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International Journal of Signal Processing, Image Processing and Pattern Recognition 2012年第4期5卷 43-56页

作者： Wu, Menglin Sun, Quansen Wang, Jin College of Electronics and Information Engineering Nanjing University of Technology Nanjing 211816 China School of Computer Science and Technology Nanjing University of Science and Technology Nanjing 210094 China Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China

Content-based medical image retrieval is an important tool for doctors in their daily activity. In this paper, we propose a novel image retrieval framework to combine visual concept and local features. To obtain visual semantic representation of the image, we first construct a graph model by feature distance and density similarity, and then a graph-based semi-supervised learning method is applied to get the membership degree of query images. Meanwhile, the dense SIFT feature of the image patches is extracted and described by bag of visual words as local features. Besides, we design a similarity measurement based on visual concept and local feature rather than using low level features only. We evaluate the proposed algorithm in ImageCLEFmed dataset. The results demonstrate that our method represents the visual semantic of images effectively, and compares favorably to state-of-the-art approaches based on single low level features in retrieval performance.

关键词： Graphic methods

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Extracting regular behaviors from social media networks

Extracting regular behaviors from social media networks

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3rd International Conference on Multimedia Information networking and Security, MINES 2011

作者： Yan, Leiming Wang, Jinwei School of Computer and Software Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing China

ISBN: (纸本)9780769545592

Social media network analysis has become very popular in recent years. How do real networks evolve over time? What are the normal evolving behaviors in a social media network? In order to extract behaviors occurring regularly to reveal the microscopic evolving properties in social networks, the evolving process of networks is modeled as stochastic states transition, and the evolving behaviors are described as topological structure changes of a series of sub graphs. Then, based on Maximal Frequent Sub graph mining technology, RB Miner (Regular Behaviors Miner) algorithm is proposed to identify such regular behaviors in network dataset. The empirical evaluation using both synthetic and real dataset verifies that the proposed algorithm is valid, and the regular behavior patterns show more dynamic information hidden in evolving social networks than normal frequent sub graph patterns. © 2011 IEEE.

关键词： Miners

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A context-aware protocol for location discovery exchange in a ubiquitous environment

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous engineering 2012年第2期7卷 177-182页

作者： Liu, Qi Linge, Nigel Gao, Feng Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China Computer Networking and Telecommunications Research Centre University of Salford Salford Greater Manchester M5 4WT United Kingdom School of Information Science and Technology Shijiazhuang Tiedao University Nanjing 050043 China

Due to the dynamic nodes' movement and their interaction, it is challenged to represent, discover and exchange location information in a ubiquitous environment. In this paper, we present a new approach to location information awareness that organizes the format of nodes' location information and maintains the communication between direct nodes in a ubiquitous environment. The structure of Context information Base (CiB) and Context information Communication protocol (CiComm) is manipulated to implement the proposed features.

关键词： Ubiquitous computing

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Algorithm of webpage information hiding based on redefinition of CSS class selectors

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Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology 2012年第SUPPL.1期36卷 31-36页

作者： Wang, Bao-Wei Sun, Xing-Ming Xia, Zhi-Hua Yu, Jiang Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China PLA 73691 Unit Nanjing 210014 China

The existing algorithms of webpage information hiding have the common shortcoming that the embedding rule is not tightly integrated with the content and the structure of the webpage, and lacks the ability to resist analysis and automatic filtering. Based on the redefinition of cascading style sheets(CSS) class, a novel webpage information hiding algorithm is proposed. The CSS class with the same declarations and a similar but not identical selector are redefined. By changing the class selectors used in the webpage, the secret information is embedded into the webpage. The experimental results show that the algorithm does not affect the webpage display and introduce any specific markers, and has good ability to resist analysis and auto filtration. The improved scheme has controllable embedding capacity and higher security to meet different needs. It can be used in the webpage protection and covert communication.

关键词： Websites

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Combining active learning and semi-supervised for improving learning performance 11

Combining active learning and semi-supervised for improving ...

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4th International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL'11

作者： Ma, Tinghuai Ge, Jian Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing Jiangsu Province China School of Computer and Software Nanjing University of Information Science and Technology Nanjing Jiangsu Province China

ISBN: (纸本)9781450309134

In many learning tasks, there are abundant unlabeled samples but the number of labeled training samples is limited, because labeling the samples requires the efforts of human annotators and expertise. There are three major techniques for labeling the samples: semi-supervised learning, transductive learning and active learning. Semi-supervised and transductive learning deal with methods for automated exploiting unlabeled samples in addition to improve learning performance. Active learning deals with methods that assume the learner has control over the whole input space. So combing the advantage of semi-supervised learning and active learning is a practical technique for improving the learning performance. In this paper, a general framework of combing (Active Learning) AL and (Semi-Supervised Learning) SSL algorithms is proposed. Then the ensemble learning for combing AL and SSL algorithms is introduced, which is denoted by ASC (AL and SSL by Committee). At last, the ensemble learning and confidence measure of the ASC is discussed. © 2011 ACM.

