Due to the explosive growth in the size of scientific data sets, data-intensive computing and analyzing are an emerging trend in computational science. In these applications, data pre-processing is widely adopted because it can optimize the data layout or format beforehand to facilitate the future data access. On the other hand, current research shows an increasing popularity of MapReduce frame...

the round city of ardeshir khwarah, with its concentric layout, can be considered as the first city which established by the founder of the sasanian dynasty as a symbol of the sasanian royal ideology. ardeshir khwarah plays a key role in establishment of sasanian sovereignty and urban planning. however, a little is known about the history of the city. it seems even stranger if we consider the r...

Sequent calculus is widely used for formalizing proofs. However, due to the proliferation of data, understanding the proofs of even simple mathematical arguments soon becomes impossible. Graphical user interfaces help in this matter, but since they normally utilize Gentzen’s original notation, some of the problems persist. In this paper, we introduce a number of criteria for proof visualization...

We describe an algorithm for radial layout of undirected graphs, in which nodes are constrained to the circumferences of a set of concentric circles around the origin. Such constraints frequently occur in the layout of social or policy networks, when structural centrality is mapped to geometric centrality, or when the primary intention of the layout is the display of the vicinity of a distingui...

The most common graph visualization techniques still use nodelink layouts; where the nodes represent the entities and the links represent the edges or relationships between the entities. In nodelink layouts, the issues of edge density, edge crossings and general edge congestion remain one of the major challenges. In this paper, we introduce a new graph layout: Node-Ring layout. Our layout was i...

A multi-sided hole in a surface can be filled by a sequence of nested, smoothly joined surface rings. We show how to generate such a sequence so that (i) the resulting surface is C2 (also in the limit), (ii) the rings consist of standard splines of moderate degree and (iii) the hole filling closely follows the shape of and replaces a guide surface whose good shape is desirable, but whose repres...

Effective visualization is critical to developing, analyzing, and optimizing distributed systems. We have developed OverView, a tool for online/offline distributed systems visualization, that enables modular layout mechanisms, so that different distributed system high-level programming abstractions such as actors or processes can be visualized in intuitive ways. OverView uses by default a hiera...