HF通信网中的突发自适应选频技术

介绍了突发自适应选频技术在ＨＦ通信网中的应用，分析了突发自适应选频的特点及网络应用的优势，设计了一套用于网络突发选频的协议，讨论了协议中的重要参数设定和协议性能，并提出了多种方案供优化     

IDPT──一个可互操作的数据库平台

构造可互操作的数据库平台，是目前在计算机网络环境下实现异种数据库互操作性的一种有效途径。数据库互操作性必须提供对远程数据库资源的透明访问，并隐藏异种数据库系统间的差异。按照这样的原则，提出一种基于客户／服务器体系结构来实现可互操作数据库平台的方案。该方案首次将ＯＤＰ的交易技术引入到数据库互操作性的实现中，较好地解决了透明性和可扩展性的问题。文中将主要介绍ＩＤＰＴ的体系结构、交易器的功能、上下文空间及服务代理。     

入世后我国农业扶持政策存在的问题与对策

文章对我国农业扶持政策的现状和存在问题进行全面剖析,通过研究得出:政府对农业扶持力度在加大的同时也存在不合理方面,如关税设置不合理,"绿箱"支持结构严重扭曲,支农效率低下等。在WTO框架下,在借鉴发达国家农业扶持政策的基础上,为提高我国农产品竞争力和增加农民收入,提出建立完善的我国农业扶持政策的具体对策。     

电信产业的价格竞争模型与接入费水平

互联互通之后，信息产业部对接入费水平的制定原则是接入费水平基于接入成本．主要讨论如何把握这个原则的问题．通过建立两个电信运营商的价格竞争模型，分析比较价格竞争之前和价格竞争之后各个运营商的状况，从而为研究此类问题提供一种新的思路．     

PCS网络中一种改进的呼叫建立算法

PCS系统中,用户漫游到非归属VLR覆盖区被呼时,系统将产生大量信令开销和数据库访问开销。该文为移动用户被呼提出了一种改进的缓冲呼叫算法来降低网络信令开销与数据库访问负荷和呼叫建立时延,建立了一种模型来分析其相关性能。与传统呼叫算法相比,改进呼叫算法能极大降低系统开销,具有较强的可行性。     

Microdata Access and Labor Market Research: The U. S. Experience

Summary: The paper illustrates the value of broad researcher access to survey and administrative microdata using examples drawn from the U. S. experience, outlining how analyses of trends in earnings inequality, poverty and employment dynamics using such data have benefited policy makers and contributed to improvements in statistical agency data products. Methods of facilitating researcher access, including the release of public use files, the use of licensing agreements, and the establishment of research data centers, are discussed. * The author thanks Anne Polivka, Marilyn Seastrom and two anonymous referees for helpful comments on an earlier draft of the paper.     

论完善注册会计师及相关特种执业资格准入机制

现有法律、法规及规章没有规定资产评估机构、房地产估价机构、造价工程师执业机构的准入条件,各特种执业资格准入机制存在准入条件相差较大,个别执业资格准入条件偏低,准入考试内容设置不合理等缺陷。应提高注册会计师及相关特种执业资格准入条件,合理设置准入考试或考察内容,建立会计师事务所各特种执业资格注册管理制度。     

一种双层小区结构中的切换控制策略

在宽带码分多址双层小区结构系统中提出了一种基于小区覆盖范围和信号能干比判决的切换策略,切换策略使用了基于概率的动态资源预留方案,即在切换时,如果系统中没有空闲资源,则对切换呼叫进行排队。通过仿真表明,该切换策略相对于采用固定资源预留的切换策略,在轻负荷的条件下对话音呼叫的阻塞概率有一定的改善。     

Cultural Anthropology and Open Access—Interview With Dominic Boyer,Cymene Howe,and Marcel LaFlamme

Abstract

In this installment of “Conversations,” Dominic Boyer, Cymene Howe, and Marcel LaFlamme, of the Cultural Anthropology editorial team, discuss the ins and outs of publishing a gold open access journal in the field of anthropology. Highlights of the discussion include Cultural Anthropology’s move to open access, the ethics of open access, the growth of international readership, ongoing publishing challenges in open access, and the role libraries can play with open access publishing.     

Preserving Open Access

Abstract

Libraries have an established track record of preserving the scholarly record, but this stewardship role has generally been exercised over materials the library has purchased or otherwise acquired. With open access publishing, the library’s role in preservation is less certain, as libraries may facilitate access to a wide array of freely accessible materials without ever obtaining any copies. Additionally, the open access landscape includes many small noncommercial publishers with limited resources that may not be able to invest in long term preservation and access. In this column, Courtney McAllister, Electronic Resources Librarian at Lillian Goldman Law Library, Yale University, discusses preservation concerns and strategies for open access publications and how libraries may be affected by unstable or unpredictable long-term access.