检索结果-内蒙古大学图书馆

IEEE Transactions on Radar Systems 2024年 2卷 484-497页

作者： Biswas, Sabyasachi Manavi Alam, Ahmed Gurbuz, Ali C. Mississippi State University Department of Electrical and Computer Engineering Information Processing and Sensing Laboratory StarkvilleMS39672 United States

Micro-Doppler signatures (mu -DSs) are widely used for human activity recognition (HAR) using radar. However, traditional methods for generating mu -DS, such as the short-time Fourier transform (STFT), suffer from limitations, such as the tradeoff between time and frequency resolution, noise sensitivity, and parameter calibration. To address these limitations, we propose a novel deep learning (DL)-based approach to reconstruct high-resolution mu -DS directly from a 1-D complex time-domain signal. Our DL architecture consists of an autoencoder (AE) block to improve signal-to-noise ratio (SNR), an STFT block to learn frequency transformations to generate pseudo spectrograms, and, finally, a U-Net block to reconstruct high-resolution spectrogram images. We evaluated our proposed architecture on both synthetic and real-world data. For synthetic data, we generated 1-D complex time-domain signals with multiple time-varying frequencies and evaluated and compared the ability of our network to generate high-resolution mu -DS and perform in different SNR levels. For real-world data, a challenging radar-based American Sign Language (ASL) dataset consisting of 100 words was used to evaluate the classification performance achieved using the mu -DS generated by the proposed approach. The results showed that the proposed approach outperforms the classification accuracy of traditional STFT-based mu -DS by 3.48%. Both synthetic and experimental mu -DSs show that the proposed approach learns to reconstruct higher resolution and sparser spectrograms. © 2023 IEEE.

关键词： Signal to noise ratio

来源：评论

学校读者我要写书评

暂无评论

ANALYTICAL MODELING OF PLASMA IMMERSION ION-IMPLANTATION TARGET CURRENT USING THE SPICE CIRCUIT SIMULATOR

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B

引用

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B 1994年第2期12卷 833-837页

作者： EN, W CHEUNG, NW Plasma Assisted Materials Processing Laboratory Department of Electrical Engineering and Computer Sciences University of California Berkeley California 94720

Plasma immersion ion implantation applies a series of negative high-voltage pulses to a target immersed in a plasma. An analytical model of the currents and potentials induced before, during, and after the negative bias in a planar geometry is presented. The effect of multiple pulses on the results is also studied. The model determines the time-varying ion current, electron current, total current, total dose, and sheath thickness for a piecewise linear voltage pulse. The sheath collapse is found to be important for high repetition rate pulses. Implementation of the model is done in SPICE, a circuit simulator. Comparison with experimental data has demonstrated the accuracy of the model.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Implementing real-time partitioned convolution algorithms on conventional operating systems

Implementing real-time partitioned convolution algorithms on...

引用

14th International Conference on Digital Audio Effects, DAFx 2011

作者： Battenberg, Eric Avižienis, Rimas Parallel Computing Laboratory Department of Electrical Engineering and Computer Science University of California Berkeley CA United States

ISBN: (纸本)9782954035109

We describe techniques for implementing real-time partitioned convolution algorithms on conventional operating systems using two different scheduling paradigms: time-distributed (cooperative) and multi-threaded (preemptive). We discuss the optimizations applied to both implementations and present measurements of their performance for a range of impulse response lengths on a recent high-end desktop machine. We find that while the time-distributed implementation is better suited for use as a plugin within a host audio application, the preemptive version was easier to implement and significantly outperforms the time-distributed version despite the overhead of frequent context switches.

关键词： Impulse response

来源：评论

学校读者我要写书评

暂无评论

Social Energy:Mining Energy From the Society

引用

IEEE/CAA Journal of Automatica Sinica 2017年第3期4卷 466-482页

作者： Jun Jason Zhang David Wenzhong Gao Yingchen Zhang Xiao Wang Xiangyang Zhao Dongliang Duan Xiaoxiao Dai Jun Hao Fei-Yue Wang Department of Electrical and Computer Engineering Ritchie School of Engineering and Computer ScienceUniversity of Denver IEEE National Renewable Energy Laboratory Qingdao Academy of Intelligent Industries(QAII) QingdaoShandongChinaand SKL-MCCSCASIA School of Automation Science and Electrical Engineering Beihang University Department of Electrical and Computer Engineering College of Engineering and Applied ScienceUniversity of Wyoming State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of Sciences(SKL-MCCSCASIA) Research Center of Computational Experiments and Parallel Systems National University of Defense Technology

