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Search Results: 1 - 10 of 43992 matches for " Shunquan Wu "
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Financial Classification of Listed Companies in China Based on BP Neural Network Method  [PDF]
Shunquan Zhu
Journal of Financial Risk Management (JFRM) , 2016, DOI: 10.4236/jfrm.2016.53017
Abstract:
Based on analyzing and studying back propagation (BP) neural network method, the article takes 38 cross-section data as modeling sample, and uses 18 data at the same time as the examination sample to establish the financial distinction model. Passed through training and studies repeatedly to the sample, we obtained the more precise forecast result. The findings indicated: the BP neural network is one kind of non-linear mapping model. In the situation that the degree of correlation among the indicators is high, or the data present nonlinearities change, or the data have omissions and so on, using BP neural network may obtain the quite satisfactory result, therefore it is a quite ideal forecast method, and has the widespread application scope and the high reference value.
Research on the Portfolio Optimization Model under Quantitative Constraint Based on Genetic Algorithm  [PDF]
Shunquan Zhu
Journal of Mathematical Finance (JMF) , 2016, DOI: 10.4236/jmf.2016.64037
Abstract: This paper is based on covariance and expected return, building portfolio risk optimization model. Using Genetic Algorithm and Quadratic Programming, three securities portfolio Optimization model is resolved, and we find that Genetic Algorithm having priority for Restraint Conditions is not a linear model.
The Corporate Financial Forecasting Based on Least Squares Support Vector Machines Methods  [PDF]
Shunquan Zhu
Technology and Investment (TI) , 2017, DOI: 10.4236/ti.2017.83013
Abstract: This paper analyzed the present domestic and foreign financial forecasting situation of listed companies and it is based on least squares support vector machines. According to our country’s capital markets, 44 listed companies are modeling data samples, 10 listed companies are forecasting data samples, and building financial forecasting model of listed companies obtains satisfaction financial forecasting results. The empirical study results show that we may use entirely least squares support vector machines methods to build financial forecasting models, and to distinguish financial credit risks of listed companies; comparing to traditional statistical methods and neural network methods, financial forecasting method based on least squares support vector machines is an ideal listed company’s financial forecasting method. It is used to extensive fields that have high extending value.
Incidence Analyses and Space-Time Cluster Detection of Hepatitis C in Fujian Province of China from 2006 to 2010
Shunquan Wu, Fuquan Wu, Rongtao Hong, Jia He
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0040872
Abstract: Background There is limited epidemiologic information about the incidence of hepatitis C in China, and few studies have applied space-time scan statistic to detect clusters of hepatitis C and made adjustment for temporal trend and relative risk of regions. Methodology and Principal Findings We analyzed the temporal changes and characteristics of incidence of hepatitis C in Fujian Province from 2006 through 2010. The discrete Poisson model of space-time scan statistic was chosen for cluster detection. Data on new cases of hepatitis C were obtained from the Center for Disease Control and Prevention of Fujian Province. Between 2006 and 2010, there was an annualized increase in the incidence of hepatitis C of 23.0 percent, from 928 cases (2.63 per 100,000 persons) to 2,180 cases (6.01 per 100,000 persons). The incidence among women increased more rapidly. The cumulative incidence showed that people who were over 60 years had the highest risk to suffer hepatitis C (52.51 per 100,000 persons), and women had lower risk compared to men (OR = 0.69). Putian had the highest cumulative incidence among all the regions (86.95 per 100,000 persons). The most likely cluster was identified in Putian during March to August in 2009 without adjustment, but it shifted to three contiguous cities with a two-month duration after adjustment for temporal trend and relative risk of regions. Conclusions/Significance The incidence of hepatitis C is increasing in Fujian Province, and women are at a more rapid pace. The space-time scan statistic is useful as a screening tool for clusters of hepatitis C, with adjustment for temporal trend and relative risk of regions recommended.
