structured, semi-structured or unstructured formats in various distributed environments. Extraction of data from multiple data sources or data warehouse and convert to a proper order is quite time consuming task even using the latest hardware and software technologies. Sorting is one of the key concepts that helps to improve the efficiency of various computational process. Unlike the early single processor or single server operations using monolithic applications, multi-core distributed environments required more advanced computational theories and algorithms. Existing sorting theories are basically derived from linear algorithms and enhanced to support for distributed processing. This research discuss the characteristics of existing parallel sorting algorithms, techniques, limitation. Aim and objective is to introduce a new pure parallel sorting algorithm and sorting architecture that pointing to execute under latest distributed environments. The proposed pattern and the sorting architecture can be used as rule based parallel sorting technique and algorithm to support for any type of distributed environment to sort infinite dataset.
数据可以以结构化、半结构化或非结构化格式存储在各种分布式环境中。即使使用最新的硬件和软件技术,从多个数据源或数据仓库中提取数据并将其转换为适当的顺序也是非常耗时的任务。排序是帮助提高各种计算过程效率的关键概念之一。与早期使用单片应用程序的单处理器或单服务器操作不同,多核分布式环境需要更先进的计算理论和算法。现有的排序理论基本上是从线性算法衍生出来的,并增强了对分布式处理的支持。本研究讨论了现有并行排序算法的特点、技术、局限性。目的和目标是介绍一种新的纯并行排序算法和排序体系结构,指向在最新的分布式环境下执行。所提出的模式和排序体系结构可以作为基于规则的并行排序技术和算法,支持在任何类型的分布式环境下对无限数据集进行排序。
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引用次数: 0
A New Colluded Adversarial VNet Embeddings Attack in Cloud 云环境下一种新的串通对抗VNet嵌入攻击
I. Liu, Tay-Jiun Fang, Jung-Shian Li, Meng-Wei Sun, Chuan-Gang Liu
Abstract—Nowadays, network virtualization has been widely investigated in order to prevent Internet ossification, and develop future emerging network applications flexibly. However, prior work by Pignolet et al. shows the possible attacking methodology with which the attackers can disclose the whole cloud topology while deploying virtual networks in cloud named “Topology Disclosure Attack”. In this attack model, the attacker pretends to deploy virtual networks in cloud by issuing the graph requests to service provider. And the service provider responds the requests to the attacker after examining his/her topology resources. With this request/reply model, Pignolet et al. believe this attack eventually infers the targeted topology. However, one vital reason leads this attack to the failure- too many virtual requests from one adversary in a time. This paper tries to provide a new topology disclosure attack model, which multiple attackers launch attacks at the same time with the assistance of proposed Query-Trie and network tomography technique. Hence, in this paper, we propose much more possible attack model in cloud and this topic also encourages the network researchers to develop resistance mechanism against it in the future.
摘要为了防止网络僵化,灵活开发未来新兴的网络应用,网络虚拟化得到了广泛的研究。然而,Pignolet等人之前的工作展示了一种可能的攻击方法,攻击者可以在云中部署虚拟网络时披露整个云拓扑,称为“拓扑披露攻击”。在该攻击模型中,攻击者通过向服务提供商发出图形请求,假装在云中部署虚拟网络。服务提供者在检查攻击者的拓扑资源后,将请求响应给攻击者。通过这种请求/应答模型,Pignolet等人认为这种攻击最终会推断出目标拓扑。然而,导致这种攻击失败的一个重要原因是一次来自一个对手的虚拟请求太多。本文试图提供一种新的拓扑披露攻击模型,该模型利用所提出的查询树和网络断层扫描技术,使多个攻击者同时发起攻击。因此,在本文中,我们提出了更多可能的云攻击模型,并鼓励网络研究人员在未来开发针对它的抵抗机制。
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引用次数: 0
Content Delivery Based on Popularity and Time Slot 基于人气和时段的内容交付
Min-Chun Huang, Chi-He Chang, Chao-Wei Tseng, Ru-Jen Lee
Video-on-demand (VoD) service has become the important service in Internet Protocol Television (IPTV) based on Content-delivery-network (CDN). There has been a large amount of media in recently years. Combined with growing users, how to quickly address the video requests from users with low delay is important for industry. In other words, to allocate resource (i.e. media) appropriately according to different situations is critical. This paper proposes strategies which make video replica and put it nearby users (set-up boxes) previously. The proposed strategies not only consider the popularity of the media but also consider its hot time, i.e. the time slots which most of the users access it. The experiment result shows that with the proposed strategies, user requests can be quickly addressed and the overall network traffic load can be reduced.
