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Search Results: 1 - 10 of 120110 matches for " Guofei Wang "
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Credit Constraints and Household Selection of Financial Assets  [PDF]
Guofei Wang
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.42009
Abstract: Based on the micro-data of China Household Finance Survey, this paper analyzes the effects of credit constraints on household selection of financial assets empirically. The results show that credit constraints have the significant negative impact on participation rate and allocation ratio of savings, stock, risky financial assets. Credit constraints keep families from holding much savings. Those families who face credit constraints have to use their own money to meet the demand of funds without bank loans. Those families who face credit constraints are no willing to invest in stock market and hold less risky assets because of their lower risk tolerance. Besides, credit constraints can increase the participation rate of informal borrowing and reduce household private lending. There are few domestic articles analyzing the relationship between credit constraints and household selection of financial assets. Therefore, this paper can be more of reference value for the follow-up study. Meanwhile, the results show that reducing credit constraints is helpful for the household participation in capital market.
An AMPK paradox in pulmonary arterial hypertension  [PDF]
Miranda Sun, Guofei Zhou
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.611136

Adenosine monophosphate-activated protein kinase (AMPK) is a heterotrimeric serine-threonine kinase important as a metabolic sensor for intracellular ATP levels and plays a key role in regulating cell survival and proliferation, particularly when cells are exposed to hypoxia. AMPK is critical for lung function, and abnormal AMPK signaling participates in many lung diseases. Recent studies suggest that both inhibition and activation of AMPK are preventive for the development of pulmonary arterial hypertension (PAH). However, the molecular mechanisms by which inhibition or activation of AMPK affects pulmonary hypertension (PH) appear to be distinct. Inhibition of AMPK by compound C blocks hypoxia-induced autophagy and induces apoptosis in pulmonary artery smooth muscle cells, leading to prevention of PAH; activation of AMPK by metformin attenuates the PH phenotype induced by hypoxia by regulating endothelial cell function. These seemingly opposing data on the function of AMPK in PH can be partly explained by off-target and compartment-specific effects of AMPK inhibitors and activators and the differentiated expression of AMPK in various cell types and subcellular locations. To elucidate the specific roles of AMPK in the pathogenesis of PAH, it is important to study the role of AMPK in a tissue specific manner combining genetic and biochemical approaches.


The processes and characteristics of mass balance on the Urumqi Glacier No. 1 during 1958–2009
WenBin Wang,ZhongQin Li,GuoFei Zhang,XuLiang Li
寒旱区科学 , 2012,
Some New Methods for Constructing 4-critical Planar Graphs
Guofei Zhou
Mathematics , 2015,
Abstract: A graph $G$ is said to be $k$-critical if $G$ is $k$-colorable and $G-e$ is not $k$-colorable for every edge $e$ of $G$. In this paper, we present some new methods from two or more small 4-critical graphs to construct a larger 4-critical planar graphs.
Fuzzy Nonlinear Proximal Support Vector Machine for Land Extraction Based on Remote Sensing Image
Xiaomei Zhong, Jianping Li, Huacheng Dou, Shijun Deng, Guofei Wang, Yu Jiang, Yongjie Wang, Zebing Zhou, Li Wang, Fei Yan
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069434
Abstract: Currently, remote sensing technologies were widely employed in the dynamic monitoring of the land. This paper presented an algorithm named fuzzy nonlinear proximal support vector machine (FNPSVM) by basing on ETM+ remote sensing image. This algorithm is applied to extract various types of lands of the city Da’an in northern China. Two multi-category strategies, namely “one-against-one” and “one-against-rest” for this algorithm were described in detail and then compared. A fuzzy membership function was presented to reduce the effects of noises or outliers on the data samples. The approaches of feature extraction, feature selection, and several key parameter settings were also given. Numerous experiments were carried out to evaluate its performances including various accuracies (overall accuracies and kappa coefficient), stability, training speed, and classification speed. The FNPSVM classifier was compared to the other three classifiers including the maximum likelihood classifier (MLC), back propagation neural network (BPN), and the proximal support vector machine (PSVM) under different training conditions. The impacts of the selection of training samples, testing samples and features on the four classifiers were also evaluated in these experiments.
