3G业务体系介绍

作为未来移动通信发展的方向，3G在业务能力，承载和开发平台，可提供的业务种类，都比传统的2G系统有了质的飞跃和提高。3G业务特性是3G标准化和系统中的最具特色的部分。本文以3GPP R99标准为例，介绍了下3G的业务体系结构。     

Performance and applications of the UVscope instrument

UVscope is a portable multi-pixels photon detector developed at IASF-Pa to support experimental activities in the high-energy astrophysics and cosmic rays field. The instrument, working in single photon counting mode, is designed to directly measure light flux in the wavelengths range 300-650 nm. Thanks to its features and operational flexibility, the instrument can be used in a wide field of applications where the knowledge of the environmental luminosity is required, as in the characterization of sites for ground-based Cherenkov and fluorescence telescopes, and for cross-calibration of their cameras.The present version of UVscope is based on a Multi Anode Photo Multiplier Tube and it is completed by a motorized mount and a filter wheel which allow to make low-light measurements, at programmed pointing directions and at different filter wavelengths. In this paper, the instrument is firstly presented in all its components; then the procedures adopted for its absolute and relative calibration are detailed. The performance of UVscope is evaluated and, finally, current and planned scientific applications are described.     

结构独立开放并有QoS保证的异构无线网漫游方案

未来移动通信将包含多种不同的无线网络存取技术与标准 ,移动终端如何运转在不同的无线网络系统下 ,如何使用不同的无线存取技术 ( UMTS,cdma2 0 0 0 ,GSM/GPRS,WLAN,WPAN等 ) ,这是本篇要考虑的问题。并提出了一个结构独立开放并有 Qo S保证的基于 All- IP的异构无线网漫游方案     

Early warning for VHE gamma-ray flares with the ARGO-YBJ detector

Detecting and monitoring emissions from flaring gamma-ray sources in the very-high-energy (VHE, > 100 GeV) band is a very important topic in gamma-ray astronomy. The ARGO-YBJ detector is characterized by a high duty cycle and a wide field of view. Therefore, it is particularly capable of detecting flares from extragalactic objects. Based on fast reconstruction and analysis, real-time monitoring of 33 selected VHE extragalactic sources is implemented. Flares exceeding a specific threshold are reported timely, hence enabling the follow-up observation of these objects using more sensitive detectors, such as Cherenkov telescopes.     

无皂乳液VAC/DMC/VHE-水泥基复合材料的性能研究

研究了无皂乳液醋酸乙烯酯(VAC)/甲基丙烯酰氧乙基三甲基氯化铵(DMC)/乙烯基羟丁基醚与水泥共混所形成的水泥基复合材料的性能。研究发现,聚灰比为5%或10%时,该复合材料的抗折强度都有相应的提高,而抗压强度变化不大。与较早研究的2种无皂乳液与水泥共混所形成的复合材料比较,有更好的性能。     

下一代网络中基于代理技术的VHE业务平台

在介绍下一代网络及虚拟归属环境(VHE,virtual home environment)概念的基础上,提出一种基于代理技术的VHE业务平台。该业务平台可以统一管理增值业务及用户数据,同时实现了VHE的概念,可以为用户提供VHE环境。另外,首次细化了用于实现VHE概念的代理粒度,同时提出了一些策略,优化VHE业务平台的实现。     

基于OSA/Parlay的多媒体个人移动业务管理系统研究与实现

主要讨论了基于OSA/Parlay标准的业务管理系统,特别是计费和账务系统.分析了OSA的体系结构、VHE模型和网络互连技术,讨论了组成OSA的三大模块和业务管理流程.在此基础上,给出个人多媒体移动业务管理模型原型系统,分析了系统中每个模块的功能以及系统中数据库的构造和关系.讨论了采用XML Web Service技术进行系统的实现.     

基于代理的VHE业务体系结构

将移动代理技术应用于网络业务的提供，提出一种基于代理的未来移动网业务体系结构，详细阐述了该结构的VHE业务提供机制和网络适配技术，并简要说明了系统设计方法。     

GETFOCOS for imaging atmospheric Cherenkov telescopes—A GEant4 tool for optimization and characterization of an optical system

The aim of this article is to introduce a dedicated simulation package, named GETFOCOS, that combines Geant4 and ray-tracing algorithms that can be used on the characterization of the optics of a generic Imaging Atmospheric Cherenkov telescope as well as on the optimization of its focal plane geometry. The image spot size is evaluated for both cases in a large field-of-view observation scenario. This tool allows to perform fast but precise tests for different optical options. The specific case of a Fresnel lens, inspired by the concept developed for the GAW experiment, is analysed. However, this intends to be an universal and relevant tool for any kind of optical system. A complete characterization of the optics is presented together with a study for the optimization of the focal plane shape.     

VHE系统中的业务适配性研究

VHE(虚拟本地环境)作为3G业务提供方式之一,逐渐成为研究的热点,但业务适配机制作为VHE系统中的核心问题之一,尚缺乏切实可行的解决方案.本文分析了VHE系统对业务适配性的需求,提出了一种满足VHE系统要求的业务内容适配解决方案--基于移动代理的适配实现机制,提高了VHE系统的效率.