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Science China(Information Sciences) 2017年第10期60卷 155-168页

作者： Jing YANG Hongyan WANG jie ding Xiqi GAO Zhiguo ding National Mobile Communications Research Laboratory Southeast University School of Information Engineering Yangzhou University Department of Communication Systems Lancaster University

In this work, we investigate the spectral efficiency(SE) and energy efficiency(EE) for a massive multiple-input multiple-output multi-pair two-way amplify-and-forward relaying system, where multi-pair users exchange information via a relay station equipped with large scale antennas. We assume that imperfect channel state information is available and maximum-ratio combining/maximum-ratio transmission beamforming is adopted at the relay station. Considering constant or scaled transmit power of pilot sequences, we quantify the asymptotic SE and EE under general power scaling schemes, in which the transmit power at each user and relay station can both be scaled down, as the number of relay antennas tends to infinity. In addition, a closed-form expression of the SE has been obtained approximately. Our results show that by using massive relay antennas, the transmit power at each user and the relay station can be scaled down, with a non-vanishing signal to interference and noise ratio(SINR). Finally, simulation results confirm the validity of our analysis.

关键词： massive MIMO two-way relaying power scaling imperfect CSI energy efficiency spectral efficiency

A Structure-Preserving JKO Scheme for the SizeModified Poisson-Nernst-Planck-Cahn-Hilliard Equations

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Numerical Mathematics(Theory,Methods and Applications) 2023年第1期16卷 204-229页

作者： jie ding Xiang Ji School of Science Jiangnan UniversityWuxiJiangsu214122China Department of Mathematics and Mathematical Center for Interdiscipline Research Soochow University1 Shizi StreetSuzhou 215006JiangsuChina

In this paper,we propose a structure-preserving numerical scheme for the size-modified Poisson-Nernst-Planck-Cahn-Hilliard(SPNPCH)equations derived from the free energy including electrostatic energies,entropies,steric energies,and Cahn-Hilliard *** on the Jordan-Kinderlehrer-Otto(JKO)framework and the Benamou-Brenier formula of quadratic Wasserstein distance,the SPNPCH equations are transformed into a constrained optimization *** exploiting the convexity of the objective function,we can prove the existence and uniqueness of the numerical solution to the optimization *** conservation and unconditional energy-dissipation are preserved automatically by this ***,by making use of the singularity of the entropy term which keeps the concentration from approaching zero,we can ensure the positivity of *** solve the optimization problem,we apply the quasi-Newton method,which can ensure the positivity of concentration in the iterative *** tests are performed to confirm the anticipated accuracy and the desired physical properties of the developed ***,the proposed scheme can also be applied to study the influence of ionic sizes and gradient energy coefficients on ion distribution.

关键词： Structure-preserving size-modified Poisson-Nernst-Planck-Cahn-Hilliard equations JKO framework positivity

Dynamic Scheduling Policy for Patient Flow in a Smart Environment

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Chinese Journal of Electronics 2017年第3期26卷 530-536页

作者： CHEN Xiao ding jie Nigel Thomas School of Computer Science and Communication Engineering Jiangsu University State Key Laboratory of Software Development Environment Beihang University School of Information Engineering Yangzhou University School of Computing Science Newcastle University

Given the popularity of smart environment in a hospital involving the participation of a large group of patients,scheduling of patients towards their desired destination is still being a challenging *** the development of Internet of Things(Io T),smart environments are increasingly being deployed in various public scenarios and in particular,hospitals are an important target environment for smart *** paper models a dynamic scheduling policy based on a patient flow scenario in order to solve the queuing issue and facilitate people’s *** dynamic scheduling policy aims to forward incoming patients to dissolve jams especially at the peaks by giving accurate predication of appointment *** main modelling technique is a formal method—Performance evaluation process algebra(PEPA).The findings show that the dynamic scheduling policy is able to efficiently improve the patient flow.

