检索结果-内蒙古大学图书馆

AGC design in frequency modulation system for voice communication via underwater acoustic channel

Sensors and Transducers 2013年第5期152卷 116-121页

作者： Cheng, En Chen, Sheng-Li Li, Ye Ke, Fu-Yuan Yuan, Fei Key Lab of Underwater Acoustic Communication and Marine Information Tech of the Ministry of Edu Xiamen University Xiamen 361005 China Key Laboratory of Computer Network of Shandong Province Shandong Computer Science Center Jinan 250014 China

The FM modulation improves the anti-interference ability by sacrificing the bandwidth of the communication channel. In the underwater acoustic communication, as the bandwidth of the communication channel is very limited, the theory and experiment study show that if we are not deal with the original signal, the modulated signal cannot be transmitted through the underwater channel. In the research of underwater FM system, we find a better way to filtering and AGC. Adding filtering and AGC can not only control the bandwidth of the modulated signal but also improve the anti-noise ability integrally. © 2013 by IFSA.

关键词： Underwater acoustic communication

来源：评论

学校读者我要写书评

暂无评论

Joint source-channel coding for underwater image transmission

引用

Sensors and Transducers 2013年第5期152卷 122-128页

作者： Chen, Hua-Bin Chen, Wei-Ling Li, Ye Cheng, En Yuan, Fei Key Lab of Underwater Acoustic Communication and Marine Information Tech of the Ministry of Edu Xiamen University Xiamen 361005 China Key Laboratory of Computer Network of Shandong Province Shandong Computer Science Center Jinan 250014 China

Underwater acoustic (UWA) channel is a complex time-, space- and frequency-variant channel. So to realize the high efficiency and real-time transmission of image with great data quantity, it will refer to both source coding and channel coding. In underwater acoustic channel, the Joint Source and Channel Coding (JSCC) get better performance than separated coding. To aim at the image transmission in UWA communication system, this paper presents joint source and channel coding approach, putting forth the technology of joint source and channel coding in image transmission in the underwater acoustic channel. And it is an active attempt that the joint source and channel coding combines with OFDM technology to insure image transmission with high quality in underwater acoustic channel. Studies also show that the method can get better balance between bit error rate and code length, and the image can get better anti-noise property. © 2013 by IFSA.

关键词： Underwater acoustics

来源：评论

学校读者我要写书评

暂无评论

Quantitative Measurement of Coronary Artery Stenosis in CCTA Images Using a 2D Parametric Intensity Model

Quantitative Measurement of Coronary Artery Stenosis in CCTA...

引用

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

作者： Guanyu YANG Xinglou ZHAO Lijun TANG Huzhong SHU Christine TOUMOULIN Lab of Image Science and Technology Key Laboratory of Computer Network and Information Integration (Southeast University) Dept. of Radiology the First Affiliated Hospital of Nanjing Medical University INSERM-U1099 LTSI Universite de Rennes 1

ISBN: (纸本)9781424479276

In this paper, we propose an approach based on 2D vessel model to segment the vessel lumen in three-dimensional coronary computed tomographic angiography (CCTA) images. The 2D parametric intensity model is introduced first to simulate the intensity distribution of vessel lumen with different size in the longitudinal images. Then the Levenberg-Marquardt method is applied to fit the model within a series of region-of interests defined in the longitudinal image. The estimated parameters of the model are employed to define the boundary points of vessel lumen. The detected boundary points of vessel lumen in six longitudinal images are transformed to the cross-sectional planes in order to calculate the degree of stenosis according to the luminal areas. Our proposed method was evaluated in ten CCTA images with ten reported non-calcified stenosis. The degree of each stenosis was computed according to the luminal area and compared with the standard reference given by radiologists. Experimental results show that our method can estimate the degree of stenosis with a high accuracy.

