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International Conference on computer and information Science (ACIS)

作者： Yong Xie Xin Su Yifan He Xuhui Chen Gengliang Cai Baisheng Xu Wenjia Ye Department of Computer and Information Engineering Xiamen University of Technology Xiamen R.P. China Hunan Provincial Key Laboratory of Network Investigational Technology Hunan Police Academy Changsha R.P. China Department of Electrical Engineering Eindhoven University of Technology The Netherlands

ISBN: (纸本)9781509055081

As the new era of the Internet of Things(IoT) is driving the evolution of conventional Vehicle Ad-hoc Networks into the Internet of Vehicles(IoV), vehicles are equipped with different kinds of sensor and become a sensing node themselves in IoV. Consequently, complexity of the automotive electronic system inside the vehicles are daily increasing. To guarantee the safe operation of vehicles, it is of great significance to acquire vehicle data in real-time to realize the on-line diagnosis, cybersecurity attacking detection and et al. In this paper, we propose to realize a STM32-based data acquisition system(DAS), where the vehicle data transferred on CAN networks are acquired through the OBD2(On-Broad Diagnosis) interface. And then, the acquired vehicle data are parsed and analyzed preliminarily according to the OBD2 protocol, and then shown on a LED displayer. Through the implementation of a prototype system, the feasibility and effectiveness of the proposed design of DAS is verified.

关键词： Data acquisition Protocols ISO Standards Real-time systems Automobiles Liquid crystal displays Internet

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Illumination insensitive efficient second-order minimization for planar object tracking

Illumination insensitive efficient second-order minimization...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Lin Chen Fan Zhou Yu Shen Xiang Tian Haibin Ling Yaowu Chen Institute of Advanced Digital Technology and Instrument Zhejiang University China Key Laboratory for Biomedical Engineering of Ministry of Education of China Zhejiang University China Meitu HiScene Lab HiScene Information Technologies Shanghai China Zhejiang Provincial Key Laboratory for Network Multimedia Technologies Hangzhou China Computer & Information Sciences Department Temple University USA

Tracking for planar objects is an important issue to vision-based robotic applications. In direct visual tracking (DVT) methods, the similarity between two images is often measured through the sum of squared differences (SSD) especially with the efficient second-order minimization (ESM) due to its simplicity and efficiency. However, SSD-based ESM is not robust to illumination changes since it is usually built upon the brightness constancy assumption. Contrast to image brightness, gradient orientations (GO) are invariant to both linear and non-linear illumination changes as verified in practice. Based on GO, we propose an illumination insensitive ESM method for planar object tracking in this paper. In order to introduce GO into the ESM, we generalized the original ESM formulas for multi-dimensional features. In addition, a denoising method based on the Perona-Malik function and a mask image were suggested to improve GO's robustness against image noise and low texture. Our experimental results on dataset for planar objects with illumination changes and a benchmark dataset confirm the proposed method is robust to illumination variations and capable to deal with the general tracking challenges.

关键词： Lighting Robustness Jacobian matrices Visualization Brightness Minimization Object tracking

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Dynamic Adaptation of Duty Cycling with MAC Parameters in Cluster Tree IEEE 802.15.4 Networks

Dynamic Adaptation of Duty Cycling with MAC Parameters in Cl...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Nikumani Choudhury Rakesh Matam Mithun Mukherjee Lei Shu Department of Computer Science & Engineering Indian Institute of Information Technology Guwahati India Guangdong Provincial Key Laboratory of Petrochemical Equipment Fault Diagnosis Guangdong University of Petrochemical Technology Maoming China School of Engineering University of Lincoln Lincoln U.K.

The IEEE 802.15.4 standard does not allow to make dynamic adjustments to the inactive portion of the superframe, thus affecting the duty cycles of the coordinator and all the devices attached to it. Prior works in this direction are either based on superframe occupation ratio or buffer occupancy/queue length of the transmitting nodes. In this paper, we present the respective limitations of both these schemes that lead to sub-optimal MAC parameter (BO and SO) settings and later propose a dynamic duty cycling mechanism based on MAC parameters (macMinBE, macMaxCSMABackoffs and macMaxFrameRetries). A Markov model is developed for IEEE 802.15.4 CSMA-CA that is used to analytically estimate the delay and energy consumption during transmission of frames using the MAC parameters.

