Abstract:Package managers are legion. Every programming language and operating system has its own solution, each with subtly different semantics for dependency resolution. This fragmentation prevents multilingual projects from expressing precise dependencies across language ecosystems; it leaves external system and hardware dependencies implicit and unversioned; it obscures security vulnerabilities that lie in the full dependency graph. We present the \textit{Package Calculus}, a formalism for dependency resolution that unifies the core semantics of diverse package managers. Through a series of formal reductions, we show how this core is expressive enough to model the diversity that real-world package managers employ in their dependency expression languages. By using the Package Calculus as the intermediate representation of dependencies, we enable translation between distinct package managers and resolution across ecosystems.
北京大学工学院教授喻俊志表示，这项技术的核心创新在于：一是通过电子束预先“编程”材料内部的溶胀差异，让图案在溶剂环境变化中可控显示与隐藏；二是采用双层结构设计，实现了“形变”与“变色”的独立调控。喻俊志认为，“这种受头足类动物启发的表面动态调控新方法，不仅为智能材料设计提供了新思路，还为仿生机器人的外观自适应与伪装技术开辟了新途径。”
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They are unwilling to speak openly about their former workplace because of non-disclosure agreements and active careers in the tech industry.。heLLoword翻译官方下载对此有专业解读