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Adaptive Mobile Video Delivery Based on Fountain Codes and DASH:A Survey

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ZTE Communications 2018年第3期16卷 9-14页

作者： WU Kesong cao Xianbin CHEN Zhifeng WU Dapeng Beihang University Beijing 1001911 China Fuzhou University Fuzhou 350116China University of Florida Gainesville 32611USA

Recent years have witnessed an explosive growth in mobile video-based services and efficient and reliable video delivery draws more and more attention. As a type of rateless codes, fountain codes can automatically adapt to wireless channel conditions with- out any knowledge of channels. This paper provides an overview of several typical Foi-ward Error Correction （FEC） codes, such as Reed-Solomon （RS） code, Tornado code, Luby-Transform （lt） code, and Raptor code. We focus on a novel delay-aware fountain coding （DAF） technique that maxinfizes the code word length under the constraint of a given delay. Based on DAF, this paper also presents Unequal Error Protection DAF （UEP-DAF） which improves the Peak Signal to Noise Ratio （PSNR） without additional co- ordination between the encoder and the decoder, as well as Model Predictive Control DAF （MPC-DAF） which reduces the compu- tational complexity to an affordable level for real-time video comnmnications. Moreover, we review- video streaming technologies, then introduce Dynamic Adaptive Streaming over HTTP （DASH） and DASH over Multiple Content Distribution Servers （MCDS- DASH） in detail. Based on MCDS-DASH that adapts video bitrate at the block level to alleviate video fluctuation, we propose a novel approach to integrating fountain codes with MCDS-DASH, which is capable of achieving unprecedented high throughput.

关键词： mobile video delivery DAF UEP MPC DASH

The Effect of Bariatric Surgery on Male Sexual Function,Sperm Parameters and Lower Urinary Tract Symptoms:a Systematic Review and Meta-analysis

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The Effect of Bariatric Surgery on Male Sexual Function,Sper...

第十二次全国中西医结合男科学术大会暨全国中西医结合男科诊疗技术研修班暨2017上海市中西医结合学会上海市中医药学会泌尿男科专业委员会学术年会

作者： XiaodongJin Jun-Jie cao Min cao Hongshen Wu Wei Huang ZiMengXu Yongyi Yang Yan Zhang Feifan Wang Department of Urology The First Affiliated HospitalZhejiang UniversitySchool of Medicine

BackgroundThere is emerging awareness of obese characteristics in males with sexual function,sperm parameters and lower urinary tract symptom(LUTS).lt is well documented that bariatric surgery(BS) has become a valid treatment of morbid obesity to achieve great weight loss *** aim of this study is to investigate the differences of male sexual function,sperm parameters and LUTS before and after ***,the Cochrane Library and PubMed database and references from relevant articles were searched between January 2001 and March 2017.A meta-analysis was conducted to investigate the alteration tendency of male sexual function,sperm parameters and LUTS factors after *** total,21 studies were included,but only ten studies were suitable for the *** International Index of Erectile Function(IIEF) total scores increased significantly after BS(P=0.003).Moreover,the scores in four IIEF domains of erectile function(EF)(P<0.00001),sexual desire(SD)(P<0.00001),intercourse satisfaction(IS)(P<0.00001) and overall satisfaction(OS)(P<0.00001) were significantly higher in post-operative groups as well,except for orgasmic function(OF)(P=0.05).The sperm parameters including sperm volume(P=0.01) and normal morphology rates(P=0.001) were improved significantly after BS except for the sperm motility(P=0.74) and sperm concentration(P=0.57).The total scores of the International Prostate Symptom Score(IPSS)(P<0.00001) in the post-operative groups were significantly lower than that in pre-operative *** represented an effective obesity treatment in not only losing weight but also improving the males’ sexual function,sperm parameters and LUTS.

关键词： Obesity Bariatric surgery Sexual function Sperm parameters Lower urinary tract symptom

来源： cnki会议评论

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极地海洋工程装备圆管结构的对流换热影响

上海交通大学学报 2023年第1期57卷 17-23页

作者：操太春吴刚孔祥逸于东玮吴琳张大勇大连理工大学海洋科学与技术学院辽宁盘锦124221 大连理工大学运载工程与力学学部辽宁大连116023 中国船舶及海洋工程设计研究院上海200021

电伴热是极地海洋工程装备防寒主要措施,而热平衡是对流换热的关键问题.以圆管构件为研究对象,采用有限元数值仿真软件Fluent数值仿真与模型实验相结合的方法,分析了圆管构件在风速为0~40 m/s、温度为-40~0℃的极地环境条件下对流换热... 详细信息

电伴热是极地海洋工程装备防寒主要措施,而热平衡是对流换热的关键问题.以圆管构件为研究对象,采用有限元数值仿真软件Fluent数值仿真与模型实验相结合的方法,分析了圆管构件在风速为0~40 m/s、温度为-40~0℃的极地环境条件下对流换热系数变化情况;基于数值仿真数据建立了电加热圆管构件对流换热系数的预测模型.结果表明:增大风速和降低温度都会增加圆管构件的对流换热系数;温度低于-30℃或风速大于25 m/s且温度低于-20℃时,温度对圆管的对流换热系数影响增大;实测数据验证了该模型的合理性.

