GPON中基于认购速率和QoS等级的动态带宽分配算法

为了实现吉比特无源光网络带宽分配的公平性，降低网络的传输延时，设计了一种新的媒质访问控制协议，提出了一种新的动态带宽分配算法。其基本思想是：在保证拥有不同QoS业务的用户得到认购速率的基础上，根据网络负载的大小，动态地将某些用户未使用的带宽分配给其他带宽需求大的用户，以提高网络的带宽利用率。仿真结果表明，这种新的算法在严格控制数据传输延时的前提下，能够保证多用户之间带宽分配的公平性。     

一种延长EPON传输距离的方法

在以太无源光网络(EPON)系统中,光线路终端(OLT)和光网络单元(ONU)之间的最长光纤传输距离为20km,但在某些光纤到村(FTTV)之类的应用中,光纤线路的距离达到了80km甚至更远.文章提出了一种延长EPON系统传输距离的方法,它实现了一种适用于EPON系统的光功率放大器,且对EPON的注册发现窗口,上行带宽分配周期等参数进行了调整.     

基于正交频分复用无源光网络的动态带宽分配算法研究

介绍了一种应用于未来大容量、多业务接入场景下的称为光正交频分复用无源光网络的下一代接入网技术,并提出了一种基于此结构的称为基于服务质量需求的固定周期流水线轮询动态带宽分配算法.该算法通过应用二级带宽分配机制、带宽预申请机制和最小带宽申请优先原则等方法,有效地保障了在大容量、多业务接入场景下各个业务不同的服务质量需求.为研究其性能,建立了该算法的仿真模型并进行了对比仿真.仿真结果显示该算法以低时延和低抖动有效地支持快速转发业务,同时平衡了确保转发业务和尽力而为业务之间的优先性和相对公平性,并且实现了不同光网络单元间的同优先级业务带宽分配的公平性.与传统的动态带宽分配算法算法相比,基于服务质量需求的固定周期流水线轮询动态带宽分配算法具有执行效率高、算法复杂度低、性能良好等优点,并且能够更好地适应光正交频分复用无源光网络的特性,发挥网络最大的性能.     

Design for the lattice with 4-DBA structure of the compact laser-electron storage ring

We try to design the lattice with 2 super periods and 4-DBA structure in order to provide more drifts for the future development of the TTX source. Due to the space limitation in the lab, the 4-DBA lattice is suitable.In the paper,we present the lattice design with a 4-DBA structure mainly for the pulse mode of the compact laser-electron storage ring (LESR). Element parameters of the lattice are optimized with the help of the professional software and beam dynamics such as intra-beam scattering (IBS) and Compton scattering (CS) are calculated. Besides, the fringe field effect is analyzed with the numerical method.     

Antibody-based surfaces: rapid characterization using two complementary colorimetric assays

Finding a general solution for optimizing the grafting of antibody on solid surfaces is difficult due to the variety of material, grafting principles and chemistries or surface formats available (beads, microplates, fibers, etc.). Pre-screening methods able to assess grafting efficiency (GE) and specific activity (SA) are required. In this context, we present here two colorimetric assays that can be used on a wide variety of surface format, chemistry, etc. The first one, ADECA (Amino Density Estimation by Colorimetric Assay) allows a rapid estimation of grafted antibodies and allows calculating the GE. The second one, A₂HRP (Antibody Anti-HorseRadish Peroxidase) provides a measure of the amount of active antibody, which, combined to ADECA, is used to determine the SA of grafted antibody. Analytical parameters (limit of detection, repeatability, linearity, etc.) of these two colorimetric assays are presented. Using two commercially available microplates, we demonstrated that, when used in parallel, these rapid and sensitive methods are well adapted to pre-screening of antibody grafting performances.     

一种EPON-WiMAX融合网络带宽分配算法

文中提出了一种应用于EPON和WiMAX的融合网络,实现用户多优先级业务区分并保证用户QoS的动态带宽分配算法。算法让EPON网络和WiMAX网络协同分配带宽,在EPON网络带宽分配的过程中加入WiMAX网络的带宽分配。整体算法使得因得不到足够带宽而受到影响的用户数保持在最小,同时加入令牌机制兼顾了用户之间的公平性。文中在现有融合网络框架的基础上提出算法,并给出了算法的具体设计步骤,详细分析了带宽申请和分配的过程,讨论了算法的优越性。     

APON业务调度算法的研究与实现

利用业务调度算法实现不同业务等级间的动态带宽分配（DBA），从而保证接入业务的服务质量（QoS)，是异步转移模式无源光网络（APON）系统的关键技术之一，文章所设计的APON系统业务调度算法，通过基本带宽分配和剩余带宽再分配实现了业务等级间的动态带宽分配，算法建模仿真和系统实际测试证明算法具有良好的性能，实现简单，可用性强。     

A Two‐Step Scheduling Algorithm to Support Dual Bandwidth Allocation Policies in an Ethernet Passive Optical Network

In this paper, we design a two‐step scheduling algorithm to support multiple bandwidth allocation policies for upstream channel access in an Ethernet passive optical network. The proposed scheduling algorithm allows us a simultaneous approach for multiple access control policies: static bandwidth allocation for guaranteed bandwidth service and dynamic bandwidth allocation for on‐demand, dynamic traffic services. In order to reduce the scheduling complexity, we separate the process of the transmission start‐ time decision from the process of grant generation. This technique does not require the timing information of other bandwidth allocation modules, so respective modules are free from a heavy amount of timing information or complex processing.     

基于HiNOC网络动态带宽分配新算法的实现

提出一种新型的Hi NOC动态带宽分配算法,利用令牌桶给各个HM分配令牌,在每个MAP周期都重新进行一次计算,以分配在本MAP周期内HM所需发送的令牌数,并按比例进行截断,依次对HM的数据进行均衡。这样将最大程度地合理分配每个HM的数据发送时间,既保证每个HM分配带宽的公平性,又能有效的降低发送时延。     

基于OpnetModeler的EPON建模和带宽分配算法仿真研究

介绍了一种适用于Interleaved Polling with stop方式带宽分配算法的EPON系统仿真模型.该模型可以对最大端到端延迟、平均端到端延迟和业务吞吐量等参数进行仿真.在此模型的基础上仿真了一种基于QoS的区分优先级的带宽分配算法,最后给出了相应的仿真结果.