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Search Results: 1 - 10 of 127245 matches for " Yuping Li "
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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.
A Survey of Gratitude Awareness of Chinese College Students  [PDF]
Xiaojuan Li, Yuping Li
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.814154
Abstract: By doing a questionnaire survey of the gratitude awareness situation among the students of one university in Guangzhou, we had an overview of the gratitude awareness of the students. Based on this survey, it is advocated that college students’ gratitude education should be promoted on the basis of Chinese traditional cultural education; disadvantaged students should be paid more attention; teachers should set good examples; and the gratitude education should be enriched to make it more social; etc.
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.
New Preconditioners with Two Variable Relaxation Parameters for the Discretized Time-Harmonic Maxwell Equations in Mixed Form
Yuping Zeng,Chenliang Li
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/617390
Abstract: We provide new preconditioners with two variable relaxation parameters for the saddle point linear systems arising from finite element discretization of time-harmonic Maxwell equations in mixed form. The new preconditioners are of block-triangular forms and Schur complement-free. They are extensions of the results in Cheng et al., 2009, Grief and Schötzau, 2007, and Huang et al., 2009. Theoretical analysis shows that all eigenvalues of the preconditioned matrices are tightly clustered, and numerical tests confirm our analysis.
Discerning the Subfibrillar Structure of Mineralized Collagen Fibrils: A Model for the Ultrastructure of Bone
Yuping Li, Conrado Aparicio
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0076782
Abstract: Biomineralization templated by organic molecules to produce inorganic-organic nanocomposites is a fascinating example of nature using bottom-up strategies at nanoscale to accomplish highly ordered multifunctional materials. One such nanocomposite is bone, composed primarily of hydroxyapatite (HA) nanocrystals that are embedded within collagen fibrils with their c-axes arranged roughly parallel to the long axis of the fibrils. Here we discern the ultra-structure of biomimetic mineralized collagen fibrils (MCFs) as consisting of bundles of subfibrils with approximately 10 nm diameter; each one with an organic-inorganic core-shell structure. Through an amorphous calcium phosphate precursor phase the HA nanocrystals were specifically grown along the longitudinal direction of the collagen microfibrils and encapsulated them within the crystal lattice. They intercalated throughout the collagen fibrils such that the mineral phase surrounded the surface of collagen microfibrils forming an interdigitated network. It appears that this arrangement of collagen microfibrils in collagen fibrils is responsible for the observed ultrastructure. Such a subfibrillar nanostructure in MCFs was identified in both synthetic and natural bone, suggesting this is the basic building block of collagen-based hard tissues. Insights into the ultrastructure of mineralized collagen fibrils have the potential to advance our understanding on the biomineralization principles and the relationship between bone’s structure and mechanical properties, including fracture toughness mechanisms. We anticipate that these principles from biological systems can be applied to the rational design of new nanocomposites with improved performance.
Information Transfer Index-A Promising Measure of the Corticomusclar Interaction  [PDF]
Ping Xie, Peipei Ma, Xiaoling Chen, Xiaoli Li, Yuping Su
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B012

It is generally believed that a major cause of motor dysfunction is the impairment in neural network that controls movement. But little is known about the underlying mechanisms of the impairment in cortical control or in the neural connections between cortex and muscle that lead to the loss of motor ability. So understanding the functional connection between motor cortex and effector muscle is of utmost importance. Previous study mostly relied on cross-correlation, coherence functions or model based approaches such as Granger causality or dynamic causal modeling. In this work the information transfer index (ITI) was introduced to describe the information flows between motor cortex and muscle. Based on the information entropy the ITI can detect both linear and nonlinear interaction between two signals and thus represent a very comprehensive way to define the causality strength. The applicability of ITI is investigated based on simulations and electroencephalogram (EEG), surface electromyography (sEMG) recordings in a simple motor task.

An Operational Approach to Belief Revision
Zhang Yuping,Li Wei,
Zhang Yuping
,Li Wei

计算机科学技术学报 , 1996,
Abstract: A deduction system, called RE-proof system, is constructed for generating the revisions of first order belief sets. When a belief set is rejected by a given fact, all maximal subsets of the belief set consistent with the fact can be deduced from the proof system. The soundness and completeness of the RE-proof system are proved, which imply that there exists a resolution method to decide whether a revision retains a mtalmal subset of a belief set.
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%.
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