Epidemiology of Functional Abdominal Bloating and Its Impact on Health Related Quality of Life: Male-Female Stratified Propensity Score Analysis in a Population Based Survey in Mainland China
Meijing Wu, Yanfang Zhao, Rui Wang, Wenxin Zheng, Xiaojing Guo, Shunquan Wu, Xiuqiang Ma, Jia He
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0102320
Abstract: Background The epidemiology of Functional abdominal bloating (FAB) and its impact on health-related quality of life (HRQoL) in Chinese people remains unclear. Methods Randomised, stratified, multi-stage sampling methodology was used to select a representative sample of the general population from five cities in China (n = 16,078). All respondents completed the modified Rome II questionnaire; 20% were asked to complete the 36-item Short Form (SF-36). The associated factors of FAB were analyzed. The effects of FAB on HRQoL were estimated with gender stratification using propensity score techniques in 20% subsample. Results Overall, 643 individuals (4.00%) had FAB and it was more prevalent in males than in females (4.87% vs. 3.04%, P<0.001). For males, self-reported history of dyspepsia was most strongly associated with FAB (OR = 2.78; 95% CI: 1.59, 4.72). However, the most strongly associated factor was self-reported health status for females (moderate health vs. good health: OR = 2.06, 95% CI: 1.07, 3.96. P = 0.030; poor health vs. good health: OR = 5.71, 95% CI: 2.06, 15.09). Concerning HRQoL, FAB was found to be related to two domains: role limitation due to physical problems (P = 0.030) and bodily pain (P<0.001) in females. While, in males, there were significant differences in multiple domains between those with and without FAB. Conclusion The prevalence of FAB in China was lower than previous reports. Males who had ever been diagnosed with dyspepsia and females who were in a poor self-reported health status were correlated with a higher prevalence of FAB. FAB affected only physical health in females, but impaired both physical and mental health in males.
Incidence and Risk of QTc Interval Prolongation among Cancer Patients Treated with Vandetanib: A Systematic Review and Meta-analysis
Jiajie Zang, Shunquan Wu, Lei Tang, Xudong Xu, Jie Bai, Caicui Ding, Yue Chang, Long Yue, Enming Kang, Jia He
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0030353
Abstract: Background Vandetanib is a multikinase inhibitor that is under assessment for the treatment of various cancers. QTc interval prolongation is one of the major adverse effects of this drug, but the reported incidence varies substantially among clinical trials. We performed a systematic review and meta-analysis to obtain a better understanding in the risk of QTc interval prolongation among cancer patients administered vandetanib. Methodology and Principal Findings Eligible studies were phase II and III prospective clinical trials that involved cancer patients who were prescribed vandetanib 300 mg/d and that included data on QTc interval prolongation. The overall incidence and risk of QTc interval prolongation were calculated using random-effects or fixed-effects models, depending on the heterogeneity of the included studies. Nine trials with 2,188 patients were included for the meta-analysis. The overall incidence of all-grade and high-grade QTc interval prolongation was 16.4% (95% CI, 8.1–30.4%) and 3.7% (8.1–30.4%), respectively, among non-thyroid cancer patients, and 18.0% (10.7–28.6%) and 12.0% (4.5–28.0%), respectively, among thyroid cancer patients. Patients with thyroid cancer who had longer treatment duration also had a higher incidence of high-grade events, with a relative risk of 3.24 (1.57–6.71), than patients who had non-thyroid cancer. Vandetanib was associated with a significantly increased risk of all-grade QTc interval prolongation with overall Peto odds ratios of 7.26 (4.36–12.09) and 5.70 (3.09–10.53) among patients with non-thyroid cancer and thyroid cancer, respectively, compared to the controls. Conclusions/Significance Treatment with vandetanib is associated with a significant increase in the overall incidence and risk of QTc interval prolongation. Different cancer types and treatment durations may affect the risk of developing high-grade QTc interval prolongation.
Tunable giant exchange bias in single-phase rare earth-transition metal intermetallics YMn12-xFex with highly homogenous inter-sublattice exchange coupling
Yuanhua Xia,Rui Wu,Shunquan Liu,Honglin Du,Jingzhi Han,Changsheng Wang,Xiping Chen,Lei Xie,Y. C. Yang,Jinbo Yang
Physics , 2015,
Abstract: In this paper, we have found a family of intermetallic compounds YMn12-xFex (x = 6.6-8.8) showing a bulk form of tunable giant exchange bias effect which arises from global interactions among ferromagnetic (FM) and antiferromagnetic (AFM) sublattices but not the interfacial exchange coupling or inhomogeneous magnetic clusters. A giant exchange bias with a loop shift up to 6.1 kOe has been observed in YMn4.4Fe7.6 compound with the strongest competing magnetic interactions. In a narrow temperature range, the exchange bias field shows a sudden switching off whereas the coercivity shows a sudden switching on with increasing temperature. This unique feature indicates that the inter-sublattice exchange coupling is highly homogenous, which can be perfectly interperated by our theoretical calculations.