关键词： Learning algorithms

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Hybrid multiplicative watermarking and its decoders

Hybrid multiplicative watermarking and its decoders

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3rd International Conference on Multimedia Information networking and Security, MINES 2011

作者： Wang, Jinwei Lian, Shiguo Yan, Leiming Wang, Yuxiang Jiangsu Engineering Center of Network Monitoring School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China Beijing Beijing 10080 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China

ISBN: (纸本)9780769545592

With the rapid development and the richer content of the Internet, the copyright protection of the works should be further developed. The watermarking has become a possible solution. In this paper, firstly, a novel hybrid multiplicative rule is presented and utilized to embed the watermark into DWT coefficients controlled by the secret key. Secondly, the optimum and locally optimum hybrid multiplicative multi-watermarking decoders are proposed, respectively, which are based on the minimum Bayesian risk criterion. The DWT coefficients are modeled as the generalized Gaussian distribution. Nextly, the performance of the optimum hybrid watermarking decoder, i.e. the average bit error rate is theoretically analyzed. Then the security of the hybrid multiplicative watermarking scheme is compared with the existing schemes. Finally, experimental results prove the theoretical analysis valid. © 2011 IEEE.

关键词： Watermarking

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A robust instantaneous frequency estimation of rotating machinery

A robust instantaneous frequency estimation of rotating mach...

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2011 International Conference on Mechatronic Science, Electric engineering and computer, MEC 2011

作者： Zhao, Xiaoping Zhao, Xiuli Zheng, Yuhui Xie, Shengdong Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China Hebei Software Institute Baoding 071000 China

ISBN: (纸本)9781612847221

The problem of estimating and tracking the fundamental frequency of a periodic signal is formulated in short Fourier transform and viterbi algorithm (STFT-VA) is proposed. An improvement to peak search is proposed, which can avoid strong non-order components or noises disturbing to the peak search work Compare with traditional methods of order tracking instantaneous frequency estimation (IFE) based on order tracking is simplified in application an only software depended. The method is tested on a multichannel vibration measurement from the rotating machinery. From the measurements the running speed of the engine is successfully estimated during the run-up/down experiment. © 2011 IEEE.

关键词： Viterbi algorithm

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Order tracking based on Gabor and Viterbi algorithm

Order tracking based on Gabor and Viterbi algorithm

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2011 International Conference on Mechatronic Science, Electric engineering and computer, MEC 2011

作者： Zhao, Xiaoping Zhao, Xiuli Wang, Yan Zheng, Yuhui Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China Hebei Software Institute Baoding 071000 China School of Electrical Engineering and Information Anhui University of Technology Maanshan China

ISBN: (纸本)9781612847221

The study proposes an improved Gabor order tracking technique based on Viterbi algorithm (V-GOT) to cope with close orders and crossing orders that cannot be effectively separated by using the original Gabor order tracking scheme. The dual function of the Gabor elementary function can effect the precision of tracked orders. In the paper, its influence on the computed Gabor expansion coefficients is investigated. For applying V-GOT in practical works, the separation and extraction of close orders components of vibration signals measured from an aircraft engine test is illustrated. © 2011 IEEE.

关键词： Viterbi algorithm

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Extracting Regular Behaviors from Social Media networks

Extracting Regular Behaviors from Social Media Networks

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International Conference on Multimedia Information networking and Security (MINES)

作者： Leiming Yan Jinwei Wang School of Computer & Software Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing China

关键词： Social network services Data mining Media Electronic mail Databases Markov processes

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The Research of Acceptance and Scheduling Scheme Based on the Overall network QoS

The Research of Acceptance and Scheduling Scheme Based on th...

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The 2011 International Conference on Instrumentation, Measurement, Circuits and Systems(ICIMCS 2011)

作者： Xu Zhanyang Huang Li Ping Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science & Technology School of Computer & Software Nanjing University of Information Science & Technology

Many factors affect the QoS of network, and the congestion control mechanism is the most important one. In many references, the research on QoS is focused on the specific network architecture, while the QoS of overall network is still relatively seldom studied. In the paper, an acceptance and scheduling scheme based on the overall network QoS(ASSo Qo S) proposed is a new acceptance and scheduling algorithm of the link traffic. At first, the data stream with the admission control strategy will be distributed in different weights, the data flow will get the link(with different weight) transmission scheduling to improve the overall network QoS, according to the allocated weight of a network link and status by real-time network monitoring.

关键词： Acceptance,scheduling,QoS

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