关键词： IEEE 802.15 Standard Markov processes Delays Energy consumption Peer-to-peer computing Network topology

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Multiway Dynamic Trust Chain Model on Virtual Machine for Cloud Computing

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China Communications 2016年第7期13卷 83-91页

作者： Jie Zhu Guoyuan Lin Fucheng You Huaqun Liu Chunru Zhou School of Computer Science and Technology China University of Mining&TechnologyXuzhou 221116China State Key Laboratory for Novel Software Technology hosted at Nanjing University Nanjing 210093China Information Engineering School of Beijing Institute of Graphic Communication Beijing 102600China Beijing Key Laboratory of Signal and Information Processing for High-end Printing Equipment Beijing Institute of Graphic CommunicationBeijing 100026China Information Security Center Beijing University of Posts and TelecommunicationsBeijing 100876China Nanjing University of Information Science&Technology Nanjing 210044China

This paper sums up four security factors after analyzing co-residency threats caused by the special multitenant environment in the *** secure the factors,a multiway dynamic trust chain transfer model was proposed on the basis of a measurement interactive virtual machine and current behavior to protect the integrity of the system.A trust chain construction module is designed in a virtual machine *** dynamic monitoring,it achieves the purpose of transferring integrity between virtual machine.A cloud system with a trust authentication function is implemented on the basis of the model,and its practicability is shown.

关键词： cloud computing virtual machine trustworthiness measurement dynamic trust transfer

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Impact of Synchronization Scheme on Duty Cycling in IEEE 802.15.4 Cluster Tree Networks

Impact of Synchronization Scheme on Duty Cycling in IEEE 802...

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Annual Conference of the IEEE Industrial Electronics Society

Duty-cycling schemes allow devices to dynamically adjust their active period to conserve energy. On the other hand, synchronization schemes allow multiple coordinators to schedule their transmissions in order to prevent the overlapping of superframe schedules. In this paper, we analyze the impact of a synchronization mechanism on duty-cycling schemes in an IEEE 802.15.4 cluster tree network. We show the necessity of an operational synchronization mechanism when devices adopt an independent duty-cycling approach so that the later accounts to effective energy savings.

关键词： Synchronization Schedules IEEE 802.15 Standard Network topology Propagation losses Data communication

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Turbulence mitigation scheme based on multiple-user detection in an orbital-angular-momentum multiplexed system

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Chinese Physics B 2016年第11期25卷 316-323页

作者：邹丽王乐赵生妹陈汉武 Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications School of Electronics and Information Nantong University Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications School of Computer Science and Engineering College of Software Engineering Southeast University

Atmospheric turbulence（AT） induced crosstalk can significantly impair the performance of a free-space optical（FSO）communication link using orbital angular momentum（OAM） *** this paper,we propose a multiple-user detection（MUD） turbulence mitigation scheme in an OAM-multiplexed FSO communication ***,we present a MUD equivalent communication model for an OAM-multiplexed FSO communication link under *** the equivalent model,each input bit stream represents one user＇s *** deformed OAM spatial modes caused by AT,instead of the pure OAM spatial modes,are used as information carriers,and the overlapping between the deformed OAM spatial modes are computed as the correlation coefficients between the ***,we present a turbulence mitigation scheme based on MUD idea to enhance AT tolerance of the OAM-multiplexed FSO communication *** the proposed scheme,the crosstalk caused by AT is used as a useful component to deduce users＇ *** numerical results show that the performance of the OAM-multiplexed communication link has greatly improved by the proposed *** the turbulence strength C_n^2 is 1 × 10^（-15） m^（-2/3）,the transmission distance is 1000 m and the channel signal-to-noise ratio（SNR）is 26 dB,the bit-error-rate（BER） performance of four spatial multiplexed OAM modes l_m = ＋ 1,＋2,＋3,＋4 are all close to 10-5,and there is a 2-3 fold increase in the BER performance in comparison with those results without the proposed *** addition,the proposed scheme is more effective for an OAM-multiplexed FSO communication link with a larger OAM mode topological charge *** proposed scheme is a promising direction for compensating the interference caused by AT in the OAM-multiplexed FSO communication link.

关键词： turbulence mitigation momentum angular deformed crosstalk topological multiplexing orbital turbulent

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Secrecy performance analysis of single-input multiple-output generalized-K fading channels

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Frontiers of information technology and Electronic Engineering 2016年第10期17卷 1074-1084页

作者： Lei, Hong-jiang Ansari, Imran Shafique Gao, Chao Guo, Yong-cai Pan, Gao-feng Qaraqe, Khalid A. Chongqing Key Laboratory of Mobile Communications Technology Chongqing University of Posts and Telecommunications Chongqing400065 China MOE Key Laboratory of Optoelectronic Technology and Systems Chongqing University Chongqing400044 China Department of Electrical and Computer Engineering Texas A&M University at Qatar Doha Qatar Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing Southwest University Chongqing400715 China

