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A New Cooperative Distributed MPC Method Based on Reduction and Classification

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Chinese Journal of Electronics 2017年第3期26卷 564-572页

作者： wu lan WANG Lei College of Electrical Engineering Henan University of Technology Department of Electrical Engineering Hangzhou First Technician College

To decrease the overlarge calculation induced by the centralized processing,a new cooperative distributed Model predictive control(MPC)method is proposed for large-scale systems with coupled *** and classification are investigated by defining the influence degree to reduce the whole system and then to classify the reduced system into several subsystem *** groups are mutually decoupled,while there is relativity between these subsystems comprised in the same ***/cooperative and distributed MPC algorithms for each group are implemented to ensure the feasibility and the stability of the whole ***,for practical applications,the finite times interactive control strategy between different groups is adopted to compensate information loss brought by the reduced subsystem and realize the global cooperative distributed *** algorithm significantly decreases the computational load,has better control *** are given to illustrate the effectiveness of these developed algorithms.

关键词： Large-scale complex system Reduction and classification Influence degree Cooperative distributed Model predictive control(MPC)

A Characterization of Some Weighted Inequalities for the Vector-valued Weighted Maximal Function

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Acta Mathematica Sinica,English Series 2010年第11期26卷 2191-2198页

作者： Cui lan wu School of Mathematical Science Xuzhou Normal University Xuzhou 221116 P. R. China

We give in this paper a necessary and sufficient condition of weighted weak and strong type norm inequalities for the vector-valued weighted maximal function.

关键词： Ap(ω) family vector-valued weighted maximal function weighted inequalities HSlder'sinequality

VaR Criteria for optimal limited changeloss and truncated change-loss reinsurance

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Frontiers of Mathematics in China 2013年第3期8卷 583-608页

作者： Xiaojing MA lan wu Department of Financial Mathematics School of Mathematical Sciences Peking University Beijing 100871 China Center for Statistical Science Peking University Beijing 100871 China

Reinsurance can provide an effective way for insurer to manage its risk exposure. In this paper, we further analyze the optimal reinsurance models recently proposed by J. Cai and K. S. Tan [Astin Bulletin, 2007, 37（1）： 93- 112]. With the criteria of minimizing the value-at-risk （VaR） risk measure of insurer＇s total loss exposure, we derive the optimal values of sharing proportion a, retention d, and layer 1 of two reinsurance treaties： the limited change- loss f（x） = a{（x - d）＋ - （x -l）＋} and the truncated change-loss f（x） = a（x - d）＋I（x≤t）. Both of the reinsurance plans have been considered to be more realistic and practical in the real business. Our solutions have several appealing features：（i） there is only one condition to verify for the existence of optimal limited change-loss reinsurance while there always exists an optimal truncated change-loss reinsurance, （ii） the resulting optimal parameters have simple analytic forms which depend only on assumed loss distribution, reinsurer＇s safety loading, and insurer＇s risk tolerance, （iii） the optimal retention d for limited change-loss reinsurance is the same as that by Cai and Tan while the optimal value is smaller for truncated change-loss, （iv） the optimal sharing proportion and layer are always the same for both reinsurance plans, （v） minimized VaR are strictly lower than the values derived by Cai and Tan, （vi） the optimization results reveal possible drawbacks of VaR-based risk management that a heavy tail risk exposure may be expressed by lower VaR.

关键词： Limited change-loss truncated change-loss value-at-risk (VaR) optimal reinsurance

Biodegradation of oil wastewater by free and immobilized Yarrowia lipolytica W29

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Journal of Environmental Sciences 2009年第2期21卷 237-242页

作者： wu lan GE Gang WAN Jinbao College of Life Science Nanchang University Nanchang 330031 China College of Environmental Science and Engineering Nanchang University Nanchang 330031 China

The ability of Yarrowia lipolytica W29 immobilized by calcium alginate to degrade oil and chemical oxygen demand （COD） was examined. The degradation rules of oil and COD by immobilized cells with the cell density of 6.65 × 10^6 CFU/mL degraded 2000 mg/L oil and 2000 mg/L COD within 50 h at 30℃ （pH 7.0, 150 r/min）, similarly to those of free cells, and the degradation efficiencies of oil and COD by immobilized cells were above 80%, respectively. The factors affecting oil and COD degradation by immobilized cells were investigated, the results showed that immobilized cells had high thermostability compared to that of free cells, and substrate concentration significantly affected degrading ability of immobilized cells. Storage stability and reusability tests revealed that the oil degradation ability of immobilized cells was stable after storing at 4~C for 30 d and reuse for 12 times, respectively, the COD degradation rate of immobilized cells was also maintained 82% at the sixth cycle. These results suggested that immobilized Y lipolytica might be applicable to a wastewater treatment system for the removal of oil and COD.

