We describe the two classes of languages recognized by the groups D4 and Q8, respectively. Then we show that the formations of languages generated by these two classes are the same. We also prove that these two formations are closed under inverses of morphisms, which yields a language theoretic proof of the fact that the group formations generated by D4 and Q8, respectively, are two equal varie...

We present a novel approach for locally guiding a group of agents amidst static and dynamic obstacles using the concept of prioritized formations. Our approach plans over a joint formation-velocity space employing a Bayesian scheme for evaluating the priority values of formations and a collision avoidance algorithm that accounts for the anisotropic nature of rotating formations. It guarantees c...

feldspar grains, as a significant provenance indicator, of two terrigenous formations from central iran, the upper red formation, and moghan area, zivah formation, are used for provenance determination and the study of transportation and depositional history. the upper red formation (urf) is volumetrically the most important siliciclastic unit of the central iran and zivah formation (zf) repres...

during some decades ago, iran hosted much more afghan refugees. different researches, content analyses of speeches, legislatives interviews and different social news show that negative emotions toward afghans exist among some part of people and legislatives, so that they recognize afghans as criminals. therefore, the purpose of this study was social construction of these negative emotions forma...

The upper part of Shirgesht (UPS) and lower part of Niur (LPN) formations (Ordovician-Silurian) consist of sandstone, shale and limestone, respectively. The petrography and geochemical analysis conducted to evaluate provenance of siliciclastic deposits in order to understand the paleogeography of Central Iran during the Early Paleozoic time. This study shows that quartz and K-feldspar are the m...

We report a case of a 6-year-old girl presented with diffuse scalp and body hair loss and developed multiple groups of follicular papules on the trunk. She was diagnosed as follicular mucinosis co-existed with alopecia universalis. Histopathological study supported the diagnosis and did not find malignancy cells.

Biological multi-agent systems such as animal herds, insect colonies and fish schools provide a lot of insight into the study and design of artificial multi-agent systems such as teams of autonomous mobile robots. Similarly, a lot can be learned about biological systems by borrowing design and analysis tools from multi-agent robotics. In this paper some recent work in the area of multi-agent ro...