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检索条件"主题词=change detection algorithms"

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Accurate DCA Algorithm for TCP Congestion Avoidance

Accurate DCA Algorithm for TCP Congestion Avoidance

引用

IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： Mengqin Xia Fasheng Yi Yan Wang Jiazhi Zeng School of Computer Science and Engineering University of Electronic Science and Technology Chengdu China

This paper represents an accurate delay-based congestion avoidance (ADCA) algorithm. It eliminates the void components of round-trip time (RTT), which is used as main parameter in delay-based congestion avoidance (DCA) algorithm. ADCA improves TCP throughput and efficiency comparing to the normal DCA algorithm, such as TCP Vegas. Simulations show that ADCA detects network circumstance more exactly and enhances TCP efficiency obviously.

关键词： Bandwidth Delay effects Throughput IP networks change detection algorithms Computer science Internet Telecommunication traffic Phase detection Wireless networks

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Video cut detection in E-Learning applications

Video cut detection in E-Learning applications

引用

International Symposium on Signal Processing and Its Applications (ISSPA)

作者： S. Koohi M. Babagoli T. Lotfi S. Kasaei Sharif University of Technology Tehran Iran

ISBN: (纸本)9781424407781;1424407796

Real-time video transmission is considered as an important means for information distribution. One major application of it is e-learning, which requires real-time video processing and transmission. On the other hand, the process of cut detection is a fundamental component in automatic video browsing, indexing, searching, retrieval, and archiving. This paper introduces a new video cut detection technique that uses dominant lines and angles extracted from edge information of the video contents. To the best of our knowledge, it is the first works done for cut detection in e-learning application. This method is compatible with our applicationpsilas requirements and has a low complexity and high speed. We have compared the performance of our proposed method against three established techniques and have evaluated the results using different video sequences.

关键词： Electronic learning Cameras Gunshot detection systems change detection algorithms Indexing Video sequences Algorithm design and analysis detection algorithms Lighting Robustness

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Continuous Tracking of User Emotion in Mandarin Emotional Speech

Continuous Tracking of User Emotion in Mandarin Emotional Sp...

引用

International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Tsang-Long Pao Charles S Chien Jun-Heng Yeh Yu-Te Chen Yun-Maw Cheng Department of Computer Science and Engineering Tatung University Taiwan School of Management and Development Feng Chia University FCU Taiwan

ISBN: (纸本)9780769529943;0769529941

Emotions play a significant role in decision-making, healthy, perception, human interaction and human intelligence. Automatic recognition of emotion in speech is very desirable because it adds to the human- computer interaction and becomes an important research area in the last years. However, to the best of our knowledge, no works have focused on automatic emotion tracking of continuous Mandarin emotional speech. In this paper, we present an emotion tracking system, by dividing the utterance into several independent segments, each of which contains a single emotional category. Experimental results reveal that the proposed system produces satisfactory results. On our testing database composed of 279 utterances which are obtained by concatenating short sentences, the average accuracy achieves 83% by using weighted D-KNN classifier and LPCC and MFCC features.

关键词： Emotion recognition Humans Speech recognition change detection algorithms Computer science Engineering management Decision making Automatic speech recognition Testing Spatial databases

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Robust detection of structural changes in nonlinear stochastic systems

Robust detection of structural changes in nonlinear stochast...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： W. Kolodziej A. Pacut Department of Electrical and Computer Engineering Oregon State University Corvallis OR USA

The synthesis of a sequential structural-change-detection algorithm is presented with the emphasis on minimizing the priori information required. Such an algorithm is expected to be fairly robust with respect to a variety of probabilistic change models. The design is based on the class of conditionally linear signal generators that readily accommodate various feedback-control and parameter-estimation schemes. The proposed algorithm is optimal with respect to a wide class of sequential detection algorithms.< >

关键词： Robustness Stochastic systems change detection algorithms detection algorithms Stochastic processes Nonlinear filters Differential equations Algorithm design and analysis Signal synthesis Signal design

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Dynamic Multi-Objective Optimization Based on an Improved Lion Group Algorithm

Dynamic Multi-Objective Optimization Based on an Improved Li...

引用

International Conference on Artificial Intelligence and Big Data (ICAIBD)

作者： Yumeng Wang Xinchang Yu Jingjing Wang Huaqiang Xu Shandong Normal University China

ISBN: (数字)9798350385106

ISBN: (纸本)9798350385113

In this paper, the conventional lion group algorithm is improved and used to solve Dynamic Multi-objective Optimization Problems (DMOPs). An environment change detection strategy is adopted to determine whether the environment changes by calculating the average difference in fitness values of the hunting lions. Furthermore, the algorithm constructs a time series by recording the positions of the lion king at times $t$ - 1 and $t$ to predict the lion king's position at time t + 1 to adapt to the changing environment. The performance of the proposed algorithm is studied by comparing it with four state-of-the-art dynamic optimization algorithms. The experimental results show that the proposed algorithm outperforms other peer algorithms in most benchmark functions.

关键词： change detection algorithms Heuristic algorithms Time series analysis Big Data Benchmark testing Prediction algorithms Recording

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Detecting Stealthy Spreaders Using Online Outdegree Histograms

Detecting Stealthy Spreaders Using Online Outdegree Histogra...