关键词： Dynamic scheduling Patient flow Smart environment Formal method Performance evaluation process algebra(PEPA)

A Cooperative MIMO Transmission Scheme for Cluster-based Wireless Sensor Networks

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China Communications 2010年第5期7卷 14-22页

作者： ding jie Liu Danpu Wu Huari Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 P. R. China Beijing Academy of Agriculture and Forestry Sciences Beijing 100097 P. R. China

Wireless sensor network is becoming more and more popular in recent years, but energy- constrained characteristic of sensor nodes is one of the critical issues that we must consider in system design. In this paper, a cluster-based virtual VBLAST transmission scheme is proposed to achieve energy savings for energy-constrained wireless sensor networks. In the proposed scheme, instead of using cluster member as cooperative nodes, multiple cluster heads cooperate to form virtual antenna array so that V-BLAST based virtual MIMO transmission can be implemented. Based on the communication energy consumption model, a way to optimize the parameters for the scheme is given. In addition, detailed simulation is performed to evaluate the performance of the proposed scheme for both densely and sparsely deployed sensor networks. Theoretical analysis and simulation results verify the energy efficiency of the proposed scheme.

关键词： energy efficiency virtual MIMO VBLAST cluster wireless sensor networks

Fast Growth Entire Functions Whose Escaping Set Has Hausdorff Dimension Two

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Chinese Annals of Mathematics,Series B 2019年第4期40卷 481-494页

作者： jie ding Jun WANG Zhuan YE School of Mathematics Taiyuan University of TechnologyTaiyuan 030024China School of Mathematics Fudan UniversityShanghai 200433China Department of Mathematics and Statistics Univeristy of North Carolina WilmingtonWilmingtonNC 28403USA

The authors study a family of transcendental entire functions which lie outside the Eremenko-Lyubich class in general and are of infinity growth order. Most importantly,the authors show that the intersection of Julia set and escaping set of these entire functions has full Hausdorff dimension. As a by-product of the result, the authors also obtain the Hausdorff measure of their escaping set is infinity.

关键词： Dynamic systems Entire function Julia set Escaping set Hausdorff dimension

Realizing Enveloping Algebras via Varieties of Modules

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Acta Mathematica Sinica,English Series 2010年第1期26卷 29-48页

作者： Ming ding jie XIAO Fan XU Department of Mathematics Tsinghua University Beijing 100084~ P. R~ China

By using the Ringel-Hall algebra approach, we investigate the structure of the Lie algebra L（A） generated by indecomposable constructible sets in the varieties of modules for any finite- dimensional C-algebra A. We obtain a geometric realization of the universal enveloping algebra R（A） of L（A）, this generalizes the main result of Riedtmann. We also obtain Green＇s formula in a geometric form for any finite-dimensional C-algebra A and use it to give the comultiplication formula in R（A）.

关键词： Ringel-Hall algebra constructible set variety universal enveloping algebra

Grüneisen ratio quest for self-duality of quantum criticality in a spin-1/2 XY chain with Dzyaloshinskii–Moriya interaction

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Communications in Theoretical Physics 2021年第9期73卷 145-152页

作者： Lin-jie ding Yuan Zhong Department of Physics ChongQing Three Gorges UniversityWanzhou 404100China

The quantum phase transition(QPT)and quantum criticality of an anisotropic spin-1/2 XY chain under the interplay of magnetic field and Dzyaloshinskii-Moriya(DM)interaction,which is interpreted as an electric field,are investigated,wherein the anisotropic parameter plays a similar role as the superconducting pairing gap in the interacting Kitaev topological superconductor model that protects the topological *** is shown that the thermal Drude weight is a good quantity to characterize the gapped(D_(th)=0)and gapless(D_(th)>0)ground *** continuous QPT is marked by a quantum critical point(QCP)associated with entropy accumulation,which is manifested by a characteristic Güneisen ratio(GR)with or without selfduality *** is shown that at a self-dual QCP,the GR keeps a finite value as T→0,while at a general QCP without self-duality symmetry,it displays a power-law temperature dependent divergence:Γ(T,r_(c))∼±T^(−1),which provides a novel thermodynamic means for probing QPT.