关键词： Image segmentation Arteries Fitting Solid modeling Three-dimensional displays Computational modeling Accuracy

来源：评论

学校读者我要写书评

暂无评论

Voice conversion towards modeling dynamic characteristics using switching state space model

引用

Science China(information Sciences) 2013年第12期56卷 237-251页

作者： XU Ning BAO JingYi LIU XiaoFeng JIANG AiMing TANG YiBing College of Computer and Information Engineering Hohai University Ministry of Education Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications School of Electronic Information and Electric Engineering of Changzhou Institute of Technology

In the literature of voice conversion(VC),the method based on statistical Gaussian mixture model(GMM)serves as a ***,one of the inherent drawbacks of GMM is well-known as discontinuity problem,which is caused by transforming features on a frame-by-frame basis,thus ignoring the dynamics between adjacent frames and fnally resulting in degraded quality of the converted speech.A variety of algorithms have been proposed to overcome this defciency,among which the state space model(SSM)based method provides some promising *** this paper,we proceed by presenting an enhanced version of the traditional SSM,namely,the switching SSM(SSSM).This new structure is more flexible than the conventional one in that it allows using mixture of components to account for the rapid transitions between neighboring ***,physical meaning of the model parameters of SSSM has been examined in depth,leading to efcient application-specifc training and transforming procedures of *** including both objective and subjective measurements were conducted to compare the performances of the conventional and the proposed SSM-based methods,which have convinced that obvious improvements in both aspects of similarity and quality can be obtained by SSSM.

关键词： discontinuity problem dynamic characteristics Gaussian mixture model switching state space model voice conversion

来源：评论

学校读者我要写书评

暂无评论

Cloud Computing in Electric Vehicles Charging Control and Dispatch Optimization

Cloud Computing in Electric Vehicles Charging Control and Di...

引用

2014 IEEE International Conference on Progress in Informatics and Computing

作者： Dan Wu Bo Liu Zhijian Chen Wenyan Xie Xiang Huang Shuwei Pei Bin Sheng Donghan Feng Information Center China Southern Power Grid Co. Ltd. Dept. of Computer Science and Engineering Shanghai JiaoTong University Network & Information Branch Guangdong Electric Power Design Institute The State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Dept. of Electrical Engineering Shanghai JiaoTong University

Charging of large-scale electric vehicles will have a significantimpact on the grid sothat their charging schedule needs tobe optimized. The traditional centralized scheduling method requires high performance in information exchange and computing. Based on the analysis of the features of electric vehicle charging load and the research of cloud computing, we propose a cloud computing based schedule platform for optimal charging of electric vehicles. In addition, the function and implementation of the three basic modules of the platform(the data collection module, the cloud computing center and the control center) are exposed. The platform performs well in optimal scheduling for electric vehicles. In addition, the platform can alsomake full use of the computing resource and reduce the communication congestion.

关键词： cloud computing electric vehicle optimal charging service platform

来源：评论

学校读者我要写书评

暂无评论

Mobile Anchor Assisted Localization in Wireless Sensor networks with Regular Polygon Path

Mobile Anchor Assisted Localization in Wireless Sensor Netwo...

引用

2013 IEEE 4th International Conference on Software Engineering and Service Science

作者： Huanqing Cui Chuan'ai Zhou Xiaojing Meng Rong Hua Shandong Provincial Key Laboratory of Computer Network Shandong Computer Science Center College of Information Science and Engineering Shandong University of Science and Technology

ISBN: (纸本)9781467349994

Mobile anchor assisted localization methods for wireless sensor networks can decrease the cost while improving the accuracy,and the moving trajectory is an interesting and basic issue in this kind of *** paper proposes the regular polygon path derived from Circle,which is the best determined *** upper-bound of the polygon and the localization scheme are presented,and the performance is evaluated by simulations.

