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检索条件"机构=Department of Computer and Digital System Engineering"

共 208 条记录，以下是71-80 订阅

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Multiple line outage detection for smart grid: A block-wise compressive sensing perspective

Multiple line outage detection for smart grid: A block-wise ...

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IEEE International Conference on Smart Grid Communications (SmartGridComm)

作者： Jingbo Tan Fang Yang Changyong Pan Jian Song Zhu Han Department of Electronic Engineering & Research Tsinghua University Beijing P. R. China Shenzhen City Key Laboratory of Digital TV System (Guangdong Province Key Laboratory of Digital TV System) Department of Electrical and Computer Engineering University of Houston Houston TX

ISBN: (纸本)9781509040766

Smart grids (SGs), which can fully detect and monitor electrical parameters and user behaviours, have become a development trend of power networks. With larger scale and access of new energy, SGs become more vulnerable and unstable. Under this circumstance, unexpected line outages may cause more harm in SGs than in traditional power grids. Thus, accurate and fast localization of line outages is one of the major tasks and challenges in SGs. By exploiting the sparsity of line outages and phase information from phase measurement units (PMUs), compressive sensing (CS) has been introduced into line outage detection recently. In this paper, we propose a novel block-wise CS based multiple line outage detection scheme for SGs. First, by utilizing the sparsity of line outages and connection relation of the power grid, a new reactance model is derived, making the block-wise CS applicable. Then, we modify the traditional CS algorithm by redefining the selection criterion. The proposed scheme can achieve better precision as well as less complexity compared to the conventional schemes.

关键词： Smart grids Mathematical model Matrix decomposition Coherence Phasor measurement units Complexity theory Matching pursuit algorithms

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A bandwidth reduction scheme for 3D texture-based volume rendering on commodity graphics hardware

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International Conference on Computational Science and its Applications, ICCSA 2004

作者： Lee, Won-Jong Park, Woo-Chan Kim, Jung-Woo Han, Tack-Don Yang, Sung-Bong Neelamkavil, Francis Media System Laboratory Department of Computer Science Yonsei University Seoul120-749 Korea Republic of School of Computer Engineering Department of Internet Engineering Sejong University Seoul143-747 Korea Republic of Digital Media R and D Center Samsung Electronics 416 Maetan-3Dong Paldal-Gu Suwon City442-742 Korea Republic of

ISBN: (纸本)3540220569

In this paper, we propose a bandwidth-effective volume rendering scheme which subdivides the volume into the sub-volumes and transmits them to the texture units in visibility order. Each sub-volume is rendered in the same manner as the original volume on the graphics hardware and the corresponding sub-image is blended in the alpha blending unit. The sub-volume oriented processing improves the cache efficiency and allows empty space skipping. Moreover, it is capable of rendering volume datasets that do not fit into the texture memory. Simulations show that the proposed scheme is effective for 3D texture-based volume rendering on commodity graphics hardware by reducing memory bandwidth up to 30 times when compared with the traditional method. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Volume rendering

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digital engineering school on the way to digital production 1

Digital engineering school on the way to digital production

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1st International Scientific Conference on Advances in Science, engineering and digital Education, ASEDU 2020

作者： Kovshov, E.E. Lesin, S.M. Kuvshinnikov, V.S. JSC "Research and Development Institute of Construction Technology - tomstroy" Scientific Engineering and Educational Laboratory of Digital Computer Systems and Automation Moscow Russia Moscow City University Laboratory of Research of Educational Policy of Department of the Strategic Growth Institute of System Projects Laboratory of Professional Development in Education Moscow Russia

Identifies approaches for improving and enhancing the quality of pre, basic, and additional school' engineering education according to key paradigm "Industry 4.0" based on the development and wide application of information and communication technology with opportunities in research areas of Industrial Informatics. As an example of implementation, innovative research and educational project of the digital engineering school is considered, including designed for the practical implementation of continuous engineering education "School-University-Enterprise". The main objectives of the project "digital engineering school" are formulated and disclosed, the approach to teaching programming in high-level languages using microcontrollers and microprocessor technology is highlighted, practical recommendations are given for its implementation in the structure of school education for both students and teachers. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： engineering education

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An Access Control Mechanism Based on Risk Prediction for the IoV 91

An Access Control Mechanism Based on Risk Prediction for the...

