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Search Results: 1 - 10 of 15971 matches for " PAN Kun "
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About the bound of the C* exponential length
Qingfei Pan,Kun Wang
Mathematics , 2012,
Abstract: In this paper, we give an example to show that, if $u\in C(X)\otimes M_n$ with $\det (u)=1$ then the C* exponential length of $u$ (denoted by $cel(u)$) can not be controlled by $\pi$. Moreover, in the simple inductive limit C*-algebras, similar examples exist.
A Compact Third-order Gas-kinetic Scheme for Compressible Euler and Navier-Stokes Equations
Liang Pan,Kun Xu
Mathematics , 2014,
Abstract: In this paper, a compact third-order gas-kinetic scheme is proposed for the compressible Euler and Navier-Stokes equations. The main reason for the feasibility to develop such a high-order scheme with compact stencil, which involves only neighboring cells, is due to the use of a high-order gas evolution model. Besides the evaluation of the time-dependent flux function across a cell interface, the high-order gas evolution model also provides an accurate time-dependent solution of the flow variables at a cell interface. Therefore, the current scheme not only updates the cell averaged conservative flow variables inside each control volume, but also tracks the flow variables at the cell interface at the next time level. As a result, with both cell averaged and cell interface values the high-order reconstruction in the current scheme can be done compactly. Different from using a weak formulation for high-order accuracy in the Discontinuous Galerkin (DG) method, the current scheme is based on the strong solution, where the flow evolution starting from a piecewise discontinuous high-order initial data is precisely followed. The cell interface time-dependent flow variables can be used for the initial data reconstruction at the beginning of next time step. Even with compact stencil, the current scheme has third-order accuracy in the smooth flow regions, and has favorable shock capturing property in the discontinuous regions. Many test cases are used to validate the current scheme. In comparison with many other high-order schemes, the current method avoids the use of Gaussian points for the flux evaluation along the cell interface and the multi-stage Runge-Kutta time stepping technique.
4-D trajectory prediction model based on data mining
基于数据挖掘的四维飞行轨迹预测模型

WU Kun,PAN Wei,
潘薇

计算机应用 , 2007,
Abstract: Due to the large errors of traditional aerodynamic 4-D trajectory prediction models, a prediction model based on mining flight history data was proposed. Firstly, the factors that had impact on total flying time were found out from flying history, and the flying time of next flight was predicted. Then from the flying position data, the positions where aircraft was located in each sampling period were worked out, and the whole prediction 4-D trajectory was got. Simulation tests prove the accuracy and availability of this model.
Tetrakis(μ-4-tert-butylbenzoato)-κ3O:O,O′;κ3O,O′:O′;κ4O:O′-bis[aquabis(4-tert-butylbenzoato-κ2O,O′)(4-tert-butylbenzoic acid-κO)praseodymium(III)]
Jun Dai,Rong-Kun Pan,Juan Yang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811029667
Abstract: The reaction of praseodymium nitrate and 4-tert-butylbenzoic acid (tBBAH) in aqueous solution yielded the dinuclear title complex, [Pr2(C11H13O2)6(C11H14O2)2(H2O)2], which has non-crystallographic Ci symmetry. The two PrIII ions are linked by two bridging and two bridging–chelating tBBA ligands, with a Pr...Pr separation of 4.0817 (9) . Each PrIII ion is nine-coordinated by one chelating tBBA ion, one monodentate tBBAH ligand and one water molecule in a distorted tricapped trigonal–prismatic environment. The complex molecules are linked into infinite chains along the c axis by intermolecular O—H...O hydrogen bonds.
Research on the Management of Urban Unlicensed Mobile Street Vendors --- Taking Public Satisfied Degree as Value Orientation
Xuxu Chai,Ziqiang Qin,Kun Pan,Xiaoling Deng
Asian Social Science , 2011, DOI: 10.5539/ass.v7n12p163
Abstract: The paper studies on management of urban unlicensed mobile vendors on the street, taking public satisfied degree as value orientation, based on 119 public surveys’ data. The results show that the public hope the government works out appropriate policies to make difficult problems clear in allusion to the effective management of urban unlicensed mobile street vendors. It’s necessary to actively enhance the interaction between unlicensed mobile vendors on the street and urban management and law enforcement officers. Urban management and law enforcement officers should humanize management to unlicensed mobile street vendors. It’s efficient to resolve the contradiction between them by building a unified management area to achieve a satisfied management of unlicensed mobile street vendors for the public.