引用

International Workshop on Quality of Service

作者： Yan Gao Yao Zhao Robert Schweller Shobha Venkataraman Yan Chen Dawn Song Ming-Yang Kao Northwestern University Evanston IL USA Northwestern University Evanston IL 60208 USA Carnegie Mellon University Pittsburgh PA 15213 USA Carnegie Mellon University Pittsburgh PA USA

We consider the problem of detecting the presence of a sufficiently large number of hosts that connect to more than a certain number of unique destinations within a given time window, over high-speed networks. We call such hosts stealthy spreaders. In practice, stealthy spreaders can be symptomatic of botnet scans or moderate worm propagation. Previous techniques have focused on detecting sources with an extremely large outdegree. However, such techniques fail to detect spreaders such as bot scans in which each scanning host scans only a moderate, fixed number of destinations. In contrast, our scheme maintains a small, fixed size memory usage, and is still able to detect stealthy spreader scenarios by approximating outdegree histograms from continuous traffic. To the best of our knowledge, we are the first to study the efficient outdegree histogram estimation and stealthy spreader detection problems. Evaluation based on real Internet traffic and botnet scan events show that our scheme is highly accurate and can operate online.

关键词： Histograms Telecommunication traffic High-speed networks Monitoring change detection algorithms Entropy Phase detection IP networks Web and internet services Random access memory

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Computerized detection of cemento-enamel junctions in digitized dental radiographs

Computerized detection of cemento-enamel junctions in digiti...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： R.M. Haralick V. Ramesh E. Hausmann K. Allen Departmentof.EE University of Washington Seattle WA USA Department ofOral Biology Suny at Buffalo Buffalo NY USA

The authors present a mathematical morphology algorithm for the detection of the cemento-enamel junction (CEJ) on dental radiographs to determine anatomical crest level. An experiment was carried out using dental images obtained by digitizing radiographs in an image analysis system. The results demonstrated that by employing a simple sequence of operations involving morphological openings and closings and other basic Boolean operations, the desired CEJ can be extracted accurately.< >

关键词： Dentistry Morphology Diagnostic radiography Diseases Bones Pixel Teeth Biology computing change detection algorithms History

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A motion-tolerant dissolve detection algorithm

A motion-tolerant dissolve detection algorithm

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： C.W. Su H.R. Tyan H.Y.M. Liao L.H. Chen Department of Computer Science and Information Engineering National Central University Taiwan Department of Information and Computer Engineering Chung Yuan Christian University Taiwan Institute of Applied Science and Engineering Research Academia Sinica Taiwan Department of Computer Science and Information Engineering Fu Jen University Taiwan

Gradual shot change detection is one of the most important research issues in the field of video indexing/retrieval. Among the numerous types of gradual transitions, dissolve is considered the most common one, but also the most difficult to be detected one. It's well known that an efficient dissolve detection algorithm which can be executed on a real video is still deficient. In this paper, we present a novel dissolve detection algorithm that can efficiently detect dissolves with different durations. In addition, global motions caused by camera movement and local motions caused by object movement can be discriminated from a real dissolve by our algorithm. The experimental results show that the new method is indeed powerful.

关键词： detection algorithms Gunshot detection systems change detection algorithms Computer science Cameras Multimedia databases Image edge detection Layout Physics Motion detection

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Curve segmentation by continuous smoothing at multiple scales

Curve segmentation by continuous smoothing at multiple scale...

引用

IEEE International Conference on Image Processing

作者： C. Orrite J.E. Lopez A. Alcolea Department of Electrical Electronics and Communications Engineering University of Zaragoza Zaragoza Spain

In the case of curve description, the accurate and precise estimation of corners plays an important role. Corners exhibit a high change of curvature /spl kappa/', so we propose the location of them by means of the estimation of /spl kappa/' at different scales of smoothing. The main problem arises when the curvature is computed because of the inherent quantization. We propose to calculate the curvature of contours detected at subpixel level so that, the quantization error is reduced. Once the change of curvature has been estimated, the curve is segmented at high /spl kappa/' points. It is important to emphasise the fact that the curves are segmented before a smoothing at coarser scale is applied, otherwise two close corners could be merged as smoothing increases.

关键词： Smoothing methods Quantization Application software change detection algorithms Partitioning algorithms Computer vision Computer errors Error correction Kernel Detectors

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A hybrid method for Doppler spread estimation [mobile radio systems]

A hybrid method for Doppler spread estimation [mobile radio ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： O. Mauritz Huawei Technologies Company Limited Kista Sweden

The Doppler spread estimator presented in this paper solves some problems encountered in some of the previously published solutions. The algorithm consists of two steps, both using the channel autocorrelation function. The first step is a coarse estimate, based on the sign change of the autocorrelation function. Depending on the coarse estimate, either a polynomial fit method (for low Doppler spreads) or a first zero detection method (for high Doppler spreads) is applied. The proposed hybrid Doppler spread estimator provides high estimation accuracy for a wide range of Doppler spreads.

关键词： Autocorrelation Receivers Frequency Radio transmitters Fading Filters change detection algorithms Polynomials Mobile communication Feedback

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