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2013 IEEE 11th International Conference on Dependable, Autonomic and Secure Computing最新文献

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View Oriented Approach to Specify and Model Aerospace Cyber-physical Systems 面向视图的航空信息物理系统指定和建模方法
Lichen Zhang
The analysis and design of aerospace cyber physical systems call for the proper dimensioning of mechanical, electronic and embedded control subsystems from different views. Usually, the physical world part and the cyber part are modeled independently of each others. This modeling approach does not exploit many potential advantages of an integrated specification, analysis and design process, which are lost in the separate points of view of different engineering domains. In fact, the physical properties and the dynamical behavior of physical world parts play a central role in aerospace cyber physical systems development process. Thus, significant improvements to overall system performances can be obtained by early integrating the physical world and the cyber part development. It is clear that an appropriate specification and modeling approach cannot be fitted into the limitations of one formalism at time, particularly in the early stages of the design process. Hence, it is necessary to take a combination of different methodologies in a multi-formalism approach from different views. In this paper, we propose a view oriented approach to integrated different models, at different level of details to specify and model aerospace cyber physical systems as a whole. The effectiveness of the approach is illustrated by means of one practical case study: specifying and modeling the lunar rover system. In this paper, we specify and model the lunar rover with integrating Modelica and AADL, the physical world is modeled by Modelica, the cyber part is modeled by AADL.
航空航天网络物理系统的分析与设计需要从不同的角度对机械、电子和嵌入式控制子系统进行适当的尺寸标注。通常,物理世界部分和网络部分是相互独立的建模。这种建模方法没有利用集成的规范、分析和设计过程的许多潜在优势,这些优势在不同工程领域的独立观点中丢失了。事实上,物理世界部件的物理特性和动力学行为在航空航天网络物理系统的开发过程中起着核心作用。因此,通过早期整合物理世界和网络部分的开发,可以显著提高系统的整体性能。很明显,适当的规格说明和建模方法不能同时适应一种形式主义的限制,特别是在设计过程的早期阶段。因此,有必要从不同的角度,在多形式主义的方法中采取不同方法的组合。在本文中,我们提出了一种面向视图的方法来集成不同的模型,在不同的细节级别来指定和建模航空航天网络物理系统作为一个整体。通过对月球车系统的具体描述和建模,验证了该方法的有效性。本文采用Modelica和AADL相结合的方法对月球车进行了具体的描述和建模,其中物理部分由Modelica建模,网络部分由AADL建模。
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引用次数: 6
A Bounded Polymorphic Session Type System with Delegation 具有委托的有界多态会话类型系统
Tiantian Song, Farong Zhong
Two notions of subtyping and bounded polymorphism have been proposed to increase the expressiveness of session types. In this paper, we propose a new bounded polymorphic type system in which we incorporate the two notions and add delegation to the typing rules. As a result, this system not only can support more flexible specification protocols but also can express high-order communications, i.e. channel passing which can change the structure radically. At last, the soundness of this type system is proved by demonstrating Subject Reduction Theorem and Type Safety.
为了提高会话类型的表达性,提出了子类型和有界多态性两个概念。在本文中,我们提出了一个新的有界多态类型系统,将这两个概念结合起来,并在类型规则中增加委托。因此,该系统不仅可以支持更灵活的规范协议,而且可以表达高阶通信,即可以从根本上改变结构的信道传递。最后,通过主体约简定理和类型安全性证明了该类型系统的正确性。
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引用次数: 0
Optimization Strategies for MPI-Interoperable Active Messages mpi互操作活动消息的优化策略
Xin Zhao, P. Balaji, W. Gropp, R. Thakur
Data-intensive applications, such as those in bioinformatics and social network analysis, differ from traditional scientific applications in that they often involve data-driven and irregular computation/communication patterns, making them ill-suited for traditional data movement approaches. Active Messages (AM) is an alternative programming model that allows dynamically moving computation closer to data, rather than moving the data to the local process. In our previous work, we proposed an MPI-interoperable AM framework that allows existing MPI applications to incrementally take advantage of AM capabilities. While that work presented a baseline implementation of how AMs semantically interact with the rest of the MPI infrastructure, it had several performance shortcomings. In this paper, we analyze these performance shortcomings and propose three optimization strategies: one implicitly derived by the MPI implementation and two explicitly hinted to by the application user. In addition to the detailed description of these optimization strategies, the paper presents a thorough performance evaluation on a 4096-core cluster that demonstrates considerable performance advantages from these strategies.
