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hh-transforms of Positivity Preserving Semigroups and Associated markov Processes

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Acta mathematica Sinica,English Series 2011年第2期27卷 369-376页

作者： Xin Fang HAN zhi-ming ma Wei SUN School of mathematical Science and Computing Technology Central South University Changsha 410083 P. R. China Institute of Applied mathematics AMSS Chinese Academy of Sciences Beijing 100190 P. R. China Department of mathematics and Statistics Concordia University Montreal H3G 1M8 Canada

The hh-transforms of positivity preserving semigroups and their associated markov processes are investigated in this paper. In particular, it is shown that any quasi-regular positivity preserving coercive form is hh-a... 详细信息

关键词： hh-transform positivity preserving semigroup positivity preserving coercive form markov process weak duality

Structural Investigation of Solid Methane at High Pressure

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Chinese Physics Letters 2010年第6期27卷 141-143页

作者： ZHAO Juan FENG Wan-Xiang LIU zhi-ming ma Yan-ming HE zhi CUI Tian ZOU Guang-Tian State Key Lab of Superhaxd materials College of Physics Jilin University Changchun 130012

High pressure studies of solid methane are performed using both classical simulated annealing and first-principles methods. A series of simulated annealing and geometry optimization reveal a monoclinic P21/b structure with the unit cell containing four methane molecules. The phonon dispersion curves and vibrational density of states indicate that this structure is stable in the pressure range 10-90 GPa. The electronic band structure and density of states show that this structure has not metalized until 90 GPa.

关键词： Pressure Methane Simulation Lymphocytes Dispersants Density

The Properties Analysis for Generalized Abstract Evolutionary Algorithm

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Chinese Quarterly Journal of mathematics 2006年第2期21卷 255-260页

作者： XUE ming-zhi ma Yun-ling Department of mathematics Shangqiu Normal College Shangqiu 476000 China

There has been a growing interest in mathematical models to character the evolutionary algorithms. The best-known one of such models is the axiomatic model called the abstract evolutionary algorithm （AEA）, which unifies most of the currently known evolutionary algorithms and describes the evolution as an abstract stochastic process composed of two fundamental abstract operators： abstract selection and evolution operators. In this paper, we first introduce the definitions of the generalized abstract selection and evolution operators. Then we discuss the characterization of some parameters related to generalized abstract selection and evolution operators. Based on these operators, we finally give the strong convergence of the generalized abstract evolutionary algorithm. The present work provides a big step toward the establishment of a unified theory of evolutionary computation.

关键词： selection operators evolution operators evolutionary algorithm strong convergence

Tumour length is an independent prognostic factor of esophageal squamous cell carcinomas

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Chinese Medical Journal 2012年第24期125卷 4445-4448页

作者： WU Ning PANG Lie-wen CHEN zhi-ming ma Qin-yun CHEN Gang Department of Cardiothoracic Surgery Huashan Hospital Fudan University Shanghai 200040 China

Background The latest version of the American Joint Committee on Cancer （AJCC） TNM staging system has not comprehensively evaluated the impact of tumour length on survival in patients with esophageal squamous cell carcinoma. Our study explored the relationship between tumour length and clinicopathological characteristics as well as long-term survival. Methods All 202 cases of esophageal resections done from January 1, 2004 to December 31, 2008 in Huashan Hospital, Fudan University were reviewed and followed up. Results Patients with tumour length 〉3 cm were related to more advanced tumour stage （χ2=55.9, P 〈0.001）, more metastatic lymph nodes （χ2=14.6, P 〈0.001）, increased metastatic lymph node ratio （χ2=16.1, P 〈0.001） and worse overall TNM stage （χ2=48.1, P 〈0.001）. Univariate and multivariate analyses indicated that tumour length was a significant prognostic risk factor （95% CI 0.235-0.947, P=-0.035）. Subgroup analyses disclosed that tumour length was a valuable prognostic predictor in patients with lower T stage, absence of metastatic lymph nodes and lower TNM stage. Conclusions Esophageal tumour length is a predictive factor for long-term survival especially for lower tumour stage, absence of metastatic lymph nodes and lower TNM stage patients. Tumour length should be incorporated in the staging system as an important grouping factor for better prognostic evaluation.

关键词： esophageal squamous cell carcinoma tumour length prognosis

Thirty-one patients with primary hepatocellular carcinoma survived for more than 5 years after hepatectomy

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Hepatobiliary & Pancreatic Diseases International 2002年第2期1卷 191-193页

作者： Dong-Hui Zhou Yi-Zhen Feng Wen-He Zhao zhi-ming ma From the Department of Oncology, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China Department of Oncology First Affiliated Hospital Zhejiang University School of Medicine Hangzhou 310003 China.

Objective: To investigate the factors affecting progno- sis of patients with primary hepatocellular carcinoma (PHC) after resection. Methods: From 1976 to 1992, 213 patients with PHC treated with hepatectomy were followed up for more than 5 years. Thirty-one of the patients who had sur- vived for more than 5 years were compared with 56 patients who had survived for less than 5 years. Results: Early detection of tumor, radical resection, number of tumors, capsule formation, operation safe distance, presence of portal tumor embolus, pre- sence of cirrhosis and tumor size were important fac- tors affecting the prognosis of patients with PHC. The proportion of small liver cancer in the patients who had survived for more than 5 years was greatly larger than that in the control group. Conclusions: Early detection of tumor and radical re- section are of value in raising the 5-year survival rate. Much remains to be investigated about the rela- tionship between safe margin distance and prognosis of patients with PHC.