Soil-Transmitted Helminth Infections and Correlated Risk Factors in Preschool and School-Aged Children in Rural Southwest China
Xiaobing Wang, Linxiu Zhang, Renfu Luo, Guofei Wang, Yingdan Chen, Alexis Medina, Karen Eggleston, Scott Rozelle, D. Scott Smith
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0045939
Abstract: We conducted a survey of 1707 children in 141 impoverished rural areas of Guizhou and Sichuan Provinces in Southwest China. Kato-Katz smear testing of stool samples elucidated the prevalence of ascariasis, trichuriasis and hookworm infections in pre-school and school aged children. Demographic, hygiene, household and anthropometric data were collected to better understand risks for infection in this population. 21.2 percent of pre-school children and 22.9 percent of school aged children were infected with at least one of the three types of STH. In Guizhou, 33.9 percent of pre-school children were infected, as were 40.1 percent of school aged children. In Sichuan, these numbers were 9.7 percent and 6.6 percent, respectively. Number of siblings, maternal education, consumption of uncooked meat, consumption of unboiled water, and livestock ownership all correlated significantly with STH infection. Through decomposition analysis, we determined that these correlates made up 26.7 percent of the difference in STH infection between the two provinces. Multivariate analysis showed that STH infection is associated with significantly lower weight-for-age and height-for-age z-scores; moreover, older children infected with STHs lag further behind on the international growth scales than younger children.
New proof of a Theorem on k-hypertournament losing scores
S. Pirzada,Zhou Guofei
Mathematics , 2006,
Abstract: In this paper, we give a new and short proof of a Theorem on k-hypertournament losing scores due to Zhou et al.[7].
Constructing a Family of 4-Critical Planar Graphs with High Edge-Density
Yao Tianxing,Zhou Guofei
Mathematics , 2015,
Abstract: A graph $G=(V,E)$ is a $k$-critical graph if $G$ is not $(k -1)$-colorable but $G-e$ is $(k-1)$-colorable for every $e\in E(G)$. In this paper, we construct a family of 4-critical planar graphs with $n$ vertices and $\frac{7n-13}{3}$ edges. As a consequence, this improved the bound for the maximum edge density obtained by Abbott and Zhou. We conjecture that this is the largest edge density for a 4-critical planar graph.
On k-hypertournament losing scores
Shariefuddin Pirzada,Guofei Zhou
Computer Science , 2010,
Abstract: We give a new and short proof of a theorem on k-hypertournament losing scores due to Zhou et al. [G. Zhou, T. Yao, K. Zhang, On score sequences of k-tournaments, European J. Comb., 21, 8 (2000) 993-1000.]
Soil-Transmitted Helminths in Southwestern China: A Cross-Sectional Study of Links to Cognitive Ability, Nutrition, and School Performance among Children
Chengfang Liu?,Renfu Luo?,Hongmei Yi?,Linxiu Zhang?,Shaoping Li?,Yunli Bai?,Alexis Medina?,Scott Rozelle?,Scott Smith?,Guofei Wang
PLOS Neglected Tropical Diseases , 2015, DOI: 10.1371/journal.pntd.0003877
Abstract: Background Empirical evidence suggests that the prevalence of soil-transmitted helminth (STH) infections in remote and poor rural areas is still high among children, the most vulnerable to infection. There is concern that STH infections may detrimentally affect children’s healthy development, including their cognitive ability, nutritional status, and school performance. Medical studies have not yet identified the exact nature of the impact STH infections have on children. The objective of this study is to examine the relationship between STH infections and developmental outcomes among a primary school-aged population in rural China. Methodology/Principal Findings We conducted a large-scale survey in Guizhou province in southwest China in May 2013. A total of 2,179 children aged 9-11 years living in seven nationally-designated poverty counties in rural China served as our study sample. Overall, 42 percent of the sample’s elementary school-aged children were infected with one or more of the three types of STH—Ascaris lumbricoides (ascaris), Trichuris trichuria (whipworm) and the hookworms Ancylostoma duodenale or Necator americanus. After controlling for socioeconomic status, we observed that infection with one or more STHs is associated with worse cognitive ability, worse nutritional status, and worse school performance than no infection. This study also presents evidence that children with Trichuris infection, either infection with Trichuris only or co-infected with Trichuris and Ascaris, experience worse cognitive, nutritional and schooling outcomes than their uninfected peers or children infected with only Ascaris. Conclusions/Significance We find that STH infection still poses a significant health challenge among children living in poor, rural, ethnic areas of southwest China. Given the important linkages we find between STH infection and a number of important child health and educational outcomes, we believe that our results will contribute positively to the debate surrounding the recent Cochrane report.
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