检索结果-南通市图书馆

Optimal Timing of Business Conversion for Solvency Improvement

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年第3期40卷 744-757页

作者： Peng LI Ming ZHOU School of Finance Nanjing University of Finance and EconomicsNanjing 210023China center for Applied statistics and School of statistics Renmin University of ChinaBeijing 100872China

In this paper,we study the optimal timing to convert the risk of business for an insurance company in order to improve its *** cash flow of company evolves according to a jump-diffusion *** conversion option offers the company an opportunity to transfer the jump risk business *** exchange for this option,the company needs to pay both fixed and proportional transaction *** proportional cost can also be seen as the profit loading of the jump risk *** formulated this problem as an optimal stopping *** solving this stopping problem,we find that the optimal timing of business conversion mainly depends on the profit loading of the jump risk business.A larger profit loading would make the conversion option *** fixed cost,however,only delays the optimal timing of business *** the end,numerical results are provided to illustrate the impacts of transaction costs and environmental parameters to the optimal strategies.

关键词： optimal stopping jump-diffusion process conversion option

Aubry-Mather theory for contact Hamiltonian systems Ⅲ

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2024年第11期67卷 2541-2570页

作者： Panrui Ni Lin Wang Shanghai center for Mathematical Sciences Fudan University School of Mathematics and statistics Beijing Institute of Technology

By exploiting the contact Hamiltonian dynamics（T*M × R,Φ_t） around the Aubry set of contact Hamiltonian systems,we provide a relation among the Mather set,the Φ_t-recurrent set,the strongly static set,the Aubry set,the Ma?é set,and the Φ_t-non-wandering ***,we consider the strongly static set,as a new flow-invariant set between the Mather set and the Aubry set in the strictly increasing *** show that this set plays an essential role in the representation of certain minimal forward weak Kolmogorov-Arnold-Moser（KAM） solutions and the existence of transitive orbits around the Aubry set.

关键词： Aubry-Mather theory weak KAM theory contact Hamiltonian systems Hamilton-Jacobi equations

Cancer epidemiological database linkage study of China: Design, methods, and quality evaluation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中华医学杂志(英文版) 2024年第17期137卷 2122-2124页

作者： Zang Zhaoping Sun Kexin Zhang Mei Zheng Rongshou Zhao Yanfang Zhang Siwei Zhang Xiao Wang Shaoming Wang Xiaoxu Chang Sheng Liu Fen Wang Limin Wei Wenqiang Department of Epidemiology and Health statistics School of Public Health Beijing Municipal Key Laboratory of Clinical Epidemiology Capital Medical University Beijing China National Central Cancer Registry National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China National center for Chronic and Non-Communicable Disease Control and Prevention Chinese Center for Disease Control and Prevention Beijing China center for Health statistics and Information of National Health Commission Beijing China Human Resources Office National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China

A fiducial approach to the nonparametric deconvolution problem:The discrete case

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2024年第11期67卷 2653-2670页

作者： Yifan Cui Jan Hannig center for Data Science Zhejiang University Department of statistics and Operations Research University of North Carolina at Chapel Hill

Fiducial inference is applied to nonparametric g-modeling in the discrete *** propose a computationally efficient algorithm to sample from the fiducial distribution and use the generated samples to construct point estimates and confidence *** study the theoretical properties of the fiducial distribution and perform extensive simulations in various *** proposed approach gives rise to good statistical performance in terms of the mean squared error of point estimators and coverage of confidence ***,we apply the proposed fiducial method to estimate the probability of each satellite site being malignant using gastric adenocarcinoma data with 844 patients.

关键词： confidence intervals empirical Bayes fiducial inference nonparametric deconvolution

同方期刊数据库

Infinitely many dichotomous solutions for the Schrödinger-Poisson system

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2024年第9期67卷 2049-2070页

作者： Yuke He Benniao Li Wei Long School of Mathematics and statistics and Jiangxi Provincial center for Applied Mathematics Jiangxi Normal UniversityNanchang 330022China

In this paper,we consider the following Schrodinger-Poisson system{-ε^(2)Δu+V(x)u+K(x)Φ(x)u=|u|^(p-1)u in R^(N),-ΔΦ(x)=K(x)u^(2)in RN,,where e is a small parameter,1 详细信息

In this paper,we consider the following Schrodinger-Poisson system{-ε^(2)Δu+V(x)u+K(x)Φ(x)u=|u|^(p-1)u in R^(N),-ΔΦ(x)=K(x)u^(2)in RN,,where e is a small parameter,1

关键词： dichotomous solutions non-degeneracy Schrodinger-Poisson system

Respiratory complications of propofol, sevoflurane, and dexmedetomidine anesthesia for fiberoptic bronchoscopy in children aged 1 month to 3 years: a randomized trial

在线全文

学校读者我要写书评

暂无评论

南方医科大学学报 2024年

作者： Amir Shafa Mohammad Montasery Sedighe Shahhosseini Majid Keivanfar Asieh Maghami Mehr Mahtab Ebrahim Babaei Mohammad Jafari Department of Anesthesiology Anesthesiology and Critical Care Research center Department of Pediatrics Isfahan University of Medical Sciences Department of statistics Yazd University Departments of Obstetrics and Gynecology Shahrekord University of Medical Sciences

