FORTRAN语言及汇编语言在坐标测量中的混合编程技术

本文论述了Fortran在坐标测量数据采集系统以及图形输出系统中与汇编语言的程序连接及调用方法,讨论了利用Fortran语言进行测量样本点的拟合、画线以及图形输出问题,给出了编程方法及实例。     

基于软件无线电技术的第三代移动通信

简要介绍了软件无线电的概念 ,并较详细探讨了软件无线电在第三代移动通信系统的计算机化、实时操作系统、智能天线和移动终端方面的应用。     

基于极限编程的软件质量管理

极限编程是一种轻量型、敏捷软件开发方法,它尤其适于中小软件企业。文章探讨了在极限编程架构中如何开展软件质量管理,并指出了极限编程对于我国软件行业的指导意义和应用前景。     

基于非线性规划的企业销售利润优化模型

针对企业销售利润最优化问题,分析了相关概念和相互之间的关系,以企业销售利润为目标函数,建立了非线性规划模型,说明了约束条件的构成,最后以实例对提出的模型进行了详细说明,有助于企业销售管理决策,具有一定的应用价值。     

Does Social Software Support Service Innovation?

Recent Internet technologies and web‐based applications, such as social software, are being increasingly applied in firms. Social software can be employed for knowledge management and for external communication enabling access to internal and external knowledge. Knowledge, in turn, constitutes one of the main inputs to service innovation. Hence, social software has the potential to support service innovation. Using data from German IT and knowledge‐intensive service firms, this is the first paper that empirically analyses whether the use of social software applications triggers innovation. It refers to a knowledge production function in which social software use constitutes the knowledge sourcing activity. The results reveal a positive relationship between social software and service innovation. Since this result is robust when controlling for former innovative activities and the previous propensity to adopt new technologies and to change processes, the analysis suggests that the causality runs from social software to innovation.     

Application controlled caching for web servers

Today's web servers must have the ability to deal with large data sets, and their performance mainly depends on the control mechanism of the disc cache. Though the cache replacement algorithms in operating systems generally perform well, application-specific policies can often perform much better. In this paper, we present the application-controlled caching in user space (ACCUS) mechanism for web server disc caching. With this mechanism, an application can schedule the service requests based on the cache status of the requested files to improve its performance so that the system can gain a high parallelism of CPU processing, networking I/O and disc I/O. An application can service the cached files with a higher priority to the ones not cached, which helps reduce the latency caused by disc I/O blocking. Meanwhile, the application can enforce a policy for domain-specific cache management to obtain a higher cache hit ratio. ACCUS is implemented in two web servers of different models, Flash and userver. Despite the great differences in architectures, the empirical results show that both servers can achieve high throughput under heavy workloads with ACCUS enabled. Performance analysis for two other typical web servers, Apache? and Zeus Web Server are also conducted and the results indicate that ACCUS can achieve significant improvement in performance.     

陕西软件龙头企业成长状况分析与对策研究

软件龙头企业在软件产业化经营中具有关键作用,文章对陕西软件龙头企业成长状况及其存在的问题与差距进行分析,探讨陕西软件龙头企业实现快速健康可持续发展的对策。     

基于滚动时域优化的高速铁路车站到发线动态调整研究

高速铁路车站到发线动态调整是调度指挥工作的重点之一,具有复杂多变、实时性强的特点,亟需实现到发线调整的自动化和智能化。阐述高速铁路车站到发线动态调整问题本质,引入滚动时域调度策略,建立高速铁路车站到发线动态调整模型。该模型为以列车晚点总时长最小为目标的0-1整数规划模型,采用遗传算法求解。以某高速铁路车站为例,根据列车运行图中列车到发时刻和晚点信息进行计算。研究结果表明:该模型可以有效提高到发线调整的实时性,保障列车在车站内稳定运行,为高速铁路车站智能调度提供了研究支持。     

Rapid internationalization of emerging market firms—The role of geographic diversity and added cultural distance

In this study, we examine drivers of internationalization speed of emerging market multinational enterprises who have been known to internationalize rapidly, even to culturally distant countries. Drawing on the organizational learning theory, we argue that, devoid of a pre-existing knowledge base before they begin their international expansion, these firms are unencumbered by the pathologies and traps that are likely to slow a firm with pre-existing knowledge. We posit inverted U-shaped relationships between geographic scope and added cultural distance on the one hand, and internationalization speed of Indian software multinationals, on the other hand. We also hypothesize a moderating effect of the regularity of added cultural distance on the relationship between added cultural distance and internationalization speed. Our analyses of 650 internationalization expansions of 32 largest Indian software firms over a ten-year period support our hypotheses.