The inherent nature of energy,i.e.,physicality,sociality and informatization,implies the inevitable and intensive interaction between energy systems and social *** this perspective,we define "social energy" as a complex sociotechnical system of energy systems,social systems and the derived artificial virtual systems which characterize the intense intersystem and intra-system *** recent advancement in intelligent technology,including artificial intelligence and machine learning technologies,sensing and communication in Internet of Things technologies,and massive high performance computing and extreme-scale data analytics technologies,enables the possibility of substantial advancement in socio-technical system optimization,scheduling,control and *** this paper,we provide a discussion on the nature of energy,and then propose the concept and intention of social energy systems for electrical power.A general methodology of establishing and investigating social energy is proposed,which is based on the ACP approach,i.e., "artificial systems"(A), "computational experiments"(C) and "parallel execution"(P),and parallel system methodology.A case study on the University of Denver(DU) campus grid is provided and studied to demonstrate the social energy *** the concluding remarks,we discuss the technical pathway,in both social and nature sciences,to social energy,and our vision on its future.

关键词： ACP distribution locational marginal pricing intelligent operation in power systems parallel control parallel intelligence parallel management social energy socio-technical energy systems

来源：评论

学校读者我要写书评

暂无评论

Pillow talks: Bits over communications in WLAN 2

Pillow talks: Bits over communications in WLAN

引用

2nd Workshop for Mobile Sensing, Computing and Communication, MSCC 2015

作者： Dong, Xuan Zhu, Chunsheng Lv, Shaohe Wang, Lei Wang, Xiaodong Leung, Victor C.M. National Laboratory of Parallel and Distributed Processing National University of Defense Technology United States Department of Electrical and Computer Engineering University of British Columbia Canada Department of Network Engineering Dalian University of Technology China

ISBN: (纸本)9781450335188

Improving the channel utilization is a significant issue to enhance the performance in WLAN. This paper presents, Pillow Talks MAC (PT-MAC), a novel spectrum sharing mechanism to create an extra channel (pt-channel) for client- to-client transmission in WLAN. Obviously, The basic chal- lenge in our proposal is how pt-channel works concurrently and transparently with AP transmissions. To address the issue, in PT-MAC, selected clients are allowed to contend for pt-channel during uplink transmissions and talk freely under the ongoing downlink transmissions. Based on ad- vanced physical techniques, pt-channel transmitter receives and forwards the AP signals simultaneously within OFDM cyclic prefix, resulting in mixed signals are overheard by re- ceiver in pt-channel. However, the mixed message can be re- covered by pt-decoding system. Simulations and analytical results show that, PT-MAC reuses the spectrum in WLAN and achieves a throughput gain as large as 92% with similar fairness, when the ratio of downlink traffic is about 80%. © 2015 ACM.

关键词： Wireless local area networks (WLAN)

来源：评论

学校读者我要写书评

暂无评论

Lossless coding and visualization of 3-D medical images with lossy preview capability

Bioimaging

引用

Bioimaging 1996年第1期4卷 1-5页

作者： Sahinoglou, Haris Malassiotis, Sotiris Strintzis, Michael G. Information Processing Laboratory Department of Electrical and Computer Engineering University of Thessaloniki Thessaloniki 540 06 Greece

In this paper a combination of lossless and lossy compression techniques is presented for the storage and transmission of 3-D medical images. The lossy version of the data is used for fast preview when browsing through large databases. When only a small region is of interest then the lossless corrections for this region are transmitted. A special structuring of the bit-stream is also adopted to allow visualization directly from the compressed bit-stream.

