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Search Results: 1 - 10 of 11681 matches for " Yuping Cao "
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Existence and Stability Analysis of Fractional Order BAM Neural Networks with a Time Delay  [PDF]
Yuping Cao, Chuanzhi Bai
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.612181
Abstract: Based on the theory of fractional calculus, the contraction mapping principle, Krasnoselskii fixed point theorem and the inequality technique, a class of Caputo fractional-order BAM neural networks with delays in the leakage terms is investigated in this paper. Some new sufficient conditions are established to guarantee the existence and uniqueness of the nontrivial solution. Moreover, uniform stability of such networks is proposed in fixed time intervals. Finally, an illustrative example is also given to demonstrate the effectiveness of the obtained results.
Empirical Study of Influential Factors of Online Customers’ Repurchase Intention  [PDF]
Yuping Li
iBusiness (IB) , 2016, DOI: 10.4236/ib.2016.83006
Abstract: There is not a unanimous conclusion about the influential elements of online customers’ repurchase intention. We established a concept model and discussed how utilitarian values (perceived ease of use and perceived usefulness), social values (satisfaction and trust) and the hedonic value (perceived enjoyment) directly and indirectly influenced customers’ repurchase intention in the context of online shopping. It adapted questionnaire to collect data and testified the hypothesis by structural equation model. The results showed that perceived usefulness, online customers’ satisfaction and perceived enjoyment had significantly positive impact on online customers’ repurchase intention. Moreover, we found that compared with utilitarian factors, the hedonic factor had a stronger positive impact on repurchase intention.
An Empirical Analysis of the Impact of RMB Exchange Rate Fluctuation on Textile and Clothing Export of Guangdong  [PDF]
Yuping Su
Chinese Studies (ChnStd) , 2017, DOI: 10.4236/chnstd.2017.62007
Abstract: The main purpose of this paper is to analyze if RMB appreciation is the reason for the decline of Guangdong textile and garment exports and how to make textile and garment industry of Guangdong province break through the bottleneck of development, so as to achieve a qualitative leap in the context of the RMB exchange rate fluctuations and rising production costs. Five parts are included, the first part is introduction, which elaborates the research significance and literature review; the second part is about data and research methods; the third part is an empirical analysis of the impact of RMB exchange rate fluctuation on textile and clothing export of Guangdong; the fourth part is the conclusion analysis, while the last part are policy suggestion, which includes three aspects, government industry and enterprise themselves. In theory, the appreciation of the exchange rate will reduce the export price advantage to reduce exports. However, in this paper, the VAR and VEC models were constructed by using the monthly data of Guangdong textile and clothing export (LNEX), RMB real exchange rate (LNER) and purchasing price index (LNPPI) in 2007-2014, finding that Although LNEX has a co-integration relationship with LNER in the long run, LNER is not the Granger Cause of LNEX, while LNPPI passes the test of causality; Impulse response curves show that LNER has a negative impact on LNEX in the short term, while there is no shock effect for a long time; Variance decomposition analysis shows that contribution of LNER to LNEX was 0, both in the long term and short term, while the long-term contribution of LNPPI to LNEX is about 8%.
Doped Colloidal ZnO Nanocrystals
Yizheng Jin,Yuping Ren,MoTao Cao,Zhizhen Ye
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/985326
Abstract: Colloidal ZnO nanocrystals are promising for a wide range of applications due to the combination of unique multifunctional nature and remarkable solution processability. Doping is an effective approach of enhancing the properties of colloidal ZnO nanocrystals in well-controlled manners. In this paper, we analyzed two synthetic strategies for the doped colloidal ZnO nanocrystals, emphasizing our understanding on the critical factors associated with the high temperature and nonaqueous approach. Latest advances of three topics, bandgap engineering, n-type doping, and dilute magnetic semiconductors related to doped ZnO nanocrystals were discussed to reveal the effects of dopants on the properties of the nanocrystalline materials.
Application of triple potential step amperometry method for quantitative electroanalysis
ChenMing Liu,HongBin Cao,YuPing Li,Yi Zhang
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0379-6
Abstract: A novel quantitative electroanalysis method, triple potential step amperometry (TPSA), was developed and explained with an example of nitrobenzene analyzing in water. The selectivity of TPSA was improved by controlling the potential step within a narrow interval and using enzyme-modified electrode, the narrow potential step makes the method avoid most interferents, and enzyme-modified electrode can enhance the response of target substance selectively. The peak area was investigated for quantitative calibration, such as nitrobenzene concentration showing a linear relation with the peak area, with the correlation coefficients being 0.9995. The t-test and F-test were applied to evaluating the reliability of TPSA, the results showed that there was no evidence of systematic error for TPSA, and the method was of no significant difference from CV. The merit of fast detecting and few potential changing times make the TPSA suitably applicable to low-cost automatic monitoring equipments.
