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Sudha Rani. S.V,B. Ramadoss 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.7
An Unmanned Air Vehicle (UAV) is a collection of functionalities and capabilities required to execute complex missions, with the combination of ground systems (comprising of vehicle and payload control) on ground and Avionics Systems (along with various payloads) on board. The UAV executes various missions using a combination of payloads and their ground control. The mission-based evaluation of the UAV is a challenging task in terms of achieving sufficient test adequacy in generating effective test cases for accomplishment of complex mission roles. The timeliness performance, which is a combination of event-triggered and time-triggered execution of tasks, is the most important category to evaluate an Integrated System’s Mission based performance, in addition to the correctness and consistency of data transactions among the various systems. This paper proposes a framework for an exhaustive mission-based evaluation of timeliness of integrated Avionics Systems of the UAV. The authors introduce various functional mutation operators for achievement of adequate test adequacy for this timeliness performance evaluation.
Hexagonally ordered high density cobalt nanowires using diblock copolymer templates
V. Sudha Rani,CheolGi Kim,C.O. Kim,S.S. Yoon,B. Parvatheeswara Rao 한국자기학회 2006 한국자기학회 학술연구발표회 논문개요집 Vol.- No.-
Electrodeposited Co nanowires were grown on self assembled diblock copolymer nanoporous templates. While keeping the template pore size and electrolyte pH value constant at 13.7 ㎚ and 3.82, respectively, the DC current density (5 ㎃/㎝2 and 50 ㎃/㎝2) and time of deposition (50s, 100s, 150s and 200s) were varied to obtain nanowires of varied aspect ratios and morphologies. It was observed that the time of electrodeposition, height of the nanowirelinearly enhances. SEM images of the samples indicate that the template pores were completely filled during deposition for current density of 50㎃/㎝2. Excess times of deposition produced a thin layer of the deposited material on top of the porous template. Magnetic hysteresis properties of the generated nanowires were examined by vibration sample magnetometry. The loops displayed are highly square with coercivities of few tens of oersteds. The magnetization of the Co nanowires enhances as the height of the wires increases. The results were analyzed to understand the influence of current density on the growth of nanowires.
Structural and magnetic properties of electrodeposited cobalt nanowires in polycarbonate membrane
Rani, V. Sudha,Anandakumar, S.,Lee, Hojun,Bang, Wonbae,Hong, Kimin,Yoon, S. S.,Jeong, J.-R.,Kim, CheolGi WILEY-VCH Verlag 2009 Physica status solidi. PSS. A, Applications and ma Vol.206 No.4
<P>We analyzed the structural and magnetic properties of an array of electrodeposited cobalt nanowires grown in polycarbonate membrane with pore size 50 nm diameter and thickness ≤6 μm. The current-time profiles were recorded during the deposition, in order to estimate and understand the growth rate and mechanism of the cobalt nanowires respectively. The formation of single and multi-domains in the nanowires was explained by using simple domain model assumptions. The X-ray diffraction patterns show that the cobalt nanowires were grown in a mixture of fcc and hcp phases. The magnetic properties of the deposited nanowires show that the preferential magnetization orientation close to the perpendicular direction of the nanowire axis. The structural properties of the nanowires were observed by Scanning Electron Microscope (SEM). The magnetic properties were analyzed by Vibrating Sample Magnetometer (VSM) at room temperature. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>