关键词： Yarrowia lipolytica biodegradation oil wastewater calcium alginate

Poisoning the pika： must protection of grasslands be at the expense of biodiversity？

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Science China(Life Sciences) 2017年第5期60卷 545-547页

作者： lan wu Hao Wang Center for Nature and Society School of Life Sciences Peking University Beijing 100871 China

The plateau pika（Ochotona curzoniae）plays a keystone role in the grassland ecosystem on the Qinghai-Tibetan Plateau（QTP）（Smith and Foggin,1999;Lai and Smith,2003）,but in spite of its ecological importance it has... 详细信息

关键词：国家级自然保护区高原鼠兔生物多样性中毒草地生态系统草原青藏高原噪声比

Proper Biharmonic Submanifolds in a Sphere

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Acta Mathematica Sinica,English Series 2012年第1期28卷 205-218页

作者： Xian Feng WANG lan wu School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071P.R.China Department of Mathematics Renmin University of ChinaBeijing 100872P.R.China

In this paper, we obtain a constraint of the mean curvature for proper biharmonic submanifolds in a sphere. We give some characterizations of some proper biharmonic submanifolds with parallel mean curvature vector in ... 详细信息

关键词： Proper biharmonic map parallel mean curvature vector mean curvature

Effect of chlorogenic acid on antioxidant activity of Flos Lonicerae extracts

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第9期8卷 673-679页

作者： wu lan Department of Horticulture Beijing Vocational College of Agriculture Beijing 102442 China

Flos Lonicerae is a medically useful traditional Chinese medicine herb. However, little is known about the antioxidant properties of Flos Lonicerae extracts. Here the antioxidant capacity of water, methanolic and ethanolic extracts prepared from Flos Lonicerae to scavenge 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and reduce Fe3+ to Fe2+ is examined. Chlorogenic acid, a major component of Flos Lonicerae, is identified and further purified from 70% ethanolic extract with high performance liquid chromatography (HPLC) and its antioxidant capacity is characterized. The total phenolic compounds and chlorogenic acid con-tents in Flos Lonicerae are determined. The present results demonstrate that the Flos Lonicerae extracts exhibit antioxidant ac-tivity and chlorogenic acid is a major contributor to this activity.

关键词： Flos Lonicerae Chlorogenic acid Antioxidant

Convergence and optimality of BS-type discrete hedging strategy under stochastic interest rate

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Science China Mathematics 2011年第7期54卷 1457-1478页

作者： HE JiFeng wu lan Department of Mathematics Peking University Beijing 100871 China

We focus on the asymptotic convergence behavior of the hedging errors of European stock option due to discrete hedging under stochastic interest rates. There are two kinds of BS-type discrete hedging differ in hedging instruments: one is the portfolio of underlying stock, zero coupon bond, and the money market account (Strategy BSI); the other is the underlying stock, zero coupon bond (Strategy BSII). Similar to the results of the deterministic interest rate case, we show that convergence speed of the discounted hedging errors is 1/2-order of trading frequency for both strategies. Then, we prove each of the BS-type strategy is not only locally optimal, but also globally optimal under the corresponding measure. Finally, we give some numerical examples to illustrate the results. All the discussion is based on non-arbitrage condition and zero transaction cost.

关键词： discrete time hedging delta hedging stochastic interest rate

Historical Reconstruction - Reread Kenzaburo Oe＇ s Banengannen＇ s Soccer Team

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学术界 2013年第12期 261-265页

作者： wu lan Shanghai International Studies University Shanghai 200083

The novel Banengannen’s Soccer Team published in 1967has been classified as historical"meta narration"of Kenzaburo *** the novel,there are two main characters—Mitsusaburo and Takashi,both of whom represent two ways of exploring the historical *** the process of exploration of the two characters,Kenzaburo Oe symbolically analyzed the value presetting of the Japanese people—getting one’s own value through projecting the"Emperor",recreating a new chapter of history from personal experience.

关键词：足球队历史大江重构日本人象征性小说价值