Understanding developer and manager perceptions of function points and source lines of code

Although function points (FP) are considered superior to source lines of code (SLOC) for estimating software size and monitoring developer productivity, practitioners still commonly use SLOC. One reason for this is that individuals who fill different roles on a development team, such as managers and developers, may perceive the benefits of FP differently. We conducted a survey to determine whether a perception gap exists between managers and developers for FP and SLOC across several desirable properties of software measures. Results suggest managers and developers perceive the benefits of FP differently and indicate that developers better understand the benefits of using FP than managers.     

频域单源区间和欠定的盲信号分离

探讨在感知器个数少于源信号个数时的盲分离问题,提出频域中的单源区间矩阵恢复方法,以实现时域检索平均法在频域中的扩展,与传统的聚类算法相比,该算法计算简单、精度高,在理论上能够无偏差地估计混叠矩阵。在源信号的恢复上,根据稀疏的原则,在仅m个源在频域中较大、其余源可近似为0的假设下,得出求解L1范数的简化方法。语音信号仿真实验展示了该方法的性能和实用性。     

基于层次管理的按需路由协议研究

动态源路由（DSR）协议能较好适用中小型对等自组网络环境,但在非对等网络环境中面临一定应用局限。针对该问题,分析DSR协议的特点和存在问题,结合非对等环境和层次路由思想,提出新的协议CDSR,对CDSR路由协议进行性能评估。仿真结果表明,该协议具有较好的执行效能,可提升网络性能。     

多维度的安卓应用相似度分析

基于安卓的智能设备的普及和移动互联网的发展带来了安卓应用的繁荣,但同时也带来了移动应用的开发、维护、安全等方面的问题。采取了多种技术,提取了安卓应用的功能描述、权限声明及源代码,并基于这些信息对1173个安卓应用进行了统计分析、相似度计算、聚类以及交叉对比;利用多个维度的安卓应用特征相似度分析,初步得到了安卓应用多个维度的相关规律,其可辅助不同的安卓应用的开发和管理任务,如权限过度声明检测、重打包检测、应用描述完善、领域内的公共类库的发现和提取等,从而帮助改善安卓市场的生态并提高安卓应用的开发效率。     

一种基于复数域网络编码的双层卫星通信系统

针对卫星通信网络吞吐量不足、可靠性不高的问题,提出一种基于复数域网络编码(Complex Field Network Coding,CFNC)的卫星通信方案。该方案在信号发送前对源信息作预编码处理,即在复数域上选取一个大小合适的参数化空时码与源信号相乘,编码后的信号与源信号在复数域上有着一一映射关系。对该方案的吞吐量和成对差错概率(Pairwise Error Probability,PEP)做了详尽的理论分析,结果表明,采用该编码方案的卫星通信系统在终端发射功率不变的情况下,吞吐量比路由模式提高了100%以上,比传统的CFNC方式至少可提高75%。该方案还可以扩展至更多的地面源节点,从而支持多用户网络通信。最后,仿真实验表明,在较高的信噪比下,PEP仿真值逼近于渐近值,验证了理论分析的正确性。     

火焰温度场测试中的传感器动态特性补偿

在进行爆温测试时,爆炸伴随的高温火焰具有变化快、温度高、测试环境恶劣等特点.针对这种特定的测温场合,运用火焰温度源法研究了热电偶传感器在火焰温度场中的动态响应特性.为了减小热电偶的动态测量误差,通过粒子群优化算法(PSO)建立了测试系统的动态补偿滤波器模型.实验表明,这种研究方法有效地改善了热电偶的动态测量误差,对通过爆温测试进行弹丸热毁伤评价有一定的参考价值.     

Firms’ involvement in Open Source projects: A trade-off between software structural quality and popularity

Open Source (OS) was born as a pragmatic alternative to the ideology of Free Software and it is now increasingly seen by companies as a new approach to developing and making business upon software. Whereas the role of firms is clear for commercial OS projects, it still needs investigation for projects based on communities. This paper analyses the impact of firms’ participation on popularity and internal software design quality for 643 SourceForge.net projects. Results show that firms’ involvement improves the ranking of OS projects, but, on the other hand, puts corporate constraints to OS developing practices, thus leading to lower structural software design quality.     

Adoption of Open Source Software: The role of social identification

While the benefits of incorporating Open Source Software (OSS) into personal and organizational systems have been widely touted, OSS must be adopted and used by end users before these benefits can be realized. Drawing on research in information systems and sociology, this study develops and evaluates an integrated model for the acceptance of OSS. In addition to the traditional technology adoption variables the findings stress the importance of social identification as a key driver of OSS adoption. The proposed model provides a useful decision support tool for assessing and proactively designing interventions targeted at successful OSS adoption and diffusion.     

一种面向微博用户的标签推荐方法

首先对国内微博平台的信息进行了综合分析,主要介绍了微博信息的定义,在错综复杂的微博信息中哪些信息比较重要,以及这些微博信息包含哪些详细的内容,是如何组织的。然后选取新浪微博平台作为研究对象,利用新浪微博API设计了爬虫程序,抽取用户信息;以用户的关注人数、粉丝数和发布的微博数为标准对用户信息进行了定量分析。最后根据分析结果,针对不同特征的用户群体提出了相应的标签推荐方法。     

一种面向微博用户的标签推荐方法

首先对国内微博平台的信息进行了综合分析,主要介绍了微博信息的定义,在错综复杂的微博信息中哪些信息比较重要,以及这些微博信息包含哪些详细的内容,是如何组织的。然后选取新浪微博平台作为研究对象,利用新浪微博API设计了爬虫程序,抽取用户信息;以用户的关注人数、粉丝数和发布的微博数为标准对用户信息进行了定量分析。最后根据分析结果,针对不同特征的用户群体提出了相应的标签推荐方法。