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91st IEEE Vehicular Technology Conference, VTC Spring 2020

作者： Liu, Yuanni Xiao, Man Zhou, Yanyan Zhang, Di Zhang, Jianhui Gacanin, Haris Pan, Jianli Chongqing University of Posts and Telecommunications Chongqing China Zhengzhou University Zhengzhou China National Digital Switching System Engineering Technological Rd Center China Nokia Bell Labs Antwerp Belgium University of Missouri-St.Louis Department of Mathematics and Computer Science MO United States

ISBN: (纸本)9781728152073

The information sharing among vehicles provides intelligent transport applications in the Internet of Vehicles (IoV), such as self-driving and traffic awareness. However, due to the openness of the wireless communication (e.g., DSRC), the integrity, confidentiality and availability of information resources are easy to be hacked by illegal access, which threatens the security of the related IoV applications. In this paper, we propose a novel Risk Prediction-Based Access Control model, named RPBAC, which assigns the access rights to a node by predicting the risk level. Considering the impact of limited training datasets on prediction accuracy, we first introduce the Generative Adversarial Network (GAN) in our risk prediction module. The GAN increases the items of training sets to train the Neural Network, which is used to predict the risk level of vehicles. In addition, focusing on the problem of pattern collapse and gradient disappearance in the traditional GAN, we develop a combined GAN based on Wasserstein distance, named WCGAN, to improve the convergence time of the training model. The simulation results show that the WCGAN has a faster convergence speed than the traditional GAN, and the datasets generated by WCGAN have a higher similarity with real datasets. Moreover, the Neural Network (NN) trained with the datasets generated by WCGAN and real datasets (NN-WCGAN) performs a faster speed of training, a higher prediction accuracy and a lower false negative rate than the Neural Network trained with the datasets generated by GAN and real datasets (NN-GAN), and the Neural Network trained with the real datasets (NN). Additionally, the RPBAC model can improve the accuracy of access control to a great extent. © 2020 IEEE.

关键词： Generative adversarial networks

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A mixed norm image restoration

A mixed norm image restoration

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IEEE International Conference on Image Processing

作者： Min-Cheol Hong T. Stathaki A.K. Katsaggelos Department of Electrical and Computer Engineering Northwestern University Evanston IL USA Signal Processing and Digital System Section Imperial College London UK

In this paper, we propose an iterative mixed norm image restoration algorithm. A functional which combines the least mean squares (LMS) and the least mean fourth (LMF) functionals is proposed. A function of the kurtosis is used to determine the relative importance between the LMS and the LMF functionals. An iterative algorithm is utilized for obtaining a solution and its convergence is analyzed. Experimental results demonstrate the capability of the proposed approach.

关键词： Image restoration Least squares approximation Degradation Signal processing algorithms Iterative algorithms Algorithm design and analysis Gaussian noise Adaptive filters Additive noise digital signal processing

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An iterative mixed norm image restoration algorithm

An iterative mixed norm image restoration algorithm

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IEEE Signal Processing Workshop on Higher-Order Statistics

作者： Min-Cheol Hong T. Stathaki A.K. Katsaggelos Department of Electrical & Computer Engineering Northwestern University Evanston IL USA Signal Processing and Digital System Section Imperial College London UK

关键词： Image restoration Iterative algorithms Least squares approximation Degradation Signal processing algorithms Gaussian noise Algorithm design and analysis Adaptive filters Additive noise Gaussian distribution

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Joint Power and Rate Adaptation aided Network-Coded PSK for Two-way Relaying over Fading Channels

Joint Power and Rate Adaptation aided Network-Coded PSK for ...

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IEEE International Conference on Communications

作者： Yanping Yang Wei Chen Ou Li Ke Ke Lajos Hanzo National Digital Switching System Engineering and Technological R&D Center Department of Electronic Engineering Tsinghua University School of Electronics and Computer Science University of Southampton

ISBN: (纸本)9781467364300

Advanced downlink (DL) decode-and-forward two-way relaying (DF-TWR) is developed for the sake of maximizing the attainable spectral efficiency. Network-coded phase-shift keying (NC-PSK) holds the potential of significantly increasing the data rate of the network, while adaptive modulation is a powerful technique of improving both the energy and spectral efficiency. Hence power-controlled adaptive NC-PSK has the potential of achieving performance enhancements over fading channels. Given this framework, based on the bit-error-ratio (BER) bounds developed, we derive the closed-form spectral efficiency for a continuous-rate, continuous-power adaptive NC-PSK scheme, where both the transmit power and the transmit rate are optimized subject to specific power- and BER- constraints. We then conceive and investigate a discrete-rate scheme relying on a pair of solutions proposed for maximizing the throughput of the network. Our simulation results reveal that the proposed schemes are capable of achieving a higher spectral efficiency than their fixed-power counterparts.

