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Search Results: 1 - 10 of 120312 matches for " XiaoYang Wang "
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Infection-Induced Vulnerability of Perinatal Brain Injury
Carina Mallard,Xiaoyang Wang
Neurology Research International , 2012, DOI: 10.1155/2012/102153
Abstract: A growing body of evidence demonstrates that susceptibility and progression of both acute and chronic central nervous system disease in the newborn is closely associated with an innate immune response that can manifest from either direct infection and/or infection-triggered damage. A common feature of many of these diseases is the systemic exposure of the neonate to bacterial infections that elicit brain inflammation. In recent years, the importance of innate immune receptors in newborn brain injury, the so-called Toll-like receptors, has been demonstrated. In this paper we will discuss how neonatal sepsis, with particular emphasis on Escherichia coli, coagulase-negative staphylococci, and group B streptococcal infections in preterm infants, and Toll-like receptor-mediated inflammation can increase the vulnerability of the newborn brain to injury. 1. Introduction Perinatal brain injury represents a significant clinical problem [1]. A growing body of evidence demonstrates that susceptibility and progression of both acute and chronic central nervous system (CNS) disease is closely associated with an innate immune response that can manifest from either direct infection and/or infection-triggered damage [2]. A common feature of these diseases is the systemic activation of inflammatory mediators, which via the blood can disrupt the blood-brain barrier, affect the circumventricular organs in the brain (which lack a blood-brain barrier), or interact with the brain endothelium, thereby eliciting brain inflammation [3]. Furthermore, the presence of activated inflammatory cells derived from systemic circulation or from dormant brain resident populations is a key feature of many CNS diseases. More recently, the importance of innate immune receptors in CNS injury, the so-called Toll-like receptors (TLRs), has also been emphasized. In this paper we will focus on how neonatal sepsis and TLR-mediated inflammation increase the vulnerability of the newborn brain. 2. Neonatal Sepsis and Brain Injury Infants with sepsis have an increased incidence of cerebral palsy [4] and white matter abnormalities [5–11]. In a large study of 6093 extremely low birth weight (<1000?g) infants, those who were infected (including early-onset sepsis, suspected sepsis (culture negative), and had necrotizing enterocolitis (NEC)) were more likely to have cerebral palsy than children who did not have a neonatal infection [12]. In another recent large sample-size study involving 1155 infants born at 23 to 27 weeks gestation, it was found that children who had both late bacteremia (positive blood
Pricing European Currency Options in a Fractional Brownian Motion with Jumps
Zheng Xiaoyang,Wang Jingyu
Journal of Economics Theory , 2012, DOI: 10.3923/jeth.2012.128.131
Abstract: Assuming that the interest is given, the principle of fair insurance premium-actuarial approach is used to deal with pricing formula of option on foreign currency option under the assumption that foreign currency option price process in a fractional Brownian motion with jumps and the pricing formulas of European foreign currency option are obtained. It has certain reference significance to avoiding foreign exchange risk.
PSO Algorithm for IPD Game
Xiaoyang Wang,Yibin Lin
International Journal of Computer Science & Information Technology , 2012,
Abstract: Mechanisms promoting the evolution of cooperation in two-player, two-strategy evolutionary games havebeen discussed in great detail over the past decades. Understanding the effects of repeated interactions inmulti-player with multi-choice is a formidable challenge. This paper presents and investigates theapplication of co-evolutionary training techniques based on particle swarm optimization (PSO) to evolvecooperation for the iterated prisoner’s dilemma (IPD) game with multiple choices in noisy environment.Several issues will be addressed, which include the evolution of cooperation and the evolutionary stabilityin the presence of multiple choices and noise. First is using PSO approach to evolve cooperation. Thesecond is the impact of noise on the evolution of cooperation is examined.
Unsupervised Feature Learning with C-SVDDNet
Dong Wang,Xiaoyang Tan
Computer Science , 2014,
Abstract: In this paper, we investigate the problem of learning feature representation from unlabeled data using a single-layer K-means network. A K-means network maps the input data into a feature representation by finding the nearest centroid for each input point, which has attracted researchers' great attention recently due to its simplicity, effectiveness, and scalability. However, one drawback of this feature mapping is that it tends to be unreliable when the training data contains noise. To address this issue, we propose a SVDD based feature learning algorithm that describes the density and distribution of each cluster from K-means with an SVDD ball for more robust feature representation. For this purpose, we present a new SVDD algorithm called C-SVDD that centers the SVDD ball towards the mode of local density of each cluster, and we show that the objective of C-SVDD can be solved very efficiently as a linear programming problem. Additionally, traditional unsupervised feature learning methods usually take an average or sum of local representations to obtain global representation which ignore spatial relationship among them. To use spatial information we propose a global representation with a variant of SIFT descriptor. The architecture is also extended with multiple receptive field scales and multiple pooling sizes. Extensive experiments on several popular object recognition benchmarks, such as STL-10, MINST, Holiday and Copydays shows that the proposed C-SVDDNet method yields comparable or better performance than that of the previous state of the art methods.