数据密集型应用,如生物信息学和社会网络分析中的应用,不同于传统的科学应用,因为它们通常涉及数据驱动和不规则的计算/通信模式,使它们不适合传统的数据移动方法。活动消息(Active Messages, AM)是一种可选的编程模型,它允许动态地将计算移动到离数据更近的地方,而不是将数据移动到本地进程。在我们之前的工作中,我们提出了一个MPI互操作的AM框架,该框架允许现有的MPI应用程序逐步利用AM功能。虽然这项工作提供了AMs如何在语义上与MPI基础设施的其余部分交互的基线实现,但它有几个性能缺点。在本文中,我们分析了这些性能缺陷,并提出了三种优化策略:一种是由MPI实现隐式导出的,另两种是由应用程序用户明确暗示的。除了对这些优化策略的详细描述之外,本文还对4096核集群进行了全面的性能评估,证明了这些策略具有相当大的性能优势。
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引用次数: 1
Integrated Network Service to Enhance Multicast Communication 增强组播通信的综合网络业务
Yongkai Zhou, Pengze Guo, Yan Zhu, Zhi Xue, Jianhua Li, Yi Yuan
One of the features of the Software Defined Network (SDN) is to integrate network service into the network layer to better support the application and alleviate the burden of client-server end. Multicast as an efficient communication method, it can be exploited to provide more meaningful network services to applications which involve one-to-many and many-to-many communication. Traditional multicast implementation mainly emphasizes on low network overhead and its function is kept as simple as possible. This makes multicast vulnerable to misuse. However, when network service is integrated into multicast based on the architecture of SDN, the robustness and security of multicast can be enhanced. This paper proposed a detailed implementation of secure network services to enhance the whole process of the multicast communication. Furthermore, the pricing policy is also discussed for different kinds of multicast application scenarios.
软件定义网络(SDN)的特点之一是将网络服务集成到网络层中,以更好地支持应用,减轻客户端-服务器端的负担。多播作为一种高效的通信方式,可以为涉及一对多和多对多通信的应用提供更有意义的网络服务。传统的组播实现主要强调低网络开销,并尽量保持简单的功能。这使得多播容易被误用。但是,基于SDN的架构,将网络业务集成到组播中,可以增强组播的鲁棒性和安全性。本文提出了安全网络服务的详细实现方案,以增强组播通信的全过程。在此基础上,针对不同的组播应用场景,讨论了定价策略。
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引用次数: 0
Automatic Generation Method of Optimization Scheme for Orderly Power Utilization Based on Genetic Algorithm 基于遗传算法的电力有序利用优化方案自动生成方法
J. Huang, Qing-Lin Zuo, Fu-Lin Mu
The orderly power utilization management has become an important way to realize the reasonable distribution of the existing power resources. Currently, the formulation of orderly power utilization scheme mainly depends on the experiences of power experts. When the process has multifarious information and computation burdens, it is hard to formulate the orderly power utilization schemes timely and efficiently only depending on the experts. Hence, this paper proposes an automatic generation method of optimization scheme for orderly power utilization. The method involves the establishment of evaluation index system, calculation models and evaluation function, and searching for optimization scheme through the genetic algorithm. At last the simulation and experimental verification are performed. The results show that the proposed method can provide a powerful reference to the final scheme of orderly power utilization, thus achieving the goal of optimizing the allocation of resources and the maximization of social benefits.
