检索结果-内蒙古大学图书馆

Package of the vector math library based on the sunway processor

Ruan Jian Xue Bao/Journal of Software 2014年 25卷 70-79页

作者： Xie, Qing-Chun Zhang, Yun-Quan Li, Yan Pang, Ren-Bo Wu, Zai-Long Lu, Yong-Quan Gao, Peng-Dong High Performance Computing Center Communication University of China Beijing100024 China Laboratory of Parallel Computing Institute of Software The Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Computer Architecture Institute of Computing Technology The Chinese Academy of Sciences Beijing100190 China Department of Computer and Network National Marine Environmental Forecasting Center Beijing100081 China School of Information Sceience and Technology The Ocean University of China Qingdao266100 China

This paper first introduces the SIMD (single instruction multiple data) extension technology and presents three ways to use SIMD instructions. It is considered that calling the third party library, which is optimized for the target platform by using those instructions, is the best way to benefit the developers. Next, it introduces the China-developed SW-1600 CPU, and a software package called SW-VML, which consists of many mathematical functions, by using the SIMD extension technology. In order to solve the additional overhead caused by unaligned address access and transformation between vector and scalar array, the paper provides some performance optimized methods, such as aligned address access, simplifying vector condition branch and loop unrolling. An upgrade to SW-VML is also offered to support multi-thread with OpenMP. Finally, functions in the package are tested using arrays of different sizes on SW-1600, and the test results show that high performance is achieved with the technology of the SIMD vectorization. Compared with the traditional methods of the scalar calculation, the average speedup is up to 2.06. The performance speedup of package using 4 threads is up to 2.26 compared to using a single thread. SW-VML is a common vector function package for domestic Sunway processor series, and it can be used as a basic toolkit which is beneficial to high performance computing on Sunway platform. ©2014 ISCAS.

关键词： Vectors

来源：评论

学校读者我要写书评

暂无评论

Action recognition of motion capture data

Action recognition of motion capture data

引用

Congress on Image and Signal Processing, CISP

作者： Na Lv Zhiquan Feng Lingqiang Ran Xiuyang Zhao Shandong Provincial Key Laboratory of Network based Intelligent Computing Jinan P.R. China Department of Information Science and Technology University of Jinan Jinan China School of Computer Science and Technology Shandong University Jinan China

ISBN: (纸本)9781479958368

With the advancement of motion capture technology, 3D skeleton data is easier to be obtained. 3D skeleton data has the advantage over traditional video data for the reason that it is less affected by illumination, complex background, self-occlusion and noise. 3D skeleton data brings new opportunities and challenges to the action recognition research. In this paper, we propose a new method for action recognition of motion capture data. We use relative velocity of all the joint pairs to encode the kinematic characteristics and the primary vector decomposed from Motion Sequence Volume(MSV) to represent the distribution of joint positions in the motion sequence. The extracted features are fed into a Spectral Regression Kernel Discriminant Analysis(SRKDA) classifier to identify motion types. In the experiment, our method obtains higher recognition accuracy than the state-of-art methods.

关键词： Feature extraction Joints Three-dimensional displays Conferences Pattern recognition computer vision

来源：评论

学校读者我要写书评

暂无评论

Public verifiable key encapsulation mechanism under factoring

Public verifiable key encapsulation mechanism under factorin...

引用

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

作者： Liu, Zhen Yang, Xiao Yuan Key Laboratory of computer Network and Information Security of Engineering Institute of the Armed Police Xi'an China

ISBN: (纸本)9780769549880

The cipher text consistency check that can be implemented publicly has practical significance, and it is always an interested studying aspect to construct cryptographic algorithm without pairings in the field of cryptographic. On the other hand, it is one of the most important research topics to design CCA-secure PKE schemes with weaker assumptions. Especially, there have been no CCA-secure PKE scheme under factoring assumption, except for a recent work by Hofheinz, D., Kiltz, E. A fly in the ointment is that HK09's scheme is not a public verifiable construction. Using the Gap quality that the Decisional Diffie-Hellman problem is easy but the Computational Diffie-Hellman problem is difficult as factoring, we instantiated HK09's scheme over the group of signed quadratic residues, and realized public verifiable construct. It will be used to construct threshold schemes. © 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

Complex field network-coded cooperation based on multi-user detection in wireless networks

引用

Journal of Systems Engineering and Electronics 2013年第2期24卷 215-221页

作者： Jing Wang Xiangyang Liu Kaikai Chi Xiangmo Zhao School of Information Engineering Chang'an University State Key Laboratory of Integrated Service Networks Xidian University Department of Network Management Xi'an Communication College College of Computer Science and Technology Zhejiang University of Technology

Cooperative communication can achieve spatial diversity gains,and consequently combats signal fading due to multipath propagation in wireless networks powerfully.A novel complex field network-coded cooperation（CFNCC） scheme based on multi-user detection for the multiple unicast transmission is *** analysis and simulation results demonstrate that,compared with the conventional cooperation（CC） scheme and network-coded cooperation（NCC） scheme,CFNCC would obtain higher network throughput and consumes less time ***,a further investigation is made for the symbol error probability（SEP） performance of CFNCC scheme,and SEPs of CFNCC scheme are compared with those of NCC scheme in various scenarios for different signal to noise ratio（SNR） values.

关键词： network coding complex field wireless network cooperative communication multi-user detection

来源：评论

学校读者我要写书评

暂无评论

Modeling and Global Conflict Analysis of Firewall Policy

引用

China Communications 2014年第5期11卷 124-135页

作者： LIANG Xiaoyan XIA Chunhe JIAO Jian HU Junshun LI Xiaojian Beij ing Key Laboratory of Network Technology Beihang University Beijing 100191 R R. China Beijing Information Science & Technology University Beijing 100192 P. R. China Software Development Center of China Agricultural Bank Beijing 100073 P. R. China College of Computer Science and Information Technology Guangxi Normal University Guilin 541004 Guangxi Province P. R. China

The global view of firewall policy conflict is important for administrators to optimize the *** has been lack of appropriate firewall policy global conflict analysis,existing methods focus on local conflict *** research the global conflict detection algorithm in this *** presented a semantic model that captures more complete classifications of the policy using knowledge concept in rough *** on this model,we presented the global conflict formal model,and represent it with OBDD(Ordered Binary Decision Diagram).Then we developed GFPCDA(Global Firewall Policy Conflict Detection Algorithm) algorithm to detect global *** experiment,we evaluated the usability of our semantic model by eliminating the false positives and false negatives caused by incomplete policy semantic model,of a classical *** compared this algorithm with GFPCDA *** results show that GFPCDA detects conflicts more precisely and independently,and has better performance.

关键词： firewall policy semantic model conflict analysis conflict detection

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

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

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：