Search results for "Tuple"
showing 3 items of 23 documents
Step-along power vector method for astigmatic wavefront propagation
2013
Purpose To propose both a new algebraic solution and a graphical monitoring method for astigmatic wavefront propagation in the framework provided by power vectors. Methods The generalised propagation equation describing the propagation of astigmatic wavefronts from one plane to another is adapted to the power vectors formalism using a novel algorithm based on a step-along method. The step-along procedure is directly applied to the tuple of power vectors [M, J0, J45] representing an arbitrary astigmatic wavefront and it permits the calculation of the tuple of power vectors [M′, J′0, J′45] after a given propagation distance. This is achieved mathematically first by temporarily rotating the as…
Which regions produce the most innovation policy research?
2022
[EN] This article uses the data indexed in the Web of Science Core Collection and Scopus databases up to and including the year 2020 to map leading regions and trending topics in academic innovation policy research. The country analysis highlights four leading regions in this research field: Western Europe (led by the UK, the Netherlands, Germany, and Spain), North America (led by the USA), Scandinavia (led by Sweden and Denmark), and Asia-Pacific (led by China and Australia). The most common keywords are used to develop a conceptual framework. Applying the Tree of Science approach, we classify the most influential studies into three categories: foundational studies (the roots), structural …
A Web-Based Coordination Infrastructure for Grid Collective Services
2004
Virtual Organizations (VO) consisting of heterogeneous institutions and individuals that share resources dynamically and in a coordinated way to support collaborative problem-solving are emerging in many fields. Consequently, new types of distributed infrastructures known as Grids have been proposed to cope with these new sharing requirements. Grids offer sets of collective services to support collaborative tasks which are distributed in nature and need asynchronous communication. Existing approaches to this problem lack of flexibility, adaptability and are tightly bound to the collective service that is provided. We present here a generic event model to build collective services that requi…