基于MSC Pool改造后的信令监测分析方法改进研究

介绍了MSCPool技术的背景和采用的新识别技术,论述了在采用MSCPool技术的网络监测模式下,信令监测系统如何进行数据分析的方法进行研究,指出了信令监测系统合成处理调整改进方向,以及现有统计功能完善改进需求。     

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.     

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。     

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。     

Effect of surface orientation on pool boiling heat transfer of nanoparticle suspensions

Several investigators have found that there is a significant effect of surface orientation on pool boiling performance and mechanisms, when a pure liquid is boiled over tubular heating surfaces. However, there is no similar study reported in literature for pool boiling of nanoparticle suspensions. This paper investigates the effect nanoparticles, suspended in pure liquids, can have on nucleate pool boiling heat transfer at various surface orientations. Systematic experiments were conducted on a smooth tube (average surface roughness 48 nm) of diameter 33 mm and length 170 mm at various inclinations (0°, 45° and 90°). Electro-statically stabilized water-based nanoparticle suspensions containing alumina nanoparticles (primary average sizes 47 nm and 150 nm) of concentrations 0.25%, 1% and 2% percent by weight were used. It has been found that there is a significant effect of surface orientation on the heat transfer performance. Horizontal orientation gave maximum heat transfer and the heating surface, when inclined at 45°, gave minimum heat transfer. Further, it was observed that surface–particle interaction and modified bubble motion can explain the behavior.     

Two-phase flow and pool boiling heat transfer in microgravity

Researches on two-phase flow and pool boiling heat transfer in microgravity, which included ground-based tests, flight experiments, and theoretical analyses, were conducted in the National Microgravity Laboratory/CAS. A semi-theoretical Weber number model was proposed to predict the slug-to-annular flow transition of two-phase gas–liquid flows in microgravity, while the influence of the initial bubble size on the bubble-to-slug flow transition was investigated numerically using the Monte Carlo method. Two-phase flow pattern maps in microgravity were obtained in the experiments both aboard the Russian space station Mir and aboard IL-76 reduced gravity airplane. Mini-scale modeling was also used to simulate the behavior of microgravity two-phase flow on the ground. Pressure drops of two-phase flow in microgravity were also measured experimentally and correlated successfully based on its characteristics. Two space experiments on pool boiling phenomena in microgravity were performed aboard the Chinese recoverable satellites. Steady pool boiling of R113 on a thin wire with a temperature-controlled heating method was studied aboard RS-22, while quasi-steady pool boiling of FC-72 on a plate was studied aboard SJ-8. Ground-based experiments were also performed both in normal gravity and in short-term microgravity in the drop tower Beijing. Only slight enhancement of heat transfer was observed in the wire case, while enhancement in low heat flux and deterioration in high heat flux were observed in the plate case. Lateral motions of vapor bubbles were observed before their departure in microgravity. The relationship between bubble behavior and heat transfer on plate was analyzed. A semi-theoretical model was also proposed for predicting the bubble departure diameter during pool boiling on wires. The results obtained here are intended to become a powerful aid for further investigation in the present discipline and development of two-phase systems for space applications.     

300#研究堆寿期内上联箱铝材中子注量分析

材料在辐照过程中所受的中子注量是辐照性能研究中的一个重要参数。上联箱铝材作为300#研究堆关键结构材料,经历了从反应堆首次临界到退役的全过程,极具材料辐照效应研究价值。为获取整个反应堆运行寿期内的上联箱中子注量水平,须克服堆芯装载变化频繁与堆芯不断扩大装载两大关键难点,故提出了堆芯归并等效计算方法。通过该方法的成功应用,得到了300#研究堆寿期内上联箱铝材的中子注量,并进行了误差分析。     

MSC Pool组网与传统组网的位置更新比较

简要介绍了传统组网和MSC Pool的技术原理及组网方式;对比分析了这2种组网方式下的3种位置更新,即移动台的位置更新、用户跨MSC Pool的位置更新及周期性位置更新;说明了MSC Pool组网方式较传统组网方式因消除了池内跨局位置更新,从而更好地释放了HLR和MSC的处理能力,提高了通信网络的可靠性和可用性。     

A hybrid metaheuristic approach to solving the UBQP problem

This paper presents a hybrid metaheuristic approach (HMA) for solving the unconstrained binary quadratic programming (UBQP) problem. By incorporating a tabu search procedure into the framework of evolutionary algorithms, the proposed approach exhibits several distinguishing features, including a diversification-based combination operator and a distance-and-quality based replacement criterion for pool updating. The proposed algorithm is able to easily obtain the best known solutions for 31 large random instances up to 7000 variables (which no previous algorithm has done) and find new best solutions for three of nine instances derived from the set-partitioning problem, demonstrating the efficacy of our proposed algorithm in terms of both solution quality and computational efficiency. Furthermore, some key elements and properties of the HMA algorithm are also analyzed.