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Application Server Aging Model and Multi-Level Rejuvenation Strategy Using Semi-Markov Process

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Wuhan University Journal of Natural Sciences 2006年第5期11卷 1209-1215页

作者： zhao tianhai QI Yong SHEN Junyi HOU Di ZHENG Xiaomei LIU Liang School of Electronics and Information Engineering Xi＇an Jiaotong University Xi＇an 710049 Shaanxi China IBM China Research Laboratory Beijing 100094China

Aiming at the characteristic of the dependency between the application components and the application server platform, a rejuvenation strategy with two different levels of rejuvenation granularities is put forward in this paper including the application component reiuvenation and the application server system rejuvenation. The availability and maintenance cost functions are obtained by means of establishing the application server aging model and the boundary condition of the optimal rejuvenation time is analyzed. Theory analysis indicates that the two-level rejuvenation strategy is superior to the traditional single level one. Finally, evaluation experiments are carried out and numerical result shows that compared with the traditional rejuvenation policy, the rejuvenation strategy proposed in this paper can further increase availability of the application server and reduce maintenance cost.

关键词： application server software rejuvenation reliability software maintenance

The Optimal Rejuvenation Schedule Driven by Maintenance Cost in Application Server

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通讯和计算机（中英文版） 2006年第8期3卷 76-81页

作者： tianhai zhao Yong Qi Junyi Shen Di Hou Xiaomei Zheng School of Electronics and Information Engineering Xi＇ an Jiaotong University Xi＇an 710049 China

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基于JNDI的高可靠命名服务的研究

计算机工程 2006年第6期32卷 44-46,78页

作者：赵天海沈钧毅齐勇蒋涛西安交通大学软件所西安710049

分布式系统中命名服务被广泛用于获得资源引用、远程对象引用等方面,但是同时也带来了新的问题,命名服务的可靠性、可用性和性能问题直接影响分布式系统正常运行。该文针对这些问题的研究分为3个部分,首先深入研究了现有的命名服务系统... 详细信息

分布式系统中命名服务被广泛用于获得资源引用、远程对象引用等方面,但是同时也带来了新的问题,命名服务的可靠性、可用性和性能问题直接影响分布式系统正常运行。该文针对这些问题的研究分为3个部分,首先深入研究了现有的命名服务系统,并在此基础上分析了JNDI的核心构架以及实现方式,然后提出了高可靠命名服务模型,扩展JNDI框架,重构JNDI命名服务,提出新的JNDI集群算法,最后实现了本系统,其实验结果优于原有JNDI服务。

关键词：命名服务 JNDI 高可靠性

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基于关联对象组的业务组件请求分配算法

西安交通大学学报 2006年第2期40卷 152-156页

作者：赵天海齐勇沈钧毅郑晓梅西安交通大学电子与信息工程学院西安710049

针对企业Java业务组件(EJB)的负载请求特点,提出了基于关联对象组的EJB负载分配算法(ROGRD).该算法对集群环境下的EJB资源创建情况进行划分,并根据划分的集合在排队论系统模型的基础上建立了代价函数和回报函数,然后依据不同的请求类型... 详细信息

针对企业Java业务组件(EJB)的负载请求特点,提出了基于关联对象组的EJB负载分配算法(ROGRD).该算法对集群环境下的EJB资源创建情况进行划分,并根据划分的集合在排队论系统模型的基础上建立了代价函数和回报函数,然后依据不同的请求类型,且在请求内容的分布,服务器的负载状况以及服务器的处理性能的衰减3个约束条件下,获得代价最小而回报最大分配方案.实验结果表明,ROGRD比基于位置的请求分配算法的响应时间减少了11%,吞吐量提高了28.5%.

关键词：企业Java组件请求分配算法关联对象组

Dietary supplementation with xylooligosaccharides and exogenous enzyme improves milk production,energy utilization efficiency and reduces enteric methane emissions of Jersey cows

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Journal of Animal Science and Biotechnology 2023年第6期14卷 2514-2524页

作者： Lifeng Dong Lei zhao Bowei Li Yanhua Gao tianhai Yan Peter Lund Zhuofan Liu Qiyu Diao Institute of Feed Research/Sino‑US Joint Lab On Nutrition and Metabolism of Ruminant Chinese Academy of Agricultural SciencesBeijing 100081China. School of Agriculture Ningxia UniversityYinchuan 750000China. College of Life Science and Technology Southwest Minzu UniversityChengdu 610041China. Agri-Food and Biosciences Institute Hillsborough Co.Down BT 266DRUK. Department of Animal Science Aarhus UniversityAU FoulumPO Box 508830 TjeleDenmark.