Objective To evaluate the effect of propofol, sevoflurane, and dexmedetomidine on respiratory complications in children undergoing fiberoptic bronchoscopy(FOB). Methods This double-blind randomized clinical trial was conducted among 120 children aged 1 month to 3 years undergoing FOB. The patients were randomized into 3 groups(n=40) for anesthesia induction with sevoflurane inhalation, 1 mg/kg propofol, or 1 μg/kg dexmedetomidine before bronchoscopy, and the changes in hemodynamic parameters, sedation level, and respiratory complications during and after the procedure were assessed. Results The patients' heart rate during bronchoscopy was significantly lower and the mean arterial blood pressure significantly higher in dexmedetomidine group than in sevoflurane and propofol groups(P<0.05). Cough during bronchoscopy did not occur in any of the cases in propofol group, while the highest frequency of cough was recorded in dexmedetomidine group. The incidence of laryngospasm in the propofol group(12.5%) was significantly lower than those in sevoflurane and dexmedetomidine groups(30% and 32.5%, respectively)(P<0.05). Conclusion Sevoflurane and propofol are safe and suitable for anesthesia induction in children below 3 years of age undergoing diagnostic FOB and can achieve better sedative effect and lower the incidences of cough and respiratory complications as compared with dexmedetomidine.

关键词：

Respiratory complications of propofol,sevoflurane,and dexmedetomidine anesthesia for fiberoptic bronchoscopy in children aged 1 month to 3 years:a randomized trial

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

南方医科大学学报 2024年第9期44卷 1631-1636页

作者： Amir Shafa Mohammad Montasery Sedighe Shahhosseini Majid Keivanfar Asieh Maghami Mehr Mahtab Ebrahim Babaei Mohammad Jafari Department of Anesthesiology Anesthesiology and Critical Care Research center Department of Pediatrics Isfahan University of Medical SciencesIsfahanIran Department of statistics Yazd UniversityYazdIran Departments of Obstetrics and Gynecology Shahrekord University of Medical SciencesShahrekordIran

Objective To evaluate the effect of propofol,sevoflurane,and dexmedetomidine on respiratory complications inchildren undergoing fiberoptic bronchoscopy(FOB).Methods This double-blind randomized clinical trial was conductedamong 120 children aged 1 month to 3 years undergoing *** patients were randomized into 3 groups(n=40)foranesthesia induction with sevoflurane inhalation,1 mg/kg propofol,or 1μg/kg dexmedetomidine before bronchoscopy,andthe changes in hemodynamic parameters,sedation level,and respiratory complications during and after the procedure *** The patients'heart rate during bronchoscopy was significantly lower and the mean arterial blood pressuresignificantly higher in dexmedetomidine group than in sevoflurane and propofol groups(P<0.05).Cough duringbronchoscopy did not occur in any of the cases in propofol group,while the highest frequency of cough was recorded indexmedetomidine *** incidence of laryngospasm in the propofol group(12.5%)was significantly lower than those insevoflurane and dexmedetomidine groups(30%and 32.5%,respectively)(P<0.05).Conclusion Sevoflurane and propofol aresafe and suitable for anesthesia induction in children below 3 years of age undergoing diagnostic FOB and can achieve bettersedative effect and lower the incidences of cough and respiratory complications as compared with dexmedetomidine.

关键词： fiberoptic bronchoscopy propofol sevoflurane dexmedetomidine children

First Passage Density of Brownian Motion with Two-sided Piecewise Linear Boundaries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2024年第6期40卷 1505-1520页

作者： Zhen YU Mao Zai TIAN center for Applied statistics School of StatisticsRenmin University of ChinaBeijing 100872P.R.China School of Mathematics and Data Science Changji UniversityChangji 831100P.R.China

The first passage time has many applications in fields like finance,econometrics,statistics,and ***,explicit formulas for the first passage density have only been obtained for a few *** paper derives an explicit formula for the first passage density of Brownian motion with twosided piecewise continuous boundaries which may have some points of *** are used to obtain a simplified formula for estimating the first passage ***,the results are also generalized to the case of two-sided general nonlinear *** can be easily carried out with Monte Carlo method and it is demonstrated for several typical two-sided boundaries that the proposed approximation method offers a highly accurate approximation of first passage density.

关键词： Boundary non-crossing probability first density passage density two-sided piecewise continuous boundaries Brownian motion

Efficacy of a Nutritional Cream Intervention to Treat Depression in Rescuers:A Randomized Controlled Trial

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2024年第7期37卷 754-761页

作者： Qiao Wang Hengyu Luan Chunyan Li Rufang Gong Qiongxuan Li Jiayi Deng Xiaoyong Sai Department of statistics and Epidemiology The Graduate School of the Chinese PLA General HospitalBeijing 100853China Comprehensive Internal Medicine Western Medical Branch of PLA General HospitalBeijing 100144China Department of Respiratory The First Medical Center of PLA General HospitalBeijing 100853China Department of Pharmacy Intravenous Admixture Services(PIVAS) The First Medical Center of PLA General HospitalBeijing 100853China

Objective To explore the effectiveness of a nutritional intervention in rescuers who screened positive for *** A randomized controlled trial design was *** June to August,2022,4,460 rescuers were screened using the Self-Rating Depression Scale(SDS),and 1,615 positive cases were ***-one volunteers were recruited and randomly divided into a nutritional intervention group and a control *** intervention group received health education and nutritional intervention(a compound paste therapy primarily composed of red roses and Seville orange flowers),while the control group received psychological *** scores were assessed before and after the *** There was a statistically significant decline in SDS scores in the nutritional intervention group after the intervention(P<0.05).Furthermore,the SDS scores of the intervention group were significantly lower than those of the control group,both before and after the intervention(P<0.05).No severe adverse reactions were observed during safety *** The nutritional intervention effectively reduced the depression scores in *** nutritional intervention is recommended for rescuers who initially screen positive for depression.

关键词： Nutritional intervention Rescuers Depression Randomized controlled trial