E-book的发展历程

简要介绍了E-book在美国、德国、日本、法国的发展历程，特别介绍了E-book在我国迅猛发展的现状。     

基于流技术的网络课件设计

本文分析了目前网络课件的现状，介绍了流媒体和流技术的基本概念，讨论了利用流技术开发网络课件的基本思路和方法，从而给出了一个流式网络课件开发的基本模式。     

On the complexity of the one-terminal network design problem

The one-terminal network design problem considered here is to select a subset of the set of potential edges so as to minimize the sum of construction cost plus expected usage cost with discounting. We distinguish between easy and hard cases of this problem.     

A new technique to characterize mono-molecular micelles in random ethylene–propylene copolymers

A new technique to investigate the nano-structure of ethylene–propylene (EP) random copolymers has been developed. It consists in the measurement of the turbidity which develops at a lower critical solution temperature (LCST) in pentane solutions. The information on the solution comes from different types of turbidity obtained during a step-by-step temperature increase. The transient turbidity (h_i) is associated with random coils (I) and structured coils (II) while the stable turbidity comes from aggregates (III). The proportion of (I), (II) and (III) depends on the solution history and on the solvent. The M_w distribution can be obtained from the set h_i (T_i) of (I). Turbidity (II) has an unexpected gap in the h_i (T_i) trace. The gap (10–20 K) is explained by the presence of two entities in solution. Their temperatures of phase separation permit their identification as monomolecular micelles, whose outer core is either E-rich or P-rich. This nano-structure is thought to exist in the solid and also in solution as a metastable state. The technique can differentiate between mobile chains in solutions (I, II) and attached chains in a network (III) through the sedimentation behaviour of the concentrated phase. Three samples with a similar (EP) content (0.75) made with different catalysts have been analysed by LCST and slow calorimetry.     

Ad Hoc 无线网络中多媒体信息传输控制研究

通过对Ad Hoc无线网络中多媒体信息的传输控制方式进行了分析，对时间敏感的多媒体信息的轮询控制方式提出了一种对轮询控制进行改进的方法，将传输服务与转移查询做并行处理。然后，采用嵌入马尔可夫链和概率母函数的分析方法，建立了改进系统和原系统的数学模型，分析了平均等待时延，结合语音信息和视频信息的传输，说明了改进系统具有更好的性能。     

浅谈细胞因子网络性

细胞因子是在机体炎症和免疫应答中 ,由免疫细胞产生的一类具有调节与效应功能的小分子多肽或蛋白。它作为细胞间的信号在免疫应答中起作用。细胞因子在非特异性免疫中称单核因子 ,在特异性免疫中又可叫淋巴因子。细胞因子根据其功能的不同可分好多种 ,但不同的细胞因子并不是单一存在 ,它们互相之间相辅相成 ,共同作用 ,使机体处于一个相对稳定的状态。本文即从细胞因子的产生、功能、受体类型等方面论述细胞因子的网络性     

电子阅览室安全管理与对策

本文分析了影响电子阅览室安全运行的两个重要因素：1、网络安全因素；2、读者因素。并提出了相应的对策。     

ABR业务在ATM网中的传输控制

ABR业务适宜Web信息的传输 ,是ATM网中惟一提供端 -端反馈控制策略的业务 本文讨论与拥塞控制有关的因素、ABR业务参数 对用于ABR业务的传输控制方法及正在开展的一些研究进行分析并提出改进方法     

Buffer Overflow Probabilities for a Markov-Modulated Fluid Model

Markov modulated fluid models are widely used in modelling communications and computer systems. In the AMS (Annick, Mitra, Sohndi) model, heterogeneous, bursty sources modeled by multidimensional Markov processes are superimposed or multiplexed together to drive a fluid buffer. The performance of the system is measured by the steady state probability that the buffer exceeds a high level. The exact solution to this problem derived by AMS requires too much computation to be used on-line. Here we derive an upper bound for the above probability which is fast to compute and accurate enough for practical use.     

Investigating ego modules involved in TGFβ3-induced chondrogenesis in mesenchymal stem cells based on ego network

ObjectiveThis paper aimed to investigate ego modules for TGFβ3-induced chondrogenesis in mesenchymal stem cells (MSCs) using ego network algorithm.MethodsThe ego network algorithm comprised three parts, extracting differential expression network (DEN) based on gene expression data and protein-protein interaction (PPI) data; exploring ego genes by reweighting DEN; and searching ego modules by ego gene expansions. Subsequently, permutation test was carried out to evaluate the statistical significance of the ego modules. Finally, pathway enrichment analysis was conducted to investigate ego pathways enriched by the ego modules.ResultsA total of 15 ego genes were obtained from the DEN, such as PSMA4, HNRNPM and WDR77. Starting with each ego genes, 15 candidate modules were gained. When setting the thresholds of the area under the receiver operating characteristics curve (AUC) ≥0.9 and gene size ≥4, three ego modules (Module 3, Module 8 and Module 14) were identified, and all of them had statistical significances between normal and TGFβ3-induced chondrogenesis in MSCs. By mapping module genes to confirmed pathway database, their ego pathways were detected, Cdc20:Phospho-APC/C mediated degradation of Cyclin A for Module 3, Mitotic G1-G1/S phases for Module 8, and mRNA Splicing for Module 14.ConclusionsWe have successfully identified three ego modules, evaluated their statistical significances and investigated their functional enriched ego pathways. The findings might provide potential biomarkers and give great insights to reveal molecular mechanism underlying this process.