Present paper deals a M/M/1:(∞;GD) queueing model with interdependent controllable arrival and service rates where- in customers arrive in the system according to poisson distribution with two different arrivals rate...Present paper deals a M/M/1:(∞;GD) queueing model with interdependent controllable arrival and service rates where- in customers arrive in the system according to poisson distribution with two different arrivals rates-slower and faster as per controllable arrival policy. Keeping in view the general trend of interdependent arrival and service processes, it is presumed that random variables of arrival and service processes follow a bivariate poisson distribution and the server provides his services under general discipline of service rule in an infinitely large waiting space. In this paper, our central attention is to explore the probability generating functions using Rouche’s theorem in both cases of slower and faster arrival rates of the queueing model taken into consideration;which may be helpful for mathematicians and researchers for establishing significant performance measures of the model. Moreover, for the purpose of high-lighting the application aspect of our investigated result, very recently Maurya [1] has derived successfully the expected busy periods of the server in both cases of slower and faster arrival rates, which have also been presented by the end of this paper.展开更多
In mixed fisheries where there is an increased ecological interdependence between two or more target species, the possibilities of fishing these species must be determined jointly, since catches of one species will im...In mixed fisheries where there is an increased ecological interdependence between two or more target species, the possibilities of fishing these species must be determined jointly, since catches of one species will impact the natural growth not only of that species but of the others, as well. The objective of this paper is to develop a predator-prey model for two major species caught by the EU fishing fleet on European Union fishing grounds. The predator and prey’s population dynamics follow the Lotka-Volterra equation and are assumed to be logic-based, and a lineal interaction between the predator and prey populations is assumed. Optimal single owner multispecies fishery management is analysed, and the applied model is solved, obtaining the equilibrium value of biomasses, catches, and net benefits of the mixed fishery. The results show that the MSY of the predator is higher than that estimated by ICES, while MSY for prey is lower. The sensitivity analysis of the results reveals that the biomass levels of both species decrease as the discount rate increases, while catches increase.展开更多
目的:调查不孕症初诊夫妻的生育压力、二元应对和生育生活质量现状,探讨二元应对在生育压力与生育生活质量间的主客体互倚中介效应。方法:本研究为横断面研究设计,采取便利抽样法选取2023年9—11月本中心初诊不孕症、拟进行辅助生殖治疗...目的:调查不孕症初诊夫妻的生育压力、二元应对和生育生活质量现状,探讨二元应对在生育压力与生育生活质量间的主客体互倚中介效应。方法:本研究为横断面研究设计,采取便利抽样法选取2023年9—11月本中心初诊不孕症、拟进行辅助生殖治疗的267对夫妻为研究对象。采用一般资料调查表、生育压力量表(fertility problem inventory,FPI)、二元应对量表(dyadic coping inventory,DCI)和生育生活质量量表(fertility quality of life,FertiQoL)对不孕症夫妻的生育压力、二元应对和生育生活质量进行调查。采用SPSS 26.0软件对数据进行统计分析,运用R4.3.2软件进行主客体互倚中介效应分析。结果:共发放问卷不孕症夫妻267对,回收有效问卷257对,有效回收率为96.25%。Pearson相关分析显示,不孕症夫妻生育压力与二元应对、生育生活质量呈显著相关性(均P<0.001)。主体-主体效应中,二元应对在女方及男方的生育压力和生育生活质量间的主体中介效应均成立(β=-0.35,P<0.05和β=-0.09,P<0.05);伴侣-主体效应中,女方的生育压力能够通过影响男方的二元应对影响男方的生育生活质量(β=-0.04,P<0.05);男方的二元应对能够通过影响女方的二元应对影响女方的生育生活质量(β=0.06,P<0.05)。结论:不孕症夫妻在应对疾病过程中的行为反应是相互关联、相互影响的,临床诊治不孕症时在考虑一方生育压力的同时,还要考虑其自身及其与配偶之间的生育压力的相互影响,给予相应的干预措施提高双方的生育生活质量。展开更多
目的对使用主客体互倚模型(actor-partner interdependence model,APIM)探究癌症患者及家庭照顾者癌症复发恐惧(fear of cancer recurrence,FCR)影响因素主客体效应的现有证据进行系统化总结。方法以JBI范围综述指南为方法学框架,检索...目的对使用主客体互倚模型(actor-partner interdependence model,APIM)探究癌症患者及家庭照顾者癌症复发恐惧(fear of cancer recurrence,FCR)影响因素主客体效应的现有证据进行系统化总结。方法以JBI范围综述指南为方法学框架,检索中英文数据库中有关成人癌症患者及其家庭照顾者FCR影响因素主客体效应的研究。检索时限为建库至2023年1月1日。对纳入文献进行数据提取及汇总分析。结果纳入15篇研究,发现具有全部主客体效应的因素包括:双方年轻年龄、家庭回避癌症沟通、感恩、正念、抑郁。结论本综述纳入研究的研究对象、样本量、研究设计、研究工具方面仍需要进一步完善,现阶段的研究不足以支持上述因素的主客体效应,在未来的研究中需开展大样本、设计严谨的研究以确定影响癌症患者及家庭照顾者FCR的关键因素,从而进行有效二元干预。展开更多
文摘Present paper deals a M/M/1:(∞;GD) queueing model with interdependent controllable arrival and service rates where- in customers arrive in the system according to poisson distribution with two different arrivals rates-slower and faster as per controllable arrival policy. Keeping in view the general trend of interdependent arrival and service processes, it is presumed that random variables of arrival and service processes follow a bivariate poisson distribution and the server provides his services under general discipline of service rule in an infinitely large waiting space. In this paper, our central attention is to explore the probability generating functions using Rouche’s theorem in both cases of slower and faster arrival rates of the queueing model taken into consideration;which may be helpful for mathematicians and researchers for establishing significant performance measures of the model. Moreover, for the purpose of high-lighting the application aspect of our investigated result, very recently Maurya [1] has derived successfully the expected busy periods of the server in both cases of slower and faster arrival rates, which have also been presented by the end of this paper.
