基于MSC Pool内负荷的动态反馈控制

本文针对MSC Pool中出现的负荷不均衡现象,提出了一种简单的基于负荷的动态反馈控制技术。仿真结果及相关分析显示此种反馈技术在理论和实际应用中均可行。     

A memetic algorithm for graph coloring

Given an undirected graph G=(V,E)$G=(V\text{,}E)$ with a set V of vertices and a set E of edges, the graph coloring problem consists of partitioning all vertices into k independent sets and the number of used colors k is minimized. This paper presents a memetic algorithm (denoted by MACOL) for solving the problem of graph coloring. The proposed MACOL algorithm integrates several distinguished features such as an adaptive multi-parent crossover (AMPaX) operator and a distance-and-quality based replacement criterion for pool updating. The proposed algorithm is evaluated on the DIMACS challenge benchmarks and computational results show that the proposed MACOL algorithm achieves highly competitive results, compared with 11 state-of-the-art algorithms. The influence of some ingredients of MACOL on its performance is also analyzed.     

基于分级流量控制中心技术的短信池动态容灾备份解决方案

建立完善有效的短消息中心容灾备份系统是保障短消息业务正常开展的必不可少的一项重要措施。本文将对基于分级流量控制中心技术的短信池（SMSCP001）容灾备份解决方案进行研究,并分析其在现网应用的可行性。     

基于Iu_flex的MSC Pool技术分析

MSC池（MSCin Pool）是由3GPP规范定义的,能优化整个移动网络的组网。本文简要介绍了MSC Pool技术的基本原理及其组网特点,分析了MSC Pool所用到的关键技术（NRI路由机制和负荷分担）,重点讨论了核心网D接口信令的流量,根据MSC Pool的技术特点,提出了组网规划的前提条件和规划时需要注意的问题,最后总结了MSC Pool技术的特点,在结论部分给出了MSC Pool可能存在的安全隐患。     

MSC池组实现技术方案分析

MSC池（MSC in Pool）是由3GPP规范定义的,在GSM/MSS/WCDMA系统的核心网络开发的一个特殊功能,能优化整个移动网络的组网。本文主要介绍了该项技术的几种实现方案,并对其产生的影响作出了分析。     

TD-LTE EPC组POOL传送方案研究

随着我国4G牌照的发放,中国移动开始大规模部署TD-LTE网络,采取了LTE EPC集中部署、PTN回传等组网方案及技术。本文从LTE回传现状出发,重点讨论EPC组Pool的传送方案,并结合规划实例进行说明,提出L3 PTN带宽规划和设备选型的相关建议,为EPC组Pool传送网建设提供参考。     

MSC Pool技术在河南移动网络中的研究和应用

本文针对MSC Pool技术在河南移动实际组网中和容灾场景中遇到的自动容灾和被叫恢复问题,进行了深入的分析并提出了有效的解决方案,将3GPP协议中的VLR Restore流程引入到MSC Pool容灾场景,利用SCCP层备份寻址实现HLR路由数据的自动倒换。多次模拟实验证明,该方案能够自动,零时间内实现核心网网元级设备容灾场景下的一次被叫恢复难题。并且,本方案属于零投资、采用开放的协议和规范、不局限设备厂家和软件版本,为MSC Pool技术在河南移动的大规模应用铺平了道路,确保了区域经济的平稳、健康发展。     

MSC Pool负荷迁移机制及应用研究

针对常规MSC Pool负荷迁移后存在的MSC Pool中各MSC间负荷仍不均衡的情况,创立了基于话务模型的数据预测和多次迭代算法的迁移流程,实现了MSC Pool内的负荷均衡,并通过网管程序实现了负荷不均衡自动监测和负荷自动调整.     

Heterogeneous nucleation on ultra smooth surfaces

An experimental investigation is presented with heterogeneous nucleate boiling on ultra smooth metallic surfaces (30-365 nm RMS roughness), including brass, unpolished stainless steel, and electropolished stainless steel. The fluids used for the investigation are highly wetting pentane and butane. It is observed that the incipient superheat is low for all cases considered, despite the fact that no vapor trapping cavities are available for incipience at low superheat. These data provide further evidence that in addition to vapor trapping, another mechanism must be available for heterogeneous nucleation in boiling systems. The boiling curves are presented for the different surface/fluid combinations. It is found that the heat transfer rate on the brass surface is considerably better than that on the stainless steel surfaces due to the ease with which nucleation sites are formed. In contrast, nucleation site formation on stainless steel is considerably more sparse than that on brass.     

Steady-state solutions in a nonlinear pool boiling model

We consider a relatively simple model for pool boiling processes. This model involves only the temperature distribution within the heater and describes the heat exchange with the boiling fluid via a nonlinear boundary condition imposed on the fluid–heater interface. This results in a standard heat equation with a nonlinear Neumann boundary condition on part of the boundary. In this paper, we analyse the qualitative structure of steady-state solutions of this heat equation. It turns out that the model allows both multiple homogeneous and multiple heterogeneous solutions in certain regimes of the parameter space. The latter solutions originate from bifurcations on a certain branch of homogeneous solutions. We present a bifurcation analysis that reveals the multiple-solution structure in this mathematical model. In the numerical analysis a continuation algorithm is combined with the method of separation-of-variables and a Fourier collocation technique. For both the continuous and discrete problem a fundamental symmetry property is derived that implies multiplicity of heterogeneous solutions. Numerical simulations of this model problem predict phenomena that are consistent with laboratory observations for pool boiling processes.