检索结果-内蒙古大学图书馆

基于等厚干涉的轴向空间相干度分析及其在表面形状测量中的可行性探讨(英文)

实验力学 2002年第4期17卷 403-411页

作者：段志辉,Golkher Mark,Joseph Rosen,小琦宽和,石进信生,武田光夫,张青川中国科学技术大学力学和机械工程系 Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Laboratory for Information Photonics and Wave Signal Processing Department of Information and Communication Engineering The University of Electro-Communications Laboratory for Information Photonics and Wave Signal Processing Department of Information and Communication Engineering The University of Electro-Communications Laboratory for Information Photonics and Wave Signal Processing Department of Information and Communication Engineering The University of Electro-Communications 中国科学技术大学力学和机械工程系合肥230027 Israel Negev P. O. Box 653 Beer-Sheva 84105 Israel Israel Negev P. O. Box 653 Beer-Sheva 84105 Israel 1-5-1 Chofugaoka Chofu Tokyo 182-8585 Japan 1-5-1 Chofugaoka Chofu Tokyo 182-8585 Japan 1-5-1 Chofugaoka Chofu Tokyo 182-8585 Japan 合肥230027

从等厚干涉的解释出发,推导出了二维空间的相干方程.基于空间相干方程,利用SLM产生了一个新的空间非相干光源.同时提出了新的相移方案,并结合这个新的相移方案,实现了轴向空间距离的探测和干涉条纹的相移.分析了空间方向角对相干方程的... 详细信息

从等厚干涉的解释出发,推导出了二维空间的相干方程.基于空间相干方程,利用SLM产生了一个新的空间非相干光源.同时提出了新的相移方案,并结合这个新的相移方案,实现了轴向空间距离的探测和干涉条纹的相移.分析了空间方向角对相干方程的影响,并给出了实验验证.通过对非相干光源的参数和特定的空间距离以及空间方向角的匹配,重建了一个具有标准段差的实际物体的表面形状.为光学表面形状测量提供了新的思路.

关键词：表面形状测量轴向空间相干度等厚干涉空间非相干光源空间光调制器空间方向角相移

来源：评论

学校读者我要写书评

暂无评论

Elevation interferometric STAP using a thinned planar array

Elevation interferometric STAP using a thinned planar array

引用

IEEE National Conference on Radar

作者： T.B. Hale M.A. Temple J.F. Raquet M.E. Oxley M.C. Wicks Dept of Electrical and Computer Engineering (AFIT/ENG) Air Force Institute of Technology OH Dept of Mathematics and Statistics (AFIT/ENC) Air Force Institute of Technology OH Department of Mathematics and Statistics (AFIT/ENC) Air Force Institute of Technology OH USA Sensors Directorate Radar Signal Processing Branch (AFRL/SNRT) Air Force Research Laboratory Rome NY

ISBN: (纸本)078037357X

The research applies space-time adaptive processing (STAP) techniques to a pseudo-circular array generated by selectively thinning a rectangular array. A hybrid approach incorporating elevation interferometry and STAP techniques is used. Results show the thinned 16-element pseudo-circular array offers significant detection performance improvement over the baseline factored time-space (FTS) technique operating on a linear array, e.g., an 8-element horizontal linear array. Results are demonstrated for cases with and without range ambiguous clutter. This performance level is achieved using a factor of M less sample support than required for full adaptivity where M represents the number of pulses within a coherent processing interval.

关键词： Planar arrays Sensor arrays Clutter Force sensors Adaptive arrays Degradation Filtering Military computing Mathematics Statistics

来源：评论

学校读者我要写书评

暂无评论

Management of end-to-end security in collaborative IP network environments 7

Management of end-to-end security in collaborative IP networ...

