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Search Results: 1 - 10 of 44359 matches for " Yanyan Wu "
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The Effect of Ambivalence Online Review on Consumer Purchasing Intention  [PDF]
Yanyan Wu, Ding Pan
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.86055
Abstract: Online review has been playing an important role in consumer decision making and enterprise marketing recently. This study focuses on two important issues. Firstly, how the ambivalence online review change consumer decision-making and purchase intension from the point view of different types of ambivalence online review. Secondly, how consumer of different involvement degree interprets the ambivalence online review of consumer decision. Finally, the following conclusions are obtained through the empirical study: 1) When the review about product functional attribute is positive, inter-attribute ambivalence is more significant for consumer’s purchasing intension, compared with intra-attribute ambivalence. When the review about product hedonic attribute is positive, intra-attribute ambivalence is more significant to consumer’s purchasing intension, compared with inter-attribute ambivalence. 2) The degree of consumer involvement has a moderating effect on the relationship between product attributes and type of ambivalence and consumer purchasing intention. When the review about product functional attribute is positive, inter-attribute ambivalence is more significant to consumer’s purchasing intension, compared with intra-attribute ambivalence of high level of consumer involvement. In contrast, intra-attribute ambivalence is more significant to consumer’s purchasing intension, compared with inter-attribute ambivalence for high level of consumer involvement. When the review about product enjoyment attribute is positive, intra-attribute ambivalence is more significant in consumer’s purchasing intension, compared with inter-attribute ambivalence of high low of consumer involvement, thus there are no different between intra-attribute ambivalence and inter-attribute ambivalence for low level of consumer involvement.
The Effect of Inconsistent Product Attribute Reviews on Consumers’ Purchase Intention  [PDF]
Ding Pan, Ya Xu, Yanyan Wu
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.813139
Abstract: This paper studies how the inconsistent product attributes reviews affect the consumer purchase intention, and discusses the mediating role of information processing fluency and the moderating role of the relationship norm and the ambiguity tolerance. In this study, 3 experiments were conducted to examine the significant effect of inconsistent product attribute reviews on the purchase intention, and the mediating effect of information processing fluency. The relationship between the relationship norm and ambiguity tolerance was also examined. The experimental results validate the research hypothesis, and the research also discusses the theoretical contribution, the management inspiration and the future research direction.
Pathways of Complement Activation Following Intestinal Ischemia-Reperfusion in Macaque
Lantao Xu, Yanyan Wu
Journal of Medical Biochemistry , 2012, DOI: 10.2478/v10011-012-0004-3
Abstract: Complement activation is a key component in the inflammation cascade. In the present study, intestinal ischemia-reperfusion (IIR) was introduced to macaques, and the pathways of complement activation in the multiple organ dysfunction syndrome (MODS) following IIR were investigated, which may provide evidence on the mechanisms underlying the endogenous protection in systemic inflammatory response. IIR was performed by clamping superior mesenteric artery and releasing clamp in 5 macaques. Immunization rate nephelometry and CH50 total complement detection were employed to measure the serum concentration of C3, C4, C-reactive protein (CRP) and total complements. Immunocytochemistry was carried out to detect the contents of IL-1 and NF-κB in polymorphonuclear cells (PMN). Flow cytometry was done to measure the apoptosis rate of PMN. At 24 h after IIR, the amount of total complement (106.6±18.07 U/mL) was reduced to 62.1±9.52 U/mL (p<0.05). In addition, the C3 was reduced by 30% (p<0.05) but C4 remained unchanged after IIR (0.1342±0.07 vs 0.1420±0.06, P>0.05). The apoptosis rate (15.4%±1.14%) of PMN was markedly reduced (3.5%±0.53%) following IIR (p<0.05) accompanied by increased contents of IL-1 and NF-κB. Moreover, CRP was also significantly elevated after IIR (4.33±1.13 mg/L vs 17.73±0.86 mg/L; p<0.01). Following IIR, complements are activated through the alternative pathway. Complement activation fragments can inhibit the apoptosis of PMN and elevate the expressions of acute phase inflammatory proteins including CRP and IL-1, which promotes the inflammation cascade and facilitates the occurrence of MODS.
4-(5-Hydroxymethyl-2-methoxyphenoxy)benzoic acid
Yanyan Niu,Bo Wu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811012190
Abstract: The title compound, C15H14O5, crystallizes with two independent molecules in the asymmetric unit in which the benzene rings are inclined at dihedral angles of 79.4 (1) and 84.2 (1)°. In the crystal, intermolecular O—H...O hydrogen bonds link the molecules into double chains propagating in [001].
Asymptotic Inference for the Weak Stationary Double AR(1) Model  [PDF]
Fang Chang, Augustine C. M. Wong, Yanyan Wu
Open Journal of Statistics (OJS) , 2012, DOI: 10.4236/ojs.2012.22016
Abstract: An AR(1) model with ARCH(1) error structure is known as the first-order double autoregressive (DAR(1)) model. In this paper, a conditional likelihood based method is proposed to obtain inference for the two scalar parameters of interest of the DAR(1) model. Theoretically, the proposed method has rate of convergence O(n-3/2). Applying the proposed method to a real-life data set shows that the results obtained by the proposed method can be quite different from the results obtained by the existing methods. Results from Monte Carlo simulation studies illustrate the supreme accuracy of the proposed method even when the sample size is small.
