The use of geometric patterns in art has a long history. The geometric period of ancient Greek art (ca. 900–700BC) is characterized by the extensive use of geometric motifs, mainly on vase and amphorae painting. These decorative motifs (meanders, triangles, circles, etc.) extend horizontally in multiple bands about the vase circumference, and they exhibit central and translational symmetry [7, ...

swastika designs applied for ornamenting in many different arts before islamic period. these designs have important role in architecture ornaments at islamic period. in this paper we study concepts, aesthetic and evolution of these designs in islamic period architecture ornaments from beginning to end of zand and ghajar era. the thoughtful artists of islamic periods comprehended from the beginn...

Algorithms for geometric and chemical comparison of protein substructure can be useful for many applications in protein function prediction. These motif matching algorithms identify matches of geometric and chemical similarity between well-studied functional sites, motifs, and substructures of functionally uncharacterized proteins, targets. For the purpose of function prediction, the accuracy o...

In this paper 1 we present a method for discovering approximately common motifs (also known as active motifs) in three dimensional (3D) molecules. Each node in a molecule is represented by a 3D point in the Euclidean Space and each edge is represented by an undirected line segment connecting two nodes in the molecule. Motifs are rigid substructures which may occur in a molecule after allowing f...

the subject of geometry and proportions has been regarded as an issue which has a close relationship with architecture. since the entire universe, living beings and the human geometry can be seen clearly, that’s why our unconscious essence has accustomed to these proportions whereby reflection of this mentality can be seen in the architect’s hands and thought in the architecture. it can witness...

in islamic architecture, the architect always tried to decorate the internal and external areas in different ways. one type of these decorations is called brick working, which was current in pre-ilkhanid, ilkhanid period, and after this period. this decoration was used in two ways. in ilkhanid period, the architect used a type of brick which was exactly formed in favorite shapes before baking. ...

The development of new and effective drugs is strongly affected by the need to identify drug targets and to reduce side effects. Unfortunately, resolving these issues depends partially on a broad and thorough understanding of the biological function of many proteins, and the experimental determination of protein function is expensive and time consuming. In response to this problem, algorithms f...

For a large class of proteins called sandwich-like proteins (SPs), the secondary structures consist of two beta-sheets packed face-to-face, with each beta-sheet consisting typically of three to five beta-strands. An important step in the prediction of the three-dimensional structure of a SP is the prediction of its supersecondary structure, namely the prediction of the arrangement of the beta-s...