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A PRICE-SETTING NEWSVENDOR MODEL UNDER CVAR DECISION CRITERION WITH EMERGENCY PROCUREMENT

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Journal of Systems Science and Systems Engineering 2010年第1期19卷 85-104页

作者： Minghui XU School of economics and Management,Wuhan university,Wuhan 43007{2.{{2. School of economics and Management Wuhan University Wuhan China

In this paper, we consider a newsvendor model in which a risk-averse manager faces a stochastic price-dependent demand in either an additive or a multiplicative form. An emergency purchase option is allowed after the realization of demand to satisfy the units that are short. By adopting Conditional value-at-risk （CVaR） as the decision criterion, we aim to investigate the optimal pricing and ordering decisions, and the effects of parameter changes in such a setting. We provide sufficient conditions for the uniqueness of the optimal policy for both demand models. We perforl~, comparative statics analysis to show how the optimal pricing and ordering decision behaves when changing parameters. We also compare our results with those of the newsvendor with a general utility function and with CVaR criterion under lost sales assumption. Our key results include：（i） For both demand models, the optimal selling price is decreasing in risk aversion. Hence, the optimal price of a risk-averse newsvendor is not greater than the optimal price of a risk-neutral newsvendor. （it） In contrary to the lost sales case, for the multiplicative demand model, the optimal order quantity may not be monotonic in risk aversion. Consequently, the optimal risk-averse order quantity may be lower or higher than the optimal risk- neutral counterpart. （iii） For the additive model, the optimal order quantity is strictly increasing in the emergency purchase price, while for the multiplicative model the optimal order quantity has no such a monotonic property. Some numerical examples are conducted to verify our claims and gain more insights about the risk-averse decision-making behaviors.

关键词： Newsvendor model inventory pricing risk aversion conditional value-at-risk

Sound radiation of a functionally graded material cylindrical shell in water by mobility method

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Theoretical & Applied Mechanics Letters 2011年第6期1卷 69-74页

作者： Buqing Xu,1,2. ) Shaopu Yang,3, and Haoyu Li1, 1)Department of Engineering Mechanics, shijiazhuang Tiedao {2., shijiazhuang 050043, china 2.Provincial Laboratory of Traffic Safety and Control of Hebei, shijiazhuang Tiedao {2., shijiazhuang 050043, china 3)shijiazhuang Tiedao {2., shijiazhuang 050043, china shijiazhuang Tiedao university Shijiazhuang 050043 China

Based on the fundamental dynamic equations of functionally graded material (FGM) cylindrical shell, this paper investigates the sound radiation of vibrational FGM shell in water by mobility method. This model takes into account the exterior fluid loading due to the sound press radiated by the FGM shell. The FGM cylindrical shell was excited by a harmonic line radial force uniformly distributing along the generator. The FGM shell equations of motion, the Helmholtz equation in the exterior fluid medium and the continuity equation at fluid-shell interface are used in this vibroacoustic problem. The expressions of sound radiation efficiency and sound field of the FGM shell have been derived by mobility method. Radiation efficiency, modal mobility and the directivity pattern of the sound field are solved numerically. In particular, radiation efficiency and directivity pattern with various power law index are analyzed.

关键词： fluid-loaded cylindrical shell functionally graded material mobility method sound radiation

Effects of morphine dependence and withdrawal on levels of neurosteroids in rat brain

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Acta Pharmacologica Sinica 2004年第10期 45-51页

作者： Cai-zhen YAN, Yan-ning HOU Bathune International Peace Hospital, Hebei Medical university,shijiazhuang 05008{2.{{2.

AIM: To investigate the effects of morphine dependence and withdrawal on the concentrations of neurosteroids in rat brain. METHODS: A method of simultaneous quantification of neurosteroids by gas chromatography-mass spectrometry (GC-MS) had been established. RESULTS: The chronic morphine administration (ip) resulted in a marked decrease in the brain concentrations of pregnenolone (PREG), progesterone (PROG), and pregenenolone sulfate (PREGS) in rats killed 6 h after the last treatment. In contrast, there were no significant effects of morphine dependence on the brain concentrations of allopregnanolone (AP), dihydroepiandrosterone (DHEA), and dihydroepiandrosterone sulfate (DHEAS). Naloxone-induced withdrawal produced a significant increase in the concentrations of PREG, PROG, AP, DHEA, PREGS, and DHEAS as compared with the control group. CONCLUSION: Morphine dependence and withdrawal affected the concentrations of neurosteroids in rat brain, which suggests that endogenous neurosteroids in brain might be

关键词： morphine dependence withdrawal steroids mass fragmentography

Synthesis and Characterization of Mg_3(PO_4)_2.coated Li_(1.05)Ni_(1/3)Mn_(1/3)Co_(1/3)O_2.Cathode Material for Li-ion Battery

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Journal of Wuhan university of Technology(Materials Science) 2009年第3期24卷 347-353页

作者：陈玉红 Department of Chemical and Environmental Engineering Hebei Chemical & Pharmaceutical Vocational Technology Colege

