Network Functions Virtualization(NFV) is an attempt to help operators more effectively manage their networks by implementing traditional network functions embedded in specialized hardware platforms in term of virtuali...Network Functions Virtualization(NFV) is an attempt to help operators more effectively manage their networks by implementing traditional network functions embedded in specialized hardware platforms in term of virtualized software instances. But, existing novel network appliances designed for NFV infrastructure are always architected on a general-purpose x86 server, which makes the performance of network functions limited by the hosted single server. To address this challenge, we propose ApplianceB ricks, a novel NFV-enable network appliance architecture that is used to explore the way of consolidating multiple physical network functions into a clustered network appliance, which is able to improve the processing capability of NFV-enabled network appliances.展开更多
Nowadays renewable energy has become a trend for energy production but its variable nature has made balancing of demand and supply of the power grid difficult. Dynamic demand management using smart appliances is propo...Nowadays renewable energy has become a trend for energy production but its variable nature has made balancing of demand and supply of the power grid difficult. Dynamic demand management using smart appliances is proposed to serve as a way that part of the regulation burden of balancing demand and supply is shifted to the demand side. However, if all appliances respond to the same frequency deviation, they may start to synchronize, causing large power overshoots and instability of the power grid. Therefore, the idea of implementing randomness into the frequency control of the appliances is proposed and this is what we call a stochastic approach. Simulators are built from scratch to model both scenarios. The effect of synchronization is analyzed and the parameters that can affect the synchronization are investigated. It has been found that the larger the contribution from the smart appliances to the power grid, the easier and faster the synchronization takes place. The stochastic approach solves the problem of synchronization and averages out the large power overshoot. However, the overall performance of stochastic operations is unacceptable due to the randomness in the operation though the mean and variance are as expected. More advanced feedback policies and schemes may be designed to achieve a better performance.展开更多
In the project Wendelstein 7-X (W7-X), the popular fieldbus Profibus has been determined as a uniform connection between the central control system and all the subordinate systems. A universal embedded control system ...In the project Wendelstein 7-X (W7-X), the popular fieldbus Profibus has been determined as a uniform connection between the central control system and all the subordinate systems. A universal embedded control system has been developed for W7-X power supply controlling. Siemens 80C167CR microcontroller is used as the central control unit of the system. With a user-defined printed circuit board (PCB) several control buses, i.e., Profibus, CAN, IEEE 488, RS485 and RS 232 have been connected to the microcontroller. The corresponding hardware interfaces for the control buses have been designed. A graphic liquid crystal display(LCD) and a user-defined keyboard are used as user interface. The control software will be developed with a C-like language, i.e., C166 for the controller.展开更多
目的比较直丝弓矫治器和Invisalign矫治器在错[牙合]畸形拔牙患者排齐阶段支抗需求的应用效果。方法回顾性分析2019年7月至2023年9月收治的错[牙合]畸形拔牙排齐阶段支抗需求患者,根据正畸方式不同分为直丝组(应用直丝弓矫治器)与隐形组...目的比较直丝弓矫治器和Invisalign矫治器在错[牙合]畸形拔牙患者排齐阶段支抗需求的应用效果。方法回顾性分析2019年7月至2023年9月收治的错[牙合]畸形拔牙排齐阶段支抗需求患者,根据正畸方式不同分为直丝组(应用直丝弓矫治器)与隐形组(应用Invisalign矫治器),倾向性匹配排除基线资料混杂因素,2组各60例。2组均通过iTero扫描仪扫描石膏模型并重建三维模型,应用三维模型重叠测量各参数变化,对比2组排齐后三维模型重叠测量值、对比2组颌骨变化[下颌平面角(FMA)、下中切牙长轴延长线和下颌平面交角(IMPA)、下中切牙长轴延长线与眶耳平面交角(FMIA)、上齿槽座点-鼻根点-下齿槽座点夹角(ANB)]、软组织变化[上唇后缩度(UL To E Line)、下唇后缩度(LL To E Line)]、牙齿变化[上中切牙唇倾(U1-NA)、中下切牙舌倾(L1-NB)]以及并发症发生情况。结果隐形组排齐后U1X、U3Y、U3转矩、U5倾角重叠测量值显著低于直丝组,而U3X、U5X、U5Y、U5Z、U6X、U6Y、U6Z、U1转矩、U5转矩、U6转矩、U3倾角、U6倾角显著高于直丝组(P<0.05,P<0.01)。排齐后,2组FMA角、IMPA角、ANB角均较排齐前显著上升,FMIA角较排齐前下降(P<0.05)。排齐后,2组UL To E Line、LL To E Line均较排齐前显著下降(P<0.05)。排齐后,2组U1-NA较排齐前显著下降,L1-NB较排齐前上升,且隐形组U1-NA低于直丝组,L1-NB高于直丝组(P<0.05);隐形组与直丝组并发症发生率[3.33%(2/60)vs 6.67%(4/60)]比较差异无统计学意义(P>0.05)。结论直丝弓矫治器和Invisalign矫治器均可用于错[牙合]畸形拔牙患者排齐阶段支抗需求,然二者均存在部分支抗丢失,临床应合理选择矫治方案。展开更多
基金supported by Program for National Basic Research Program of China (973 Program) "Reconfigurable Network Emulation Testbed for Basic Network Communication"
文摘Network Functions Virtualization(NFV) is an attempt to help operators more effectively manage their networks by implementing traditional network functions embedded in specialized hardware platforms in term of virtualized software instances. But, existing novel network appliances designed for NFV infrastructure are always architected on a general-purpose x86 server, which makes the performance of network functions limited by the hosted single server. To address this challenge, we propose ApplianceB ricks, a novel NFV-enable network appliance architecture that is used to explore the way of consolidating multiple physical network functions into a clustered network appliance, which is able to improve the processing capability of NFV-enabled network appliances.