Background Sustainable strategies for enteric methane(CH_(4))mitigation of dairy cows have been extensively explored to improve production performance and alleviate environmental *** present study aimed to investigate the effects of dietary xylooligosaccharides(XOS)and exogenous enzyme(EXE)supplementation on milk production,nutrient digestibility,enteric CH_(4) emissions,energy utilization efficiency of lactating Jersey dairy ***-eight lactating cows were randomly assigned to one of 4 treatments:(1)control diet(CON),(2)CON with 25 g/d XOS(XOS),(3)CON with 15 g/d EXE(EXE),and(4)CON with 25 g/d XOS and 15 g/d EXE(XOS+EXE).The 60-d experimental period consisted of a 14-d adaptation period and a 46-d sampling *** enteric CO_(2)and CH_(4) emissions and O2 consumption were measured using two GreenFeed units,which were further used to determine the energy utilization efficiency of *** Compared with CON,cows fed XOS,EXE or XOS+EXE significantly(P<0.05)increased milk yield,true protein and fat concentration,and energy-corrected milk yield(ECM)/DM intake,which could be reflected by the significant improvement(P<0.05)of dietary NDF and ADF *** results showed that dietary supplementation of XOS,EXE or XOS+EXE significantly(P<0.05)reduced CH_(4) emission,CH_(4)/milk yield,and CH_(4)/***,cows fed XOS demonstrated highest(P<0.05)metabolizable energy intake,milk energy output but lowest(P<0.05)of CH_(4) energy output and CH_(4) energy output as a proportion of gross energy intake compared with the remaining *** Dietary supplementary of XOS,EXE or combination of XOS and EXE contributed to the improvement of lactation performance,nutrient digestibility,and energy utilization efficiency,as well as reduction of enteric CH_(4) emissions of lactating Jersey *** promising mitigation method may need further research to validate its long-term effect and mode of action for dairy cows.

关键词： Energy utilization efficiency Enteric methane emissions Exogenous enzyme Jersey cows Xylooligosaccharides

Active Disturbance Rejection Controller Based Heading Control of Underwater Flight Vehicles

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Journal of Shanghai Jiaotong university(Science) 2020年第4期25卷 441-446页

作者： ZHENG tianhai FENG Zhengping zhao Shuo PAN Wanjun School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration Shanghai Jiao Tong UniversityShanghai 200240China

The total disturbance estimated by the extended state observer(ESO)in active disturbance rejection controller(ADRC)is affected greatly by measurement noise when the control step is small in heading control of underwater flight vehicles(UFVs).In order to prevent rudder from high-frequency chattering caused by measurement noise,a tracking-differentiator(TD)is integrated to the ESO to develop an improved ADRC *** improved ADRC suppresses the impact of sensor *** the results of simulations and tank tests show the effectiveness of improved ADRC based heading control.

关键词： active disturbance rejection control(ADRC) tracking-differentiator(TD) extended state observer(ESO) total disturbance chattering underwater flight vehicle(UFV)

Depth control of an underwater flight vehicle at low speeds and depths

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Depth control of an underwater flight vehicle at low speeds ...

形象学视阈下德译《浮生六记》对中国文化形象的建构研究

第37届中国控制会议

作者： Shuo zhao Zhengping Feng tianhai Zheng Wanjun Pan School of Naval Architecture Ocean & Civil EngineeringShanghai Jiao Tong University Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration Shanghai Jiao Tong University

Due to low efficiency of control surfaces and considerable wave-suction force, depth control of an underwater fligh vehicle, moving near surface with a low speed, is extremely hard. To improve depth control performance under such challenging scenarios, a depth-oriented driving scheme where independent bow and stern planes are combined to form virtually a singl actuator to generate pure vertical force for heave motion, is proposed. ADRC（active disturbance rejection controller）–base depth controller is then designed. Both the results of simulations and tank tests of depth control of an underwater flight vehicl verify the effectiveness of the driving scheme proposed.

关键词： underwater flight vehicle depth-oriented driving scheme active disturbance rejection controller tank test

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外国语 2024年第1期47卷 98-106页

作者：付天海赵轩大连外国语大学德语学院辽宁大连116044 西南交通大学外国语学院四川成都611756

《浮生六记》是清代文人沈复所著自传性散文随笔,文笔古雅简练,内涵丰富深邃,兼具高度的文学价值和研究意义。德国汉学家赖内·史华慈于1989年出版的《浮生六记》德译本完整详尽地展现了原著的精神风貌,同时补充了丰富的副文本信息。从... 详细信息

《浮生六记》是清代文人沈复所著自传性散文随笔,文笔古雅简练,内涵丰富深邃,兼具高度的文学价值和研究意义。德国汉学家赖内·史华慈于1989年出版的《浮生六记》德译本完整详尽地展现了原著的精神风貌,同时补充了丰富的副文本信息。从形象学视阈出发阐释德译《浮生六记》副文本和正文本内涵,对于探究译著所构建的中国文化形象具有重要的研究意义和文化价值。

关键词：形象学中国文化形象《浮生六记》德译本

EC50 of sufentanil under target controlled propofol for Inhibition of cardiovascular responses to hypertension patients

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EC50 of sufentanil under target controlled propofol for Inhi...