引用

7th IEEE/IFIP International Symposium on Integrated Network Management, IM 2001

作者： Sivasubramanian, B. Sundareshan, M.K. Information Processing and Decision Systems Laboratory Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721-0104 United States

ISBN: (纸本)0780367197

Growth in popularity of the Internet has spawned a great interest in collaborative IP networks that support collaborative meetings between individuals or groups located at remote stations. The emphasis on security of information transfer during these meetings has made the management of end-to-end security in collaborative IP network environments, that may involve the creation of ad hoc communication networks that contain the Internet as an intermediate network, an important research issue. Addition of security features through standard methods gives rise to complex incompatibility problems resulting from the specific routing and address translation schemes that may be in place in these networks. The development of enhanced protocols that remove this incompatibility and ensure interoperability between security functions and address translation functions is discussed in this paper. Detailed steps in ensuring end-to-end security in various cases involving change of IP address, change of both IP address and the port, and the use of encapsulation security payload implemented in transport mode are described. The enhanced protocols presented here support generic implementation in the sense that the implementation of the security-related protocol is transparent to the use or not of the address translation scheme. For providing a proof of concept demonstration of the proposed solutions, the structure of a prototype collaborative network, which employs the Internet as an intermediate communication medium for supporting videoconferencing between remote stations, is outlined. © 2001 IEEE.

关键词： Environmental management

来源：评论

学校读者我要写书评

暂无评论

Considering the alternatives in low-power design

引用

IEEE Circuits and Devices Magazine 2001年第4期17卷 23-29页

作者： Stouraitis, T. Paliouras, V. Department of Electrical and Computer Engineering University of Patras Greece IEEE Circuits and Systems Society Technical Committee on VLSI Systems and Applications Digital Signal Processing and the Multimedia Systems Committees United States VLSI Design Laboratory ECE Dept. University of Patras Greece Computer Engineering and Informatics Department University of Patras Greece ACM SIAM Technical Chamber of Greece Greece

Recent advances in computer arithmetic offer interesting alternative solutions for low-power design. Depending on an assortment of factors that need to be considered, it is worth evaluating the logarithmic number system (LNS) or the residue number system (RNS) for hardware implementations of computationally intensive tasks. As such, the choice of arithmetic can lead to substantial power savings.

关键词： Integrated circuit layout

来源：评论

学校读者我要写书评

暂无评论

Robust layered coding of video for transmission over noisy channels

Robust layered coding of video for transmission over noisy c...

引用

2001 IEEE International Symposium on Circuits and Systems, ISCAS 2001

作者： Boulgouris, Nikolaos V Leontaris, Athaizasios Thomos, Nikolaos Strintzis, Michael G. Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki 54006 Greece Informatics and Telematics Institute 1 Kyvernidou str. Thessaloniki 546 39 Greece

ISBN: (纸本)0780366859

A novel robust scheme is presented, for the efficient transmission of image sequences over unreliable channels. The proposed scheme is based on an efficient error-resilient wavelet video coder and is able to produce embedded bitstreams. The robust coder is evaluated for the transmission of image sequences over binary symmetric channels and is shown to have very promising performance. © 2001 IEEE.

关键词： Video signal processing

来源：评论

学校读者我要写书评

暂无评论

Acceleration of a 2D-FFT on an Adaptable Computing Cluster

Acceleration of a 2D-FFT on an Adaptable Computing Cluster

引用

Annual IEEE Symposium on Field-Programmable Custom Computing Machines (FCCM)

作者： K.D. Underwood R.R. Sass W.B. Ligon Parallel Architecture Research Laboratory Holcombe Department of Electrical and Computer Engineering Clemson University Clemson SC USA

Despite a decade of research into their use for computing applications, FPGA-based custom computing machines are still only used to accelerate a limited range of applications. Recognizing that recent advances in network technology provide an opportunity for a more general-purpose application of custom computing machines, we develop the idea of an intelligent network adapter for cluster-based parallel computing, calling the resulting architecture an Adaptable Computing Cluster. Results presented suggest that placing the FPGAs in the data path to the network dramatically improves the performance and scalability of target applications. This is especially noteworthy because the target applications have historically not performed well on either technology. This paper discusses how FPGAs can be used to provide network functionality while increasing compute power. The focus is on a specific application, the 2D Fast Fourier Transform, with additional insights into the implications for parallel computing on a cluster.