关键词： primary hepatocellular carcinoma surgery prognosis 5-year survival rate

Random Networks and Graph valued markov Processes

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Random Networks and Graph valued Markov Processes

第二届全国复杂动态网络学术论坛

作者： zhi-ming ma Inst. Appl. math., Academy of math and System Sciences, CAS

＜正＞Networks appear in various systems of the *** mathematical point of view a network is a graph consisting of vertices （nodes） connected by edges （links）. Recently there has been an increasing interest on the complex random networks with power law degree distributions and other *** of the empirical and theoretical models of random networks studied uo to date can be viewed as markov processes with state spaces consisting of graphs.

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中国大陆6级以上强震前的地震应变场研究

地球物理学报 2017年第10期60卷 3804-3814页

作者：杨明芝马禾青罗国富许晓庆宁夏地震局银川750001

以地震应变场作为地震活动的变量,通过自然正交函数展开方法,计算了中国大陆6级以上强震前的地震应变场,提取出震前时间因子的异常变化.计算结果分析发现大地震前时间因子在平稳背景上会出现突跳上升或突跳下降变化,且震前地震应变场前... 详细信息

以地震应变场作为地震活动的变量,通过自然正交函数展开方法,计算了中国大陆6级以上强震前的地震应变场,提取出震前时间因子的异常变化.计算结果分析发现大地震前时间因子在平稳背景上会出现突跳上升或突跳下降变化,且震前地震应变场前4个典型场中至少有3个典型场会出现异常变化,具有多分量显示异常的特点,而异常出现的最早时间大约在震前3年,并且一些地震前出现短临的时间因子异常变化特征.通过震例研究表明用地震应变场分析地震活动异常,提取的时间因子异常结果比应用地震能量场更具有独特的优越性,并讨论了应变场与能量场的差异.

关键词：地震应变场地震能量场自然正交函数展开方法时间因子

Unlocking the future:Mitochondrial genes and neural networks in predicting ovarian cancer prognosis and immunotherapy response

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World Journal of Clinical Oncology 2025年第1期16卷 43-52页

作者： zhi-Jian Tang Yuan-ming Pan Wei Li Rui-Qiong ma Jian-Liu Wang Department of Obstetrics and Gynecology Peking University People’s HospitalBeijing 100044China Cancer Research Center Beijing Chest HospitalBeijing 101149China Department of Thoracic Surgery Sichuan Provincial People's HospitalChengdu 610072Sichuan ProvinceChina

BACKGROUND Mitochondrial genes are involved in tumor metabolism in ovarian cancer(OC)and affect immune cell infiltration and treatment *** To predict prognosis and immunotherapy response in patients diagnosed with OC using mitochondrial genes and neural *** Prognosis,immunotherapy efficacy,and next-generation sequencing data of patients with OC were downloaded from The Cancer Genome Atlas and Gene Expression *** genes were sourced from the MitoCarta3.0 *** discovery cohort for model construction was created from 70% of the patients,whereas the remaining 30% constituted the validation *** the expression of mitochondrial genes as the predictor variable and based on neural network algorithm,the overall survival time and immunotherapy efficacy(complete or partial response)of patients were *** In total,375 patients with OC were included to construct the prognostic model,and 26 patients were included to construct the immune efficacy *** average area under the receiver operating characteristic curve of the prognostic model was 0.7268[95% confidence interval(CI):0.7258-0.7278]in the discovery cohort and 0.6475(95%CI:0.6466-0.6484)in the validation *** average area under the receiver operating characteristic curve of the immunotherapy efficacy model was 0.9444(95%CI:0.8333-1.0000)in the discovery cohort and 0.9167(95%CI:0.6667-1.0000)in the validation *** The application of mitochondrial genes and neural networks has the potential to predict prognosis and immunotherapy response in patients with OC,providing valuable insights into personalized treatment strategies.

关键词： Ovarian cancer Mitochondria Prognosis Immunotherapy Neural network

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路段上游直线式公交站点对车辆延误影响分析

北京理工大学学报 2017年第3期37卷 267-273页

作者：梁士栋赵淑芝马明辉刘华胜卢春秀吉林大学交通学院吉林长春130022

针对公交车在直线式公交站点停靠时对车辆运行效率影响问题,利用交通波理论对交通流稳定输入下路段上游直线式公交站点对车辆延误影响分析,将延误分为在公交站点受公交车停靠阻滞产生的延误及受到公交车停靠影响的车辆在交叉口处产生的... 详细信息

针对公交车在直线式公交站点停靠时对车辆运行效率影响问题,利用交通波理论对交通流稳定输入下路段上游直线式公交站点对车辆延误影响分析,将延误分为在公交站点受公交车停靠阻滞产生的延误及受到公交车停靠影响的车辆在交叉口处产生的延误,并利用交通波理论分别对不受公交车停靠影响的车辆延误及受到影响的车辆延误计算模型构建,进而得到公交车停靠引起车辆延误变化即车辆附加延误.最后对所提出的延误模型数值分析,分别得到交叉口信号周期、绿信比、交通流量及公交车停靠时间对车辆延误影响.结果表明,随着绿信比、信号周期减小和交通流量、公交车停靠时间增加,车辆附加延误呈上升趋势,其中公交车停靠时间和交通流量对附加延误影响较大.

关键词：公交站点车辆附加延误信号交叉口交通波理论车辆延误