关键词： 3-D medical images Transmission Visualization

来源：评论

学校读者我要写书评

暂无评论

Local spectrum sensing in non-gaussian noise

Local spectrum sensing in non-gaussian noise

引用

2010 17th International Conference on Telecommunications, ICT 2010

作者： Zahabi, Sayed Jalal Tadaion, Ali A. Department of Electrical and Computer Engineering Statistical Signal Processing Laboratory Yazd University Yazd Iran

ISBN: (纸本)9781424452477

This paper deals with the local spectrum sensing problem in non-Gaussian noise. It is of great importance to reliably detect the presence of licensed users in cognitive radio. This task highly depends on the noise distribution, thus it is important to characterize the noise behavior as best as possible. Although Gaussian assumption for noise is of interest due to many reasons, it sometimes fails to model the behavior of noise in practice. In this paper we present a local spectrum sensing scheme in a broad family of non-Gaussian noise. We reasonably assume that the Primary User (PU) signal is Phase Shift Keying (PSK) modulated, where the number of constellation points, M, and the symbol code sequence are unknown to the Secondary Users (SU), as in practice. We also assume that the SUs are unaware of the PU signal complex amplitude and the non- Gaussian noise variance. Within this framework, we obtain the Generalized Likelihood Ratio Test (GLRT) as our spectrum sensing scheme and propose an approximate implementation of the resulting GLRT. Simulation results show that our proposed scheme has an acceptable performance. © 2009 IEEE.

关键词： Cognitive radio

来源：评论

学校读者我要写书评

暂无评论

A comparative study of hierarchical matching algorithms for face recognition

A comparative study of hierarchical matching algorithms for ...

引用

11th IAPR Conference on Machine Vision Applications, MVA 2009

作者： Momeni, Hajar Sadeghi, Mohammad T. Abutalebi, Hamid R. Signal Processing Research Laboratory Department of Electrical and Computer Engineering Yazd University Yazd Iran

ISBN: (纸本)9784901122092

The similarity measure based nearest neighbour classifier is commonly used in object recognition or retrieval systems. The result of a query in such a system is in general the images from the database whose descriptors are closest to the descriptor of the query image. An important issue in large scale recognition systems is the computational burden caused by measuring the similarity of the features derived from the query image with the templates of the database objects. Hierarchical Agglomerative Clustering (HAC) algorithms are considered as a solution to this problem. In these algorithms, a dendrogram is formed down to top in the training stage. In the recognition phase, the query image moves on the dendrogram from the highest level to lower levels in order to find the best matched object. One of the most affecting issues in these algorithms is the strategy used for building the dendrogram. In this paper, different techniques adopted for this purpose are studied and compared within the framework of a face recognition system. Our experimental results demonstrate that using an appropriate merging technique, the average recognition time reduces while the performance of the system is not highly degraded.

关键词： Face recognition

来源：评论

学校读者我要写书评

暂无评论

Efficient data encoder for low-power capsule endoscopy application

Efficient data encoder for low-power capsule endoscopy appli...

引用

International Conference on Information Science, Signal processing and Their Applications

作者： Tajallipour, Ramin Wahid, Khan Multimedia Processing and Prototyping Laboratory Department of Electrical and Computer Engineering University of Saskatchewan SK Canada

ISBN: (纸本)9781424471676

The paper presents an efficient data encoder based on Lempel-Ziv-Welch (LZW) algorithm to be used in a lowpower capsule endoscopic system. The encoder is library-based where the size of the library can be set by the user, and hence, the output data rate can be controlled according to the bandwidth requirement. The simulation is carried out with several endoscopic images and the results show that a minimum overall compression ratio of 92.8% can be achieved with a minimum reconstruction quality of 30dB. The energy consumption has been estimated to be 75uJ/frame. Several other encoding algorithms have been studied and the comparative results are discussed. © 2010 IEEE.

关键词： Energy utilization

来源：评论

学校读者我要写书评

暂无评论

An efficient distributed algorithm for constructing delay- and degree-bounded application-level multicast tree

An efficient distributed algorithm for constructing delay- a...

引用

8th International Symposium on parallel Architectures, Algorithms and Networks, I-SPAN 2005

作者： Feng, Liu Jingshu, Huang Xicheng, Lu Yuxing, Peng National Laboratory for Parallel and Distributed Processing Changsha 410073 China School of Electrical and Computer Engineering Purdue University West Lafayette IN 47907-2035 United States

ISBN: (纸本)0769525091

In this paper we investigate the problem of finding a delay- and degree-bounded maximum sum of nodes application level multicast tree. We then proved the problem is NP-hard, and its relationship with the well-studied degree-bounded minimum maximum-delay multicast tree problem. We propose a distributed algorithm - OverStream, which adopts PPAF heuristic for father node to choose optimal child nodes based on multiple network parameters. Simulation results show that our algorithm is better than OMNI, SpreadIt, HMTP, and Zigzag in general. © 2005 IEEE.

关键词： Algorithms

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：