基于天然气放空系统的水力计算软件开发

高压天然气放空系统由放空干线管段气体、放空管线及外界大气组成。放空管路属于非稳定流动,其水力计算不能采用一般站场管路的达西公式。以Fano方程为基础,运用流体力学及输气管路流动基础理论进行程序编写,计算软件可实现对各时刻放空所对应的瞬时放空量、累计放空时间、截面压力及温度、储气量的求解。计算结果与图解法进行对比,误差控制在2%以内,弥补了图解法仅可求得瞬时放空量而无法得到其他参数的缺陷,并利用东河伴生气管线下沉工程现场放空数据与本计算软件对比,计算结果吻合度高,符合现场工程实际。     

Performance of acquirers of divested assets: Evidence from the U.S. software industry

We provide a comparative analysis of acquirer returns in acquisitions of public firms, private firms, and divested assets. On the basis of a sample of 5,079 acquisitions by U.S. software industry companies during 1988–2008, we find that acquisitions of divested assets outperform acquisitions of privately held firms, which in turn outperform acquisitions of publicly held firms. While the higher returns for acquisitions of divested assets relative to stand‐alone acquisition targets can be explained by market efficiency arguments, seller distress and improved asset fit further enhance the positive returns of acquirers of divested assets consistent with the relative bargaining power explanation. Finally, we find that the effects of these buyer bargaining advantages are mutually strengthening and that they also hold for longer‐term acquirer performance Copyright © 2013 John Wiley & Sons, Ltd.     

烟草企业内部沟通软件开发刍议

文章探讨了企业内部的沟通问题,说明了开发一款企业内部沟通软件的必要性。同时,介绍了企业内部沟通软件的主要功能和开发过程中的注意事项,以及企业内部沟通软件的使用前景。     

浅谈对电脑音乐制作及其课程设置的研究

随着世界的发展,社会的需求,电脑音乐制作技术是科学技术与音乐艺术发展相结合的产物,实施电脑音乐制作教学无论从社会需求和时代要求的角度来看,都是十分紧迫和艰巨的任务。本文对于电脑音乐制作的软件及教学课程改革都简单的进行了分析。     

中小型软件企业快速有效实施CMMI3的构想

CMMI是全球权威的软件能力成熟度模型,在中国方兴未艾。本文针对我国中小型软件企业的特点,结合笔者自身在CMMI3的启动、实施与持续改进工作中多年的探索研究和积累,试图提出一套快速有效的CMMI3实施方案,希望能够帮助那些准备或正在实施CMMI3以期降低成本、提升管理水平的企业,尽快达成目标。     

Advances in Joint Modelling: A Review of Recent Developments with Application to the Survival of End Stage Renal Disease Patients

The use of joint modelling approaches is becoming increasingly popular when an association exists between survival and longitudinal processes. Widely recognized for their gain in efficiency, joint models also offer a reduction in bias compared with naïve methods. With the increasing popularity comes a constantly expanding literature on joint modelling approaches. The aim of this paper is to give an overview of recent literature relating to joint models, in particular those that focus on the time‐to‐event survival process. A discussion is provided on the range of survival submodels that have been implemented in a joint modelling framework. A particular focus is given to the recent advancements in software used to build these models. Illustrated through the use of two different real‐life data examples that focus on the survival of end‐stage renal disease patients, the use of the JM and joineR packages within R are demonstrated. The possible future direction for this field of research is also discussed.     

合约变异在测试数据优化中的研究及应用

软件测试是保证Web服务质量的重要技术手段,测试数据生成是Web服务测试的重要内容,而生成的初始测试数据量大,数据冗余,为了减少初始测试数据数量,提高测试数据的有效性,本文在变异测试方法的基础上,使用合约变异方法对初始测试数据进行优化,据此可以生成一批达到一定变异充分度的有效测试数据,并通过实验验证了方法的有效性。     

基于校企合作模式的高职院校软件技术专业实训基地建设探索

分析了目前软件技术专业实训基地建设的必要性，提出了校企合作下的高职院校软件技术专业校内、校外实训基地建设、管理、运行模式和成效，探讨了建立校企合作实训基地要考虑和解决的问题。     

Industry-oriented enterprise resource planning

General purpose enterprise resource planning (ERP) systems have problems such as complex configuration processes, low adaptation to specific industries, and an extensive implementation time period. In order to alleviate these issues, this paper proposes the concept of industry-oriented ERP (IERP) and a component-based approach to IERP development. This paper also presents the framework of developing IERP in which business process modelling and software reuse are employed as primary methods to improve the operability of component-based IERP. The framework consists of five layers including server layer, team work supporting layer, IERP construction and customisation layer, reusable assets and toolset layer, and the IERP system instance layer. These layers as well as their relationship with each other are also discussed.     

虚拟软件在高职计算机网络教学中的应用——以Packet Tracer为例

分析了当前使用物理设备进行计算机网络实践存在的不足,由此提出了利用Packet Tracer虚拟软件构建网络虚拟实验室的必要性。重点介绍了Packet Tracer软件的功能模块和实验方法,并给出三层路由中的实验实例。Packet Tracer软件的应用在提高学生学习兴趣与学习效率上取得了较好的效果。