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Traffic sign classification base on latent dirichlet allocation 1

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6th International Conference on Frontier computing, FC 2017

作者： Song, Lei Liu, Zheyuan Zhang, Xiaoteng Duan, Huixian Liu, Na Dai, Jie The Third Research Institute of the Ministry of Public Security Shanghai China The Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai China Shanghai International Technology and Trade United Co. Ltd Shanghai China

ISBN: (数字)9789811073984

ISBN: (纸本)9789811073977

Traffic sign classification is a significant issue in the intelligent vehicle domain, which helps vehicles to follow the traffic rules and ensure the safety. Feature selection and description are very important and difficult for classification. In this paper, a novel traffic sign classification method is proposed which is based on the Latent Dirichlet Allocation (LDA) model. Feature topics are modeled based on various traffic signs by the LDA automatically. And traffic signs captured onboard are classified according to the modeled features. The experiment results show the efficiency of our work. © 2018, Springer Nature Singapore Pte Ltd.

关键词： Traffic signs

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Finite-time Cluster Synchronization of Complex Networks With Time-Varying Delays

Finite-time Cluster Synchronization of Complex Networks With...

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第28届中国控制与决策会议

作者： Xiwei Liu Shaohua Li Department of Computer Science and Technology Tongji University The Key Laboratory of Embedded System and Service Computing Ministry of Education

ISBN: (纸本)9781467397155

In this paper,we study the finite-time cluster synchronization of complex networks with time *** are two different types of time-varying delays in the network:the internal time delay and the coupling ***'s more,we assume that coupling time-varying delays exist only between nodes in different clusters,while no delay happens between nodes in the same cluster,which is more consistent with the real *** on the Lyapunov stability theorem,sufficient conditions are derived to guarantee the realization of the finite-time cluster ***,numerical simulations are provided to support the obtained theoretical results.

关键词： Complex network Cluster synchronization Finite-time Time-varying delays

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Lag Quasi-synchronization of Nonlinear Coupled Networks via Aperiodically Intermittent Pinning Control

Lag Quasi-synchronization of Nonlinear Coupled Networks via ...

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第27届中国控制与决策会议

作者： Xiwei Liu Ying Liu Department of Computer Science and Technology Tongji Universityand with the Key Laboratory of Embedded System and Service ComputingMinistry of Education

ISBN: (纸本)9781479970186

The lag quasi-synchronization of nonlinear coupled networks with time-varying delay in the presence of parameter mismatches by using aperiodically intermittent pinning control is investigated in this *** paper has two main differences with previous works:one is that the type of the intermittent pinning control is aperiodic while that in previous works is periodic;the other is that the coupling function we choose is *** utilizing the aperiodically intermittent pinning control idea,we pin the coupled networks by a simple controller to achieve the lag *** sufficient criteria are obtained to guarantee lag *** last,some simulations are presented to verify the correctness of the obtained theoretical results.

关键词： Aperiodic Intermittent Lag Nonlinear coupling Quasi-synchronization

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Pinning Control of Complex Networks With Unbounded Time-Varying Delays

Pinning Control of Complex Networks With Unbounded Time-Vary...

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第27届中国控制与决策会议

作者： Xiwei Liu Yuan Xu Department of Computer Science and Technology Tongji Universityand with the Key Laboratory of Embedded System and Service ComputingMinistry of Education

The pinning control problem of directed complex dynamical networks with unbounded time-varying delays is investigated in this *** related works investigate the synchronization without any external control;while in this paper,external pinning control is added on the network,and this is the main difference between this paper and previous *** order to realize the synchronization,we design a simple controller to pin the *** sufficient criteria are deduced from the method of linear matrix inequality(LMI).Finally,the correct of our theoretical results is verified by numerical examples.

关键词： Complex networks Pinning control Synchronization Time-varying Unbounded delay

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DAG-Aware Joint Task Scheduling and Cache Management in Spark Clusters

DAG-Aware Joint Task Scheduling and Cache Management in Spar...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Yinggen Xu Liu Liu Zhijun Ding The Key Lab of Embedded System and Service Computing Tongji University Shanghai China

ISBN: (数字)9781728168760

ISBN: (纸本)9781728168777

Data dependency, often presented as directed acyclic graph (DAG), is a crucial application semantics for the performance of data analytic platforms such as Spark. Spark comes with two built-in schedulers, namely FIFO and Fair scheduler, which do not take advantage of data dependency structures. Recently proposed DAG-aware task scheduling approaches, notably GRAPHENE, have achieved significant performance improvements but paid little attention to cache management. The resulted data access patterns interact poorly with the built-in LRU caching, leading to significant cache misses and performance degradation. On the other hand, DAG-aware caching schemes, such as Most Reference Distance (MRD), are designed for FIFO scheduler instead of DAG-aware task *** this paper, we propose and develop a middleware Dagon, which leverages the complexity and heterogeneity of DAGs to jointly execute task scheduling and cache management. Dagon relies on three key mechanisms: DAG-aware task assignment that considers dependency structure and heterogeneous resource demands to reduce potential resource fragmentation, sensitivity-aware delay scheduling that prevents executors from long waiting for tasks insensitive to locality, and priority-aware caching that makes the cache eviction and prefetching decisions based on the stage priority determined by DAG-aware task assignment. We have implemented Dagon in Apache Spark. Evaluation on a testbed shows that Dagon improves the job completion time by up to 42% and CPU utilization by up to 46% respectively, compared to GRAPHENE plus MRD.