关键词：极地圆管构件对流换热数值模拟实验测试

Respiratory arrest associated with polymyxin B in a lung transplant patient

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Chinese Medical Journal 2020年第11期133卷 1375-1377页

作者： Wen-Hui Chen Lan Lin Xiao-Xing Wang Xu-Dong Kong Li-Juan Guo Li Zhao Chao-Yang Liang Bin Xing Bin cao Chen Wang Jing-Yu Chen Departm ent of Lung Transplantation Center of Respiratory MedicineChina-Japan Friendship HospitalBeijing 100029China Department of Respiratory Medicine Fujian Medical University Union HospitalFuzhouFujian 350001China Department of Pharmacy China-Japan Friendship HospitalBeijing 100029China Department of Pulmonary and Critical Care Medicine Center for Respiratory DiseasesChina-Japan Friendship HospitalBeijing 100029China Institute of Respiratory Medicine Chinese Academy of Medical SciencesBeijing 100029China Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100006China

To the Editor:The polymyxin antibiotics colistin(polymyxin E)and polymyxin B(PMB)became available in the 1950s;thus,they did not undergo contemporary drug development *** clinical use has recently resurged,assuming an important role as salvage therapv for otherwise untreatable gram-negative infection.[1]Multidrug-resistant(MDR)bacterial infections are primarily caused by gram-negative bacilli(GNB),such as Pseudomonas aeruginosa and Klebsiella pneumoniae^in lung transplant(lt)patients.[2]The increasing prevalence of MDR-GNB infections in lt patients has led to an upsurge in the use of these“older”*** the treatment course,we should pay attention to severe and life-threatening respiratory paralysis caused by neuromuscular blockage associated with ***,we report a rare case of a 67-year-old lt patient who suffered from respiratory arrest induced by PMB.

关键词： patient lung respiratory

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自润滑陶瓷刀具切削过程中的减摩机理研究

硅酸盐学报 2006年第10期34卷 1232-1237页

作者：曹同坤邓建新青岛科技大学机电工程学院山东青岛266061 山东大学机械工程学院济南250061

采用热压法CaF2作为添加剂,Al2O3/TiC(lt55)作为基体制备出了自润滑陶瓷刀具,并对其进行了干切削试验。在切削过程中,在刀具前刀面上能形成自润滑膜,从而使刀具具有减摩性能。用扫描电镜观察了前刀面和后刀面微观结构。lt55在切削加工4... 详细信息

采用热压法CaF2作为添加剂,Al2O3/TiC(lt55)作为基体制备出了自润滑陶瓷刀具,并对其进行了干切削试验。在切削过程中,在刀具前刀面上能形成自润滑膜,从而使刀具具有减摩性能。用扫描电镜观察了前刀面和后刀面微观结构。lt55在切削加工45钢时,Al2O3/TiC/CaF2(ATF)自润滑陶瓷刀具前刀面的平均摩擦系数比未添加固体润滑剂的lt55陶瓷刀具显著降低,其主要原因是在ATF自润滑陶瓷刀具的前刀面上形成了一层固体润滑膜,这层润滑膜可起到减摩作用。自润滑刀具在切削过程中,自润滑膜经历生成、破损、脱落、再生成的循环过程,因此,ATF自润滑陶瓷刀具在其整个生命周期内都具有自润滑效果。自润滑刀具后刀面不存在固体润滑膜,具有较明显的磨料磨损特征。

关键词：陶瓷刀具自润滑干切削摩擦磨损

实现由工业反哺农业向工农业协调发展战略转变

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中州学刊 2016年第11期 24-28页

作者：曹俊杰山东理工大学商学院山东理工大学农业与农村经济研究中心

工业反哺农业是我国进入工业化中期以后需要实施的一项经济发展战略,是我国实现农业持续健康发展和加快农业现代化进程的必然选择,工业欠账论、农业弱质性理论和农业多功能性理论等,为实施工业反哺农业战略提供了充分的理论依据。但是,... 详细信息

工业反哺农业是我国进入工业化中期以后需要实施的一项经济发展战略,是我国实现农业持续健康发展和加快农业现代化进程的必然选择,工业欠账论、农业弱质性理论和农业多功能性理论等,为实施工业反哺农业战略提供了充分的理论依据。但是,工业反哺农业只是国民经济发展的短期目标,长期目标则是实现工农业协调发展,工业反哺农业是实现工农业协调发展的前提条件,应当及时实现由工业反哺农业向工农业协调发展战略转变,通过农业产业化、城市企业下乡和新型城镇化等途径促进工农业协调发展。

