检索结果-内蒙古大学图书馆

作者： Zheng, Lin University of Waterloo

学位级别：master

Due to the sheer volume of data involved, video coding is an important application of lossy source coding, and has received wide industrial interest and support as evidenced by the development and success of a series of video coding standards. All MPEG-series and H-series video coding standards proposed so far are based upon a video coding paradigm called predictive video coding, where video source frames X?,i=1,2,...,N, are encoded in a frame by frame manner, the encoder and decoder for each frame X?, i =1, 2, ..., N, enlist help only from all previous encoded frames Sj, j=1, 2, ..., *** this thesis, we will look further beyond all existing and proposed video coding standards, and introduce a new coding paradigm called causal video coding, in which the encoder for each frame X? can use all previous original frames Xj, j=1, 2, ..., i-1, and all previousencoded frames Sj, while the corresponding decoder can use only allprevious encoded frames. We consider all studies, comparisons, and designs on causal video codingfrom an information theoreticpoint of view. Let R*c(D?,...,D_N) (R*p(D?,...,D_N), respectively) denote the minimum total rate required to achieve a given distortion level D?,...,D_N > 0 in causal video coding (predictive video coding, respectively). A novel computationapproach is proposed to analytically characterize, numerically compute, and compare the minimum total rate of causal video coding R*c(D?,...,D_N) required to achieve a given distortion (quality) level D?,...,D_N > ***, we first show that for jointly stationary and ergodicsources X?, ..., X_N, R*c(D?,...,D_N) is equalto the infimum of the n-th order total rate distortion functionR_{c,n}(D?,...,D_N) over all n, whereR_{c,n}(D?,...,D_N) itself is given by the minimum of aninformation quantity over a set of auxiliary random variables. Wethen present an iterative algorithm for computingR_{c,n}(D?,...,D_N) and demonstrate the convergence of thealgorithm to the global minimum. The gl

关键词： causal video coding iterative algorithm multi-user information theory predictive video coding rate distortion theory more and less coding theorem

来源：评论

学校读者我要写书评

暂无评论

Secure IRS-Aided Cognitive UAV Communications 23

Secure IRS-Aided Cognitive UAV Communications

引用

23rd IEEE International Conference on Communication Technology, ICCT 2023

作者： Li, An Guo, Tao Wu, Qingqing Wang, Zhiwei Yan, Liyan Hong, Sheng Nanchang University Department of Electronic Information Engineering Nanchang330031 China Shanghai Jiao Tong University Department of Electronic Engineering Shanghai200240 China

ISBN: (纸本)9798350325959

In this article, we study a novel intelligent reflecting surface (IRS)-aided cognitive unmanned aerial vehicle (Co-UAV) secure communication network, in which an IRS is exploited to improve the information transmit security. Our goal is to optimize the IRS's phase shifts, the UAV's transmit power and trajectory jointly. Aiming at the non-convex and intractable nature of this optimization objective, we present an effective iterative algorithm by combining alternating optimization (AO) technique and successive convex approximation (SCA) method so as to acquire a local suboptimal solution. Simulation results confirm the proposed algorithm is effective in significantly improving the secondary secrecy performance assisted by IRS subject to the interference temperature limit on the primary user. © 2023 IEEE.

关键词： Cognitive unmanned aerial vehicle (Co-UAV) communication intelligent reflecting surface iterative algorithm physical layer security power control

来源：评论

学校读者我要写书评

暂无评论

The notre dame turbomachinery laboratory: Research through combined academic programs and industrial testing 53

The notre dame turbomachinery laboratory: Research through c...

引用

53rd AIAA/SAE/ASEE Joint Propulsion Conference, 2017

作者： Morris, Scott C. Cameron, Joshua D. Jemcov, Alekandar University of Notre Dame Aerospace and Mechanical Engineering Notre DameIN46556 United States

来源：评论

学校读者我要写书评

暂无评论

EXISTENCE AND algorithm OF SOLUTIONS FOR GENERALIZED STRONGLY MIXED IMPLICIT QUASI-VARIATIONAL INEQUALITIES

引用

Journal of Systems Science & Complexity 2004年第4期17卷 500-510页

作者： ZENGLuchuan DepartmentofMathematics ShanghaiNormalUniversityShanghai200234China

The purpose of this paper is to introduce and study a new class of generalized strongly mixed implicit quasi-variational inequalities in Hilbert spaces, which includes the known class of generalized mixed implicit quasi-variational inequalities as a special *** applying the auxiliary variational principle technique, the existence of solutions for this class of quasi-variational inequalities is proved. Moreover, a new iterative algorithm for computing approximate solutions is constructed and the convergence criteria for this iterative algorithm are also established.