有序的电力利用管理已成为实现现有电力资源合理配置的重要途径。目前,有序用电方案的制定主要依靠电力专家的经验。当该过程具有多种信息和计算负担时,仅依靠专家很难及时有效地制定有序的电力利用方案。为此,本文提出了一种电力有序利用优化方案的自动生成方法。该方法包括建立评价指标体系、计算模型和评价函数,并通过遗传算法寻找优化方案。最后进行了仿真和实验验证。结果表明,所提方法可为电力有序利用的最终方案提供有力参考,从而实现资源优化配置和社会效益最大化的目标。
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引用次数: 3
The Research of Building Multidimensional Multi-granularity Automatic Uncertain Knowledge System Based on Attributes Similarity 基于属性相似度的多维多粒度自动不确定知识系统构建研究
Yanhong Zhang, Lingyu Xu, Jie Yu, Fei Zhong, Yang Liu
Network resources are fully rich, but the source of information is uneven. Huge amount of information, complex diversity of the network information and vastly different perspectives has brought great distress for people to identify information [1]. Due to the complexity of objective things, uncertainty and ambiguity of human thinking and other factors, the actual decision-making information is often difficult to quantify. General choice is to express the decision-making information in the form of qualitative language, but this multi-language form depends on human mind. What's more, different decision-makers will be based on their existing personal experience or cognition degree on the same issue to make good and bad, individualized decision-making, thereby it increases the uncertainty in decision making and labor costs in decision-making process. In this paper, considering the entirety of information on the whole and the drawback of the information on the local, we combine the human knowledge with machine algorithm. The method proposed in this paper is based on the similarity degree of the research object's attributes and categories, which uses the ideas of information fusion [2], make good use of a variety of information together and in view of multidimensional multi-granularity information to confirm each other to find a more effective method to distinguish the similarity measure of information object.
网络资源充分丰富,但信息来源参差不齐。海量的信息、复杂多样的网络信息以及千差万别的视角给人们识别信息带来了极大的困扰[1]。由于客观事物的复杂性、人类思维的不确定性和模糊性等因素,实际的决策信息往往难以量化。一般选择以定性语言的形式来表达决策信息,但这种多语言形式依赖于人的思维。而且,不同的决策者会根据自身已有的个人经验或对同一问题的认知程度,做出好坏不一的个性化决策,从而增加了决策的不确定性和决策过程中的人工成本。在本文中,考虑到整体信息的整体性和局部信息的缺点,我们将人类知识与机器算法相结合。本文提出的方法是基于研究对象的属性和类别的相似度,利用信息融合的思想[2],将多种信息结合在一起,针对多维度的多粒度信息相互确认,找到一种更有效的方法来区分信息对象的相似度度量。
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引用次数: 0
Convergence and Chaos of a Class of Discrete-Time Background Neural Networks with Uniform Firing Rate 一类具有均匀发射速率的离散时间背景神经网络的收敛性和混沌性
Min Wan, Lin Zuo, Yan Li, Jinrong Hu, Qian Luo
The dynamical properties of a class of discrete-time background network with uniform firing rate are investigated. The conditions for stability are derived. To guaranteed the boundness of all trajectories of the discrete-time background network, several invariant sets are obtained. It's then proved that any trajectories of the network starting from each of the invariant sets will converge. In addition to the stability and convergence analysis, bifurcation and chaos are also discussed. It's shown that the network can engender bifurcation and chaos with the increase of background input. The Lyapunov exponents are finally computed to confirm the existence of chaos. Since the background networks originate from the study of the activities of brain and chaotic activities are ubiquitous in the human brain, the chaos analysis of the background networks is significant.
研究了一类具有均匀发射速率的离散背景网络的动力学性质。导出了稳定的条件。为了保证离散时间背景网络所有轨迹的有界性,得到了几个不变量集。然后证明了从每个不变集出发的网络的任何轨迹都是收敛的。除了稳定性和收敛性分析外,还讨论了分岔和混沌问题。研究表明,随着背景输入的增加,网络会产生分岔和混沌。最后计算了李雅普诺夫指数来证实混沌的存在。由于背景网络源于对大脑活动的研究,而混沌活动在人脑中无处不在,因此对背景网络进行混沌分析具有重要意义。
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引用次数: 0
Design of Bitstream Co-processor for Multimedia Applications 多媒体应用中的比特流协处理器设计
Yingke Gao, Huan Ying, Zhiyuan Xue, Tiejun Zhang, Donghui Wang, C. Hou
Variable length coding (VLC) is widely used in the entropy codec part of various video codec standards. Its parallelism is difficult to be developed due to its inherent bit-serial characteristic. As it becomes the system bottleneck of real-time video decoding, this paper presents a bitstream co-processor which greatly accelerates the codec of VLC by designing corresponding bitstream instructions. With SuperV DSP as the research prototype, the area cost of the bitstream co-processor only increases by 1.71% while the performance of the application of entropy decoding is improved about 73% on average.
