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This paper is an attempt to develop a posture control strategy for quadruped robot. Here, a concept of posture control is proposed, in which, a revolute and prismatic (RP) manipulator with payload at the end is used to control the body orientation. For the said analysis necessary model is developed in the bond graph and efficacy of the proposed strategies is validated through simulation results of...
In order to understand the change rule and its mechanism for the space charge property of Magnesium oxide (MgO)/ LDPE nanocomposites after damp, the moisture absorption weight and space charge properties of wet LDPE and MgO/LDPE were studied. Experiments results show that moisture absorption has a strong influence on dielectric properties of MgO/LDPE nanocomposite. After nanocomposite had been exposed...
Perpendicular epitaxial film of L10 FePt, showing the c-axis normal to the film plane, was successfully grown on top of MgO substrate using DC-magnetron co-sputtering technique. The electron holography study showed that a columnar epitaxial film displayed only a weak stray-field signal due to the presence of columnar boundaries. The growth of a continuous (full) epitaxial film however revealed characteristic...
Strain engineering of thin epitaxial Si thin films on insulating oxide buffers is of special interest to boost charge carrier mobility for SOI technologies. The single crystalline Si(111)/Y2O3(111)/Pr2O3(111)/Si(111) heterostructure offers, in principle, the opportunity to grow strain-engineered epitaxial Si(111) layers, realizing compressed, fully relaxed, as well as tensile-strained Si films. The...
Proposed here is a novel architecture for a fault-tolerant real-time system. We employ a checkpoint rollback strategy with double modular redundancy. Main consideration is given to how to recover from both transient and permanent faults without any built-in fault-detection modules or spare processors. Besides state comparison between duplicated tasks, the system has access to the state of the previous...
An optimal checkpoint strategy for fault-tolerance in real-time systems is addressed in this paper. We consider multiple real-time tasks with arbitrary periods that are scheduled by Rate Monotonic (RM) algorithm. Equidistant checkpointing is maintained for each kind of task, while the width of checkpoint intervals is different with respect to the task. We propose a method to determine the optimal...
This paper describes the implementation of a fully integrated antenna front-end that leverages Northrop Grumman Space Technology's (NGST's) novel wafer level packaging technique to marry the optimal technology per function through the bonding of III-V wafers. To demonstrate the proposed approach, a 4-element Q-band linear array has been assembled and tested to validate the concept.
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