Relationships between energy consumption and climate change in China

QIAN Huaisui,YUAN Shunquan,SUN Jiulin,LI Zehui,

地理学报 , 2004,
Abstract: Energy consumption has an inevitable connection with economic level and climate. Based on selected data covering annual total energy consumption and its composition and that of all kinds of energy in 1953-1999, the annual residential energy consumption and the coal and electricity consumption in 1980-1999 in China, the acreage of crops under cultivation suffered from drought and flood annually and gross domestic product (GDP) in 1953-1999 in the whole country, and mean daily temperature data from 29 provincial meteorological stations in the whole country from 1970 to 1999, this paper divides energy consumption into socio-economic energy consumption and climatic energy consumption in the way of multinomial. It also goes further into the relations and their changes between the climate energy consumption and climate factor and between the socio-economic energy consumption and the economic level in China with the method of statistical analysis. At present, there are obvious transitions in the changing relationships of the energy consumption to economy and climate, which comprises the transition of economic system from resource-intensive industry to technology-intensive industry and the transition of climatic driving factors of the energy consumption from driven by the disasters of drought and flood to driven by temperature.
A Preliminarily Phylogeny Study of the Eriobotrya Based on the nrDNA Adh Sequences
Yang XINAGHUI,Li PING,Lin SHUNQUAN,Hu GUIBIN
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2012,
Abstract: Phylogenetic relationships of the genus Eriobotrya Lindl. were examined based on the nrDNA Adh sequences. A phylogenetic tree of 14 loquat accessions (species, varieties and forma) was generated by using Photinieae serrulaia L. as an outgroup and Rhaphiolepis indica (L.) Lindl. as an ingroup, which represent the two closest genera of Eriobotyra. The results showed that these loquat accessions were divided into two main clades in the consensus tree. Clade I included E. seguinii Card and group A formed by E. henryi Nakai, E.bengalensis Hook.f., and forma angustifolia Vidal. Clade II is composed of the other taxas which included three groups. E. cavaleriei Rehd and E. fragrans Champ formed group B; group C consisted of E. prinoides Rehd. & Wils. var. dadunensis H.Z.Zhang, and E. japonica Lindl.; and group D included E. deflexa Nakai and E. deflexa Nakai Var.buisanensis NaKai. Since E. deflexa Nakai, E. deflexa Nakai Var.buisanensis NaKai and E. kwangsiensis Chun, were closer in the phylogenetic tree; while E. prinoides Rehd. & Wils. var. dadunensis H.Z.Zhang, E. japonica Lindl, E. prinoides Rehd & Wils and E.elliptica Lindl. were close with each other, they may be locataed at a similar place of the phylogenetic stage. However, E. malipoensis Kuan need further studies on its phylogenetis relationship for it was separated from the others. Results further support the theory that E. cavaleriei Rehd could be a variety of E. fragrans Champ.
JPEG Noises beyond the First Compression Cycle
Bin Li,Tian-Tsong Ng,Xiaolong Li,Shunquan Tan,Jiwu Huang
Computer Science , 2014,
Abstract: This paper focuses on the JPEG noises, which include the quantization noise and the rounding noise, during a JPEG compression cycle. The JPEG noises in the first compression cycle have been well studied; however, so far less attention has been paid on the JPEG noises in higher compression cycles. In this work, we present a statistical analysis on JPEG noises beyond the first compression cycle. To our knowledge, this is the first work on this topic. We find that the noise distributions in higher compression cycles are different from those in the first compression cycle, and they are dependent on the quantization parameters used between two successive cycles. To demonstrate the benefits from the statistical analysis, we provide two applications that can employ the derived noise distributions to uncover JPEG compression history with state-of-the-art performance.
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