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Search Results: 1 - 10 of 16855 matches for " WeiRong Zhong "
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Stochastic resonance in the growth of a tumor induced by correlated noises
Weirong Zhong,Yuanzhi Shao,Zhenhui He
Chinese Science Bulletin , 2005, DOI: 10.1007/BF03183733
Abstract: Multiplicative noise is found to divide the growth law of tumors into two parts in a logistic model, which is driven by additive and multiplicative noises simultaneously. The Fokker-Planck equation was also derived to explain the fact that the influence of the intensity of multiplicative noise on the growth of tumor cells has a stochastic resonance-like characteristic. An appropriate intensity of multiplicative noise is benefit to the growth of the tumor cells. The correlation between two sorts of noises weakens the stochastic resonance-like characteristic. Homologous noises promote the growth of the tumor cells.
Nonequilibrium dynamic transition in a kinetic Ising model driven by both deterministic modulation and correlated stochastic noises
Yuanzhi Shao,Weirong Zhong,Zhenhui He
Chinese Science Bulletin , 2005, DOI: 10.1007/BF03183630
Abstract: We report the nonequilibrium dynamical phase transition (NDPT) appearing in a kinetic Ising spin system (ISS) subject to the joint application of a deterministic external field and the stochastic mutually correlated noises simultaneously. A time-dependent Ginzburg-Landau stochastic differential equation, including an oscillating modulation and the correlated multiplicative and additive white noises, was addressed and the numerical solution to the relevant Fokker-Planck equation was presented on the basis of an average-period approach of driven field. The correlated white noises and the deterministic modulation induce a kind of dynamic symmetry-breaking order, analogous to the stochastic resonance in trend, in the kinetic ISS, and the reentrant transition has been observed between the dynamic disorder and order phases when the intensities of multiplicative and additive noises were changing. The dependencies of a dynamic order parameterQ upon the intensities of additive noiseA and multiplicative noiseM, the correlation λ between two noises, and the amplitude of applied external fieldh were investigated quantitatively and visualized vividly. Here a brief discussion is given to outline the underlying mechanism of the NDPT in a kinetic ISS driven by an external force and correlated noises.
Nonequilibrium dynamic transition in a kinetic Ising model driven by both deterministic modulation and correlated stochastic noises
Yuanzhi Shao,Weirong Zhong,Zhenhui He
Physics , 2006,
Abstract: We report the nonequilibrium dynamical phase transition (NDPT) appearing in a kinetic Ising spin system (ISS) subject to the joint application of a deterministic external field and the stochastic mutually correlated noises simultaneously. A time-dependent Ginzburg-Landau stochastic differential equation, including an oscillating modulation and the correlated multiplicative and additive white noises, was addressed and the numerical solution to the relevant Fokker-Planck equation was presented on the basis of an average-period approach of driven field. The correlated white noises and the deterministic modulation induce a kind of dynamic symmetry-breaking order, analogous to the stochastic resonance in trend, in the kinetic ISS, and the reentrant transition has been observed between the dynamic disorder and order phases when the intensities of multiplicative and additive noises were changing. The dependencies of a dynamic order parameter Q upon the intensities of additive noise A and multiplicative noise M, the correlation lmda between two noises, and the amplitude of applied external field h were investigated quantitatively and visualized vividly. A brief discussion was given to outline the underlying mechanism of the NDPT in a kinetic ISS driven by an external force and correlated noises. Keywords: Ising spin system, nonequilibrium dynamical phase transition, stochastic resonance, correlated noises, TDGL model. PACS: 75.10.Hk, 64.60.Ht, 05.10.Gg, 76.20.+q
Scaling Dynamic Response and Destructive Metabolism in an Immunosurveillant Anti-Tumor System Modulated by Different External Periodic Interventions
Yuanzhi Shao,Wenyong Hu,Weirong Zhong,Li Li
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0016115
Abstract: On the basis of two universal power-law scaling laws, i.e. the scaling dynamic hysteresis in physics and the allometric scaling metabolism in biosystem, we studied the dynamic response and the evolution of an immunosurveillant anti-tumor system subjected to a periodic external intervention, which is equivalent to the scheme of a radiotherapy or chemotherapy, within the framework of the growth dynamics of tumor. Under the modulation of either an abrupt or a gradual change external intervention, the population density of tumors exhibits a dynamic hysteresis to the intervention. The area of dynamic hysteresis loop characterizes a sort of dissipative-therapeutic relationship of the dynamic responding of treated tumors with the dose consumption of accumulated external intervention per cycle of therapy. Scaling the area of dynamic hysteresis loops against the intensity of an external intervention, we deduced a characteristic quantity which was defined as the theoretical therapeutic effectiveness of treated tumor and related with the destructive metabolism of tumor under treatment. The calculated dose-effectiveness profiles, namely the dose cumulant per cycle of intervention versus the therapeutic effectiveness, could be well scaled into a universal quadratic formula regardless of either an abrupt or a gradual change intervention involved. We present a new concept, i.e., the therapy-effect matrix and the dose cumulant matrix, to expound the new finding observed in the growth and regression dynamics of a modulated anti-tumor system.
