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Search Results: 1 - 10 of 11533 matches for " Cao Jialin "
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Finite Element Approximations for Semilinear Elliptic Stochastic Partial Differential Equations with Additive Gaussian Noises
Yanzhao Cao,Jialin Hong,Zhihui Liu
Mathematics , 2015,
Abstract: We study finite element approximations for boundary value problems of elliptic semilinear stochastic partial differential equations (SPDEs) driven by Gaussian noises. Formulated in the form of Karhunen-Lo\`{e}ve (K-L) expansions, the noises cover some of the most commonly used special cases in physics and engineering applications, including white noises and colored noises characterized by the power-law in non-rectangular domains. Through the convergence analysis for a sequence of approximate solutions of SPDEs where the noises are the truncations of the K-L expansions, we obtain covariance operator dependent sufficient and necessary conditions for the well-posedness of the continuous problem. These SPDEs with truncated noises are then used to construct finite element approximations. A general framework of rigorous error estimates for the finite element approximations is established for the Gaussian noises in the abstract K-L expansion forms. Based on this general framework and with the help of Weyl's law, we derive optimal error estimates for finite element approximations of SPDEs driven by white noises and power-law noises. The error analysis illustrates the effect of the coefficients of the K-L expansions on the overall optimal error estimate of the finite element approximation.
Finite Element Approximations for Semilinear Elliptic SPDEs driven by Fractional Brownian Motion with Hurst Parameter $H<\frac{1}{2}$
Yanzhao Cao,Jialin Hong,Zhihui Liu
Mathematics , 2015,
Abstract: We consider finite element approximations for one dimensional boundary value problems of semilinear elliptic stochastic partial differential equations (SPDEs) driven by a fractional Brownian motion with Hurst parameter $H<1/2$ based on the well-posedness of the problem. We make use of a sequence of approximate solutions with the fractional Brownian noise replaced by its piecewise constant discretization to construct the finite element approximations of the SPDEs. The error estimate of the approximations is derived through rigorous convergence analysis.
Centrality-based pathway enrichment: a systematic approach for finding significant pathways dominated by key genes
Zuguang Gu, Jialin Liu, Kunming Cao, Junfeng Zhang, Jin Wang
BMC Systems Biology , 2012, DOI: 10.1186/1752-0509-6-56
Abstract: A systematic and extensible pathway enrichment method in which nodes are weighted by network centrality was proposed. We demonstrate how choice of pathway structure and centrality measurement, as well as the presence of key genes, affects pathway significance. We emphasize two improvements of our method over current methods. First, allowing for the diversity of genes’ characters and the difficulty of covering gene importance from all aspects, we set centrality as an optional parameter in the model. Second, nodes rather than genes form the basic unit of pathways, such that one node can be composed of several genes and one gene may reside in different nodes. By comparing our methodology to the original enrichment method using both simulation data and real-world data, we demonstrate the efficacy of our method in finding new pathways from biological perspective.Our method can benefit the systematic analysis of biological pathways and help to extract more meaningful information from gene expression data. The algorithm has been implemented as an R package CePa, and also a web-based version of CePa is provided.As omics and high throughput technology continues to develop, researchers can increasingly understand biological phenomena at the systems level; that is, can elucidate the complicated interactions between genes and molecules responsible for biological functions [1]. Microarray technology has been widely used to measure gene expression profiles and has produced huge amounts of data for biological analysis [2]. However, traditional single gene analysis tells us little about the cooperative roles of genes in real biological systems. New challenges for microarray data analysis are to find specific biological functions affected by a group of related genes. Biological pathways are sets of genes or molecules that act together by chemical reactions, molecule modifications or signalling transduction to carry out such functions [3]. Since pathways are essentially integrated ci
New Insights into Human Resource Management of Large Public Hospitals with Multi Campuses in China  [PDF]
Jialin Yang, Huafeng Cheng
Journal of Human Resource and Sustainability Studies (JHRSS) , 2015, DOI: 10.4236/jhrss.2015.33016
Abstract: Human resource departments of large public hospitals in China deal with new challenges caused by multi-campus structure, such as increased labor demand, difficulty in cost management, lack of professional talents, restriction on employing way and etc. Delphi Method and Focus Group were used as the chief methods to analyze the problems. Countermeasures are researched as staffing optimization, performance management, forming Expert Center, establishing HRM Framework based on the positions among campus and restricting the human resource department. The researches break away from traditional human resource practices, develop new application for future trends, and adapt to the changes of business in the country’s public hospital reform.
Fabrication and Analysis of Vanadium-Based Metal Powders for Selective Laser Melting  [PDF]
Jialin Yang, Jingfeng Li
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2018, DOI: 10.4236/jmmce.2018.61005
Abstract: Vanadium Alloy is a type of advanced nuclear material with many ideal properties compared as traditional nuclear materials, which has very wide and important application in first-wall and blanket structural material for fusion power plant applications. So it has attracted increasing attentions, especially on new manufacturing methods, such as selective laser melting and so on. In this paper, the comparative study of the powders obtained by mechanical mixing method, dry grinding method and wet grinding method respectively was performed to evaluate the effect of ball milling process on the microstructure and degree of alloying of the vanadium-based powder mixtures with the nominal composition of V5Cr5Ti vanadium alloy. The powders prepared by dry grinding method exhibits better spherical-like morphology and degree of alloying than those prepared by mechanical mixing method and wet grinding method, which indicates that dry grinding method can be used to prepare the superfine vanadium alloy powders for selective laser melting. This work provides a new method as well as important insights into the preparation of superfine vanadium alloy powders for selective laser melting additive manufacturing technology.