关键词： Acceleration computer applications computer networks Concurrent computing parallel processing Field programmable gate arrays Intelligent networks computer architecture Scalability Fast Fourier transforms

来源：评论

学校读者我要写书评

暂无评论

A rate-distortion optimal video pre-processing algorithm

A rate-distortion optimal video pre-processing algorithm

引用

IEEE International Conference on Image processing

作者： P.V. Karunaratne C.A. Segall A.K. Katsaggelos Image and Video Processing Laboratory Department of Electrical and Computer Engineering Northwestern University Evanston IL USA

Pre-processing algorithms improve the quality of a compression system by removing unimportant data before encoding. This enhances both the visual quality and coding efficiency of the system. We cast the pre-processing problem in the operational rate-distortion framework. Filtering the displaced frame difference is the focus, and the proposed method couples the choice of the quantization scale to the response of the prefilter. Coding errors are then addressed by penalizing significant differences between coded blocks. Finally, experimental results illustrate the efficacy of the method within the context of an MPEG-2 coding scenario.

关键词： Rate-distortion Low pass filters Image coding Decoding Transform coding Video compression Focusing Image quality Filtering algorithms Image sequences

来源：评论

学校读者我要写书评

暂无评论

Exploiting Locality in Single Assignment Data Structures Updated Through Split-Phase Transactions

引用

Cluster Computing 2001年第4期4卷 281-293页

作者： Amaral, José Nelson Lin, Wen-Yen Gaudiot, Jean-Luc Gao, Guang R. Department of Computing Science University of Alberta Edmonton Canada Tia Mobile Inc. Pasadena USA Department of Electrical Engineering University of Southern California Los Angeles USA Computer Architecture and Parallel Systems Laboratory Department of Electrical and Computer Engineering University of Delaware Newark USA

We present the design, implementation, and evaluation of single assignment data structures and of a software controlled cache in an existing multi-threaded architecture platform – the Efficient Architecture for Running Threads (EARTH). The I-Structure Software-Controlled Cache (ISSC) exploits temporal and spatial locality of EARTH split-phased memory transactions for single-assignment memory references. Our experimental evaluation indicates that the caching mechanism for single-assignment storage makes the EARTH memory system more robust to variations in the latency of memory operations. As a consequence the system can be ported to a wider range of machine platforms and deliver speedup for both regular and irregular application.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Robust algorithm for watermark recovery from cropped speech

Robust algorithm for watermark recovery from cropped speech

引用

International Conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： A. Gurijala J.R. Deller Speech Processing Laboratory Department of Electrical & Computer Engineering Michigan State University East Lansing MI USA

Most digital watermarking techniques are susceptible to damage by data cropping. Although the effects of cropping might not be perceptible, watermark recovery may be rendered difficult or impossible due to the desynchronization of the recovery process. The transform encryption coding (TEC) based watermarking algorithm was presented at ICASSP 2000 (see Ruiz, F.J. and Deller, J.R., Jr, IEEE International Conference on Acoustics, Speech and Signal processing 2000). This paper investigates the performance of TEC watermarking in the presence of cropping, and presents an algorithm that identifies cropped samples and recovers watermarks from the damaged record. Implementation details and experimental results under different environmental conditions are presented.

关键词： Robustness Watermarking Cryptography Speech processing Security Filters Costs Energy measurement Gain measurement Signal processing

来源：评论

学校读者我要写书评

暂无评论

Management of end-to-end security in collaborative IP network environments

Management of end-to-end security in collaborative IP networ...

引用

IFIP/IEEE International Symposium on Integrated Network Management

作者： B. Sivasubramanian M.K. Sundareshan Information Processing & Decision Systems Laboratory Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

ISBN: (纸本)0780367197

关键词： Collaboration IP networks Information security Protocols Environmental management Communication networks Encapsulation Payloads Prototypes Collaborative work

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：