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Asymptotic Estimates to Non-global Solutions of a Multi-coupled Parabolic System

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Acta Mathematica Sinica,English Series 2008年第10期24卷 1713-1726页

作者： Rui hong ji Si Ning ZHENG Department of Applied Mathematics Dalian University of Technology Dalian 116024 P. R. China

This paper deals with asymptotic behavior of solutions to a parabolic system, where two heat equations with inner absorptions are multi-coupled via inner sources and boundary flux. We determine four kinds of simultaneous blow-up rates under different dominations of nonlinearities in the model. Two characteristic algebraic systems associated with the problem are introduced to get very simple descriptions for the four simultaneous blow-up rates as well as the known critical exponents, respectively. It is observed that the blow-up rates are independent of the nonlinear inner absorptions.

关键词： simultaneous blow-up rates asymptotic estimates characteristic algebraic system multicoupled parabolic system non-global solution critical exponent

Energy efficiency based multi-relay selection and power allocation in OFDM cooperation networks

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The Journal of China Universities of Posts and Telecommunications 2014年第3期21卷 10-17页

作者： WANG Rui ji hong LI Xi Key Laboratory of Universal Wireless Communications Beijing University of Posts and Telecommunications

Getting along with the improvement of green communications, the energy efficiency （EE） of wireless network becomes more and more important. However, in nmlti-relay-assisted systems, the related work obviously depends on the end-to-end performance, whereas EE of relays has not attracted enough attention. The authors propose an orthogonal frequency division multiplexing （OFDM） multi-relay system based on amplify and forward （AF） mode. Taking incorporating EE and remaining energy as factor, decision criteria of attending cooperation is designed. The EE based asynchronous power iteration method is presented, and the existence and convergence of nash equilibrium （NE） is proven. Furthermore, a joint algorithm in subcarrier pairing, relay selection and power allocation is given. Genetic algorithm （GA） and iteration method are integrated to improve the convergence speed additionally. Simulation demonstrates the obvious improvement of EE, decrease of power consumption and increase of lifetime in relays of this algorithm with the constraint of minimum data transmission rate.

关键词： EE OFDM Multi-relay selection power allocation subcarrier pairing

Delay-aware downlink beamforming with discrete rate adaptation for green cloud radio access network

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The Journal of China Universities of Posts and Telecommunications 2017年第1期24卷 26-34页

作者： Yu Zhi Wang Ke ji hong School of Telecommunication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

With the popularity of variety delay-sensitive services, how to guarantee the delay requirements for mobile users （MUs） is a great challenge for downlink beamformer design in green cloud radio access networks （C-RANs）. In this paper, we consider the problem of the delay-aware downlink beamforming with discrete rate adaptation to minimize the power consumption of C-RANs. We address the problem via a mixed integer nonlinear program （MINLP）, and then reformulate the MINLP problem as a mixed integer second-order cone program （MI-SOCP）, which is a convex program when the integer variables are relaxed as continuous ones. Based on this formulation, a deflation algorithm, whose computational complexity is polynomial, is proposed to derive the suboptimal solution. The simulation results are presented to validate the effectiveness of our proposed algorithm.

关键词： C-RAN delay-aware downlink beamfoming discrete rate adaptation green communication mixed integer second-order cone programming

Energy-efficient joint relay node selection and power allocation over multihop relaying cellular networks toward LTE-Advanced

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The Journal of China Universities of Posts and Telecommunications 2011年第3期18卷 1-7页

作者： CHEN Dan ji hong LI Xi College of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

Cooperative relaying is emerging as an effective technology to fulfill requirements on high data rate coverage in next-generation cellular networks, like long term evolution-advanced （LTE-Advanced）. In this paper, we propose a distributed joint relay node （RN） selection and power allocation scheme over multihop relaying cellular networks toward LTE-Advanced, taking both the wireless channel state and RNs＇ residual energy into consideration. We formulate the multihop relaying cellular network as a restless bandit system. The first-order finite-state Markov chain is used to characterize the time-varying channel and residual energy state transitions. With this stochastic optimization formulation, the optimal policy has indexability property that dramatically reduces the computational complexity. Simulation results demonstrate that the proposed scheme can efficiently enhance the expected system reward, compared with other existing algorithms.

关键词： cooperative relaying LTE-Advanced relay selection power allocation residual energy restless bandit

Agrobacterium tumefaciens-mediated genetic transformation of the phytopathogenic fungus Penicillium digitatum

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第10期9卷 823-828页

作者： ji-ye WANG hong-ye LI Institute of Biotechnology Zhejiang University Hangzhou 310029 China

Agrobacterium tumefaciens-mediated transformation (ATMT) system was assessed for conducting insertional mutagenesis in Penicillium digitatum, a major fungal pathogen infecting post-harvest citrus fruits. A transformation efficiency of up to 60 transformants per 106 conidia was achieved by this system. The integration of the hph gene into the fungal genome was verified by polymerase chain reaction (PCR) amplification and sequencing. These transformants tested were also shown to be mitotically stable. Southern blot analysis of 14 randomly selected transformants showed that the hph gene was randomly integrated as single copy into the fungal genome of P. digitatum. Thus, we conclude that ATMT of P. digitatum could be used as an alter-natively practical genetic tool for conducting insertional mutagenesis in P. digitatum to study functional genomics.