Mg3（PO4）2.coated Li1.05Ni1/3Mn1/33Co1/3O2.cathode materials were synthesized via co-precipitation method. The morphology, structure, electrochemical performance and thermal stability were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, cyclic voltammetry（CV）, electrochemical impedance spectroscopy（EIS）, charge/discharge cycling and differential scanning calorimeter （DSC）. SEM analysis shows that Mg3（PO4）2.coating changes the morphologies of their particles and increases the grains size. XRD and CV results show that Mg3（PO4）2.coating powder is homogeneous and has better layered structure than the bare one. Mg3（PO4）2.coating improved high rate discharge capacity and cycle-life performance. The reason why the cycling performance of Mg3（PO4）2.coated sample at 55 ℃ was better than that of room temperature was the increasing of lithium-ion diffusion rate and charge transfer rate with temperature rising. Mg3（PO4）2.coating improved the cathode thermal stability, and the result was consistent with thermal abuse tests using Li-ion cells： the Mg3（PO4）2.coated Li1.05Ni1/3Mn1/3Co1/3O2.cathode did not exhibit thermal runaway with smoke and explosion, in contrast to the cells containing the bare Li1.05Ni1/3Mn1/3Co1/3O2.

关键词： lithium-ion batteries cathode materials Li1.05Ni1/3Mn1/3Co1/3O2 co-precipitation

CATALYTIC BEHAVIOR OF HYDROTALCITE-LIKE COMPOUND IN NITROGEN MONOXIDE REDUCTION BY CO

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Chinese Journal of Catalysis 1997年第6期 6-7页

作者： Wang Xuezhong1, Liu Yumin2. Wu Yue1*(1 Changchun Institute of Applied Chemistry, The Chinese Academy of Sciences, Changchun 13002. 2.Hebei Science and Technology university, shijiazhuang 050019)

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关键词： Nitrogen monoxide Carbon monoxide Reduction Hydrotalcitelike compound

DENSITY OF INTEGERS THAT ARE THE SUM OF FOUR CUBES OF PRIMES

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Chinese Annals of Mathematics,Series B 2001年第2期22卷 233-242页

作者： REN XIUMIN School of economics, Shandong university, Jinan {2.0100,{{2.. School of economics Shandong University Jinan 250100 China

Using the circle method and sieves, the author proves that a positive proportion of positive integers can be represented as the sum of four cubes of primes.

关键词： Waring-Goldbach problem Hardy-Littlewood method Sieve methods

Iron metabolism in the mononuclear phagocyte system

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Progress in Natural Science:Materials International 2008年第10期18卷 1197-1202页

作者： Weina Kong Xianglin Duan Zhenhua Shi Yanzhong Chang The Key Laboratory of Animal Physiology,Biochemistry and Molecular Biology of Hebei Province,Hebei Normal university,shijiazhuang 050016,{{2. The Key Laboratory of Animal Physiology Biochemistry and Molecular Biology of Hebei Province Hebei Normal University Shijiazhuang 050016 China

The maintenance of body iron homeostasis requires the coordination of multiple regulatory mechanisms of iron *** mononuclear phagocyte system (MPS,composed of monocytes,macrophages,and their precursor cells) is crucial in the maintenance of iron *** of iron is carried out by specialized macrophages via engulfment of aged *** iron stores of macrophages depend on the levels of recovered and exported ***,the molecular mechanisms underlying iron homeostasis in macrophages are poorly *** studies characterizing the function and regulation of natural resistance-associated mac- rophage protein I (Nrampl),divalent metal transporter 1 (DMTI),HLA-linked hemechromatosis gene (HFE),ferroportin 1 (FPNI), and hepcidin are rapidly expanding our knowledge on the molecular level of MPS iron *** studies are deepening our under- standing about the molecular mechanism of iron homeostasis and iron-related diseases.

关键词： Mononuclear phagocyte system CD 163 Natural resistance-associated macrophage protein 1 Divalent metal transporter 1 HFE Ferroportin 1 Hepcidin

Group sparse representation for image categorization and semantic video retrieval

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Science china(Information Sciences) 2011年第10期54卷 2051-2063页

作者： LIU YaNan 1,2.,WU Fei 2.& ZHUANG YueTing 2.1 School of Information,Zhejiang university of Finance & economics,Hangzhou,310018,{2. 2.College of Computer Science and Technology,Zhejiang university,Hangzhou,310012.{2. 1. School of Information Zhejiang University of Finance & Economics Hangzhou 310018 China2. College of Computer Science and Technology Zhejiang University Hangzhou 310012 China

Multimedia content analysis and management are a promising and challenging *** this paper we develop a novel approach to image representation,which we call group sparse representation (GSR),for image classification and video *** basic idea is to represent a test image as a weighted combination of all the training *** particular,we introduce two sets of weight coefficients,one for each training image and the other for each ***,we formulate our concern as a group nonnegative garrote *** resulting representations are sparse,and they are appropriate for discriminant *** on Caltech101 and PASCAL VOC2.08 image dataset and TRECVID2.05 video corpus testify that our proposed approach is efficient and effective.

关键词： compressive sensing group sparse representation bag-of-SIFT-words nonnegative garrote l1-minimization apcluster

FUNCTIONAL MODULUS OF CONTINUITY FOR BROWNIAN MOTION IN HLDER NORM

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Chinese Annals of Mathematics,Series B 2001年第2期22卷 223-232页

作者： WEI QICAI School of economics, Zhejiang university, Hangzhou 3100{2.,{{2.. School of economics Zhejiang University Hangzhou 310028 China

The author establishes a large deviation for k-dimensional Brownian motion B in stronger topology, by which the functional modulus of continuity for B in Holder norm can be obtained.

关键词： Large deviations Functional modulus of continuity k-dimensional Brownian motion Holder norm