New Standpoint of ALT Test for Blood Safety in Dongguan Blood Center  [PDF]
Ziyi He, Fuping Liu, Dewen Wang, Jialin Che, Jialin Che
Open Journal of Clinical Diagnostics (OJCD) , 2014, DOI: 10.4236/ojcd.2014.41008
Abstract: Objective: To investigate the relationship between the single ALT positive (ELSIA-HBV/HCV negative) and NAT-HBV/HCV on blood donor samples. Methods: 28710 samples were surveyed retrospectively from Dec. 2010 to Dec. 2011. ALT was detected by rate method, and the single ALT positive samples were detected by ELSIA-HBV/HCV and NAT-HBV/HCV. The relationship between the single ALT positive and NAT-HBV/HCV were analyzed. 21 samples, values in 40 U/L ≤ ALT ≤ 70 U/L, were selected at random from 2516 samples with single ALT positive, which were second detected by ELISA and NAT in the second donation. Results: 2516 (8.74%) single ALT positive samples (ELSIA-HBV/HCV negative) were found in 28710 donors. Among these samples, 8 (2.8/10000) positive were detected by NAT, including 5 HBV-DNA-positive and 3 HCV-RNA-positive. Obviously, positive rate of NAT from the donors whose ALT value ≤ 70 U/L were lower than those of ≥ 71 U/L (P < 0.01). 21 donors were investigated in the second donation in following 153 to 401 days, All samples were negative by ELISA-HBV/HCV and NAT-HBV/HCV. Conclusions: Donors with single ALT positive (value in 40 U/L-70 U/L) are not likely to become HBV/HCV virus carriers or HBV/HCV patients after half or one year. So it is to set ALT abandone threshlod to ≤ 70 U/L can ensure blood safety, and reduce blood abandone in our center.
An Analytic Hedging Model of Energy Quanto Contracts  [PDF]
Sang Baum Kang, Jialin Zhao
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.74053
Abstract: Earnings of energy firms are exposed to a joint risk of energy price and energy consumption. The correlated fluctuations in both price and consumption present a joint risk of price and volume for a load-serving entity (LSE). In order to manage such a joint risk, LSEs take positions in a variety of hedging contracts. Among these financial instruments, we analyze the use of electricity-temperature quantity-adjusting (quanto) contracts. In this paper, we consider an LSE that has access to electricity price derivatives, temperature derivatives, and energy quanto contracts. We derive the closed-form optimal hedging positions in these contracts and the optimal mean-variance tradeoff, from an analytic model that we develop within the Constant Absolute Risk Aversion (CARA)-normal setting. We mathematically prove that the use of quanto contracts allows an LSE to lower its revenue volatility. Furthermore, our model offers novel economic insights into the application of energy quanto contracts to hedging practice. First, we document and quantify the “dirty hedge” of standardized price and temperature derivatives in the absence of tailor-made energy quanto contracts. Second, we derive a threshold price of energy quanto contracts. If an energy quanto contract is quoted above this threshold price, an LSE shall not trade such a contract for risk management purposes. Third, this paper investigates a questionable, yet commonly adopted practice of using temperature as a perfect proxy for power consumption.
Positive Well-Being and Work-Life Balance among UK Railway Staff  [PDF]
Jialin Fan, Andrew P. Smith
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.56001
Failure to manage the well-being and work-life balance of railway workers may result in an increased risk to train safety and employees’ health. This article reports the findings of a study that measured positive well-being and work-life balance, and identified the factors affecting these among UK railway staff. On the whole, staff who perceived high levels of control and support had a better work-life balance and an increased sense of well-being. A positive personality was associated with positive well-being both at work and outside of work.
The Mediating Effect of Fatigue on Work-Life Balance and Positive Well-Being in Railway Staff  [PDF]
Jialin Fan, Andrew P. Smith
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.66001
Both fatigue and negative work-life balance can be influenced by job characteristics and individual differences, while fatigue is associated with reduced positive well-being. This paper reports a study that investigated the mediation effect of fatigue between those stressors and well-being outcomes among UK railway staff. A large number of significant mediation effects of fatigue were found in this study, and as a result, the process by which job demands, job support and control influence major positive well-being outcomes can be partially explained by fatigue.
Ishikawa iteration process with errors for nonexpansive mappings
Jialin Huang
International Journal of Mathematics and Mathematical Sciences , 2001, DOI: 10.1155/s0161171201005452
Abstract: We study the construction and the convergence of the Ishikawa iterative process with errors for nonexpansive mappings in uniformly convex Banach spaces. Some recent corresponding results are generalized.
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