In this paper, the transmission of confidential messages through single-input multiple-output (SIMO) independent and identically generalized-K (KG) fading channels is considered, where the eavesdropper overhears the transmission from the transmitter to the receiver. Both the receiver and the eavesdropper are equipped with multiple antennas, and both active and passive eavesdroppings are considered where the channel state information of the eavesdropper’s channel is or is not available at the transmitter. The secrecy performance of SIMO KG systems is investigated. Analytical expressions for secrecy outage probability and average secrecy capacity of SIMO systems are derived via two different methods, in which KG distribution is approximated by the Gamma and mixture Gamma distributions, respectively. Numerical results are presented and verified via the Monte-Carlo simulation. © 2016, Journal of Zhejiang University Science Editorial Office and Springer-Verlag Berlin Heidelberg.

关键词： Fading channels

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A constrained sparse representation approach for video anomaly detection

A constrained sparse representation approach for video anoma...

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2016 IEEE Advanced information Management,Communicates,Electronic and Automation Control Conference(IMCEC 2016)

作者： Yugen Yi Xiaohui Li Rui Zhao Chao Bi Jianzhong Wang Hui Sun School of Software Jiangxi Normal University College of Computer Science and Information Technology Key Laboratory of Intelligent Information Processing of Jilin UniversitiesNortheast Normal University College of Humanities and Sciences Northeast Normal University

ISBN: (纸本)9781509001668

Sparse representation based anomaly detection algorithms have received a widely interest in recent ***,most of the existing approaches fail to pay attention to the manifold structure of the video data,which has been pointed to be important for data *** overcome this limitation,we develop a new sparse coding algorithm named constrained sparse representation(CSR) for video anomaly detection,which explicitly takes the manifold structure of data into *** assumes that each sample's sparse coding coefficient can be linearly reconstructed by the coding coefficients of its ***,CSR algorithm can obtain relatively smoothly sparse representations along the manifold of *** apply the proposed CSR model to video abnormal event detection task and conduct extensive experiments on the UMN *** experimental results demonstrate that our proposed CSR model performed better than some related algorithms.

关键词： local geometrical structure sparse representation abnormal event detection

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Future Development Trend of Multimedia Network

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IOP Conference Series: Materials Science and Engineering 2018年第1期466卷

作者： Li Huang Kai Zhang Wei Hu Chengcheng Li College of Computer Science and Technology Wuhan University of Science and Technology Hubei Wuhan 430081 China Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan University of Science and Technology Hubei Wuhan 430081 China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Hubei Wuhan 430081 China

With the rapid development of computer network, multimedia technology has gradually spread throughout all aspects of people's life. This article, based on the concept and characteristics of multimedia, expounds the application of multimedia technology and the trend of future development. It makes a heavy analysis of multimedia teaching and analyses the meaning and advantage of multimedia teaching.

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Pigmented skin lesion detection using random forest and wavelet-based texture 7

Pigmented skin lesion detection using random forest and wave...

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Optics in Health Care and Biomedical Optics VII

作者： Hu, Ping Yang, Tie-Jun College of Information Science and Engineering Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Spatial Information and Geometrics Guilin University of Technology Guilin541004 China Guangdong Provincial Key Laboratory of Digital Signal and Image Processing Techniques Shantou University Shantou515063 China

ISBN: (纸本)9781510604674

The incidence of cutaneous malignant melanoma, a disease of worldwide distribution and is the deadliest form of skin cancer, has been rapidly increasing over the last few decades. Because advanced cutaneous melanoma is still incurable, early detection is an important step toward a reduction in mortality. Dermoscopy photographs are commonly used in melanoma diagnosis and can capture detailed features of a lesion. A great variability exists in the visual appearance of pigmented skin lesions. Therefore, in order to minimize the diagnostic errors that result from the difficulty and subjectivity of visual interpretation, an automatic detection approach is required. The objectives of this paper were to propose a hybrid method using random forest and Gabor wavelet transformation to accurately differentiate which part belong to lesion area and the other is not in a dermoscopy photographs and analyze segmentation accuracy. A random forest classifier consisting of a set of decision trees was used for classification. Gabor wavelets transformation are the mathematical model of visual cortical cells of mammalian brain and an image can be decomposed into multiple scales and multiple orientations by using it. The Gabor function has been recognized as a very useful tool in texture analysis, due to its optimal localization properties in both spatial and frequency domain. Texture features based on Gabor wavelets transformation are found by the Gabor filtered image. Experiment results indicate the following: (1) the proposed algorithm based on random forest outperformed the-state-of-the-art in pigmented skin lesions detection (2) and the inclusion of Gabor wavelet transformation based texture features improved segmentation accuracy significantly. © 2016 SPIE.

关键词： Decision trees

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