Advanced Telecommunications and Signal Processing Program

Contains an introduction and reports on twelve research projects.AT&T FellowshipAdvanced Telecommunications Research ProgramINTEL FellowshipU.S. Navy - Office of Naval Research NDSEG Graduate FellowshipMaryland Procurement Office Contract MDA904-93-C-418

Advanced Television Research Program

Contains an introduction and reports on twelve research projects.Advanced Television Research ProgramNational Science Foundation Grant MIP 87-14969National Science Foundation FellowshipKodak Fellowshi

Advanced Television and Signal Processing Program

Contains an introduction and reports on fifteen research projects.Advanced Television Research ProgramAdams-Russell Electronics, Inc.National Science Foundation Fellowship Grant MIP 87-14969National Science Foundation FellowshipU.S. Navy - Office of Naval Research Grant N00014-89-J-1489U.S. Air Force - Electronic Systems Division Contract F1 9628-89-K-004

Bush the transnationalist: a reappraisal of the unilateralist impulse in US foreign policy, 2001-2009

This article challenges the common characterisation of George W. Bush’s foreign policy as “unilateral.” It argues that the Bush administration developed a new post-9/11 understanding of terrorism as a transnational, networked phenomenon shaped by the forces of globalisation. This led to a new strategic emphasis on bi- and multilateral security co-operation and counterterrorism operations, especially outside of Afghanistan and Iraq, driven by the perceived need to counter a transnational security challenge present in multiple locations. This (flawed) attempt to engage with transnational security challenges supplemented the existing internationalist pillar of the Bush administration’s foreign policy. Highlighting the transnational realm of international relations and the ways in which the Bush administration was able to co-opt other states to tackle perceived transnational challenges also shows the high importance the administration attached to concerted action even as it frequented eschewed institutional multilateralism

Reflected Power Measurement of Antennas between 0 and 4 GHz Using Optical Mixing of Distributed Feedback Lasers

Reflected power measurement of antennas by using an alternative microwave photonic system is presented in this paper. The proposed experimental setup is based on optical mixing of two distributed feedback (DFB) lasers, where combined beams are detected by a photo-detector. The resulting photocurrent corresponds to a microwave signal which is continuously tuned on bandwidths from 0 to 4 GHz. The obtained swept frequency is applied to an antenna in order to measure its reflected power. Error sources that limit the measurement accuracy of optical mixing such as effect of power deviation in the linewidth of the beat signal and errors introduced by extra fixture are studied. Results of the measurements obtained with the proposed photonic technique are calibrated and compared with traditional electrical measurements. The most important motivation on the use of the proposed technique in this paper lies in that with a simple configuration we were able to characterize microwave devices in a very wide frequency range, avoiding the use of a vector network analyzer (VNA), and thus, a complicated and tedious calibration procedure, contributing to the field of instrumentation and characterization by using photonic techniques