Experimental Research of Dual-Polarization Passive Radar Based on DTTB Signal  [PDF]
Yonghu Zeng, Xiaofeng Ai, Liandong Wang, Xiaoyang Wang, Guangyong Zheng
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.43016
Abstract:

The passive radar is a hot research topic. A multi-channel wideband passive radar experimental system is designed and the digital television terrestrial broadcasting (DTTB) signal is chosen to carry out the target detection experiment of civil aviation aircraft. The polarization and spatial filtering methods are used to solve the strong direct path interference suppression problems brought by the receiving system location; combined with the characteristics of DTTB signal, the block length selection interval in the block batch processing method for range-Doppler images calculation is given; the clutter suppression performance is compared through the experimental data receiving from different bistatic polarization channels, the conclusion is different from the monostatic radar and it can guide the passive radar experiment.

Research on Casing Damage Based on Effect of Water Injection Pressure  [PDF]
Liping Guo, Xu Chen, Xiaoyang Yu, Shuang Shi, Yu Wang
Open Journal of Fluid Dynamics (OJFD) , 2015, DOI: 10.4236/ojfd.2015.52023
Abstract: Based on statistical analysis on the situation of casing damage and water injection pressure in Pubei Oilfield, it shows that the main forms of casing damage in Pubei Oilfield are deformation and dislocation. Dip angle and faults have a significant impact on casing damage and casing damage is closely related to water injection pressure. Through laboratory simulating experiment and theoretical calculation, the formula of critical injection pressure giving rise to casing damage is obtained and the preventive measures are drafted.
Evaluation of Thixotropic Models for Waxy Crudes  [PDF]
Liping Guo, Xu Chen, Shuang Shi, Yu Wang, Xiaoyang Yu
Open Journal of Applied Sciences (OJAppS) , 2015, DOI: 10.4236/ojapps.2015.56031
Abstract: Thixotropy is a great rheological behavior of waxy crudes oils and is of great importance for hydraulic characteristics and security of oil pipeline restart. In this paper, through the experiment of four waxy crudes, three kinds of thixotropic rheology characteristics in the conditions that shear stress decays under a constant shear rate, shear stress decays after shear rate steps up and hysteresis loop of shear rate cycle changes are studied . For eight thixotropic models, experimental data are fitted in the method of least-squares and average deviation is taken as a statistical indicator to evaluate the thixotropic models. It shows that the model with the idea of Cheng that completely reversible and totally irreversible structures both exist in waxy oil products and based on Houska model can describe thixotropic behaviors of waxy crudes most well.
Study on Thixotropic Properties of Waxy Crude Oil Based on Hysteresis Loop Area  [PDF]
Liping Guo, Yu Wang, Shuang Shi, Xiaoyang Yu, Xu Chen
Engineering (ENG) , 2015, DOI: 10.4236/eng.2015.77043
Abstract: Thixotropic properties are one of the low temperature rheology behaviors of gelled waxy crudes. In order to study the thixotropic behavior of gelled waxy crudes oil under cyclic loading of linear increasing and decreasing of shear rate, three different types of waxy crude oil were studied ex-perimentally by using MARSIII rheometer. It is found that hysteresis loop area could represent strength of thixotropic properties under that loading. With increasing of the rate of share rate sweep, the area of second hysteresis loop is much smaller than first one and began a slow decline from the third hysteresis loop. Areas of each hysteresis loops were decreased with increasing temperature, but it was different in decline rate—the lower the temperature, the greater the rate of decline. The maximum rate of decrease is the first hysteresis loop with exponential decline, and remaining hysteresis hoops approximately decrease linearly. In addition, based on the experi-mental results an empirical correlation is developed to describe the relationship of hysteresis loop area and rate of share rate sweep.
Experimental Research on Toluene Degradation in Plasma as the Driving Force of Nanomaterials  [PDF]
Tao Zhu, Xiaoyang Li, Wenjuan Zhao, Ni Xia, Xiaojia Wang
Open Journal of Applied Sciences (OJAppS) , 2015, DOI: 10.4236/ojapps.2015.510057
Abstract: Plasma technology has some shortcomings, such as higher energy consumption and byproducts produced in the reaction process. However non-thermal plasma associated with catalyst can resolve these problems. So this kind of technology was paid more and more attention to treat waste gas. In this paper, we make use of this technology to decompose toluene under different electric field and packed materials. At the same time, the mechanism of toluene decomposition using plasma and catalyst is discussed. The experimental results show toluene decomposition increases with electric field strength increasing and flow velocity and initial concentration decreasing. There are four conditions in plasma: without packed materials (1); with packed materials (2); with BaTiO3 in the surfaces of packed materials (3); and with nanometer Ba0.8Sr0.2Zr0.1Ti0.9O3 (4). Toluene decomposition represents a obvious trend, that is, η(4) > η(3) > η(2) > η(1). The best decomposition efficiency of toluene arrives at 95%.
Study on the Pension Rights of Families That Have Lost Their Only Child  [PDF]
Xiaoyang Zhang
Beijing Law Review (BLR) , 2015, DOI: 10.4236/blr.2015.61003
Abstract: According to incomplete statistics, the number of families that have lost their only child had reached more than one million in China currently, following an annual increase by 76,000. The problem of elder care of these families that have lost their only child has become a hot issue in China. Legislation and relevant policies about families that have lost their only child are not sufficient, which have caused the lack of basis on establishing a reasonable elder care system of those families. This paper is aiming to address the rights as a core and further supplement on the basis of the present situation of families that have lost their only child, therefore implement to build the pension right system of loss of only child families. Meanwhile, we also strive to put forward specific advices on establishing legislation and relevant policies.
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