The growth dynamics of tumor subject to both immune surveillance and external therapy intervention
YuanZhi Shao,WeiRong Zhong,FengHua Wang,ZhenHui He,ZhongJun Xia
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0234-9
Abstract: Considering the growth of tumor cells modeled by an enzyme dynamic process under an immune surveillance, we studied in anti-tumor immunotherapy the single-variable growth dynamics of tumor cells subject to a multiplicative noise and an external therapy intervention simultaneously. The law of tumor growth of the above anti-tumor immunotherapy model was revealed through numerical simulations to the relevant stochastic dynamic differential equation. Two simulative parameters of therapy, i.e., therapy intensity and therapy duty-cycle, were introduced to characterize a treatment process similar to a tumor clinic therapy. There exists a critical therapy boundary which, in an exponent-decaying form, divides the parameter region of therapy into an invalid and a valid treatment zone, respectively. A greater critical therapy duty-cycle is necessary to achieve a valid treatment for a lower therapy intensity while the critical therapy intensity decreases accordingly with an enhancing immunity. A primary clinic observation of the patients with the typical non-hodgekin’s lymphoma was carried out, and there appears a basic agreement between clinic observations and dynamic simulations.
The growth dynamics of tumor subject to both immune surveillance and external therapy intervention
SHAO YuanZhi,ZHONG WeiRong,WANG FengHua,HE ZhenHui,XIA ZhongJun,
SHAO
,YuanZhi,ZHONG,WeiRong,WANG,FengHua,HE,ZhenHui,XIA,ZhongJun

科学通报(英文版) , 2007,
Abstract: Considering the growth of tumor cells modeled by an enzyme dynamic process under an immune surveillance, we studied in anti-tumor immunotherapy the single-variable growth dynamics of tumor cells subject to a multiplicative noise and an external therapy intervention simultaneously. The law of tumor growth of the above anti-tumor immunotherapy model was revealed through numerical simulations to the relevant stochastic dynamic differential equation. Two simulative parameters of therapy, i.e., therapy intensity and therapy duty-cycle, were introduced to characterize a treatment process similar to a tumor clinic therapy. There exists a critical therapy boundary which, in an exponent-decaying form, divides the parameter region of therapy into an invalid and a valid treatment zone, respectively. A greater critical therapy duty-cycle is necessary to achieve a valid treatment for a lower therapy intensity while the critical therapy intensity decreases accordingly with an enhancing immunity. A primary clinic observation of the patients with the typical non-hodgekin’s lymphoma was carried out, and there appears a basic agreement between clinic observations and dynamic simulations. Supported by the National Natural Science Foundation of China (Grant No. 60471023)
A Framework for Security-Enhanced Peer-to-Peer Applications in Mobile Cellular Networks  [PDF]
Shuping Liu, Shushan Zhao, Weirong Jiang
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.47055
Abstract: Due to the dual trends of increasing cellular network transmission capacity and coverage as well as improving computational capacity, storage and intelligence of mobile handsets, mobile peer-to-peer (MP2P) networking is emerging an attractive research field in recent years. However, these trends have not been clearly articulated in perspective of both technology and business. In this paper, we propose a novel MP2P framework that is based on existing cellular network architecture to provide secure and efficient P2P file sharing for 3G and future 4G systems. Our framework, which is built on P2P over Session Initiation Protocol (SIP) mechanism, provides to network operators and P2P service providers efficient data transmission in cellular networks. With a secure enhancement using identity-based cryptography, the framework also provides desirable support for security, group management, mobility, and chargeability to meet business requirements.