关键词： Fading Bit error rate Optimization Modulation Receivers Bandwidth Signal to noise ratio

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A Continuous Authentication system Based on User Behavior Analysis

A Continuous Authentication System Based on User Behavior An...

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International Conference on Availability, Reliability and Security, ARES

作者： Ines Brosso Alessandro La Neve Graça Bressan Wilson Vicente Ruggiero College of Computation and Informatic Mackenzie Presbyterian University Sao Paulo SP Brazil Department of Electrical Engineering Centro Universitário da FEI Sao Paulo SP Brazil Laboratory of Computer Architecture and Networks Department of Computer and Digital System Engineering Polytechnic School of São Paulo University Brazil Laboratory of Computer Architecture and Networks Department of Computer and Digital System Engineering Polytechnic School of São Paulo University Brazil

ISBN: (纸本)9781424458790

This paper presents a continuous authentication system based on user behavior analysis that makes use of environmental context information, users' behavior analysis and Neuro-Fuzzy Logic. This system must be able to acquire information in context, making them into a computational environment. This information is the basis of user behavior. The system, based on the evidences of the behavior, establishes if it can trust the user or not. According to the user behavior, levels of trust are released, to access the application software. Weights are attributed in the fuzzyfication process, according to the rules that were previously established for the parameters which help to establish the evidences of behavioral trust, in its different degrees. The neuro-fuzzy logic allows that the user behavioral database be continuously updated, interacting with the fuzzyfication mechanism, so as to keep trust levels updated according to the user behavior, in a more accurate and faithful way.

关键词： Authentication Application software Information analysis Information security Logic Signal analysis Humans computer security computer networks Electronic mail

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An Approach to Privacy Enhancement for Access Control Model in Web 3.0

An Approach to Privacy Enhancement for Access Control Model ...

引用

International Conference on Convergence Information Technology

作者： Eun-Ae Cho Chang-Joo Moon Dae-Ha Park Doo-Kwon Baik Department of Computer Science & Engineering Korea University Seoul South Korea Department of Aerospace Information System Engineering Konkuk University Seoul South Korea Department of Computer and Information Science Korea Digital University Seoul South Korea

The recent Web technology has been developed by three mainsprings which include integration, virtualization, and socialization. The Web technology provides the increment of the social networking ability. However it deepens the exposure of privacy about personal information as more complicating and difficult problems. Representatively, it is impossible to define and manage the specific relation, so the personal information and interest can be inferred from collecting and summarizing the contents. Also, there are some problems that it is hard to construct the information owner's own social network. Thus this paper proposes the new access control model which enhances the user privacy of the existing access control methods in web 2.0. This method prevents privacy such as personal inclination from being exposed and enables to define and manage the specific relation. By doing this the information owners can construct their social network. This social network can be applied and extended to Web contents.

关键词： Privacy Access control Social network services Protection Information services Web sites Internet Content management Service oriented architecture Information technology

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Integrating MPEG-7 descriptors and pattern recognition: an environment for multimedia indexing and searching

Integrating MPEG-7 descriptors and pattern recognition: an e...

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Proceedings of the Latin American Web Congress (LA-Web)

作者： R. Matushima D.M. Hiramatsu R.M. Silveira W.V. Ruggiero C.E.M. da Costa M.M. Monteiro C. Hatori LARC-Laboratory of Computer Architecture and Networks Department of Computer and Digital System Engineering Escola Politécnica da Universidade de São Paulo Brazil Department of Computer Engineering and Digital System Escola Politécnica da Universidade de São Paulo Brazil Fundaćão Padre Anchieta Radio e TV Cultura Sao Paulo Brazil

This paper describes a music searching system based on an automatic indexing process created over a pattern recognition tool and MPEG-7 standard. We present a complete analysis of the involved technologies integration process and show a reference measure in the feasibility of this kind of application not only in the research environment but also in the production of real systems.

关键词： MPEG 7 Standard Pattern recognition Indexing TV Data mining computer networks digital systems systems engineering and theory Libraries Humans

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