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Fully Distributed Economic Dispatch for Cyber-physical Power System with Time Delays and Channel Noises

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1472-1481页

作者： Yuhang Zhang ming Ni Yonghui sun College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing 211106China NARI Technology Co. Ltd.Nanjing 211106China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106China

Economic dispatch problem(EDP)is a fundamental optimization problem in power system operation,which aims at minimizing the total generation *** fact,the power grid is becoming a cyber-physical power system(CPPS).Therefore,the quality of communication is a key *** this paper,considering two important factors,i.e.,time delays and channel noises,a fully distributed consensus based algorithm is proposed for solving *** critical maximum allowable upper bounds of heterogeneous communication delays and self-delays are *** should be pointed out that the proposed algorithm can be robust against the time-varying delays and channel noises considering generator *** addition,even with time-varying delays and channel noises,the power balance of supply and demand is not broken during the *** simulation studies are presented to validate the correctness and superiority of the developed results.

关键词： Distributed economic dispatch consensus-based algorithm cyber-physical power system time delay channel noises

Parameter Estimates in Random Intercept Mixed Effects Model for Repeated Measures

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Acta Mathematica Sinica,English Series 2007年第4期23卷 685-696页

作者： Yah sun Gen xiang CHAI School of Economics Shanghai University of Finance and Economics Shanghai 200433 P. R. China Department of Applied Mathematics Tongji University Shanghai 200092 P. R. China

In this article the following random intercept mixed effects model will be considered： yij = vi =v^τijβ＋ εij,i=1,…,m;j=1,2,…,ni, where {vi} are i.i.d, random effects with mean α 2. 2 and finite variance σ^2 v, {εij} are i.i.d, random errors with finite variance ε^2 ε. Here we will estimate α,σ^2 v,σ^2 ε,β and study their large sample properties, such as strong consistency, strong convergence rates and asymptotic normality.

关键词： Repeated measures Random effects Convergence system Strong convergence Strong convergence rate

Admissibility for Linear Estimator of Parameter on Growth Curve Model with Respect to Linear Constraint

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Acta Mathematicae Applicatae Sinica 2009年第1期25卷 171-176页

作者： ming-xiang Cao Fan-chao Kong Department of Mathematics Hefei Teachers College Heifei 230061 China Department of Mathematics Anhui University Hefei 230038 China

By using the vector-method of matrix, we study Growth Curve Model with respect to linear constraint. Under matrix loss function and vector loss function, we obtain necessary and sufficient conditions for admissibility... 详细信息

关键词： Growth curve model linear estimators admissibility

Limit theorems for supremum of Gaussian processes over a random interval

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Applied Mathematics(A Journal of Chinese Universities) 2018年第3期33卷 335-343页

作者： LIN Fu-ming PENG Zuo-xiang School of Statistics and Management Shanghai University of Finance and Economics School of Mathematics and Statistics Sichuan University of Science & Engineering School of Mathematics and Statistics Southwestern University

Let {X(t), t ≥ 0} be a centered stationary Gaussian process with correlation r(t)such that 1-r(t) is asymptotic to a regularly varying function. With T being a nonnegative random variable and independent of X(t), the... 详细信息

关键词： stationary Gaussian process supremum of a process regularly varying functions random intervals

General Admissibility for Linear Estimators in a General Multivariate Linear Model under Balanced Loss Function

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Acta Mathematica Sinica,English Series 2013年第9期29卷 1823-1832页

作者： ming xiang CAO Fan Chao KONG Department of Mathematics Hefei Normal University School of Mathematics Anhui University

A generalization of Zellner’s balanced loss function is proposed. General admissibility in a general multivariate linear model is investigated under the generalized balanced loss function. And the sufficient and necessary conditions for linear estimators to be generally admissible in classes of homogeneous and nonhomogeneous linear estimators are given, respectively.

关键词： Balanced loss function linear estimators general optimality general admissibility

Almost sure limit theorem for the maximum of a class of quasi-stationary sequences

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Applied Mathematics(A Journal of Chinese Universities) 2014年第1期29卷 44-52页

作者： ZHUANG Guang-ming PENG Zuo-xiang School of Mathematical Sciences Liaocheng University School of Automation Nanjing University of Science and Technology School of Mathematics and Statistics Southwest University

This paper investigates the problem of almost sure limit theorem for the maximum of quasi-stationary sequence based on the result of Turkman and Walker. We prove an almost sure limit theorem for the maximum of a class of quasi-stationary sequence under weak dependence conditions of D （uk, un） and αtm,ln = 0 （（log log n）-（1＋ε））.