关键词： Penicillium digitatum Agrobacterium tumefaciens-mediated transformation (ATMT) Hygromycin B resistance gene lnsertional mutagenesis

A Creative Computing Approach to Film-story Creation:A Proposed Theoretical Framework

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International Journal of Automation and computing 2020年第5期17卷 678-690页

作者： hong-Wei Liu hong-Rui Liu hong-ji Yang En-Ze Yu Tianjin Foreign Studies University Tianjin 300204China San Jose State University San Jose 95192USA University of Leicester Leicester LE17RHEngland South China Business College Guangdong University of Foreign StudiesGuangzhou 510545China

The film industry is currently witnessing a severe shortage of good stories and a decline in storytelling ***,creative computing has been employed successfully in the humanities,especially in the fields of *** the similarities between the process of film-story creation and that of creative computing,we propose a theoretical framework across the two domains,where the exploratory,the combinational and the transformational rules are jointly utilized to generate new ideas and provide potential options in film-story *** framework consists of a film knowledge library,a creative computing system,an evaluation model and an output *** combination of creative computing and film story creation not only helps to produce novel storylines,shorten the creation cycle,and speed up film industry,but also contributes to the novelty and specificity of interdisciplinary studies.

关键词： Creative computing film-story creation creativity rules automatic generation human-like scriptwriting

从二元社会结构视角看地方农业产业转型升级——以陕西省猕猴桃产业为例

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三峡大学学报（人文社会科学版） 2025年第1期47卷 47-56页

作者：张继焦薛晓宏中国社会科学院大学社会与民族学院北京102488 中国社会科学院民族学与人类学研究所北京100081 中国社会科学院大学马克思主义学院北京102488

近年来,乡村产业振兴备受重视,许多地方都在致力于推动当地特色农业产业转型与升级,希望从区域走向全国乃至世界。但是现实中却发现很多地区特色农业产业的转型与升级面临着许多制约因素,那如何才能推动区域特色农业产业实现转型与升级... 详细信息

近年来,乡村产业振兴备受重视,许多地方都在致力于推动当地特色农业产业转型与升级,希望从区域走向全国乃至世界。但是现实中却发现很多地区特色农业产业的转型与升级面临着许多制约因素,那如何才能推动区域特色农业产业实现转型与升级,将区域特色农业产业推向全国呢?从二元社会结构视角,采用“伞式社会”和“蜂窝式社会”这一对概念,对陕西省猕猴桃产业发展历程进行阶段上的划分,详细分析了不同阶段官方“伞式社会”和民间“蜂窝式社会”力量的作用。通过不同阶段两种力量结构和功能的动态演变过程的分析,可以看到在每一阶段,找到官方“伞式社会”和民间“蜂窝式社会”二者发挥作用的结合点非常重要,双方都是可以发挥强大作用的主体,但是任何一方的单打独斗都无法在如今完成本区域农业产业的转型和升级,只有二者“高程度、高默契”的协同才能完成一个区域农业产业从传统向现代的转变,实现产业的转型与升级,从而实现从“区域到全国性”的跨越。

关键词：二元社会结构 “伞式社会” “蜂窝式社会” 陕西省猕猴桃产业

Asymmetric neutron stars in the presence of vacuum fluctuations

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Nuclear Science and Techniques 2016年第1期27卷 111-116页

作者： hong-Hui Guan Chen Wu ji-Feng Yang Department of Physics East China Normal University Shanghai Institute of Applied Physics Chinese Academy of Sciences Kavli Institute for Theoretical Physics China Chinese Academy of Sciences

The asymmetric neutron stars are investigated in a relativistic effective model with vacuum fluctuations(VF) taken into account. Due to the VF effects, various properties of the neutron matter become ‘softened' comparing to that obtained in the FSUGold model, and the maximum mass of the enpelT neutron stars is reduced from1.71 M to 1:35M.

关键词：真空涨落中子星非对称中子物质最大质量相对论不对称 COM

Evaluation of model checkers by verifying message passing programs

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Science China(Information Sciences) 2019年第10期62卷 6-30页

作者： Weijiang hong Zhenbang CHEN Hengbiao YU ji WANG College of Computer National University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology

Benchmarks and evaluation are important for the development of techniques and tools. Studies regarding evaluation of model checkers by large-scale benchmarks are few. The lack of such studies is mainly because of the language difference of existing model checkers and the requirement of intensive labor in building models. In this study, we present a large-scale benchmark for evaluating model checkers whose inputs are concurrent models. The benchmark consists of 2318 models that are generated automatically from real-world message passing interface(MPI) programs. The complexities of the models have been inspected to be well distributed and suitable for evaluating model checkers. Based on the benchmark, we have evaluated five state-of-the-art model checkers, i.e., PAT, FDR, Spin, PRISM, and NuSMV, by verifying the deadlock freedom property. The evaluation results demonstrate the ability and performance difference of these model checkers in verifying message passing programs.

关键词： model checker evaluation benchmark MPI symbolic execution