The <Emphasis Type="Italic">M</Emphasis>/<Emphasis Type="Italic">G</Emphasis>/∞ system revisited: finiteness,summability, long range dependence,and reverse engineering

We explore M/G/∞ systems ‘fed’ by Poissonian inflows with infinite arrival rates. Three processes – corresponding to the system's state, workload, and queue-size – are studied and analyzed. Closed form formulae characterizing the system's stationary structure and correlation structure are derived. And, the issues of queue finiteness, workload summability, and Long Range Dependence are investigated. We then turn to devise a ‘reverse engineering’ scheme for the design of the system's correlation structure. Namely: how to construct an M/G/∞ system with a pre-desired ‘target’ workload/queue auto-covariance function. The ‘reverse engineering’ scheme is applied to various examples, including ones with infinite queues and non-summable workloads. AMS Subject Classifications Primary: 60K25; Secondary: 60G55, 60G10     

Design and synthesis of boron containing 2,4-disubstituted-phthalazin-1(2H)-one and 3,7-disubstituted-2H-benzo[b][1,4] oxazine derivatives as potential HGF-mimetic agents

We synthesized boron containing 2-(4-methoxybenzyl)-4-(4-(4,4,5,5-tetramethyl-1,3,2-dioaborolan-2-yl)phenyl) phthalazin-1(2H)-one 3 and 7-methyl-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-2H-benzo[b][1,4] oxazine 8. The reaction of compound 2 with B₂pin₂ using potassium acetate as the base and Pd(PPh₃)₂Cl₂ as the catalyst, produced the corresponding boron-containing derivative 3 as a white solid in 65% yield. Alternatively, we have synthesized compound 8 as a yellow solid in 59% yield using the Miyaura borylation reaction. The potassium trifluoro(4-(-methyl-2H-benzo[b][1,4]oxazine-3-yl)phenylborate 9 was then obtained after treatment of 8 with aqueous solution of KF₂H in methanol as white solid product in 60% yield. The biological activities of the synthetic compounds are currently being evaluated.     

Long‐range corrected density functionals combined with local response dispersion: A promising method for weak interactions

Density functional theory, in general, is considered to underestimate the weak van der Waals type of intermolecular interactions. We optimized parameters of the local response dispersion (LRD) method applied to the long‐range corrected exchange‐correlation functionals (LC‐BOP12+LRD and LCgau‐BOP+LRD) on the interaction energy for the complexes in the recently compiled S66 database and found to be comparable with the high‐level wave function‐based methods reported in ?ezá? et al. (J. Chem. Theory Comput. 2011 , 7, 2427). Our calculations with the S66 intermolecular complexes at equilibrium geometries suggests that the LC‐BOP12+LRD and LCgau‐BOP+LRD are well‐balanced and lower cost alternatives to the methods reported in the database. Further, test on the S66X8 database (with eight nonequilibrium points) and the HBC6 and NBC10 database shows LC+LRD method with newly optimized parameters is a promising candidate for dealing such weak interactions. Finally, the new parameterized LC+LRD method was tested on X40 benchmark halogenated complexes.Copyright © 2013 Wiley Periodicals, Inc.     

小波在长相关流量工程中的应用

通过回顾现有的其他网络流量技术,分析了小波在长相关流量工程中的应用,通过比较,讨论了基于小波的流量模型的优势,并预测了小波在未来流量工程研究中的发展方向。     

自相似业务流建模及其合成性能分析

基于通信网络仿真软件平台OPNET中的RPG模型，本文实现了一个通用的、与协议无关的自相似业务流发生模型，并通过仿真实验和小波分析的方法验证了该模型的正确性和可用性。在此模型的基础上，着重对自相似业务流合成过程的性能和行为特性进行了大量的实验和分析。研究结果表明，自相似业务流的合成过程仍具有自相似性，而且合成流的自相似参数接近于各独立输入业务流中所具有的最大自相似参数。     

一种以太网流量的仿真方法

分析了以太网流量具有的自相似性和长相关性,并提出了详细的仿真方法用于产生具有这些特性的以太网流量.该软件方法基于ON/OFF模型和Pareto分布,提供了一种广泛适用的流量生成模型,其接口简单且易于定制.试验证明了该方法具有预期性能.     

长期相关过程的自相关对排队性能的影响

近年来,长期相关性对ＡＴＭ网的建模和控制影响还存在分歧。本文研究了ＬＲＤ过程的二阶编计特性排队的影响,认为它受缓大小及利用率的控制。通过仿真给出了结论,并从理论上进行了论证,最后,针对建模提出了建议。     

基于离散小波变换的网络流量多重分形模型

网络流量过程中所蕴含的分形尺度特性对网络性能有显著的影响。因此研究能全面准确地刻画网络流量过程在小时间／空间尺度上的复杂奇异性特征和大时间／空间尺度上的长程依赖性特征的流量模型对Internet网络工程有重要的意义。本文对实测的流量数据(从著名的校园网和国内著名的ISP)进行了分析，利用小波技术构建了一个新的网络流量的多重分形模型，通过模拟验证，发现该新模型能以较简洁的形式捕捉实际网络流量特性，并具有刻画真实流量数据中的多重分形特征的能力。