Defence Research Agency

About: Defence Research Agency is a based out in . It is known for research contribution in the topics: Synthetic aperture radar & Radar. The organization has 1211 authors who have published 1109 publications receiving 31542 citations.

The effect of job demands and social support on peacekeepers’ stress and sense of coherence after deployment

Abstract: This study investigated how experienced demands of the job and the social support during operations were related to psychological well-being after deployment. The data was collected from 817 Finnish peacekeepers returning home between 2012 and 2014 from altogether over 10 different operations of which the most common were ISAF (Afghanistan) and UNIFIL (Lebanon). Experiencing less social support and more job-related demands was related to higher stress and weaker sense of coherence after deployment, even though overall level of emotional difficulties after deployment was low. These results suggest that there may be health gains to achieve in improved social support and balancing job demands during operation. Given the highly hierarchical organization of the military, role of leadership is essential in both establishing social support and balancing the job demands.

A W-band RF-MEMS switched LNA in a 70 nm mHEMT process

Abstract: This work presents a monolithic integrated reconfigurable active circuit consisting of a W-band RF micro-electro-mechanical-systems MEMS Dicke switch network and a wideband low-noise amplifier LNA realized in a 70 nm gallium arsenide GaAs metamorphic high electron mobility transistor process technology. The RF-MEMS LNA has a measured gain of 10.2-15.6 dB and 1.3-8.2 dB at 79-96 GHz when the Dicke switch is switched ON and OFF, respectively. Compared with the three-stage LNA used in this design the measured in-band noise figure NF of MEMS switched LNA is minimum 1.6 dB higher. To the authors' knowledge, the experimental results represent a first time demonstration of a W-band MEMS switched LNA monolithic microwave integrated circuit MMIC in a GaAs foundry process with a minimum NF of 5 dB. The proposed novel integration of such MEMS switched MMICs can enable more cost-effective ways to realize high-performance single-chip mm-wave reconfigurable radiometer front-ends for space and security applications, for example. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:639-646, 2015.

Response of a Brillouin amplifier and four-wave mixing mirror to a spectrally broadened signal beam.

Abstract: We show that, when the input signal to a Brillouin amplifier and a phase-conjugate mirror is spectrally broadened, the Brillouin interaction can still efficiently amplify and conjugate the input.