变长编码(VLC)广泛应用于各种视频编解码标准的熵编解码部分。由于其固有的位串行特性,其并行性难以得到发展。针对实时视频解码成为系统瓶颈的问题,本文提出了一种比特流协处理器,通过设计相应的比特流指令,大大加快了VLC的编解码速度。以SuperV DSP为研究原型,比特流协处理器的面积成本仅增加了1.71%,而熵解码应用的性能平均提高了73%左右。
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引用次数: 0
Semi-supervised Dual Recurrent Neural Network for Sentiment Analysis 面向情感分析的半监督对偶递归神经网络
Wenge Rong, Baolin Peng, Y. Ouyang, C. Li, Z. Xiong
Sentiment analysis is one of the most important challenges to understand opinions online. In this research, inspired by the idea that the structural information among words, phrases and sentences is playing important role in identifying the overall statement's polarity, a novel sentiment analysis model is proposed based on recurrent neural network. The key point of the proposed approach, in order to utilise recurrent character, is to take the partial document as input and then the next parts to predict the sentiment label distribution rather than the next word. The proposed method learns words representation simultaneously the sentiment distribution. Experimental studies have been conducted on commonly used datasets and the results have shown its promising potential.
情感分析是理解网络观点最重要的挑战之一。在本研究中,基于词、短语和句子之间的结构信息在识别语句整体极性方面的重要作用,提出了一种基于递归神经网络的情感分析模型。为了利用循环字符,该方法的关键点是将部分文档作为输入,然后将下一部分作为预测情感标签分布的部分,而不是下一个单词。该方法在学习单词表示的同时学习情感分布。在常用的数据集上进行了实验研究,结果显示了其良好的潜力。
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引用次数: 11
Partially Connected Multi-cell Interference Broadcast Channels Based Iterative Interference Alignment with Imperfect Channel Knowledge 基于不完全信道知识的部分连接多小区干扰广播信道迭代干扰对准
Y. Wang, Zhong-pei Zhang
Interference alignment (IA) has been proved in theory that it can be achievable in a partially connected multi-cell MIMO interfering broadcast channels (IBC) network of arbitrary size, while the signaling dimension of each transmit and receive antennas pair between base station (BS) and user remains bound. For this applicable significance, based on the L-interfering MIMO IBC model, two iterative IA algorithms are presented to solve the alignment problem for this type of network in this paper. Then the feasibility conditions and the impact of channel knowledge imperfection for the proposed algorithms are analyzed. Simulations show that, with a finite antenna number per transmitter and receiver pair, the proposed algorithms can achieve the optimal degrees of freedom (DoF) and can be applied to a partially connected multi-cell MIMO IBC network with arbitrary number of cells and users per cell. Meanwhile, the proposed algorithms are sensitive to imperfect channel knowledge, especially in high SNR region.
理论上证明,在任意大小的部分连接多小区MIMO干扰广播信道(IBC)网络中,在基站与用户之间的每个发射和接收天线对的信令维数不变的情况下,干扰对准(IA)是可以实现的。鉴于这一适用意义,本文基于l - interference MIMO IBC模型,提出了两种迭代IA算法来解决这类网络的对准问题。然后分析了算法的可行性条件和信道知识不完全性对算法的影响。仿真结果表明,在发射器和接收器对天线数量有限的情况下,所提出的算法可以实现最优自由度(DoF),并且可以应用于具有任意小区数量和用户数量的部分连接多小区MIMO IBC网络。同时,该算法对信道知识不完全敏感,特别是在高信噪比区域。
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引用次数: 0
期刊
2013 IEEE 11th International Conference on Dependable, Autonomic and Secure Computing
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