关键词： generalized strongly mixed implicit quasi-variational inequality auxiliaryvariational principle technique iterative algorithm

来源：评论

学校读者我要写书评

暂无评论

The Reconstruction Research of 3D Temperature Field of Flame of the Optical Fiber Taper Machine Based on the Multispectral Radiation

The Reconstruction Research of 3D Temperature Field of Flame...

引用

2nd International Conference on Measurement, Information and Control (ICMIC)

作者： Zhang Zhilin Sun Weimin Xing Jian Cui Shuanglong Harbin Engn Univ Harbin 150001 Peoples R China

ISBN: (纸本)9781479913909

A novel iterative reconstruction algorithm is proposed in this paper. The experiment of the optical fiber taper machine flame has been carried on, and the measurements on the front and profile of flame of the optical fiber tapering machine have been conducted at different heights. The reconstructions of 3D surface diagram and isotherm diagram of the flame have been processed by using SIRT-TVM-DART joint reconstruction algorithm. At last the uncertainty is analyzed.

关键词： multispectral thermometry 3D temperature field iterative algorithm

来源：评论

学校读者我要写书评

暂无评论

Face image restoration based on statistical prior and image blur measure

Face image restoration based on statistical prior and image ...

引用

4th International Conference on Multimedia and Expo (ICME 2003)

作者： Fan, X Zhang, Q Liang, DQ Zhao, L Xi An Jiao Tong Univ Inst Image Proc & Recognit Xian Peoples R China

ISBN: (纸本)0780379659

In practice, we meet numerous image restoration problems, particularly those on face images. An approach to image restoration based on statistical prior of faces and image blur measure is presented in this paper. The novelty of the approach is twofold: 1) the prior on the shape and appearance of a face represented as statistical models is incorporated into the regularized image restoration formulation. Moreover, an iterative algorithm is given to provide a numerical solution. 2) an image blur measure is defined to describe the blur nature of an image. The measure is evaluated at each step of the iteration process to determine the weight of the constraint introduced by the statistical prior. Both subjective and objective comparisons of the restoration results indicate great improvements on image preservation and noise suppression.

关键词： image restoration statistical analysis iterative methods interference suppression face image restoration image blur measure statistical models iterative algorithm image preservation noise suppression subjective comparison objective comparison

来源：评论

学校读者我要写书评

暂无评论

The influence of burstiness and correlation of traffic on an ATM multiplexer

The influence of burstiness and correlation of traffic on an...

引用

1996 International Conference on Communication Technology

作者： Liao, JX Li, LM Sun, HR UNIV ELECT SCI & TECHNOL CHINA NATL KEY LAB OPT FIBER COMMUNCHENGDU 610054PEOPLES R CHINA

ISBN: (纸本)7505336355

This paper presents a traffic model for an ATM multiplexer providing video, voice, image, and data services. The traffic model classifies the input traffic into two types: real-time and non-real-time. The input process for real-time traffic is a Markov modulated Bernoulli process (MMBP), while that for non-real-time traffic is a Bernoulli process with batches. The z-transform of the cell interarrival time A/sub MMBP/(z) is obtained. The average traffic load /spl rho//sub MMBP/ and the squared coefficient of variation of the time between success cell C/sup 2//sub MMBP/ are then obtained from the respective derivatives of A/sub MMBP/(z). The autocorrelation coefficient of the cell interarrival time with lag 1 /spl psi/, can be also obtained. This paper presents an iterative algorithm that can be used to calculate the MMBP probability distribution of the cell interarrival time. So far few results about discrete-time finite buffer queues with correlated inputs are known. This paper analyzes the performance of an ATM multiplexer considering the correlation and burst in cell arrivals. For the MMBP-stream, the waiting time distribution and the cell loss probability for MMBP+M/sup [X]//D/1/K finite buffer system are all exactly calculated with the use of a recursive algorithm. Calculations show the influence of burstiness and correlation on both the loss probability and waiting time. The accuracy of the analytical results has been largely validated by means of a simulation approach.

