一直以来,互联网IP网络的服务质量(Quality of Service, QoS)是研究人员关注的热点问题,提出了一系列理论和解决方案。QoS为各种网络应用提供了带宽、延迟、丢包率等的保证,对多媒体应用至关重要。本文分析了传统QoS技术存在的问题,并...一直以来,互联网IP网络的服务质量(Quality of Service, QoS)是研究人员关注的热点问题,提出了一系列理论和解决方案。QoS为各种网络应用提供了带宽、延迟、丢包率等的保证,对多媒体应用至关重要。本文分析了传统QoS技术存在的问题,并提出了利用SDN技术提升网络QoS服务质量的观点。对基于OpenFlow协议提升QoS服务质量的一些关键技术进行了介绍。本文是利用SDN网络实现QoS技术的指南,同时也为其他网络服务在SDN框架下的实现提供了重要的实际借鉴意义。展开更多
Job burnout is an important factor affecting the work attitude and professional behavior of family doctors.This paper reviews the measurement tools,influencing factors and intervention strategies of job burnout,it is ...Job burnout is an important factor affecting the work attitude and professional behavior of family doctors.This paper reviews the measurement tools,influencing factors and intervention strategies of job burnout,it is suggested that improving job burnout can improve job satisfaction,work efficiency and reduce turnover intention of family doctors,and it is of great significance to the construction of family doctor team and the improvement of work quality.展开更多
The long-chain ionic liquid 1-hexadecyl-3-methylimidazolium chloride (C16mimCl) was used as atemplate to prepare cerium-doped MCM-48 materials inbasic medium by a hydrothermal synthesis procedure. Theeffect of the amo...The long-chain ionic liquid 1-hexadecyl-3-methylimidazolium chloride (C16mimCl) was used as atemplate to prepare cerium-doped MCM-48 materials inbasic medium by a hydrothermal synthesis procedure. Theeffect of the amount of Ce salt and C16mimCl/Si on thesynthesis were discussed in detail. This mesoporousmaterial exhibits a pore architecture which is cubic Ia3dgyroid and possesses a large surface area and a narrowpore distribution. Cerium in calcined porous frameworkexists in the form of well-dispersed tetrahedral coordination.The C16mimCl shows a high tendency toward selfaggregationthat allows the formation of the ceriumdopedgyroid mesostructure by using the appropriateamount of Ce salt.展开更多
文摘一直以来,互联网IP网络的服务质量(Quality of Service, QoS)是研究人员关注的热点问题,提出了一系列理论和解决方案。QoS为各种网络应用提供了带宽、延迟、丢包率等的保证,对多媒体应用至关重要。本文分析了传统QoS技术存在的问题,并提出了利用SDN技术提升网络QoS服务质量的观点。对基于OpenFlow协议提升QoS服务质量的一些关键技术进行了介绍。本文是利用SDN网络实现QoS技术的指南,同时也为其他网络服务在SDN框架下的实现提供了重要的实际借鉴意义。
文摘Job burnout is an important factor affecting the work attitude and professional behavior of family doctors.This paper reviews the measurement tools,influencing factors and intervention strategies of job burnout,it is suggested that improving job burnout can improve job satisfaction,work efficiency and reduce turnover intention of family doctors,and it is of great significance to the construction of family doctor team and the improvement of work quality.
基金the Natural Science Foundation of Yunnan Province/China(Grant No.2003E0005Z).
文摘The long-chain ionic liquid 1-hexadecyl-3-methylimidazolium chloride (C16mimCl) was used as atemplate to prepare cerium-doped MCM-48 materials inbasic medium by a hydrothermal synthesis procedure. Theeffect of the amount of Ce salt and C16mimCl/Si on thesynthesis were discussed in detail. This mesoporousmaterial exhibits a pore architecture which is cubic Ia3dgyroid and possesses a large surface area and a narrowpore distribution. Cerium in calcined porous frameworkexists in the form of well-dispersed tetrahedral coordination.The C16mimCl shows a high tendency toward selfaggregationthat allows the formation of the ceriumdopedgyroid mesostructure by using the appropriateamount of Ce salt.
