检索结果-内蒙古大学图书馆

International Conference on Telecommunications and signal processing

作者： Sina Salsabili Sepideh Hajipour Sardoui Mohammad B. Shamsollahi School of Engineering and Science Sharif University of Technology - International Campus Kish Island Biomedical Signal and Image Processing Laboratory (BiSIPL) School of Electrical Engineering Sharif University of Technology

ISBN: (纸本)9781479984992

Noise contamination is inevitable in biomedical recordings. In some cases biomedical recordings are highly contaminated with artifacts which make the effective recovering process hard to achieve. Many different methods have been proposed for artifact removal from biomedical signals but introducing an effective method which can present valuable data for medical analysis, is still an ongoing process. In this paper a new method for interictal EEG denoising is presented. Single-channel ICA denoising method based on EMD decomposition is used to improve the multi-channel ICA denoising results. This method is tested on simulated epileptic recordings which are contaminated with real muscle artifact and EEG background activity.

关键词： Single Channel ICA Multi-channel ICA denoising EMD Interictal Epileptic Spikes Muscle artifact EEG background activity

来源：评论

学校读者我要写书评

暂无评论

Motion compensation for high-resolution automobile-SAR

Motion compensation for high-resolution automobile-SAR

引用

IEEE China Summit & International Conference on signal and Information processing (ChinaSIP)

作者： Ahmed Azouz Zhenfang Li School of Electronic Engineering Xidian University Xi'an China National Key Laboratory of Science and Technology on Radar Signal Processing Xidian University Xi'an China

This paper concerns the compensation of track deviations in high-resolution automobile synthetic aperture radar (SAR). We establish the geometry in which the automobile SAR raw data is acquired. Based on the derived model, the research investigates the impact of track deviations on the final focused image quality and we propose motion compensation (MOCO) strategy which can be applied to obtain a well-focused SAR image. This paper presents how to obtain the accurate positions of the antenna phase center (APC) using the velocity and attitude angles measured by inertial navigation system (INS)/global positioning system (GPS), and proposes a new method to compensate the forward velocity errors which are decomposed into two components and compensated individually, that is, high-order and low order phase compensation. Finally, the results from real data are presented to validate the whole analysis and the proposed procedure.

关键词： Synthetic aperture radar Azimuth Tracking Motion compensation radar tracking Chirp Navigation

来源：评论

学校读者我要写书评

暂无评论

Hybridizing infeasibility driven and constrained-domination principle with MOEA/D for constrained multiobjective evolutionary optimization

Lecture Notes in Computer Science (including subseries Lectu...

引用

Lecture Notes in Computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8916卷 249-261页

作者： Lin, Huibiao Fan, Zhun Cai, Xinye Li, Wenji Wang, Sheng Li, Jian Zhang, Chengdian School of Engineering Shantou University Guangdong515063 China College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics NanjingJiangsu210016 China College of Science Shantou University Guangdong515063 China Guangdong Provincial Key Laboratory of Digital Signal and Image Processing Techniques Shantou University Guangdong515063 China

This paper presents a novel multiobjective constraint handling approach, named as MOEA/D-CDP-ID, to tackle constrained optimization problems. In the proposed method, two mechanisms, namely infeasibility driven (ID) and constrained-domination principle (CDP) are embedded into a prominent multiobjective evolutionary algorithm called MOEA/D. Constraineddomination principle defined a domination relation of two solutions in constraint handling problem. Infeasibility driven preserves a proportion of marginally infeasible solutions to join the searching process to evolve offspring. Such a strategy allows the algorithm to approach the constraint boundary from both the feasible and infeasible side of the search space, thus resulting in gaining a Pareto solution set with better distribution and convergence. The efficiency and effectiveness of the proposed approach are tested on several well-known benchmark test functions. In addition, the proposed MOEA/D-CDP-ID is applied to a real world application, namely design optimization of the two-stage planetary gear transmission system. Experimental results suggest that MOEA/D-CDP-ID can outperform other state-of-the-art algorithms for constrained multiobjective evolutionary optimization. © Springer International Publishing Switzerland 2014.

