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Motivated by understanding the ESD-induced currents from body-worn, wire and hose connected medical equipment is exposed to, a computer simulation is presented to estimate the impedance of a human body relative to ground. This 3D model is the basis for transient field calculation. A Method of Moments (MoM) frequency domain solution is transformed into time domain via IFFT for further circuit level...
For a PET insert to be placed inside an MR system, shielding for the detector modules is crucial as otherwise there can be mutual interference between the two modalities. In this work, we have assessed various shielding designs for both RF shielding effectiveness and gradient-induced eddy current performances. We designed six shielding configurations with various thicknesses, patterns and materials:...
Organisational culture change is a long and complex process that typically takes years to complete and has a very low success rate. This project addresses the problem by the proposed use of an Action Design Research Methodology to build and deploy an IT artifact named Organisational Culture Assessment Instrument-Spilter (OCAI-Spilter) to speed up cultural change while reducing failure rate. OCAI-Spilter...
Tension measurement of tendon employed in PreStressed Concrete(PSC) bridge is very important for the bridge safety check. For the measurement of tensile stress of the tendon, many different methods such as acoustics, fiber optics, and electro-magnetics are employed[1,2]. In this work, to measure tensile stress by mean of magnetic method, we have constructed a measuring system as shown in Fig 1. Ac...
Spin Transfer Torque Magnetic Random Access Memory (MRAM) possesses a unique combination of high speed, high endurance, non-volatility, and small cell size. Among the emerging new memory technologies, including phase change memory, resistive random access memory, and conductive bridging random access memory, Spin Transfer Torque MRAM is the only candidate with the potential for unlimited endurance,...
The control performances of the hybrid PWM inverter according to the phase current measuring method is presented in this paper. The hybrid PWM strategy consists of space vector pulse width modulation (SVPWM) and 6-step modulation. SVPWM is performed to reduce the harmonic components in the low speed region, and 6-step modulation is applied to increase the maximum speed of the IPMSM in the high speed...
This paper describes the investigation of the influence of harmonics in a signal that is measured by using an AC quantum voltmeter. Equations for parameters of the signal being measured, such as amplitude of the fundamental frequency that depends on the sampling frequency and harmonics are presented.
In this paper, a power management system (PMS) for direct methanol fuel cell (DMFC) is proposed. The proposed PMS consists of interfaces for external devices, a controller, a DC/DC converter, a display, relay switches and current sensors. The power management algorithm is based on the experimentally obtained characteristics of a DMFC module. The proposed power management algorithm increased the running...
A Voltage Calibrator based on a 10-V programmable Josephson Array that is simple to use, provides DC and AC calibration up to kHz range for industry-common equipment, and ensures direct traceability to a quantum-based standard, is under development. This device has proven to excel conventional DC standard systems and will extend into low frequency AC range, thereby making itself a practical and robust...
We investigate the sub-20nm level scalability of STT-MRAM cells possessing perpendicular magnetization induced from the interface of free layer (FL) and MgO tunnel barrier. We demonstrate that the MTJs utilizing dual interfaces of FL and MgO exhibit enhanced scalability with high thermal stability and low switching current, compared with the MTJs with a single interface. As thermal stability factor...
Gate oxide and interface trap charges are critical parameters for device reliability and their generation and recovery are investigated under AC and DC oxide field stress on n-channel MOSFETs by C-V, I-V, and CP measurements. The interface traps generation is the same under both DC and AC stress but oxide charge trap generation is higher at AC stress than DC stress. The oxide charge and interface...
A single line to ground fault (SLG) detection in ungrounded network is very difficult, because fault current magnitude is very small. It is generated by a charging current between distribution line and ground. As it is very small, is not used for fault detection in case of SLG. So, SLG has normally been detected by switching sequence method which makes customers experience blackouts. A new fault detection...
In this paper, we propose dynamic spectrum sharing methods for femto base stations (BSs) operated within a macro BS's spectrum area. As the spectrum sharing methods, we provide traffic pattern based resource hopping schemes of the femto BSs. Traffic pattern information which reflects channel activities for each subband used by the macro BS is utilized by the femto BSs to select proper resources. We...
The high frequency drain current noise in nanoscale MOSFETs is carefully measured and compared with the shot and the thermal noise levels in all operating regions. For the first time, the shot noise characteristics are observed in the strong inversion region around-10 nm MOSFETs.
Maximizing In composition in the channel structures of high-electron-mobility transistors on InP is one important aspect of achieving devices capable of operating beyond 300 GHz. In this article, we compare dc and rf performance results from two variations of one such device design, incorporating a composite-channel structure comprised of InAs clad by InP-lattice-matched InGaAs. The only difference...
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