文摘In mixed fisheries where there is an increased ecological interdependence between two or more target species, the possibilities of fishing these species must be determined jointly, since catches of one species will impact the natural growth not only of that species but of the others, as well. The objective of this paper is to develop a predator-prey model for two major species caught by the EU fishing fleet on European Union fishing grounds. The predator and prey’s population dynamics follow the Lotka-Volterra equation and are assumed to be logic-based, and a lineal interaction between the predator and prey populations is assumed. Optimal single owner multispecies fishery management is analysed, and the applied model is solved, obtaining the equilibrium value of biomasses, catches, and net benefits of the mixed fishery. The results show that the MSY of the predator is higher than that estimated by ICES, while MSY for prey is lower. The sensitivity analysis of the results reveals that the biomass levels of both species decrease as the discount rate increases, while catches increase.
文摘目的:调查不孕症初诊夫妻的生育压力、二元应对和生育生活质量现状,探讨二元应对在生育压力与生育生活质量间的主客体互倚中介效应。方法:本研究为横断面研究设计,采取便利抽样法选取2023年9—11月本中心初诊不孕症、拟进行辅助生殖治疗的267对夫妻为研究对象。采用一般资料调查表、生育压力量表(fertility problem inventory,FPI)、二元应对量表(dyadic coping inventory,DCI)和生育生活质量量表(fertility quality of life,FertiQoL)对不孕症夫妻的生育压力、二元应对和生育生活质量进行调查。采用SPSS 26.0软件对数据进行统计分析,运用R4.3.2软件进行主客体互倚中介效应分析。结果:共发放问卷不孕症夫妻267对,回收有效问卷257对,有效回收率为96.25%。Pearson相关分析显示,不孕症夫妻生育压力与二元应对、生育生活质量呈显著相关性(均P<0.001)。主体-主体效应中,二元应对在女方及男方的生育压力和生育生活质量间的主体中介效应均成立(β=-0.35,P<0.05和β=-0.09,P<0.05);伴侣-主体效应中,女方的生育压力能够通过影响男方的二元应对影响男方的生育生活质量(β=-0.04,P<0.05);男方的二元应对能够通过影响女方的二元应对影响女方的生育生活质量(β=0.06,P<0.05)。结论:不孕症夫妻在应对疾病过程中的行为反应是相互关联、相互影响的,临床诊治不孕症时在考虑一方生育压力的同时,还要考虑其自身及其与配偶之间的生育压力的相互影响,给予相应的干预措施提高双方的生育生活质量。
文摘目的对使用主客体互倚模型(actor-partner interdependence model,APIM)探究癌症患者及家庭照顾者癌症复发恐惧(fear of cancer recurrence,FCR)影响因素主客体效应的现有证据进行系统化总结。方法以JBI范围综述指南为方法学框架,检索中英文数据库中有关成人癌症患者及其家庭照顾者FCR影响因素主客体效应的研究。检索时限为建库至2023年1月1日。对纳入文献进行数据提取及汇总分析。结果纳入15篇研究,发现具有全部主客体效应的因素包括:双方年轻年龄、家庭回避癌症沟通、感恩、正念、抑郁。结论本综述纳入研究的研究对象、样本量、研究设计、研究工具方面仍需要进一步完善,现阶段的研究不足以支持上述因素的主客体效应,在未来的研究中需开展大样本、设计严谨的研究以确定影响癌症患者及家庭照顾者FCR的关键因素,从而进行有效二元干预。