视频点播(VoD)业务已经成为基于内容分发网络(CDN)的互联网协议电视(IPTV)的重要业务。近年来有大量的媒体报道。随着用户数量的不断增长,如何以低延迟的方式快速解决用户的视频需求对业界来说非常重要。换句话说,根据不同的情况适当分配资源(即媒体)是至关重要的。本文提出了预先制作视频副本并放置在用户(机顶盒)附近的策略。所提出的策略不仅考虑了媒体的受欢迎程度,而且考虑了它的热门时间,即大多数用户访问它的时间段。实验结果表明,采用该策略可以快速处理用户请求,降低整体网络流量负载。
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引用次数: 1
A Fusion Financial Prediction Strategy Based on RNN and Representative Pattern Discovery 基于RNN和代表性模式发现的融合金融预测策略
Lu Zhang, Xiaopeng Fan, Chengzhong Xu
To predicate the future with high accuracy is a holy grail in financial market. However, the volatility of chaotic financial market challenges new technologies from computer science to economic science all the time. Recently, Recurrent Neural Network (RNN) plays a new role in financial market prediction. However, results from RNN are restricted by sample size of training datasets, and show predication accuracy can hardly be guaranteed in a long term. On the other hand, Representative Pattern Discovery (RPD) is an effective way in long-term prediction while it is ineffective in short-term prediction. In this paper, we define a representative pattern for time series, and propose a fusion financial prediction strategy based on RNN and RPD. We take the advantages of both RNN and RPD, in the way that the proposed strategy is stateful to keep the short-term trend and it rectifies the predication by a time-dependent incremental factor in a long-term way. Compared with RNN and pattern discovery respectively, our experimental results demonstrate that our proposed strategy performs much better than that of others. It can increase the prediction accuracy by 6% on the basis of RNN at most, but at a cost of higher Mean Squared Error.
准确预测未来是金融市场的圣杯。然而,混乱金融市场的波动性一直在挑战着从计算机科学到经济科学的新技术。近年来,递归神经网络(RNN)在金融市场预测中发挥了新的作用。然而,RNN的预测结果受到训练数据集样本量的限制,很难保证长期的预测精度。另一方面,代表性模式发现(Representative Pattern Discovery, RPD)在长期预测中是有效的,而在短期预测中是无效的。本文定义了时间序列的代表性模式,提出了一种基于RNN和RPD的融合金融预测策略。我们利用RNN和RPD的优势,所提出的策略是有状态的,以保持短期趋势,并通过长期依赖于时间的增量因素来纠正预测。对比RNN和模式发现,我们的实验结果表明,我们提出的策略比其他策略的性能要好得多。它在RNN的基础上最多能将预测精度提高6%,但代价是均方误差更高。
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引用次数: 6
Models and Run-Time Systems for Data Intensive Workflow Applications 数据密集型工作流应用的模型和运行时系统
N. Haddar, M. Tmar
The paper studies the principal emerged data-centric business process models and workflow systems. Especially, the paper presents a comparative study based on substantial criteria that must be meet in a data-centric process model and its run-time system. This study allows to identify several recommended enhancement in further researches.
本文研究了主要的以数据为中心的业务流程模型和工作流系统。特别地,本文基于以数据为中心的过程模型及其运行时系统必须满足的实质性标准进行了比较研究。这项研究为进一步的研究确定了几种建议的增强方法。
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引用次数: 0
Feature-Based Adaptive Block Partition Method for Data Prefetching in Streamline Visualization 流线可视化中基于特征的自适应分块预取方法
Yumeng Guo, Wenke Wang, Sikun Li
With the increasing size of flow field, a challenge in streamline visualization arises that the memory of calculation node cannot accommodate the entire required data. To solve this problem, out-of-core technique divides the flow field into blocks and read block on demand of computing. Data prefetching is a frequent out-of core method to reduce the affection of the gap between I/O and calculation speed, while the performance is coherent with prefetching hit rate. In this paper, we focus on how to improve the prefetching hit rate to increase the data prefetching efficiency by changing the style of flow field partitioning, and present a novel feature-based dynamic block partition method that divides data to blocks of different sizes. The key of our method is first to compute the feature attributes of the field, and then determine the partitioning points by specific operations to divide feature regions more finely. It is easy to apply our approach to replace block partition part of all state-of-the-art prefetching algorithms. Experimental results show that the major quality measurement of our partitioning strategy for prefetching is much better than the traditional methods, with an increase of about 10%in both prefetch hit rate and effective rate.