Evaluation of Third-Order Method for the Tests of Variance Component in Linear Mixed Models  [PDF]
Yanyan Wu, Augustine Wong, Georges Monette, Laurent Briollais
Open Journal of Statistics (OJS) , 2015, DOI: 10.4236/ojs.2015.54025
Abstract: Mixed models provide a wide range of applications including hierarchical modeling and longitudinal studies. The tests of variance component in mixed models have long been a methodological challenge because of its boundary conditions. It is well documented in literature that the traditional first-order methods: likelihood ratio statistic, Wald statistic and score statistic, provide an excessively conservative approximation to the null distribution. However, the magnitude of the conservativeness has not been thoroughly explored. In this paper, we propose a likelihood-based third-order method to the mixed models for testing the null hypothesis of zero and non-zero variance component. The proposed method dramatically improved the accuracy of the tests. Extensive simulations were carried out to demonstrate the accuracy of the proposed method in comparison with the standard first-order methods. The results show the conservativeness of the first order methods and the accuracy of the proposed method in approximating the p-values and confidence intervals even when the sample size is small.
Risk factors for myopia in Inner Mongolia medical students in China  [PDF]
Yanyan Wu, He Yi, Wenzhong Liu, Haiying Jia, Yuki Eshita, Shubi Wang, Peng Qin, Juan Sun
Open Journal of Epidemiology (OJEpi) , 2012, DOI: 10.4236/ojepi.2012.24013
Abstract: Objective: The aim of the study was to investigate myopia and related factors in Inner Mongolia Medical Students, China. Methods: The survey employed a self-administered questionnaire. All medical students from the Inner Mongolia Medical University campus and those living and learning on campus were eligible. The questionnaire consisted of three sections: students’ basic information, attitude on myopia behavior, and myopia status of students. 6047 medical students completed the questionnaire. Results: A total of 6040 (90.5%) students aged 16 to 28 years (mean 21 ± 1.5 years) completed the questionnaire, of which 1772 (29.3%) were male and 4268 (70.6%) were female. The Mongolia of medical students had the lowest rate (64.3%) of myopia. The prevalence of myopia in Han nationality was highest (72.8%). Myopia occurred more frequently among students living in the city than in the rural. 76.4% urban and 66.6% rural students had myopia (p < 0.001). For myopia students it was established that 85.5% had begun to wear spectacles in middle school. Conclusion: A high myopia prevalence was demonstrated among medical students in the Inner Mongolia area of China. Our study’s findings could help health care professionals develop targeted myopia control policies for the population of students in Inner Mongolia of China and ensure the policies are more rational, useful, and effective.
The impact of academic stress on medical students attending college in the Inner Mongolia Area of China  [PDF]
Jie Chen, Yanyan Wu, He Yi, Zhijun Li, Yuki Eshita, Peng Qin, Lifu Chen, Juan Sun
Open Journal of Preventive Medicine (OJPM) , 2013, DOI: 10.4236/ojpm.2013.32019

The aim of this study was to examine whether student characteristics affect the risk of health conditions, and explore whether the degree of academic stress affects the level of distress. We surveyed medical students in the Inner Mongolia Medical College China using a questionnaire. A logistic regression analysis was used to ascertain factors associated with distress. The Wilcoxon Mann-Whitney test was used to determine the relationship between distress and different academic stress levels. Of the 6044 students completing questionnaires, 47.5% self-reported distressing body symptoms induced by academic stress. Chi square tests showed statistically significant associations between distress and gender, academic stress, and residence; feeling academic stress caused a more than 1.5 times risk of distress. Gender and academic stress were significantly associated with distress in non-conditional binary logistic regression models. Compared with male students, female students was more likely to feel distress. The Wilcoxon Mann-Whitney test also showed that the distress rate increased with academic stress and a dose-response relationship between the distress rate and stress level was found. The present study indicates that it is important to reduce academic stress and manage it in order that better outcomes be achieved in regard to distress, especially in females.

Positivity and boundedness preserving schemes for the fractional reaction-diffusion equation
Yanyan Yu,Weihua Deng,Yujiang Wu
Mathematics , 2013, DOI: 10.1007/s11425-013-4625-x
Abstract: In this paper, we design a semi-implicit scheme for the scalar time fractional reaction-diffusion equation. We theoretically prove that the numerical scheme is stable without the restriction on the ratio of the time and space stepsizes, and numerically show that the convergent orders are 1 %$2-\alpha$ in time and 2 in space. As a concrete model, the subdiffusive predator-prey system is discussed in detail. First, we prove that the analytical solution of the system is positive and bounded. Then we use the provided numerical scheme to solve the subdiffusive predator-prey system, and theoretically prove and numerically verify that the numerical scheme preserves the positivity and boundedness.
Positivity and Boundedness Preserving Schemes for Space-Time Fractional Predator-Prey Reaction-Diffusion Model
Yanyan Yu,Weihua Deng,Yujiang Wu
Mathematics , 2013, DOI: 10.1016/j.camwa.2015.02.024
Abstract: The semi-implicit schemes for the nonlinear predator-prey reaction-diffusion model with the space-time fractional derivatives are discussed, where the space fractional derivative is discretized by the fractional centered difference and WSGD scheme. The stability and convergence of the semi-implicit schemes are analyzed in the $L_\infty$ norm. We theoretically prove that the numerical schemes are stable and convergent without the restriction on the ratio of space and time stepsizes and numerically further confirm that the schemes have first order convergence in time and second order convergence in space. Then we discuss the positivity and boundedness properties of the analytical solutions of the discussed model, and show that the numerical solutions preserve the positivity and boundedness. The numerical example is also presented.
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