关键词： quasi-stationary sequence maximum limit distribution almost sure central limit theorem

Fractal Characteristics of Stagnic Anthrosols and the Relationship with Soil Micro-Structure

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Agricultural Sciences in China 2009年第5期8卷 605-612页

作者： XU xiang-ming HE Yu-rong Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 P.R.China Graduate University of the Chinese Academy of Sciences Beijing 100039 P.R. China

The Stagnic Anthrosols developed from quaternary yellow sedimentary parent material occupied an important position in Southwest China. Fractal dimensions of particle size and micro-aggregate size distributions of Stagnie Anthrosols and their relationship to soil micro-structure had been probed. Results showed that the soil particle size distributions were dominated by clay, the fractal dimensions of particle size distributions （Ds） were high and between 2.676-2.925, as the fractal dimensions of micro-aggregate size distributions （Da） were between 2.354-2.853. The fractal dimensions of particlesize distributions were preferably related with the ratio of coarse particles and fine particles （c/f20 ,m） and the micromorphological feature of skeleton grains. The evolution degree of micro-structure among horizons were reflected by the coefficient of variation of Ds within the profile. The fractal dimensions of micro-aggregate size distributions were related with the quantities, distributions of micro-aggregates and micro-pores. Results revealed that the soil micro-structures could be quantified by fractal dimensions preliminarily.

关键词： Stagnic Anthrosols micro-aggregate fractal dimension micro-morphology

Resource allocation algorithm with limited feedback for multicast single frequency networks

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第2期13卷 146-154页

作者： ming-wei TANG Xiao-xiang WANG MOE Key Laboratory of Universal Wireless Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

The single frequency network (SFN) can provide a multimedia broadcast multicast service over a large coverage area. However, the application of SFN is still restricted by a large amount of feedback. Therefore, we propose a multicast resource allocation scheme based on limited feedback to maximize the total rate while guaranteeing the quality of service (QoS) requirement of real-time services. In this scheme, we design a user feedback control algorithm to effectively reduce feedback load. The algorithm determines to which base stations the users should report channel state information. We then formulate a joint subcarrier and power allocation issue and find that it has high complexity. Hence, we first distribute subcarriers under the assumption of equal power and develop a proportional allocation strategy to achieve a tradeoff between fairness and QoS. Next, an iterative water-filling power allocation is proposed to fully utilize the limited power. To further decrease complexity, a power iterative scheme is introduced. Simulation results show that the proposed scheme significantly improves system performance while reducing 68% of the feedback overhead. In addition, the power iterative strategy is suitable in practice due to low complexity.

关键词： Multicast Single frequency networks (SFN) Orthogonal frequency division multiplexing access (OFDMA) Resource allocation

Jointly optimizing user clustering,power management,and wireless channel allocation for NOMA-based Internet of Things

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Digital Communications and Networks 2021年第1期7卷 29-36页

作者： xiang sun Liangkun Yu Yin Yang Department of Electrical&Computer Engineering University of New MexicoAlbuquerqueNM87131USA School of Computing Clemson UniversityClemsonSC29634USA

In order to accommodate the large number of Internet of Things(IoT)connections in mobile networks,Non-Orthogonal Multiple Access(NOMA)has been applied as the resource sharing mechanism in mobile access networks to improve the spectrum *** NOMA-based resource management for uplink communications comprises two problems,i.e.,user clustering and power&wireless channel *** clustering refers to assigning users in terms of IoT devices to different clusters(where users in the same cluster are sharing the wireless channels to upload their data),and power&wireless channel allocation is to optimize the transmission power of the users and the number of wireless channels allocated to the users in a *** two problems are coupled together,thus making it difficult to solve the NOMA-based resource management *** this paper,we propose a QoS-aWarE resourcE managemenT(SWEET)for NOMA algorithm to jointly optimize the user clustering,power management,and wireless channel allocation such that the number of wireless channels is minimized and the data rate requirements of the users can be *** performance of SWEET is validated via extensive simulations.

关键词： NOMA Internet of Things Resource management