AI-driven streamlined modeling: experiences and lessons learned from multiple domains

Software and Systems Modeling - Model-driven technologies (MD*), considered beneficial through abstraction and automation, have not enjoyed widespread adoption in the industry. In keeping with the...     

新一代特高压导线悬垂线夹

为向家坝-上海±800kV直流线路设计和试验了新一代特高压导线悬垂线夹--预绞式悬垂线夹。能耗和使用寿命是线路金具的2个关键指标。预绞式悬垂线夹具有节能特点,而且具有独特的结构,能够减小作用在导线上的静态应力(拉应力、压应力和弯曲应力)和动态应力,使得特高压线路的悬垂线夹与导线同寿命。按照全寿命周期来考量,预绞式悬垂线夹具有成本优势。     

rbFeatures: Feature-oriented programming with Ruby

Features are pieces of core functionality of a program that is relevant to particular stakeholders. Features pose dependencies and constraints among each other. These dependencies and constraints describe the possible number of variants of the program: A valid feature configuration generates a specific variant with unique behavior. Feature-Oriented Programming is used to implement features as program units. This paper introduces rbFeatures, a feature-oriented programming language implemented on top of the dynamic programming language Ruby. With rbFeatures, programmers use software product lines, variants, and features as first-class entities. This allows several runtime reflection and modification capabilities, including the extension of the product line with new features and the provision of multiple variants. The paper gives a broad overview to the implementation and application of rbFeatures. We explain how features as first-class entities are designed and implemented, and discuss how the semantics of features are carefully added to Ruby programs. We show two case studies: The expression product line, a common example in feature-oriented programming, and a web application.