In the recent landmark paper of Zheng and Tse it is shown that there exists a fundamental tradeoff between diversity gain and multiplexing gain, referred to as the DiversityMultiplexing gain(D-MG) tradeoff. The present paper presents the first explicit construction of space-time (ST) codes for arbitrary number of transmit antennas that achieve the D-MG tradeoff. It is shown here that ST codes w...

One of the most robust qualities of our visual world is the scale invariance of natural images. Not only has scaling been found in different visual environments, but the phenomenon also appears to be calibration-independent. This paper proposes a simple property of natural images which explains this robustness: they are collages of regions corresponding to statistically independent "objects". E...

1 Center for Image Processing and Integrated Computing (CIPIC), Department of Computer Science, University of California, Davis, One Shields Avenue, Davis, CA 95616–8562, USA 2 Applied Numerical Algorithms Group, National Energy Research and Scientific Computing Center (NERSC), Ernest Orlando Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA 3 Visualization Grou...

BACKGROUND AND PURPOSE Alberta Stroke Programme Early CT Score (ASPECTS) is widely used for assessment of early ischemic changes in acute stroke. We hypothesized that CT angiography source image (CTA-SI) ASPECTS correlates better with baseline National Institutes of Health Stroke Scale score, final ASPECTS and neurological outcomes when compared with noncontrast CT ASPECTS. METHODS We studied...

one of the most important tekyes in iran and one of the most important islamic buildings in kermanshah province is the mo’aven-ol molk tekyeh. this building is located in historical context (barzeh damagh district) and related to the late qajar period. based on the present situation, the space of this tekye has been formed of four parts: courtyard entrance, hoseiniyeh, zainabiyeh and abbasiyeh....

geopolitical imagination, by definition, is the competition between powers in forming individuals’, institutions’ and political factors’ perception of the characteristics and contents of geographical space, on the basis of their intended interests. in this article, as a case study, the us perception of the :union: of soviet socialist republics during the cold war era is analysed. the authors ar...

This article examines the composition of city image Xi'an and effectiveness media communication. First, research defines positioning Xi'an's clarifies purpose After that, first-hand information is collected through a questionnaire survey in order to gain insight into audiences' perceptions analyze its communicating public. Essentially, reflection overall evaluation comprehensive competitiveness...