Social coding site GitHub provides developers with many management tools to facilitate project maintenance and developer collaboration. Milestone tool, in particular, plays an important role in organizing and tracking progress on groups of issues or pull requests in a project. However, few research has analyzed the milestone tool, even though it has been used in practice for a long time. In this paper, we want to address this literature gap and present an ongoing work aimed at investigating the use of the milestone tool in GitHub open‐source projects. We conduct a mixed‐methods analysis in a large‐scale dataset of GitHub projects, to help developers gain some insights into the milestone tool, including its usage, benefits, and limitations. We quantitatively investigate the basic adoption of milestone tool and its correlation with project properties. We also survey developers to understand the reasons for using milestone tool or not and their perceptions of the milestone tool. We find that certain types of projects use milestone tool more than others. Adopting the milestone tool is associated with more commits, more releases, and more project popularity, but the current milestone tool also has some limitations. These observations can then be forwarded to the GitHub community for follow‐up and can result in them potentially making a better milestone tool.
From the height of system-of-systems combat and operational perspective, the operations of cognitive electronic warfare (CEW) was analysed, and its main process and links were described. Secondly, the jamming effectiveness evaluation (JEE) model of cognitive electronic attack (CEA) operations was established based on the interference side, in which the change of threat degree was used as the measure index of jamming effectiveness. Then, based on the Q-learning model, an intelligent countermeasure strategy generation (ICSG) model was established, and the main steps in the model were given. Finally, on the basis the JEE model and the ICSG model, the simulation experiment was carried out for CEA operations. The result showed that combining the JEE model with the ICSG model can express the main process of the operations of CEW, as well as proved the validity of these models.
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