关键词： Constraint handling

来源：评论

学校读者我要写书评

暂无评论

A Modified Joint Maximum Likelihood Sequence Estimation Algorithm for Burst signal

A Modified Joint Maximum Likelihood Sequence Estimation Algo...

引用

Wireless Communication and Sensor Network, Intl Conference on

作者： Kun Zhang You-Rong Lu Wei Wang Yan Qi National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

ISBN: (纸本)9781479970926

The joint maximum likelihood sequence estimation (JMLSE) is a useful algorithm for the single-antenna co-channel interference cancellation. But the conventional JMLSE algorithm is only suitable for continuous signal. If burst signals are processed as continuous signals, the conventional JMLSE will suffer an error floor. To overcome this problem, a modified JMLSE algorithm was proposed for burst digital signal. Simulation results show that the proposed algorithm can eliminate the defect of error floor, and the performance is almost the same as continuous signal processing.

关键词： GSM Joints signal processing algorithms Floors Maximum likelihood estimation Interchannel interference

来源：评论

学校读者我要写书评

暂无评论

Improved phase gradient autofocus algorithm based on segments of variable lengths and minimum entropy phase correction

Improved phase gradient autofocus algorithm based on segment...

引用

IEEE China Summit & International Conference on signal and Information processing (ChinaSIP)

In this paper, an improved phase gradient autofocus (PGA) Algorithm motion compensation (MOCO) approaches is proposed for the unmanned aerial vehicle (UAV) synthetic aperture radar (SAR) imagery. The approach is implemented in two-steps. The first step determines the length of segments depending on number of good quality scatterers and motion errors obtained from navigation data. In the second step, a novel minimum-entropy phase correction based on the Discrete Cosine Transform (DCT) coefficients is proposed. In this approach, transform phase error estimates by PGA to DCT-coefficient. The entropy of a focused image is utilized as the optimization function of the DCT coefficients to improve the final images quality. Finally, real-data experiments show that the proposed approach is appropriate for highly precise imaging of UAV SAR.

关键词： Electronics packaging Entropy Image segmentation Motion segmentation Azimuth Synthetic aperture radar Navigation

来源：评论

学校读者我要写书评

暂无评论

ECG Denoising Using Mutual Information Based Classification of IMFs and Interval Thresholding

ECG Denoising Using Mutual Information Based Classification ...

引用

International Conference on Telecommunications and signal processing

作者： Marjaneh Taghavi Mohammad B. Shamsollahi Lotfi Senhadji School of Engineering and Science Sharif University of Technology International Campus Kish Island Biomedical Signal and Image Processing Laboratory (BiSIPL) School of Electrical Engineering Sharif University of Technology Laboratoire Traitement du Signal et de l'Image (LTSI) Universitede Rennes 1

ISBN: (纸本)9781479984992

The Electrocardiogram (ECG) is widely used for diagnosis of heart diseases. Therefore, the quality of information extracted from the ECG has a vital role. In real recordings, ECG is corrupted by artifacts such as prolonged repolarization, respiration, changes of electrode position, muscle contraction, and power line interface. In this paper, a denoising technique for ECG signals based on Empirical Mode Decomposition (EMD) is proposed. We use Ensemble Empirical Mode Decomposition (EEMD) to overcome the limitations of EMD. Moreover, to overcome the limitations of thresholding methods we use the combination of mutual information and two EMD based interval thresholding approaches. Our new method is evaluated on ECG signals available in MIT-BIH database. This method is compared with two EEMD based interval thresholding methods. The results show that our proposed method has a better signal to Noise Ratio improvement (SNRimp) and a lower Mean Square Error (MSE) than the other two methods.

关键词： Ensemble Empirical Mode Decomposition Denoising Mutual Information Instantaneous Half Period Interval Thresholding ECG

来源：评论

学校读者我要写书评

暂无评论

Waveform construction for distributed radar with high Doppler tolerance

Waveform construction for distributed radar with high Dopple...