关键词： asynchronous transfer mode multiplexing equipment telecommunication traffic Markov processes modulation buffer storage correlation methods queueing theory Poisson distribution iterative methods Z transforms ATM multiplexer burstiness correlation traffic model real-time traffic nonreal-time traffic Markov modulated Bernoulli process Bernoulli process z-transform cell interarrival time average traffic load autocorrelation coefficient iterative algorithm probability distribution discrete-time finite buffer queues correlated inputs waiting time distribution cell loss probability recursive algorithm simulation poisson distribution

来源：评论

学校读者我要写书评

暂无评论

The Design and Implementation of a Symmetric Encryption algorithm Based on DES

The Design and Implementation of a Symmetric Encryption Algo...

引用

5th IEEE International Conference on Software Engineering and Service Science (ICSESS)

作者： Zhou Yingbing Li Yongzhen Yanbian Univ Dept Comp Sci & Technol Yanji 133002 Peoples R China

ISBN: (纸本)9781479932795

In this age of explosive growth in information exchanges, there is indeed no time at which security does not matter. One of the symmetric encryption algorithms, DES, has kept its dominant position in the area of data encryption over the last few decades. However, with a rapid development in the field of computer hardware, DES has already been proved insecure. It takes a short time to translate the ciphertext to its corresponding plaintext using brute-force method at a reasonable cost. This is mainly due to the small key size DES employed. Given these issues, the objective of this article is to suggest an alternative on DES to obtain higher security and better execution efficiency by increasing the key size and updating the iteration technique. Comparisons were conducted with both DES and the advanced DES named triple DES (3DES). The results have demonstrated that the proposed algorithm outperforms both previous algorithms.

关键词： DES key expansion iterative algorithm

来源：评论

学校读者我要写书评

暂无评论

Transfer operator-based approach for domain of attraction computation and experimental data analysis

Transfer operator-based approach for domain of attraction co...

引用

作者： Wang, Kai Iowa State University

学位级别：M.S.

We present novel transfer operator-based methods for domain of attraction computation and experimental data analysis of nonlinear systems. The problem of domain of attraction (DA) computation is of great practical interest with applications in various engineering and physical systems such as power system, chemical processes, aircraft control, and biological systems. We propose linear transfer operator-based set-oriented numerical method for DA computation of nonlinear systems. The proposed method overcomes some of the shortcoming of the existing methods of DA computation; in particular the proposed method can be used for DA computation of non-polynomial vector fields and for systems with non-equilibrium dynamics. Proper orthogonal decomposition (POD) is one of the most popular methods currently used for experimental data analysis and reduced order modeling of fluid flow systems. The basic idea behind POD is to decompose the experimental data into dominant energy modes. We present an alternate numerical scheme for spectral-based decomposition of the experimental time series data. The new method is based on the spectral analysis of linear transfer operator constructed from the experimental data. Application of this method is demonstrated on a time series data obtained from the flapping wing micro-aerial vehicle experiment. Future research efforts will focus on application of this method for reduced order modeling of time series data.

关键词： domain of attraction iterative algorithm proper orthogonal decomposition spectral analysis transfer operator Electrical and Computer Engineering

来源：评论

学校读者我要写书评

暂无评论

Robust check loss-based inference of semiparametric models and its application in environmental data

引用

JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS 2020年 365卷 112267-000页

作者： Yang, Jing Lu, Fang Lu, Xuewen Hunan Normal Univ Coll Math & Stat Minist Educ China Key Lab High Performance Comp & Stochast Informat Changsha 410081 Hunan Peoples R China Univ Calgary Dept Math & Stat Calgary AB T2N 1N4 Canada

Composite quantile regression has been shown to be a more competitive method than the well-known mean regression and quantile regression approaches, since it can significantly improve the estimation efficiency for a wide class of errors. In this paper, we propose a profiling composite quantile regression for robust estimation of semiparametric varying-coefficient partially linear model (VCPLM) by combining the ideas of local linear composite quantile regression with the profile technique. Different from the step-wise estimation method considered in Kai et al. (2011), an iterative algorithm is developed for the estimates of parametric and nonparametric functions. Under some mild regularity conditions, we establish the asymptotic normalities of the obtained estimators and further briefly discuss the related asymptotic relative efficiency. Noteworthy, an entirely different way from Kai et al. (2011) is presented to establish the asymptotic normality of the parametric component, which is frequently of the primary interest in VCPLM. Some Monte Carlo simulations with various errors and an environmental data application are conducted to evaluate the finite sample performance of the proposed methodology. (C) 2019 Published by Elsevier B.V.

关键词： Varying coefficient partially linear model Robust inference iterative algorithm Asymptotic properties Environmental data

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：