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具有工作量D-策略不可靠修理设备和不中断休假的M^(λ_(1),λ_(2))=G=1排队的可靠性 被引量:1
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作者 刘琼琳 唐应辉 何亚兴 《应用数学》 北大核心 2023年第2期504-516,共13页
本文研究在基于服务员工作量的D-策略控制下具有可变到达率和不中断单重休假M^(λ_(1),λ_(2))/G/1可修排队模型,其中修理设备在修理故障服务台期间可发生失效且可更换.当服务员休假结束归来时,如果服务员对系统中等待服务的顾客所需服... 本文研究在基于服务员工作量的D-策略控制下具有可变到达率和不中断单重休假M^(λ_(1),λ_(2))/G/1可修排队模型,其中修理设备在修理故障服务台期间可发生失效且可更换.当服务员休假结束归来时,如果服务员对系统中等待服务的顾客所需服务的总工作量不小于事先设置的工作量阀值D(D≥0),服务员就立即开始服务.运用更新过程理论、全概率分解技术和拉普拉斯变换工具,分别讨论了服务台和修理设备的瞬态不可用度和稳态不可用度、(0,t]时间内的平均故障次数和稳态故障频度这一系列可靠性指标. 展开更多
关键词 基于服务员工作量的D-策略 不中断单重休假 可变到达率 全概率分解技术 可靠性指标
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在D-策略控制下服务员单重休假且休假不中断的M/G/1排队系统分析 被引量:2
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作者 刘琼琳 唐应辉 《数学物理学报(A辑)》 CSCD 北大核心 2021年第1期269-288,共20页
该文研究在D-策略控制下服务员单重休假且休假不中断的M/G/1排队系统,其中当服务员休假结束归来时,如果系统中等待服务的顾客所需的总服务时间之和不小于事先给定的正数阀值D,服务员就立即开始服务.运用全概率分解技术、更新过程理论和... 该文研究在D-策略控制下服务员单重休假且休假不中断的M/G/1排队系统,其中当服务员休假结束归来时,如果系统中等待服务的顾客所需的总服务时间之和不小于事先给定的正数阀值D,服务员就立即开始服务.运用全概率分解技术、更新过程理论和拉普拉斯变换工具,本文在任意初始状态下讨论了队长的瞬态分布,导出了队长瞬态分布的拉普拉斯变换的表达式和稳态队长分布的递推表达式.同时给出了稳态队长的随机分解结构、附加队长分布的显示表达式.进一步借用稳态队长分布{pj,j=0,1,2,⋯},讨论了系统容量的优化设计,并阐述了稳态队长分布对系统容量优化设计所起的重要作用.最后,在建立费用模型的基础上,导出了系统在长期单位时间内期望费用的显示表达式,并通过数值实例不仅确定了使系统在长期单位时间内的期望费用最小的控制策略D∗,而且还得到了当休假时间长度为固定时长T(>0)时系统的联合控制策略(T∗,D∗). 展开更多
关键词 D-策略 单重休假且休假不中断 全概率分解技术 系统容量设计 最优控制策略
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Modern Hotel Buildings in Guangzhou
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作者 liu qionglin CHENG Jianjun CHEN Jun 《Journal of Landscape Research》 2016年第1期1-4,共4页
Hotel buildings as important components of modern commercial buildings in Guangzhou City were originated from foreign hotel buildings, and urged the transition of national hotels to western advanced hotel buildings by... Hotel buildings as important components of modern commercial buildings in Guangzhou City were originated from foreign hotel buildings, and urged the transition of national hotels to western advanced hotel buildings by applying western architectural styles, architectural science and management. This paper sorted out the development history of modern hotel buildings in Guangzhou City, summarized the features to provide references for the development of modern hotel buildings and protection and research of antique hotel buildings in Guangzhou. 展开更多
关键词 Guangzhou modern hotels Commercial building the Victoria Hotel Shameen East Asia Hotel the Oi Kwan Mansion(or Aiqun Hotel)
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Upper mantle anisotropy and crust-mantle deformation pattern beneath the Chinese mainland 被引量:21
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作者 WANG ChunYong CHANG LiJun +3 位作者 DING ZhiFeng liu qionglin LIAO WuLin Lucy M FLESCH 《Science China Earth Sciences》 SCIE EI CAS 2014年第1期132-143,共12页
Over the past 10 years, the number of broadband seismic stations in China has increased significantly. The broadband seismic records contain information about shear-wave splitting which plays an important role in reve... Over the past 10 years, the number of broadband seismic stations in China has increased significantly. The broadband seismic records contain information about shear-wave splitting which plays an important role in revealing the upper mantle anisotropy in the Chinese mainland. Based on teleseismic SKS and SKKS phases recorded in the seismic stations, we used the analytical method of minimum transverse energy to determine the fast wave polarization direction and delay time of shear-wave splitting. We also collected results of shear-wave splitting in China and the surrounding regions from previously published papers. From the combined dataset we formed a shear-wave splitting dataset containing 1020 parameter pairs. These splitting parameters re- veal the complexity of the upper mantle anisotropy image. Our statistical analysis indicates stronger upper mantle anisotropy in the Chinese mainland, with an average shear-wave time delay of 0,95 s; the anisotropy in the western region is slightly larger (1.01 s) than in the eastern region (0.92 s). On a larger scale, the SKS splitting and surface deformation data in the Tibetan Plateau and the Tianshan region jointly support the lithospheric deformation mode, i.e. the crust-lithospheric mantle coherent deformation. In eastern China, the average fast-wave direction is approximately parallel to the direction of the absolute plate motion; thus, the upper mantle anisotropy can be attributed to the asthenospheric flow. The area from the Ordos block to the Sichuan Basin in central China is the transition zone of deformation modes between the east and the west regions, where the anisotropy images are more complicated, exhibiting "fossil" anisotropy and/or two-layer anis^3trc^py. The c^llisi(3n between the Indian Plate and the Eurasian Plate is the main factor of upper mantle anisotropy in the western region of the Chinese mainland, while the upper mantle anisotropy in the eastern region is related to the subduction of the Pacific Plate and the Philippine Sea Plate beneath the Eurasian Plate. 展开更多
关键词 shear-wave splitting upper mantle anisotropy lithosphere deformation asthenospheric flow absolute plate motion
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内耳型偏头痛:前庭性偏头痛与耳蜗性偏头痛 被引量:11
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作者 赖仁淙 刘琼临 《临床耳鼻咽喉头颈外科杂志》 CAS 北大核心 2019年第3期200-203,共4页
内耳型偏头痛,包括前庭性偏头痛(vestibular migraine,VM)与新提出的耳蜗性偏头痛(cochlear migraine,CM)[1],是指一类与偏头痛相关的眩晕、耳鸣、耳聋疾病。偏头痛与眩晕、耳鸣、耳聋等症状像是一群'共犯结构',有时全体出动有... 内耳型偏头痛,包括前庭性偏头痛(vestibular migraine,VM)与新提出的耳蜗性偏头痛(cochlear migraine,CM)[1],是指一类与偏头痛相关的眩晕、耳鸣、耳聋疾病。偏头痛与眩晕、耳鸣、耳聋等症状像是一群'共犯结构',有时全体出动有时两两结队出现,而更多时候是单打独斗。内耳型偏头痛大部分发作时并不头痛,还有一部分的患者很少头痛,造成临床诊断上的困难。眩晕和耳鸣、耳聋等可以是内耳型偏头痛发作的唯一症状,多数人发作即是这种'不头痛类型'。 展开更多
关键词 内耳型偏头痛 耳蜗性偏头痛 突发性 眩晕 耳鸣
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