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Global Well-Posedness of the BCL System with Viscosity

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Chinese Annals of Mathematics,Series B 2009年第2期30卷 153-172页

作者： Junqi HU department of Applied Mathematics Shanghai University of Finance and Economics Shanghai 200433 China

The BCL system, a kind of equations governing the motion of the free surface of water waves in R3, is studied. Some results on the global existence, uniqueness and regularity of solutions to such system with small ini... 详细信息

关键词： Pseudo-differential operator Water waves Global well-posedness

Scalably Revealing the Dynamics of Soft Community Structure in Complex Networks

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Journal of Systems Science & Complexity 2016年第4期29卷 1071-1088页

作者： LI Huijia LI Huiying School of Management Science and Engineering Central University of Finance and Economics department of Automation Tsinghua University

Revealing the dynamics of community structure is of great concern for scientists from many fields. Specifically, how to quantify the dynamic details of soft community structure is a very interesting topic. In this paper, the authors propose a novel framework to study the scalable dynamic behavior of the soft community structure. First, the authors model the Potts dynamics to detect community structure using a "soft" Markov process. Then the soft stability of in a multiscale view is proposed to naturally uncover the local uniform behavior of spin values across multiple hierarchical levels. Finally, a new partition index is developed to detect fuzzy communities based on the stability and the dynamical information. Experiments on the both synthetically generated and real-world networks verify that the framework can be used to uncover hierarchical community structures effectively and efficiently.

关键词： Community detection dynamical behavior Markov process Potts model soft partition.

Automatic Semantic Analysis of Software Requirements Through Machine Learning and Ontology Approach

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Journal of Shanghai Jiaotong university(Science) 2016年第6期21卷 692-701页

作者：王英林 department of Computer Science and Technology Shanghai University of Finance and Economics

Nowadays,software requirements are still mainly analyzed manually,which has many drawbacks(such as a large amount of labor consumption,inefficiency,and even inaccuracy of the results).The problems are even worse in domain analysis scenarios because a large number of requirements from many users need to be *** this sense,automatic analysis of software requirements can bring benefits to software *** this purpose,we proposed an approach to automatically analyze software requirement specifications(SRSs) and extract the semantic *** this approach,a machine learning and ontology based semantic role labeling(SRL) method was *** of all,some common verbs were calculated from SRS documents in the E-commerce domain,and then semantic frames were designed for those *** on the frames,sentences from SRSs were selected and labeled manually,and the labeled sentences were used as training examples in the machine learning *** the training examples labeled with semantic roles,external ontology knowledge was used to relieve the data sparsity problem and obtain reliable *** on the Sem Cor and Word Net corpus,the senses of nouns and verbs were identified in a sequential manner through the K-nearest neighbor *** the senses of the verbs were used to identify the frame *** that,we trained the SRL labeling classifier with the maximum entropy method,in which we added some new features based on word sense,such as the hypernyms and hyponyms of the word senses in the *** results show that this new approach for automatic functional requirements analysis is effective.

关键词： software requirement engineering semantic role labelling machine learning

Quantum electrodynamics with arbitrary charge on a noncommutative space

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Chinese Physics C 2009年第1期33卷 10-14页

作者：周挽平蔡绍洪隆正文 department of Physics Guizhou University College of finance and economics Guizhou University

Using the Seiberg-Witten map, we obtain a quantum electrodynamics on a noncommutative space, which has arbitrary charge and keep the gauge invariance to at the leading order in theta. The one-loop divergence and Compton scattering are reinvestigated. The noncommutative effects are larger than those in ordinary noncommutative quantum electrodynamics.

关键词： noncommutative quantum electrodynamics charge

The effects of rises in external K^+ on the hyperpolarization-activated cation current I_h in rat dorsal root ganglion neurons

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Science China Chemistry 2009年第8期52卷 1258-1263页

作者： DU ZhengQing WU WenJie ZHOU YuFen department of Environmental Science Shanxi University of Finance and EconomicsTaiyuan 030006China

The effects of rises in external K+(Kext) were examined on the hyperpolarization-activated cation current(Ih) in rat dorsal root ganglion neurons using the whole-cell patch clamp *** results showed that Kext increased Ih in a certain concentration and voltage-dependent *** the basal Kext level(4 mmol/L),Ih had a maximal amplitude of 1085 ± 340 pA which was enhanced by ～45% and ～92% at 8 and 16 mmol/L Kext,*** midpoint activation voltage was significantly shifted from -98 mV in the hyperpolarizing direction by 8 and 12 mV at 8 and 16 mmol/L Kext,respectively with alteration of the activation course of *** short time constants of activation became longer with the increasing amplitude of the command potential upon rises in *** long time constants became *** reversal potentials were shifted in the positive direction without significant alterations upon rises in *** to the functional role of Ih,Kext increased Ih,resulting in an enhanced neuronal excitability,which might produce activation potential abnormality and perhaps neuropathic pain involved.

