认知无线电频谱切换技术研究

认知无线电技术是为提高频谱利用率,解决目前无线频谱资源紧缺问题而提出的,准确快速的频谱切换技术是其实现的关键。论文针对认知无线电技术的频谱切换问题,总结频谱切换的关键技术及研究模型,讨论频谱切换技术面临的挑战,以及频谱切换技术的研究方向。     

移动流媒体业务质量评估及监测方案探讨

文章针对在移动流媒体业务运维中存在的各种难点,深入分析网络现状和业务特性,提出了基于用户体验的质量评价体系,探讨了全程全网的数据采集和分析方案,设计了自动化的业务监测评估工具,为实现对端到端3G数据业务的智能管控和优化做出了有益尝试。     

浅析航运企业IT服务管理

航运企业具有规模巨大、分支广泛、信息数据海量的特点。为了解决在IT服务过程中面临的挑战和存在的问题,企业需要根据自身特点,按照确定愿景目标、评估现状、确定目标与范围、设计与实施、持续改进这5个步骤建立一套IT服务管理体系,并在相应的基于ITILV3的IT服务管理平台支撑下,按照初期、中期、远期三个阶段循序渐近地实施和持续改进。     

企业服务总线技术在指挥调度系统集成中的应用

面向服务的体系结构(SOA)已经逐渐成为IT集成的主流技术,企业服务总线(ESB)是实践SOA思想的一个基础设施.本文通过对ESB技术的主要原理的阐述,以及对现有指挥调度系统集成中的需求的分析,来描述如何通过ESB技术来集成遗留系统以及新系统,解决新一代调度指挥面临的信息系统集成.     

Fast phase switching within the bunch train of the PHIN photo-injector at CERN using fiber-optic modulators on the drive laser

The future Compact Linear Collider (CLIC) e⁻/e⁺ collider is based on the two-beam acceleration concept, whereby interleaving electron bunches of the drive beam through a delay loop and combiner rings as well as high peak RF power at 12 GHz are created locally to accelerate a second beam, the main beam. One of the main objectives of the currently operational CLIC Test Facility (CTF3) is to demonstrate beam combination from 1.5 GHz to 12 GHz, which requires satellite-free fast phase-switching of the drive beam with sub-ns speed. The PHIN photo-injector, with the photo-injector laser, provides flexibility in the time structure of the electron bunches produced, by direct manipulation of the laser pulses. A novel fiber modulator-based phase-switching technique allows clean and fast phase-switch at 1.5 GHz. This paper describes the switching system based on fiber-optic modulators, and the measurements carried out on both the laser and the electron beam to verify the scheme.     

国内外服务认证发展综述

近年来,伴随着全球由“工业经济”向“服务经济”转型,以及服务贸易的迅速发展,服务认证作为一种保证服务质量,促进服务业和服务贸易发展的重要手段已被世界上越来越多的国家和地区接受,成为国际惯例。文章从分析国际、国内服务认证发展现状入手,在此基础上提出了我国开展服务认证的建议。     

基于云计算的高校图书馆文献传递探究

文献传递服务以低廉的成本满足了用户的文献信息需求的优势有道了图书馆借的关注与重视。云计算的核心特色以集体的力量为每一个成员提供服务,就文献传递而言,它们就拥有高度契合的基于资源共建、共知、共享的服务理念。为此,通过对文献传递实际工作的经验总结,结合计算领域的云计算前沿理念,为文献传递服务设计一个机遇云计算的服务平台系统,为图书馆界提供云计算技术应用的探索尝试。     

服务型政府下的城乡规划管理市场化改革

顺应我国经济、政治和社会的发展,政府必然从经济上的建设型政府、管理上的管制型政府向以公共管理为主的服务型政府转型。城乡规划作为政府的一项重要公共政策,一直是以主动、全面管理为主。如何顺应服务型政府在职能上的需求,通过市场化改革,逐步放权,以更好地发挥市场在城市建设中的资源调节作用,加强市场竞争对城市发展的促进作用,是我国需要探讨的重要问题。研究通过分析我国经济发展趋势、服务型政府主要特色及现有城乡规划管理审批、决策、评价等面临的主要问题,分析市场化改革的特色、目标与多样性,从渐进式、突变式两方面探讨了市场化改革实施路径。     

A study of the negotiated-settlement practice in regulation: Some evidence from Florida

Negotiated settlements have become a frequently used alternative to contested proceedings when setting prices charged by public utilities under the US rate-of-return regulatory model. The behavior of the representatives of consumer advocates and the firms during settlement negotiations determine customer prices. This paper examines this behavior by using data from the Florida Public Service Commission to estimate the payoff functions of both parties. The estimation suggests that the advocate and the firm weight the present rate change more than the consumer's future average price and the firm's future operating revenue in their settlement decisions. It also indicates that the time saved by settlements is not a primary reason for their popularity.     

Labelling accuracy in Tasmanian seafood: An investigation using DNA barcoding

Mislabelling of seafood products has been documented in numerous countries for over three-quarters of a century. With a trend towards increased consumption of seafood, the informed consumer demands accurately labelled products that provide full disclosure of composition. DNA barcoding can be used to accurately identify a seafood product to species based on its genetic signature, and so provides a means to test the authenticity and accuracy of seafood labelling. This can be especially useful for products such as fillets which have few or no unambiguous identifying characters, and can easily be mislabelled. We investigated labelling accuracy in seafood retailers in Tasmania, Australia. Thirty-eight seafood products were obtained from seafood retailers, sequenced for the barcoding gene region cytochrome oxidase subunit 1(CO1), and subsequently identified to species level by querying GenBank and Barcode of Life Data Systems (BOLD) DNA sequence records. Results were compared with standard fish names (SFN) prescribed under the Australian Fish Names Standard (AFNS) and FishBase. Of the 38 samples, none were deemed to have been mislabelled under Australian regulation, although in some cases naming discrepancies and ambiguity may cause confusion for some consumers. Our work, while reflecting high standards in Tasmanian seafood, highlights the need for mandatory standard labelling across all seafood products so as to eliminate any possible misrepresentation.