引用

IEEE International Conference on radar

作者： Shenghua Zhou Hongwei Liu Huikai Zang Kuiying Yin National Laboratory of Radar Signal Processing Xidian University Xi'an China Nanjing Research Institute of Electronic Technology Nanjing China

ISBN: (纸本)9781479941940

Distributed radar sites needs a group of nearly-orthogonal waveforms and polyphase coded waveforms (PCWs) can approach the orthogonality in the code dimension. However, PCWs are sensitive to Doppler mismatch in range compression, which can induce signal-to-noise ratio (SNR) loss and sidelobe level increase. In this paper, we first study how to design a seed PCW with a high Doppler tolerance and then propose a waveform construction method that can simultaneously construct a group of nearly-orthogonal PCWs based only on the seed PCW. It is also proved that all the constructed PCWs share the same high Doppler tolerance with the seed PCW. The effectiveness of this method is verified by numerical results.

关键词： Doppler effect Doppler radar Frequency modulation signal to noise ratio Correlation Optimization

来源：评论

学校读者我要写书评

暂无评论

A database encryption scheme based on the generalized aryabhata remainder theorem

引用

Journal of Information Hiding and Multimedia signal processing 2014年第4期5卷 603-613页

作者： Liu, Yanjun Liu, Yanjun Chang, Chin-Chen Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University Hefei230039 China Department of Computer Science and Information Engineering Asia University Taichung413 Taiwan No.26 Hexing Road Xiangfang District Harbin China Department of Information Engineering and Computer Science Feng Chia University Taichung407 Taiwan

Database security prevents the disclosure of confidential data within a database to unauthorized users, and has become an urgent challenge for a tremendous number of database applications. Data encryption is a widely-used cryptographic technique for realizing database security in which the data kept in the database are encrypted into ciphertext. Inspired by Lin et al.’s database encryption system, we propose a record-oriented database encryption scheme based on the Generalized Aryabhata Remainder Theorem (GART). Analysis showed that our proposed scheme is more efficient than Lin et al.’s scheme, while retaining the same security. ©2014.

关键词： Database systems

来源：评论

学校读者我要写书评

暂无评论

On YASS’s Non-monotonic Security Performance

引用

Circuits, Systems, and signal processing 2014年第11期33卷 3527-3537页

作者： Yu, Lifang Zhao, Yao Ni, Rongrong Shi, Yun Qing Institute of Information Science Beijing Jiaotong University Beijing100044 China Beijing Key Laboratory of Signal and Information Processing for High-end Printing Equipments Beijing Institute of Graphic Communication Beijing102600 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Beijing Key Laboratory of Advanced Information Science and Network Technology Beijing100044 China Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102 United States

Recently, researchers have discovered unexpected bumps in the detection rate curve of yet another steganographic scheme (YASS). We refer to this abnormal phenomenon as non-monotonic security performance. This paper first analyzes this abnormality and points out that it is caused by the non-uniformity in probability of coincidence of (Formula presented.) embedding blocks and (Formula presented.) JPEG blocks. Based on this observation, we propose that further randomizing data embedding positions can overcome the non-monotonic security performance. Experimental results have demonstrated a complete removal of bumps in the detection rate curve of YASS after further randomization. © 2014, Springer science+Business Media New York.

关键词： Steganography

来源：评论

学校读者我要写书评

暂无评论

radar detection during tracking with constant track false alarm rate

Radar detection during tracking with constant track false al...

引用

IEEE International Conference on radar

作者： Hongliang Liu Shenghua Zhou Hongwei Liu Hongxian Wang National Laboratory of Radar Signal Processing Xidian University Xi'an China Beijing Institute of Special Electro-Mechanical Technology Beijing China

ISBN: (纸本)9781479941940

In traditional radar systems, target detection and target tracking are conducted separately, but if they are considered as a whole, higher target detection and tracking performance may be obtained. In this paper, we study how to perform target detection during target tracking. At the target tracking stage, we use the knowledge provided by the target tracking algorithm to facilitate target detection, and propose a criterion that a target track can terminate at a given probability when the target reflects no signal back suddenly. Simulation results indicate that this method can significantly improve the detection probability and expand the tracking distance at a low level of track false alarm rate.

关键词： Target tracking radar tracking Logic gates radar detection Object detection Covariance matrices

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：