基于软件无线电的突发模式8DPSK的全数字化实现

提出了一种软件无线电中频收发机的结构和突发模式 8DPSK解调的实现框架 ,在 8DPSK解调时采用了前向初始参数估计算法 ,并证实了该算法的可行性。     

组合模型在用水量预测中的应用

鉴于一个地区用水量的复杂性和非线性的特征,分别采用灰色预测模型、Logistic模型和龚帕茨模型预测成都市城市用水量.通过进行冗余检验,灰色预测模型是冗余方法,剔除冗余方法后,对Logistic模型和龚帕茨模型采用最小化方差的办法进行权重分配,建立了成都市用水量的组合预测模型.结果表明:与单项预测模型相比,组合模型的预测精度高,预测结果更加可靠.     

GE 90-30冗余PLC在水电厂监控系统中的应用

文章详细介绍了GE Fanuc系列90-30 PLC和VersaMax的I/O模块构成的双Genius网络控制系统在水电站计算机监控系统中的应用。     

中国软件产品开发的价值导向——中国IT企业软件开发决策标准的实证分析

需求分析直接影响软件的最终价值。不同的利益相关者对软件需求有不同的理解，这些冲突增加了软件需求分析的难度。我们把这些关键群体的价值导向分成企业、产品、项目这三个视角，以中国本土IT企业、服务国际市场的中国IT企业以及外资IT企业这三类企业为实证对象，通过问卷与访谈调查，分析中国软件开发需求分析中的决策标准，并与之前国际上的类似研究结果进行比较，了解中国软件产品开发的价值导向，以及与国际上的异同之处。     

Estimating most productive scale size with stochastic data in data envelopment analysis

This article estimates most productive scale size in stochastic data envelopment analysis (DEA). Jahanshahloo and Khodabakhshi [Jahanshahloo, G.R. and Khodabakhshi, M., Using input–output orientation model for determining most productive scale size in DEA. Applied Mathematics and Computation 2003, 146(2–3), 849–855.] studied most productive scale size in classic data envelopment analysis. The classic data envelopment analysis requires that the values for all inputs and outputs be known exactly. However, this assumption may not be true, because data in many real applications cannot be precisely measured. One of the important methods to deal with imprecise data is considering stochastic data in DEA. Therefore, this research studies most productive scale size with considering stochastic data in DEA. To that end, input–output orientation model introduced in Jahanshahloo and Khodabakhshi [Jahanshahloo, G.R. and Khodabakhshi, M., Using input–output orientation model for determining most productive scale size in DEA. Applied Mathematics and Computation 2003, 146(2–3), 849–855.] is extended in stochastic data envelopment analysis. To solve the stochastic model, a deterministic equivalent is obtained. Although the deterministic equivalent is non-linear, it can be converted to a quadratic program. Furthermore, data of software companies is used to apply the proposed approach. Performance of software companies are evaluated based on their scale sizes in classic and stochastic data envelopment analysis.     

IP QoS仿真软件的设计与实现

本文简单分析了ＩＰＱｏＳ的数学模型，详细介绍了ＩＰＱｏＳ仿真的模型建立、设计方法和实现中应注意的问题，最后给出了仿真结果和误差处理方法。     

TSR程序设计及运行中的问题和解决办法

本文论述了ＴＳＲ程序设计及运行中产生的一些问题，并提出了相应的解决办法。     

公伯峡水电站调速器的交叉冗余实现方案

介绍了公伯峡水电站（5×300MW）微机调速器的交叉冗余实现方案、双机切换原则和切换方法，同时指出了双可编程逻辑控制器（PLC）微机调速器在国内大型、巨型水轮发电机组上运行的可行性。     

Time as symbolic currency in knowledge work

The paper discusses the issue of time slips in software development. Increasing time sacrifices toward work constitutes an important part of modern organizational environment. In fact, the reign over time is a crucial element in controlling the labor process. Yet a lack of cultural studies covering different approaches to this issue remains—particularly those focusing on high-skilled salaried workers.This article is a small attempt to fill this gap, based on an analysis of unstructured qualitative interviews with high-tech professionals from a B2B software company. It focuses on the issue of timing in IT projects, as perceived by software engineers. The findings indicate that managerial interruptions in work play an important part in the social construction of delays. However, interruptions from peer software engineers are not perceived as disruptive. This leads to the conclusion that time is used in a symbolic way, both for organizational domination and solidarity rituals. The use of time as a symbolic currency in knowledge-work rites is presented as often influencing the very process of labor and schedules. It is revealed to be the dominant evaluation factor, replacing the officially used measures, such as efficiency, or quality.     

Firm characteristics and selection of international accounting software

We report the results of a survey of international U.S. companies focused on the selection of international accounting software. We investigate the relationships among firm characteristics (size and degree of internationalization), international features of accounting software (multicurrency, multireporting, and multilingual), and general selection criteria (support and security, hardware and operating platforms, and flexibility and cost). We find that firms’ reported preferences for international features differ depending on size and degree of internationalization. However, the relationship between firm characteristics and general selection criteria is not significant. The implication from our results is that firm characteristics should be an important consideration in the selection and design of international accounting software.