关键词： Task analysis Delays Sparks Data analysis Graphene Complexity theory Sensitivity

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Research on Practical Implementation of Binary Arithmetic Coding with Forbidden Symbol for Error Resilience

Research on Practical Implementation of Binary Arithmetic Co...

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2011 International Conference on Frontiers in Computer Education(ICFCE 2011)

作者： Wei Zhang Feng Cen Fanglai Zhu The Key Laboratory of Embedded System and Service Computing Ministry of Education Department of Control Science & Engineering Tongji University

Arithmetic coding is a widely applied compression tool with superior coding efficiency to other entropy coding methodsHowever, it suffers from the error resilience and complexityIn this paper, the integer implementation of binary arithmetic coding with forbidden symbol for error resilience is studiedCoding redundancies for employing different quantization coefficients in probability representation and cost effective backtracking distance in bits for maximum a posteriori(MAP) decoding are studied in depthWe observe that the optimal quantization coefficients are independent of forbidden symbol and the probabilities of source and the cost effective backtracking distance is related to the source entropy and the given forbidden symbol probabilitiesSuch observations are also demonstrated by extensive experiments.

关键词： Arithmetic coding Forbidden symbol Error resilience MAP

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Synchronization of Multi-Weighted and Directed Network Under Pinning Impulsive Control

Synchronization of Multi-Weighted and Directed Network Under...

引用

Chinese Automation Congress (CAC)

作者： Xiaohan Hu Xiwei Liu Tongji University Shanghai China Key Laboratory of Embedded System and Service Computing Tongji University Shanghai China

ISBN: (纸本)9781665426480

In this paper, multi-weighted and directed complex dynamic networks (MWDCDNs) under the control of hybrid impulses are analyzed. Two cases are considered. In the first case, impulses can be only applied on one fixed node. In the other case, impulses are applied on different nodes according to whether they are synchronized or de-synchronized in MWDCDNs with unbounded time delay. By limiting impulsive interval and Chebyshev distance between the normalized left eigenvectors (NLEVec) of multiple coupling matrices corresponding to the zero eigenvalue, we obtain some criteria for the synchronization of MWDCNs. Some numerical simulation are also given.

关键词： Couplings Sufficient conditions Limiting Automation Delay effects Chebyshev approximation Numerical simulation

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Information Security Evaluation by Information Flow Analysis Based on Stochastic Petri Nets

Information Security Evaluation by Information Flow Analysis...

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2024 IEEE International Conference on systems, Man, and Cybernetics, SMC 2024

作者： Tu, Hanqian Xiang, Dongming Lin, Wang Liu, Guanjun Zhejiang Sci-Tech University Department of Computer Science and Technology Hangzhou310018 China Shanghai Electronic Transactions and Information Service Collaborative Innovation Center Tongji University Key Laboratory of Embedded System and Service Computing Ministry of Education Department of Computer Science Shanghai201804 China

ISBN: (纸本)9781665410205

The Petri-net-based information flow analysis offers an effective approach for detecting information leakage by the concept of non-interference. Although the related studies propose efficient solutions, they lack quantitative evaluation on information leakage. In this paper, we propose a novel method for quantitative evaluation of information security based on stochastic labeled Petri nets (SLPNs) and information flow analysis. Specifically, we introduce four different levels of security metrics, and provide a methodology for evaluating the information security. Furthermore, a case study is presented to show the feasibility of our method. © 2024 IEEE.

关键词： Information leakage

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Effectively compressing Near-Duplicate Videos in a joint way

Effectively compressing Near-Duplicate Videos in a joint way

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Hanli Wang Ming Ma Tao Tian Key Laboratory of Embedded System and Service Computing Tongji University Shanghai P. R. China

With the increasing popularity of social network, more and more people tend to store and transmit information in visual format, such as image and video. However, the cost of this convenience brings about a shock to traditional video servers and expose them under the risk of overloading. Among the huge amount of online videos, there are quite a number of Near-Duplicate Videos (NDVs). Although many works have been proposed to detect NDVs, few researches are investigated to compress these NDVs in a more effective way than independent compression. In this work, we utilize the data redundancy of NDVs and propose a video coding method to jointly compress NDVs. In order to employ the proposed video coding method, a number of pre-processing functions are designed to explore the correlation of visual information among NDVs and to suit the video coding requirements. Experimental results verify that the proposed video coding method is able to effectively compress NDVs and thus save video data storage.

关键词： Videos Video coding Image coding Bit rate Joints Indexes Encoding

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Finite time cluster consensus of fractional-order multi-agent systems with directed topology

Finite time cluster consensus of fractional-order multi-agen...

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第33届中国控制与决策会议

作者： Weijin Liu Xiwei Liu Department of Computer Science and Technology Tongji University Key Laboratory of Embedded System and Service Computing Ministry of Education

In this paper,the finite time cluster consensus(FnTCC) of fractional-order multi-agent systems(FOMAS)with directed topology is *** fractional-order system is converted into an integer-order system by defining a neighborhood-based error variable,and suitable control rules are designed for the obtained first-order multi-agent *** to the exponential finite-time stability theorem,suitable Lyapunov functions are ***,the settling time function is *** simulation results prove the feasibility and validity of our theory.

关键词： Fractional-order Cluster consensus Exponential finite time Multi-agent systems Directed topology

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