关键词： Grüneisen ratio self-duality of quantum critical point XY spin model Dzyaloshinskii-Moriya interaction

Comparative analysis of habitation behavioral patterns in spatial configuration of traditional houses in Anhui;Jiangsu;and Zhejiang provinces of China

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Frontiers of Architectural Research 2020年第1期9卷 54-66页

作者： jie ding Shanshan Ma School of Art Soochow UniversitySuzhouChina School of Art Anhui University of Finance&EconomicsBengbuChina School of Education Soochow UniversitySuzhouChina

This study investigated the categories of spatial characteristics of traditional houses in Anhui,Jiangsu,and Zhejiang provinces of China by applying syntactic theories and conducting a comparative analysis of their different layout *** houses in the three provinces were selected as measurement samples,and statistical analysis of their spatial variables was conducted through SPSS *** showed that the correlation of depth and integration in the Zhejiang and Jiangsu samples are negative,whereas the samples in Anhui show no *** results further indicated that spaces with high rates of utilization in Zhejiang and Jiangsu dwellings are located at low depths in the spatial configurations,whereas the samples from Anhui show opposite *** housing spatial structures reflect various habitation behavioral patterns in this *** and Jiangsu residents interact more closely with outside spaces in their daily lives,whereas Anhui residents have very limited interaction with outside spaces,thereby reflecting two different modes of living behavior,namely,extroversion and introversion.

关键词： Traditional house Behavioral patterns Spatial configuration Anhui Jiangsu and Zhejiang provinces

Estimating the Economics of Electrical Energy Storage Based on Different Policies in China

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Journal of Thermal Science 2020年第2期29卷 352-364页

作者： ding jie XU Yujie WANG Ziyi HU Shan CHEN Haisheng Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China

This paper assesses the value of bulk grid-scale energy storage(GES) technologies in six electric power districts of China. The economic feasibility of GES under three different types of compensation mechanisms was analyzed. Based on a careful investigation of China’s existing power system, a unit commitment model that comprehensively reflects the production costs(including reduction of fuel consumption, grid loss, ancillary services and so on) of the entire power grid has been proposed. The benefits of GES can be obtained by comparing the production costs of two different scenarios: with and without GES. Results show that under the current scheduling methods and compensation mechanisms, in most provinces in China, the energy storage’s revenue is lower than the value that it brings.

关键词： energy storage Chinese power market economic assessment benefit estimation policy comparison

Highly π-extended copolymer as additive-free hole- transport material for perovskite solar cells

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Nano Research 2018年第1期11卷 185-194页

作者： jie Liu Qianqing Ge Weifeng Zhang Jingyuan Ma jie ding Gui Yu Jinsong Hu Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CASResearch/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing 100049 China

Organolead halide perovskite solar ceils have achieved a certified power- conversion efficiency （PCE） of 22.1% and are thus among the most promising candidates for next-generation photovoltaic devices. To date, most high-efficiency perovskite solar cells have employed arylamine-based hole-transport materials （HTMs）, which are expensive and have a low mobility. The complicated doping procedures and the potentially stability-adverse dopants used in these HTMs are among the major bottlenecks for the commercialization of perovskite solar cells （PSCs）. Herein, we present a polythiophene-based copolymer （PDVT-10） with a hole mobility up to 8.2 cm2-V-l.s-1 and a highest occupied molecular orbital level of -5.28 eV as a hole-transport layer （HTL） for a PSC. A device based on this new HTM exhibited a high PCE of 13.4% under 100 mW-cm-2 illumination, which is one of the highest PCEs reported for the dopant-free polymer-based HTLs. Moreover, PDVT-10 exhibited good solution processability, decent air stability, and thermal stability, making it a promising candidate as an HTM for PSCs.

关键词： perovskite solar cell hole-transport layer dopant-free PDVT-IO stability