代码文件贡献组成模式的分析

软件开发过程中,同一代码文件经常由多名开发者共同开发和维护,各个开发者向文件贡献了不同的代码量,使之形成特有的贡献组成.代码文件的贡献组成是否合理,直接影响开发者的任务分配,进而影响软件质量和开发效率.对于不同类型的代码文件,如何刻画并确定其合理的贡献组成模式,成为一个亟待解决的问题.协同开发支撑工具的成熟,使得开发人员的活动可被有效地记录,因此,其所产生的海量数据为数据驱动的智能化软件开发打下了基础.首先,基于代码所有权,从贡献组成的集中度、复杂度和稳定性这3个维度出发,提出刻画贡献组成的3个量度;其次,以OpenStack的核心项目Nova为研究案例,在其版本控制数据上建立贡献组成的量度,总结了12种通用文件类型,归纳出3种贡献组成模式;最后,结合邮件以及面对面访谈的方式,验证了量度的有效性以及贡献组成模式的合理性,并从贡献组成的角度,对软件开发过程给出了一些指导性建议.

Studies on Wetland Biodiversity in China

This paper briefly summarizes the history of wetland research, the evolvement of wetland science, and their impacts on the understanding of wetland biodiversity in China. A marsh is the key type and basic component of a wetland. Defining the marsh and wetland plants is the basis for understanding the wetland and its biodiversity. The comprehensive multiple factorial classification principles and the multiple developmental models of the wetland are two innovative feats achieved by Chinese scientists, and their application has further promoted ecological research. The CAS Wetland Research Center has made historic contributions to the study of the wetland and its biodiversity in China. Also, the paper discusses several important tasks of wetland and biodiversity research.