随着流场规模的不断扩大,计算节点的内存无法容纳所需的全部数据,这对流线可视化提出了挑战。为了解决这一问题,出芯技术根据计算需要将流场划分为块和读取块。数据预取是一种频繁的出核方法,以减少I/O与计算速度差距的影响,同时性能与预取命中率保持一致。本文重点研究了如何通过改变流场分区方式来提高预取命中率,从而提高数据预取效率,提出了一种基于特征的动态块分区方法,将数据划分为不同大小的块。该方法的关键是首先计算出域的特征属性,然后通过特定的操作确定划分点,从而更精细地划分特征区域。应用我们的方法可以很容易地取代所有最先进的预取算法中的块分割部分。实验结果表明,我们的预取分区策略的主要质量度量比传统方法要好得多,预取命中率和预取效率都提高了约10%。
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引用次数: 3
An Efficient Parallel Optimization for Co-Authorship Network Analysis 一种有效的并行优化合作网络分析方法
C. R. Valêncio, José Carlos De Freitas, Rogéria Cristiane Gratão de Souza, L. A. Neves, G. F. D. Zafalon, A. Colombini, William Tenório
Co-authorship analysis in science and technology partnerships provides a vision of cooperation patterns between individuals and organizations and is still widely used to understand and assess scientific collaboration patterns. This analysis is conducted by means of bibliometry, which is the quantitative study of scientific production. However, with the evolution of database management systems, there was a significant increase in the volume of stored data, which could difficult the analysis. In this context, the developed work presents an efficient parallel optimization of bibliometric information, in order to allow this scientific analysis in a Big Data environment. Our results show that the time taken to calculate the transitivity value using the sequential approach grows 4.08 times faster than the parallel proposed approach when the number of nodes tends to infinity; the time taken to calculate the average distance and diameter values using the sequential approach grows 5.27 times faster than the parallel proposed approach when the number of nodes tends to infinity. Also, the results found present good values of speed up and efficiency.
科学技术伙伴关系中的共同作者分析提供了个人和组织之间合作模式的远景,并且仍然广泛用于理解和评估科学合作模式。这一分析是通过文献计量学的方法进行的,这是对科学生产的定量研究。然而,随着数据库管理系统的发展,存储的数据量显著增加,这可能给分析带来困难。在这种背景下,开发的工作提出了一种有效的并行优化文献计量信息,以便在大数据环境中进行这种科学分析。结果表明,当节点数趋于无穷大时,顺序方法计算传递性值的时间比并行方法快4.08倍;当节点数趋于无穷大时,使用顺序方法计算平均距离和直径值的时间比并行方法快5.27倍。结果表明,该方法具有较好的速度和效率。
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引用次数: 1
Segmentation and Classification of Skin Cancer Melanoma from Skin Lesion Images 皮肤病变图像中皮肤癌黑色素瘤的分割与分类
N. Lynn, Zin Mar Kyu
Melanoma, one type of skin cancer is considered o the most dangerous form of skin cancer occurred in humans. However it is curable if the person detects early. To minimize the diagnostic error caused by the complexity of visual interpretation and subjectivity, it is important to develop a technology for computerized image analysis. This paper presents a methodological approach for the classification of pigmented skin lesions in dermoscopic images. Firstly, the image of the skin to remove unwanted hair and noise, and then the segmentation process is performed to extract the affected area. For detecting the melanoma skin cancer, the meanshift algorithm that segments the lesion from the entire image is used in this study. Feature extraction is then performed by underlying ABCD dermatology rules. After extracting the features from the lesion, feature selection algorithm has been used to get optimized features in order to feed for classification stage. Those selected optimized features are classified using kNN, decision tree and SVM classifiers. The performance of the system was tested and compare those accuracies and get promising results.
黑色素瘤是一种皮肤癌,被认为是发生在人类身上的最危险的皮肤癌。然而,如果发现得早,它是可以治愈的。为了最大限度地减少由于视觉解释的复杂性和主观性而导致的诊断错误,开发一种计算机图像分析技术是很重要的。本文提出了一种在皮肤镜图像中分类色素皮肤病变的方法学方法。首先对皮肤图像进行去除多余毛发和噪声的处理,然后进行分割提取受影响的区域。对于黑色素瘤皮肤癌的检测,本研究采用了从整个图像中分割病灶的meanshift算法。然后根据ABCD皮肤病学规则进行特征提取。从病灶中提取特征后,利用特征选择算法得到优化后的特征,为分类阶段提供信息。选择的优化特征使用kNN、决策树和SVM分类器进行分类。对系统的性能进行了测试,并对这些精度进行了比较,得到了令人满意的结果。
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引用次数: 24
期刊
2017 18th International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)
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