关键词： hyperpolarization-activated inward current external potassium dorsal root ganglion neurons patch clamp

Risk Management for International Portfolios with Basket Options:A Multi-Stage Stochastic Programming Approach

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Journal of Systems Science & Complexity 2015年第6期28卷 1279-1306页

作者： YIN Libo HAN Liyan School of finance Central University of Finance and EconomicsBeijing 100081 China School of economics and Management Beihang University，Beijing 100191 China.

The authors consider the problem of active international portfolio management with basket options to achieve optimal asset allocation and combined market risk and currency risk management via multi-stage stochastic programming(MSSP). The authors note particularly the novel consideration and signi?cant bene?t of basket options in the context of portfolio optimization and risk *** empirical tests strongly demonstrate that basket options consistently have more clearly improvement on portfolio performances than a portfolio of vanilla options written on the same underlying assets. The authors further show that the MSSP model provides as a supportive tool for asset allocation,and a suitable test bed to empirically investigate the performance of alternative strategies.

关键词： Basket options options applications portfolio optimization risk management stochastic programming

Can whole steps of grain production be outsourced? Empirical analysis based on the three provinces of Jiangsu,Jilin,and Sichuan in China

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Journal of Integrative Agriculture 2024年第1期23卷 336-347页

作者： Jiacheng Liu Shengzhi Mao Qiufen Zheng Zhigang Xu School of finance and Taxation Nanjing University of Finance and EconomicsJiangsu 210023China School of economics Southwestern University of Finance and EconomicsSichuan 611130China School of economics and Management Nanjing Agricultural UniversityJiangsu 210095China

Certain outsourcing services for agricultural management in China,such as pest control in grain production,have experienced prolonged sluggishness,contrasting with the relatively high level of outsourcing services observed in harvesting,land preparation,and *** study examines the feasibility of implementing whole-step outsourcing in grain production by conducting a case study of rice and maize production in Jiangsu,Jilin,and Sichuan provinces in *** provision of outsourcing services hinges on two essential conditions:technological advancements fostering specialized production and economies of scale,coupled with a market size sufficient to realize the aforementioned potential economies of *** results showed that outsourcing pest control or harvesting services had varying economies of *** outsourcing services in pest control were less common than in harvesting services,and their marginal growth space of the economies of scale with technological change was also *** by the operational characteristics of pest control itself,the market scale of its professional services is ***,achieving the whole-step outsourcing of grain production necessitates not only technological innovation but also effective policy interventions to overcome the constraints of market *** interventions include(1)optimizing crop layouts between planning regions and reducing land fragmentation and(2)supplying timely and effective inter-regional agricultural information for service providers aided by information technology.

关键词： outsourcing services economy of scale technical conditions market scale

ON CONVERGENCE PROPERTY OF THE LANCZOS METHOD FOR SOLVING A COMPLEX SHIFTED HERMITIAN LINEAR SYSTEM

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Journal of Computational Mathematics 2013年第3期31卷 326-334页

作者： Guiding Gu department of Applied Mathematics Shanghai University of Finance and Economics Shanghai 200433 China

We discuss the convergence property of the Lanczos method for solving a complex shifted Hermitian linear system （αI ＋ H）x = f. By showing the colinear coefficient of two system＇s residuals, our convergence analysis reveals that under the condition Re（α）＋ λmin（H）〉 0, the method converges faster than that for the real shifted Hermitian linear system （Re（α）I ＋ H）x = f. Numerical experiments verify such convergence property.

关键词： Hermitian matrix Complex shifted linear system Lanczos method.

Nonempty intersection theorems in topological spaces with applications

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Applied Mathematics and Mechanics(English Edition) 2009年第7期30卷 905-914页

作者：方敏黄南京 department of Economic Mathematics South Western University of Finance and Economics department of Mathematics Sichuan University

In this paper, we establish some new nonempty intersection theorems for generalized L-KKM mappings and prove some new fixed point theorems for set-valued mappings under suitable conditions in topological spaces. As applications, an existence theorem for an equilibrium problem with lower and upper bounds and two existence theorems for a quasi-equilibrium problem with lower and upper bounds are obtained in topological spaces. Our results generalize some known results in the literature.

关键词： generalized L-KKM/napping L-diagonally quasi-subspace transfer compactly closed-valued fixed point quasi-equilibrium problem