Effects of sulfide on sulfate reducing bacteria in response to Cu(II), Hg(II) and Cr(VI) toxicity
YuXing Sheng,HongBin Cao,YuPing Li,Yi Zhang
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4397-z
Abstract: Sulfate reducing bacteria (SRB) is identified as the primary organisms responsible for the treatment of heavy metal wastewater. However, most heavy metals can inhibit the growth of SRB during heavy metal treatment processes. Sulfide is a metabolic product of SRB and it can precipitate or reduce heavy metals. This study focused on the effects of sulfide on SRB resistance to Cu(II), Hg(I) and Cr(VI) toxicity. First, we considered the existence style of various heavy metals with and without sulfide addition by sequential extraction experiments. Second, the particle size distribution was evaluated and the cell structure during the metabolism of a SRB culture, containing different heavy metals, was analyzed by particle size distribution and TEM analyses. Third, the evolution of sulfate under the influence of different concentrations of heavy metals with and without sulfide addition was investigated to evaluate SRB activity. The results indicated that sulfide played an important role in alleviating and even eliminating the toxicity of Cu(II), Hg(II) and Cr(VI). We also discuss the mechanism of sulfide on SRB resistance to Cu(II), Hg(I) and Cr(VI) toxicity.
An Evolutionary Algorithm Based on a New Decomposition Scheme for Nonlinear Bilevel Programming Problems  [PDF]
Hecheng LI, Yuping WANG
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.31013
Abstract: In this paper, we focus on a class of nonlinear bilevel programming problems where the follower’s objective is a function of the linear expression of all variables, and the follower’s constraint functions are convex with respect to the follower’s variables. First, based on the features of the follower’s problem, we give a new decomposition scheme by which the follower’s optimal solution can be obtained easily. Then, to solve efficiently this class of problems by using evolutionary algorithm, novel evolutionary operators are designed by considering the best individuals and the diversity of individuals in the populations. Finally, based on these techniques, a new evolutionary algorithm is proposed. The numerical results on 20 test problems illustrate that the proposed algorithm is efficient and stable.
A New Preconditioner with Two Variable Relaxation Parameters for Saddle Point Linear Systems with Highly Singular(1,1) Blocks  [PDF]
Yuping Zeng, Chenliang Li
American Journal of Computational Mathematics (AJCM) , 2011, DOI: 10.4236/ajcm.2011.14030
Abstract: In this paper, we provide new preconditioner for saddle point linear systems with (1,1) blocks that have a high nullity. The preconditioner is block triangular diagonal with two variable relaxation paremeters and it is extension of results in [1] and [2]. Theoretical analysis shows that all eigenvalues of preconditioned matrix is strongly clustered. Finally, numerical tests confirm our analysis.
Research on Mechanism of Distributors’ Frequent Ordering Intention: A Prospect Theory Perspective  [PDF]
Bingqun Cui, Yuping Li
Modern Economy (ME) , 2015, DOI: 10.4236/me.2015.611110
Abstract: This article is to carry out in-depth mechanism exploration of influences of three different price promotion strategies on Distributors’ ordering intentions. This research finds out that Distributors have stronger intentions of determining ordering in the case of reward promotion rather than in threat promotion. However, among Distributors who have decided ordering, threat promotion can lead to stronger frequent ordering intention. Promotion intensity has strong adjustment effect on Distributors’ ordering intention both in reward and threat promotions. Rebates strategy has positive influence on Distributors’ intentions of both determining ordering and frequent ordering. The study reveals different price promotion strategies’ different influences on Distributors’ ordering intentions. This study provides a good reference for guiding enterprise managers’ application of price promotion.
Acute Myocardial Infarction in a 26-Year-Old Man with Normal ST-Segment  [PDF]
Yuping Yang, Hua Chen
Case Reports in Clinical Medicine (CRCM) , 2017, DOI: 10.4236/crcm.2017.66015
Abstract: Acute myocardial infarction (AMI) is rare in young adults. The management of these patients is considered as a clinical challenge. We report the case of a 26-year-old man who was presented to the Emergency Room of Affiliated Hospital of Guilin Medical University with an acute onset of chest pain. Initially electrocardiogram (ECG) with no evidence of ST-segment abnormalities but QT prolongation a signal of sudden cardiac death, 20 minutes later, it revealed ST-segment elevation myocardial infarction (STEMI). Coronary angiography (CAG) demonstrated left main coronary artery occlusion. AMI was diagnosed based on clinical symptom, elevated cardiac biomarkers, electrocardiographic dynamic monitoring and CAG. The awareness of chest pain as possible underlying AMI symptom—especially in young patients presenting with QT prolongation—is crucial for clinical treatment, as a missed diagnosis can worsen the patient’s further prognosis. In addition, reperfusion arrhythmia is a challenge to short-term outcomes of young patients with AMI, so it is necessary to make preoperative risk stratification.
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