Vertebral artery dissection associated with viral meningitis
Pan Xudong,Ma Aijun,Wang Kun,Nie Shumin
BMC Neurology , 2012, DOI: 10.1186/1471-2377-12-79
Abstract: Background Vertebral artery dissection (VAD) is often associated with trauma or occurs spontaneously, inevitably causing some neurological deficits. Even though acute infection can be related to the development of spontaneous VAD (sVAD), VAD associated with viral meningitis has never been reported in the literature. Case presentation A 42-year-old man with fever, sore throat, and runny nose developed sudden onset of occipital headache, vertigo, transient confusion, diplopia, and ataxia. Brain stem encephalitis was diagnosed initially because the cerebrospinal fluid (CSF) study showed inflammatory changes. However, subsequent diffusion-weighted (DWI) magnetic resonance imaging of his brain demonstrated left lateral medullary infarction, and the digital subtraction angiography (DSA) confirmed VAD involving left V4 segment of the artery. Consequently, the patient was diagnosed as VAD accompanied by viral meningitis. Conclusion This case suggests that viral meningitis might lead to inflammatory injury of the vertebral arterial wall, even sVAD with multiple neurological symptoms.
Associations and Impact Factors between Living Arrangements and Functional Disability among Older Chinese Adults
Hui Wang, Kun Chen, Yifeng Pan, Fangyuan Jing, He Liu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0053879
Abstract: Objectives To examine the association of living arrangements with functional disability among older persons and explore the mediation of impact factors on the relationship. Design Cross-sectional analysis using data from Healthy Aging study in Zhejiang Province. Participants Analyzed sample was drawn from a representative rural population of older persons in Wuyi County, Zhejiang Province, including 1542 participants aged 60 and over in the second wave of the study. Measurements Living arrangements, background, functional disability, self-rated health, number of diseases, along with contemporaneous circumstances including income, social support (physical assistance and emotional support). Instrument was Activities of Daily Living (ADL) scale, including Basic Activities Daily Living (BADL) and Instrumental Activities of Daily Living (IADL). Results Living arrangements were significantly associated with BADL, IADL and ADL disability. Married persons living with or without children were more advantaged on all three dimensions of functional disability. Unmarried older adults living with children only had the worst functional status, even after controlling for background, social support, income and health status variables (compared with the unmarried living alone, ? for BADL: ?1.262, ? for IADL: ?2.112, ? for ADL: ?3.388; compared with the married living with children only, ? for BADL: ?1.166, ? for IADL: ?2.723, ? for ADL: ?3.902). In addition, older adults without difficulty in receiving emotional support, in excellent health and with advanced age had significantly better BADL, IADL and ADL function. However, a statistically significant association between physical assistance and functional disability was not found. Conclusion Functional disabilities vary by living arrangements with different patterns and other factors. Our results highlight the association of unmarried elders living with children only and functioning decline comparing with other types. Our study implies policy makers should pay closer attention to unmarried elders living with children in community. Community service especially emotional support such as psychological counseling is important social support and should be improved.
Finite-Time Stability Analysis for a Class of Continuous Switched Descriptor Systems
Pan Tinglong,Yang Kun,Shen Yanxia,Gao Zairui,Ji Zhicheng
Mathematical Problems in Engineering , 2014, DOI: 10.1155/2014/979130
Abstract: Finite-time stability has more practical application values than the classical Lyapunov asymptotic stability over a fixed finite-time interval. The problems of finite-time stability and finite-time boundedness for a class of continuous switched descriptor systems are considered in this paper. Based on the average dwell time approach and the multiple Lyapunov functions technique, the concepts of finite-time stability and boundedness are extended to continuous switched descriptor systems. In addition, sufficient conditions for the existence of state feedback controllers in terms of linear matrix inequalities (LMIs) are obtained with arbitrary switching rules, which guarantee that the switched descriptor system is finite-time stable and finite-time bounded, respectively. Finally, two numerical examples are presented to illustrate the reasonableness and effectiveness of the proposed results. 1. Introduction Switched systems are a special class of hybrid systems, which consist of a collection of continuous or discrete-time subsystems together with a switching rule that orchestrates switching between these subsystems to achieve the control objectives [1]. Descriptor systems are also referred to as singular systems, implicit systems, or differential-algebraic systems, which are also a natural representation of dynamic systems and can describe physical systems better than the normal linear systems. Descriptor systems have been widely applied in many practical systems such as networks, power systems, electrical circuits, economics mathematical modeling, and many other fields [2, 3]. In actual control systems, switching phenomenon of descriptor systems is ubiquitous. Nevertheless, because of the switching between multiple descriptor subsystems and the algebraic constraints in descriptor model, it is inevitably difficult to analyze and synthesize for switched descriptor systems. Up to now, much attention has been mainly focused on system stability and reliability [2–5], control [6–8], cost-guaranteed control [9–11], system controllability, and reachability [12, 13] for switched descriptor systems. Generally, most of existing results related to stability and performance criteria of switched descriptor systems are based on the classical Lyapunov asymptotic stability, which is defined as an infinite time interval. However, in many actual systems, such as network control systems, the practical system state does not exceed some bound during some time interval and we need to avoid saturations and the excitation of nonlinear dynamics. In this case, the asymptotic