ENHANCEMENT OF CURIE TEMPERATURE OF THE INTERGRANULAR AMORPHOUS PHASE IN NANOCRYSTALLINE DUPLEX--PHASE ALLOYS
双相软磁合金晶间非晶相Curie温度的增强效应

ZHONG Weirong,SHAO Yuanzhi,LIN Guangming,HU Xiduo School of Physics Science,Engineering,Zhongshan University,Guangzhou,
钟伟荣
,邵元智,林光明,胡西多

金属学报 , 2004,
Abstract: 控制退火处理工艺使Fe73.5Cu1Nb3Si13.5B9非晶合金发生纳米晶化,获得不同晶粒尺度和晶相体积分数的非晶纳米晶双相组织状态.基于铁磁学严格Heisenberg自旋交换模型,构造适合非晶纳米晶双相结构要求的双相自旋团聚点阵.采用Monte Carlo模拟方法对上述双相自旋交换耦合点阵进行数值模拟计算.实验测定了经不同退火处理后双相Fe73.5Cu1Nb3Si13.5B9合金的纳米晶粒大小、纳米晶相所占体积分数以及晶间非晶相厚度对晶间非晶相Curie温度的影响.发现晶间非晶相Curie温度与其厚度的倒数成线性关系.模拟计算与实验测量结果相符.
Ocular Hypertension after Pediatric Cataract Surgery: Baseline Characteristics and First-Year Report
Haotian Lin, Weirong Chen, Lixia Luo, Xinyu Zhang, Jingjing Chen, Zhuoling Lin, Bo Qu, Jiao Zhan, Danying Zheng, Xiaojian Zhong, Zhen Tian, Yizhi Liu, for the Study Group of CCPMOH
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069867
Abstract: Monitoring intraocular pressure (IOP) is essential for pediatric cataract treatment but always difficult due to lack of cooperation in young children. We present the baseline characteristics and the first-year results of a long-term prospective cohort study, which are aimed to determine the relationship of the incidence of ocular hypertension (OH) in children after cataract surgery during the first-year period and the risk of developing late-onset glaucoma. Children were included with the following criteria: they were≤10 years old and scheduled to undergo cataract surgery with/without intraocular lens implantation; they were compliant with our follow-up protocol, which included monitoring IOP using a Tono-Pen under sedation or anesthesia. Incidence of OH, peak OH value, OH onset time and OH duration within a 12-month period following surgery were measured. In brief, 206 patients (379 eyes) were included and OH developed in 66 of 379 (17.4%) eyes. The mean follow-up period was 14.0±3.2 months (median, 12 months; range, 10–16 months). Moreover, 33 of 196 (16.8%) aphakic eyes and 33 of 183 (18.0%) IOL eyes were diagnosed with OH. The peak OH onset times were at 1-week (34/66, 51.5%) and 1-month (14/66, 21.2%) appointments postsurgery. The peak IOP value in the OH eyes was 29.9±7.5 mmHg (median, 29 mmHg; range, 21–48 mmHg). The duration of OH was 30.9±31.2 days (median, 30 days; range, 3–150 days). OH recurred in 13 eyes with a history of OH diagnosed within 1 month postsurgery (13/54, 24.1%), which needed temporary or long term use of antiglaucoma medications. In conclusion, the incidence of OH in children after cataract surgery was 17.4% during the first-year period. Children who have suffered elevated IOP in the first year after cataract surgery should be followed closely to determine if there is an increased risk of developing late-onset glaucoma.
Efficient Iterative Method for Solving the General Restricted Linear Equation  [PDF]
Xiaoji Liu, Weirong Du, Yaoming Yu, Yonghui Qin
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.62039
Abstract: An iterative method is developed for solving the solution of the general restricted linear equation. The convergence, stability, and error estimate are given. Numerical experiments are presented to demonstrate the efficiency and accuracy.
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