即时通讯软件的安全性分析

在互联网服务中,即时通讯已成为了最流行的服务模式之一,人们对即时通讯的依赖程度也与日俱增。但是, 频频出现的病毒和黑客攻击使广大用户深受其害,即时通讯的安全问题也日益严峻。为了从根本上解决问题,本文对即时通讯软件的架构和协议进行了深入分析,目的是找出漏洞根源,给开发者和使用者提供防止漏洞的依据。     

pH‐Disintegrable Polyelectrolyte Multilayer‐Coated Mesoporous Silica Nanoparticles Exhibiting Triggered Co‐Release of Cisplatin and Model Drug Molecules

We report on the fabrication of pH‐disintegrable polyelectrolyte multilayer‐coated mesoporous silica nanoparticles (MSN) capable of triggered co‐release of cisplatin and model drug molecules. The outer polyelectrolyte multilayer was assembled from permanently cationic polyelectrolyte, poly(allyl amine hydrochloride) (PAH), and negatively charged polyelectrolyte, P(DMA‐co‐TPAMA), consisting of N,N‐dimethylacrylamide (DMA) and 3,4,5,6‐tetrahydrophthalic anhydride‐functionalized N‐(3‐aminopropyl)methacrylamide (TPAMA) monomer units, which exhibits pH‐induced charge conversion characteristics. Thus, the subtle alteration of solution pH from 7.4 to ≈5–6 can lead to the disintegration of outer polyelectrolyte multilayers, accompanied with the co‐release of cisplatin and RhB.

     

基于凝聚子群分析的MSN监控系统

论文将社会网络的派系分析思想引入到MSN通信系统的内容过滤和分析中,从社会网络分析中凝聚子群的角度对以MSN构成的网络进行详细的分析,通过对凝聚子群和关键节点的分析,提取派系划分,派系首领和重要参与者等有效信息,以实现对MSN通信网络中不良内容的有效监控和阻断。     

基于动态MSN的软交换多业务环境性能研究

在下一代网络中将提供具有不同性能要求的语音、数据和多媒体业务,研究这些业务性能的相互影响并采用有效的方法保证这些业务的性能指标对下一代网络的成功实施具有重要意义.本文设计了一种多队列的软交换多业务控制框架,在此基础上提出并分析了一种动态最大会话数(MSN,Maximum Session Number)方法来分配系统资源,以有效利用系统资源确保业务性能.仿真结果表明:在软交换多业务环境中,采用动态MSN方法能确保系统的稳定性并有效地满足各种软交换业务的性能要求.     

Analysis of multivariate skew normal models with incomplete data

We establish computationally flexible methods and algorithms for the analysis of multivariate skew normal models when missing values occur in the data. To facilitate the computation and simplify the theoretic derivation, two auxiliary permutation matrices are incorporated into the model for the determination of observed and missing components of each observation. Under missing at random mechanisms, we formulate an analytically simple ECM algorithm for calculating parameter estimation and retrieving each missing value with a single-valued imputation. Gibbs sampling is used to perform a Bayesian inference on model parameters and to create multiple imputations for missing values. The proposed methodologies are illustrated through a real data set and comparisons are made with those obtained from fitting the normal counterparts.     

Grafting polymer nanoshell onto the exterior surface of mesoporous silica nanoparticles via surface reversible addition-fragmentation chain transfer polymerization

Reversible addition-fragmentation chain transfer (RAFT) functionalities were anchored to the exterior surface of mesoporous silica nanoparticles (MSNs) without changing the mesoporous structure, RAFT polymerization of styrene was subsequently conducted to graft polystyrene (PSt) onto the exterior surface of MSNs, forming a novel core-shell nanostructure with a mesoporous core and a polymer nanoshell. Fourier transform infrared spectroscopy (FT-IR), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA) were used to characterize the produced mesoporous core-shell nanostructure, the results showed that the thickness of the nanoshell increased with the increasing time of polymerization.     

Relocation algorithm for non-uniform distribution in Mobile Sensor Network

Energy is the determinant factor for the survival of Mobile Sensor Networks (MSN). Based on the analysis of the energy distribution in this paper, a two-phase relocation algorithm is proposed based on the balance between the energy provision and energy consumption distribution. Our main objectives are to maximize the coverage percentage and to minimize the total distance of node movements. This algorithm is designed to meet the requirement of non-uniform distribution network applications, to extend the lifetime of MSN and to simplify the design of the routing protocol. In addition, test results show the feasibility of our proposed relocation algorithm.     

典型城域网络的性能分析

本文主要对分布式排队双总线网，光纤分布式数据接口网和曼哈顿街区网等典型城域网的性能进行了研究。文中先简要论述了这些城域网的主要特征，然后对它们的吞吐量和可靠性进行了比较分析。     

Research on the algorithm for identifying VoIP session

In this letter, a novel algorithm is proposed for identification of one popular type of VoIP （Voice over IP） application, MSN VoIP, based on both behavior pattern and protocol characteristics. In addition, the experiment for validation is implemented. Since there exists no method identifying MSN VoIP session and furthermore the IP addresses, domain names, ports and even the protocols MSNP works over, are all alterable during the application, which makes it difficult to identify MSN VoIP session, this work will be helpful to advance the research on VoIP identification.