Nontrivial Solutions for Dirichlet Boundary Value Systems with the -Laplacian
Shang-Kun Wang,Wen-Wu Pan
Journal of Mathematics , 2014, DOI: 10.1155/2014/505290
Abstract: Using critical point theory due to Bonanno (2012), we prove the existence of at least one nontrivial solution for Dirichlet boundary value systems with the -Laplacian. 1. Introduction In this note, we prove the existence of at least one nontrivial solution for Dirichlet boundary value systems with the -Laplacian as follows: for , where is an integer, where denotes the -Laplacian differential operator and for , , is a nonempty bounded open set with smooth boundary , is a function such that is measurable in for all , is in for every and for every , and denotes the partial derivative of with respect to for . Due to importance of second-order Dirichlet and Neumann problems in describing a large class of physic phenomena, many authors have studied the existence and multiplicity of solutions for such a problem; we refer the reader to [1–13] and references therein. Some authors also study the system case; see [14–20]. In [6], the authors, employing a three-critical-point theorem due to Bonanno [3], determined an exact open interval of the parameter for which system (1) in the case admits non nontrivial weak solution. The aim of this paper is to prove the existence of at least one nontrivial weak solution for (1) for appropriate values of the parameter belonging to a precise real interval, which extend the results in [7]. For basic notation and definitions and also for a thorough account on the subject, we refer the reader to [21]. 2. Preliminaries and Basic Notation First, we recall for the reader’s convenience [22, Theorem 2.5] as given in [23, Theorem 2.1] (see also [3, Proposition 2.1]) which is our main tool to transfer the question of existence of at least one weak solution of (1) to the existence of a critical point of the Euler functional as follows. For a given nonempty set and two functionals , we define the following two functions as follows: for all , . Theorem 1 ([3, Theorem 5.1]). Let be a reflexive real Banach space and let be a sequentially weakly lower semicontinuous, coercive, and continuously Gateaux differentiable functional whose Gateaux derivative admits a continuous inverse on and let be a continuously Gateaux differentiable functional whose Gateaux derivative is compact. Put and assume that there are , , such that Then, for each , there is such that and . Let us introduce notation that will be used later. Let be the Sobolev space with the usual norm given by , where . Let with the norm where . Let Since for , one has . In addition, it is known [24, formula (6b)] that for , where denotes the Gamma function and is the Lebesgue measure of
Study on the Expression of Organic Anion Transporting Polypeptide (oatp2a1) in Rat with Spleen Deficiency Syndrome and the Exploration of Clinical Significance  [PDF]
Ai-Zhen Pan, Yao-Kun Hao, You-Wu Lin, Ze-Xiong Chen, Shi-Jun Zhang, Xiao Dong, Bin Hu
Chinese Medicine (CM) , 2011, DOI: 10.4236/cm.2011.23018
Abstract: Objective: to explore the mechanism of transportation and transformation of dampness by the way of the expression of organic anion transporting polypeptide (oatp) superfamily member 2a1 (oatp2a1) mRNA in rat with spleen deficiency syndrome and the significance in transportation and transformation of dampness. Methods: 32 wistar male rats were divided randomly into four groups: normal group (n = 6), normal + AA group (n = 6), spleen deficiency group (n = 10), Spleen deficiency + AA group (n = 10). After reserpine-induced spleen deficiency model was made, intragastric administration of aristolochic acid (AA) was adopted for three days, the expression of oatp2a1 mRNA were detected in the tissues of lung, liver, kidney, stomach, small intestine and large intestine in four groups by using Fluorescent Quantitative-Polymerase Chain Reaction (FQ-PCR). Results: the expression of oatp2a1 mRNA in above six tissues could be detected. The ex-pression of oatp2a1 mRNA in liver tissue of rat with spleen deficiency syndrome was up-regulated compared to normal group (P = 0.035, P < 0.05), the expression of oatp2a1 mRNA in small intestinal tissue of rat with spleen deficiency syndrome was down-regulated compared to normal group (P = 0.004, P < 0.01), the expression of oatp2a1 in intestinal tissue in normal + AA group is down-regulated compared to normal group (P = 0.032, P < 0.05). Conclusions: oatp2a1 might be one of the material basis involved in transportation and transformation of dampness. The changes of expression of oatp2a1 mRNA in small intestine, liver tissue suggests that small intestine, liver might play an important role in the transportation and transformation of dampness in the state of spleen deficiency. We further concluded that the function of spleen’s governing transportation and transformation of dampness was not only including the function of the gastrointestinal, but also part of the liver function in some degree, which needs to be further studied.
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