文摘Nowadays renewable energy has become a trend for energy production but its variable nature has made balancing of demand and supply of the power grid difficult. Dynamic demand management using smart appliances is proposed to serve as a way that part of the regulation burden of balancing demand and supply is shifted to the demand side. However, if all appliances respond to the same frequency deviation, they may start to synchronize, causing large power overshoots and instability of the power grid. Therefore, the idea of implementing randomness into the frequency control of the appliances is proposed and this is what we call a stochastic approach. Simulators are built from scratch to model both scenarios. The effect of synchronization is analyzed and the parameters that can affect the synchronization are investigated. It has been found that the larger the contribution from the smart appliances to the power grid, the easier and faster the synchronization takes place. The stochastic approach solves the problem of synchronization and averages out the large power overshoot. However, the overall performance of stochastic operations is unacceptable due to the randomness in the operation though the mean and variance are as expected. More advanced feedback policies and schemes may be designed to achieve a better performance.
文摘In the project Wendelstein 7-X (W7-X), the popular fieldbus Profibus has been determined as a uniform connection between the central control system and all the subordinate systems. A universal embedded control system has been developed for W7-X power supply controlling. Siemens 80C167CR microcontroller is used as the central control unit of the system. With a user-defined printed circuit board (PCB) several control buses, i.e., Profibus, CAN, IEEE 488, RS485 and RS 232 have been connected to the microcontroller. The corresponding hardware interfaces for the control buses have been designed. A graphic liquid crystal display(LCD) and a user-defined keyboard are used as user interface. The control software will be developed with a C-like language, i.e., C166 for the controller.
文摘目的比较直丝弓矫治器和Invisalign矫治器在错[牙合]畸形拔牙患者排齐阶段支抗需求的应用效果。方法回顾性分析2019年7月至2023年9月收治的错[牙合]畸形拔牙排齐阶段支抗需求患者,根据正畸方式不同分为直丝组(应用直丝弓矫治器)与隐形组(应用Invisalign矫治器),倾向性匹配排除基线资料混杂因素,2组各60例。2组均通过iTero扫描仪扫描石膏模型并重建三维模型,应用三维模型重叠测量各参数变化,对比2组排齐后三维模型重叠测量值、对比2组颌骨变化[下颌平面角(FMA)、下中切牙长轴延长线和下颌平面交角(IMPA)、下中切牙长轴延长线与眶耳平面交角(FMIA)、上齿槽座点-鼻根点-下齿槽座点夹角(ANB)]、软组织变化[上唇后缩度(UL To E Line)、下唇后缩度(LL To E Line)]、牙齿变化[上中切牙唇倾(U1-NA)、中下切牙舌倾(L1-NB)]以及并发症发生情况。结果隐形组排齐后U1X、U3Y、U3转矩、U5倾角重叠测量值显著低于直丝组,而U3X、U5X、U5Y、U5Z、U6X、U6Y、U6Z、U1转矩、U5转矩、U6转矩、U3倾角、U6倾角显著高于直丝组(P<0.05,P<0.01)。排齐后,2组FMA角、IMPA角、ANB角均较排齐前显著上升,FMIA角较排齐前下降(P<0.05)。排齐后,2组UL To E Line、LL To E Line均较排齐前显著下降(P<0.05)。排齐后,2组U1-NA较排齐前显著下降,L1-NB较排齐前上升,且隐形组U1-NA低于直丝组,L1-NB高于直丝组(P<0.05);隐形组与直丝组并发症发生率[3.33%(2/60)vs 6.67%(4/60)]比较差异无统计学意义(P>0.05)。结论直丝弓矫治器和Invisalign矫治器均可用于错[牙合]畸形拔牙患者排齐阶段支抗需求,然二者均存在部分支抗丢失,临床应合理选择矫治方案。