关键词：工业反哺农业反哺理论工农业协调发展战略转变

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簧片式继电器固有振动特性研究

电工技术学报 2020年第2期35卷 292-299页

作者：张高廷曹云东刘炜沈阳工业大学电器新技术与应用研究所沈阳110870 沈阳铁路信号有限责任公司沈阳110025

在簧片式继电器中,簧片作为一种柔性体,易发生耦合共振,造成继电器工作可靠性下降。该文根据梁弯曲理论建立触簧系统振动分析模型,对触簧系统的固有振动参数进行数值计算。在考虑实际振动条件下,选择Bathe复合时间积分算法进行有限元实... 详细信息

在簧片式继电器中,簧片作为一种柔性体,易发生耦合共振,造成继电器工作可靠性下降。该文根据梁弯曲理论建立触簧系统振动分析模型,对触簧系统的固有振动参数进行数值计算。在考虑实际振动条件下,选择Bathe复合时间积分算法进行有限元实例仿真分析,得到了簧片的固有振动特性。通过振动试验结果与仿真数据的对比,证明该文的分析方法具有较准确的固有振动特性求解能力,并可为相关低压电器的固有振动特性研究和结构优化提供一定的参考。

关键词：簧片式继电器触簧系统固有振动特性振动试验

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11个南竹北移竹种抗寒性差异

世界竹藤通讯 2022年第S1期20卷 6-13,67页

作者：耿颖陈炳卓曹帮华曹晓楠张琦刘炜张家昌山东农业大学黄河下游森林培育国家林业和草原局重点实验室山东泰安271018 沂源县中庄镇人民政府山东淄博256109

利用半致死温度(lt50)探讨不同竹种间抗寒性及冷驯化能力,筛选抗寒能力强、冷驯化能力佳的竹种,为我国“南竹北移”竹种选择、抗寒竹种引种等工作提供科学依据。以从江苏扬州引种至山东的11个竹种为试验材料,采用电导法配合Logistic方... 详细信息

利用半致死温度(lt50)探讨不同竹种间抗寒性及冷驯化能力,筛选抗寒能力强、冷驯化能力佳的竹种,为我国“南竹北移”竹种选择、抗寒竹种引种等工作提供科学依据。以从江苏扬州引种至山东的11个竹种为试验材料,采用电导法配合Logistic方程推算各竹种的低温半致死温度。结果表明:11个竹种在来源地江苏的抗寒性强弱排序依次是:金镶玉竹>早园竹>毛金竹>黄纹竹>四季竹>阔叶箬竹>茶秆竹>乌哺鸡竹>大明竹>斑苦竹>紫竹;在引种地山东的抗寒性排序是:金镶玉竹>茶秆竹>大明竹>早园竹>黄纹竹>四季竹>乌哺鸡竹>毛金竹>斑苦竹>阔叶箬竹>紫竹。11个供试竹种中抗寒能力最强的是金镶玉竹,经引种地的低温驯化后,冷驯化能力最强的是大明竹,其次是茶秆竹和斑苦竹;最弱的是毛金竹和阔叶箬竹,未表现出冷驯化能力。

关键词：观赏竹半致死温度抗寒性冷驯化南竹北移

Clathrin-dependent endocytosis predominantly mediates protein absorption by fat body from the hemolymph in Bombyx mori

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Insect Science 2020年第4期27卷 675-686页

作者： Yu-Jie Wang Shu-Yan Li Jia-Ye Zhao Kang Li Jing Xu Xian-Ying Xu Wen-Mei Wu Rong Yang Yang Xiao Ming-Qiang Ye Ji-Ping Liu Yang-Jin Zhong Yang cao Hui-Yu Yi Ling Tian Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding/Guangdong Provincial Sericulture and Mulberry Engineering Research Center College of Animal ScienceSouth China Agricultural UniversityGuangzhouChina Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology Institute of Insect Science and TechnologySchool of Life SciencesSouth China Normal UniversityGuangzhouChina The Sericultural and Agri-Food Research Institute of the Guangdong Academy of Agricultural Sciences GuangzhouChina

During insect larval-pupal metamorphosis,proteins in the hemolymph are absorbed by the fat body for the maintenance of intracellular homeostasis;however,the type of proteins and how these proteins are internalized into the fat body are *** Bombyx mori,the developmental profiles o f total proteins in the hemolymph and fat body showed that hemolymph-decreased protein bands(55-100 kDa)were in accordance with those protein bands that increased in the fat *** o f clathrin-dependent endocytosis predominantly blocked the transportation o f 55-100 kDa proteins from the hemolymph into the fat body,which was further verified by RNA interference treatment o f *** hexamerins were shown to comprise〜90%of the total identified proteins in both the hemolymph and fat body by mass spectrum(MS)*** addition,hemolymphspecific proteins were mainly involved in material transportation,while fat body-specific proteins particularly participated in *** this paper,four hexamerins were found for the first time,and potential proteins absorbed by the fat body from the hemolymph through clathrin-dependent endocytosis were *** study sheds light on the protein absorption mechanism during insect metamorphosis.

关键词： Bombyx mori clathrin-mediated endocytosis fat body hemolymph uptake of proteins