关键词： wireless sensor network localization mobile anchor regular polygon path

来源：评论

学校读者我要写书评

暂无评论

Provably-secure certificateless proxy re-signature scheme

Provably-secure certificateless proxy re-signature scheme

引用

5th IEEE International Conference on Intelligent networking and Collaborative Systems, INCoS 2013

作者： Xiao, Haiyan Zhang, Minqing Key Laboratory of computer Network and Information Security of Engineering Institute of the Armed Police Xi'an Shanxi China

ISBN: (纸本)9780769549880

The paper proposes a provably-secure certificateless proxy re-signature scheme. Based certificateless public cryptosystem, it solves the using of certificate in certificate-based scheme and removes key escrow in ID-based scheme. Analysis shows that the proposed scheme can satisfy the required properties of a proxy re-signature, and it avoids public key replacement attack and malicious KGC attack. The scheme provides stronger security. © 2013 IEEE.

关键词： Public key cryptography

来源：评论

学校读者我要写书评

暂无评论

Secure multi-party confidential protocol of matrix factorization

Secure multi-party confidential protocol of matrix factoriza...

引用

5th IEEE International Conference on Intelligent networking and Collaborative Systems, INCoS 2013

作者： Xiao, Haiyan Yang, Xiaoyuan Key Laboratory of computer Network Information Security of Engineering Institute of the Armed Police Xi'an Shanxi China

ISBN: (纸本)9780769549880

The confidential computation of matrix is a very important issue in secure multi-party computation. But there is no literature proposed truly multi-party confidential computation protocol on matrix factorization. In this paper, we use data perturbation assumptions and oblivious transfer protocol to construct a multi-party confidential computation protocol on matrix factorization which has high efficiency. © 2013 IEEE.

关键词： Factorization

来源：评论

学校读者我要写书评

暂无评论

Coverage Enhancement Strategy Based on Novel Perception and Co-evolution for Multimedia Sensor networks

引用

电子学报(英文版) 2013年第1期22卷 135-140页

作者： XIAO Fu WANG Jing SUN Lijuan WANG Ruchuan GUO Jian College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou 215006 China

Coverage enhancement is one of the hot research topics in wireless multimedia sensor networks. A novel Coverage-enhancing algorithm based on three-dimensional Directional perception and co-evolution (DPCCA) is proposed in multimedia sensor networks on the basis of the model whose pitch angle and deviation angle can be adjusted. Based on the proposed elliptical cone sensing model, we can derive the coverage area of the node and calculate the optimal pitch angle according the information of monitoring area and the nodes, and then the deviation angle is optimized based on co-evolution algorithm, which eliminate the overlapped and blind sensing area effectively. A set of simulations demonstrate the effectiveness of our algorithm in coverage ratio.

关键词：无线多媒体传感器网络网络覆盖协同进化感知增强算法网络工程测量模型

来源：评论

学校读者我要写书评

暂无评论

A robust approach for palm ROI extraction based on real-time region learning

引用

2012 International Conference on Service-Oriented Computing, ICSOC 2012

作者： Yan, Meng Sun, Dongmei Zhao, Shouguo Zhou, Jiajia Key Laboratory of Advanced Information Science and Network Technology of Beijing School of Computer and Information Technology Beijing Jiaotong University China

ISBN: (纸本)9783319029603

A palmprint based authentication system that can work with a popular webcam in non-contact acquisition mode is potentially a good choice for biometric ***,this camera based imaging acquisition mode causes the difficulty for the location of palmprint due to the unstable palm position and variable illumination condition and effects the extraction of palm region of interest(ROI).In particular,changes in illumination of the system effect its performance heavily. The process of extract palm ROI has been discussed in different papers, but hardly does very well under variable light conditions and pose *** this paper,we propose a robust approach for localizing the palm and extracting the ROI based on real-time region learning.A dynamical region is learned to binarize the image and get the hand contour to extract the palm ROI. In a database of 1000 video clips of hand under different illumination and poses,the accurate extraction rate reaches 92%. © Springer International Publishing 2013.

关键词： Extraction

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：